液氮冷却加工Ti-6Al-4V表面残余应力多因素仿真分析

Multi-factor Simulation Analysis of Surface Residual Stress for Ti-6Al-4V Cryogenic Machining Using Liquid Nitrogen

针对Ti-6Al-4V钛合金液氮冷却加工,建立基于切削区域分解的液氮冷却正交切削表面残余应力有限元预估模型,分析冷却施加方式、切削参数和刀具参数等因素对表面残余应力分布的影响。通过仿真加工表面残余应力数据分析,前、后刀面同时冷却、较小切削速度或较大切削深度以及增加刀具刃口半径均有助于获得加工表面压应力,对液氮冷却加工的实施提供了参考依据。

Aiming at the liquid nitrogen cooling process of Ti-6 Al-4 V titanium alloy,based on the decomposition of the cutting area,the finite element prediction model of residual stress on the orthogonal cutting surface of liquid nitrogen cooling is established.The influence of various factors such as cooling factors,cutting parameters and tool parameters on the residual stress distribution on the surface is analyzed.Through the analysis of the residual stress data of the simulated processing surface,simultaneous cooling of the front and back flank surfaces,smaller cutting speed or a larger cutting depth,and an increase in the cutting edge radius of the tool help to obtain the compressive stress of the machined surface which provides a reference basis for guiding the implementation of liquid nitrogen cooling.