Optimal design method for internal structure of machine tool body

Abstract

The invention discloses an optimal design method for an internal structure of a machine tool body. The optimal design method comprises topological optimization of the internal structure of the machine tool body and multi-objective optimization of thickness and height of a ribbed plate of the machine tool body. The topological optimization of the internal structure of the machine tool body comprises the following steps: establishing a body three-dimensional CAD (Computer Aided Design) model; determining a topological optimization region and a non-topological optimization region; establishing a finite element model of the topological optimization; determining boundary conditions; determining optimization objectives and constraint conditions and establishing a finite element model of the topological optimization; the multi-objective optimization of the thickness and the height of the ribbed plate of the machine tool body comprises the following steps: establishing a parameterized finite element model of the body according to the topological optimization result; designing sample points; determining optimization objectives and constraints; performing finite element analysis at the sample points to extract values of the optimization objectives and the constraints at each sample point; establishing agent models of the optimization objectives and the constraints; solving the multi-objective optimization problem. Through the method, the internal structure of the machine tool body is optimized, and the time is saved.

Description

technical field [0001] The invention relates to an optimization design method, in particular to an optimization design method for the internal structure of a machine bed. Background technique [0002] As the basic support of the machine tool, the bed plays a role in supporting the weight of the machine tool components that have a matching relationship with the upper surface of the bed and the weight of the workpiece to be processed. The deformation of the bed will directly cause the parts supported by the bed to tilt, which will affect the quality of the processed parts. Especially in precision machine tools, the deformation of the bed is more important, so the design of the bed has become a key technology for machine tool manufacturers. At present, a considerable number of machine tool manufacturers still use the traditional experience design and imitation method to design the bed. In order to achieve the expected goal, regardless of the cost, the designed bed also has the ...

AI Technical Summary

Problems solved by technology

[0003] In order to reduce the quality of the machine bed and improve the rigidity and other performances, the layout, shape and size of the bed ribs are mainly designed. Most designers of machine tool manufacturers use 3D software to build the model of the bed, and constantly modify the structure size of the ribs. Then import the finite element software for calculation, and repeat the above steps to find the optimal size. The optimization results obtained by this optimization method are accidental, and it takes a lot of time, which increases the labor intensity of the designer.

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