成形铣齿加工过程中的切削热模型

为了获得铣齿切削时切削区域的温升分布,在分别对铣削热产生和传出的机理,以及刀具和工件之间几何关系分析的基础上,得出包含对应虚拟镜像热源的热源模型。考虑到剪切面热源和刀屑接触面摩擦热源对工件、切屑和刀具的温升作用效果的不同,根据傅里叶导热定律推导出顶刃切削时相应热源的温升计算公式,分别对3者的温升分布进行计算可以获得整个切削区域的温升分布。结果表明,铣削过程中温度随切削的深入而升高,在不改变工件和刀具材料的情况下,进给速度是影响切削温度的主要因素,改变刀盘转速对温升的影响不大。

Cutting thermal modeling in forming gear milling process

In order to obtain the temperature rise distribution in the cutting area during the gear milling process,based on the mechanism of milling heat generation and spread as well as the geometrical relationship between tool and workpiece respectively,the heat source model including corresponding virtual image heat source was established.Taking into consideration of different temperature rise effects of workpiece,chips and tool by cutting heat source and friction heat source of chip touching surface,and the corresponding temperature rise formula of heat resource when the top edge is in use based on Fourier heat conduction law,the temperature distribution of the workpiece,chip and tool can be calculated respectively to obtain the temperature rise distribution of entire cutting area.It is shown that the temperature during milling will rise with the deeper cutting,the feed rate is the main factor affecting the cutting temperature under the condition that the workpiece and tool materials are not changed while changing of the speed of the cutter has little effect on temperature rise.