CN111396444A - Piston connecting rod, connecting rod blank forging die and piston connecting rod manufacturing method - Google Patents

Piston connecting rod, connecting rod blank forging die and piston connecting rod manufacturing method Download PDF

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Publication number
CN111396444A
CN111396444A CN202010404377.9A CN202010404377A CN111396444A CN 111396444 A CN111396444 A CN 111396444A CN 202010404377 A CN202010404377 A CN 202010404377A CN 111396444 A CN111396444 A CN 111396444A
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CN
China
Prior art keywords
connecting rod
blank
core
die
rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010404377.9A
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Chinese (zh)
Inventor
邱劲草
杜佳
王立新
陆磊
刘雨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SAIC General Motors Corp Ltd
Pan Asia Technical Automotive Center Co Ltd
Original Assignee
SAIC General Motors Corp Ltd
Pan Asia Technical Automotive Center Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SAIC General Motors Corp Ltd, Pan Asia Technical Automotive Center Co Ltd filed Critical SAIC General Motors Corp Ltd
Priority to CN202010404377.9A priority Critical patent/CN111396444A/en
Publication of CN111396444A publication Critical patent/CN111396444A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/02—Constructions of connecting-rods with constant length
    • F16C7/023—Constructions of connecting-rods with constant length for piston engines, pumps or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/17—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N1/00—Constructional modifications of parts of machines or apparatus for the purpose of lubrication
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/20—Shaping by sintering pulverised material, e.g. powder metallurgy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/40—Shaping by deformation without removing material
    • F16C2220/46—Shaping by deformation without removing material by forging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/22—Internal combustion engines

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Forging (AREA)

Abstract

The invention discloses a piston connecting rod, a connecting rod blank forging die and a piston connecting rod manufacturing method, wherein the piston connecting rod is manufactured by a connecting rod blank; the piston connecting rod comprises a rod body, a piston pin connecting ring arranged at one end of the rod body and a crankshaft connecting ring arranged at the other end of the rod body; two oil grooves are directly formed on the inner surface of the piston pin connecting ring, and each oil groove is parallel to the axis of the piston pin connecting ring; the two oil grooves are symmetrically arranged on the left side and the right side of the rod body. The invention discloses a piston connecting rod, a connecting rod blank forging die and a piston connecting rod manufacturing method.

Description

Piston connecting rod, connecting rod blank forging die and piston connecting rod manufacturing method
Technical Field
The invention relates to the technical field of piston parts, in particular to a piston connecting rod, a connecting rod blank forging die and a piston connecting rod manufacturing method.
Background
When the internal combustion engine works, the piston pin and the small end part of the connecting rod do reciprocating motion, and the reciprocating motion is mainly influenced by the combustion pressure in the cylinder, the inertia force of the reciprocating motion, the reaction force of the cylinder body and other forces. During the whole combustion cycle of the four-stroke engine, particularly at the tail end of an exhaust stroke and the beginning of an intake stroke, the reciprocating part of the piston connecting rod assembly has the change of the total stress direction, particularly the change that a piston pin is pressed on a connecting rod small end hole towards a crankshaft direction and is stressed towards a cylinder cover direction and is pulled downwards by a connecting rod small end. During the process of the stress variation, if the system lubrication design is not reasonable, knocking noise of the piston pin and the small end of the connecting rod can be caused.
Disclosure of Invention
The invention aims to provide a piston connecting rod capable of improving lubricating performance, a connecting rod blank forging die and a piston connecting rod manufacturing method.
The technical scheme of the invention provides a piston connecting rod, which is manufactured by a connecting rod blank;
the piston connecting rod comprises a rod body, a piston pin connecting ring arranged at one end of the rod body and a crankshaft connecting ring arranged at the other end of the rod body;
two oil grooves are directly formed on the inner surface of the piston pin connecting ring, and each oil groove is parallel to the axis of the piston pin connecting ring;
the two oil grooves are symmetrically arranged on the left side and the right side of the rod body.
Further, the crankshaft connecting ring, the rod body, and the piston pin connecting ring are integrally formed.
Further, the connecting rod blank comprises a rod body blank for forming the rod body, a piston pin connecting ring blank for forming the piston pin connecting ring and a crankshaft connecting ring blank for forming a crankshaft connecting ring;
wherein an oil groove blank for forming the oil groove is directly formed on the inner surface of the piston pin connecting ring blank.
Further, the connecting rod blank is formed by metal powder through forging and pressing of a connecting rod blank forging die.
The technical scheme of the invention also provides a connecting rod blank forging die for forming the connecting rod blank, which comprises a middle die for defining the peripheral outline of the connecting rod blank, a lower punch die for defining the bottom outline of the connecting rod blank, an upper punch die for defining the top outline of the connecting rod blank, a first rod core for forming the piston pin connecting ring blank and a second rod core for forming the crankshaft connecting ring blank;
a core protrusion for forming the oil groove blank is arranged on the first core rod;
the upper punching die is provided with a first rod core through hole for the first rod core to pass through, and the lower punching die is provided with a first rod core accommodating groove for accommodating the first rod core;
the upper punch die is provided with a second rod core through hole for the second rod core to pass through, and the lower punch die is provided with a second rod core accommodating groove for accommodating the second rod core.
Further, the cross section of the rod core bulge is semicircular.
Further, the middle die is provided with a containing cavity therein;
the lower end of the upper punching die is arranged in the accommodating cavity, and the upper end of the lower punching die is arranged in the accommodating cavity;
a preset gap is reserved between the lower end of the upper punching die and the upper end of the lower punching die;
the lower die shell of the lower die is in sealed sliding connection with the cavity wall of the accommodating cavity, and the upper die shell of the upper die is in sealed sliding connection with the cavity wall of the accommodating cavity.
Further, a downwardly convex blank top surface forming surface is arranged on the bottom surface of the upper die, and an upwardly convex blank bottom surface forming surface is arranged on the top surface of the lower die.
The technical scheme of the invention also provides a piston connecting rod manufacturing method for manufacturing the piston connecting rod by adopting the connecting rod blank forging die, which comprises the following steps:
s001: installing a connecting rod blank forging die;
s002: the lower punching die moves upwards and is fixed, and a concave cavity is defined by the middle die and the lower punching die;
s003: punching metal powder into the concave cavity;
s004: synchronously moving the first rod core and the second rod core downwards, wherein the first rod core passes through the first rod core through hole and is inserted into the first rod core accommodating groove, and the second rod core passes through the second rod core through hole and is inserted into the second rod core accommodating groove;
s005: moving the upper punch downwards, and extruding the upper punch and the lower punch to form a connecting rod blank;
s006: and heating, sintering and forging the connecting rod blank to form the piston connecting rod.
Further, in the step S002: the lower die is kept moving in the containing cavity of the middle die.
By adopting the technical scheme, the method has the following beneficial effects:
according to the piston connecting rod, the connecting rod blank forging die and the piston connecting rod manufacturing method, the oil groove blank is formed on the inner surface of the piston pin connecting ring blank at the connecting rod blank stage, and when the connecting rod blank is used for manufacturing the piston connecting rod, the oil groove blank is converted into the oil groove on the inner surface of the piston pin connecting ring and can be used for lubricating the piston pin, so that impact sound between the piston pin and the piston pin connecting ring is reduced, and the lubricating performance is improved.
Drawings
FIG. 1 is a perspective view of a piston rod provided in accordance with one embodiment of the present invention;
FIG. 2 is a front view of a piston rod provided in accordance with one embodiment of the present invention;
FIG. 3 is a perspective view of a connecting rod blank provided in accordance with one embodiment of the present invention;
FIG. 4 is a front view of a connecting rod blank provided in accordance with one embodiment of the present invention;
FIG. 5 is a schematic illustration of a connecting rod blank forging die according to an embodiment of the present invention, in which only a portion of the middle die is shown;
FIG. 6 is a cross-sectional view of a connecting rod blank forging die provided in accordance with an embodiment of the present invention;
FIG. 7 is a schematic view of the engagement of the first core, the second core and the connecting rod blank;
FIG. 8 is a schematic view of the arrangement of the middle die, the upper die, the lower die, the first core and the second core;
FIG. 9 is a schematic view showing the arrangement of a middle die, an upper punch die and a lower punch die;
FIG. 10 is a cross-sectional view of a middle mold;
FIG. 11 is a cross-sectional view of the lower die;
fig. 12 is a sectional view of the upper die.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1-4, a piston connecting rod 1 according to an embodiment of the present invention is manufactured from a connecting rod blank 2.
The piston connecting rod 1 includes a rod body 11, a piston pin connecting ring 12 provided at one end of the rod body 11, and a crankshaft connecting ring 13 provided at the other end of the rod body 11.
Two oil grooves 121 are directly formed on the inner surface of the piston pin connecting ring 12, and each oil groove 121 is parallel to the axis of the piston pin connecting ring 12.
Two oil grooves 121 are symmetrically arranged on the left and right sides of the shaft 11.
The piston connecting rod 1 is used to connect the piston and the crankshaft.
The piston connecting rod 1 provided by the invention is manufactured by a connecting rod blank 2, and the connecting rod blank 2 is manufactured into the piston connecting rod 1 by machining.
The connecting rod blank 2 is provided with an oil groove blank 221, and the oil groove 121 is directly formed after machining and polishing.
Specifically, the piston connecting rod 1 includes a rod body 11, a piston pin connecting ring 12, and a crankshaft connecting ring 13. A piston pin connecting ring 12 and a crankshaft connecting ring 13 are oppositely provided at both ends of the shaft 11.
The piston pin connecting ring 12 is intended to be sleeved on a piston pin in the piston, the piston pin connecting ring 12 also being referred to as the small end portion.
The crankshaft connecting ring 13 is used for being sleeved on a crankshaft, the crankshaft drives a piston to reciprocate through the piston connecting rod 1, and the crankshaft connecting ring 13 is also called as a large head part.
Two oil grooves 121 are directly formed on the inner surface or inner annular surface of the piston pin connecting ring 12, the two oil grooves 121 are symmetrically arranged with one diameter of the piston pin connecting ring 12, and the two oil grooves 121 are symmetrically arranged on the left and right sides of the shaft 11.
Oil groove 121 penetrates both side end surfaces of piston pin connecting ring 12, and the extending direction of oil groove 121 is parallel to the axis of piston pin connecting ring 12, so oil groove 121 is a straight oil groove.
The piston pin connecting ring blank 22 is provided on the connecting rod blank 2 corresponding to the piston pin connecting ring 12, two oil groove blanks 221 are provided on the inner surface or inner annular surface of the piston pin connecting ring blank 22, and when the connecting rod blank 2 is machined into the piston connecting rod 1, the oil groove blanks 221 become the oil grooves 121.
According to the piston connecting rod 1 provided by the invention, the straight oil groove structure (the oil groove 121) is additionally arranged at the small end position of the connecting rod without the bushing, so that the engine oil supply condition at the small end position of the connecting rod can be improved during the running of an engine, and the NVH (noise vibration harshness) characteristic can be improved.
The connecting rod with the straight oil groove in the piston pin connecting ring 12 is formed in the blank stage, the oil groove blank 221 is added in the blank stage, the straight oil groove structure is still reserved in the hole of the piston pin connecting ring 12 after machining and is the oil groove 121, the purpose of increasing the engine oil lubricating condition of the small end of the connecting rod and controlling noise is achieved, design improvement is directly conducted on the existing connecting rod without a lining, similar functions are not needed to be achieved by increasing the mode of arranging the lining with the oil groove, parts are reduced, the cost is reduced, and the reliability is improved.
In one embodiment, the crankshaft connecting ring 12, the shaft 11 and the piston pin connecting ring 13 are integrally formed, and the structural strength is high.
In one embodiment, the connecting rod blank 2 comprises a shaft blank 21 for forming the shaft 11, a piston pin connecting ring blank 22 for forming the piston pin connecting ring 12, and a crankshaft connecting ring blank 23 for forming the crankshaft connecting ring 13;
wherein an oil groove blank 221 for forming the oil groove 121 is directly formed on the inner surface of the piston pin connecting ring blank 22.
After the connecting rod blank 2 is manufactured, the connecting rod blank 2 is machined to manufacture the piston connecting rod 1. Correspondingly, the shank blank 21 becomes the shank 11 in the piston connecting rod 1, the piston pin connecting ring blank 22 becomes the piston pin connecting ring 12 in the piston connecting rod 1, the crankshaft connecting ring blank 23 becomes the crankshaft connecting ring 13 in the piston connecting rod 1, and the oil groove blank 221 becomes the oil groove 121.
At the blank stage, oil groove blank 221 is added into the hole of piston pin connecting ring blank 22, after machining, the straight oil groove structure is still remained in the hole of piston pin connecting ring 12 and is oil groove 121, the straight oil groove structure is used for increasing the engine oil lubricating condition of the small end of the connecting rod and controlling the noise, design improvement can be directly carried out on the existing connecting rod without a bush, similar functions are realized without increasing the mode of arranging the bush with the oil groove, parts are reduced, the cost is reduced, and the reliability is improved.
In one embodiment, the connecting rod blank 2 is formed from metal powder by forging through a connecting rod blank forging die 3. The connecting rod blank 2 is formed by forging and forming the connecting rod blank forging die 3, and the connecting rod blank 2 is formed by directly forging and forming metal powder.
In summary, the oil groove 121 in the piston connecting rod 1 provided by the present invention is implemented by adding the oil groove blank 221 at the blank stage and then polishing, and is not implemented by directly grooving the inner surface of the piston pin connecting ring 12 through machining, and the direct grooving may affect the structural strength of the piston pin connecting ring 12. By adopting the arrangement mode of the invention, the cost can be reduced, and the structural strength of the piston pin connecting ring 12 can not be influenced.
As shown in fig. 5 to 12, an embodiment of the present invention provides a connecting rod blank forging die 3 for forming the aforementioned connecting rod blank 2, including a middle die 31 for defining the outer peripheral profile of the connecting rod blank 2, a lower die 32 for defining the bottom surface profile of the connecting rod blank 2, an upper die 33 for defining the top surface profile of the connecting rod blank 2, a first core 34 for forming the piston pin connecting ring blank 22, and a second core 35 for forming the crankshaft connecting ring blank 23.
A core projection 341 for forming the oil groove blank 221 is provided on the first core rod 34.
The upper die 33 is provided with a first core penetration hole 331 for the first core 34 to pass through, and the lower die 32 is provided with a first core receiving groove 321 for receiving the first core 34.
The upper die 33 is provided with a second core penetration hole 332 for passing the second core 35 therethrough, and the lower die 32 is provided with a second core receiving groove 322 for receiving the second core 35.
The connecting rod blank forging die 3 provided by the invention is mainly used for forming the connecting rod blank 2.
The connecting rod blank forging die 3 includes an intermediate die 31, a lower die 32, an upper die 33, a first core bar 34, and a second core bar 35.
When in use, the connecting rod blank forging die 3 is arranged on a hydraulic press. The middle die 31 is fixed on a hydraulic press machine. The lower die 32 is mounted on a first hydraulic structure (hydraulic cylinder) of the hydraulic machine tool, and the first hydraulic structure drives the lower die 32 to move. The upper die 33 is mounted on a second hydraulic structure (hydraulic cylinder) of the hydraulic machine tool, and the second hydraulic structure drives the upper die 33 to move. The first bar core 34 and the second bar core 35 are mounted on a third hydraulic structure (hydraulic oil cylinder) of the hydraulic machine tool, and the third hydraulic structure drives the first bar core 34 and the second bar core 35 to move synchronously.
The third hydraulic structure may comprise two hydraulic rams, one hydraulic ram being connected to the first bar core 34 and the other hydraulic ram being connected to the second bar core 34, the two hydraulic rams moving synchronously to move the first bar core 34 and the second bar core 35 synchronously.
The third hydraulic structure may also be a hydraulic cylinder provided with a connecting plate, and the first rod core 34 and the second rod core 35 are respectively mounted on the connecting plate to realize synchronous movement.
Wherein the middle die 31 is used for defining the peripheral outline of the connecting rod blank 2. The lower die 32 is used to define the bottom surface profile of the connecting rod blank 2. The upper die 33 serves to define the top surface contour of the connecting rod blank 2. The first core rod 34 is used to form the piston pin connecting ring blank 22, and the first core rod 34 has a core rod protrusion 341 thereon, and the core rod protrusion 341 is used to form the oil groove blank 221. The second core 35 is used to form the crankshaft connecting ring blank 23.
The upper die 33 is provided with a first core punch hole 331 and a second core punch hole 332 for the first core 34 and the second core 35 to pass through, respectively.
The lower die 32 is provided with a first core receiving groove 321 and a second core receiving groove 322 for receiving the first core 34 and the second core 35, respectively.
When processing connecting rod blank 2, will install connecting rod blank forging die 3 earlier and target in place, specifically: the middle die 31 is fixed to a hydraulic machine tool, the lower die 32 is mounted on a first hydraulic structure of the hydraulic machine tool, the upper die 33 is mounted on a second hydraulic structure of the hydraulic machine tool, and the first core bar 34 and the second core bar 35 are mounted on a third hydraulic structure of the hydraulic machine tool.
The lower punch 32 is driven to move upwards and fixed by a second hydraulic structure of the hydraulic machine tool, so that the middle die 31 and the lower punch 32 enclose a cavity 30.
Metal powder is then punched into the cavity 30.
The first core bar 34 and the second core bar 35 are synchronously moved down by the third hydraulic structure of the hydraulic machine tool, the first core bar 34 passes through the first core bar through hole 331 and is inserted into the first core bar receiving groove 321, and the second core bar 35 passes through the second core bar through hole 332 and is inserted into the second core bar receiving groove 322.
After the first core 34 and the second core 35 are in place, the upper die 33 is moved downward by the second hydraulic structure of the hydraulic machine tool, so that the upper die 33 and the lower die 32 are pressed, thereby forming the connecting rod blank 2. Because of the core protrusions 341 on the first core 34, the oil groove blank 221 is formed on the inner annular surface of the piston pin connecting ring blank 22.
And finally, moving the connecting rod blank 2 out of the connecting rod blank forging die 3, and moving the connecting rod blank 2 into a heating furnace for heating and sintering, wherein the heating temperature is 1100-1300 ℃. The furnace may be a controlled atmosphere furnace, such as a box-type controlled atmosphere furnace, comprising: mesh belt type and closed cylinder type.
After the connecting rod blank 2 is heated and sintered, the connecting rod blank 2 is moved to a machining machine tool to be polished, forged and deburred, and finally the piston connecting rod 1 is formed, so that the inner annular surface of the piston pin connecting ring 12 of the piston connecting rod 1 is provided with the oil groove 121.
In one embodiment, as shown in fig. 5 and 7, the cross-section of the rod core protrusions 341 is semi-circular, thereby forming a semi-circular oil groove blank 221 on the inner annular surface of the piston pin connecting ring blank 22, facilitating the subsequent formation of a semi-circular oil groove 121 on the inner annular surface of the piston pin connecting ring 12. The semicircular shape referred to herein means that the cross-section of the core barrel protrusion 341, the oil groove blank 221, or the oil groove 121 is semicircular.
In one embodiment, as shown in fig. 5-12, the middle mold 31 has a receiving cavity 311 therein.
The lower end of the upper die 33 is disposed in the housing cavity 311, and the upper end of the lower die 32 is disposed in the housing cavity 311.
A predetermined gap is left between the lower end of the upper die 33 and the upper end of the lower die 32.
The lower die housing 323 of the lower die 32 is sealingly and slidably connected to the housing chamber wall 312 of the housing chamber 311, and the upper die housing 333 of the upper die 33 is sealingly and slidably connected to the housing chamber wall 312 of the housing chamber 311.
The containing cavity 311 is a through hole, the upper die 33 slides into the containing cavity 311 from above, and the lower die 32 slides into the containing cavity 311 from below, so that the upper die 33 and the lower die 32 can press the metal powder in the cavity 30 to extrude the metal powder into the connecting rod blank 2.
The lower die shell 323 and the containing cavity wall 312 can be sealed by a sealing ring and can slide relatively. The upper die housing 333 and the housing chamber wall 312 may be sealed by a seal ring and may slide relative to each other.
In one embodiment, a downwardly convex blank top land forming surface 330 is provided on the bottom surface of the upper die 33 and an upwardly convex blank bottom land forming surface 320 is provided on the top surface of the lower die 32.
The blank top surface forming surface 330 is downwardly convex for forming the top surface of the shaft blank 21. The blank bottom surface molding surface 320 is downwardly convex for molding the bottom surface of the shaft blank 21.
Referring to fig. 1 to 12, an embodiment of the present invention provides a method for manufacturing a piston connecting rod 1 by using the connecting rod blank forging die 3, including the following steps:
s001: and installing a connecting rod blank forging die 3.
S002: the lower die 32 is moved up and fixed, and the middle die 31 and the lower die 32 enclose a cavity 30.
S003: metal powder is punched into the cavity 30.
S004: the first core 34 and the second core 35 are synchronously moved downwards, the first core 34 passes through the first core through hole 331 and is inserted into the first core receiving groove 321, and the second core 35 passes through the second core through hole 332 and is inserted into the second core receiving groove 322.
S005: the upper die 33 is moved down, and the upper die 33 and the lower die 32 are pressed to form the connecting rod blank 2.
S006: and heating, sintering and forging the connecting rod blank 2 to form the piston connecting rod 1.
That is, when processing connecting rod blank 2, install connecting rod blank forging die 3 in place earlier, specifically: the middle die 31 is fixed to a hydraulic machine tool, the lower die 32 is mounted on a first hydraulic structure of the hydraulic machine tool, the upper die 33 is mounted on a second hydraulic structure of the hydraulic machine tool, and the first core bar 34 and the second core bar 35 are mounted on a third hydraulic structure of the hydraulic machine tool.
The lower die 32 is driven by the second hydraulic structure of the hydraulic machine tool to move up and be fixed in the accommodating cavity 311, so that the middle die 31 and the lower die 32 enclose a concave cavity 30.
The metal powder is then punched into the cavity 30 from the top opening of the receiving cavity 311.
The first core bar 34 and the second core bar 35 are synchronously moved down by the third hydraulic structure of the hydraulic machine tool, the first core bar 34 passes through the first core bar through hole 331 and is inserted into the first core bar receiving groove 321, and the second core bar 35 passes through the second core bar through hole 332 and is inserted into the second core bar receiving groove 322.
After the first core 34 and the second core 35 are in place, the upper die 33 is moved downward by the second hydraulic structure of the hydraulic machine tool so that the upper die 33 enters the accommodation chamber 311 and is pressed with the lower die 32, thereby forming the connecting rod blank 2. Because of the core protrusions 341 on the first core 34, the oil groove blank 221 is formed on the inner annular surface of the piston pin connecting ring blank 22.
And finally, moving the connecting rod blank 2 out of the connecting rod blank forging die 3, and moving the connecting rod blank 2 into a heating furnace for heating and sintering, wherein the heating temperature is 1100-1300 ℃. The furnace may be a controlled atmosphere furnace, such as a box-type controlled atmosphere furnace, comprising: mesh belt type and closed cylinder type.
After the connecting rod blank 2 is heated and sintered, the connecting rod blank 2 is moved to a machining machine tool to be polished, forged and deburred, and finally the piston connecting rod 1 is formed, so that the inner annular surface of the piston pin connecting ring 12 of the piston connecting rod 1 is provided with the oil groove 121.
Preferably, in step S002: the lower die 32 is held in the accommodating cavity 311 of the intermediate die 31 for movement.
Before the first core 34 and the second core 35 are in place, the upper punch 33 is separated from the receiving cavity 311 and positioned above the middle mold 31.
A blanking hole is provided at the bottom of the first and second core receiving grooves 321 and 322 of the lower die 32 so that excess powder is extruded from the blanking hole when the first and second cores 34 and 35 are pressed down.
In summary, according to the piston connecting rod, the connecting rod blank forging die and the piston connecting rod manufacturing method provided by the invention, the oil groove blank is formed on the inner surface of the piston pin connecting ring blank at the connecting rod blank stage, and when the piston connecting rod is manufactured by adopting the connecting rod blank, the oil groove blank is converted into the oil groove on the inner surface of the piston pin connecting ring and can be used for lubricating the piston pin, so that the impact sound between the piston pin and the piston pin connecting ring is reduced, and the lubricating performance is improved.
According to the needs, the above technical schemes can be combined to achieve the best technical effect.
The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.

Claims (10)

1. A piston connecting rod (1) is characterized by being manufactured from a connecting rod blank (2);
the piston connecting rod (1) comprises a rod body (11), a piston pin connecting ring (12) arranged at one end of the rod body (11) and a crankshaft connecting ring (13) arranged at the other end of the rod body (11);
two oil grooves (121) are directly formed on the inner surface of the piston pin connecting ring (12), and each oil groove (121) is parallel to the axis of the piston pin connecting ring (12);
the two oil grooves (121) are symmetrically arranged on the left side and the right side of the shaft (11).
2. A piston connecting rod according to claim 1, characterized in that the crankshaft connecting ring (12), the shank (11) and the piston pin connecting ring (13) are integrally formed.
3. A piston connecting rod according to claim 1 or 2, characterized in that the connecting rod blank (2) comprises a shank blank (21) for forming the shank (11), a piston pin connecting ring blank (22) for forming the piston pin connecting ring (12) and a crankshaft connecting ring blank (23) for forming a crankshaft connecting ring (13);
wherein an oil groove blank (221) for forming the oil groove (121) is directly formed on the inner surface of the piston pin connecting ring blank (22).
4. A piston rod according to claim 3, characterized in that the connecting rod blank (2) is forged from metal powder by means of a connecting rod blank forging die (3).
5. A connecting rod blank forging die (3) for forming the connecting rod blank (2) of any one of claims 1 to 4, characterized by comprising a middle die (31) for defining the peripheral contour of the connecting rod blank (2), a lower die (32) for defining the bottom face contour of the connecting rod blank (2), an upper die (33) for defining the top face contour of the connecting rod blank (2), a first core (34) for forming the piston pin connecting ring blank (22), and a second core (35) for forming the crankshaft connecting ring blank (23);
-on the first core rod (34) there is a core rod protrusion (341) for forming the oil groove blank (221);
the upper punch die (33) is provided with a first core through hole (331) for the first core (34) to pass through, and the lower punch die (32) is provided with a first core accommodating groove (321) for accommodating the first core (34);
the upper punch (33) is provided with a second core rod through hole (332) for the second core rod (35) to pass through, and the lower punch (32) is provided with a second core rod accommodating groove (322) for accommodating the second core rod (35).
6. The connecting rod blank forging die of claim 5, wherein the cross-section of the core rod protrusion (341) is semi-circular.
7. The connecting rod blank forging die of claim 5, wherein the middle die (31) has a receiving cavity (311) therein;
the lower end of the upper punch die (33) is arranged in the accommodating cavity (311), and the upper end of the lower punch die (32) is arranged in the accommodating cavity (311);
a preset gap is reserved between the lower end of the upper punch die (33) and the upper end of the lower punch die (32);
the lower die shell (323) of the lower die (32) is in sealed sliding connection with the accommodating cavity wall (312) of the accommodating cavity (311), and the upper die shell (333) of the upper die (33) is in sealed sliding connection with the accommodating cavity wall (312) of the accommodating cavity (311).
8. The connecting rod blank forging die as set forth in claim 7, wherein a downwardly convex blank top surface forming surface (330) is provided on the bottom surface of the upper die (33), and an upwardly convex blank bottom surface forming surface (320) is provided on the top surface of the lower die (32).
9. A piston connecting rod manufacturing method for manufacturing a piston connecting rod (1) according to any one of claims 1 to 4 using the connecting rod blank forging die (3) according to any one of claims 5 to 8, characterized by comprising the steps of:
s001: a connecting rod blank forging die (3) is installed;
s002: the lower punch die (32) moves upwards and is fixed, and a concave cavity (30) is enclosed by the middle die (31) and the lower punch die (32);
s003: punching metal powder into the cavity (30);
s004: synchronously moving the first rod core (34) and the second rod core (35) downwards, wherein the first rod core (34) passes through the first rod core through hole (331) and is inserted into the first rod core accommodating groove (321), and the second rod core (35) passes through the second rod core through hole (332) and is inserted into the second rod core accommodating groove (322);
s005: moving the upper punch die (33) downwards, and extruding the upper punch die (33) and the lower punch die (32) to form a connecting rod blank (2);
s006: and heating, sintering and forging the connecting rod blank (2) to form the piston connecting rod (1).
10. The method of manufacturing a piston connecting rod according to claim 9, wherein in step S002: the lower punch (32) is held in the accommodating cavity (311) of the middle punch (31) to move.
CN202010404377.9A 2020-05-13 2020-05-13 Piston connecting rod, connecting rod blank forging die and piston connecting rod manufacturing method Pending CN111396444A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010404377.9A CN111396444A (en) 2020-05-13 2020-05-13 Piston connecting rod, connecting rod blank forging die and piston connecting rod manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010404377.9A CN111396444A (en) 2020-05-13 2020-05-13 Piston connecting rod, connecting rod blank forging die and piston connecting rod manufacturing method

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Publication Number Publication Date
CN111396444A true CN111396444A (en) 2020-07-10

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2931909Y (en) * 2006-07-21 2007-08-08 重庆隆鑫工业（集团）有限公司 Engine connecting rod structure
CN101084088A (en) * 2004-11-16 2007-12-05 马勒技术公司 Method of manufacturing a connecting rod assembly for an internal combustion engine
CN101090800A (en) * 2004-11-16 2007-12-19 马勒技术公司 Connecting rod assembly for an internal combustion engine and method of manufacturing same
CN101280800A (en) * 2008-04-25 2008-10-08 奇瑞汽车股份有限公司 Engine connecting rod
CN203412721U (en) * 2013-08-08 2014-01-29 东睦新材料集团股份有限公司 Compressor connection rod for refrigerator
CN104128549A (en) * 2014-07-18 2014-11-05 玉溪大红山矿业有限公司 Die for powder forging of automobile connecting rod
CN204234647U (en) * 2014-11-11 2015-04-01 无锡格瑞斯精密机械有限公司 Connecting rod powder forging mold

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101084088A (en) * 2004-11-16 2007-12-05 马勒技术公司 Method of manufacturing a connecting rod assembly for an internal combustion engine
CN101090800A (en) * 2004-11-16 2007-12-19 马勒技术公司 Connecting rod assembly for an internal combustion engine and method of manufacturing same
CN2931909Y (en) * 2006-07-21 2007-08-08 重庆隆鑫工业（集团）有限公司 Engine connecting rod structure
CN101280800A (en) * 2008-04-25 2008-10-08 奇瑞汽车股份有限公司 Engine connecting rod
CN203412721U (en) * 2013-08-08 2014-01-29 东睦新材料集团股份有限公司 Compressor connection rod for refrigerator
CN104128549A (en) * 2014-07-18 2014-11-05 玉溪大红山矿业有限公司 Die for powder forging of automobile connecting rod
CN204234647U (en) * 2014-11-11 2015-04-01 无锡格瑞斯精密机械有限公司 Connecting rod powder forging mold

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