基于标定和插值的压装系统误差补偿

Press-mounting error compensation based on calibration and interpolation

传统的汽车零部件压装设备大都采用半闭环伺服控制方式,但由于存在系统误差,无法满足日益严格的零部件压装合格判定要求。本文针对半闭环伺服压装系统的误差特点,设计使用刚性块作为辅助装置进行误差标定,并通过最小二乘法拟合和误差表格插值,实现误差的补偿。经过对随机选取的实际生产数据进行误差补偿并与数显千分表实测值进行对比分析后得,补偿后的误差可以控制在1%左右,极大地提高了零部件压装合格判定的准确度。

Most of the traditional auto parts press-mounting equipment are of semi-closed loop control. Because there exits system error, it cannot meet increasingly stringent quality criterion. This paper analyzes the characteristics of semi-closed loop press-mounting systems, and use a rigid block as the auxiliary device to calibrate error. Then, error compensation is achieved based on the principle of least squares fitting. After comparing compensated randomly-selected production data with digital di- al gauge measured values, we concluded that the error after compensation can be controlled at about 1%, which greatly improves the accuracy of the eligibility determination of press-mounted parts.