扭杆弹簧齿根滚压强化残余应力场仿真分析  

Simulation Analysis of Residual Stress Induced by Rolling Process at the Tooth Root of Torsion-Bar Spring

作　　者：梁志强[1] 王康[2] 李宏伟[3] 裴家杰 王西彬[1] 刘心藜 王洪臣[3] 魏玉春[3] LIANG Zhiqiang;WANG Kang;LI Hongwei;PEI Jiajie;WANG Xibin;LIU Xinli;WANG Hongchen;WEI Yuchun(Key Laboratory of Fundamental Science for Advanced Machining, Beijing Institute of Technology, Beijing 100081, China;School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;Beijing North Vehicle Group Corporation, Beijing 100072, China)

机构地区：[1]北京理工大学先进加工技术国防重点学科实验室,北京100081 [2]北京理工大学机械与车辆学院,北京100081 [3]北京北方车辆集团有限公司,北京100072

出　　处：《新技术新工艺》2018年第3期43-47,共5页New Technology & New Process

基　　金：国防科工局基础科研项目(JCKY2017208C005)

摘　　要：通过对扭杆弹簧齿根进行滚压强化,使其在齿根处形成残余压应力场,以有效延长扭杆弹簧使用寿命。为了研究滚压工艺对齿根残余应力场分布的影响规律,对齿根滚压加工过程进行了有限元仿真分析,建立了滚压力、等效残余应力和齿根处位移变化量三者之间的关系,研究了滚压后齿根残余应力场的分布规律。仿真结果表明,齿根表面等效残余应力随滚压力的提升而增大,但增大趋势不是线性增加;等效残余应力沿层深的分布呈指数型规律,在齿根表面达到最大值;周向残余应力沿层深的分布为先压后拉,最后趋于零。仿真结果结合在线测量装置监测齿根位移变化量,可预测滚压力和滚压后的残余应力值,从而有效地评价工件的滚压效果。Rolling process at the tooth root of torsion-bar spring is an effective method to prolong its fatigue life,because it induces residual compressive stress around the tooth root.In order to study the effect of rolling process on the distribution of residual stress field,a finite element model of tooth root rolling process is proposed.Based on the simulation calculation results,the interaction relationship among the rolling pressure,the residual stress and the dimensional change of tooth root are obtained.Simulation results show that the effective residual stress increases nonlinearly with the increase of rolling pressure.The effective residual stress along the depth direction follows exponential distribution and reaches the maximum at the surface of tooth root.The circumferential residual stress along the depth direction is at first compressive then tensile and finally tends to zero.Further,combination of the simulation results and the online measurement device may provide an effective way to evaluate the performance of rolling process.

关 键 词：滚压强化 扭杆弹簧 残余应力 仿真分析 

分 类 号：TG376[金属学及工艺—金属压力加工]