Key host assembly structure optimization design method based on machine tool working state

Abstract

The invention relates to a structure optimization design method of a machine tool component, in particular to a key host component structure optimization design method based on a machine tool workingstate. The method comprises the following steps: A, performing multi-working-condition topological optimization based on a machine tool motion state; B, parameterization reconstruction is carried outon the geometric model combined with the optimized topological structure; C, optimizing the shape and the size based on multiple working conditions of the machine tool in the motion state; D, performing production state evaluation based on machine tool machining and assembling conditions. The method is not limited to an assembly structure needing to be optimized, but comprehensively considers complete machine mounting structures such as the motion connecting piece and the supported piece, and fully considers various motion states and various working conditions of the machine tool, so that theoptimized design index is closer to the actual working state of the machine tool, and the optimized structure is higher in reliability.

Description

technical field [0001] The invention relates to a structural optimization design method of machine tool components, in particular to a structural optimization design method of key host components based on the working state of the machine tool. Background technique [0002] With the development and upgrading of the manufacturing industry, higher and higher requirements are put forward for CNC machine tools, which not only require the machine tools to have high operation stability and processing effect, but also require the machine tools to have lower energy consumption and manufacturing costs. Therefore, in the design of machine tools, it is necessary to fully consider the dynamic and static stiffness of the machine tool structure to improve its stability, and at the same time realize lightweight design to reduce energy loss of moving parts, improve drive efficiency, and reduce manufacturing costs. [0003] Most of the traditional structural design methods of the key main eng...

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Problems solved by technology

[0003] Most of the traditional structural design methods of the key main engine components of machine tools focus on the "dumb and clumsy" artificial model parameter modification and repeated calculation and verification. This design method not only has low design efficiency, but also does not meet the high rigidity and light weight of existing machine tools. The design goal of

For this reason, some research institutions have begun to use optimization algorithms, size optimization, topology optimization and other technologies to optimize the design of the main machine tool support structures such as the bed and columns, but the current optimization design methods are basically based on a static state of the machine tool. It does not consider the load change caused by the center of gravity change or full stroke action of moving parts or rotating parts, which cannot meet the design requirements of machine tools under multi-movement conditions

Although some optimization design methods consider the dynamic performance of a single structure, they ignore the influence of the mass distribution of the upper connecting functional parts and the connection mode on the dynamic performance of the whole machine. In the state of the whole machine, only the dynamic performance of a single structure is optimized and not Not obvious, and may be counterproductive

In addition, in the design of the main support structure, the existing design methods fail to take the displacement of the key points of the supported functional components as an optimization constraint condition, so only the dynamic and static stiffness of the main support structure itself can be guaranteed, and its support rigidity cannot be guaranteed.

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