A method for optimizing the quality of large parts of machine tools to improve the dynamic characteristics of the whole machine

Abstract

The invention provides a method for optimizing the quality of a large part of a machine tool for improving the dynamic characteristics of the whole machine, which is used for lifting the dynamic characteristics of the whole machine. The method comprises the following steps: 1, collecting acceleration data on each test point of the machine tool; 2, constructing a whole machine simplified model of the machine tool and obtaining modal data; 3, combining the modal data and the mass sensitivity formula to determine the quality weakness of each structure of the machine tool; 4, determining an objective function of that structure quality distribution on each test point; 5, calculating the reasonable optimization value of each structure quality of the machine tool through an objective function; 6,comparing the changes of the modal frequency and amplitude of each step before and after optimization of the machine tool through the optimization value; 7, verifying the reliability of the whole method by using the modal confidence criterion MAC of each order modal frequency of the whole machine after the quality optimization of each structure of the machine tool.

Description

technical field [0001] The invention relates to the field of machine tool equipment, in particular to a method for optimizing the quality of large machine tool parts for improving the dynamic characteristics of the whole machine. Background technique [0002] With the continuous development of the world's manufacturing industry, the CNC machine tool manufacturing industry now not only requires low manufacturing costs and easy operation of the machine tool, but also requires it to maintain high processing accuracy and stable processing performance when processing workpieces. Therefore, improving the dynamic performance of CNC machine tools is the main goal that is constantly pursued in the machinery manufacturing industry. As one of the important structural parameters of machine tools, quality has a direct impact on the dynamic characteristics of the whole machine. Generally, the whole machine tool is mainly composed of large parts such as spindle box, column, slide plate, wo...

AI Technical Summary

Problems solved by technology

Although the method is correct, there are three shortcomings: first, the simulation design analysis optimization is an individual optimization for each structural part; second, the traditional methods of experience and analogy are still used in the design process to improve the dynamic characteristics of machine tool components; The method of finding quality weak links in the test of the whole machine product to modifying the quality weak links, and completing the structural quality optimization of each component of the machine tool at the level of the whole machine

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