Transactions of Materials and Heat Treatment

Title：Mechanism and preventive measures on grinding cracks for automobile steering shaft tooth

Authors： Zhang Yishuai Sun Hongxing Zhang Chao Liu Hua

Unit： Zhengzhou Research Institute of Mechanical Engineering Co. Ltd. China Academy of Machinery Science and Technology Group Co. Ltd. Xi′an Jiaotong University

KeyWords： steering shaft tooth carburizing and quenching grinding grinding crack secondary quenching

ClassificationCode：TG113.1；TG142.1

year,vol(issue):pagenumber：2019,44(7):92-96

Abstract：

For the grinding cracks of automobile steering shaft tooth after carburizing, the produced causes were analyzed by combining chemical composition analysis, micro-structural analysis and micro-hardness test. The results show that the cracks in the grinding process of steering shaft tooth are mainly caused by severe secondary quenching burn and grinding burn on the tooth surface as well as the secondary quenching martensite and tempered troostite formed on the surface. Furthermore, the tooth surface presents a tensile stress state under the combined action of the thermal stress produced during the grinding process and the tissue stress produced by the phase transformation of material, and the cracks appear on the grinding surface when the local stress exceeds the tensile strength of material. Thus, the heat treatment process and grinding process parameters of steering shaft tooth were adjusted to avoid the grinding cracks. Finally, according to the meshing principle of the rack and pinion of hydraulic power steering system, the design idea of the root of steering shaft tooth without grinding was proposed.

Funds：

郑州市重大科技专项（152PZDZX007）

张义帅（1984-），男，博士研究生，E-mail：zhangyishuai@bit.edu.cn；通讯作者：刘华（1962-），男，博士，研究员，E-mail：pformdept@163.com

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