切削17-4PH不锈钢时刀具磨损对切削过程的影响分析

Analysis of Influence of Tool Wear on Cutting Process of 17- 4PH Stainless Steel

为了探究刀具磨损对切削力和已加工表面温度的影响,考虑实际切削过程中的刀具磨损类型,建立了不同磨损类型的刀具几何模型,采用DEFORM软件建立17-4PH不锈钢正交切削有限元模型。基于有限元模型研究了刀具磨损对切削温度、分流点和接触表面应力等的影响规律,并通过切削实验验证磨损模型的可靠性,研究了后刀面磨损与切削力之间的演化规律。结果表明:前刀面磨损在一定程度上可以降低切削力和切削温度,其余磨损形式会增大切削力;随着后刀面磨损VB的增大,犁耕效应显著,切削力增大较为明显,而接触面的应力变化不明显。

In order to explore the influence of tool wear on cutting force and machined surface temperature,considering the tool wear types in the actual cutting process,the tool geometry of different wear types is established,and the 17-4PH stainless steel orthogonal cutting finite element model is established by DEFORM software.Based on the finite element model,the influence of tool wear on cutting temperature,shunt point and contact surface stress is studied,and the reliability of the wear model is verified by cutting experiments,and the law between the evolution of flank wear and cutting force is studied.The results show that the rake face wear can reduce the cutting force and cutting temperature to a certain extent,and the other wear forms increase the cutting force.With the increase of the wear VB of the rake face,the ploughing effect is significant,the cutting force increases significantly,but the stress change of the contact surface is not obvious.