Transactions of Materials and Heat Treatment

Title：Early fatigue failure modes and cause analysis on front axle in a commercial vehicle

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ClassificationCode：TG142.41

year,vol(issue):pagenumber：2020,45(7):192-197

Abstract：

The failure mode and the morphology in failure position appearing in vertical bending fatigue test for front axle in a commercial vehicle were studied, and the main fracture positions of front axle were located in the I-section, rectangular section and inner of fist hole in lower tension surface. Combined with the production process of machining, forging, grinding and strong shot peening for front axle, the main reasons and mechanism of front axle failure were systematically analyzed, and the main reasons included surface folding and decarburization during the forging process, groove-like pull marks and folds caused in defects at the trimming die during the trimming process, insufficient shot peening strength during the shot peening process, uneven surface, stress concentration and fretting wear caused in the grinding process. Finally, aiming at above failure reasons, the entire process of front axle was optimized, especially the key technological process, and the life of optimized front axle in fatigue bench test reached one million cycles.

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王欢锐（1983-），女，硕士，高级工程师 E-mail：happywhr@163.com

Reference：

[1]李伟, 陈文琳,吴跃,等.40Cr商用车前轴早期断裂失效分析[J]. 塑性工程学报,2014，21(5):88-92.

Li W, Chen W L, Wu Y, et al. Early failure analysis of 40Cr commercial vehicle front axle[J]. Journal of Plasticity Engineering, 2014, 21(5): 88-92.

[2]魏科, 王高潮,李宁,等.基于DEFORM和正交试验法的前轴辊锻工艺优化[J].塑性工程学报,2012，19(1):6-10.

Wei K, Wang G C, Li N, et al. Research on optimization of frontaxle roll forging technique based on DEFORM and orthogonal experimental method[J]. Journal of Plasticity Engineering, 2012, 19(1):6-10.

[3]Jafari A, Khanali M, Mobli H, et al. Stress analysis of front axle of JD955 combine harvester under static loading[J]. Journal of Agriculture & Social Sciences, 2010，(8):359-364.

[4]刘惟信. 汽车车桥设计[M].北京:清华大学出版社,2004.

Liu W X. Automobile Axle Design[M]. Beijing: Tsinghua University Press, 2004.

[5]安治国, 黄艳新,侯环宇，等.汽车前轴用贝氏体型非调质钢连续冷却转变[J].钢铁,2016，51（12）:70-73.

An Z G, Huang Y X, Hou H Y, et al. Continuous cooling transformation of bainite nonquenched and tempered steel for automobile front axle[J]. Iron and Steel, 2016, 51(12): 70-73.

[6]李民和. 不同热处理工艺对汽车前轴力学性能的影响[J].铸造技术,2014，35（1）:60-62.

Li M H. Effects of different heat treatment process on mechanical properties of automobile front axle[J]. Foundry Technology, 2014, 35(1): 60-62.

[7]武络，宫显宇，韩海河，等.重型载货汽车前轴锻件热处理工艺仿真分析[J].金属加工:热加工，2015，（7）:38-40.

Wu L, Gong X Y, Han H H, et al. Simulation analysis of heat treatment process of front axle forging of heavy truck[J]. MW Metal Forming，2015，（7）:38-40.

[8]高妍，陈文琳，王梁，等.42CrMo钢重型商用车前轴淬火过程中组织转变[J].塑性过程学报，2016，23（5）:179-181.

Gao Y, Chen W L, Wang L, et al. Microstructure transformation in quenching process of 42CrMo heavy commercial vehicle front axle[J]. Journal of Plasticity Engineering, 2016, 23(5): 179-181.

[9]李海峰. 汽车前轴锻造工艺改进研究[J].企业技术开发，2015，34（11）:11-12.

Li H F. Research on forging process improvement of automobile front axles[J]. Technological Development of Enterprise, 2015, 34(11): 11-12.

[10]甘达淅，覃业均.汽车前轴的锻压工艺优化研究[J].热加工工艺，2017，46（9）：175-182.

Gan D X, Qin Y J. Study on optimization of forging process of automobile front axle[J]. Hot Working Technology, 2017, 46(9): 175-182.

[11]QC/T 513—1999，汽车前轴台架疲劳寿命试验方法[S].

QC/T 513—1999, Test method of fatigue life for automobile front axle bench [S].

[12]袁智明，柴博，贾伟伟，等.某轻型卡车前桥用工字梁疲劳寿命偏低分析及优化[J].汽车实用技术,2017，(22):110-112.

Yuan Z M, Chai B, Jia W W, et al. Low fatigue life analysis and optimization of the fatigue life of the front axle of a light truck[J]. Automobile Applied Technology, 2017, (22): 110-112.

[13]王梁, 陈国强, 郑明玉, 等.某型号前轴疲劳试验及结果分析[J].锻压技术, 2017, 42(5): 119-122.

Wang L, Chen G Q, Zheng M Y, et al. Fatigue test and result analysis on a vehicle front axle[J]. Forging & Stamping Technology, 2017, 42(5):119-122.

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