面向钛合金切削的硬质合金涂层刀具切削热分配仿真研究

Simulation Study on Cutting Heat Distribution of Cemented Carbide Coated Tools for Titanium Alloy Cutting

切削钛合金时会产生大量切削热,研究切削参数、涂层种类及厚度对硬质合金涂层刀具切削热分配的影响可以延长刀具使用寿命,提高加工效率。采用Deform软件对钛合金进行车削模拟,并结合切削热分配的解析法研究得出:切削热分配系数随着切削速度的增大呈上升趋势,且切削温度也随之升高;切削热分配系数随切削深度的增大却呈下降趋势,即流入切屑的热量降低,但切削温度依旧随着切削深度的增大而上升;对于不同的涂层材料,导热系数越低,切削热分配系数越大;涂层厚度对于切削热分配系数基本无影响,涂层厚度越大,切削温度越高。研究结果可以为选择刀具涂层种类和优化切削参数提供参考。

There is a large amount of cutting heat generated while cutting titanium alloys.The study of the influence of cutting parameters, coating types and thicknesses on the cutting heat distribution of carbide-coated tools can prolong the service life of the tools and improve the processing efficiency.The Deform finite element software is used to simulate the turning of titanium alloy, and combined with the analytical method of cutting heat distribution.It is concluded that the cutting heat distribution coefficient increases with the increase of cutting speed, and the cutting temperature also increases.The distribution coefficient shows a downward trend with the increase of cutting depth, that is, the heat flowing into the chip decreases, but the cutting temperature still increases with the increase of cutting depth.For different coating materials, the lower the thermal conductivity is, the larger the cutting heat distribution coefficient is.The coating thickness has basically no effect on the cutting heat distribution coefficient, but the larger the coating thickness is, the higher the cutting temperature is.The research results can provide practical significance for the selection of optimized tool coating types and cutting parameters.