CN102989951A - Forging method of automotive camshaft - Google Patents

Forging method of automotive camshaft Download PDF

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Publication number
CN102989951A
CN102989951A CN2012102999603A CN201210299960A CN102989951A CN 102989951 A CN102989951 A CN 102989951A CN 2012102999603 A CN2012102999603 A CN 2012102999603A CN 201210299960 A CN201210299960 A CN 201210299960A CN 102989951 A CN102989951 A CN 102989951A
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China
Prior art keywords
camshaft
incubated
cooling
hours
hour
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2012102999603A
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Chinese (zh)
Inventor
杨奎琦
陈正义
张斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Changli Forging Co Ltd
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Changli Forging Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Changli Forging Co Ltd filed Critical Changli Forging Co Ltd
Priority to CN2012102999603A priority Critical patent/CN102989951A/en
Publication of CN102989951A publication Critical patent/CN102989951A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a forging method of an automotive camshaft, which comprises the steps of: a, pouring a cylindrical blank which contains the chemical components of, by weight percent: 0.23-0.40% of C, 1.5-2.3% of Mn, 0.6-0.9% of Si, 0.07-0.15% of Nb, 0.7-1.2 of Cr, 0.42-0.8% of W, 0.4-1.2% of V, 0.4-0.52% of Cu, less than or equal to 0.043% of P, less than or equal to 0.030% of S and the balance: Fe and inevitable impurities, cooling the poured blank to 300 DEG C, then heating to 650-760 DEG C, thermally insulating for 3-5hours, furnace cooling to 300 DEG C, thermally insulating for 4 hours, heating again to 650-760 DEG C, thermally insulating for 17 hours, cooling to 400 DEG C at cooling speed of 50 DEG C/hour and then cooling to 140 DEG C at cooling speed of 20 DEG C/hour; and b, forging: 1, selecting round bar steel with diameter of 30, and blanking through a shear, wherein the length of the sheared rough blank is 70.3mm; and 2, heating the rough blank obtained in step1 in a medium frequency heating furnace at 1,120-1,180 DEG C for 3.6min. The forging method is good for large scale industrial production of the automotive camshafts and reduces the problems of slag inclusion and short shot in the forging process. The mechanical property of the automotive camshaft is further improved, material consumption of the camshaft is reduced and the service life of a die for forging the camshaft is prolonged.

Description

A kind of forging method of automobile camshaft
Technical field
The present invention relates to a kind of forging method of automobile camshaft.
Background technology
Automobile brake camshaft is in the axostylus axostyle upper end serpentine spindle nose that is integrated to be arranged, because brake camshaft is according to the difference of automobile model, the length of its axostylus axostyle is also different, spindle nose must be integrated with axostylus axostyle in addition, adding man-hour, to adjust tooling device according to the length of axostylus axostyle, traditional process one is whole heating, forge bar section and serpentine spindle nose, the 2nd, the spindle nose heating for multiple times is carried out repeatedly forging and molding, these two kinds of methods all exist power consumption high, labour cost has high input, and the material of workpiece is produced transition oxide skin easily, causes spillage of material large.
Summary of the invention
The forging method that the purpose of this invention is to provide a kind of automobile camshaft, make it be beneficial to large batch of industrialized production, and reduced the phenomenon that occurs the folder dirt in the forging process, is 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:
A kind of forging method of automobile camshaft 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 1.5-2.3%, Si 0.6-0.9%, niobium 0.07-0.15%, Cr 0.7-1.2%, W 0.42-0.8%, vanadium 0.4-1.2%, Cu 0.4~0.52%, P≤0.043%, 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 45 ℃/hour, again with 25 ℃/hour, is cooled to 140 ℃;
B, forging step
1, selecting diameter is 30 round steel, utilizes cutter to carry out blanking, blank length 120.3mm after shearing;
2, the blank of step 1 is put into intermediate-frequency heating furnace heating, is begun to forge, final forging temperature is respectively 850 ℃, 1150 ℃, be cooled to 600 ℃ after, be heated to again 900 ℃, oil cooling to 100 ℃ is heated to 700-710 ℃ again, is incubated 3 hours, again water-cooled;
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 head of camshaft is heated to 320-380 ℃, is incubated 4-5 hour, the cooling processing of then spraying, the afterbody of camshaft is incubated 6-8 hour, then air cooling at 920-1020 ℃, last camshaft middle part heat again to temperature be 160~180 ℃, 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 camshaft is heated to 350 ℃, is incubated 4.5 hours, the cooling processing of then spraying, the afterbody of camshaft is incubated 7 hours, then air cooling at 990 ℃, last camshaft middle part heat again to temperature be 170 ℃, be incubated 2.5 hours, put into iron case cooling in heap.
The present invention passes through technique scheme, overall structure is scientific and reasonable, during use, only need the axostylus axostyle with different model, according to length, in axostylus axostyle an actor's rendering of an operatic tune, put into corresponding lining bar, make the upper end be positioned at die cavity with regard to a forging molding, owing to have the adaptability that can regulate different model, during production, it is temperature required only to need once spindle nose to be heated to technique, but just one-shot forming, thus, the traditional handicraft trouble that has reduced heating for multiple times and repeatedly forged, the corresponding energy consumption that reduced, having reduced material consumption and cost drops into, machining accuracy improves greatly, and compared with prior art stock utilization is brought up to more than 90% by present 65%, and power consumption reduces about 70%, recruitment reduces 3/4ths, a machine tool two people operate the malleable workpiece of split run more than 550, improve about 4 times of work efficiency, the good effect highly significant of generation.
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 〉=1024 Mpa
Yield strength 〉=986 Mpa
Percentage elongation 〉=12%
The contraction percentage of area 〉=35%
Brinell hardness HB=217-229.
The specific embodiment
A kind of forging method of automobile camshaft 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 1.5-2.3%, Si 0.6-0.9%, niobium 0.07-0.15%, Cr 0.7-1.2%, W 0.42-0.8%, vanadium 0.4-1.2%, Cu 0.4~0.52%, P≤0.043%, 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 45 ℃/hour, again with 25 ℃/hour, is cooled to 140 ℃;
B, forging step
1, selecting diameter is 30 round steel, utilizes cutter to carry out blanking, blank length 120.3mm after shearing;
2, the blank of step 1 is put into intermediate-frequency heating furnace heating, is begun to forge, final forging temperature is respectively 850 ℃, 1150 ℃, be cooled to 600 ℃ after, be heated to again 900 ℃, oil cooling to 100 ℃ is heated to 700-710 ℃ again, is incubated 3 hours, again water-cooled;
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 head of camshaft is heated to 350 ℃, is incubated 4.5 hours, the cooling processing of then spraying, the afterbody of camshaft is incubated 7 hours at 990 ℃, air cooling then, last camshaft middle part heat again to temperature be 170 ℃, be incubated 2.5 hours, 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.

Claims (2)

1. the forging method of an automobile camshaft 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 1.5-2.3%, Si 0.6-0.9%, niobium 0.07-0.15%, Cr 0.7-1.2%, W 0.42-0.8%, vanadium 0.4-1.2%, Cu 0.4~0.52%, P≤0.043%, 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 45 ℃/hour, again with 25 ℃/hour, is cooled to 140 ℃;
B, forging step
Selecting diameter is 30 round steel, utilizes cutter to carry out blanking, blank length 120.3mm after shearing;
The blank of step 1 is put into intermediate-frequency heating furnace heating, begins to forge, final forging temperature is respectively 850 ℃, 1150 ℃, be cooled to 600 ℃ after, be heated to again 900 ℃, oil cooling to 100 ℃ is heated to 700-710 ℃ again, is incubated 3 hours, again water-cooled;
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 head of camshaft is heated to 320-380 ℃, is incubated 4-5 hour, the cooling processing of then spraying, the afterbody of camshaft is incubated 6-8 hour, then air cooling at 920-1020 ℃, last camshaft middle part heat again to temperature be 160~180 ℃, 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 described automobile camshaft according to claim 1, it is characterized in that, the head of described camshaft is heated to 350 ℃, is incubated 4.5 hours, the cooling processing of then spraying, the afterbody of camshaft is at 990 ℃, be incubated 7 hours, air cooling then, last camshaft middle part heat again to temperature be 170 ℃, be incubated 2.5 hours, put into iron case cooling in heap.
CN2012102999603A 2012-08-22 2012-08-22 Forging method of automotive camshaft Pending CN102989951A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104972277A (en) * 2015-06-29 2015-10-14 安庆市吉安汽车零件锻轧有限公司 Machining technology for transverse rolling cam shaft workblank
CN105014315A (en) * 2015-06-29 2015-11-04 安庆市吉安汽车零件锻轧有限公司 Forging method of camshaft blank
CN106141693A (en) * 2016-08-04 2016-11-23 陕西奥邦锻造有限公司 A kind of automobile front axle production line and processing method
CN106238658A (en) * 2016-08-24 2016-12-21 江苏金源高端装备股份有限公司 A kind of Forging Technology of automobile brake camshaft
CN106825374A (en) * 2016-12-31 2017-06-13 重庆市合川区通用汽车配件制造厂 A kind of camshaft contour forging technique

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09276976A (en) * 1996-04-11 1997-10-28 Mitsubishi Materials Corp Production of cam piece for assembled cam shaft and hot-forging die used for the production
JP4311715B2 (en) * 2003-03-31 2009-08-12 武蔵精密工業株式会社 Method and apparatus for forming camshaft
CN101850399A (en) * 2010-05-14 2010-10-06 付仕忠 Process method for forging brake cam of automobile
CN101869909A (en) * 2010-06-04 2010-10-27 湖北鑫强汽车零部件制造有限公司 Machining technology for cross-wedge-rolling shaft blank
CN101913057A (en) * 2010-07-16 2010-12-15 湖北威风汽车配件股份有限公司 Production method of low-consumable engine camshaft
CN102444573A (en) * 2010-10-11 2012-05-09 上海腾辉锻造有限公司 Method for manufacturing forging pump shaft

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09276976A (en) * 1996-04-11 1997-10-28 Mitsubishi Materials Corp Production of cam piece for assembled cam shaft and hot-forging die used for the production
JP4311715B2 (en) * 2003-03-31 2009-08-12 武蔵精密工業株式会社 Method and apparatus for forming camshaft
CN101850399A (en) * 2010-05-14 2010-10-06 付仕忠 Process method for forging brake cam of automobile
CN101869909A (en) * 2010-06-04 2010-10-27 湖北鑫强汽车零部件制造有限公司 Machining technology for cross-wedge-rolling shaft blank
CN101913057A (en) * 2010-07-16 2010-12-15 湖北威风汽车配件股份有限公司 Production method of low-consumable engine camshaft
CN102444573A (en) * 2010-10-11 2012-05-09 上海腾辉锻造有限公司 Method for manufacturing forging pump shaft

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104972277A (en) * 2015-06-29 2015-10-14 安庆市吉安汽车零件锻轧有限公司 Machining technology for transverse rolling cam shaft workblank
CN105014315A (en) * 2015-06-29 2015-11-04 安庆市吉安汽车零件锻轧有限公司 Forging method of camshaft blank
CN106141693A (en) * 2016-08-04 2016-11-23 陕西奥邦锻造有限公司 A kind of automobile front axle production line and processing method
CN106238658A (en) * 2016-08-24 2016-12-21 江苏金源高端装备股份有限公司 A kind of Forging Technology of automobile brake camshaft
CN106825374A (en) * 2016-12-31 2017-06-13 重庆市合川区通用汽车配件制造厂 A kind of camshaft contour forging technique

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Application publication date: 20130327