CN202479423U - Mould for forming external gear of gear shaft produced by precision forging - Google Patents
Mould for forming external gear of gear shaft produced by precision forging Download PDFInfo
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- CN202479423U CN202479423U CN201220048957XU CN201220048957U CN202479423U CN 202479423 U CN202479423 U CN 202479423U CN 201220048957X U CN201220048957X U CN 201220048957XU CN 201220048957 U CN201220048957 U CN 201220048957U CN 202479423 U CN202479423 U CN 202479423U
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Abstract
A mould for forming an external gear of a gear shaft produced by precision forging is composed of four sub-moulds which are the same in shape. An inner surface of each sub-mould is a dentoid quarter arc face, a side surface of each sub-mould is a 45-degree inclined plane, the four sub-moulds are combined into the mould for forming the external gear, and the mould for forming the external gear is provided with teeth on an inner surface. The inner surface of each sub-mould of the mould for forming the external gear is divided into a pre-forming section and a shaping section, the number of teeth of the shaping section and the number of teeth of the pre-forming section of the mould for forming the external gear are the same as the number of teeth of a to-be-processed gear shaft, and a module of gear of the pre-forming section is confirmed according to a formula that a diameter of a bar stock is divided by (teeth number minus 2.5). A draft angle of an upper draft inclined plane of the inner surface of each sub-mould is 2 degrees, and a module of gear of the mould for forming the external gear is the same as a module of gear of the to-be-processed gear shaft. The mould for forming the external gear can apply a rotary forging process to production of a gear shaft, and therefore strength and wear-resisting property of the gear shaft are improved. The mould for forming the external gear of the gear shaft produced by precision forging has the advantages of being simple in structure and long in service life.
Description
Technical field
The present invention relates to the production field of gear shaft, specifically is a kind of method that adopts the swaging mode to produce gear shaft.
Background technology
Gear shaft is as drive disk assembly important in the plant equipment, and higher contact load effect is being born at its engagement position during work, serious wear, and gear fatigue damage very easily under the alternate load effect.Therefore, improve gears engaged regional intensity and wearability and just seem particularly important.At present, main extruding or the forging mold of utilizing of gear and gear shaft processing is from axially carrying out pressure forming.The innovation and creation of publication number CN1367051 have proposed a kind of gear precision shaping dies; The discharging section that the feed zone that the gear die cavity of said mould is tilted by tooth top and tooth root, similar with gear part isometrical section, tooth top and tooth root tilt constitutes, and this mould of employing can reduce distortion of materials power in warm extrusion pressure process.The innovation and creation of publication number CN2460237 are through designing cold warm extrusion molding die, and inside and outside circle helical gear simultaneously can be shaped in the one action process.The innovation and creation of publication number CN1868633 and CN1569351 propose through the forward extrusion effect shaping straight spur gear method between seaming chuck and the die, and the profile parameters of the die of forward extrusion mould is identical with the parameter of straight spur gear to be formed in the forming process.The innovation and creation of publication number CN101025225 and CN101214510 adopt backward extrusion technology to be formed separately out the gear member and the blind hole internal gear of fluid drive automotive trannsmission system on cold forging forcing press or hydraulic press.In said two inventions, the shape of the die of cold extrusion die is all corresponding with the outline of gear product.The higher gear of floating cavity die structure formation precision is all adopted in the innovation and creation of publication number CN1593807 and CN201711484, and this mould effectively reduces the load in the forming process, has improved die life.The innovation and creation of publication number CN101284299 have proposed a kind of gear-box planetary gear shaping die, and said mould is made up of upper die and lower die and spiral ejecting mechanism, the bigger helix cylindrical gear of this mould wrought helical angle.The innovation and creation of publication number CN201815618U have proposed a kind of finish forge mould of straight spur gear profile of tooth, and advantage mainly shows the gears engaged intensity height that work efficiency is high, be shaped and.The innovation and creation of publication number CN101031375 have proposed to adopt a plurality of forging molds method of bevel gear that is shaped, and this invention can effectively raise production efficiency through in forming process, accomplishing piercing and shaping die simultaneously and going flash shaping two procedures.The innovation and creation of publication number CN1820891 have improved the fillibility at forming process middle gear crown place through setting up diffluence pass at blank or bearing of die.Aspect the gear shaft shaping; The innovation and creation of publication number CN101332488 and CN101342566 are formed separately angular wheel shaft and the gear shaft that has internal gear through adopting forward extrusion and backward extrusion technology, in the forming process different extrusion dies have been adopted in the shaping of axle and gear respectively.
Above-mentioned traditional moulds exists or is inappropriate for gear shaft and is shaped, the deficiency that perhaps precision and requirement of strength are high, service life is short.
Summary of the invention
Be shaped for overcoming the gear shaft that perhaps is inappropriate for that exists in the prior art, the deficiency that perhaps precision and requirement of strength are high, service life is short the present invention proposes a kind of external gear shaping dies that is used for the precision forging gear shaft.
External gear shaping dies of the present invention is made up of four identical branch moulds of profile, and each minute mould inner surface be 1/4 arc surface of dentation, each minute the side surface of mould be 45 ° inclined-plane, be the external gear shaping dies that inner surface has tooth with the amalgamation of four branch moulds.Described external gear shaping dies each minute mould inner surface be divided into preform section and plastic section two parts, divide the length of mould plastic section to get 70～95% of bar regional diameter to be formed, the length of preform section is got 40～60% of bar regional diameter to be formed.The draft angle on tooth withdrawing pattern inclined-plane is all got 2 ° on each minute mould inner surface.The cone angle of the preform section of said external gear shaping dies is 3.1 °.All the number of teeth with gear shaft to be processed is identical for the number of teeth of the plastic section of said external gear shaping dies and preform section.The modulus of the plastic section of said external gear shaping dies is identical with the modulus of gear shaft to be processed, and the modulus of said external gear shaping dies preform section is confirmed according to bar diameter ÷ (number of teeth-2.5).
The present invention is through designing the gear shaft forging mold, makes the swaging method be applied to gear shaft and is shaped, and makes the gear shaft external gear near surface grain structure after the shaping be streamline distribution, improved the intensity and the anti-wear performance of gear shaft; The microstructure of the inner near axis of gear shaft has then kept the bar original toughness, makes gear shaft can bear bigger impact loading.Compare with conventional tooth wheel shaft forging mold, the present invention is simple in structure, has improved the service life of mould.
With prior art relatively, swaging is a kind of special-purpose production technology of producing accurate axle type part on to the spin-forging machine that hits at many tups.This technology utilization the advantage of axialy symmetric part, the higher forging shaft of precision can be shaped through the rotation of blank gradually.The present invention through gear shaft external gear shaping dies is designed, makes the production of swaging process application in gear shaft on the basis of existing swaging technology.
Description of drawings
Accompanying drawing 2 is axonometric drawings of external gear shaping dies.
Accompanying drawing 3 is structural representations of branch mould.
Accompanying drawing 4 is cutaway views of branch mould.
1. external gear shaping dies 2. preform sections 3. plastic section 4. preform section cone angles
5. tooth 6. withdrawing pattern inclined-planes
The specific embodiment
Embodiment one
Present embodiment is a kind of external gear shaping dies that is used for the precision forging gear shaft.
Like Fig. 2～shown in Figure 5.Described external gear shaping dies 1 is made up of four identical branch moulds of profile, and each minute mould of described external gear shaping dies 1 is bulk, and each minute mould outer surface be the plane, inner surface is 1/4 arc surface of dentation; Each minute, the side surface of mould was 45 ° inclined-plane, made that the right angle cooperates between the side surface of two adjacent branch moulds.With the amalgamation of four branch moulds, make the dentate gyrus cambered surface of four branch moulds be combined into the external gear shaping dies 1 that inner surface has tooth 5.
The inner surface of described external gear shaping dies 1 each minute mould is divided into preform section 2 and plastic section 3 two parts; The length of said plastic section is got 70～95% of bar regional diameter to be formed, and the length of preform section 2 is got 40～60% of bar regional diameter to be formed.In the present embodiment, the length of said preform section 2 and plastic section 3 is respectively 75mm and 132mm; Inner surface in preform section 2 and plastic section 3 all has tooth 5, and the draft angle on the withdrawing pattern inclined-plane 6 of said tooth 5 is 2 °.As shown in Figure 6.
All the number of teeth with gear shaft to be processed is identical with the number of teeth of preform section 2 for the plastic section 3 of said external gear shaping dies; The modulus of the plastic section 3 of said external gear shaping dies is identical with the modulus of gear shaft to be processed; The modulus of said external gear shaping dies preform section 2 is confirmed according to bar 1 diameter ÷ (number of teeth-2.5); In the present embodiment; The modulus of preform section 2 continuously, makes the reference diameter of these preform section 2 inner surface teeth constitute the conical surface between 3～3.33.
Claims (1)
1. external gear shaping dies that is used for the precision forging gear shaft; It is characterized in that; Described external gear shaping dies is made up of four identical branch moulds of profile; And each minute, the inner surface of mould was 1/4 arc surface of dentation, each minute the side surface of mould be 45 ° inclined-plane, be the external gear shaping dies that inner surface has tooth with the amalgamation of four branch moulds; Described external gear shaping dies each minute mould inner surface be divided into preform section and plastic section two parts, divide the length of mould plastic section to get 70～95% of bar regional diameter to be formed, the length of preform section is got 40～60% of bar regional diameter to be formed; The draft angle on tooth withdrawing pattern inclined-plane is all got 2 ° on each minute mould inner surface; The cone angle of the preform section of said external gear shaping dies is 3.1 °; All the number of teeth with gear shaft to be processed is identical for the number of teeth of the plastic section of said external gear shaping dies and preform section; The modulus of the plastic section of said external gear shaping dies is identical with the modulus of gear shaft to be processed, and the modulus of said external gear shaping dies preform section is confirmed according to bar diameter ÷ (number of teeth 1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220048957XU CN202479423U (en) | 2012-02-15 | 2012-02-15 | Mould for forming external gear of gear shaft produced by precision forging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220048957XU CN202479423U (en) | 2012-02-15 | 2012-02-15 | Mould for forming external gear of gear shaft produced by precision forging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202479423U true CN202479423U (en) | 2012-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220048957XU Expired - Fee Related CN202479423U (en) | 2012-02-15 | 2012-02-15 | Mould for forming external gear of gear shaft produced by precision forging |
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| CN (1) | CN202479423U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104525602A (en) * | 2014-12-23 | 2015-04-22 | 开封强力集团锚固技术股份有限公司 | Warm extrusion equipment for metal parts |
| CN105436390A (en) * | 2015-11-03 | 2016-03-30 | 南昌大学 | Precision forming method for straight/helical tooth cylinder gear with corners easy to fill and die |
| CN115591966A (en) * | 2022-09-06 | 2023-01-13 | 重庆旺德福机械有限公司（Cn） | Large modulus straight gear cold extrusion process |
-
2012
- 2012-02-15 CN CN201220048957XU patent/CN202479423U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104525602A (en) * | 2014-12-23 | 2015-04-22 | 开封强力集团锚固技术股份有限公司 | Warm extrusion equipment for metal parts |
| CN105436390A (en) * | 2015-11-03 | 2016-03-30 | 南昌大学 | Precision forming method for straight/helical tooth cylinder gear with corners easy to fill and die |
| CN115591966A (en) * | 2022-09-06 | 2023-01-13 | 重庆旺德福机械有限公司（Cn） | Large modulus straight gear cold extrusion process |
| CN115591966B (en) * | 2022-09-06 | 2023-04-18 | 重庆旺德福机械有限公司 | Cold extrusion process for large modulus straight gear |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121010 Termination date: 20140215 |