关键词: 实时补偿, 五轴机床, 误差模型

Abstract: The kinematics mathematic model of five-axis NC machine tools is established on the basis of transformation matrix. The machine errors are caused by both linear axis and rotation axis, therefore the compensation should be carried out for these two errors. A new decoupling method of five-axis NC machine tools is proposed. In the real-time error compensation process, the compensation of rotation axis is carried out firstly, in which the actual work piece posture is adjusted to ideal posture by rotating of the rotation axis, and then the compensation associated with the linear axis is determined and carried out accordingly. The new decoupling method can effectively compensate errors of five-axis machine tools, not only the precision is significantly improved, but also the movement interference of the axis is avoided in the compensation process, which is verified by both simulation and actual machining tests.

Key words: Error model, Five-axis machine tools, Real-time compensation