铣削内螺纹表面的残余应力仿真分析

Simulation Analysis of Residual Stress of Internal Thread Surface by Milling

螺纹连接应用广泛于各个领域,其表面残余应力严重影响工件表面质量和工件使用寿命,因此对铣削内螺纹加工表面的残余应力研究尤为重要。为研究不同铣削参数对45钢在铣削内螺纹过程中螺纹表面残余应力的影响,利用有限元分析软件建立3D铣削内螺纹的仿真模型,研究铣削过程中内螺纹表面残余应力与切削参数之间的变化规律。采用单因素控制变量法,在保证其它两个切削参数不变的情况下,分析当前切削参数对残余应力的影响。研究结果表明,铣削内螺纹时,应在合理范围内选取较小的切削速度、进给量和切削深度,以降低被加工材料表面残余应力,减小表层金属塑性变形范围,延长工件使用寿命。

Threaded connection is widely used in various fields,the residual stress on the surface seriously affects the surface quality and service life of the workpiece.Therefore,it is very important to study the residual stress on the surface of milling internal threads.In order to study the influence of different milling parameters on the residual stress of 45 steel thread surface during milling internal thread,by using finite element analysis software,the simulation model of 3D milling internal thread is built,and the variation of residual stress on internal thread surface and cutting parameters during milling is studied.Single factor control variable method is used,while keeping the other two cutting parameters is unchanged,the influence of current cutting parameters on residual stress is analyzed.The results show that when milling internal threads,a small cutting speed,feed and cutting depth should be selected within a reasonable range to reduce the residual stress on the surface of the processed material,reduce the plastic deformation range of surface metal,increase the service life of the workpiece.