Calculation method for machining deformation caused by surface machining residual stress field

Abstract

The invention discloses a calculation method for machining deformation caused by a surface machining residual stress field. In the method, through the modeling and the analysis of a part surface machining residual stress field, the action of the surface residual stress field for deformation is equivalent to one group of surface force and edge force. Corresponding surface force and edge force is applied in a finite element model to finish deformation calculation caused by the surface machining residual stress field. Compared with a traditional method, the method disclosed by the invention needs a small unit number, does not have special requirements on mesh generation, a large-scale problem can be processed, and the application of the calculation method on the large blades of a steam turbine and an aircraft engine as well as a marine large-scale propeller becomes possible.

Description

Technical field [0001] The invention relates to the field of physical simulation of mechanical processing, in particular to the field of calculation of surface processing deformation of complex curved parts, and more specifically to a method for calculating processing deformation caused by a surface processing residual stress field. Background technique [0002] Processing deformation is a common phenomenon in the processing of mechanical parts. The deformation of the parts is due to the joint action of cutting force, cutting heat, the release of the residual stress of the substrate, the generation of the residual stress field of the surface processing and the machine tool fixture. Usually the size of this processing deformation is in the order of microns and can be ignored. But for large-scale components and thin-walled parts, this processing deformation is often in the millimeter level, close to the design tolerance of the part, which will greatly increase the rejection rate a...

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Problems solved by technology

[0004] Aiming at the shortcomings of existing calculation methods for processing deformation caused by residual stress fields in surface processing, the present invention aims to provide a method that can overcome the problems of being unsuitable for curved surfaces, consuming a large amount of computing resources, and being unable to deal with the existing two methods respectively. Calculation method of processing deformation caused by new surface processing residual stress field for large-scale curved parts, high requirements for mesh division and user experience, etc.

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