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为减少热误差对数控机床加工精度的影响,针对华中数控HNC-848型数控系统机床设计了一种嵌入式热误差补偿装置。该装置采用基于STM32+FPGA的嵌入式系统设计方法,实现机床温度数据获取、热误差建模、热误差补偿执行等功能。利用采集的前2 160组优化后机床测温点数据在STM32处理器内进行多元线性回归热误差建模,后2 160组优化后数据进行热误差预测。测试结果表明该装置热误差预测效果良好。通过在机床数控系统编写补偿子程序,利用该热误差补偿装置,实现了热误差实时补偿功能。
In order to reduce the influence of thermal error on the machining accuracy of CNC machine tools, an embedded thermal error compensation device was designed for Huazhong NC HNC-848 CNC machine tool. The device adopts the embedded system design method based on STM32 + FPGA to realize the function of machine tool temperature data acquisition, thermal error modeling and thermal error compensation. Using the collected data from the first 2 160 sets of optimized machine tool temperature measurement points, multiple linear regression thermal error modeling was performed in the STM32 processor, and after 2 160 sets of optimized data, the thermal error prediction was performed. The test results show that the thermal error prediction effect of the device is good. Through the preparation of compensation subroutine in CNC system, the thermal error compensation device is used to realize the real-time thermal error compensation function.