CN104723037A - Automotive transmission input shaft composite forming process and forging mold - Google Patents
Automotive transmission input shaft composite forming process and forging mold Download PDFInfo
- Publication number
- CN104723037A CN104723037A CN201510126410.5A CN201510126410A CN104723037A CN 104723037 A CN104723037 A CN 104723037A CN 201510126410 A CN201510126410 A CN 201510126410A CN 104723037 A CN104723037 A CN 104723037A
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- die
- blank
- forging
- profile
- axle portion
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Gears, Cams (AREA)
Abstract
The invention provides an automotive transmission input shaft composite forming process and a forging mold. The automotive transmission input shaft composite forming process includes the steps of firstly, putting a blank in a heating furnace to be subjected to heating and heat preservation, and then rapidly transferring the blank to a cross wedge mill; secondly, milling the blank through the cross wedge mill, milling off the blank in the middle, and forming two symmetrical step shafts after milling off the blank; thirdly, placing the step shafts in a cavity of the forging mold to be forged, and forming the tooth shape and the blind hole structure during forging at the same time; fourthly, conducting normalizing through waste heat of the forged piece; fifthly, machining shaft splines in the forged piece, and conducting thermal processing and other subsequent machining. By means of the forming process, only one time of heating needs to be conducted in the manufacturing process, cross wedge milling and forging processes are sequentially conducted, energy can be saved, and the environment can be protected. In addition, when machining is conducted through the plastic forming method, the material utilization rate can be increased, cost is saved, and the high mechanical performance is achieved.
Description
Technical field
The present invention relates to forming materials technology, refer to a kind of automotive transmission power shaft combined forming process and forge die especially, belong to field of automobile.
Background technology
In recent years, in vehicle traveling process, transmission input shaft is important drive disk assembly, and the gear on power shaft top is connected with gear, and power shaft axle portion spline is connected with engine by clutch.
In prior art, the main process of power shaft is: forging stock-finish turning (boring)-annular knurl key-gear hobbing-carburizing and quenching-cylindrical grinding-roll flute.Owing to adopting the mode of cutting to process, not only machining period is long, and destroys the fibr tissue of metal, thus affects the bending fatigue strength of gear, tooth face contact fatigue strength and wearability, attenuating workpiece service life.
Also the method for cross wedge rolling can be adopted in prior art to process multidiameter blank, but because power shaft top profile of tooth also will carry out machining, this part is the maximum position of workpiece diameter, distortion can not be produced in the operation of rolling, also the effect of grain refinement would not be had, metallicity can be worsened because of heating process on the contrary, thus affect the strength of gear teeth.
In addition, also adopt cold-stamped method to process multidiameter in prior art, but be subject to technique and the contraction percentage of area limit, need Simulation Based On Multi-step to process, and phosphatization saponification process pollutes.
Therefore, adopt prior art processing and manufacturing power shaft, or the gear shaft profile of tooth intensity processed can be made to decrease, or the tooling step of workpiece can be increased considerably, can't eat one's cake and have it.
Summary of the invention
The invention provides a kind of saving material, working (machining) efficiency is high, and the automotive transmission power shaft combined forming process of the mechanical performance that workpiece is excellent can be ensured.
For solving the problems of the technologies described above, embodiments of the invention provide a kind of automotive transmission power shaft combined forming process, comprise the steps:
(1) blank is put into heating furnace heat and be incubated, then rapid blank to be taken out from heating furnace, be transferred to cross wedge rolling machine;
(2) cross wedge rolling machine is adopted to be rolled blank, and separation that blank is broken from middle part, take out rapidly and be transferred to forging press; Described blank forms the multidiameter of two symmetry arrangement after breaking and being separated;
(3) die cavity multidiameter being placed in forge die forges, and forges the profile of tooth of multidiameter end and the blind hole structure of end face, makes profile of tooth and blind hole structure be shaped during forging simultaneously;
(4) take out the forging forged in (3), utilize the waste heat of forging to carry out normalized treatment;
(5) by the forging process shaft portion spline after normalized treatment in (4); Be coated with permeability-reducing admixture in axle portion, and carry out carburizing and quenching, lonneal process; And carry out roll flute, cylindrical grinding technique after the heat treatment.
Wherein, the diameter of described blank is less than described power shaft tooth root diameter of a circle.
Wherein, the cross wedge rolling machine in described (2) is two rod cross wedge rolling machines.
The present invention also provides an automotive transmission power shaft combined shaping forge die, comprising: lower mold body and upper die body;
Described lower mold body offers axle portion die cavity, described axle portion die cavity is for the axle portion of the described power shaft that is shaped;
Described upper die body comprises patrix overcoat, profile of tooth mould and groups of springs; Described profile of tooth mould is arranged in described patrix overcoat;
Also be provided with the turn for accommodating described groups of springs in described patrix overcoat, the two ends of described groups of springs contact with described profile of tooth mould and patrix overcoat respectively, to be pressed in described lower mold body by described profile of tooth mould;
Described upper die body also comprises the upper punch for forging; Described upper punch is arranged in described upper die body, and can slide up and down by relatively described profile of tooth mould, and the lower end of described upper punch is positioned at the die cavity of described profile of tooth mould.
Wherein, described lower mold body comprises: die shoe, axle portion die and lower platen; Described lower platen is fixed on the top of described die shoe, and described axle portion die is fixed on described die shoe.
Wherein, described axle portion die cavity is opened on described axle portion die.
The beneficial effect of technique scheme of the present invention is as follows:
In such scheme, automotive transmission power shaft combined forming process of the present invention, once after heating, carries out cross wedge rolling and Forging Technology successively, not only saves the energy, also do not produce pollution, protect environment.Further, present invention process mainly adopts the method for Plastic Forming to process, and not only can improve stock utilization, cost-saving, and can improve product mechanical performance.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the automotive transmission power shaft combined forming process of embodiments of the invention;
Fig. 2 is cross wedge rolling die expanded view in the automotive transmission power shaft combined forming process of embodiments of the invention;
Fig. 3 is A-A place sectional view in Fig. 2;
Fig. 4 is B-B place sectional view in Fig. 2;
Fig. 5 is C-C place sectional view in Fig. 2;
Fig. 6 is the structure chart of the automotive transmission power shaft combined shaping forge die of embodiments of the invention.
[main element symbol description]
1, power shaft;
11, blind hole structure;
12, profile of tooth;
13, axle portion spline;
2, forging;
3, multidiameter;
4, blank;
8, upper die body;
80, Upper Die-sleeve;
81, tooth die;
82, groups of springs;
85, upper punch;
9, lower mold body;
90, die shoe;
91, axle portion die;
92, lower platen.
Detailed description of the invention
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
As shown in Figure 1, the automotive transmission power shaft combined forming process of embodiments of the invention, for blank 4 being processed into the power shaft 1 of automotive transmission, the material that blank 4 generally adopts is 20CrMnTiH, and its external form is cylindrical; Final finished is output shaft 4, and profile of tooth 12 helical angle of output shaft 4 is 31 °, and normal module is 2.5mm, the number of teeth 21.
Forming technology specifically comprises the steps:
(1) blank 4 is put into heating furnace heat and be incubated, then rapid blank 4 to be taken out from heating furnace, be transferred to cross wedge rolling machine.Blank 4 is heated to 1100 DEG C ± 50 DEG C, and is incubated 20 minutes.
(2) cross wedge rolling machine is adopted to be rolled blank 4, and separation that blank is broken from middle part, take out rapidly and be transferred to forging press; Described blank forms the multidiameter 3 of two symmetry arrangement after breaking and being separated; Cross wedge rolling machine generally adopts two rod cross wedge rolling machine, preferably adopts the two roller cross wedge rolling machine of H630 type.First blank rolling is become the shape of two ends symmetry by cross wedge rolling machine, and by the cutting knife on mould by the cutting ingot of two symmetric shapes separately.
(3) die cavity multidiameter 3 being placed in forge die forges, and forges the profile of tooth 12 of multidiameter end and the blind hole structure 11 of end face, makes profile of tooth 12 and blind hole structure 11 be shaped during forging simultaneously;
(4) take out the forging 2 forged in (3), utilize the waste heat of forging 2 to carry out normalized treatment;
(5) forging 2 after normalized treatment in (4) is processed shaft portion spline 13; After processing shaft portion spline, be coated with permeability-reducing admixture in axle portion, and carry out carburizing and quenching, lonneal process; And carry out roll flute, cylindrical grinding technique after the heat treatment; Thus form final power shaft 1.
The transmission input shaft combined forming process of the embodiment of the present invention, once after heating, carries out cross wedge rolling and Forging Technology successively, can save the energy, protection of the environment.Further, technique of the present invention mainly adopts the method for Plastic Forming to process, and not only can improve stock utilization, cost-saving, and can improve mechanical performance.
On the basis of above-described embodiment, further, when selecting blank before processing, the diameter of blank 4 is less than described power shaft 1 tooth root diameter of a circle.Such selection can make blank 4 less in cross wedge rolling process interrupt face shrinkage factor, and rolling is relatively easy, thus the cross wedge rolling die life-span is higher.
As shown in Fig. 2 to Fig. 5; The present embodiment is carrying out in cross wedge rolling process, and namely in (2), adopt in the cross wedge rolling machine operation of rolling and need to carry out twice wedge, the contraction percentage of area of twice wedge is respectively 75% and 40%.
As Fig. 3, first time plays wedge, and shrinkage factor is 75%, and forming angle α is 18 °, and broadening angle β is 8 °, and segmentation is rolled together, three sections that shaping multidiameter diameter is larger.
As Fig. 4, second time plays the minimum part of forming wedge end diameter, and second time plays wedge, and shrinkage factor is 40%, and forming angle is 28 °, and broadening angle is 8 °.As Fig. 5, mould is designed with a cutting knife, cutting section forming angle 82 °, for being separated by two multidiameters.The rotating speed of cross wedge rolling machine in rolling remains on 8 revs/min.
As Fig. 6, in (3), the mould of the present embodiment comprises: lower mold body 9 and upper die body 8; Described lower mold body 9 offers axle portion die cavity, this axle portion die cavity is used for forming the axle portion 13 of power shaft.The die joint of this mould is in profile of tooth and major axis intersection, makes profile of tooth separate depanning with major axis; Obviously, when the axle portion of blank is positioned at axle portion die cavity, the top of multidiameter 3 be positioned at lower mold body 9 upper surface on.
Wherein, described upper die body 8 comprises patrix overcoat 80, profile of tooth mould 81 and groups of springs 82; Described profile of tooth mould 81 is arranged in patrix overcoat 80.Also be provided with the turn for accommodating described groups of springs 82 in described patrix overcoat 80, the two ends of described groups of springs 82 contact with described profile of tooth mould 81 and patrix overcoat 80 respectively; When mold cavity of the present invention closes, described profile of tooth mould 81 is pressed in described lower mold body 9 by described groups of springs 82.Described turn is used for putting spring group 82, and plays the object of protection groups of springs 82, and for the contraction of control and guidance groups of springs and prolonging direction.
Described upper die body 8 also comprises the upper punch 85 for forging; Described upper punch 85 is arranged in upper die body 8, and can the sliding up and down of relatively described profile of tooth mould 81, and the lower end of described upper punch 85 is positioned at the die cavity of tooth die tool 81.
When power shaft 1 has blind hole 11, described upper punch 85 can also be used for the blind hole structure that is shaped.
Described groups of springs 82 makes profile of tooth mould 81 be in low level, and profile of tooth mould 81 and axle portion die 91 matched moulds make the die cavity of profile of tooth mould 81 close, and in the process of forging, upper punch 85 presses down forges multidiameter 3.Described patrix overcoat 80 fixes with the slide block of forcing press in forging process, plays protection, supports and spacing effect mould.Described lower mold body 9 is fixed on press bench, and the axle portion die cavity that it is arranged is used for axle portion that is accommodating and forging power shaft 1.The wherein floating upper die structure of profile of tooth mould 81, groups of springs 82 and turn composition, groups of springs 82 makes profile of tooth mould 81 be positioned at low level all the time, forms the state of floating downwards.
The mould of the embodiment of the present invention is forged by the axle portion of axle portion die cavity to gear shaft of lower mold body, and profile of tooth mould is pressed on axle portion die by the groups of springs of upper die body; Pressed down by upper punch again, gear shaft is forged completing.In mould of the present invention, due to turn, groups of springs and patrix overcoat composition floating structure, profile of tooth mould is made to be in low level, form first matched moulds and become near closed hollow ring, the process of rear forging, not only increases stock utilization, cost-saving, and its mechanical performance is better than the workpiece of machining.
On the basis of above-described embodiment, described lower mold body 9 comprises: die shoe 90, axle portion die 91 and lower platen 92; Lower platen 92 is fixed on the top of die shoe 90, and axle portion die 91 is fixed on die shoe 90.Concrete, being the moment starting to forge when described profile of tooth mould 81 contacts with described axle portion die, is the moment of having forged when described patrix overcoat 80 contacts with described lower platen 92.Described axle portion die cavity is opened on axle portion die 91
The transmission input shaft combined forming process of the embodiment of the present invention, it is advantageous that:
(1) edging combines, and replaces the operations such as the forging stock in existing technique, finish turning, gear hobbing and boring, saves machining period and raw material to a great extent, cuts down finished cost;
(2) plastic processing method replaces machine-tooled method can ensure that metal streamline is not destroyed, and makes workpiece have good mechanical performance;
(3) carry out two step plastic workings successively after only need once heating, waste heat can carry out normalized treatment, eliminates in existing technique the process of the cooling that repeatedly heats up, saves the energy, emissions reduction, energy-conserving and environment-protective;
(4) because profile of tooth is shaped in forging process, so compare with traditional cross wedge rolling base, the blank being less than root diameter can be adopted to be rolled, and the contraction percentage of area is less, and rolling is relatively easy, and die life is higher.For the power shaft of some tops with blind hole, without the need to drilling operating, and parts of tooth is through forging, and mechanical performance is better.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. an automotive transmission power shaft combined forming process, is characterized in that, comprises the steps:
(1) blank is put into heating furnace heat and be incubated, then rapid blank to be taken out from heating furnace, be transferred to cross wedge rolling machine;
(2) cross wedge rolling machine is adopted to be rolled blank, and separation that blank is broken from middle part, take out rapidly and be transferred to forging press; Described blank forms the multidiameter of two symmetry arrangement after breaking and being separated;
(3) die cavity multidiameter being placed in forge die forges, and forges the profile of tooth of multidiameter end and the blind hole structure of end face, makes profile of tooth and blind hole structure be shaped during forging simultaneously;
(4) take out the forging forged in (3), utilize the waste heat of forging to carry out normalized treatment;
(5) by the forging process shaft portion spline after normalized treatment in (4); Again be coated with permeability-reducing admixture in axle portion, and carry out carburizing and quenching, lonneal process; And carry out roll flute, cylindrical grinding technique after the heat treatment.
2. automotive transmission power shaft combined forming process according to claim 1, is characterized in that, the diameter of described blank is less than described power shaft tooth root diameter of a circle.
3. automotive transmission power shaft combined forming process according to claim 1 and 2, is characterized in that, the cross wedge rolling machine in described (2) is two rod cross wedge rolling machines.
4. a forge die as claimed in claim 1, is characterized in that, comprising: lower mold body and upper die body;
Described lower mold body offers axle portion die cavity, described axle portion die cavity is for the axle portion of the described power shaft that is shaped;
Described upper die body comprises patrix overcoat, profile of tooth mould and groups of springs; Described profile of tooth mould is arranged in described patrix overcoat;
Also be provided with the turn for accommodating described groups of springs in described patrix overcoat, the two ends of described groups of springs contact with described profile of tooth mould and patrix overcoat respectively, to be pressed in described lower mold body by described profile of tooth mould;
Described upper die body also comprises the upper punch for forging; Described upper punch is arranged in described upper die body, and can slide up and down by relatively described profile of tooth mould, and the lower end of described upper punch is positioned at the die cavity of described profile of tooth mould.
5. forge die according to claim 4, is characterized in that, described lower mold body comprises: die shoe, axle portion die and lower platen; Described lower platen is fixed on the top of described die shoe, and described axle portion die is fixed on described die shoe.
6. forge die according to claim 4, is characterized in that, described axle portion die cavity is opened on described axle portion die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510126410.5A CN104723037B (en) | 2015-03-20 | 2015-03-20 | Automotive transmission input shaft combined forming process and forge die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510126410.5A CN104723037B (en) | 2015-03-20 | 2015-03-20 | Automotive transmission input shaft combined forming process and forge die |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104723037A true CN104723037A (en) | 2015-06-24 |
| CN104723037B CN104723037B (en) | 2017-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510126410.5A Expired - Fee Related CN104723037B (en) | 2015-03-20 | 2015-03-20 | Automotive transmission input shaft combined forming process and forge die |
Country Status (1)
| Country | Link |
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| CN (1) | CN104723037B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105945200A (en) * | 2016-06-25 | 2016-09-21 | 山东汇锋传动股份有限公司 | Assembling die for transverse rolled preformed blank of gearbox output shaft |
| CN107282851A (en) * | 2017-07-13 | 2017-10-24 | 安徽众鑫科技股份有限公司 | A kind of preparation method of gearbox J7 output shafts |
| CN109822037A (en) * | 2019-02-22 | 2019-05-31 | 武汉理工大学 | A kind of automobile axle driving gear forging forming technique |
| CN112522498A (en) * | 2020-11-17 | 2021-03-19 | 一汽解放汽车有限公司 | Transmission output shaft heat treatment strengthening process and transmission output shaft |
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| CN1367056A (en) * | 2001-10-30 | 2002-09-04 | 宋玉泉 | Continuous local plastic precision forming device of automobile half axle gear and its process |
| CN102225450A (en) * | 2011-04-15 | 2011-10-26 | 郑州机械研究所 | One-time forming device of cutting pick |
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| CN103341741A (en) * | 2013-06-16 | 2013-10-09 | 吉林大学 | Compound technology for forming drive and driven spiral bevel gear blanks of automobile rear axle main reducing gear |
| CN103433418A (en) * | 2013-07-03 | 2013-12-11 | 中国农业大学 | Precision forging device and method for spiral bevel gear |
| CN103447779A (en) * | 2013-08-09 | 2013-12-18 | 山东温岭精锻科技有限公司 | Drive axle bevel gear forge piece forging process and equipment |
| CN103480786A (en) * | 2013-09-27 | 2014-01-01 | 江苏太平洋精锻科技股份有限公司 | Shaft end bevel gear forging mould |
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2015
- 2015-03-20 CN CN201510126410.5A patent/CN104723037B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1367056A (en) * | 2001-10-30 | 2002-09-04 | 宋玉泉 | Continuous local plastic precision forming device of automobile half axle gear and its process |
| CN102225450A (en) * | 2011-04-15 | 2011-10-26 | 郑州机械研究所 | One-time forming device of cutting pick |
| CN202498092U (en) * | 2012-03-16 | 2012-10-24 | 河南航天精工制造有限公司 | Mould for extrusion forming of tooth parts of tooth-shaped components |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105945200A (en) * | 2016-06-25 | 2016-09-21 | 山东汇锋传动股份有限公司 | Assembling die for transverse rolled preformed blank of gearbox output shaft |
| CN107282851A (en) * | 2017-07-13 | 2017-10-24 | 安徽众鑫科技股份有限公司 | A kind of preparation method of gearbox J7 output shafts |
| CN109822037A (en) * | 2019-02-22 | 2019-05-31 | 武汉理工大学 | A kind of automobile axle driving gear forging forming technique |
| CN112522498A (en) * | 2020-11-17 | 2021-03-19 | 一汽解放汽车有限公司 | Transmission output shaft heat treatment strengthening process and transmission output shaft |
| CN112522498B (en) * | 2020-11-17 | 2022-08-09 | 一汽解放汽车有限公司 | Transmission output shaft heat treatment strengthening process and transmission output shaft |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104723037B (en) | 2017-06-13 |
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