CN107999685B - Forming die and forming method for tooth form of spiral gear - Google Patents
Forming die and forming method for tooth form of spiral gear Download PDFInfo
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- CN107999685B CN107999685B CN201711293490.9A CN201711293490A CN107999685B CN 107999685 B CN107999685 B CN 107999685B CN 201711293490 A CN201711293490 A CN 201711293490A CN 107999685 B CN107999685 B CN 107999685B
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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
- B21K1/00—Making machine elements
- B21K1/28—Making machine elements wheels; discs
- B21K1/30—Making machine elements wheels; discs with gear-teeth
- B21K1/305—Making machine elements wheels; discs with gear-teeth helical
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels
- B21C35/02—Removing or drawing-off work
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention discloses a forming die for a spiral gear tooth form and a forming method thereof, wherein the die comprises a hydraulic mechanism, an upper die mechanism and a lower die mechanism, the upper die mechanism comprises an upper die seat, an upper die and a pressing rod mechanism, a first through hole is formed in the center of the upper die, the pressing rod mechanism comprises a pressing rod and a second power device, the lower die mechanism comprises a lower die seat, a lower die and a push rod mechanism, a containing cavity is formed in the center of the lower die and is used for placing a workpiece to be formed, a spiral tooth slot is formed in the inner wall of the containing cavity, a second through hole is formed in the center of the bottom of the containing cavity, and the push rod mechanism comprises a push rod and a third power device. According to the invention, the mode that the spiral tooth groove is arranged in the lower die is adopted, so that the workpiece to be formed forms a tooth shape in the cold press forming process, and redundant metal materials in the formed tooth shape move towards the middle part of the workpiece to be formed, so that the problem that the rest materials gather towards one end face of the workpiece due to the fact that the spiral tooth groove is arranged in the upper die in the prior art is avoided, and the forming effect is improved.
Description
Technical Field
The invention relates to the technical field of cold extrusion, in particular to a forming die for a spiral gear tooth form and a forming method thereof.
Background
Cold extrusion is a process in which a metal blank is placed in a cold extrusion die cavity (typically a female die), and pressure is applied to the blank at room temperature by a male die fixed to a press, so that plastic deformation of the metal blank occurs to produce a part. Cold extrusion is one of the processing technologies of non-chip and less-chip parts, and is an advanced technological method in metal plastic processing. Spiral bevel gears are an important part in machinery. The parts have complex shapes and are produced by adopting a milling method, and the traditional processing method has the advantages of more working procedures, low production efficiency, high material loss and higher cost, and is difficult to meet the requirement of mass production. The cold extrusion technology has the advantages of high production efficiency, low material consumption, high mechanical properties of products and the like. The application of the high-precision spiral bevel gear to the production of the spiral bevel gear can greatly reduce the production cost, improve the mechanical property of parts and obtain high-quality products with higher dimensional precision and smaller surface roughness. When the taper angle of the spiral bevel gear is larger than 45 degrees, the extrusion piece is only required to be pushed up from bottom to top after the cold extrusion tooth profile is formed. However, when the taper angle of the spiral bevel gear is smaller than 45 degrees, the extrusion piece must be rotated from bottom to top according to the spiral angle of the gear while being ejected from the female die after the cold extrusion tooth profile is formed, so that the extrusion piece can be completely demolded from the female die.
Disclosure of Invention
The invention aims to provide a spiral gear tooth form forming die with simple process, good forming effect and convenient workpiece taking and a forming method thereof, so that the problems of complex process, poor forming effect and workpiece taking difficulty in the prior art are solved.
In order to achieve the above object, the present invention provides the following solutions: the invention provides a spiral gear tooth form forming die which comprises a hydraulic mechanism, an upper die mechanism and a lower die mechanism, wherein the hydraulic mechanism comprises an upper workbench, a lower workbench and a first power device arranged above the upper workbench, the upper die mechanism comprises an upper die holder, an upper die and a pressing rod mechanism, the upper die holder is connected with the upper workbench, the upper die is arranged in the upper die holder, a first through hole is arranged in the center of the upper die, the pressing rod mechanism comprises a pressing rod and a second power device which are connected, the pressing rod penetrates through the first through hole, the second power device is arranged in the upper die holder, the lower die mechanism comprises a lower die holder, a lower die and a push rod mechanism, the lower die is connected with the lower workbench, the lower die is arranged in the lower die holder, a containing cavity is arranged in the center of the lower die, the containing cavity is used for containing a workpiece to be formed, a spiral tooth groove is formed in the inner wall of the containing cavity, a second through hole is arranged in the center of the bottom of the containing cavity, the push rod mechanism comprises a connecting push rod and a third power device which penetrates through the third power device.
Preferably, the first power device, the second power device and the third power device are all hydraulic mechanisms, the first power device is a vertical four-column two-cylinder hydraulic machine, and the second power device and the third power device are all single-column hydraulic cylinders.
Preferably, an upper stepped hole and a lower stepped hole are respectively arranged on the upper surface and the lower surface of the workpiece to be formed, the upper stepped hole is not communicated with the lower stepped hole, the bottom stepped surface of the upper stepped hole is in contact connection with the compression bar, and the bottom stepped surface of the lower stepped hole is in contact connection with the ejector rod.
Preferably, the ejector rod is provided with an ejection lug, the ejection lug is in contact connection with the upper step surface of the lower step hole, the pressing rod is provided with a pressurizing lug, and the pressurizing lug is in contact connection with the upper step surface of the upper step hole.
Preferably, the thickness of the jacking bump is not smaller than the vertical distance between the upper step surface of the lower step hole and the lower surface, and the thickness of the pressurizing bump is not smaller than the vertical distance between the upper step surface of the upper step hole and the upper surface.
Preferably, the diameter of the first through hole is not larger than the diameter of the upper step surface of the upper step hole, the diameter of the second through hole is not larger than the diameter of the upper bottom surface of the lower step hole, and the central axes of the first through hole and the second through hole of the second through hole are coincident.
The invention also provides a method for forming the tooth shape of the spiral gear by using the forming die, which comprises the following steps:
heating the blank to 1100-1200 ℃, upsetting the heated blank under a press to form a cake-shaped upsetting piece, pre-forging the upsetting piece on a pre-forging die to form a pre-forging piece with the shape close to the appearance of a product, and punching the pre-forging piece on a punching die to form a workpiece to be formed, wherein the upper surface and the lower surface of the workpiece are respectively provided with an upper stepped hole and a lower stepped hole;
placing the workpiece to be formed into a containing cavity of a lower die, starting a first power device, wherein the first power device controls an upper workbench to move downwards, an upper die mechanism moves downwards along with the upper workbench, an upper die in the upper die mechanism is contacted with the upper surface of the workpiece to be formed, and meanwhile, a second power device and a third power device are started, respectively control a pressing rod and a top rod to move, and the pressing rod and the top rod are respectively connected with the bottom step surfaces of an upper step hole and a lower step hole in a contact manner;
the first power device controls the upper workbench and the upper die mechanism to continuously move downwards, and the upper die in the upper die mechanism extrudes the workpiece to be formed to form a spiral gear tooth shape.
Preferably, after the work of forming the spiral gear tooth form is completed, the third power device controls the ejector rod to move continuously, and the ejection convex block on the ejector rod ejects the workpiece forming the spiral gear tooth form.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the forming die and the forming method of the spiral gear tooth form, provided by the invention, the mode that the spiral tooth groove is arranged in the lower die is adopted, so that the workpiece to be formed directly forms the tooth form in the cold press forming process, and redundant metal materials in the formed tooth form move to the middle part of the workpiece to be formed (the accommodating cavity of the lower die wraps the workpiece to be formed, so that the circumferential stress of the workpiece is uniform), the problem that the redundant metal materials are gathered towards one end surface of the workpiece due to the arrangement of the spiral tooth groove in the upper die in the prior art is avoided, the forming effect is improved, and the cold press forming process steps are reduced, so that the process is simple; the upper surface and the lower surface of the workpiece to be formed are respectively provided with the upper stepped hole and the lower stepped hole, and the ejector rods and the pressing rods which are in contact with the upper stepped hole and the lower stepped hole are arranged, so that redundant metal materials after tooth shapes are formed can move towards the middle of the workpiece to be formed more easily, the problem that the redundant metal materials gather towards one end face of the workpiece due to the fact that the workpiece to be formed is a central entity in the conventional cold press forming process is avoided, meanwhile, the ejector rods and the pressing rods are in contact with the upper stepped hole and the lower stepped hole, so that the flowing metal materials formed by extrusion in the forming process are uniformly distributed inside the workpiece, and the problems that the flowing metal materials are unevenly distributed and flow out of the workpiece body are avoided.
2. According to the spiral gear tooth form forming die and the forming method thereof, the jacking convex blocks are arranged on the ejector rods and are in contact connection with the upper step surfaces of the lower step holes, and the ejector rods are connected with the third power device, so that after a workpiece is formed, the workpiece can be ejected, and the problems that the workpiece is difficult to take out and is easy to damage due to the fact that the taper of the gear is small are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view showing the overall structure of a mold for forming a tooth form of a helical gear according to the present invention;
FIG. 2 is a schematic diagram showing the connection structure of a pressing rod mechanism in a spiral gear tooth form forming mold of the present invention;
FIG. 3 is a schematic diagram of the connection structure of the ejector rod mechanism in the forming die of the spiral gear tooth form of the invention;
FIG. 4 is a schematic cross-sectional view of a workpiece to be formed in a spiral gear tooth form forming die of the present invention;
the device comprises a 1-upper workbench, a 2-lower workbench, a 3-first power device, a 4-upper die holder, a 5-upper die, a 6-compression bar, a 7-second power device, an 8-lower die holder, a 9-lower die, a 10-ejector rod, a 11-third power device, a 12-workpiece to be molded, a 13-upper stepped hole, a 14-lower stepped hole, a 15-bottom stepped surface, a 16-upper stepped surface, a 17-jacking lug, a 18-pressurizing lug, a 19-upper surface and a 20-lower surface.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a spiral gear tooth form forming die with simple process, good forming effect and convenient workpiece taking and a forming method thereof, so that the problems of complex process, poor forming effect and workpiece taking difficulty in the prior art are solved.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1-4, the invention provides a spiral gear tooth form forming die, which comprises a hydraulic mechanism, an upper die mechanism and a lower die mechanism, wherein the hydraulic mechanism comprises an upper working table 1, a lower working table 2 and a first power device 3 arranged above the upper working table 1, the upper die mechanism comprises an upper die seat 4, an upper die 5 and a pressure bar 6 mechanism, the upper die seat 4 is connected with the upper working table 1, the upper die 5 is arranged in the upper die seat 4, a first through hole is arranged at the center of the upper die 5, the pressure bar 6 mechanism comprises a pressure bar 6 and a second power device 7 which are connected, the pressure bar 6 penetrates through the first through hole, the second power device 7 is arranged in the upper die seat 4, the lower die mechanism comprises a lower die seat 8, a lower die 9 and a push rod 10 mechanism, the lower die seat 8 is connected with the lower working table 2, the lower die 9 is arranged in the lower die seat 8, a containing cavity is arranged at the center of the lower die 9, a spiral tooth groove is arranged on the inner wall of the containing cavity, a second through hole is arranged at the bottom center of the containing cavity, the push rod 10 mechanism comprises a connected 10 and a third power device 11, and a third power device 11 is arranged in the third through hole 11.
When the tooth form forming work is carried out, firstly, the die is in an open die state, namely, the upper workbench 1 and the upper die mechanism move upwards for a certain safety distance, the lower workbench 2 and the lower die mechanism are kept motionless, wherein the upper workbench 1 moves relative to the lower workbench 2, a guide post is arranged between the upper workbench 1 and the lower workbench 2, or the upper workbench 1 is connected with a guide rail pair, and the upper workbench 1 moves up and down along the guide rail; secondly, placing a workpiece 12 to be formed in a containing cavity of a lower die 9, then controlling an upper workbench 1 and an upper die mechanism to move downwards so that the upper die mechanism and the lower die mechanism are combined together to form a die-closed state, at the moment, an upper die 5, a compression bar 6 in the upper die mechanism and a push rod 10 in the lower die mechanism are all in contact with the workpiece 12 to be formed, and the upper die 5 extrudes the workpiece 12 to be formed, so that a metal material flows into a spiral tooth slot of the containing cavity of the lower die 9, and then the workpiece 12 to be formed forms tooth shapes to finish tooth shape forming work; therefore, the invention adopts the mode of arranging the spiral tooth groove in the lower die 9, so that the workpiece 12 to be formed directly forms the tooth shape in the cold press forming process, and redundant metal materials after forming the tooth shape move to the middle part of the workpiece 12 to be formed (the accommodating cavity of the lower die 9 wraps the workpiece 12 to be formed, so that the circumferential stress of the workpiece is uniform), the problem that the redundant metal materials gather to one end surface of the workpiece due to the arrangement of the spiral tooth groove in the upper die 5 in the prior art is avoided, the forming effect is improved, and the cold press forming also reduces the process steps, so that the process is simple.
In the invention, the first power device 3, the second power device 7 and the third power device 11 are all hydraulic mechanisms, the first power device 3 is a vertical four-column two-cylinder hydraulic machine, and the second power device 7 and the third power device 11 are all single-column hydraulic cylinders.
In order to improve the tooth form forming effect and avoid the problem of residual material accumulation in the forming process, the upper surface 19 and the lower surface 20 of the workpiece 12 to be formed are respectively provided with the upper stepped hole 13 and the lower stepped hole 14, the upper stepped hole 13 and the lower stepped hole 14 are not communicated, the bottom stepped surface 15 of the upper stepped hole 13 is in contact connection with the pressing rod 6, and the bottom stepped surface 15 of the lower stepped hole 14 is in contact connection with the pressing rod 10, so that redundant metal materials after tooth form formation can move to the middle part of the workpiece 12 to be formed more easily, the problem that the redundant metal materials are accumulated to one end surface of the workpiece due to the fact that the workpiece 12 to be formed is a central entity in the conventional cold press forming is avoided, meanwhile, the pressing rod 10 and the pressing rod 6 are in contact with the upper stepped hole 13 and the lower stepped hole 14, so that flowing metal materials formed in an extrusion process are uniformly distributed in the workpiece, and the problem that the flowing metal materials are unevenly distributed and flow out of the workpiece body is avoided.
In order to improve the tooth-shaped forming effect and the convenience of taking parts, a jacking lug 17 is arranged on a push rod 10, the jacking lug 17 is in contact connection with an upper step surface 16 of a lower step hole 14, a pressurizing lug 18 is arranged on a pressure rod 6, and the pressurizing lug 18 is in contact connection with the upper step surface 16 of the upper step hole 13; namely, the method that the upper step surfaces 16 of the lower step holes 14 and the upper step holes 13 are respectively contacted with the jacking convex blocks 17 on the ejector rod 10 and the pressurizing convex blocks 18 on the pressure rod 6 is adopted, so that the flowing metal materials formed by extrusion in the forming process are uniformly distributed in the workpiece, and the problem that the flowing metal materials are gathered on the upper step surfaces 16 of the lower step holes 14 and the upper step holes 13 is avoided; meanwhile, the jacking convex blocks 17 are arranged on the ejector rod 10, the jacking convex blocks 17 are in contact connection with the upper stepped surface 16 of the lower stepped hole 14, and the ejector rod 10 is connected with the third power device 11, so that after the workpiece is formed, the workpiece can be ejected, and the problems that the workpiece is difficult to take out and the workpiece is easy to damage due to small gear taper are avoided.
Similarly, in order to avoid the problem that the flowing metal material gathers on the upper stepped surfaces 16 of the lower stepped hole 14 and the upper stepped hole 13, the thickness of the jacking protrusion 17 is not smaller than the vertical distance between the upper stepped surface 16 and the lower surface 20 of the lower stepped hole 14, and the thickness of the pressurizing protrusion 18 is not smaller than the vertical distance between the upper stepped surface 16 and the upper surface 19 of the upper stepped hole 13, namely, by ensuring that the jacking protrusion 17 and the pressurizing protrusion 18 are fully contacted with the respective upper stepped surfaces 16, the flowing metal material extruded in the forming process is uniformly distributed inside the workpiece.
In the invention, the diameter of the first through hole is not larger than the diameter of the upper step surface 16 of the upper step hole 13, preferably, the diameter of the first through hole is equal to the diameter of the upper step surface 16 of the upper step hole 13, the diameter of the second through hole is not larger than the diameter of the upper bottom surface of the lower step hole 14, preferably, the diameter of the second through hole is equal to the diameter of the upper bottom surface of the lower step hole 14, and in order to ensure the uniform distribution of extrusion force and the forming effect, the central axes of the first through hole and the second through hole are coincident.
The method for forming the tooth shape of the spiral gear by using the forming die comprises the following steps:
heating the blank to 1100-1200 ℃, upsetting the heated blank under a press to form a cake-shaped upsetting piece, pre-forging the upsetting piece on a pre-forging die to form a pre-forging piece with the shape close to the appearance of a product, punching the pre-forging piece on a punching die to form a workpiece 12 to be formed, wherein an upper surface 19 and a lower surface 20 of the workpiece are respectively provided with an upper stepped hole 13 and a lower stepped hole 14;
placing a workpiece 12 to be formed into a containing cavity of a lower die 9, starting a first power device 3, controlling an upper workbench 1 to move downwards by the first power device 3, simultaneously enabling an upper die mechanism to move downwards along with the upper workbench 1, enabling an upper die 5 in the upper die mechanism to be in contact with an upper surface 19 of the workpiece 12 to be formed, simultaneously starting a second power device 7 and a third power device 11, respectively controlling a pressing rod 6 and a top rod 10 to move by the second power device 7 and the third power device 11, and enabling the pressing rod 6 and the top rod 10 to be in contact connection with bottom stepped surfaces 15 of an upper stepped hole 13 and a lower stepped hole 14 respectively;
the first power device 3 controls the upper workbench 1 and the upper die mechanism to move downwards continuously, and the upper die 5 in the upper die mechanism extrudes the workpiece 12 to be formed, so that the work of forming the spiral gear tooth shape is completed.
After the tooth shape of the spiral gear is finished, the upper stepped hole 13 and the lower stepped hole 14 are machined through a machine tool, so that the inner hole of the workpiece meets the relevant requirements.
In the invention, after the work of forming the spiral gear tooth shape is finished, the third power device 11 controls the ejector rod 10 to move continuously, and the ejection convex block 17 on the ejector rod 10 ejects the workpiece forming the spiral gear tooth shape.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (4)
1. The forming die for the spiral gear tooth form is characterized by comprising a hydraulic mechanism, an upper die mechanism and a lower die mechanism, wherein the hydraulic mechanism comprises an upper workbench, a lower workbench and a first power device arranged above the upper workbench, the upper die mechanism comprises an upper die seat, an upper die and a pressing rod mechanism, the upper die seat is connected with the upper workbench, the upper die is arranged in the upper die seat, a first through hole is arranged in the center of the upper die, the pressing rod mechanism comprises a pressing rod and a second power device which are connected, the pressing rod penetrates through the first through hole, the second power device is arranged in the upper die seat, the lower die mechanism comprises a lower die seat, a lower die and a push rod mechanism, the lower die seat is connected with the lower workbench, the lower die is arranged in the lower die seat, a containing cavity is arranged in the center of the lower die, a spiral tooth groove is arranged on the inner wall of the containing cavity, a second through hole is arranged in the bottom center of the containing cavity, the push rod mechanism comprises a push rod and a third power device which is connected with the third power device, and the third power device penetrates through the third power device;
the first power device, the second power device and the third power device are all hydraulic mechanisms, the first power device is a vertical four-column two-cylinder hydraulic machine, and the second power device and the third power device are all single-column hydraulic cylinders;
an upper stepped hole and a lower stepped hole are respectively arranged on the upper surface and the lower surface of the workpiece to be formed, the upper stepped hole is not communicated with the lower stepped hole, the bottom stepped surface of the upper stepped hole is in contact connection with the compression bar, and the bottom stepped surface of the lower stepped hole is in contact connection with the ejector rod;
the ejector rod is provided with an ejection lug which is in contact connection with the upper step surface of the lower step hole, the pressing rod is provided with a pressurizing lug which is in contact connection with the upper step surface of the upper step hole;
the thickness of the jacking lug is not smaller than the vertical distance between the upper step surface of the lower step hole and the lower surface, and the thickness of the pressurizing lug is not smaller than the vertical distance between the upper step surface of the upper step hole and the upper surface.
2. The spiral gear tooth form forming die of claim 1, wherein a diameter of the first through hole is not larger than a diameter of an upper step surface of the upper step hole, a diameter of the second through hole is not larger than a diameter of an upper bottom surface of the lower step hole, and central axes of the first through hole and the second through hole coincide.
3. A method for forming a tooth form of a helical gear using the die for forming a tooth form of a helical gear according to any one of claims 1 to 2, comprising the steps of:
heating the blank to 1100-1200 ℃, upsetting the heated blank under a press to form a cake-shaped upsetting piece, placing the cake-shaped upsetting piece on a pre-forging die to perform pre-forging to form a pre-forging piece with the shape close to the appearance of a product, placing the pre-forging piece on a punching die to perform punching to form a workpiece to be formed, wherein the upper surface and the lower surface of the workpiece are respectively provided with an upper stepped hole and a lower stepped hole;
placing the workpiece to be formed into a containing cavity of a lower die, starting a first power device, wherein the first power device controls an upper workbench to move downwards, an upper die mechanism moves downwards along with the upper workbench, an upper die in the upper die mechanism is contacted with the upper surface of the workpiece to be formed, and meanwhile, a second power device and a third power device are started, respectively control a pressing rod and a top rod to move, and the pressing rod and the top rod are respectively connected with the bottom step surfaces of an upper step hole and a lower step hole in a contact manner;
the first power device controls the upper workbench and the upper die mechanism to continuously move downwards, and the upper die in the upper die mechanism extrudes the workpiece to be formed to form a spiral gear tooth-shaped workpiece.
4. A method of forming a helical gear profile according to claim 3, wherein after a helical gear profile workpiece is formed, the third power means controls continued movement of the ejector pin, and the ejector bump on the ejector pin ejects the workpiece forming the helical gear profile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711293490.9A CN107999685B (en) | 2017-12-08 | 2017-12-08 | Forming die and forming method for tooth form of spiral gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711293490.9A CN107999685B (en) | 2017-12-08 | 2017-12-08 | Forming die and forming method for tooth form of spiral gear |
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| CN107999685A CN107999685A (en) | 2018-05-08 |
| CN107999685B true CN107999685B (en) | 2023-07-21 |
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| CN102319759A (en) * | 2011-07-20 | 2012-01-18 | 重庆创精温锻成型有限公司 | Cold extruding method for tooth form opening angle on gear ring of automobile gear-shifting combining gear |
| CN102581208A (en) * | 2012-02-21 | 2012-07-18 | 中国农业大学 | Method for precisely carrying out hot forging on driven spiral bevel gear of automobile rear axle |
| CN104368741A (en) * | 2014-10-17 | 2015-02-25 | 江苏太平洋精锻科技股份有限公司 | Parking lock sheet gear closed type floating cold extrusion die |
| CN104972045A (en) * | 2015-07-09 | 2015-10-14 | 天津天海精密锻造有限公司 | Dual gear forging die and dual gear forging method using same |
| CN206229955U (en) * | 2016-12-06 | 2017-06-09 | 洛阳秦汉精工股份有限公司 | A kind of forged flange mould of easy mold release |
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