Method for optimally designing machine tool body structure

Abstract

The invention discloses a method for optimally designing a machine tool body structure, which comprises the following steps of: carrying out multiobjective optimization on wall thickness of a machine tool body and physical dimension of a rib plate; and carrying out comprehensive optimization analysis on the structure of the machine tool body, wherein the step of carrying out the multiobjective optimization on the wall thickness of the machine tool body and the physical dimension of the rib plate comprises the procedures of: establishing a machine tool body parameterized model; determining a boundary condition; determining a design variable, a restrict condition and a target function, establishing an optimization design model; and correcting the wall thickness of the machine tool body and the dimension of the rib plate; and the step of carrying out the comprehensive optimization analysis on the structure of the machine tool body comprises the procedures of: establishing a geometrical model of the machine tool body; determining a boundary condition; determining a topological optimization target, establishing a topological optimization model; and correcting the structure of the machine tool body. According to the invention, the traditional optimization design method of the machine tool body is changed, movable and static rigidity characteristics are improved, and the manufacture cost is lowered. The invention can be widely applied to the optimization designs of various machine tool support member structures.

Description

technical field [0001] The invention relates to a method for optimizing the structure of a machine tool support, in particular to a method for optimizing the structure of a bed. Background technique [0002] The bed is the main support of the machine tool, which supports the weight of the workpiece and the machine tool, and has become a key technology for machine tool manufacturers. However, most enterprises still follow the old path of empirical design and imitation. The design of the bed blindly pursues its high dynamic and static stiffness, but ignores the problem of manufacturing cost. For example, the weight of the TH series milling and boring machine bed accounts for more than 30% of the total weight of the machine tool. . Therefore, in order to reduce materials and reduce costs on the basis of ensuring the bearing capacity of the bed, it is necessary for the support to have a higher stiffness per unit weight, which affects the rationality of the distribution of the s...

AI Technical Summary

Problems solved by technology

Due to the complexity of the bed model, it is difficult to establish its parametric model with finite element software such as Ansys. Therefore, most engineers and technicians use the "optimized design method", that is, to continuously modify its structural dimensions in 3D software such as Pro / e, and then import The calculation is carried out in the finite element software, the process is repeated continuously, and the optimal solution is finally obtained. The optimization process cannot be called the optimal design, and it consumes a lot of time and increases the labor intensity of the analyst. The optimal solution is not absolute best value

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