Dynamic stiffness optimization method for improving dynamic characteristics of machine tool

Abstract

The present invention provides a dynamic stiffness optimization method for improving the dynamic characteristics of a machine tool, in order to improve the dynamic characteristics of the machine tool.The method comprises the following steps: Step 1, collecting acceleration data at each test point on the machine tool; Step 2, constructing a whole machine simplification model of the machine tool, and obtaining modal data; Step 3, combining the modal data and the stiffness sensitivity formula to determine stiffness weak points of different structures of the machine tool; Step 4, determining an objective function of the structural stiffness distribution at each test point; Step 5, through the objective function, calculating a reasonable optimization value of each structural stiffness of the machine tool; Step 6, comparing the change of the modal frequencies and amplitudes in various orders before and after optimization of the machine tool through the optimization value; and Step 7, usingthe modal frequencies in various orders of the whole machine after each structural stiffness of the machine tool is optimized to perform the modal assurance criterion MAC to verify the reliability ofthe entire method.

Description

technical field [0001] The invention relates to the field of machine tool equipment, in particular to a dynamic stiffness optimization method for improving the dynamic characteristics of a machine tool. 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, stiffness 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, workbench and bed. How to r...

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 stiffness weak links in the test of the whole machine product to modifying the stiffness weak links, and completing the structural stiffness optimization of each part of the machine tool at the level of the whole machine

Images