Transactions of Materials and Heat Treatment

Title：Metal flow analysis and study of the magnetic marks during the crankshaft forging process

Authors： Li Aina Luo Shibin

Unit： Yangjiang Vocational and Technical College

KeyWords： six throw crankshaft magnetic particle inspection numerical simulation forging

ClassificationCode：TG316

year,vol(issue):pagenumber：2015,40(12):11-15

Abstract：

For six throw crankshaft, the magnetic particle inspection analysis was carried out, and the morphology and distribution of the magnetic marks were observed after the above test. Further, the forging process of crankshaft was simulated by three-dimensional finite element software Transvalor Forge-3D, and the influence of the metal flow on the crankshaft magnetic marks during forging process was studied. The simulation results show that during the pre-forging and final forging process, the inside parting surface of the third and the fourth cranks,the first and the sixth cranks corresponds to the central material, and the transverse distribution of the second and the fifth cranks in the circular section of the central material is about 10 mm above the center. Therefore, when the central material flows to the inside fillet of the first and the third cranks, it is easy to expose on the surface of the workpieces after the subsequent machining processes, and the exposed central material is easy to cause cracks and magnetic marks, which is one of the main reasons of the magnetic marks formation. The results show that the exposure of the central metal material can be avoided by adjusting the pre-forging size of the die, and the quality of the raw materials can be controlled strictly, and the defects of the central metal are limited within a certain allowable range. As a result, the internal defects of crankshaft in actual forging can be avoided.

Funds：

河南省重点攻关项目（132102210119）；阳江职业技术学院2014年院内教改课题

作者简介：李爱娜（1977-），女，硕士研究生，讲师，工程师

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