Finite-element-based machine tool important part residual stress multi-process continuous modeling simulation method

Abstract

The invention discloses a finite-element-based machine tool important part residual stress multi-process continuous modeling simulation method. The method comprises the steps of important part model simplification and casting system three-dimensional modeling, important part casting process finite element simulation, important part casting stress field coefficient correction, important part machining residual stress simulation, and important part thermal aging process residual stress finite element simulation. Accordingly, multi-process continuous simulation of casting, cutting and thermal aging processes are implemented; a blind hole method test measurement value serves as a reference, a stress value of an important part casting simulation corresponding point is extracted, a test value ofthe corresponding point and a correction coefficient with the minimum simulation value error are fitted by applying a least square method through MATLAB, and then the whole casting stress field datais corrected; the calculation accuracy of finite element simulation is improved, and the technical purpose that the casting stress field obtained after a beam is corrected is guided into an ABAQUS accurately is achieved.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing, in particular to a finite element-based multi-process continuous modeling and simulation method for the residual stress of critical parts of machine tools. Background technique [0002] As the "workhorse" of the assembly manufacturing industry, the CNC machine tool's technical level and product quality are important symbols to measure the development of the manufacturing industry. The accuracy of domestic CNC machine tools will gradually deteriorate during use, and the accuracy retention of key parts of CNC machine tools is one of the main reasons affecting the accuracy of machine tools. Due to the complex structure of the critical parts of CNC machine tools, in casting, machining, aging treatment and other processes, the temperature change speed of each part of the critical parts is different, resulting in the generation of residual stress, and the deformation caused by the rele...

AI Technical Summary

Problems solved by technology

Due to the complex structure of the critical parts of CNC machine tools, in casting, machining, aging treatment and other processes, the temperature change speed of each part of the critical parts is different, resulting in the generation of residual stress, and the deformation caused by the release of residual stress inside the critical parts It is the main reason for the poor accuracy retention of CNC machine tools

[0003] At present, my country's machine tool production units do not pay enough attention to the residual stress of the critical parts of the machine tool, and the residual stress reduction process of the critical parts is not standardized, and the residual stress reduction effect has not been quantitatively analyzed and evaluated; while the blind hole test can only measure the residual stress The residual stress at a limited number of points of the heavy parts cannot obtain the distribution law of the overall residual stress of the critical parts during continuous processing, so that the relevant process control of the internal residual stress of the critical parts cannot be made, resulting in the internal residual stress of some critical parts during assembly. Larger stress, the release of internal residual stress in the later part assembly and machine tool service will cause deformation, which will reduce the geometric accuracy of critical parts. If the deformation is not large, aging treatment can be performed again. If the deformation is large, the parts may be scrapped, thus increasing production cost of the enterprise

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