CN101433939A - Precision forging technique for cracking connection rod - Google Patents
Precision forging technique for cracking connection rod Download PDFInfo
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- CN101433939A CN101433939A CNA2008100512589A CN200810051258A CN101433939A CN 101433939 A CN101433939 A CN 101433939A CN A2008100512589 A CNA2008100512589 A CN A2008100512589A CN 200810051258 A CN200810051258 A CN 200810051258A CN 101433939 A CN101433939 A CN 101433939A
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Abstract
The invention relates to a precision forging technique for a cracking connecting rod, which relates to improvement of a manufacturing technique for automobile parts. The precision forging technique comprises the following steps: a. precise shearing and charging; b. medium-frequency induction heating; c. forging of a billet through a multi-process step roll; d. precision die forging; e. edge-cutting and correction through a press; f. air cooling treatment; g. ball blasting treatment; h. CSD detection; j. fluorescent flaw detection; k. pressure sizing through screw press; l. weighing through an automatic weighing instrument; and m. final inspection. The precision forging technique has the advantages that compared with the prior forging technique, the precision forging technique can improve the production efficiency of forged pieces by approximately one fold, save 40 percent of energy resources and 20 percent of auxiliary raw materials, simplify the cold processing technique, reduce the investment of cold processing equipment by 25 percent, shorten the length of the production line, reduce the floor space by 30 percent, greatly reduce the production cost, obviously improve the strength and the assembly precision of the connecting rod, improve the reliability and the economical efficiency of use of light automobile engines, and reduce the rejection rate of the forged pieces by 50 percent.
Description
Technical field
The invention belongs to mechanical technical field of forging, relate to a kind of improvement of auto parts manufacturing process.
Background technology
Traditional especially forge hot industry of forging industry, the product level is low, " stupid, big, black, thick " product causes the wasting of resources, causes very big difficulty and the bigger wasting of resources for simultaneously the following process of blank product, and directly influences product and the raising of Related product level.With one of engine upper-part is that engine link is an example, adopt the disconnected formula connecting rod that rises to the requirement of Forging Technology than higher, require connecting rod should have certain tensile strength, disconnected, the common Forging Technology that also will realize easily rising is difficult to be competent at.Tradition forging Technology for Heating Processing increases temperature tempering, i.e. modifier treatment for quenching.With the batch-type furnace heating, usually cause the surface of the work decarburization, surface quality of workpieces and intensity index are obviously descended, cause the part main failure forms in use of this explained hereafter to show as fracture, distortion etc.
Summary of the invention
The objective of the invention is:
A kind of precision forging technique for cracking connection rod is provided, and it can realize precision forging under the prerequisite that does not influence the connecting rod workmanship.
Technology of the present invention is:
1, precise shearing and charging
Adopt precise shearing and charging equipment, blanking diameter range Φ 40～60, error in length can be controlled in ± 2mm, and incision does not have burr, no crimping, flawless.
2, Frequency Induction Heating
Adopt Medium Frequency Induction Heating Furnace, heating-up temperature can be controlled in 1000～1400 ℃, error ± 5 ℃.
3, the multiplex (MUX) goes on foot roller forging sheet stamping
Adopt forging roll, raw material by the designing requirement roll forging deformation, are satisfied the die forging requirement.
4, precision die forging
Adopt program control hydraulic die forging hammer, 2kg can be controlled in ± 0.5mm with interior blank finish forge spare dimensional discrepancy, and weight tolerance can be controlled in gross weight 5%g, and mismatch is controlled in the 0.4mm.
5, forcing press is cut edge, is proofreaied and correct
When cutting edge, forging is carried out thermal recalibration, avoid the forging torsional deformation.
6, air cooling is handled
Direct Air-Cooled behind the forging, air quantity, wind speed with the microcomputer automatic control air cooling apparatus can obtain even pearlite metallographic structure, can stop former quenching, heating decarburization problem, and quality is obviously improved, and mechanical property is guaranteed: σ
s〉=550N/mm
2, σ
b: 900～1050N/mm
2, δ 〉=10%, Ψ: 20%～40%; Decarburized layer≤0.15; The hardness control range is wide, satisfies the connecting rod performance requirement fully.
7, Shot Blasting
Bead is carried out on the forging surface, improve bearing stress and fineness, and reduce the forging internal stress, shot peening strength can reach Oman's value 0.3～0.5.
8, CS check
Adopt turbine CS inspection machine, forging is carried out 100% check, find to isolate the forging of the overproof and batch mixing of hardness.
9, fluorescent penetrating inspection
Behind forging magnetization and spray magnetic flaw detection ink, under ultraviolet, observe the magnetic trace, judge whether to exist folding, crackle.
10, pressure sizing through screw press
Utilize the pressure-sizing mould, on fly press, colded pressing in the forging surface,, guarantee that the depth of parallelism is in 0.5mm to improve the forging upper and lower surface depth of parallelism.
11, weightometer is weighed
Forging is carried out 100% weight check, to isolate defective work.
12, inspection eventually
Inspection comprises outward appearance, mismatch, amount of deflection eventually, is 100% and checks, prevents the outflow of defective work.
The invention has the beneficial effects as follows:
Adopt precision forging technology production rising disconnection bar finish forge spare, make the state-of-the-art technology of connecting rod manufacturing processing be implemented at home, use and promote,, substitute import, and can save a large amount of foreign exchanges to change conventional machining process and the method that China still continues to use at present.This new technology is an important breakthrough of transforming traditional production technique, is a major transformation of connecting rod Forging Technology.Compare with at present traditional Forging Technology, can improve nearly one times of the production efficiency of forging; Can energy savings 40%; Can save raw and auxiliary material 20%; Can simplify cold machining process, reduce cold working equipment investment 25%, shorten production line length, reduce floor space 30%, reduce production costs significantly; Connecting rod strength and assembly precision be can obviously improve, light motorcar engine dependability and economy improved; Can make the forging percent defective descend 50%.
The disconnection bar finish forge spare that rises is produced in batches, be the supporting high accuracy connecting rod of homemade sedan limousine, will promote that support is disconnected and the finish forge technology is promoted and development, especially after China joined WTO, because this product core technology is having of the domestic initiation international nineties of an advanced level technology, good product quality, price is low, dependable performance.
Embodiment 1
The application people is Jetta 152 connecting rods that FAW-Volkswagen produces, and belongs to the disconnected formula connecting rod that typically rises, and technological requirement is quite strict.My company adopts new Forging Technology to make product quality satisfy producer's requirement fully.Specific embodiments is:
1, precise shearing and charging:
Adopt precise shearing and charging equipment, blanking diameter of phi 40, length 112 ± 1mm.
2, Frequency Induction Heating
Adopt German INDUCAL Medium Frequency Induction Heating Furnace, 1230～1260 ℃ of heating-up temperatures.
3, the multiplex (MUX) goes on foot roller forging sheet stamping
Adopt forging roll, be designed to five work step roll forging, blank is distributed reach designing requirement.
4, precision die forging
Adopt program control hydraulic die forging hammer, dimensional discrepancy can be controlled in ± 0.25mm, and weight tolerance can be controlled in gross weight 3% gram, and mismatch is controlled in the 0.3mm.
5, forcing press is cut edge, is proofreaied and correct
When cutting edge, forging is carried out thermal recalibration, avoid the forging torsional deformation.
6, air cooling is handled
After treatment, metallographic structure is qualified, and mechanical property reaches: σ
s: 600N/mm
2, σ
b: 980N/mm
2, δ: 13%, Ψ: 30%; Decarburized layer: 0.1; Hardness HB269～302 are satisfied the disconnection bar performance requirement that rises fully.
7, Shot Blasting
Shot peening strength can reach Oman's value 0.4.
8, CS check
Adopt turbine CS inspection machine, forging is carried out 100% check, find to isolate the forging of the overproof and batch mixing of hardness.
9, fluorescent penetrating inspection
Behind forging magnetization and spray magnetic flaw detection ink, under ultraviolet, observe the magnetic trace, judge whether to exist folding, crackle.
10, pressure sizing through screw press
The forging upper and lower surface depth of parallelism can reach 0.3mm.
11, weightometer is weighed
Forging is carried out 100% weight check, to isolate defective work.
12, inspection eventually
Inspection comprises outward appearance, mismatch, amount of deflection eventually, is 100% and checks, prevents the outflow of defective work.
13, corrosion-proof packing
Adopt high-performance antirust oil that forging is carried out preservative treatment, by producer's requirement packing delivery.
Through the forging of above-mentioned explained hereafter, percent defective can be controlled in 2%, satisfies requirement of client fully.
Embodiment 2
The EA888 product that the application people produces for Shanghai Volkswagen's Skoda also belongs to the disconnected formula connecting rod that rises, and employing be a kind of we from original raw material, through our trial production, still take new Forging Technology, the result also succeeds, and has satisfied client's demand.Specific embodiments is:
1, precise shearing and charging:
Adopt precise shearing and charging equipment, blanking diameter of phi 41, length 112 ± 1mm.
2, Frequency Induction Heating
Adopt German INDUCAL Medium Frequency Induction Heating Furnace, 1280～1310 ℃ of heating-up temperatures.
3, the multiplex (MUX) goes on foot roller forging sheet stamping
Adopt forging roll, be designed to five work step roll forging, blank is distributed reach designing requirement.
4, precision die forging
Adopt program control hydraulic die forging hammer, dimensional discrepancy can be controlled in ± 0.25mm, and weight tolerance can be controlled in gross weight 3% gram, and mismatch is controlled in the 0.25mm.
5, forcing press is cut edge, is proofreaied and correct
When cutting edge, forging is carried out thermal recalibration, avoid the forging torsional deformation.
6, air cooling is handled
After treatment, metallographic structure is qualified, and mechanical property reaches: σ
s: 800N/mm
2, σ
b: 1000N/mm
2, δ: 15%, Ψ: 30%; Decarburized layer: 0.1; Hardness HB285～321 are satisfied the disconnection bar performance requirement that rises fully.
7, Shot Blasting
Shot peening strength can reach Oman's value 0.35.
8, CS check
Adopt turbine CS inspection machine, forging is carried out 100% check, find to isolate the forging of the overproof and batch mixing of hardness.
9, fluorescent penetrating inspection
Behind forging magnetization and spray magnetic flaw detection ink, under ultraviolet, observe the magnetic trace, judge whether to exist folding, crackle.
10, pressure sizing through screw press
The forging upper and lower surface depth of parallelism can reach 0.4mm.
11, weightometer is weighed
Forging is carried out 100% weight check, to isolate defective work.
12, inspection eventually
Inspection comprises outward appearance, mismatch, amount of deflection eventually, is 100% and checks, prevents the outflow of defective work.
13, corrosion-proof packing
Adopt high-performance antirust oil that forging is carried out preservative treatment, by producer's requirement packing delivery.
Through the forging of above-mentioned explained hereafter, percent defective can be controlled in 2%, satisfies requirement of client fully.
Claims (1)
1, a kind of precision forging technique for cracking connection rod, its technology is:
A, precise shearing and charging
Adopt precise shearing and charging equipment, blanking diameter range Φ 40～60, error in length can be controlled in ± 2mm, and incision does not have burr, no crimping, flawless;
B, Frequency Induction Heating
Adopt Medium Frequency Induction Heating Furnace, heating-up temperature can be controlled in 1000～1400 ℃, error ± 5 ℃;
C, multiplex (MUX) go on foot roller forging sheet stamping
Adopt forging roll, raw material by the designing requirement roll forging deformation, are satisfied the die forging requirement;
D, precision die forging
Adopt program control hydraulic die forging hammer, 2kg can be controlled in ± 0.5mm with interior blank finish forge spare dimensional discrepancy, and weight tolerance can be controlled in gross weight 5%g, and mismatch is controlled in the 0.4mm;
E, forcing press are cut edge, are proofreaied and correct
When cutting edge, forging is carried out thermal recalibration, avoid the forging torsional deformation;
F, air cooling are handled
Direct Air-Cooled behind the forging, air quantity, wind speed with the microcomputer automatic control air cooling apparatus can obtain even pearlite metallographic structure, can stop former quenching, heating decarburization problem, and quality is obviously improved, and mechanical property is guaranteed: σ
s〉=550N/mm
2, σ
b: 900～1050N/mm
2, δ 〉=10%, Ψ: 20%～40%; Decarburized layer≤0.15; The hardness control range is wide, satisfies the connecting rod performance requirement fully;
G, Shot Blasting
Bead is carried out on the forging surface, improve bearing stress and fineness, and reduce the forging internal stress, shot peening strength can reach Oman's value 0.3～0.5;
H, CS check
Adopt turbine CS inspection machine, forging is carried out 100% check, find to isolate the forging of the overproof and batch mixing of hardness;
J, fluorescent penetrating inspection
Behind forging magnetization and spray magnetic flaw detection ink, under ultraviolet, observe the magnetic trace, judge whether to exist folding, crackle;
K, pressure sizing through screw press
Utilize the pressure-sizing mould, on fly press, colded pressing in the forging surface,, guarantee that the depth of parallelism is in 0.5mm to improve the forging upper and lower surface depth of parallelism;
L, weightometer are weighed
Forging is carried out 100% weight check, to isolate defective work;
M, inspection eventually
Inspection comprises outward appearance, mismatch, amount of deflection eventually, is 100% and checks, prevents the outflow of defective work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100512589A CN101433939A (en) | 2008-10-10 | 2008-10-10 | Precision forging technique for cracking connection rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100512589A CN101433939A (en) | 2008-10-10 | 2008-10-10 | Precision forging technique for cracking connection rod |
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| Publication Number | Publication Date |
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| CN101433939A true CN101433939A (en) | 2009-05-20 |
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ID=40708666
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| CNA2008100512589A Pending CN101433939A (en) | 2008-10-10 | 2008-10-10 | Precision forging technique for cracking connection rod |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101574721B (en) * | 2009-06-09 | 2011-04-06 | 上海昌强电站配件有限公司 | Once hot-forging shaping process for manufacturing joint hinge |
| CN102319867A (en) * | 2011-09-29 | 2012-01-18 | 芜湖禾田汽车工业有限公司 | Forging forming process for control arm |
| CN102764955A (en) * | 2012-06-26 | 2012-11-07 | 昌利锻造有限公司 | Shiting fork processing method |
| CN102836946A (en) * | 2012-09-11 | 2012-12-26 | 四川豪特石油设备有限公司 | Roll forging forming process for last stage of moving blade of 600MW unit steam turbine |
| CN102989989A (en) * | 2012-08-17 | 2013-03-27 | 大连大高阀门股份有限公司 | Forging process of heavy truck steering knuckle |
| CN102989944A (en) * | 2012-08-22 | 2013-03-27 | 昌利锻造有限公司 | Forging method of expansion breaking connecting rod |
| CN103100624A (en) * | 2013-01-03 | 2013-05-15 | 浙江黄岩江鑫锻造有限公司 | Landscape engineering machinery connecting rod precision forging method |
| CN105397416A (en) * | 2015-12-01 | 2016-03-16 | 温州市研制阀门厂 | Forging method of valve |
| CN105586479A (en) * | 2015-12-30 | 2016-05-18 | 新兴能源装备股份有限公司 | Method for controlling ferrite content to be lower than 4% through austenite stainless steel end socket spinning forming |
| 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 |
| CN107234199A (en) * | 2017-07-03 | 2017-10-10 | 河池桂嘉知识产权服务有限公司 | Engineering machinery connecting rod precision forging method |
| AU2017248490B2 (en) * | 2016-09-10 | 2019-11-14 | Jilin University | Method of near-net-shape forged molding of coupler knuckle of railway vehicle |
| CN110576042A (en) * | 2019-09-11 | 2019-12-17 | 南京工程学院 | Engine cracking connecting rod, method for manufacturing steel and method for manufacturing forging of steel |
| CN110756583A (en) * | 2019-09-11 | 2020-02-07 | 南京钢铁股份有限公司 | Preparation method of non-quenched and tempered steel and method for preparing fine-grained forging by using same |
| CN111185729A (en) * | 2020-01-21 | 2020-05-22 | 中车齐齐哈尔车辆有限公司 | Forging process method for middle pull rod |
| CN112296247A (en) * | 2020-10-10 | 2021-02-02 | 中国重汽集团济南动力有限公司 | Cooling process for manufacturing expansion-breaking connecting rod blank by using 38MnVS6 medium carbon non-quenched and tempered steel |
| CN113926979A (en) * | 2021-09-30 | 2022-01-14 | 无锡锡西模锻有限公司 | High-precision high-mechanical-property forging production process |
| CN114346160A (en) * | 2021-12-30 | 2022-04-15 | 苏州昆仑重型装备制造有限公司 | Forging process for connecting rod of large internal combustion engine and die forging die thereof |
| CN115608910A (en) * | 2022-12-20 | 2023-01-17 | 南宫市精强连杆有限公司 | Automatic forging production system for connecting rod and control method |
-
2008
- 2008-10-10 CN CNA2008100512589A patent/CN101433939A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101574721B (en) * | 2009-06-09 | 2011-04-06 | 上海昌强电站配件有限公司 | Once hot-forging shaping process for manufacturing joint hinge |
| CN102319867A (en) * | 2011-09-29 | 2012-01-18 | 芜湖禾田汽车工业有限公司 | Forging forming process for control arm |
| CN102764955A (en) * | 2012-06-26 | 2012-11-07 | 昌利锻造有限公司 | Shiting fork processing method |
| CN102989989A (en) * | 2012-08-17 | 2013-03-27 | 大连大高阀门股份有限公司 | Forging process of heavy truck steering knuckle |
| CN102989944A (en) * | 2012-08-22 | 2013-03-27 | 昌利锻造有限公司 | Forging method of expansion breaking connecting rod |
| CN102836946A (en) * | 2012-09-11 | 2012-12-26 | 四川豪特石油设备有限公司 | Roll forging forming process for last stage of moving blade of 600MW unit steam turbine |
| CN102836946B (en) * | 2012-09-11 | 2014-11-05 | 四川豪特石油设备有限公司 | Roll forging forming process for last stage of moving blade of 600MW unit steam turbine |
| CN103100624A (en) * | 2013-01-03 | 2013-05-15 | 浙江黄岩江鑫锻造有限公司 | Landscape engineering machinery connecting rod precision forging method |
| CN105397416A (en) * | 2015-12-01 | 2016-03-16 | 温州市研制阀门厂 | Forging method of valve |
| CN105586479A (en) * | 2015-12-30 | 2016-05-18 | 新兴能源装备股份有限公司 | Method for controlling ferrite content to be lower than 4% through austenite stainless steel end socket spinning forming |
| 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 |
| AU2017248490B2 (en) * | 2016-09-10 | 2019-11-14 | Jilin University | Method of near-net-shape forged molding of coupler knuckle of railway vehicle |
| CN107234199A (en) * | 2017-07-03 | 2017-10-10 | 河池桂嘉知识产权服务有限公司 | Engineering machinery connecting rod precision forging method |
| CN110576042A (en) * | 2019-09-11 | 2019-12-17 | 南京工程学院 | Engine cracking connecting rod, method for manufacturing steel and method for manufacturing forging of steel |
| CN110756583A (en) * | 2019-09-11 | 2020-02-07 | 南京钢铁股份有限公司 | Preparation method of non-quenched and tempered steel and method for preparing fine-grained forging by using same |
| CN111185729A (en) * | 2020-01-21 | 2020-05-22 | 中车齐齐哈尔车辆有限公司 | Forging process method for middle pull rod |
| CN112296247A (en) * | 2020-10-10 | 2021-02-02 | 中国重汽集团济南动力有限公司 | Cooling process for manufacturing expansion-breaking connecting rod blank by using 38MnVS6 medium carbon non-quenched and tempered steel |
| CN112296247B (en) * | 2020-10-10 | 2022-05-06 | 中国重汽集团济南动力有限公司 | Cooling process for manufacturing expansion-breaking connecting rod blank by using 38MnVS6 medium carbon non-quenched and tempered steel |
| CN113926979A (en) * | 2021-09-30 | 2022-01-14 | 无锡锡西模锻有限公司 | High-precision high-mechanical-property forging production process |
| CN114346160A (en) * | 2021-12-30 | 2022-04-15 | 苏州昆仑重型装备制造有限公司 | Forging process for connecting rod of large internal combustion engine and die forging die thereof |
| CN115608910A (en) * | 2022-12-20 | 2023-01-17 | 南宫市精强连杆有限公司 | Automatic forging production system for connecting rod and control method |
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Open date: 20090520 |