US20150352629A1 - Forging device and forging method - Google Patents
Forging device and forging method Download PDFInfo
- Publication number
- US20150352629A1 US20150352629A1 US14/764,699 US201314764699A US2015352629A1 US 20150352629 A1 US20150352629 A1 US 20150352629A1 US 201314764699 A US201314764699 A US 201314764699A US 2015352629 A1 US2015352629 A1 US 2015352629A1
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- workpiece
- shaping roller
- axis
- central
- peripheral surface
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/14—Spinning
- B21D22/16—Spinning over shaping mandrels or formers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/26—Making other particular articles wheels or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K21/00—Making hollow articles not covered by a single preceding sub-group
- B21K21/16—Remodelling hollow bodies with respect to the shape of the cross-section
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K23/00—Making other articles
- B21K23/04—Making other articles flanged articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/02—Making articles shaped as bodies of revolution discs; disc wheels
Definitions
- the present invention relates to a forging device and a forging method each of which performs molding such that a shaping roller is pressed against a workpiece so as to expand the workpiece in a radial direction and a central-axis direction of the workpiece.
- Patent Document 1 describes a forging method for performing diameter expansion molding to expand a cylindrical metal workpiece in a radial direction of the workpiece.
- the workpiece is rotated around a central axis of the workpiece, and a cylindrical shaping roller is pressed against that end surface of the workpiece thus rotated which is on one side in a central-axis direction of the workpiece.
- the shaping roller makes contact with the workpiece as such, and then, the shaping roller is moved down with the shaping roller being rotated with the workpiece.
- a pressure is applied to the workpiece from the shaping roller, so that the workpiece can be expanded in the radial direction.
- Patent Document 1 Japanese Patent Application Publication No. 2011-224605 (JP 2011-224605 A)
- an object of the present invention is to provide a forging device and a forging method each of which can manufacture a forging having a boss portion while achieving reduction in cost.
- One aspect of the present invention to solve the above problems is characterized in that: in a forging device including a rotating table that rotates around a rotation axis, and a cylindrical shaping roller, the forging device forging a cylindrical workpiece such that an outer peripheral surface of the shaping roller is pressed against an end surface of the workpiece in a central-axis direction of the workpiece while the workpiece is rotated by the rotating table around a central axis of the workpiece, the shaping roller is placed apart from the rotation axis, and a position of that end of the outer peripheral surface of the shaping roller which is opposite to a rotation-axis side in a central-axis direction of the shaping roller is placed at an outer side in a radial direction of the workpiece relative to a position of an outer peripheral surface of the workpiece that has been forged.
- the above aspect it is possible to perform diameter expansion molding to expand the cylindrical workpiece in the radial direction such that the outer peripheral surface of the shaping roller is pressed against the end surface of the workpiece in the central-axis direction of the workpiece while the workpiece is rotated by the rotating table around the central axis of the workpiece. Further, since the shaping roller is placed apart from the rotation axis of the rotating table, a material of the workpiece flows toward the rotation-axis side relative to the shaping roller, so that boss molding to form a boss portion formed by raising a central part of the workpiece in the central-axis direction of the workpiece can be performed. Thus, the diameter expansion molding and the boss molding can be performed at the same time. This makes it possible to manufacture a forging having the boss portion while achieving reduction in cost.
- the position of that end of the outer peripheral surface of the shaping roller which is opposite to the rotation-axis side in the central-axis direction of the shaping roller is placed at the outer side in the radial direction of the workpiece relative to the position of the outer peripheral surface of the workpiece that has been forged.
- This causes such a state where the outer peripheral surface of the shaping roller is pressed against a large area of the end surface of the workpiece in the central-axis direction of the workpiece, during the forging of the workpiece.
- This makes it possible to secure accuracy of the end surface of the workpiece that has been forged, by the outer peripheral surface of the shaping roller. This can accordingly improve the accuracy of the end surface of the workpiece that has been forged.
- the forging device include a cylindrical mandrel; a central axis of the mandrel accord with the rotation axis; the shaping roller have an inner end surface placed at the rotation-axis side in the central-axis direction of the shaping roller; and a distance between the central axis of the mandrel and the inner end surface be larger than a radius of the mandrel but smaller than a radius of the workpiece.
- the boss portion having a hollow cylindrical shape in the central part of the workpiece. Since the material of the workpiece flows while making close contact with the outer peripheral surface of the mandrel, it is possible to secure desired accuracy in an inner peripheral surface of the boss portion by managing accuracy of the outer peripheral surface of the mandrel.
- the forging device include two shaping rollers.
- a central axis of the shaping roller be generally perpendicular to the rotation axis.
- the two shaping rollers can be integrated with each other by one shaft member while central axes of the two shaping rollers accord with each other. This makes it possible to simplify the mechanism for supporting the two shaping rollers.
- Another aspect of the present invention to solve the above problems is characterized in that: in a forging method for forging a cylindrical workpiece, by use of a rotating table that rotates around a rotation axis, and a cylindrical shaping roller, such that an outer peripheral surface of the shaping roller is pressed against an end surface of the workpiece in a central-axis direction of the workpiece while the workpiece is rotated by the rotating table around a central axis of the workpiece, the shaping roller is placed apart from the rotation axis, and a position of that end of the outer peripheral surface of the shaping roller which is opposite to a rotation-axis side in the central-axis direction of the shaping roller is placed at an outer side in a radial direction of the workpiece relative to a position of an outer peripheral surface of the workpiece that has been forged.
- the above aspect it is possible to perform diameter expansion molding to expand the cylindrical workpiece in the radial direction such that the outer peripheral surface of the shaping roller is pressed against the end surface of the workpiece in the central-axis direction of the workpiece while the workpiece is rotated by the rotating table around the central axis of the workpiece. Further, since the shaping roller is placed apart from the rotation axis of the rotating table, a material of the workpiece flows toward the rotation-axis side relative to the shaping roller, so that boss molding to form a boss portion formed by raising a central part of the workpiece in the central-axis direction of the workpiece can be performed. Thus, the diameter expansion molding and the boss molding can be performed at the same time. This makes it possible to manufacture a forging having the boss portion while achieving reduction in cost.
- the position of that end of the outer peripheral surface of the shaping roller which is opposite to the rotation-axis side in the central-axis direction of the shaping roller is placed at the outer side in the radial direction of the workpiece relative to the position of the outer peripheral surface of the workpiece that has been forged.
- This causes such a state where the outer peripheral surface of the shaping roller is pressed against a large area of the end surface of the workpiece in the central-axis direction of the workpiece, during the forging of the workpiece.
- This makes it possible to secure accuracy of the end surface of the workpiece that has been forged, by the outer peripheral surface of the shaping roller. This can accordingly improve the accuracy of the end surface of the workpiece that has been forged.
- a cylindrical mandrel be used; a central axis of the mandrel accord with the rotation axis; the shaping roller have an inner end surface placed at the rotation-axis side in the central-axis direction of the shaping roller; and a distance between the central axis of the mandrel and the inner end surface be larger than a radius of the mandrel but smaller than a radius of the workpiece.
- the boss portion having a hollow cylindrical shape in the central part of the workpiece. Since the material of the workpiece flows while making close contact with the outer peripheral surface of the mandrel, it is possible to secure desired accuracy in an inner peripheral surface of the boss portion by managing accuracy of the outer peripheral surface of the mandrel.
- a central axis of the shaping roller be generally perpendicular to the rotation axis.
- the two shaping rollers can be integrated with each other by one shaft member while central axes of the two shaping rollers accord with each other. This makes it possible to simplify the mechanism for supporting the two shaping rollers.
- the forging device and the forging method of the present invention it is possible to manufacture a forging having a boss portion while achieving reduction in cost.
- FIG. 1 is a sectional view illustrating a schematic configuration of a forging device of the present embodiment, and illustrates a state before forging is performed on a workpiece.
- FIG. 2 is a sectional view illustrating the schematic configuration of the forging device of the present embodiment, and illustrates a state after the forging is performed on the workpiece.
- FIG. 3 is a view to describe a principle to perform diameter expansion molding and boss molding on the workpiece.
- FIG. 4 is a sectional view taken along a line A-A in FIG. 3 .
- FIG. 5 is a view to describe a conventional technique.
- FIG. 6 is a sectional view illustrating a schematic configuration of a forging device of a modification.
- FIG. 7 is a sectional view illustrating a schematic configuration of a forging device of a modification.
- FIG. 8 is a sectional view illustrating a schematic configuration of a forging device of a modification.
- FIG. 9 is a top view of a mandrel in the forging device of the modification illustrated in FIG. 8 .
- FIG. 10 is a sectional view illustrating a schematic configuration of a forging device of a modification.
- FIG. 11 is a sectional view illustrating a schematic configuration of a forging device of a modification.
- FIGS. 1 and 2 are each a sectional view illustrating a schematic configuration of the forging device 1 of the present embodiment.
- FIG. 1 illustrates a state before forging is performed on a workpiece W
- FIG. 2 illustrates a state after the forging is performed on the workpiece W.
- the forging device 1 includes a rotating table 10 , a mandrel 12 , a shaping roller 14 , roller moving means (not shown), and so on.
- the rotating table 10 rotates around a rotation axis L 1 . Further, the rotating table 10 rotates the workpiece W placed on a surface 10 a , around a central axis of the workpiece W.
- the mandrel 12 is formed in a cylindrical shape.
- the mandrel 12 is placed on the surface 10 a of the rotating table 10 so that a central axis of the mandrel 12 accords with the rotation axis L 1 of the rotating table 10 .
- the mandrel 12 is inserted inside an inner peripheral surface Wa of the workpiece W, and the workpiece W is placed on the surface 10 a of the rotating table 10 with an outer peripheral surface 12 a of the mandrel 12 making contact with the inner peripheral surface Wa of the workpiece W. This allows the central axis of the workpiece W to accord with the rotation axis L 1 and the central axis of the mandrel 12 .
- the shaping roller 14 is formed in a cylindrical shape. Further, the shaping roller 14 includes an outer peripheral surface 14 a , an inner end surface 14 b , and so on.
- the inner end surface 14 b is an end surface on a rotation-axis-L 1 side in a central-axis-L 2 direction of the shaping roller 14 .
- two shaping rollers 14 are provided.
- the two shaping rollers 14 are placed at respective positions whose phases are shifted by 180° to each other in a rotation direction of the rotating table 10 .
- the two shaping rollers 14 are integrated with each other by a shaft 20 in such a state where their central axes L 2 accord with each other.
- the shaft 20 is attached to a housing 22 in a rotatable state. Because of this, the two shaping rollers 14 integrated with each other by the shaft 20 rotate integrally around the central axes L 2 of the shaping rollers 14 .
- the shaping roller 14 is placed apart from the rotation axis L 1 . That is, a gap is provided between the rotation axis L 1 and the inner end surface 14 b of the shaping roller 14 (more specifically, an intersection of the inner end surface 14 b with the central axis L 2 ).
- a distance ⁇ 0 between the rotation axis L 1 and the inner end surface 14 b is larger than a radius r of the mandrel 12 , but smaller than a radius R 0 of the workpiece W.
- the central axis L 2 of the shaping roller 14 is generally perpendicular to the rotation axis L 1 . More specifically, the central axis L 2 intersects with the rotation axis L 1 at an angle of 90° ⁇ 10° (that is, 80° to 100°), for example.
- materials of the rotating table 10 , the mandrel 12 , and the shaping roller 14 may be cold working tool steel (SKD11, SKH), cemented carbide, and the like, for example.
- the outer peripheral surface 14 a of the shaping roller 14 is a part that makes contact with the workpiece W, which will be described later. On this account, it is desirable that coating be performed on the outer peripheral surface 14 a of the shaping roller 14 so as to maintain a surface state.
- roller moving means is attached to the housing 22 .
- the roller moving means moves the housing 22 in parallel along a rotation-axis-L 1 direction of the rotating table 10 , so as to move the two shaping rollers 14 in parallel to the rotation axis L 1 .
- the roller moving means is a ball screw, a hydraulic mechanism, or the like, for example.
- the forging device 1 includes a controlling portion (not shown).
- the controlling portion is constituted by a microcomputer, for example, and controls driving of the rotating table 10 , the roller moving means, and so on.
- the workpiece W having a hollow cylindrical shape is placed on the surface 10 a of the rotating table 10 .
- the mandrel 12 is inserted inside the inner peripheral surface Wa of the workpiece W so that the central axis of the workpiece W accords with the rotation axis L 1 of the rotating table 10 .
- a height H (a length in the rotation-axis-L 1 direction) of the mandrel 12 is larger than a height h (a length in the rotation-axis-L 1 direction) of the workpiece W.
- the rotating table 10 and the mandrel 12 are rotated around the rotation axis L 1 (the central axis of the mandrel 12 , the central axis of the workpiece W).
- the workpiece W is rotated around the rotation axis L 1 .
- the shaping roller 14 is moved toward the workpiece W by the roller moving means. Then, the outer peripheral surface 14 a of the shaping roller 14 is pressed against an end surface Wb of the workpiece W (an end surface thereof at a shaping-roller- 14 side in the central-axis direction of the workpiece W), so that the shaping roller 14 makes contact with the workpiece W.
- the workpiece W is being rotated around the rotation axis L 1 . Because of this, when the shaping roller 14 makes contact with the workpiece W as described above, the shaping roller 14 rotates following the workpiece W. That is, the shaping roller 14 rotates around the central axis L 2 .
- the shaping roller 14 is moved toward the workpiece W by the roller moving means. This causes a pressure to be applied to the end surface Wb of the workpiece W from the shaping roller 14 , so that the workpiece W expands outwardly in a radial direction of the workpiece W. Hereby, diameter expansion molding is performed on the workpiece W.
- the distance ⁇ 0 between the rotation axis L 1 of the rotating table 10 (the central axis of the workpiece W) and the inner end surface 14 b of the shaping roller 14 is larger than the radius r of the mandrel 12 , but smaller than the radius R 0 (see FIG. 1 ) of the workpiece W before the workpiece W is forged and a radius R 1 (see FIG. 2 ) of the workpiece W after the workpiece W is forged.
- the shaping roller 14 is separated from the mandrel 12 , as illustrated in FIG. 2 .
- the outer peripheral surface 12 a of the mandrel 12 is separated from the inner end surface 14 b of the shaping roller 14 by a distance ⁇ 1 , so that a gap is provided between the outer peripheral surface 12 a of the mandrel 12 and the inner end surface 14 b of the shaping roller 14 .
- a pressure is applied to the end surface Wb of the workpiece W from the shaping roller 14 as described above, a radially inner part of the workpiece W is raised toward a shaping-roller- 14 side in the rotation-axis-L 1 direction, as illustrated in FIG. 2 .
- a boss portion Wc raised in the central-axis direction of the workpiece W is formed at a central part of the workpiece W.
- boss molding is performed on the workpiece W.
- the shaping roller 14 revolves around the rotation axis L 1 of the rotating table 10 as illustrated in FIG. 3 , when viewed from the workpiece W.
- a material of the workpiece W flows toward an outer-peripheral-surface-Wd side of the workpiece W so that the material is scraped off, as illustrated in FIG. 4 , and also flows toward a rotation-axis-L 1 side (a mandrel- 12 side).
- the diameter expansion molding to expand the workpiece W in the radial direction of the workpiece W is performed. Further, when the material of the workpiece W flows toward the rotation-axis-L 1 side (the mandrel- 12 side), the material of the workpiece W flows to the central-axis direction of the workpiece W along the outer peripheral surface 12 a of the mandrel 12 . Hereby, the boss molding to form the boss portion Wc is performed.
- JP 61-144232 A Japanese Patent Application Publication No. 61-144232 (JP 61-144232 A)
- JP 61-144232 A a position of an outer end 104 on a shaping surface 102 of a shaping roller 100 is placed at an inner side in a radial direction of the workpiece W relative to a position of an outer periphery W 0 b of the workpiece W 0 , as illustrated in FIG. 5 .
- a position of that outer end 14 c of the outer peripheral surface 14 a of the shaping roller 14 which is opposite to the rotation-axis-L 1 side in the central-axis-L 2 direction is placed at an outer side in the radial direction of the workpiece W relative to a position of the outer peripheral surface Wd of the workpiece W that has been forged, as illustrated in FIG. 2 .
- This causes such a state where the outer peripheral surface 14 a of the shaping roller 14 is pressed against a large area of the end surface Wb of the workpiece W in the radial direction of the workpiece W, from the beginning of the forging of the workpiece W to the end of the forging.
- This makes it possible to secure accuracy of the end surface Wb of the workpiece W that has been forged, by the outer peripheral surface 14 a of the shaping roller 14 . This accordingly improves accuracy of the end surface Wb of the workpiece W that has been forged.
- the forging device 1 can perform the diameter expansion molding and the boss molding at a low load.
- FIG. 6 such an example in which a mandrel 12 is provided separately from a rotating table 10 can be considered, as illustrated in FIG. 6 .
- FIG. 7 such an example in which a surface 10 a of a rotating table 10 is formed as an inclined surface, and an outer peripheral surface 14 a of a shaping roller 14 is formed to be inclined relative to a central axis L 2 can be also considered.
- splines may be formed on an outer peripheral surface 12 a of a mandrel 12 . This makes it possible to form a boss portion Wc while forming splines on an inner peripheral surface Wa of a workpiece W.
- FIG. 10 such an example in which a surface 10 a of a rotating table 10 is formed to have a waveform shape.
- FIG. 11 a forging device that does not include a mandrel 12 can be considered, as illustrated in FIG. 11 .
- a workpiece W that has not been forged yet is formed in a solid cylindrical shape.
- FIGS. 6 to 8 , 10 , and 11 partially illustrate a forging device.
- the forging device 1 which includes the rotating table 10 that rotates around the rotation axis L 1 , and the cylindrical shaping roller 14 , and which forges the cylindrical workpiece W such that the outer peripheral surface 14 a of the shaping roller 14 is pressed against the end surface Wb of the workpiece W in the central-axis direction of the workpiece W while the workpiece W is rotated by the rotating table 10 around the central axis of the workpiece W
- the shaping roller 14 is placed apart from the rotation axis L 1 , and the position of that outer end 14 c of the outer peripheral surface 14 a of the shaping roller 14 which is opposite to the rotation-axis-L 1 side in the central-axis-L 2 direction of the shaping roller 14 is placed at the outer side in the radial direction of the workpiece W relative to the position of the outer peripheral surface Wd of the workpiece W that has been forged.
- the diameter expansion molding to expand the cylindrical workpiece W in the radial direction can be performed such that the outer peripheral surface 14 a of the shaping roller 14 is pressed against the end surface Wb of the workpiece W in the central-axis-L 2 direction of the workpiece W while the workpiece W is rotated by the rotating table 10 around the central axis of the workpiece W.
- the shaping roller 14 is placed apart from the rotation axis L 1 of the rotating table 10 , the material of the workpiece W flows toward the rotation-axis-L 1 side relative to the shaping roller 14 , so that the boss molding to form the boss portion Wc formed by raising a central part of the workpiece W in the central-axis direction of the workpiece W can be performed.
- the diameter expansion molding and the boss molding can be performed at the same time. This makes it possible to manufacture a forging having the boss portion Wc while achieving reduction in cost.
- the position of that outer end 14 c of the outer peripheral surface 14 a of the shaping roller 14 which is opposite to the rotation-axis-L 1 side of the rotating table 10 in the central-axis-L 2 direction of the shaping roller 14 is placed at the outer side in the radial direction of the workpiece W relative to the position of the outer peripheral surface Wd of the workpiece W that has been forged.
- This causes such a state where the outer peripheral surface 14 a of the shaping roller 14 is pressed against a large area of the end surface Wb of the workpiece W, in the central-axis direction of the workpiece W, during the forging of the workpiece W.
- This makes it possible to secure accuracy of the end surface Wb of the workpiece W that has been forged, by the outer peripheral surface 14 a of the shaping roller 14 . This can accordingly improve the accuracy of the end surface Wb of the workpiece W that has been forged.
- the forging device 1 include the cylindrical mandrel 12 ; the central axis of the mandrel 12 accord with the rotation axis L 1 of the rotating table 10 ; the shaping roller 14 have the inner end surface 14 b placed at the rotation-axis-L 1 side in the central-axis-L 2 direction of the shaping roller 14 ; and the distance ⁇ 1 between the central axis of the mandrel 12 and the inner end surface 14 b be larger than the radius of the mandrel 12 , but smaller than the radius of the workpiece.
- the boss portion Wc having a hollow cylindrical shape in the central part of the workpiece W. Since the material of the workpiece W flows while making close contact with the outer peripheral surface 12 a of the mandrel 12 , it is possible to secure desired accuracy on an inner peripheral surface of the boss portion Wc by managing accuracy of the outer peripheral surface 12 a of the mandrel 12 .
- the forging device 1 includes two shaping rollers 14 , it is possible to shorten a time to forge the workpiece W. Also, the accuracy of the end surface Wb of the workpiece W is improved.
- the central axis L 2 of the shaping roller 14 is generally perpendicular to the rotation axis L 1 of the rotating table 10 .
- the two shaping rollers 14 can be integrated with each other by one shaft 20 while central axes of the two shaping rollers 14 accord with each other. This accordingly makes it possible to simplify the mechanism for supporting the two shaping rollers 14 . Accordingly, the two shaping rollers 14 can be easily handled. Further, a force that can be added to the workpiece W from the shaping rollers 14 can be increased. Also, rigidity of the shaping rollers 14 can be obtained.
- a forging manufactured by the forging device 1 and the forging method of the present invention is suitable for a power transmission component.
- the forging is most suitable for steel components used for power transmission, such as a gear wheel and a shaft used in an automobile, a construction vehicle, a construction machine, and the like, and particularly, a transmission gear wheel of an automobile and a sheave of CVT.
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- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
In a forging device including a rotating table and a shaping roller, which forging device forges a workpiece such that an outer peripheral surface of the shaping roller is pressed against an end surface of the workpiece in a central-axis direction of the workpiece while the workpiece is rotated by the rotating table, the shaping roller is placed apart from a rotation axis, and a position of that end of the outer peripheral surface of the shaping roller which is opposite to a rotation-axis side in a central-axis direction of the shaping roller is placed at an outer side in a radial direction of the workpiece relative to a position of an outer peripheral surface of the workpiece that has been forged.
Description
- The present invention relates to a forging device and a forging method each of which performs molding such that a shaping roller is pressed against a workpiece so as to expand the workpiece in a radial direction and a central-axis direction of the workpiece.
-
Patent Document 1 describes a forging method for performing diameter expansion molding to expand a cylindrical metal workpiece in a radial direction of the workpiece. In the forging method ofPatent Document 1, the workpiece is rotated around a central axis of the workpiece, and a cylindrical shaping roller is pressed against that end surface of the workpiece thus rotated which is on one side in a central-axis direction of the workpiece. The shaping roller makes contact with the workpiece as such, and then, the shaping roller is moved down with the shaping roller being rotated with the workpiece. Hereby, a pressure is applied to the workpiece from the shaping roller, so that the workpiece can be expanded in the radial direction. - Patent Document 1: Japanese Patent Application Publication No. 2011-224605 (JP 2011-224605 A)
- However, in the forging method of
Patent Document 1, although it is possible to perform diameter expansion molding to expand the workpiece in the radial direction of the workpiece, it is difficult to perform boss molding to form a boss portion formed by raising a central part of the workpiece in the central-axis direction of the workpiece. In view of this, it is necessary to separately perform a step of performing the boss molding after a step of performing diameter expansion molding is performed first by the forging method ofPatent Document 1. Accordingly, different forging devices are required for respective steps at the time when a forging having a boss portion is manufactured, which increases cost. - In view of this, the present invention has been accomplished in order to solve the above problems, and an object of the present invention is to provide a forging device and a forging method each of which can manufacture a forging having a boss portion while achieving reduction in cost.
- One aspect of the present invention to solve the above problems is characterized in that: in a forging device including a rotating table that rotates around a rotation axis, and a cylindrical shaping roller, the forging device forging a cylindrical workpiece such that an outer peripheral surface of the shaping roller is pressed against an end surface of the workpiece in a central-axis direction of the workpiece while the workpiece is rotated by the rotating table around a central axis of the workpiece, the shaping roller is placed apart from the rotation axis, and a position of that end of the outer peripheral surface of the shaping roller which is opposite to a rotation-axis side in a central-axis direction of the shaping roller is placed at an outer side in a radial direction of the workpiece relative to a position of an outer peripheral surface of the workpiece that has been forged.
- According to the above aspect, it is possible to perform diameter expansion molding to expand the cylindrical workpiece in the radial direction such that the outer peripheral surface of the shaping roller is pressed against the end surface of the workpiece in the central-axis direction of the workpiece while the workpiece is rotated by the rotating table around the central axis of the workpiece. Further, since the shaping roller is placed apart from the rotation axis of the rotating table, a material of the workpiece flows toward the rotation-axis side relative to the shaping roller, so that boss molding to form a boss portion formed by raising a central part of the workpiece in the central-axis direction of the workpiece can be performed. Thus, the diameter expansion molding and the boss molding can be performed at the same time. This makes it possible to manufacture a forging having the boss portion while achieving reduction in cost.
- Further, the position of that end of the outer peripheral surface of the shaping roller which is opposite to the rotation-axis side in the central-axis direction of the shaping roller is placed at the outer side in the radial direction of the workpiece relative to the position of the outer peripheral surface of the workpiece that has been forged. This causes such a state where the outer peripheral surface of the shaping roller is pressed against a large area of the end surface of the workpiece in the central-axis direction of the workpiece, during the forging of the workpiece. This makes it possible to secure accuracy of the end surface of the workpiece that has been forged, by the outer peripheral surface of the shaping roller. This can accordingly improve the accuracy of the end surface of the workpiece that has been forged.
- In the forging device, it is preferable that: the forging device include a cylindrical mandrel; a central axis of the mandrel accord with the rotation axis; the shaping roller have an inner end surface placed at the rotation-axis side in the central-axis direction of the shaping roller; and a distance between the central axis of the mandrel and the inner end surface be larger than a radius of the mandrel but smaller than a radius of the workpiece.
- According to the above aspect, by flowing the material of the workpiece between the outer peripheral surface of the mandrel and the inner end surface of the shaping roller, it is possible to form the boss portion having a hollow cylindrical shape in the central part of the workpiece. Since the material of the workpiece flows while making close contact with the outer peripheral surface of the mandrel, it is possible to secure desired accuracy in an inner peripheral surface of the boss portion by managing accuracy of the outer peripheral surface of the mandrel.
- It is preferable that the forging device include two shaping rollers.
- According to the above aspect, it is possible to shorten a time to forge the workpiece. Also, the accuracy of the end surface of the workpiece is improved.
- In the forging device, it is preferable that a central axis of the shaping roller be generally perpendicular to the rotation axis.
- According to the above aspect, it is possible to simplify a mechanism for supporting the shaping roller. Particularly, in a case where two shaping rollers are provided, the two shaping rollers can be integrated with each other by one shaft member while central axes of the two shaping rollers accord with each other. This makes it possible to simplify the mechanism for supporting the two shaping rollers.
- Another aspect of the present invention to solve the above problems is characterized in that: in a forging method for forging a cylindrical workpiece, by use of a rotating table that rotates around a rotation axis, and a cylindrical shaping roller, such that an outer peripheral surface of the shaping roller is pressed against an end surface of the workpiece in a central-axis direction of the workpiece while the workpiece is rotated by the rotating table around a central axis of the workpiece, the shaping roller is placed apart from the rotation axis, and a position of that end of the outer peripheral surface of the shaping roller which is opposite to a rotation-axis side in the central-axis direction of the shaping roller is placed at an outer side in a radial direction of the workpiece relative to a position of an outer peripheral surface of the workpiece that has been forged.
- According to the above aspect, it is possible to perform diameter expansion molding to expand the cylindrical workpiece in the radial direction such that the outer peripheral surface of the shaping roller is pressed against the end surface of the workpiece in the central-axis direction of the workpiece while the workpiece is rotated by the rotating table around the central axis of the workpiece. Further, since the shaping roller is placed apart from the rotation axis of the rotating table, a material of the workpiece flows toward the rotation-axis side relative to the shaping roller, so that boss molding to form a boss portion formed by raising a central part of the workpiece in the central-axis direction of the workpiece can be performed. Thus, the diameter expansion molding and the boss molding can be performed at the same time. This makes it possible to manufacture a forging having the boss portion while achieving reduction in cost.
- Further, the position of that end of the outer peripheral surface of the shaping roller which is opposite to the rotation-axis side in the central-axis direction of the shaping roller is placed at the outer side in the radial direction of the workpiece relative to the position of the outer peripheral surface of the workpiece that has been forged. This causes such a state where the outer peripheral surface of the shaping roller is pressed against a large area of the end surface of the workpiece in the central-axis direction of the workpiece, during the forging of the workpiece. This makes it possible to secure accuracy of the end surface of the workpiece that has been forged, by the outer peripheral surface of the shaping roller. This can accordingly improve the accuracy of the end surface of the workpiece that has been forged.
- In the forging method, it is preferable that: a cylindrical mandrel be used; a central axis of the mandrel accord with the rotation axis; the shaping roller have an inner end surface placed at the rotation-axis side in the central-axis direction of the shaping roller; and a distance between the central axis of the mandrel and the inner end surface be larger than a radius of the mandrel but smaller than a radius of the workpiece.
- According to the above aspect, by flowing the material of the workpiece between the outer peripheral surface of the mandrel and the inner end surface of the shaping roller, it is possible to form the boss portion having a hollow cylindrical shape in the central part of the workpiece. Since the material of the workpiece flows while making close contact with the outer peripheral surface of the mandrel, it is possible to secure desired accuracy in an inner peripheral surface of the boss portion by managing accuracy of the outer peripheral surface of the mandrel.
- In the forging method, it is preferable that two shaping rollers be used.
- According to the above aspect, it is possible to shorten a time to forge the workpiece. Also, the accuracy of the end surface of the workpiece is improved.
- In the forging method, it is preferable that a central axis of the shaping roller be generally perpendicular to the rotation axis.
- According to the above aspect, it is possible to simplify a mechanism for supporting the shaping roller. Particularly, in a case where two shaping rollers are provided, the two shaping rollers can be integrated with each other by one shaft member while central axes of the two shaping rollers accord with each other. This makes it possible to simplify the mechanism for supporting the two shaping rollers.
- According to the forging device and the forging method of the present invention, it is possible to manufacture a forging having a boss portion while achieving reduction in cost.
-
FIG. 1 is a sectional view illustrating a schematic configuration of a forging device of the present embodiment, and illustrates a state before forging is performed on a workpiece. -
FIG. 2 is a sectional view illustrating the schematic configuration of the forging device of the present embodiment, and illustrates a state after the forging is performed on the workpiece. -
FIG. 3 is a view to describe a principle to perform diameter expansion molding and boss molding on the workpiece. -
FIG. 4 is a sectional view taken along a line A-A inFIG. 3 . -
FIG. 5 is a view to describe a conventional technique. -
FIG. 6 is a sectional view illustrating a schematic configuration of a forging device of a modification. -
FIG. 7 is a sectional view illustrating a schematic configuration of a forging device of a modification. -
FIG. 8 is a sectional view illustrating a schematic configuration of a forging device of a modification. -
FIG. 9 is a top view of a mandrel in the forging device of the modification illustrated inFIG. 8 . -
FIG. 10 is a sectional view illustrating a schematic configuration of a forging device of a modification. -
FIG. 11 is a sectional view illustrating a schematic configuration of a forging device of a modification. - The following describes an embodiment of the present invention in detail with reference to the drawings.
- <Description of Forging Device>
- Initially described is a configuration of a forging
device 1. Here,FIGS. 1 and 2 are each a sectional view illustrating a schematic configuration of the forgingdevice 1 of the present embodiment.FIG. 1 illustrates a state before forging is performed on a workpiece W, andFIG. 2 illustrates a state after the forging is performed on the workpiece W. As illustrated inFIGS. 1 , 2, the forgingdevice 1 includes a rotating table 10, amandrel 12, a shapingroller 14, roller moving means (not shown), and so on. - The rotating table 10 rotates around a rotation axis L1. Further, the rotating table 10 rotates the workpiece W placed on a
surface 10 a, around a central axis of the workpiece W. - The
mandrel 12 is formed in a cylindrical shape. Themandrel 12 is placed on thesurface 10 a of the rotating table 10 so that a central axis of themandrel 12 accords with the rotation axis L1 of the rotating table 10. When the workpiece W is placed on thesurface 10 a of the rotating table 10, themandrel 12 is inserted inside an inner peripheral surface Wa of the workpiece W, and the workpiece W is placed on thesurface 10 a of the rotating table 10 with an outerperipheral surface 12 a of themandrel 12 making contact with the inner peripheral surface Wa of the workpiece W. This allows the central axis of the workpiece W to accord with the rotation axis L1 and the central axis of themandrel 12. - The shaping
roller 14 is formed in a cylindrical shape. Further, the shapingroller 14 includes an outerperipheral surface 14 a, aninner end surface 14 b, and so on. Here, theinner end surface 14 b is an end surface on a rotation-axis-L1 side in a central-axis-L2 direction of the shapingroller 14. - In an example illustrated in
FIG. 1 , two shapingrollers 14 are provided. The twoshaping rollers 14 are placed at respective positions whose phases are shifted by 180° to each other in a rotation direction of the rotating table 10. The twoshaping rollers 14 are integrated with each other by ashaft 20 in such a state where their central axes L2 accord with each other. Theshaft 20 is attached to ahousing 22 in a rotatable state. Because of this, the two shapingrollers 14 integrated with each other by theshaft 20 rotate integrally around the central axes L2 of the shapingrollers 14. - Further, as illustrated in
FIG. 1 , the shapingroller 14 is placed apart from the rotation axis L1. That is, a gap is provided between the rotation axis L1 and theinner end surface 14 b of the shaping roller 14 (more specifically, an intersection of theinner end surface 14 b with the central axis L2). A distance δ0 between the rotation axis L1 and theinner end surface 14 b is larger than a radius r of themandrel 12, but smaller than a radius R0 of the workpiece W. - Further, the central axis L2 of the shaping
roller 14 is generally perpendicular to the rotation axis L1. More specifically, the central axis L2 intersects with the rotation axis L1 at an angle of 90°±10° (that is, 80° to 100°), for example. - Note that materials of the rotating table 10, the
mandrel 12, and the shapingroller 14 may be cold working tool steel (SKD11, SKH), cemented carbide, and the like, for example. Further, the outerperipheral surface 14 a of the shapingroller 14 is a part that makes contact with the workpiece W, which will be described later. On this account, it is desirable that coating be performed on the outerperipheral surface 14 a of the shapingroller 14 so as to maintain a surface state. - Further, the roller moving means is attached to the
housing 22. The roller moving means moves thehousing 22 in parallel along a rotation-axis-L1 direction of the rotating table 10, so as to move the two shapingrollers 14 in parallel to the rotation axis L1. Note that the roller moving means is a ball screw, a hydraulic mechanism, or the like, for example. - Further, the forging
device 1 includes a controlling portion (not shown). The controlling portion is constituted by a microcomputer, for example, and controls driving of the rotating table 10, the roller moving means, and so on. - <Description of Forging Method>
- Next will be described a forging method for forging the workpiece W by use of the forging
device 1, as an operation of the forgingdevice 1 having the above configuration. - In the present embodiment, first, the workpiece W having a hollow cylindrical shape is placed on the
surface 10 a of the rotating table 10. At this time, themandrel 12 is inserted inside the inner peripheral surface Wa of the workpiece W so that the central axis of the workpiece W accords with the rotation axis L1 of the rotating table 10. Note that a height H (a length in the rotation-axis-L1 direction) of themandrel 12 is larger than a height h (a length in the rotation-axis-L1 direction) of the workpiece W. - Then, the rotating table 10 and the
mandrel 12 are rotated around the rotation axis L1 (the central axis of themandrel 12, the central axis of the workpiece W). Hereby, the workpiece W is rotated around the rotation axis L1. - Then, the shaping
roller 14 is moved toward the workpiece W by the roller moving means. Then, the outerperipheral surface 14 a of the shapingroller 14 is pressed against an end surface Wb of the workpiece W (an end surface thereof at a shaping-roller-14 side in the central-axis direction of the workpiece W), so that the shapingroller 14 makes contact with the workpiece W. Here, as described above, the workpiece W is being rotated around the rotation axis L1. Because of this, when the shapingroller 14 makes contact with the workpiece W as described above, the shapingroller 14 rotates following the workpiece W. That is, the shapingroller 14 rotates around the central axis L2. - Further, the shaping
roller 14 is moved toward the workpiece W by the roller moving means. This causes a pressure to be applied to the end surface Wb of the workpiece W from the shapingroller 14, so that the workpiece W expands outwardly in a radial direction of the workpiece W. Hereby, diameter expansion molding is performed on the workpiece W. - Further, in the present embodiment, the distance δ0 between the rotation axis L1 of the rotating table 10 (the central axis of the workpiece W) and the
inner end surface 14 b of the shapingroller 14 is larger than the radius r of themandrel 12, but smaller than the radius R0 (seeFIG. 1 ) of the workpiece W before the workpiece W is forged and a radius R1 (seeFIG. 2 ) of the workpiece W after the workpiece W is forged. Hereby, at the time when the workpiece W is forged and after the workpiece W is forged, the shapingroller 14 is separated from themandrel 12, as illustrated inFIG. 2 . More specifically, the outerperipheral surface 12 a of themandrel 12 is separated from theinner end surface 14 b of the shapingroller 14 by a distance δ1, so that a gap is provided between the outerperipheral surface 12 a of themandrel 12 and theinner end surface 14 b of the shapingroller 14. Because of this, when a pressure is applied to the end surface Wb of the workpiece W from the shapingroller 14 as described above, a radially inner part of the workpiece W is raised toward a shaping-roller-14 side in the rotation-axis-L1 direction, as illustrated inFIG. 2 . Hereby, a boss portion Wc raised in the central-axis direction of the workpiece W is formed at a central part of the workpiece W. Thus, boss molding is performed on the workpiece W. - Here, the following more specifically describes how the diameter expansion molding and the boss molding are performed on the workpiece W. At the time when the workpiece W is forged, the shaping
roller 14 revolves around the rotation axis L1 of the rotating table 10 as illustrated inFIG. 3 , when viewed from the workpiece W. At this time, due to movement of an intersection between the workpiece W and the shapingroller 14, a material of the workpiece W flows toward an outer-peripheral-surface-Wd side of the workpiece W so that the material is scraped off, as illustrated inFIG. 4 , and also flows toward a rotation-axis-L1 side (a mandrel-12 side). When the material of the workpiece W flows toward the outer-peripheral-surface-Wd side of the workpiece W, the diameter expansion molding to expand the workpiece W in the radial direction of the workpiece W is performed. Further, when the material of the workpiece W flows toward the rotation-axis-L1 side (the mandrel-12 side), the material of the workpiece W flows to the central-axis direction of the workpiece W along the outerperipheral surface 12 a of themandrel 12. Hereby, the boss molding to form the boss portion Wc is performed. - As described above, in the present embodiment, it is possible to perform the diameter expansion molding and the boss molding on the workpiece W at the same time.
- Here, in a conventional technique (e.g., Japanese Patent Application Publication No. 61-144232 (JP 61-144232 A), at the time when a workpiece W0 is forged and after the workpiece W0 is forged, a position of an
outer end 104 on ashaping surface 102 of a shapingroller 100 is placed at an inner side in a radial direction of the workpiece W relative to a position of an outer periphery W0 b of the workpiece W0, as illustrated inFIG. 5 . This causes such a state that the shapingsurface 102 of the shapingroller 100 is pressed against only part of an end surface W0 a of the workpiece W0 in the radial direction of the workpiece W0, so that accuracy of the end surface W0 a of the workpiece W0 that has been forged might decrease. - In contrast, in the forging
device 1 of the present embodiment, a position of thatouter end 14 c of the outerperipheral surface 14 a of the shapingroller 14 which is opposite to the rotation-axis-L1 side in the central-axis-L2 direction is placed at an outer side in the radial direction of the workpiece W relative to a position of the outer peripheral surface Wd of the workpiece W that has been forged, as illustrated inFIG. 2 . This causes such a state where the outerperipheral surface 14 a of the shapingroller 14 is pressed against a large area of the end surface Wb of the workpiece W in the radial direction of the workpiece W, from the beginning of the forging of the workpiece W to the end of the forging. This makes it possible to secure accuracy of the end surface Wb of the workpiece W that has been forged, by the outerperipheral surface 14 a of the shapingroller 14. This accordingly improves accuracy of the end surface Wb of the workpiece W that has been forged. - Further, in comparison with conventional die forging (forging using a molding die), the forging
device 1 can perform the diameter expansion molding and the boss molding at a low load. - Further, in the present embodiment, since the material of the workpiece W flows while making close contact with the
mandrel 12 from the beginning of molding, accuracy of an inside diameter of the workpiece W that has been forged can be easily secured. - Note that such an example in which only one shaping
roller 14 is provided can be considered as a modification. - Further, as another modification, such an example in which a
mandrel 12 is provided separately from a rotating table 10 can be considered, as illustrated inFIG. 6 . Further, as illustrated inFIG. 7 , such an example in which asurface 10 a of a rotating table 10 is formed as an inclined surface, and an outerperipheral surface 14 a of a shapingroller 14 is formed to be inclined relative to a central axis L2 can be also considered. Further, as illustrated inFIGS. 8 , 9, splines may be formed on an outerperipheral surface 12 a of amandrel 12. This makes it possible to form a boss portion Wc while forming splines on an inner peripheral surface Wa of a workpiece W. Further, as illustrated inFIG. 10 , such an example in which asurface 10 a of a rotating table 10 is formed to have a waveform shape. - Further, as another modification, a forging device that does not include a
mandrel 12 can be considered, as illustrated inFIG. 11 . At this time, a workpiece W that has not been forged yet is formed in a solid cylindrical shape. Note thatFIGS. 6 to 8 , 10, and 11 partially illustrate a forging device. - Further, as a modification, such an example in which a central axis L2 of a shaping
roller 14 intersects with a rotation axis L1 of a rotating table 10 at an angle of 45° to 90° can be considered. - <Effect of Present Embodiment>
- In the present embodiment, in the forging
device 1 which includes the rotating table 10 that rotates around the rotation axis L1, and thecylindrical shaping roller 14, and which forges the cylindrical workpiece W such that the outerperipheral surface 14 a of the shapingroller 14 is pressed against the end surface Wb of the workpiece W in the central-axis direction of the workpiece W while the workpiece W is rotated by the rotating table 10 around the central axis of the workpiece W, the shapingroller 14 is placed apart from the rotation axis L1, and the position of thatouter end 14 c of the outerperipheral surface 14 a of the shapingroller 14 which is opposite to the rotation-axis-L1 side in the central-axis-L2 direction of the shapingroller 14 is placed at the outer side in the radial direction of the workpiece W relative to the position of the outer peripheral surface Wd of the workpiece W that has been forged. - As such, the diameter expansion molding to expand the cylindrical workpiece W in the radial direction can be performed such that the outer
peripheral surface 14 a of the shapingroller 14 is pressed against the end surface Wb of the workpiece W in the central-axis-L2 direction of the workpiece W while the workpiece W is rotated by the rotating table 10 around the central axis of the workpiece W. Further, since the shapingroller 14 is placed apart from the rotation axis L1 of the rotating table 10, the material of the workpiece W flows toward the rotation-axis-L1 side relative to the shapingroller 14, so that the boss molding to form the boss portion Wc formed by raising a central part of the workpiece W in the central-axis direction of the workpiece W can be performed. Thus, the diameter expansion molding and the boss molding can be performed at the same time. This makes it possible to manufacture a forging having the boss portion Wc while achieving reduction in cost. - Further, the position of that
outer end 14 c of the outerperipheral surface 14 a of the shapingroller 14 which is opposite to the rotation-axis-L1 side of the rotating table 10 in the central-axis-L2 direction of the shapingroller 14 is placed at the outer side in the radial direction of the workpiece W relative to the position of the outer peripheral surface Wd of the workpiece W that has been forged. This causes such a state where the outerperipheral surface 14 a of the shapingroller 14 is pressed against a large area of the end surface Wb of the workpiece W, in the central-axis direction of the workpiece W, during the forging of the workpiece W. This makes it possible to secure accuracy of the end surface Wb of the workpiece W that has been forged, by the outerperipheral surface 14 a of the shapingroller 14. This can accordingly improve the accuracy of the end surface Wb of the workpiece W that has been forged. - Further, it is preferable that: the forging
device 1 include thecylindrical mandrel 12; the central axis of themandrel 12 accord with the rotation axis L1 of the rotating table 10; the shapingroller 14 have theinner end surface 14 b placed at the rotation-axis-L1 side in the central-axis-L2 direction of the shapingroller 14; and the distance δ1 between the central axis of themandrel 12 and theinner end surface 14 b be larger than the radius of themandrel 12, but smaller than the radius of the workpiece. - Hereby, by flowing the material of the workpiece W between the outer
peripheral surface 12 a of themandrel 12 and theinner end surface 14 b of the shapingroller 14, it is possible to form the boss portion Wc having a hollow cylindrical shape in the central part of the workpiece W. Since the material of the workpiece W flows while making close contact with the outerperipheral surface 12 a of themandrel 12, it is possible to secure desired accuracy on an inner peripheral surface of the boss portion Wc by managing accuracy of the outerperipheral surface 12 a of themandrel 12. - Further, when the forging
device 1 includes two shapingrollers 14, it is possible to shorten a time to forge the workpiece W. Also, the accuracy of the end surface Wb of the workpiece W is improved. - Further, in the forging
device 1, the central axis L2 of the shapingroller 14 is generally perpendicular to the rotation axis L1 of the rotating table 10. This makes it possible to simplify a mechanism for supporting the shapingroller 14. Particularly, in a case where two shapingrollers 14 are provided, the two shapingrollers 14 can be integrated with each other by oneshaft 20 while central axes of the two shapingrollers 14 accord with each other. This accordingly makes it possible to simplify the mechanism for supporting the two shapingrollers 14. Accordingly, the two shapingrollers 14 can be easily handled. Further, a force that can be added to the workpiece W from the shapingrollers 14 can be increased. Also, rigidity of the shapingrollers 14 can be obtained. - Note that the above embodiment is merely an example, and does not limit the present invention at all. It goes without saying that the present invention can be altered or modified variously within a range which does not deviate from the gist of the present invention.
- A forging manufactured by the forging
device 1 and the forging method of the present invention is suitable for a power transmission component. For example, the forging is most suitable for steel components used for power transmission, such as a gear wheel and a shaft used in an automobile, a construction vehicle, a construction machine, and the like, and particularly, a transmission gear wheel of an automobile and a sheave of CVT. -
- 1 forging device
- 10 rotating table
- 10 a surface
- 12 mandrel
- 12 a outer peripheral surface
- 14 shaping roller
- 14 a outer peripheral surface
- 14 b inner end surface
- 14 c outer end
- 20 shaft
- 22 housing
- L1 rotation axis
- L2 central axis
- W workpiece
- Wa inner peripheral surface
- Wb end surface
- Wc boss portion
- Wd outer peripheral surface
- H height (of mandrel)
- h height (of workpiece)
- r radius (of mandrel)
- R0 radius (of workpiece that has not been forged)
- R1 radius (of workpiece that has been forged)
- δ0 distance
- δ1 distance
Claims (8)
1. A forging device comprising:
a rotating table that rotates around a rotation axis, and
a cylindrical shaping roller, wherein
the forging device forges a cylindrical workpiece such that an outer peripheral surface of the shaping roller is pressed against an end surface of the workpiece in a central-axis direction of the workpiece while the workpiece is rotated by the rotating table around a central axis of the workpiece,
the shaping roller is placed apart from the rotation axis; and
a position of that end of the outer peripheral surface of the shaping roller which is opposite to a rotation-axis side in a central-axis direction of the shaping roller is placed at an outer side in a radial direction of the workpiece relative to a position of an outer peripheral surface of the workpiece that has been forged.
2. The forging device according to claim 1 , further comprising:
a cylindrical mandrel, wherein:
a central axis of the mandrel accords with the rotation axis;
the shaping roller has an inner end surface placed at the rotation-axis side in the central-axis direction of the shaping roller; and
a distance between the central axis of the mandrel and the inner end surface is larger than a radius of the mandrel but smaller than a radius of the workpiece.
3. The forging device according to claim 1 ,
wherein two shaping rollers are provided in the forging device.
4. The forging device according to claim 1 , wherein:
a central axis of the shaping roller is generally perpendicular to the rotation axis.
5. A forging method for forging a cylindrical workpiece, by use of a rotating table that rotates around a rotation axis, and a cylindrical shaping roller comprising:
rotating the workpiece around a central-axis direction of the workpiece by rotating the table,
pressing an outer peripheral surface of the shaping roller against an end surface of the workpiece in a central-axis direction of the workpiece, wherein
the shaping roller is placed apart from the rotation axis; and
a position of that end of the outer peripheral surface of the shaping roller which is opposite to a rotation-axis side in a central-axis direction of the shaping roller is placed at an outer side in a radial direction of the workpiece relative to a position of an outer peripheral surface of the workpiece that has been forged.
6. The forging method according to claim 5 , wherein:
a cylindrical mandrel is used;
a central axis of the mandrel accords with the rotation axis;
the shaping roller has an inner end surface placed at the rotation-axis side in the central-axis direction of the shaping roller; and
a distance between the central axis of the mandrel and the inner end surface is larger than a radius of the mandrel but smaller than a radius of the workpiece.
7. The forging method according to claim 5 , wherein:
two shaping rollers are used.
8. The forging method according to claim 5 , wherein:
a central axis of the shaping roller is generally perpendicular to the rotation axis.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2013-015916 | 2013-01-30 | ||
JP2013015916A JP2014144481A (en) | 2013-01-30 | 2013-01-30 | Forging apparatus and forging method |
PCT/JP2013/082464 WO2014119120A1 (en) | 2013-01-30 | 2013-12-03 | Forging device and forging method |
Publications (1)
Publication Number | Publication Date |
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US20150352629A1 true US20150352629A1 (en) | 2015-12-10 |
Family
ID=51261850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/764,699 Abandoned US20150352629A1 (en) | 2013-01-30 | 2013-12-03 | Forging device and forging method |
Country Status (8)
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US (1) | US20150352629A1 (en) |
EP (1) | EP2952273A4 (en) |
JP (1) | JP2014144481A (en) |
KR (1) | KR20150103187A (en) |
CN (1) | CN104968450A (en) |
BR (1) | BR112015018258A2 (en) |
RU (1) | RU2015131210A (en) |
WO (1) | WO2014119120A1 (en) |
Families Citing this family (2)
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CN106903255A (en) * | 2017-04-19 | 2017-06-30 | 中国航发北京航空材料研究院 | A kind of rotary rolling forging apparatus of Rotary forging |
TR201809473A2 (en) | 2018-07-03 | 2018-07-23 | Tusas Motor Sanayii Anonim Sirketi | A ROTATIONAL SYMMETRIC AND NON-SYMMETRIC PLASTIC FORMING MACHINE |
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US5987952A (en) * | 1996-06-24 | 1999-11-23 | The Gates Corporation | Method for making a hub/pulley with a radially inward annular collar |
US6434991B1 (en) * | 1999-12-15 | 2002-08-20 | Leico Gmbh & Co. Werkzeugmaschinenbau | Flow-forming method and apparatus |
US6647839B2 (en) * | 2000-03-14 | 2003-11-18 | Nissan Motor Co., Ltd. | Method of forming an integral tubular projection in a work by spinning and a product produced by the same |
JP2011224581A (en) * | 2010-04-15 | 2011-11-10 | Toyota Motor Corp | Roller forging method |
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DE2901083C2 (en) * | 1979-01-12 | 1983-05-11 | Siemens AG, 1000 Berlin und 8000 München | Smoothing device for perforated metal disks |
JPS61144232A (en) | 1984-12-17 | 1986-07-01 | Nabeya Kogyo Kk | Manufacture of pulley |
JP2000051987A (en) * | 1998-08-05 | 2000-02-22 | Daido Steel Co Ltd | Hot forging method |
JP2004098089A (en) * | 2002-09-05 | 2004-04-02 | Mitsubishi Heavy Ind Ltd | Method and device for forming disk-shaped component |
JP5056719B2 (en) * | 2008-10-17 | 2012-10-24 | トヨタ自動車株式会社 | Sequential molding apparatus and method |
JP2010099729A (en) * | 2008-10-27 | 2010-05-06 | Toyota Motor Corp | Sequential forming apparatus and its method |
CN101722260B (en) * | 2009-12-10 | 2011-04-27 | 中冶陕压重工设备有限公司 | Free forging method of forge piece of rotary arms |
JP2011224605A (en) | 2010-04-19 | 2011-11-10 | Toyota Motor Corp | Forging method |
-
2013
- 2013-01-30 JP JP2013015916A patent/JP2014144481A/en active Pending
- 2013-12-03 CN CN201380071753.5A patent/CN104968450A/en active Pending
- 2013-12-03 RU RU2015131210A patent/RU2015131210A/en unknown
- 2013-12-03 KR KR1020157020584A patent/KR20150103187A/en not_active Application Discontinuation
- 2013-12-03 BR BR112015018258A patent/BR112015018258A2/en not_active IP Right Cessation
- 2013-12-03 WO PCT/JP2013/082464 patent/WO2014119120A1/en active Application Filing
- 2013-12-03 US US14/764,699 patent/US20150352629A1/en not_active Abandoned
- 2013-12-03 EP EP13873655.8A patent/EP2952273A4/en not_active Withdrawn
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Publication number | Priority date | Publication date | Assignee | Title |
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US5987952A (en) * | 1996-06-24 | 1999-11-23 | The Gates Corporation | Method for making a hub/pulley with a radially inward annular collar |
US6434991B1 (en) * | 1999-12-15 | 2002-08-20 | Leico Gmbh & Co. Werkzeugmaschinenbau | Flow-forming method and apparatus |
US6647839B2 (en) * | 2000-03-14 | 2003-11-18 | Nissan Motor Co., Ltd. | Method of forming an integral tubular projection in a work by spinning and a product produced by the same |
JP2011224581A (en) * | 2010-04-15 | 2011-11-10 | Toyota Motor Corp | Roller forging method |
Non-Patent Citations (2)
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Original document with merged file for JP 2011224581 A is attached * |
Also Published As
Publication number | Publication date |
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CN104968450A (en) | 2015-10-07 |
WO2014119120A1 (en) | 2014-08-07 |
EP2952273A1 (en) | 2015-12-09 |
BR112015018258A2 (en) | 2017-07-18 |
RU2015131210A (en) | 2017-03-03 |
JP2014144481A (en) | 2014-08-14 |
EP2952273A4 (en) | 2016-03-23 |
KR20150103187A (en) | 2015-09-09 |
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