ROBUST MODELING APPROACH OF THERMAL ERROR COMPENSATION BASED ON REGRESSION ORTHOGONAL DESIGN FOR BATCH OF CNC TURNING CENTER

摘要

In this paper a robust thermal error modeling and compensation approach for batch of CNC turning center is proposed based on the regression orthogonal experiment design theory. Firstly, Through the use of thermal error mode analysis, the number of thermal sensors has been reduced from 16 to four. Base on analyzing the existing approaches of the thermal error modeling, a new approach of regression orthogonal design is proposed, which combines the statistic theory with machine structures, surrounding condition, engineering judgments, and experience. The thermal error compensation system has been applied to a large batch of turning centers in daily production for more than two years and it has kept year-round accuracy. The workpiece diameter error has been reduced from 35 μm to 12 μm with the application of orthogonal regression modeling and compensation system of thermal error.