CN102974742B - Processing method of movable fork - Google Patents
Processing method of movable fork Download PDFInfo
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- CN102974742B CN102974742B CN201210299538.8A CN201210299538A CN102974742B CN 102974742 B CN102974742 B CN 102974742B CN 201210299538 A CN201210299538 A CN 201210299538A CN 102974742 B CN102974742 B CN 102974742B
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- 238000003672 processing method Methods 0.000 title claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000005242 forging Methods 0.000 claims abstract description 17
- 238000010791 quenching Methods 0.000 claims abstract description 8
- 230000000171 quenching effect Effects 0.000 claims abstract description 7
- 238000010008 shearing Methods 0.000 claims abstract description 6
- 238000005496 tempering Methods 0.000 claims abstract description 4
- 238000009413 insulation Methods 0.000 claims description 8
- 238000009966 trimming Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 6
- 238000010792 warming Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 238000009826 distribution Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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Abstract
The invention discloses a processing method of a movable fork. The processing method comprises following procedures: a. cylinder-shaped blanks are poured, b. forging procedure: (1) a round bar with a diameter of 32mm is chosen and blanked by utilizing a shearing machine. The length d of a blanking piece after shearing is 80mm; (2) the blanking pieces is put into a medium frequency heating furnace and heated, a heating temperature is from 1120 degrees to 1180 degrees, and heating times are kept from 2.8 minutes to 4.2 minutes; (3) after the procedure two, a wokrpiece is obtained. The middle position of the workpiece is drawn out by using an air hammer, times of drawing out the hammer is from 8 times to 14 times; c. heat treatment procedure: (1) normalizing is carried out, the workpiece which passes through side shearing is heated to from 865 degrees to 875 degrees and kept warm around one hour; (2) quenching is carried out, the workpiece which passes through the normalizing is heated up to from 675 degrees to 685 degrees, kept warm around 30 minutes, continuously heated up to from 905 degrees to 915 degrees and kept warm around two hours; (3) tempering is carried out, and the workpiece which passes through the quenching is heated up to from 570 degrees to 620 degrees and kept warm around 5 hours. The processing method of the movable fork is favorable for a large batch of industrialized production, reducing the phenomena that dirt carrying and insufficient filling happen in the process of the forging, mechanics performance of a product can be further improved, using materials of the product is saved, and service life of a mold is prolonged.
Description
Technical field
The present invention relates to a kind of processing method of shift fork.
Background technology
Shift fork is the vital part on automobile, due to the particularity of its shape and the importance of serviceability thereof, thus adds the difficulty of its forging molding, and the distribution of material and the selection of technique all need careful consideration.For this reason, the reasonable forging method of this forging is developed also quite by paying close attention to both at home and abroad.
At present, the technological process of domestic shift fork forging routine is: heating, blocking, finish-forging, trimming, finishing.The shortcoming of the program is: need large tonnage pressing machine, and energy consumption is large, stock utilization is low, causes forging cost high.The forging produced with the technological process of the program easily occurs that folder is dirty, is not fully filled, and defect percent defective reaches 5%, and raw material availability only has 20-30%, and due to reasons such as overlap are excessive, the life-span of mould is also only about 5000-6000 part.
Summary of the invention
The object of this invention is to provide a kind of processing method of shift fork, make it be beneficial to large batch of industrialized production, and decrease in forging process the phenomenon occurring that folder is dirty, be not fully filled, the mechanical property of product is improved further, save product materials, improve the die life of product.
The technical solution used in the present invention is as follows:
A processing method for shift fork, comprises the following steps:
A, cast cylinder blank step
In cylinder blank, chemical component weight percentage is: C 0.18-0.27%, Mn 1.1-2.0%, Si 0.6-1.2%, V 0.08-0.15%, Ti 0.11-0.2%, Cr 0.8-2.0%, Ni 0.5-1.5%, Mo 0.15 ~ 0.40%, W 0.1-0.8%, Nb 0.05-0.07%, Al 0.15 ~ 0.23%, Cu 0.15 ~ 0.50%, P≤0.030%, S≤0.030%, surplus is Fe and is inevitably mingled with matter; Cylinder blank after moulding by casting is directly added to 600-670 DEG C before not being cooled to 300 DEG C, and insulation 5-6 hour, then heats 900-950 DEG C, insulation 2-3 hour, air cooling or stove cold;
B, forging step
1), select diameter to be 32 mm round steel, utilize cutter to carry out blanking, after shearing, blank length is 80mm;
2), by the blank of step 1) put into intermediate-frequency heating furnace heating, heating-up temperature 1120-1180 DEG C, keep heat time 2.8-4.2min;
3), by step 2) obtain workpiece, utilize the middle part of pneumatic hammer to above-mentioned workpiece to pull out, pulling out hammer number of times is 8-14 time;
4), the workpiece after pulling is put into punch press and carry out entirety flattening;
5), by the workpiece after flattening put on the mould of electric screw press, utilize mould forge hot workpiece; Temperature 900 DEG C, pressure 400T;
6), by the workpiece after forge hot, put into punch press and carry out trimming process;
C, heat treatment step
(1), normalizing, by the workpiece heat after trimming process at 865-875 DEG C, be incubated 1 hours;
(2), quenching: be incubated about 30 minutes at the workpiece after normalizing is warming up to 675-685 DEG C, continue to be warming up to 905-915 DEG C of insulation 2 hours;
(3) tempering: the workpiece after quenching is warmed up to 570-620 DEG C, lower insulation 5 hours;
D, by the workpiece Shot Blasting after heat treatment;
E, the workpiece after ball blast is carried out the process of cold school;
F, the piece packaging that cold school is processed.
Described puts into intermediate-frequency heating furnace heating, heating-up temperature 1150 DEG C by the blank of step 1) in forging step, keeps heat time 4.0min.
In described step a, before the cylinder blank after moulding by casting is not cooled to 300 DEG C, be directly added to 640 DEG C, be incubated 5.5 hours, then heat 930 DEG C, be incubated 2.5 hours, air cooling or stove cold.
Compared with prior art, the inventive method is by heat treatment before forging, forging after-baking twice operation, tensile strength sigma b (MPa): >=780 (110), yield strength σ s (MPa): >=630 (95), percentage elongation δ 5 (%): >=14, contraction percentage of area ψ (%): >=35, blank is made to obtain rational distribution, thus decrease the size of overlap, stock utilization is made to have brought up to 70% from original about 30%, improve 40%, because blank reduces, equipment hitting power also reduces accordingly, the life-span of mould is caused to bring up to 9000 from original 5000, improve nearly about one times.After blank reasonable distribution, due to the minimizing of overlap, metal reflow causes that folder is dirty and forging part sufficient and part is not abundant etc. that phenomenon improves.
Detailed description of the invention
A processing method for shift fork, comprises the following steps:
A, cast cylinder blank step
In cylinder blank, chemical component weight percentage is: C 0.18-0.27%, Mn 1.1-2.0%, Si 0.6-1.2%, V 0.08-0.15%, Ti 0.11-0.2%, Cr 0.8-2.0%, Ni 0.5-1.5%, Mo 0.15 ~ 0.40%, W 0.1-0.8%, Nb 0.05-0.07%, Al 0.15 ~ 0.23%, Cu 0.15 ~ 0.50%, P≤0.030%, S≤0.030%, surplus is Fe and is inevitably mingled with matter; Before cylinder blank after moulding by casting is not cooled to 300 DEG C, be directly added to 640 DEG C, be incubated 5.5 hours, then heat 930 DEG C, be incubated 2.5 hours, air cooling or stove cold;
B, forging step
1), select diameter to be 32 mm round steel, utilize cutter to carry out blanking, after shearing, blank length is 80mm;
2), by the blank of step 1 put into intermediate-frequency heating furnace heating, heating-up temperature 1150 DEG C, keep heat time 4.0min;
3), by step 2) obtain workpiece, utilize the middle part of pneumatic hammer to above-mentioned workpiece to pull out, pulling out hammer number of times is 8-14 time;
4), the workpiece after pulling is put into punch press and carry out entirety flattening;
5), by the workpiece after flattening put on the mould of electric screw press, utilize mould forge hot workpiece; Temperature 900 DEG C, pressure 400T;
6), by the workpiece after forge hot, put into punch press and carry out trimming process;
C, heat treatment step
(1), normalizing, by the workpiece heat after trimming process at 865-875 DEG C, be incubated 1 hours;
(2), quenching: be incubated about 30 minutes at the workpiece after normalizing is warming up to 675-685 DEG C, continue to be warming up to 905-915 DEG C of insulation 2 hours;
(3) tempering: the workpiece after quenching is warmed up to 570-620 DEG C, lower insulation 5 hours;
D, by the workpiece Shot Blasting after heat treatment;
E, the workpiece after ball blast is carried out the process of cold school;
F, the piece packaging that cold school is processed.
Claims (3)
1. a processing method for shift fork, is characterized in that, comprises the following steps:
A, cast cylinder blank step
In cylinder blank, chemical component weight percentage is: C 0.18-0.27%, Mn 1.1-2.0%, Si 0.6-1.2%, V 0.08-0.15%, Ti 0.11-0.2%, Cr 0.8-2.0%, Ni 0.5-1.5%, Mo 0.15 ~ 0.40%, W 0.1-0.8%, Nb 0.05-0.07%, Al 0.15 ~ 0.23%, Cu 0.15 ~ 0.50%, P≤0.030%, S≤0.030%, surplus is Fe and is inevitably mingled with matter; Cylinder blank after moulding by casting is directly heated to 600-670 DEG C before being cooled to 300 DEG C, and insulation 5-6 hour, then is heated to 900-950 DEG C, insulation 2-3 hour, air cooling or stove cold;
B, forging step
1), select diameter to be 32 mm round steel, utilize cutter to carry out blanking, after shearing, blank length is 80mm;
2), by the blank of step 1) put into intermediate-frequency heating furnace heating, heating-up temperature 1120-1180 DEG C, keep heat time 2.8-4.2min;
3), by step 2) obtain workpiece, utilize the middle part of pneumatic hammer to above-mentioned workpiece to pull out, implement this operation 8-14 time;
4), the workpiece after pulling is put into punch press and carry out entirety flattening;
5), by the workpiece after flattening put on the mould of electric screw press, utilize mould forge hot workpiece; Temperature 900 DEG C, pressure 400T;
6), by the workpiece after forge hot, put into punch press and carry out trimming process;
C, heat treatment step
(1), normalizing, by the workpiece heat after trimming process to 865-875 DEG C, be incubated 1 hour;
(2), quench: the workpiece after normalizing is warming up to 675-685 DEG C, is incubated 30 minutes, continues to be warming up to 905-915 DEG C, is incubated 2 hours;
(3), tempering: the workpiece after quenching is warmed up to 570-620 DEG C, is incubated 5 hours;
D, by the workpiece Shot Blasting after heat treatment;
E, the workpiece after ball blast is carried out the process of cold school;
F, the piece packaging that cold school is processed.
2. the processing method of shift fork according to claim 1, is characterized in that: described step 2) in, heating-up temperature is 1150 DEG C, and the maintenance heat time is 4.0min.
3. the processing method of shift fork according to claim 1, is characterized in that: in described step a, before the cylinder blank after moulding by casting is cooled to 300 DEG C, directly be heated to 640 DEG C, be incubated 5.5 hours, then be heated to 930 DEG C, be incubated 2.5 hours, air cooling or stove cold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210299538.8A CN102974742B (en) | 2012-08-22 | 2012-08-22 | Processing method of movable fork |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210299538.8A CN102974742B (en) | 2012-08-22 | 2012-08-22 | Processing method of movable fork |
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| Publication Number | Publication Date |
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| CN102974742A CN102974742A (en) | 2013-03-20 |
| CN102974742B true CN102974742B (en) | 2015-01-21 |
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| CN201210299538.8A Active CN102974742B (en) | 2012-08-22 | 2012-08-22 | Processing method of movable fork |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103846627A (en) * | 2014-02-11 | 2014-06-11 | 马鞍山市恒毅机械制造有限公司 | Manufacturing method for sliding fork for automobile |
| CN104099515B (en) * | 2014-05-15 | 2016-08-24 | 天津市东达伟业机车车辆有限公司 | A kind of steel, its heat treatment steel formed and manufacture method thereof |
| CN104148575B (en) * | 2014-07-24 | 2016-06-22 | 浙江昌利锻造有限公司 | A kind of Forging Technology of shift fork |
| CN104152805A (en) * | 2014-07-25 | 2014-11-19 | 安徽霍山科皖特种铸造有限责任公司 | Alloy steel and thermal treatment method thereof |
| CN105855799A (en) * | 2016-04-21 | 2016-08-17 | 昌利锻造有限公司 | Machining method of axial joint fork |
| CN105855440A (en) * | 2016-04-21 | 2016-08-17 | 昌利锻造有限公司 | Machining method of shifting fork |
| CN107891111B (en) * | 2017-11-14 | 2019-10-11 | 天津职业技术师范大学 | A kind of preparation method and trident bracket of trident bracket |
| CN110423958A (en) * | 2019-07-11 | 2019-11-08 | 湖北文理学院 | A kind of spindle and its processing technology |
| CN111843404A (en) * | 2020-07-15 | 2020-10-30 | 浙江跃进锻造有限公司 | Manufacturing process of automotive steering tie rod arm |
| CN111843403A (en) * | 2020-07-15 | 2020-10-30 | 浙江跃进锻造有限公司 | Manufacturing process of automobile steering knuckle arm |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1474876A (en) * | 1974-02-18 | 1977-05-25 | Peugeot | Forging of metal components |
| US4094183A (en) * | 1975-12-19 | 1978-06-13 | Press- & Stanzwerk Ag | Method of fabricating a substantially U-shaped body and apparatus for the performance thereof |
| CN1500019A (en) * | 2001-03-29 | 2004-05-26 | 昭和电工株式会社 | Closed forging method, forging prodn. system using method, forging die used in method and system, and preform or yoke produced by method and system |
| CN101007378A (en) * | 2007-02-01 | 2007-08-01 | 上海保捷汽车零部件锻压有限公司 | Shifting fork forging method of auto parts |
| CN101670417A (en) * | 2009-09-29 | 2010-03-17 | 重庆凯恩机械制造有限公司 | Steering knuckle forging molding process of heavy truck |
| CN102513488A (en) * | 2011-12-27 | 2012-06-27 | 十堰园钧工贸有限公司 | Precise forging molding method for blank of automobile fork-shaped half shaft |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59121414A (en) * | 1982-12-27 | 1984-07-13 | Toyota Motor Corp | Shift fork |
-
2012
- 2012-08-22 CN CN201210299538.8A patent/CN102974742B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1474876A (en) * | 1974-02-18 | 1977-05-25 | Peugeot | Forging of metal components |
| US4094183A (en) * | 1975-12-19 | 1978-06-13 | Press- & Stanzwerk Ag | Method of fabricating a substantially U-shaped body and apparatus for the performance thereof |
| CN1500019A (en) * | 2001-03-29 | 2004-05-26 | 昭和电工株式会社 | Closed forging method, forging prodn. system using method, forging die used in method and system, and preform or yoke produced by method and system |
| CN101007378A (en) * | 2007-02-01 | 2007-08-01 | 上海保捷汽车零部件锻压有限公司 | Shifting fork forging method of auto parts |
| CN101670417A (en) * | 2009-09-29 | 2010-03-17 | 重庆凯恩机械制造有限公司 | Steering knuckle forging molding process of heavy truck |
| CN102513488A (en) * | 2011-12-27 | 2012-06-27 | 十堰园钧工贸有限公司 | Precise forging molding method for blank of automobile fork-shaped half shaft |
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| CN102974742A (en) | 2013-03-20 |
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Denomination of invention: Processing method of movable fork Effective date of registration: 20200317 Granted publication date: 20150121 Pledgee: Qingyang Anhui rural commercial bank Limited by Share Ltd. Pledgor: CHANGLI FORGING Co.,Ltd. Registration number: Y2020980000787 |
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Denomination of invention: A machining method of moving fork Effective date of registration: 20210326 Granted publication date: 20150121 Pledgee: Industrial and Commercial Bank of China Limited Qingyang sub branch Pledgor: CHANGLI FORGING Co.,Ltd. Registration number: Y2021980002067 |
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Denomination of invention: A processing method of moving fork Effective date of registration: 20220331 Granted publication date: 20150121 Pledgee: Industrial and Commercial Bank of China Limited Qingyang sub branch Pledgor: CHANGLI FORGING Co.,Ltd. Registration number: Y2022980003405 |
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