【摘要】 基于ABAQUS软件对2024铝合金的超精密车削过程进行热力耦合仿真模拟,研究了切削三要素对工件表面残余应力的影响规律,并采用了评价函数的方法,以低残余应力为目标进行了切削参数优化。结果表明:2024铝合金已加工表面（切削稳定区域）以压应力为主,随着距已加工表面距离的增加,残余压应力值减小并逐渐变为拉应力,残余应力分布深度在10μm内。随着切削深度（10～30μm范围内）的增大、切削速度(50～150 m·min^-1范围内)的减小、进给量（10～24μm范围内）的增大,2024铝合金工件表面残余应力呈现增大趋势,采用评价函数进行优化,确定了当切削速度129.865 0 m·min^-1(实际切削加工可取130 m·min^-1),进给量为8.9μm,背吃刀量为1μm时,总体表面残余应力最小,表面质量更优,经过车削实验也验证了结论的可靠性。更多还原

【Abstract】 Based on ABAQUS software,the thermal mechanical coupling simulation of the ultra precision turning process of 2024 aluminum alloy wascarried out.The influence of the three cutting elements on the surface residual stress of the workpiece wasstudied,and the method of evaluation function was adopted to optimize the cutting parameters with the goal of low residual stress.The results showed that the main stress of 2024 aluminum alloy machined surface（cutting stable area） was compressive stress.With the increase of distance from the machined surface,the residual compressive stress decreased and gradually become tensile stress,and the distribution depth of residual stresswas within 10μm.With the increase of cutting depth（in the range of 10-30 μm）,the decrease of cutting speed(in the range of 50-150 m·min^-1),and the increase of feed rate（in the range of 10-24 μm）,the residual stress on 2024 aluminum alloy workpiece surface increased.The evaluation function was used to optimize it.When the cutting speed was 129.865 0 m·min^-1（the actual cutting process can be 130 m·min-1）,the feed ratewasdetermined At 8.9 μm and 1 μm back draft,the total surface residual stress was the smallest and the surface qualitywas better.The turning experiment also verified the reliability of the conclusion.更多还原