钛合金TC4切削温度变化规律仿真研究

Research on Regulation of Cutting Temperature Variation During Cutting Titanium Alloy TC4

以钛合金TC4为研究对象,在仿真计算中将切削区的温度分为切屑上的温度、已加工表面的温度和刀具上温度进行分析。分析结果表明,切屑上的最高温度、已加工表面的最高温度、刀具上的最高温度都随切削速度的提高而提高。如果在研究中选择的切削温度测量点为切屑上的点和已加工表面上的点,由于不同切削速度下切削温度变化率的不同以及测量仪器的响应速度和采样周期的不同,可能会出现切削温度随切削速度先增加后降低的结果。如果所选择的切削温度测量点为刀具上某点,则在切削过程中不会出现温度先上升后降低的现象。

The temperature of cutting area was divided into temperature of chip, temperature of machined surface and temperature of tool in the simulation of machining titanium alloy TC4. The simulation results indicated that the highest temperature of the chip, the highest temperature of the machined surface and the highest temperature of the tool were increased with the cutting speed increasing. But sometimes the measured cutting temperature would increase first then decrease with cutting speed increasing due to the different changing rate of cutting temperature or different sampling period and different response rate of the measuring equipment if the measuring points were selected at the chip or the machined surface. The result of the Salomon ＇s hypothesis would not occur during machining if the measuring point was selected at the tool.