JP2013063450A - Cage and method of manufacturing cage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a facility for manufacturing cages in a feed direction of a strip and a shaped material fabricated from the same and reduce the installation space.SOLUTION: There is employed a method of manufacturing punched cages including: forming the shaped material 20 of a longitudinal shape by using the strip 10 as a raw material and by forming a pair of annulus forming parts 11, 11 and a plurality of bar parts 13 which connect the pair of annulus forming parts 11, 11 to form pockets 12 for receiving rolling elements; and forming the shaped material 20 in an annular shape by joining the opposite ends 21, 21 in the longitudinal direction of the same. In the method, the longitudinal direction of the shaped material 20 is oriented in a direction perpendicular to the feed direction of the strip 10 in a state before the opposite ends 21, 21 of the shaped material 20 are joined, and the shaped materials 20 are shaped sequentially while the strip 10 is fed sequentially in the feed direction.

Description

  The present invention relates to a cage used for a roller bearing and a method for manufacturing the cage.

  In the roller bearing, a retainer is disposed in an annular space between the inner race and the outer race to hold the rollers as rolling elements. The cage is provided with pockets for holding the rollers, and the column portions located between the pockets hold the intervals between the rollers.

  As a technique for manufacturing this cage, for example, there is one described in Patent Document 1. In this technique, a V-shaped foam forming process in which the cross-sectional shape perpendicular to the longitudinal direction of the steel strip as a material is bent into a V shape (concave shape), and also in the longitudinal direction Punching out pockets lined up at predetermined intervals, a cutting step of cutting the strip-shaped molding material formed with the pockets into a predetermined length along the longitudinal direction, and the cut molding material in a substantially circular shape It was formed by a process consisting of a bending process of bending into two and a bonding process of bonding both ends of the bent molded material (see, for example, Patent Document 1).

  In addition, for example, as described in Patent Document 2, a step of bending the cross-sectional shape perpendicular to the longitudinal direction into a concave shape (corresponding to the V-shaped foam molding step) with respect to the band material, and the longitudinal direction as well There is also a technique in which a step of punching out pockets arranged at predetermined intervals (corresponding to the pocket removal step) is performed simultaneously in one step (for example, see Patent Document 2).

JP 2007-16957 A JP 2009-191899 A

  In the prior art, for example, as shown in Patent Document 1, many processes for processing a steel strip as a material are continued. For example, as shown in Patent Document 2, there is a case in which the space required for installation of equipment is reduced by reducing the number of processes.

In these techniques, a plurality of processes for processing the strip are continuous, and equipment is required for each of the plurality of processes. That is, it is necessary to parallel a plurality of facilities.
Further, these plural equipments are arranged so that the longitudinal direction of the band material and the molding material obtained by processing the band material is the molding feed direction. Since both the raw material strip and the molded material obtained by processing it are long in the longitudinal direction, in these facilities, it is necessary to secure a large installation space particularly along the feeding direction. In addition, it is not preferable that the equipment is long in only one direction because the flow line of the operator in managing the equipment becomes long.

  Then, this invention makes it a subject to shorten the installation which manufactures a holder | retainer in the feed direction of a strip | belt material and the molding material which processed it, and to reduce the installation space.

  In order to solve the above-described problems, the present invention provides a plurality of column portions that connect a pair of annular forming portions and a pair of annular forming portions so as to form a pocket that accommodates rolling elements, using a band material as a raw material. In the manufacturing method of a punching cage that joins both longitudinal ends of the molding material to form an annular shape, in a state before joining both ends of the molding material, A punching cage manufacturing method, wherein a longitudinal direction of the molding material is arranged in a direction orthogonal to a feeding direction of the strip material, and the molding material is progressively molded while the strip material is sequentially fed in the feeding direction. The method was adopted.

  According to this configuration, the longitudinal direction of the molding material is arranged in a direction perpendicular to the molding feed direction, that is, a direction perpendicular to the feeding direction of the strip material, and molding is performed while carrying out so-called progressive feeding. The equipment for manufacturing the cage can be shortened with respect to the feeding direction of the band material as a raw material and the molding material processed from the material, and the installation space can be reduced.

  In this configuration, the strip material is separated from the molding materials adjacent to each other in the feeding direction, leaving a sun connecting the molding materials, and a cutting step of molding a joint at both longitudinal ends of the molding material; , A molding step for molding a recess along the longitudinal direction of the molding material, a pocket molding step for punching out the pocket, a bending step for bending the molding material in an annular shape, and a joint for joining both longitudinal ends of the molding material. The structure provided with the process and the cutting process which separates the said molding material from the other molding material adjacent to the said feed direction by the said cutting | disconnection of the said sun can be employ | adopted.

  At this time, the timing of performing the separation process can be set at a free time in relation to the cutting process, the molding process, the pocket molding process, the bending process, and the joining process, for example, the separation process, The structure performed between the said bending process and the said joining process is employable. Moreover, the structure by which the said separation process is performed before the said bending process can also be employ | adopted.

  As another configuration, the timing for performing the separation process can be set after the joining process. In other words, the configuration is such that the band material is separated by separating the molding materials adjacent to each other in the feeding direction, leaving a sun connecting the molding materials, and forming a joint at both longitudinal ends of the molding material. A step of molding a recess along the longitudinal direction of the molding material, a pocket molding step of punching out the pocket, a bending step of bending the molding material in an annular shape, and joining both longitudinal ends of the molding material Up to the joining step to be performed is a structure in which the molding materials adjacent in the feeding direction are connected by the sun in a state of being sequentially formed.

  According to this configuration, since a plurality of molding materials adjacent in the feeding direction are fed together with the band material via the sun, the configuration of the upper and lower molds and the feeding device for performing progressive molding can be simplified. .

  In each of these configurations, the cutting process, the molding process, the pocket molding process, the bending process, and the joining process are not necessarily limited to this order. In particular, the order of the cutting process, the molding process, and the pocket molding process is as follows. Is optional. However, it is desirable that the joining process is after the bending process. Moreover, it is desirable that the bending process is subsequent to the cutting process, the molding process, and the pocket molding process.

  In addition, the cutting process, the molding process, and the pocket molding process are each provided in parallel along the feeding direction of the band material, and may be performed in order by a plurality of presses. Further, it may be performed simultaneously by one press at one place in the feeding direction. That is, it is possible to employ a configuration in which a plurality of steps selected from the cutting step, the forming step, and the pocket forming step are simultaneously performed with a single press.

Furthermore, any one of the cutting process, the forming process, the pocket forming process, the bending process, and the joining process may be performed by another device. For example, the cutting process, the molding process, and the pocket molding process are performed with a continuous device, and after the molding material is cut off, the bending process and the joining process are performed, or the cutting process, the molding process, the pocket molding process, and the bending process. It is also possible to adopt a configuration in which the joining process is performed after the molding material is cut off with a continuous device.
That is, the band material, the molding material adjacent to each other in the feeding direction is separated, leaving a sun connecting the molding materials, and a cutting step of forming a joint at both longitudinal ends of the molding material, A molding process for molding a recess along the longitudinal direction of the molding material, a pocket molding process for punching out the pocket, a bending process for bending the molding material in an annular shape, and a joining process for joining both longitudinal ends of the molding material. It is possible to adopt a configuration in which one or a plurality of steps selected from the inside is performed by a single facility that is continuous in the feed direction, and the other is performed by another facility.

  At this time, it is desirable that a separation step of separating the molding material from other molding materials adjacent in the feeding direction by cutting the sun is provided at the end of a single facility continuous in the feeding direction.

  Further, as another configuration, without using another equipment, in particular, the cutting process, the forming process, the pocket forming process, the bending process, and the joining process, a single equipment that continues in the feed direction. The structure which shape | molds continuously by can be employ | adopted.

  Furthermore, in each of these configurations, the bending step can include at least one preliminary bending step before the joining step. If there is a pre-bending step, for example, in the pre-bending step, the ends of the molding material are preliminarily bent into a circular arc shape along the longitudinal direction so that both ends thereof are When forming an annular shape facing each other, it is easy to make the entire shape closer to a perfect circle without generating a break point in the facing portion. Moreover, you may perform a prebending with respect to intermediate parts other than a longitudinal direction both ends.

In each of these configurations, a metal material can be adopted as the band material.
Moreover, when the said strip | belt material is a steel plate, the said joining process can be set as the structure which joins the longitudinal direction both ends of the said shaping | molding material by welding, for example.

  In addition, as a configuration of the joint portion, the joint portion is an unevenness that meshes with each other, and the joining step can be configured to join both end portions in the longitudinal direction by meshing the joint portions. At this time, the aforementioned welding may be used in combination.

  Further, in these configurations, the cutting step can be performed by a single press, in particular, leaving a sun that connects the molding materials adjacent to each other in the feeding direction. It is possible to adopt a configuration in which the separating step and the step of forming the joint portion at both ends in the longitudinal direction of the molding material are performed separately by separate presses. Since the length of the equipment (the length in the feed direction) is shortened, it is easy to adopt a configuration in which the press is divided in this way.

Moreover, the said pocket shaping | molding process employ | adopts the structure which punches the said pocket from the side used as the internal diameter surface toward the side used as an outer-diameter surface, for example, when a molding material is bent cyclically at the said bending process. be able to.
At this time, the pocket forming step is such that the pocket is formed by lowering the upper die relative to the lower die, and the bending step is performed by lifting both longitudinal ends of the molding material upward. A configuration that is bent in an annular shape can be employed.

  Furthermore, the rolling bearing cage manufactured by the manufacturing method of the punched cage having each of these configurations is inserted into the annular space between the inner race ring (inner ring) and the outer race ring (outer ring). It can employ | adopt as a holder | retainer which hold | maintains a rolling element along the circumferential direction in the annular space with respect to the bearing which has arranged several moving bodies.

  This invention arranges the longitudinal direction of the molding material in the direction perpendicular to the molding feed direction, that is, the direction perpendicular to the feeding direction of the strip material, and forms the punching cage while carrying out so-called progressive feeding. The equipment to be manufactured can be shortened with respect to the feeding direction of the band material as a raw material and the molding material processed from the material, and the installation space can be reduced.

1 shows an embodiment, (a) is a plan view showing a manufacturing method of a punching cage, (b) is a front view of the same. Right side view of FIG. Perspective view of punched cage Flow chart showing the manufacturing method of the punching cage of this embodiment

An embodiment of the present invention will be described with reference to the drawings. In this embodiment, the pair of annular forming portions 11 and 11 are connected to each other so as to form a pair of annular forming portions 11 and 11 and a pocket 12 that accommodates rolling elements such as rollers, using the band material 10 as a raw material. This is a manufacturing method of a punching cage 30 in which a plurality of pillar portions 13 are formed to form a longitudinal molding material 20 and both longitudinal ends 21 and 21 of the molding material 20 are joined to form an annular shape.
Hereinafter, the punching cage 30 is simply referred to as a cage 30. This embodiment shows a manufacturing method of a needle roller bearing retainer 30 as shown in FIG. 3 as an example.

  As the material for the strip 10, a metal is usually used. In particular, in this embodiment, a steel plate is used, but other materials such as a resin may be used.

  FIG. 4 is a flowchart showing a process for manufacturing the cage 30 of this embodiment. This embodiment includes a cutting process A, a forming process B, a pocket forming process C, a bending process D, a joining process E, and a cutting process F in order. Moreover, FIG.1 and FIG.2 is schematic which represents the content of the process with respect to the strip | belt material 10 and the molding material 20 in each of these process AF. With reference to these FIG.1 and FIG.2, the manufacturing method of the holder | retainer 30 is demonstrated.

  First, the strip 10 having the approximate circumferential length of the cage 30 having a width dimension W is inserted into a progressive press. Then, the belt 10 and the molding material 20 processed by the feeding device (not shown) are fed by adding the gap L2 between the molding materials 20 and 20 adjacent to each other in the feeding direction to the approximate width dimension L1 of the cage 30. While carrying the amount L3 at a time, each time the conveyance of L3 is finished, progressive molding is performed by pressing the upper molds a1 to f against the lower mold g. The feed direction is from left to right as shown in FIGS.

  Reference numeral A in the figure indicates that the strip 10 is separated from the concave and convex portions meshing with each other at both longitudinal ends 21 and 21 of the molding material 20 leaving the sun 14 connecting the molding materials 20 and 20 adjacent in the feeding direction. The area which performs the cutting process A which shape | molds the junction parts 15 and 16 which become is shown.

  Of the cutting step A, reference numeral A1 in the figure indicates a step of separating the molding materials 20 and 20 by leaving the sun 14 connecting the molding materials 20 and 20 adjacent to each other in the feed direction by the lowering of the upper mold a1. It is. At this stage, the sun 14 has a trapezoidal shape that gradually narrows as it advances in the feeding direction.

  Reference numeral A <b> 2 is a first step for forming the joints 15 and 16 at the longitudinal ends 21 and 21 of the molding material 20 while providing the feed hole 19 by lowering the upper mold a <b> 2. A jig (not shown) of a feeding device is passed through the feeding hole 19 to assist the feeding of the band material 10 and the molding material 20 at the distance L3.

  Reference numeral A1 'is a step of dividing the sun 14 into two narrower suns 14' and 14 'by hollowing out the inside of the trapezoidal sun 14 by lowering the upper mold a1'. The suns 14 'and 14' have a square shape in plan view, and the width thereof is narrower than that of the trapezoidal sun 14 in the previous stage, so that cutting in the separation step F described later is facilitated.

  Reference symbol A2 'is a second step for forming the joint portions 15 and 16 at the longitudinal ends 21 and 21 of the molding material 20 by the lowering of the upper mold a2'. The joint portion 16 is a convex portion formed by the concave portion 16a formed in the first step and the concave portion 16b formed in the second step.

  A symbol B in the drawing indicates an area where a molding process B for molding the concave portion 17 along the longitudinal direction of the molding material 20 is performed.

  In the molding step B, the depression 17 that continues in the same cross section over the entire length in the longitudinal direction of the molding material 20 is formed by the lowering of the upper die b. The cross-sectional shape of the recess 17 is appropriately selected depending on the type of bearing and the type of roller. By forming the concave portion 17, when the molding material 20 is bent into a cylindrical shape in the bending step D described later, the center portion in the width direction and the end portion in the width direction of the molding material 20 are stepped with respect to the radial direction. It happens.

  A symbol C in the drawing indicates an area in which a pocket forming step C is performed in which a plurality of pockets 12 are punched at predetermined intervals along the longitudinal direction of the molding material 20.

  In the pocket forming step C, reference numeral C1 in the figure is a step of making a long hole forming the pocket 12 by lowering the upper mold c1. Reference numeral C2 in the figure is a step in which the upper mold c2 is lowered and nail-molded on the inner surface (edge in the circumferential direction) of the pocket 12.

  In this pocket molding, the upper molds c1 and c2 which are pocket molding dies are removed from the inner diameter surface side when the molding material 20 is bent into a cylindrical shape in the bending process D described later. It goes toward the radial surface. However, the upper molds c1 and c2 and the lower mold g, which are pocket molds, are turned upside down so that this is performed in the opposite direction, that is, from the outer diameter surface side toward the inner diameter surface side. Also good. The same applies to the preceding steps A and B.

  Further, in the preceding step, the recess 17 is formed, so that the center portion in the width direction of the molding material 20 among the column portions 13 positioned between the pockets 12 and 12 formed in the pocket forming step C is: It becomes a shape dented in the radial direction outer side than the annular formation part 11 located in the width direction end part of the molding material 20.

  Next, a symbol D in the drawing indicates an area where a bending process D for bending the molding material 20 into an annular shape is performed. In this bending operation, a jig (not shown) is applied to the longitudinal ends 21 and 21 of the molding material 20, and the molding material 20 is pressed against the jig by lowering an upper die (not shown). This is performed by bringing the longitudinal ends 21 and 21 toward the inside (the center side of the width W of the strip 10). FIG. 2 shows a side view in which the longitudinal end portions 21 and 21 of the molding material 20 are lifted in the bending step D, and then moved toward the inside so that the molding material 20 is gradually bent into an annular shape. FIG.

  In this bending step D, preliminary bending may be performed before the molding material 20 is bent into an annular shape. For example, if the vicinity of both ends 21 and 21 in the longitudinal direction of the molding material 20 is preliminarily bent in an arc shape along the longitudinal direction, the ends 21 and 21 are opposed to each other to form a ring. It is easy to make the entire shape closer to a perfect circle without generating a break point at the facing portion. Further, preliminary bending may be performed on intermediate portions other than the longitudinal ends 21 and 21.

  A symbol E in the drawing indicates an area where the joining process E for joining the longitudinal ends 21 and 21 of the molding material 20 is performed.

In this joining step E, the projections 15 and 16 formed in the cutting step A are engaged with each other so that the longitudinal ends 21 and 21 of the molding material 20 are joined. Thereby, the molding material 20 becomes annular (cylindrical).
Here, since the strip 10 is a steel plate, the longitudinal ends 21 and 21 may be joined together by welding instead of or in addition to joining by joining the joints 15 and 16.
Moreover, the shape of the junction parts 15 and 16 is not limited to this embodiment, Other well-known engagement structures, such as another uneven | corrugated shape and a convex part which enters into a hole, can be employ | adopted.

  Reference numeral F in the drawing indicates an area where a cutting step F for cutting the annular molding material 20 from other molding materials 20 adjacent in the feeding direction is performed.

  In the separation step F, the sun 14 (suns 14 ′, 14 ′) is cut by the lowering of the upper mold f to separate the molding material 20, and the cage 30 is completed.

  Note that the steps shown in this embodiment are general, and the number of steps may be increased or decreased, the order may be changed, and some steps may be omitted depending on the product shape and specifications.

  For example, the cutting process A, the forming process B, the pocket forming process C, the bending process D, and the joining process E are not necessarily limited to this order. In particular, the cutting process A, the forming process B, and the pocket forming process C The order is arbitrary. However, it is desirable that the joining process E is a subsequent stage of the bending process D. Moreover, it is desirable that the bending process D is a subsequent stage of the cutting process A, the forming process B, and the pocket forming process C.

  Further, the cutting step A, the forming step B, and the pocket forming step C are provided in parallel along the feeding direction of the band member 10 and may be sequentially performed by a plurality of presses. Some of them may be performed simultaneously by one press at one place in the feeding direction. That is, it is possible to adopt a configuration in which a plurality of processes selected from the cutting process A, the forming process B, and the pocket forming process C are simultaneously performed with a single press.

  Furthermore, any one of the cutting process A, the forming process B, the pocket forming process C, the bending process D, and the joining process E may be performed by another apparatus. For example, a configuration in which a cutting process A, a molding process B, and a pocket molding process C are performed with a continuous apparatus and the molding material 20 is cut off, followed by a bending process D and a joining process E, or a cutting process A and a molding process B. A configuration is also conceivable in which the process up to the pocket forming process C and the bending process D is performed with a continuous apparatus, and after the molding material 20 is cut off, the joining process E is performed.

  In other words, the band material 10 is separated while leaving the sun 14 connecting the molding materials 20 and 20 adjacent to each other in the feed direction, and the joining portions 15 and 16 are molded at the longitudinal ends 21 and 21 of the molding material 20. A, a molding process B for molding the recess 17 along the longitudinal direction of the molding material 20, a pocket molding process C for punching out the pocket 12, a bending process D for bending the molding material 20 in an annular shape, and a longitudinal direction of the molding material 20 One or a plurality of steps selected from the joining step E for joining the two end portions 21 and 21 are performed with a single facility continuous in the feeding direction in an appropriate order, and after the molding material 20 is cut off, It is the structure which performs this process with another installation.

DESCRIPTION OF SYMBOLS 10 Band material 11 Annular formation part 12 Pocket 13 Pillar part 14 Sun 15,16 Joint part 17 Recessed part 18 Protruding part 19 Feed hole 20 Molding material 21 Longitudinal direction both ends 30 Punched holder (retainer)
A, A1, A2, A1 ′, A2 ′ Cutting process B Molding process C, C1, C2 Pocket molding process D Bending process E Joining process F Cutting process a, a1, a2, a1 ′, a2 ′, b, c1, c2, f Upper mold g Lower mold

Claims (17)

A plurality of connecting the pair of annular forming portions (11, 11) so as to form a pair of annular forming portions (11, 11) and a pocket (12) for accommodating rolling elements, using the band material (10) as a raw material. Of the punching cage which is formed into a circular shape by joining the longitudinal ends (21, 21) of the molding material (20). In the manufacturing method,
Before joining both ends (21, 21) of the molding material (20), the longitudinal direction of the molding material (20) is arranged in a direction perpendicular to the feeding direction of the strip material (10), and the band A method for manufacturing a punching cage, wherein the molding material (20) is formed in order while the material (10) is sequentially fed in the feeding direction.   The strip (10) is separated from the molding materials (20, 20) adjacent to each other in the feeding direction, leaving a sun (14) connecting the molding materials (20, 20). ) In the longitudinal direction both ends (21, 21), the cutting step (A), and the molding step in which the concave portion (17) is molded along the longitudinal direction of the molding material (20). (B), a pocket forming step (C) for punching out the pocket (12), a bending step (D) for bending the molding material (20) in an annular shape, and both longitudinal ends (21) of the molding material (20) , 21), and a cutting step (F) in which the molding material (20) is separated from the other molding material (20) adjacent in the feeding direction by cutting the sun (14). A method for manufacturing a punched cage according to claim 1, comprising:   The method for manufacturing a punched cage according to claim 2, wherein the separation step (F) is performed between the bending step (D) and the joining step (E).   The method for manufacturing a punched cage according to claim 2, wherein the separation step (F) is performed before the bending step (D).   The strip (10) is separated from the molding materials (20, 20) adjacent to each other in the feeding direction, leaving a sun (14) connecting the molding materials (20, 20). ) In the longitudinal direction both ends (21, 21), the cutting step (A), and the molding step in which the concave portion (17) is molded along the longitudinal direction of the molding material (20). (B), a pocket forming step (C) for punching out the pocket (12), a bending step (D) for bending the molding material (20) in an annular shape, and both longitudinal ends (21) of the molding material (20) , 21) until the joining step (E) is performed in a state where the molding materials (20, 20) adjacent to each other in the feeding direction are connected by the sun (14). The manufacturing method of the punching cage of claim | item 1.   The plurality of steps selected from the cutting step (A), the forming step (B), and the pocket forming step (C) are simultaneously performed by a single press. The manufacturing method of the punching holder | retainer as described in any one.   The strip (10) is separated from the molding materials (20, 20) adjacent to each other in the feeding direction, leaving a sun (14) connecting the molding materials (20, 20). ) In the longitudinal direction both ends (21, 21), the cutting step (A), and the molding step in which the concave portion (17) is molded along the longitudinal direction of the molding material (20). (B), a pocket forming step (C) for punching out the pocket (12), a bending step (D) for bending the molding material (20) in an annular shape, and both longitudinal ends (21) of the molding material (20) 21), one or a plurality of steps selected from the joining step (E) for joining are performed in a single facility continuous in the feed direction, and the other is performed in another facility. The manufacturing method of the punching cage of claim | item 1.   At the end of a single facility continuous in the feeding direction, a cutting step (F) for separating the molding material (20) from other molding materials (20) adjacent in the feeding direction by cutting the sun (14). The method for manufacturing a punching cage according to claim 7, wherein the punching cage is provided.   The cutting process (A), the molding process (B), the pocket molding process (C), the bending process (D) and the joining process (E) are continuously performed with a single facility that is continuous in the feed direction. The punching cage manufacturing method according to claim 2, wherein the punching cage is molded.   The punching cage according to any one of claims 2 to 9, wherein the bending step (D) includes at least one preliminary bending step before the joining step (E). Production method.   11. The punching cage manufacturing method according to any one of claims 2 to 10, characterized in that the strip (10) is a metal material.   The said strip | belt material (10) is a steel plate, and the said joining process (E) joins the said longitudinal direction both ends (21, 21) by welding, It is any one of Claim 2 thru | or 10 characterized by the above-mentioned. The manufacturing method of the punching cage of description.   The joints (15, 16) are concave and convex portions that mesh with each other, and the joining step (E) joins the longitudinal ends (21, 21) by meshing the joints (15, 16). The manufacturing method of the punching cage | basket as described in any one of Claims 2 thru | or 12 characterized by these.   The cutting step (A) includes separating the molding materials (20, 20) adjacent to each other in the feeding direction, leaving a sun (14) connecting the molding materials (20, 20), and the molding material. The step of forming the joints (15, 16) at both longitudinal ends (21, 21) of (20) is performed separately by separate presses. The manufacturing method of the punching cage of description.   In the pocket forming step (C), when the molding material (20) is bent in an annular shape in the bending step (D), the pocket (12) is directed from the inner surface to the outer surface. The punching cage manufacturing method according to any one of claims 2 to 14, wherein the punching is performed.   In the pocket forming step (C), the pocket (12) is formed by lowering the upper die (c) with respect to the lower die (g), and the bending step (D) 16. The method of manufacturing a punched cage according to claim 15, wherein the longitudinal ends (21, 21) of the material (20) are bent upward by lifting upward.   A rolling bearing cage manufactured by the punched cage manufacturing method according to any one of claims 1 to 16.

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