CN102896585A - Shot blasting process for producing high-strength and high-stress steel plate spring - Google Patents
Shot blasting process for producing high-strength and high-stress steel plate spring Download PDFInfo
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- CN102896585A CN102896585A CN2012103982667A CN201210398266A CN102896585A CN 102896585 A CN102896585 A CN 102896585A CN 2012103982667 A CN2012103982667 A CN 2012103982667A CN 201210398266 A CN201210398266 A CN 201210398266A CN 102896585 A CN102896585 A CN 102896585A
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Abstract
The invention belongs to the technical field of automobile steel plate spring shot blasting processes, and particularly relates to a shot blasting process for producing a high-strength and high-stress steel plate spring. In the process, shot blasting is performed after medium-temperature tempering and heat preservation are performed in the steel plate spring for 90-120 minutes, and the medium temperature is controlled at 100-300 DEG C during shot blasting; steel shots applied in shot blasting are 0.8-1.2 millimeters in diameter, and comprise the following chemical components: 0.65-0.85 percent of C, 0.10-0.35 percent of Si, 0.60-1.20 percent of Mn, 0-0.045 percent of P, 0-0.05 percent of S and the balance of iron. In the process, shot blasting is performed by using the conventional shot blasting machine and shot blasting medium under the condition of not increasing the material cost, the surface covering rate can be over 100 percent, the residual stress can be over 650Mpa, and the fatigue service life of the spring is up to 160,000 times under the testing condition of 650+/-450Mpa.
Description
Technical field
The present invention relates to a kind of shot-blast process of producing high strength and heavily stressed leaf spring, belong to automobile leaf spring cloudburst treatment art technical field.
Background technology
Stress peening process is that the bullet stream that utilizes high-speed motion makes the surface produce the cyclic plastic strain layer to the impact of metal surface, causes thus the microscopic structure of this layer favourable variation to occur and make the top layer introduce residual compressive stress field.The microscopic structure on top layer and residual compressive stress field are that fatigue (comprising that microseism the is tired) Strenth and stress that improves metal material and spring thereof corrodes two intensifying factors of (containing hydrogen embrittlement) fracture resistance, to improve reliability and the durability of spring.
At automotive field, people are devoted to improve the bulk life time of automobile always under the prerequisite that alleviates Integral automobile weight, particularly in abominable automobilism environment.
The key characteristic that affects leaf spring fatigue life has raw material, heat treatment, shot-peening.Under the more and more light-weighted condition of material, can be realized by increasing spring design stress.Along with the raising that the raising of vehicle load and client require product quality, heavily stressed, high strength leaf spring becomes following development trend.Shot-peening is domestic unsolved problem as the important means that improves the leaf spring residual stress, is technical bottleneck.
Summary of the invention
According to above deficiency of the prior art, the technical problem to be solved in the present invention is: provide a kind of can the Effective Raise leaf spring production high strength of fatigue life and the shot-blast process of heavily stressed leaf spring.
The technical solution adopted for the present invention to solve the technical problems is: the shot-blast process of described production high strength and heavily stressed leaf spring, it is characterized in that: carry out shot-peening behind leaf spring average tempering insulation 90 ~ 120min, medium temperature is controlled at 100 ~ 300 ℃ during shot-peening;
The shot of using in the shot-peening process, diameter are Φ 0.8 ~ 1.2mm, and its chemical composition content is as follows:
C 0.65%~0.85%；
Si 0.10%~0.35%；
Mn 0.60%~1.20%；
P 0~0.045%；
S 0~0.05%；
All the other are iron.
Described shot hardness is HRC50 ~ 60.
Hot peening technique of the present invention is to use existing compressed air shotblasting machine and blasting media to carry out shot-peening in the situation that do not increase material cost, the described shot-blast process of the application of the invention is tested, surface coverage can reach more than 100%, and residual compressive stress can reach more than the 650Mpa.Under the experimental condition of 650 ± 450Mpa, reach the fatigue life of spring more than 160,000 times, compare with common process and improve fatigue life more than 2 times.
The beneficial effect that the present invention compared with prior art has is:
1, shot-blast process of the present invention is to use existing compressed air shotblasting machine and blasting media to carry out shot-peening under the condition that does not improve material cost and reduction production efficiency, the described shot-blast process of the application of the invention is tested, the surface coverage of leaf spring can reach more than 100%, and residual compressive stress can reach more than the 650Mpa;
2, the present invention improves the fatigue life of product, under 650 ± 450Mpa experimental condition, can reach fatigue life more than 160,000 times;
3, the present invention is when operation is implemented, production safety, and direct shot-peening after the tempering has reduced production link, and is energy-saving and cost-reducing;
4, the present invention obtains the commercialization success through lab scale, pilot scale, batch trial-production and production, implements investment cost low, and Practical Performance is good, suits in the industry cycle to popularize.
The specific embodiment
Below in conjunction with embodiment embodiments of the invention are described further:
Embodiment 1
1) leaf spring material: 50CrMnSiVNb, material specification is 24*90*1500, monolithic weight is 25Kg approximately, approximately 0.5 ton of test material.
Carry out shot-peening behind the insulation 100min behind the leaf spring average tempering, medium temperature is controlled at 300 ℃ during shot-peening, and the shot of using in the shot-peening process, diameter are Φ 1.0mm, and hardness is HRC60, and the chemical composition content of shot is as follows:
C 0.85%；
Si 0.35%；
Mn 1.20%；
P 0.045%；
S 0.05%；
All the other are iron.
2) result of the test is as follows:
Embodiment 2
1) leaf spring material: FAS3550, material specification is 30*89*1500, monolithic weight is 35Kg approximately, approximately 1 ton of test material.
Carry out shot-peening behind the leaf spring average tempering insulation 120min, medium temperature is controlled at 200 ℃ during shot-peening, and the shot of using in the shot-peening process, diameter are Φ 0.9mm, and hardness is HRC50, and the chemical composition content of shot is as follows:
C 0.70%；
Si 0.20%；
Mn 0.95%；
P 0.040%；
S 0.045%；
All the other are iron.
2) result of the test is as follows:
In above-described embodiment 1 ~ 2:
Common process is for after quenching by normal production conditions, through continous way tempering heating furnace average tempering, be incubated 120 minutes, after using QPY-Z4M type stress shot-blasting machine directly to carry out stress shot blasting after the cooling, and carry out fatigue test (PSJ200 mechanical fatigue test machine), maximum stress 1100MPa;
New technology is for after quenching by normal production conditions, after continous way tempering heating furnace average tempering is incubated 120 minutes, after using QPY-Z4M type stress shot-blasting machine directly to carry out hot peening, and carry out fatigue test (PSJ200 mechanical fatigue test machine), maximum stress 1100MPa.
By above-mentioned result of the test as can be known, by the product that this technique obtains, all reach more than 160,000 times fatigue life, compares common process and improved more than 2 times.
Claims (2)
1. shot-blast process of producing high strength and heavily stressed leaf spring, it is characterized in that: carry out shot-peening after being incubated 90 ~ 120min behind the leaf spring average tempering, medium temperature is controlled at 100 ~ 300 ℃ during shot-peening;
The shot of using in the shot-peening process, diameter are Φ 0.8 ~ 1.2mm, and its chemical composition content is as follows:
C 0.65%~0.85%；
Si 0.10%~0.35%；
Mn 0.60%~1.20%；
P 0~0.045%；
S 0~0.05%；
All the other are iron.
2. the shot-blast process of production high strength according to claim 1 and heavily stressed leaf spring, it is characterized in that: described shot hardness is HRC50 ~ 60.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103982667A CN102896585A (en) | 2012-10-18 | 2012-10-18 | Shot blasting process for producing high-strength and high-stress steel plate spring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103982667A CN102896585A (en) | 2012-10-18 | 2012-10-18 | Shot blasting process for producing high-strength and high-stress steel plate spring |
Publications (1)
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| CN102896585A true CN102896585A (en) | 2013-01-30 |
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| CN2012103982667A Pending CN102896585A (en) | 2012-10-18 | 2012-10-18 | Shot blasting process for producing high-strength and high-stress steel plate spring |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109722519A (en) * | 2018-11-30 | 2019-05-07 | 天津市大港汽车配件弹簧厂 | Automobile stabilizer bar heat treatment process of the hardness in the range of HRC45.3 ~ 49.1 |
| EP3498425A1 (en) * | 2017-12-15 | 2019-06-19 | United Technologies Corporation | Laser assisted surface finishing apparatus and method |
| CN113073176A (en) * | 2021-03-22 | 2021-07-06 | 重庆中海弹簧有限公司 | Spring manufacturing process |
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| CN85100662A (en) * | 1985-04-01 | 1986-07-30 | 冶金部钢铁研究总院 | Novel water-quenching spring steel 35SiMnB and manufacturing process thereof |
| DE19852734A1 (en) * | 1997-11-17 | 1999-08-19 | Chuo Hatsujo Kk | Spring especially a vehicle or machine spring with high corrosion fatigue resistance |
| US20050028902A1 (en) * | 2001-12-26 | 2005-02-10 | Mamoru Akeda | Leaf spring for vehicle and method of manufacturing the leaf spring |
| CN101698922A (en) * | 2009-09-29 | 2010-04-28 | 昆山新浦瑞金属材料有限公司 | Reinforced steel shot and preparation method thereof |
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| CN102443686A (en) * | 2012-01-09 | 2012-05-09 | 东风汽车悬架弹簧有限公司 | Surface shot blasting reinforcement method of steel plate spring |
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| DE19852734A1 (en) * | 1997-11-17 | 1999-08-19 | Chuo Hatsujo Kk | Spring especially a vehicle or machine spring with high corrosion fatigue resistance |
| US20050028902A1 (en) * | 2001-12-26 | 2005-02-10 | Mamoru Akeda | Leaf spring for vehicle and method of manufacturing the leaf spring |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3498425A1 (en) * | 2017-12-15 | 2019-06-19 | United Technologies Corporation | Laser assisted surface finishing apparatus and method |
| US10807214B2 (en) | 2017-12-15 | 2020-10-20 | Raytheon Technologies Corporation | Laser assisted surface finishing apparatus and method |
| CN109722519A (en) * | 2018-11-30 | 2019-05-07 | 天津市大港汽车配件弹簧厂 | Automobile stabilizer bar heat treatment process of the hardness in the range of HRC45.3 ~ 49.1 |
| CN113073176A (en) * | 2021-03-22 | 2021-07-06 | 重庆中海弹簧有限公司 | Spring manufacturing process |
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Address after: 255100 Zichuan Economic Development Zone, Shandong, China, Zibo Applicant after: SHANDONG LEOPARD AUTOMOTIVE HOLDINGS LTD. Address before: 255100 Shandong city of Zibo province Zichuan Economic Development Zone No. 9 Leipadelu Applicant before: Shandong Leopard Spring Co., Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: SHANDONG LEOPARD SPRING CO., LTD. TO: SHANDONG LEOPARD AUTOMOTIVE HOLDINGS LTD. |
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Application publication date: 20130130 |