Compensation System of Multiple Error Weighted Superposition in Numerical Control System

Abstract

A compensation system with repeated error weighted stacking in a numerical control system comprises an instrument for error measurement, a unit for adding error compensation files, an error file interpreter, an error compensation fitting algorithm arithmetic unit, a unit for calculating error compensation values and a servo position closed-loop controller for receiving error compensation value instructions. The unit for calculating error compensation values comprises a program code parser and an interpolator. According to the compensation system, the positioning accuracy and the repositioning accuracy of numerical control machine tools can be improved, accuracy debugging of tools is greatly facilitated for users, simultaneously, the weighting compensation operation for errors is provided, compensation adjustment of the whole measuring range is achieved, the weighting operation can be performed on a certain error compensation curve, therefore the users can improve the positioning accuracy of the numerical control machine tools continuously, and the installation debugging process of machine tools is greatly facilitated for the users.

Description

technical field [0001] The invention relates to the fields of precision control and precision machining, more specifically, an error compensation system in a numerically controlled machine tool. Background technique [0002] The positioning accuracy of the control axis of the CNC machine tool is an important index reflecting the performance of the machine tool and an important factor affecting the accuracy of the workpiece. Both high-precision CNC machine tools and high-end numerical control systems (CNC) need to use error compensation systems to improve the positioning accuracy of CNC machine tools. [0003] Modern CNC machine tools generally use the servo motor to directly drive the ball screw for position control, which reduces the intermediate transmission links, improves the dynamic characteristics of the transmission system, and avoids the cumulative error caused by multi-stage transmission. For higher-end CNC machine tools, full-closed-loop and semi-closed-loop machi...

AI Technical Summary

Problems solved by technology

[0012] It can be seen that when using the traditional error compensation system described above for error compensation, when using the results obtained from a certain measurement for error compensation, either the positioning accuracy after error compensation meets the requirements of the design index, and the setting of the error compensation function is completed, or After the error compensation, the positioning accuracy does not meet the requirements of the design index. After some adjustment methods, the error compensation value must be re-measured and re-compensated. The error compensation cannot be adjusted or added on the basis of the existing measurement and compensation results. The error compensation of re-measurement, the traditional error compensation system method has the disadvantages of complex operation, repeated work, and long working hours.

Images