硬质合金车刀主偏角对不锈钢切削热力学行为影响仿真

Simulation on Influence of Main Cutting Edge Angle of Cemented Carbide Turning Tool on Machining Thermodynamics Behavior of Stainless Steel

304不锈钢切削过程的热力学行为对其加工表面性能有重要影响。本文基于Deform-3D切削仿真平台,研究了硬质合金涂层车刀主偏角对AISI-304不锈钢切削过程热力学特性影响规律,重点关注切削温度、切削力和剪切区应力应变分布规律。研究结果表明,主偏角为75°时,工件温度最高,刀具温度平稳偏低,主切削力相对最小,有利于切削过程的平稳进行和刀具耐用度的提高。不同主偏角的切削条件下,应力最大值均沿剪切面切向由内向外平缓增大。随着主偏角的增大,剪切区应力集中现象沿剪切面切向外移。主偏角为75°时,高应变区远离刀尖,有利于降低切削过程剪切区剪切滑移对加工表面的负面干扰,提高切削表面质量和性能。

Thermodynamic behaviors of the 304 stainless steel cutting process have an important influence on the performance of the machined surface. Based on the cutting simulation platform DEFORM-3D,the influence of the main cutting edge angle of carbide coated turning tool for 304 stainless steel on the thermodynamic characteristics in the cutting process of AISI-304 is investigated, the cutting temperature, cutting force and distribution of stress and strain in the shear zone are emphasized.The research results show that the workpiece temperature is the highest under main cutting edge angle of 75°,the tool temperature is steadily low, and the main cutting force is relatively minimum, which is beneficial to the smooth progress of the cutting process and the improvement of tool durability. Under cutting conditions with different main cutting edge angles, the maximum stresses increase gently from the inside to the outside along the tangential direction of the shear plane.As the main cutting edge angle increases, the stress concentration in the shear zone moves outward along the tangential direction of the shear plane.The high strain zone is far away from the tool tip under main cutting edge angle of 75°,which helps to reduce the negative interference of the shear slip in the shear zone during the cutting process on the machined surface and improve the quality and performance of the cutting surface.