摘要
针对凸轮随动磨削中因工件轴转速差、伺服系统响应偏差、硬件制造误差等重复性误差影响因素造成的零件制造精度下降问题,将在线测量技术和Sinumerik 840D数控系统的插补表与电子齿轮功能应用到机床运动控制系统中,开展了随动磨削工艺的运动轨迹和控制方案分析,提出了由内嵌在系统PCU上的VB程序来处理在线测量获得的360个离散误差补偿数值,自动生成带插补表与电子齿轮功能的专用加工程序,利用同轴运动叠加控制方法,把补偿值叠加到进给轴上,使带误差补偿数据的凸轮加工NC程序不断根据实际加工状态更新,最后在工程样机上进行了磨削试验。试验结果表明,发动机凸轮轴的廓型最大加工误差降到了2.6μm以下,残余误差主要来源为机械振动、非线性摩擦扰动等随机性偏差。该运动控制和误差补偿方法能在实际加工中较好地补偿重复性误差因素对工件精度产生的影响。
Aiming at the problems of decline in accuracy caused by the cam servo grinding workpiece speed difference, the servo system response deviation, the hardware manufacturing errors and repercussion factors of repeatability error etc., the online measurement technology and Siuumerik 840D of interpolation table together with electronic gear function were applied in the machine motion control systems. After the analysis of the trajectory of the grinding process and control programs, a method of 360 pcs discrete error compensation value was posted through online measurement handling by the VB program embedded in the PCU system, automatically generated the specific processing procedures with interpolation table and electronic gear function by control method of the superimposing coaxial movement, the compensation value was superimposed to the feed axis. Finally, the cam machining NC programs with data of error compensation was updated according to the actual processing. The engineering prototype were tested. The test results show that the engine camshaft profile of maximum machining error is reduced to lower than 2.6 μm, the mechanical vibration and nonlinear friction disturbance are the main sources of residual error. The results show that the motion control and error compensation method can reduce the impact of the repeatability error factors on the workpiece accuracy.
出处
《机电工程》
CAS
2012年第6期636-639,644,共5页
Journal of Mechanical & Electrical Engineering
基金
国家高技术研究发展计划("863"计划)资助项目(2008AA042504)
关键词
凸轮轴
随动磨削
精度补偿
编程示例
camshaft
servo grinder
accuracy compensation
example program
