A Dynamic Stiffness Optimization Method for Improving Dynamic Characteristics of Machine Tools

Abstract

A dynamic stiffness optimization method for improving the dynamic characteristics of a machine tool provided by the present invention is used to improve the dynamic characteristics of the machine tool, comprising the following steps: Step 1, collecting acceleration data on each test point on the machine tool; Step 2, constructing the overall machine tool Simplify the model of the machine tool to obtain the modal data; Step 3, combine the modal data and the stiffness sensitivity formula to determine the stiffness weak points of each structure of the machine tool; Step 4, determine the objective function of the structural stiffness distribution on each test point; Step 5, through the objective function Calculate the reasonable optimization value of the stiffness of each structure of the machine tool; step 6, compare the changes of the modal frequencies and amplitudes of each order before and after the optimization of the machine tool through the optimization value; Frequency is carried out with modal confidence criterion MAC to verify the reliability of the whole 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 requires not only low manufacturing cost and convenient operation of machine tools, but also high machining accuracy and stable machining performance when machining 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 headstock, column, slide plate, worktable and bed. How to rationally optimize the stru...

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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

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