基于机器视觉辅助测量的精密电火花刻伤方法与系统

Precise Electrical Discharge Engraving Grooves Method and System Based on Machine Vision Aided Measurement

传统电火花刻伤机在工作时只对电机动作进行反馈,刀片损耗带来的误差通常靠人为增加进给量进行补偿,难以保证刻槽的形状与尺寸公差。为了更精确地获得刻伤过程中的刀片损耗量,提升闭环控制的电机精度,提出了一种基于机器视觉辅助测量刀片损耗的电火花刻伤方法,并依此设计了一套刻伤系统。实验中使用该系统计算出的刀片损耗量和实际测量值的误差在±5μm以内,同时得到的刻槽实际测量深度与系统计算的刻槽深度的误差在±10μm内。

Traditional electric discharge engraving machine only gives feedback on the motor, and usually adds the feed rate manually to compensate for the error caused by tool loss, which is hard to guarantee the shape and the dimension tolerance of the grooves.In order to obtain the tool loss during the engraving process and improve the motor accuracy of the closed-loop control, an electric discharge engraving method based on machine vision aided measurement is proposed and a engraving system is designed.The experimental result shows that the error between tool loss calculated by the system and the measured value is within ±5 μm, the error between the depth of grooves calculated by the system and the measured value is within ±10 μm.