Comprehensive Compensation and Repair of Trajectory Error of Five-Axis Linear Machining Tool Contact Point
During the five-axis linear interpolation process,the coupling of translational and rotational axes can cause non-linear errors in the tool contact point;at the same time,there are contour errors when fitting the workpiece contour with small lines.In order to reduce the comprehensive non-linear error(non-linear error and contour error),a method was proposed for compensating and repairing tool contact point trajectory errors.Based on the selected two processing data segments as the starting point and end point of the process-ing,the ideal tool center point and actual tool contact point during the interpolation process were calculated.By calculating the distance and vertical unit vector between the actual tool contact point and the ideal tool contact point trajectory line segment,the compensation direction of the contour error was calculated using the start/end tool axis vector and the ideal tool contact point trajectory vector.The ap-proximate contour error was calculated using the bow height error,and the tool center point was comprehensively repaired to achieve re-pair and compensation of trajectory errors.The application of MATLAB simulation calculation shows that after compensation and repair,the contour error is reduced by 74％and the nonlinear error of the tool contact point trajectory is reduced to less than 1.8 µm;in actual processing,the maximum surface roughness measured after compensation and repair is 1.240 μm,compared with before compensation and repair(6.667 μm),the reduction is 81.4％,which verifies the effectiveness of the proposed method.
five-axis linear interpolationcontour errornonlinear errorcompensation and repair
NETL
NSTL
万方数据
