Method for optimizing dynamic characteristics of large parts of machine tools

Abstract

The invention provides a method for optimizing the dynamic characteristics of a large-part structure of a machine tool, which is used for optimizing the mass and the rigidity of the large-part structure of the machine tool. The method comprises the following steps: step 1, collecting acceleration data of each test point; 2, constructing a simplified model to obtain modal data; 3, according to themass sensitivity formula and the stiffness sensitivity formula, determining the quality weakness and the stiffness weakness of the machine tool large part structure; 4, determining a structural mass objective function and a structural stiffness objective function at each t point; 5, calculating that optimum value of each structural mass and the optimum value of the structural stiffness; 6, respectively comparing the changes of the mode frequency and amplitude of each step before and after the mass optimization and the stiffness optimization of the large part of the machine tool; 7, respectively verifying the reliability of the whole method by using the modal confidence criterion MAC of each mode frequency aft optimization of the mass and stiffness of the machine tool large-part structure.

Description

technical field [0001] The invention relates to the field of machine tool equipment, in particular to a method for optimizing the dynamic characteristics of large machine tool structures. Background technique [0002] The general machine tool is mainly composed of large parts such as spindle box, column, slide plate, worktable and bed. How to reasonably optimize the structural quality and structural rigidity of each large part has a profound impact on improving the manufacturing technology of CNC machine tools. [0003] At present, the machine tool industry still uses the traditional method of experience and analogy to design the static stiffness and strength of the machine tool, and has not fully realized the important influence of the dynamic characteristics of the machine tool on the performance of the machine tool. There are also some scientific researchers who have used simulation methods to design and study the dynamic performance of large machine tool structures. Alth...

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Problems solved by technology

[0003]At present, the machine tool industry still uses the traditional method of experience and analogy to design the static stiffness and strength of machine tools, and does not fully realize the important influence of machine tool dynamic characteristics on machine tool performance

There are also some scientific researchers who have used simulation methods to design and study the dynamic performance of large machine tool structures. Although the simulation methods are correct and scientific, they lack a set of methods from the actual product testing to find weak links in structural quality, weak links in structural rigidity, and to modify weak links in structural quality. Links, structural rigidity weak links, and finally complete the method of structural quality optimization and stiffness optimization of large machine tool structures

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