CN102990291A - Forging method of idler shaft for gearbox - Google Patents
Forging method of idler shaft for gearbox Download PDFInfo
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- CN102990291A CN102990291A CN2012102999957A CN201210299995A CN102990291A CN 102990291 A CN102990291 A CN 102990291A CN 2012102999957 A CN2012102999957 A CN 2012102999957A CN 201210299995 A CN201210299995 A CN 201210299995A CN 102990291 A CN102990291 A CN 102990291A
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- idler shaft
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Abstract
The invention discloses a forging method of an idler shaft for a gearbox. The forging method of the idler shaft for the gearbox is characterized by comprising the following steps: a step a of pouring a cylindrical blank material, wherein the cylindrical blank material comprises chemical components, by weight percent: 0.23-0.40% of C, 1.5-2.0% of Mn, 0.6-1.5% of Si, 0.07-0.15% of Fr, 0.2-2.0% of Cr, 0.42-0.8% of W, 0.4-1.0% of Cd, 0.35-0.50% of Cu, no greater than 0.040% of P, no greater than 0.030% of S, and the balance of Fe and inevitable included impurities; and the step a comprises the following steps: decreasing the temperature of blank bodies shaped in a pouring way to 350 DEG C, then heating the blank bodies to 670 to 760 DEG C for 3-5h heat preservation, cooling the blank bodies in a furnace to 300 DEG C for 4h heat preservation, reheating the blank bodies to 650 to 760 DEG C for 17h heat preservation, cooling the blank bodies to 400 DEG C at a speed of 50 DEG C per hour and finally cooling the blank bodies to 140 DEG C at a speed of 20 DEG C per hour; and a step b of forging, wherein the step b comprises the following steps: a step 1 of selectively using 30-diameter round steel and cutting by using a shearing machine, wherein the length of a sheared rough blank piece is 70.3mm; and a step 2 of putting the rough blank piece of the step 1 in an intermediate frequency heating furnace for heating at a heating temperature of 1120 to 1180 DEG C and keeping the heating for 3.6min. The forging method of the idler shaft for the gearbox is beneficial to the large-batch industrial production of the idler shaft for the gearbox; and moreover, the phenomena of dirt inclusion and impossible fullness occurring during the forging process are reduced, the mechanical performance of a product is further improved, the product material is saved and the service life of a die for the product is prolonged.
Description
Technical field
The present invention relates to the forging method of the idler shaft that a kind of gearbox uses.
Background technology
Idler shaft is the vital part on the automobile, because the particularity of its shape and the importance of serviceability thereof, thereby has increased the difficulty of its forging molding, all needs careful consideration in the selection of the distribution of material and technique.For this reason, the reasonable forging method of developing this forging also quite is subjected to domestic and international concern.
At present, the technological process of domestic idler shaft routine is: heating, blocking, finish-forging, finishing.The shortcoming of this scheme is: need large tonnage pressing machine, energy consumption is large, stock utilization is low, causes the forging cost high.With the forging that technological process was produced of this scheme occur easily folder dirty, be not fully filled etc., the defective percent defective reaches 5%, and raw material availability only has 20-30%, owing to reasons such as overlap are excessive, the life-span of mould is also only about 5000-6000 spare.
Summary of the invention
The forging method that the purpose of this invention is to provide the idler shaft that a kind of gearbox uses, make it be beneficial to large batch of industrialized production, and the phenomenon that has reduced appearance folder dirt in the forging process, has been not fully filled, the mechanical property of product is further improved, save product materials, improved the die life of product.
Technical scheme of the present invention is as follows:
The forging method of the idler shaft that a kind of gearbox is used may further comprise the steps:
A, cast cylinder blank step
Chemical component weight percentage is in the cylinder blank: C 0.23-0.40%, Mn 1.5-2.0%, Si 0.6-1.5, Fr 0.07-0.15%, Cr 1.5-2.0%, W 0.42-0.8%, Cd 0.4-1.0%, Cu 0.35～0.50%, P≤0.040%, S≤0.030%, and surplus is Fe and inevitably is mingled with matter; The base substrate temperature of moulding by casting is down to 350 ℃, is heated to 670-760 ℃ again, is incubated 3-5 hour, and stove is chilled to 300 ℃, is incubated 4 hours, is heated to 650-760 ℃ again, is incubated 17 hours, is cooled to 400 ℃ with 50 ℃/hour, again with 20 ℃/hour, is cooled to 140 ℃;
B, forging step
1, selecting diameter is 30 round steel, utilizes cutter to carry out blanking, blank length 70.3mm after shearing;
2, the blank of step 1 is put into the intermediate-frequency heating furnace heating, heating-up temperature 1120-1180 ℃, kept 3.6min heat time heating time;
3, workpiece is put into punch press and carried out jumping-up, jumping-up thickness 40 ± 1mm;
4, with the upset end side of pressure in the workpiece, so that long 60mm, wide 40mm;
5, the workpiece after will the side of pressure is put on the mould that the press that rubs installs, and utilizes mould forge hot workpiece; 900 ℃ of temperature, pressure 400T;
6, with the workpiece after the forge hot, put into that punch press is cut edge, hot school processes;
C, heat treatment
The idler shaft of forging molding is placed the glowing furnace of the first design temperature, the first design temperature is 800 ℃-900 ℃, keep in the glowing furnace temperature that jackshaft is implemented to quench, the temperature retention time scope is 2.2-2.8 hour, and the jackshaft after the heating of quenching is come out of the stove is cooled to temperature≤150 ℃;
Cooled idler shaft is placed the tempering furnace of the second design temperature, and the second design temperature is 560 ℃-650 ℃, keeps in the tempering furnace temperature that jackshaft is implemented tempering, and the temperature retention time scope is 3.2-4.5 hour, with the cooling of coming out of the stove of the jackshaft after the tempering heating;
Through after the temper, head with idler shaft is heated to 320-380 ℃ again, be incubated 4-5 hour, then the cooling processing of spraying, the afterbody of idler shaft is incubated 6-8 hour at 900-1020 ℃, then air cooling, last idler shaft middle part heat again to temperature be 160～190 ℃, be incubated 2-3 hour, put into iron case cooling in heap;
D, with the workpiece Shot Blasting after the heat treatment;
E, with the piece packaging of Shot Blasting.
The head of described idler shaft is heated to 350 ℃, is incubated 4.5 hours, the cooling processing of then spraying, the afterbody of idler shaft is incubated 7 hours, then air cooling at 990 ℃, last idler shaft middle part heat again to temperature be 170 ℃, be incubated 2.5 hours, put into iron case cooling in heap.
The present invention makes it be beneficial to large batch of industrialized production, and has reduced the phenomenon that occurs the folder dirt in the forging process, is not fully filled, and the mechanical property of product is further improved, and has saved product materials, has improved the die life of product.
Of the present invention
PowerPerformance detection data is as follows:
Tensile strength 〉=696Mpa
Yield strength 〉=452 Mpa
Percentage elongation 〉=14%
The contraction percentage of area 〉=45%
Brinell hardness HB=241-273.
The specific embodiment
The forging method of the idler shaft that a kind of gearbox is used may further comprise the steps:
A, cast cylinder blank step
Chemical component weight percentage is in the cylinder blank: C 0.23-0.40%, Mn 1.5-2.0%, Si 0.6-1.5, Fr 0.07-0.15%, Cr 1.5-2.0%, W 0.42-0.8%, Cd 0.4-1.0%, Cu 0.35～0.50%, P≤0.040%, S≤0.030%, and surplus is Fe and inevitably is mingled with matter; The base substrate temperature of moulding by casting is down to 350 ℃, is heated to 670-760 ℃ again, is incubated 3-5 hour, and stove is chilled to 300 ℃, is incubated 4 hours, is heated to 650-760 ℃ again, is incubated 17 hours, is cooled to 400 ℃ with 50 ℃/hour, again with 20 ℃/hour, is cooled to 140 ℃;
B, forging step
1, selecting diameter is 30 round steel, utilizes cutter to carry out blanking, blank length 70.3mm after shearing;
2, the blank of step 1 is put into the intermediate-frequency heating furnace heating, heating-up temperature 1120-1180 ℃, kept 3.6min heat time heating time;
3, workpiece is put into punch press and carried out jumping-up, jumping-up thickness 40 ± 1mm;
4, with the upset end side of pressure in the workpiece, so that long 60mm, wide 40mm;
5, the workpiece after will the side of pressure is put on the mould that the press that rubs installs, and utilizes mould forge hot workpiece; 900 ℃ of temperature, pressure 400T;
6, with the workpiece after the forge hot, put into that punch press is cut edge, hot school processes;
C, heat treatment
The idler shaft of forging molding is placed the glowing furnace of the first design temperature, the first design temperature is 800 ℃-900 ℃, keep in the glowing furnace temperature that jackshaft is implemented to quench, the temperature retention time scope is 2.2-2.8 hour, and the jackshaft after the heating of quenching is come out of the stove is cooled to temperature≤150 ℃;
Cooled idler shaft is placed the tempering furnace of the second design temperature, and the second design temperature is 560 ℃-650 ℃, keeps in the tempering furnace temperature that jackshaft is implemented tempering, and the temperature retention time scope is 3.2-4.5 hour, with the cooling of coming out of the stove of the jackshaft after the tempering heating;
Through after the temper, head with idler shaft is heated to 320-380 ℃ again, be incubated 4-5 hour, then the cooling processing of spraying, the afterbody of idler shaft is incubated 6-8 hour at 900-1020 ℃, then air cooling, last idler shaft middle part heat again to temperature be 160～190 ℃, be incubated 2-3 hour, put into iron case cooling in heap;
D, with the workpiece Shot Blasting after the heat treatment;
E, with the piece packaging of Shot Blasting.
The head of described idler shaft is heated to 350 ℃, is incubated 4.5 hours, the cooling processing of then spraying, the afterbody of idler shaft is incubated 7 hours, then air cooling at 990 ℃, last idler shaft middle part heat again to temperature be 170 ℃, be incubated 2.5 hours, put into iron case cooling in heap.
Claims (2)
1. the forging method of the idler shaft used of a gearbox is characterized in that, may further comprise the steps:
A, cast cylinder blank step
Chemical component weight percentage is in the cylinder blank: C 0.23-0.40%, Mn 1.5-2.0%, Si 0.6-1.5, Fr 0.07-0.15%, Cr 1.5-2.0%, W 0.42-0.8%, Cd 0.4-1.0%, Cu 0.35～0.50%, P≤0.040%, S≤0.030%, and surplus is Fe and inevitably is mingled with matter; The base substrate temperature of moulding by casting is down to 350 ℃, is heated to 670-760 ℃ again, is incubated 3-5 hour, and stove is chilled to 300 ℃, is incubated 4 hours, is heated to 650-760 ℃ again, is incubated 17 hours, is cooled to 400 ℃ with 50 ℃/hour, again with 20 ℃/hour, is cooled to 140 ℃;
B, forging step
Selecting diameter is 30 round steel, utilizes cutter to carry out blanking, blank length 70.3mm after shearing;
The blank of step 1 is put into the intermediate-frequency heating furnace heating, heating-up temperature 1120-1180 ℃, keep 3.6min heat time heating time;
Workpiece is put into punch press carry out jumping-up, jumping-up thickness 40 ± 1mm;
With the upset end side of pressure in the workpiece, so that long 60mm, wide 40mm;
Workpiece behind the pressure side is put on the mould that the press that rubs installs, utilized mould forge hot workpiece; 900 ℃ of temperature, pressure 400T;
With the workpiece after the forge hot, put into that punch press is cut edge, hot school processes;
C, heat treatment
The idler shaft of forging molding is placed the glowing furnace of the first design temperature, the first design temperature is 800 ℃-900 ℃, keep in the glowing furnace temperature that jackshaft is implemented to quench, the temperature retention time scope is 2.2-2.8 hour, and the jackshaft after the heating of quenching is come out of the stove is cooled to temperature≤150 ℃;
Cooled idler shaft is placed the tempering furnace of the second design temperature, and the second design temperature is 560 ℃-650 ℃, keeps in the tempering furnace temperature that jackshaft is implemented tempering, and the temperature retention time scope is 3.2-4.5 hour, with the cooling of coming out of the stove of the jackshaft after the tempering heating;
Through after the temper, head with idler shaft is heated to 320-380 ℃ again, be incubated 4-5 hour, then the cooling processing of spraying, the afterbody of idler shaft is incubated 6-8 hour at 900-1020 ℃, then air cooling, last idler shaft middle part heat again to temperature be 160～190 ℃, be incubated 2-3 hour, put into iron case cooling in heap;
D, with the workpiece Shot Blasting after the heat treatment;
E, with the piece packaging of Shot Blasting.
2. the forging method of the idler shaft used of described gearbox according to claim 1, it is characterized in that, the head of described idler shaft is heated to 350 ℃, is incubated 4.5 hours, the cooling processing of then spraying, the afterbody of idler shaft is at 990 ℃, be incubated 7 hours, air cooling then, last idler shaft middle part heat again to temperature be 170 ℃, be incubated 2.5 hours, put into iron case cooling in heap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102999957A CN102990291A (en) | 2012-08-22 | 2012-08-22 | Forging method of idler shaft for gearbox |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102999957A CN102990291A (en) | 2012-08-22 | 2012-08-22 | Forging method of idler shaft for gearbox |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102990291A true CN102990291A (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102999957A Pending CN102990291A (en) | 2012-08-22 | 2012-08-22 | Forging method of idler shaft for gearbox |
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| CN (1) | CN102990291A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103846633A (en) * | 2014-02-11 | 2014-06-11 | 马鞍山市恒毅机械制造有限公司 | Method of forging idler shaft for gearbox |
| CN104858345A (en) * | 2015-06-03 | 2015-08-26 | 杭州前进锻造有限公司 | Method for die forging of gear box output shaft |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6478024A (en) * | 1987-09-18 | 1989-03-23 | Matsushita Communication Ind | Majority decision device |
| JPH1078024A (en) * | 1996-08-05 | 1998-03-24 | Eaton Corp | Speed changer shaft and manufacture thereof |
| EP1201774A2 (en) * | 2000-10-25 | 2002-05-02 | Gohsyu Corporation | Forging method |
| CN101342566A (en) * | 2008-08-25 | 2009-01-14 | 江苏创一精锻有限公司 | Integral cold forging technique for angular wheel shaft |
| CN101722406A (en) * | 2009-12-31 | 2010-06-09 | 上海新闵重型锻造有限公司 | Method for manufacturing pin shaft through forging |
| CN102424934A (en) * | 2011-11-16 | 2012-04-25 | 东北特殊钢集团有限责任公司 | Manufacturing method of steel forged component of 18CrNiMo7-6 large gear |
| CN102463320A (en) * | 2010-11-11 | 2012-05-23 | 江苏威鹰机械有限公司 | Cold forging precise forming process for mechanical transmission gear shaft |
-
2012
- 2012-08-22 CN CN2012102999957A patent/CN102990291A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6478024A (en) * | 1987-09-18 | 1989-03-23 | Matsushita Communication Ind | Majority decision device |
| JPH1078024A (en) * | 1996-08-05 | 1998-03-24 | Eaton Corp | Speed changer shaft and manufacture thereof |
| EP1201774A2 (en) * | 2000-10-25 | 2002-05-02 | Gohsyu Corporation | Forging method |
| CN101342566A (en) * | 2008-08-25 | 2009-01-14 | 江苏创一精锻有限公司 | Integral cold forging technique for angular wheel shaft |
| CN101722406A (en) * | 2009-12-31 | 2010-06-09 | 上海新闵重型锻造有限公司 | Method for manufacturing pin shaft through forging |
| CN102463320A (en) * | 2010-11-11 | 2012-05-23 | 江苏威鹰机械有限公司 | Cold forging precise forming process for mechanical transmission gear shaft |
| CN102424934A (en) * | 2011-11-16 | 2012-04-25 | 东北特殊钢集团有限责任公司 | Manufacturing method of steel forged component of 18CrNiMo7-6 large gear |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103846633A (en) * | 2014-02-11 | 2014-06-11 | 马鞍山市恒毅机械制造有限公司 | Method of forging idler shaft for gearbox |
| CN104858345A (en) * | 2015-06-03 | 2015-08-26 | 杭州前进锻造有限公司 | Method for die forging of gear box output shaft |
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Application publication date: 20130327 |
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