CN102989944A - Forging method of expansion breaking connecting rod - Google Patents

Forging method of expansion breaking connecting rod Download PDF

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Publication number
CN102989944A
CN102989944A CN2012103009742A CN201210300974A CN102989944A CN 102989944 A CN102989944 A CN 102989944A CN 2012103009742 A CN2012103009742 A CN 2012103009742A CN 201210300974 A CN201210300974 A CN 201210300974A CN 102989944 A CN102989944 A CN 102989944A
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China
Prior art keywords
workpiece
forging
blank
percent
hour
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Application number
CN2012103009742A
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Chinese (zh)
Inventor
杨奎琦
陈正义
张斌
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Changli Forging Co Ltd
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Changli Forging Co Ltd
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Publication date
Application filed by Changli Forging Co Ltd filed Critical Changli Forging Co Ltd
Priority to CN2012103009742A priority Critical patent/CN102989944A/en
Publication of CN102989944A publication Critical patent/CN102989944A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a forging method of an expansion breaking connecting rod. The forging method comprises the following steps of a, cylindrical blank casting: a cylindrical blank comprises the following chemical ingredients in percentage by weight: 0.23 to 0.35 percent of C, 1.4 to 2.0 percent of Mn, 0.8 to 1.5 percent of Si, 0.11 to 0.15 percent of V, 0.8 to 2.0 percent of Cr, 0.7 to 1.5 percent of Bi, 0.21 to 0.8 percent of W, 0.02 to 0.06 percent of Nb, trace quantity to 0.50 percent of Cu, at most 0.034 percent of P, at most of 0.030 percent of S and the balance of Fe and inevitable mixed impurities, the temperature of a blank body formed through casting is lowered to 290 DEG C and is then heated to 650 to 760 DEG C, the heat insulation is carried out for 5 to 6 hours, a furnace is cooled to 280 to 320 DEG C, the heat insulation is carried out for 3 to 5 hours, the blank body is then heated to 650 to 690 DEG C, the heat insulation is carried out for 32 hours, and the blank body is cooled to 400 DEG C at 43 DEG C per hour and is then cooled to 120 DEG C at 20 DEG C per hour. In addition, phenomena of pollution clamp and non-full filling in the forging process are reduced, the mechanical performance of products is further improved, the material consumption of the products is reduced, and the mold service life of the products is prolonged.

Description

A kind of forging method of fractured connecting rod
Technical field
The present invention relates to a kind of forging method of fractured connecting rod.
Background technology
Fractured connecting rod 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 fractured connecting rod 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 a kind of fractured connecting rod, 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.
The technical solution used in the present invention is as follows:
A kind of forging method of fractured connecting rod may further comprise the steps:
A, cast cylinder blank step
Chemical component weight percentage is in the cylinder blank: C 0.23-0.35%, Mn 1.4-2.0%, Si 0.8-1.5%, V 0.11-0.15%, Cr 0.8-2.0%, Bi 0.7-1.5%, W 0.21-0.8%, Nb 0.02-0.06%, Cu trace~0.50%, P≤0.034%, S≤0.030%, surplus are Fe and inevitably are mingled with matter; The base substrate temperature of moulding by casting is down to 290 ℃, is heated to 650-760 ℃ again, is incubated 5-6 hour, and stove is chilled to 280-320 ℃, be incubated 3-5 hour, be heated to again 650-690 ℃, be incubated 32 hours, be cooled to 400 ℃ with 43 ℃/hour, again with 20 ℃/hour, be cooled to 120 ℃;
B, forging step
1), to select diameter be 95 mm round steel, utilizes band sawing machine to carry out blanking, blank length 269.7mm after shearing;
2), the blank of step 1) is put into intermediate-frequency heating furnace heating, heating-up temperature 1120-1180 ℃, keep 19-20min heat time heating time;
3), with step 2) workpiece that obtains, utilize pneumatic hammer that its end is pulled out, pulling out the hammer number of times is 8-14 time;
4), the workpiece other end after will pulling out is put into punch press and is flattened;
5), the workpiece after will flattening puts on the mould of the press that rubs, and utilizes mould forge hot workpiece; 900 ℃ of temperature, pressure 4000T;
6), with the workpiece after the forge hot, put into that punch press is cut edge, hot school processes;
C, Fractional Heat-treatment step
1), the first half of the workpiece behind the hot school is heated to 700 ℃, and air cooling after being incubated 1 hour, the latter half of of workpiece heats to 1150 ℃, and air cooling after being incubated 1 hour;
2), with the workpiece Shot Blasting after the heat treatment;
D, phosphatization process, at normal temperatures with workpiece after showing tremendous enthusiasm closure temperature is 180-200 ℃ of 1-2min, adopt bonderite to process 15-20min, adopt clear water to clean 1-2min, place 78-100 ℃ hot water to process 0.5-1min workpiece;
3), with the piece packaging of Shot Blasting.
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.
It is as follows that mechanical property of the present invention detects data:
Tensile strength sigma b (MPa): 〉=980 (110)
Yield strength σ s (MPa): 〉=830 (95)
Percentage elongation δ 5 (%): 〉=14
Contraction percentage of area ψ (%): 〉=45
Brinell hardness HB=217-269.
 
Description of drawings
Fig. 1 is fractured connecting rod metallographic microstructure figure.
The specific embodiment
A kind of forging method of fractured connecting rod may further comprise the steps:
A, cast cylinder blank step
Chemical component weight percentage is in the cylinder blank: C 0.23-0.35%, Mn 1.6-2.0%, Si 0.8-1.2%, V 0.11-0.15%, Cr 0.8-1.0%, Bi 0.7-1.2%, W 0.61-0.8%, Nb 0.02-0.06%, Cu trace~0.50%, P≤0.034%, S≤0.030%, surplus are Fe and inevitably are mingled with matter; The base substrate temperature of moulding by casting is down to 290 ℃, is heated to 650-760 ℃ again, is incubated 5-6 hour, and stove is chilled to 280-320 ℃, be incubated 3-5 hour, be heated to again 650-690 ℃, be incubated 32 hours, be cooled to 400 ℃ with 43 ℃/hour, again with 20 ℃/hour, be cooled to 120 ℃;
B, forging step
1), to select diameter be 95 mm round steel, utilizes band sawing machine to carry out blanking, blank length 269.7mm after shearing;
2), the blank of step 1) is put into intermediate-frequency heating furnace heating, heating-up temperature 1120-1180 ℃, keep 19-20min heat time heating time;
3), with step 2) workpiece that obtains, utilize pneumatic hammer that its end is pulled out, pulling out the hammer number of times is 8-14 time;
4), the workpiece other end after will pulling out is put into punch press and is flattened;
5), the workpiece after will flattening puts on the mould of the press that rubs, and utilizes mould forge hot workpiece; 900 ℃ of temperature, pressure 4000T;
6), with the workpiece after the forge hot, put into that punch press is cut edge, hot school processes;
C, Fractional Heat-treatment step
1), the first half of the workpiece behind the hot school is heated to 700 ℃, and air cooling after being incubated 1 hour, the latter half of of workpiece heats to 1150 ℃, and air cooling after being incubated 1 hour;
2), with the workpiece Shot Blasting after the heat treatment;
D, phosphatization process, at normal temperatures with workpiece after showing tremendous enthusiasm closure temperature is 180-200 ℃ of 1-2min, adopt bonderite to process 15-20min, adopt clear water to clean 1-2min, place 78-100 ℃ hot water to process 0.5-1min workpiece;
3), with the piece packaging of Shot Blasting.
The blank that forges the step 1 in the step is put into the intermediate-frequency heating furnace heating, and 1150 ℃ of heating-up temperatures keep 19.5min heat time heating time.The blank that forges the step 1 in the step is put into the intermediate-frequency heating furnace heating, and 1150 ℃ of heating-up temperatures keep 19.5min heat time heating time.
Fractured connecting rod metallographic microstructure figure of the present invention is as follows, and the result meets criterion of acceptability.

Claims (2)

1. the forging method of a fractured connecting rod is characterized in that, may further comprise the steps:
A, cast cylinder blank step
Chemical component weight percentage is in the cylinder blank: C 0.23-0.35%, Mn 1.4-2.0%, Si 0.8-1.5%, V 0.11-0.15%, Cr 0.8-2.0%, Bi 0.7-1.5%, W 0.21-0.8%, Nb 0.02-0.06%, Cu trace~0.50%, P≤0.034%, S≤0.030%, surplus are Fe and inevitably are mingled with matter; The base substrate temperature of moulding by casting is down to 290 ℃, is heated to 650-760 ℃ again, is incubated 5-6 hour, and stove is chilled to 280-320 ℃, be incubated 3-5 hour, be heated to again 650-690 ℃, be incubated 32 hours, be cooled to 400 ℃ with 43 ℃/hour, again with 20 ℃/hour, be cooled to 120 ℃;
B, forging step
1), to select diameter be 95 mm round steel, utilizes band sawing machine to carry out blanking, blank length 269.7mm after shearing;
2), the blank of step 1) is put into intermediate-frequency heating furnace heating, heating-up temperature 1120-1180 ℃, keep 19-20min heat time heating time;
3), with step 2) workpiece that obtains, utilize pneumatic hammer that its end is pulled out, pulling out the hammer number of times is 8-14 time;
4), the workpiece other end after will pulling out is put into punch press and is flattened;
5), the workpiece after will flattening puts on the mould of the press that rubs, and utilizes mould forge hot workpiece; 900 ℃ of temperature, pressure 4000T;
6), with the workpiece after the forge hot, put into that punch press is cut edge, hot school processes;
C, Fractional Heat-treatment step
1), the first half of the workpiece behind the hot school is heated to 700 ℃, and air cooling after being incubated 1 hour, the latter half of of workpiece heats to 1150 ℃, and air cooling after being incubated 1 hour;
2), with the workpiece Shot Blasting after the heat treatment;
D, phosphatization process, at normal temperatures with workpiece after showing tremendous enthusiasm closure temperature is 180-200 ℃ of 1-2min, adopt bonderite to process 15-20min, adopt clear water to clean 1-2min, place 78-100 ℃ hot water to process 0.5-1min workpiece;
3), with the piece packaging of Shot Blasting.
2. the forging method of described fractured connecting rod according to claim 1 is characterized in that, the blank that forges the step 1 in the step is put into the intermediate-frequency heating furnace heating, and 1150 ℃ of heating-up temperatures keep 19.5min heat time heating time.
CN2012103009742A 2012-08-22 2012-08-22 Forging method of expansion breaking connecting rod Pending CN102989944A (en)

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Application Number Priority Date Filing Date Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103639648A (en) * 2013-11-18 2014-03-19 浙江跃进机械有限公司 Machining process for internal combustion engine expansion breaking connecting rod
CN104972030A (en) * 2015-06-24 2015-10-14 陈文建 Locomotive connecting rod forging process
CN105057976A (en) * 2015-07-20 2015-11-18 安徽蓝博旺机械集团精密液压件有限责任公司 Method for forging fuel feed pump cover for forklift
CN105420469A (en) * 2015-11-03 2016-03-23 合肥海源机械有限公司 Machining method for high-shearing-force automobile engine connecting rod
CN106756438A (en) * 2016-12-05 2017-05-31 安徽永川电气设备有限公司 A kind of AC low-tension switch cabinet preparation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1955498A (en) * 2005-10-26 2007-05-02 日产自动车株式会社 Non-heat treated steel for connecting rod and connecting rod formed of same
CN101433939A (en) * 2008-10-10 2009-05-20 白城中一精锻股份有限公司 Precision forging technique for cracking connection rod

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1955498A (en) * 2005-10-26 2007-05-02 日产自动车株式会社 Non-heat treated steel for connecting rod and connecting rod formed of same
CN101433939A (en) * 2008-10-10 2009-05-20 白城中一精锻股份有限公司 Precision forging technique for cracking connection rod

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103639648A (en) * 2013-11-18 2014-03-19 浙江跃进机械有限公司 Machining process for internal combustion engine expansion breaking connecting rod
CN104972030A (en) * 2015-06-24 2015-10-14 陈文建 Locomotive connecting rod forging process
CN105057976A (en) * 2015-07-20 2015-11-18 安徽蓝博旺机械集团精密液压件有限责任公司 Method for forging fuel feed pump cover for forklift
CN105420469A (en) * 2015-11-03 2016-03-23 合肥海源机械有限公司 Machining method for high-shearing-force automobile engine connecting rod
CN106756438A (en) * 2016-12-05 2017-05-31 安徽永川电气设备有限公司 A kind of AC low-tension switch cabinet preparation

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Application publication date: 20130327

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