CN114309107A - Extrusion forming die for duplicate gear - Google Patents
Extrusion forming die for duplicate gear Download PDFInfo
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- CN114309107A CN114309107A CN202111648617.0A CN202111648617A CN114309107A CN 114309107 A CN114309107 A CN 114309107A CN 202111648617 A CN202111648617 A CN 202111648617A CN 114309107 A CN114309107 A CN 114309107A
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- 238000001125 extrusion Methods 0.000 title claims abstract description 71
- 239000000463 material Substances 0.000 claims description 8
- 230000009977 dual effect Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 11
- 230000007547 defect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000641 cold extrusion Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The invention discloses a duplex gear extrusion forming die which comprises an upper die assembly and a lower die assembly, wherein the upper die assembly comprises an upper die base connected with the output end of a press machine, and a male die fixing plate and a male die are connected below an upper backing plate; the lower die assembly comprises a lower die sleeve, a pressure block, a fixed female die and a rotary female die, wherein the pressure block is positioned at the bottom in the lower die sleeve, and the fixed female die is positioned on the pressure block; the thrust ball bearing is positioned on the periphery of the upper part of the fixed female die for one circle, and a straight gear extrusion groove communicated to the upper surface is formed in the center of the upper part of the fixed female die; the rotary female die is positioned on an upper seat ring of the thrust ball bearing, a coaxial radial ball bearing is arranged on the periphery of the rotary female die, and an inner ring of the rotary female die is provided with a bevel gear extrusion die. The invention adopts forward extrusion and rotary extrusion to form the spur gear and the helical gear part of the dual gear through one-time extrusion, thereby ensuring the forming quality of the gear tooth part of the dual gear, improving the production efficiency and reducing the manufacturing cost of products.
Description
Technical Field
The invention relates to the technical field of metal material extrusion molding, in particular to a duplex gear extrusion molding method and a special extrusion die.
Background
The dual gear is a key part commonly used in the automobile industry, and due to the structural particularity of the dual gear (particularly the dual gear with a combination of helical teeth and straight gears), the existing dual gear forming and processing method has the following technical defects. Such as: zhang Qing Lian et al (precision forging forming process and numerical simulation analysis of duplex gears, volume 17 supplement of China mechanical engineering, 2006, 10) propose a closed die forging forming process of duplex spur gears, and the process has poor tooth profile filling and generates folding defects or insufficient filling. Luojing et al (cold extrusion process of duplex gears, forging technology, 2019, 44 (9): 73-38) proposes an extrusion forming process of upsetting and extruding straight teeth firstly and then extruding helical teeth positively for duplex gears. Luojing et al (research on cold extrusion process of duplex external gears, die technology, 2020, 6: 42-47) propose a process scheme for machining duplex gear helical gears and extruding and forming straight gear parts. In order to overcome the defects of the existing duplex gear processing, the invention provides a technology for finishing the forming of a straight gear and a helical gear of the duplex gear by one-time extrusion, thereby ensuring the forming quality of the gear tooth part of the duplex gear, improving the production efficiency and reducing the manufacturing cost of products.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a duplex gear extrusion forming method and a special extrusion die.
In order to achieve the purpose, the invention adopts the following technical scheme:
a duplex gear extrusion forming die comprises an upper die assembly and a lower die assembly, wherein the upper die assembly extrudes a blank in the lower die assembly;
the upper die assembly comprises an upper die base, a male die fixing plate and a male die, and the male die is fixed at the lower part of the upper die base through the male die fixing plate;
the lower die assembly comprises a lower die sleeve, a pressure block, a fixed female die and a rotary female die, wherein the lower die sleeve is of a cylindrical structure, the pressure block is positioned at the bottom in the lower die sleeve, and the fixed female die is positioned on the pressure block; the thrust ball bearing is positioned on the periphery of the upper part of the fixed female die for one circle, the plane of an upper seat ring of the thrust ball bearing and the upper surface of the fixed female die are positioned on the same plane, the center of the upper part of the fixed female die is provided with a straight gear extrusion groove communicated with the upper surface, and the inner ring of the straight gear extrusion groove is provided with a straight gear extrusion die; the rotary female die is positioned on an upper seat ring of the thrust ball bearing, a coaxial radial ball bearing is arranged on the periphery of the rotary female die, an inner race of the radial ball bearing is connected with the rotary female die, an outer race of the radial ball bearing is connected with the inner wall of a lower die sleeve, an inner ring of the rotary female die is provided with a helical gear extrusion die, and the inner diameter of the helical gear extrusion die is larger than that of a straight gear extrusion die.
As a further preferred scheme, the male die comprises an extrusion surface and a conical body positioned on the lower surface of the extrusion surface, and the male die can be inserted into the through hole in the blank for extrusion.
As a further preferable scheme, the lower part of the lower die sleeve is provided with an annular lower die seat, and the lower die seat is respectively and fixedly connected with the lower die sleeve and the pressure block; and a middle ring is fixedly arranged on the inner wall of the lower die sleeve and is fixedly connected with the fixed female die.
As a further preferable scheme, the rotary concave die is fixedly connected with an inner race of the radial ball bearing; and the lower seat ring of the thrust ball bearing is fixedly connected with the fixed female die.
As a further preferable scheme, the centers of the pressure block and the fixed female die are provided with coaxial through holes, the inner diameter of the through hole in the pressure block is larger than that of the through hole in the fixed female die, the inner diameter of the spur gear extrusion groove is larger than that of the through hole in the center of the fixed female die, a material returning slide block is arranged in the through hole in the center of the fixed female die, and a material returning rod is arranged in the through hole in the center of the pressure block.
The invention provides an extrusion forming method of a duplicate gear, during extrusion forming, a blank to be extruded is placed into a female die, an output shaft of a press machine drives a male die in transmission connection with the output shaft to downwards extrude the blank, the forming of a straight gear part at the lower part of the blank of the duplicate gear is completed through positive extrusion between the male die and a fixed female die, and the forming of a helical gear part at the upper part of the duplicate gear is completed through rotary extrusion between the male die and a rotary female die. The invention adopts forward extrusion and rotary extrusion to form the straight teeth and the helical teeth of the duplicate gear by one-time extrusion, thereby ensuring good forming quality of the gear teeth of the duplicate gear, improving the production efficiency and reducing the manufacturing cost of products.
Drawings
FIG. 1 is a schematic structural view of an embodiment of a duplicate gear extrusion forming die of the present invention;
FIG. 2 is a schematic view of the structure of a blank to be extruded;
FIG. 3 is a schematic view of the structure of the desired part for final forming;
fig. 4 is a schematic view of the male mold structure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As shown in fig. 1, a duplicate gear extrusion forming die comprises an upper die assembly and a lower die assembly, wherein the upper die assembly extrudes a blank in the lower die assembly;
the upper die assembly comprises an upper die base 1, a male die fixing plate 3 and a male die 4, wherein the lower end of the upper die base 1 is detachably connected with an upper backing plate 2, and the male die fixing plate 3 and the male die 4 are connected below the upper backing plate 2;
the lower die assembly comprises a lower die sleeve 12, a pressure block 10, a fixed female die 9 and a rotary female die 5;
the lower die sleeve 12 is of a cylindrical structure, the pressure block 10 is positioned at the bottom in the lower die sleeve 12 for fixing, and the fixed female die 9 is positioned on the pressure block 10 for fixing;
the thrust ball bearing 7 is located on the periphery of the upper portion of the fixed female die 9 in a circle, specifically, an annular step is arranged on the periphery of the upper portion of the fixed female die 9, the thrust ball bearing 7 is located on the step, a lower seat ring of the thrust ball bearing 7 is fixedly connected with the fixed female die 9, the plane of an upper seat ring of the thrust ball bearing 7 and the upper surface of the fixed female die 9 are located on the same plane, a straight gear extrusion groove communicated with the upper surface is formed in the center of the upper portion of the fixed female die 9, and a straight gear extrusion die is arranged on the inner ring of the straight gear extrusion groove;
the rotating female die 5 is positioned on an upper seat ring of a thrust ball bearing 7, a coaxial radial ball bearing 6 is arranged on the periphery of the rotating female die 5, an inner race of the radial ball bearing 6 is fixedly connected with the rotating female die 5, an outer race of the radial ball bearing 6 is in clearance fit with a lower die sleeve 12, an inner ring of the rotating female die 5 is provided with a bevel gear extrusion die, and the inner diameter of the bevel gear extrusion die is larger than that of a straight gear extrusion die.
The male die 4 comprises an extrusion surface 41 and a conical body 42 positioned on the lower surface of the extrusion surface 41, and can be inserted into a through hole in a blank for extrusion, and the conical body 42 exerts a horizontal force outwards from the through hole to prevent the blank from being deformed towards the direction of the through hole due to the resistance of the helical tooth die.
The rotary female die 5 is positioned on the thrust ball bearing 7, the thrust ball bearing 7 plays a main supporting role for the rotary female die 5, the radial ball bearing 6 and the thrust ball bearing 7 jointly provide a rotary environment for the rotary female die 5, so that smooth rotation of the rotary female die is guaranteed under the condition of no resistance, blanks can freely rotate along with the direction of helical teeth when being subjected to the reaction force of the helical teeth, and the forming effect is good.
The lower part of the lower die sleeve 12 is provided with an annular lower die base 13, and the lower die base 13 is respectively fixedly connected with the lower die sleeve 12 and the pressure block 10; the inner wall of the lower die sleeve 12 is fixedly provided with a middle ring 11, the middle ring 11 is fixedly connected with the fixed female die 9, and the middle ring 11 is used for improving the stress condition of the fixed female die in the extrusion process and further prolonging the service life of the fixed female die).
The centers of the pressure block 10 and the fixed female die 9 are provided with coaxial through holes, the inner diameter of the through hole in the pressure block 10 is larger than that of the through hole in the fixed female die 9, the inner diameter of the extrusion groove of the spur gear is larger than that of the center of the fixed female die 9, a material returning slide block 8 is arranged in the through hole in the center of the fixed female die 9, and a material returning rod 14 is arranged in the through hole in the center of the pressure block 10.
The extrusion method comprises the following steps:
1) the prefabricated blank shown in figure 2 is placed into a female die of an extrusion forming die arranged on a press, an output shaft of the press drives a male die in transmission connection with the output shaft to downwards extrude the blank, a blank d0 shown in figure 2 is equal to the diameter of the addendum circle of a helical gear, and a blank d1 shown in figure 2 is equal to the diameter of the addendum circle of a straight gear. As the punch descends, the billet begins to be extruded. As shown in fig. 1, under the extrusion of the male die, the lower end of the blank starts to flow downwards under the restraint of a spur gear extrusion die for fixing the female die, and a dual-gear spur gear tooth profile is formed through forward extrusion; meanwhile, the upper end of the blank can freely rotate due to the fact that the rotating female die can freely rotate, so that the blank starts to flow along the tooth direction of the helical gear extrusion die, the blank keeps not to rotate under pressure, the helical gear extrusion die rotates along helical teeth of the helical gear extrusion die, and the tooth shape of the helical gear of the dual gear is formed through rotary extrusion. Until the desired part as shown in fig. 3 is extruded.
When the helical gear part of blank is forced, its straight-toothed gear part is because the level that has received the straight-toothed gear mould simultaneously to the restraint, and whole blank can not rotate again, consequently, when helical gear part forced forming, can not receive the guide influence of helical gear mould horizontal direction, is rotating by rotating die 5 completely, and the blank can not receive the square effort of helical gear mould to drive its rotation a little, and the skewed tooth after the later stage shaping like this, the tooth's socket shaping is effectual.
2) And after extrusion is finished, in order to prevent the extrusion-molded duplicate gear from being adhered to the inner peripheral surface of the female die, the press machine drives the male die to return, and the linked material returning rod rotates the female die through the material returning slide block to eject the molded part.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The utility model provides a duplicate gear extrusion forming die which characterized in that: the device comprises an upper die assembly and a lower die assembly, wherein the upper die assembly extrudes a blank in the lower die assembly;
the upper die assembly comprises an upper die base (1), a male die fixing plate (3) and a male die (4), and the male die (4) is fixed at the lower part of the upper die base (1) through the male die fixing plate (3);
the lower die assembly comprises a lower die sleeve (12), a pressure block (10), a fixed female die (9) and a rotary female die (5), the lower die sleeve (12) is of a cylindrical structure, the pressure block (10) is positioned at the inner bottom of the lower die sleeve (12), and the fixed female die (9) is positioned on the pressure block (10); the thrust ball bearing (7) is positioned on the periphery of the upper part of the fixed female die (9) in a circle, the plane of an upper seat ring of the thrust ball bearing (7) and the upper surface of the fixed female die (9) are positioned on the same plane, a straight gear extrusion groove communicated with the upper surface is formed in the center of the upper part of the fixed female die (9), and a straight gear extrusion die is arranged on the inner ring of the straight gear extrusion groove; the rotary female die (5) is located on an upper seat ring of a thrust ball bearing (7), a coaxial radial ball bearing (6) is arranged on the periphery of the rotary female die (5), an inner race of the radial ball bearing (6) is connected with the rotary female die (5), an outer race of the radial ball bearing is connected with the inner wall of a lower die sleeve (12), an inner ring of the rotary female die (5) is provided with a bevel gear extrusion die, and the inner diameter of the bevel gear extrusion die is larger than that of a straight gear extrusion die.
2. A twin gear extrusion molding die as set forth in claim 1, wherein: the blank is provided with a through hole therein; the male die (4) comprises an extrusion surface (41) and a conical body (42) positioned on the lower surface of the extrusion surface (41), and can be inserted into a through hole in a blank for extrusion.
3. A twin gear extrusion molding die as set forth in claim 1, wherein: the lower part of the lower die sleeve (12) is provided with an annular lower die base (13), and the lower die base (13) is fixedly connected with the lower die sleeve (12) and the pressure block (10) respectively; the inner wall of the lower die sleeve (12) is fixedly provided with a middle ring (11), and the middle ring (11) is fixedly connected with the fixed female die (9).
4. A twin gear extrusion molding die as set forth in claim 3, wherein: the rotary female die (5) is fixedly connected with an inner race of the radial ball bearing (6); and the lower seat ring of the thrust ball bearing (7) is fixedly connected with the fixed female die (9).
5. A twin gear extrusion molding die as set forth in claim 3, wherein: the center of pressure piece (10) and fixed die (9) has coaxial through-hole, and the internal diameter of through-hole is greater than the internal diameter of through-hole in fixed die (9) in pressure piece (10), and the internal diameter of spur gear extrusion groove is greater than the through-hole at fixed die (9) center, be equipped with material returned slider (8) in the through-hole at fixed die (9) center, be equipped with material returned pole (14) in the through-hole at pressure piece (10) center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111648617.0A CN114309107A (en) | 2021-12-30 | 2021-12-30 | Extrusion forming die for duplicate gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111648617.0A CN114309107A (en) | 2021-12-30 | 2021-12-30 | Extrusion forming die for duplicate gear |
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| Publication Number | Publication Date |
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| CN114309107A true CN114309107A (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111648617.0A Pending CN114309107A (en) | 2021-12-30 | 2021-12-30 | Extrusion forming die for duplicate gear |
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| CN (1) | CN114309107A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115069982A (en) * | 2022-06-27 | 2022-09-20 | 安徽众鑫科技股份有限公司 | Precise forming die for Harvard type dual gear |
| CN115338308A (en) * | 2022-10-17 | 2022-11-15 | 常州明杰重工科技股份有限公司 | Bidirectional compression molding system with titanium alloy electrode extrusion die |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07112234A (en) * | 1993-10-18 | 1995-05-02 | Oooka Giken Kk | Method and apparatus for forging multistep gear |
| CN2460237Y (en) * | 2000-12-26 | 2001-11-21 | 武金有 | Cold-temp. extruding profiling die of internal-external circul helical gear |
| DE102011102288A1 (en) * | 2011-05-23 | 2012-11-29 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Device for manufacturing spur gear that is utilized in e.g. automotive industry for vehicle gear box, has ejector performing screw movement in aperture of cutting plate with linear portion that is rectified for stamper movement |
| CN106424523A (en) * | 2015-07-23 | 2017-02-22 | 德西福格成型技术有限公司 | Gearwheel having an axial undercut |
| CN106734819A (en) * | 2016-12-27 | 2017-05-31 | 山中合金（宁波）有限公司 | The processing mold and its method of a kind of multisection type helical tooth |
| CN208514951U (en) * | 2018-03-08 | 2019-02-19 | 皖西学院 | A kind of cylindric spiral gear twisted multi-leg block mold |
-
2021
- 2021-12-30 CN CN202111648617.0A patent/CN114309107A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07112234A (en) * | 1993-10-18 | 1995-05-02 | Oooka Giken Kk | Method and apparatus for forging multistep gear |
| CN2460237Y (en) * | 2000-12-26 | 2001-11-21 | 武金有 | Cold-temp. extruding profiling die of internal-external circul helical gear |
| DE102011102288A1 (en) * | 2011-05-23 | 2012-11-29 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Device for manufacturing spur gear that is utilized in e.g. automotive industry for vehicle gear box, has ejector performing screw movement in aperture of cutting plate with linear portion that is rectified for stamper movement |
| CN106424523A (en) * | 2015-07-23 | 2017-02-22 | 德西福格成型技术有限公司 | Gearwheel having an axial undercut |
| CN106734819A (en) * | 2016-12-27 | 2017-05-31 | 山中合金（宁波）有限公司 | The processing mold and its method of a kind of multisection type helical tooth |
| CN208514951U (en) * | 2018-03-08 | 2019-02-19 | 皖西学院 | A kind of cylindric spiral gear twisted multi-leg block mold |
Non-Patent Citations (1)
| Title |
|---|
| 轴承行业教材编审委员会: "《轴承行业工人技术理论教材 轴承基本知识》", 中国农业机械出版社, pages: 115 - 101 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115069982A (en) * | 2022-06-27 | 2022-09-20 | 安徽众鑫科技股份有限公司 | Precise forming die for Harvard type dual gear |
| CN115338308A (en) * | 2022-10-17 | 2022-11-15 | 常州明杰重工科技股份有限公司 | Bidirectional compression molding system with titanium alloy electrode extrusion die |
| CN115338308B (en) * | 2022-10-17 | 2023-03-03 | 常州明杰重工科技股份有限公司 | Bidirectional compression molding system with titanium alloy electrode extrusion die |
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Application publication date: 20220412 |