五轴联动数控加工的装夹误差动态补偿方法

摘要

In 5-axis CNC machining, the work piece location deviated from the CAM programming coordinate because of the fixture offset, the addition move caused by the rotation center error can not be compensated by the normal coordinate translation in 3-axis machining. A 5-axis CNC machining fixture offset dynamic compensation methodology is proposed, the machining path is dynamically corrected in the rotation using machine inverse kinematics transformation and coordinate translation. The experiment present that the fixture offset is eliminated by the compensation to satisfy the high precision 5-axis CNC machining.%五轴联动数控加工中,由于工件装夹误差引起的实际加工基准与CAM编程基准不一致,其旋转中心偏差造成旋转附加运动无法由传统三轴加工中的坐标偏置方法补偿.文章提出五轴数控的装夹误差寻位补偿方法,在旋转轴转动过程中通过坐标变换和机床逆运动变换动态修正加工路径,使加工结果与设计一致.试验表明,采用该方法降低了五轴机床工件装夹要求,消除了装夹误差带来的精度问题,满足精密五轴数控加工要求.