Method for separating related components of single-axis dynamic error instruction a numerical control machine tool

Abstract

The invention provides a method for separating related components of a single-axis dynamic error instruction of a numerical control machine tool. The method comprises the steps of synchronously collecting instruction position data generated by interpolation of a numerical control system, feedback position data of a servo feeding system and actual position data of the tail end of an actuator in single-axis feeding motion of the numerical control machine tool; calculating to obtain an in-loop dynamic error and an out-loop dynamic error; solving a first-order difference quotient, a second-order difference quotient and a third-order difference quotient of the instruction position data to obtain an instruction speed, an instruction acceleration and an instruction jerk, and separating instruction speed, acceleration and jerk related components of the in-loop dynamic error and the out-loop dynamic error; and finally, establishing a multiple linear regression model by adopting a multiple linear regression analysis method, and carrying out hypothesis testing on a regression equation and a partial regression coefficient. Separation of related components of the instruction speed, the instruction acceleration and the instruction jerk is achieved.

Description

technical field [0001] The invention belongs to the technical field of numerical control machine tools, and in particular relates to a method for separating relative components of single-axis dynamic error commands of numerical control machine tools. [0002] technical background [0003] The dynamic error of the feed axis of the CNC machine tool is related to the command speed, acceleration and jerk. With the increase of the command speed, acceleration and jerk, the dynamic error is also larger; therefore, in the high-speed machining of complex curved surface parts, the machine tool's Dynamic errors often exceed geometric errors and become the main factor affecting machine tool errors and part processing errors. At present, there are relatively mature detection and compensation methods for the geometric error of CNC machine tools, but there is a lack of corresponding detection and separation methods for the dynamic errors of CNC machine tools, which cannot support the evalua...

AI Technical Summary

Problems solved by technology

At present, there are relatively mature detection and compensation methods for the geometric error of CNC machine tools, but there is a lack of corresponding detection and separation methods for the dynamic errors of CNC machine tools, which cannot support the evaluation of the dynamic accuracy of machine tools and the traceability of dynamic errors. Engineering Applications

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