Abstract
The contour error cross-coupling control is very important to improve contour accuracy for the five-axis computer numerical control machine. The change in cutter orientation can cause the nonlinear motion of cutter tip, so the contour error calculation and compensation are very complex. For the five-axis computer numerical control machine with dual rotary tables, the forward kinematics model and inverse kinematics model are set up, and the influence laws of feed axis deviation to cutter tip deviation and cutter orientation deviation are studied. Then the simple and accurate calculation models for cutter tip contour error and cutter orientation contour error are established. Finally, the novel contour error cross-coupling control method based on kinematics model is developed. The experimental results show that the developed method can effectively improve contour accuracy of the five-axis computer numerical control machine.
Highlights
Five-axis computer numerical control (CNC) machine is an important processing equipment to realize high efficiency and high-quality machining for large and complex parts
The contour error is divided into cutter tip contour error and cutter orientation contour error, and the simple and accurate calculation models are established
Contour error cross-coupling control method based on kinematic model
Summary
Five-axis computer numerical control (CNC) machine is an important processing equipment to realize high efficiency and high-quality machining for large and complex parts. For the five-axis CNC machine, the contour accuracy is the most important factor to determine machining accuracy. The improvement of contour accuracy relates to whether the dynamic characteristics of five feed axes are matched.[1] Because the servo drive system of CNC machine is very complex, it is difficult to match the actual dynamic performance between five feed axes, which will reduce the contour accuracy. The research results show that the cross-coupling controller is a more effective way to improve the contour accuracy compared with the advanced single-axis servo controller.[2,3,4] The key technology to realize crosscoupling control is to establish real-time contour error calculation model and contour error compensation amount calculation method.[5,6]
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