凸轮数控车削系统关键技术的研究

研究了基于数控车削加工凸轮的方法，并对数控车削凸轮的关键技术进行研究，提出了有效的方法，为凸轮的高效率加工提供了一个新的途径。一般在凸轮数控车削加工过程中，切削角与切削速度随加工凸轮轮廓位置不同会发生很大变化，为了实现切削角随凸轮轮廓位置实时变化，采用了高频响直线伺服电动机驱动刀具高频摆动的方法，实现刀具的位置实时控制。凸轮的轮廓是一个非圆截面，为了生成凸轮非圆截面，采用高频响直线伺服电动机驱动刀具往复高速运动，实现凸轮非圆截面的生成。车削凸轮时，切削速度一般需要保持恒定，这样有利于刀具的寿命延长，并保证凸轮表面的粗糙度，为了实现凸轮车削的恒定线速度，采用变主轴转速的车削方法，解决这个重要的切削工艺问题。

STUDY ON THE KEY TECHNOLOGY OF CAM CNC TURNING SYSTEM

At present, the common methods of machining cam still are milling or contour cam machining. This method has low product efficiency, and can not fit with the mass product requirement. The method of machining cam is studied based on the CNC turning cam, and research the key technology of CNC turning cam. The effective method is presented and one new approach is provided for cam machining. In general, during CNC turning cam, rake angle and cutting speed will change greatly along with the cam contour position changing. In order to ensure the rake angle as constant, employ high frequency linear servo motor to drive the tool sway with high frequency. To obtain the cam contour, uses the high frequency linear servo motor to drive the tool move to-and-fro with high frequency, so the tool will track the cam contour with real time. In order to ensure the cutting speed as constant, the new method is presented that the rotate speed of main shaft will change with the cam contour, by this method, the tool length will be prolonged and the external roughness of cam will be improved.