Cutting depth prediction method and device suitable for abrasive belt grinding and polishing of complex curved surface robot

Abstract

The embodiment of the invention discloses a cutting depth prediction method and device suitable for abrasive belt grinding and polishing of a complex curved surface robot, and the method comprises thesteps: obtaining the stress distribution between a contact wheel and a workpiece through a finite element analysis method, correcting a Hertz contact model between the contact wheel and the workpiecethrough the stress distribution, and obtaining a stress distribution model; obtaining a plurality of path points on each path obtained after the path planning of the workpiece; and obtaining a cutting depth prediction model of each path point by combining the grinding and polishing time and the feeding speed of each path point according to the stress distribution model, and determining parametersof the prediction model based on the actual cutting depth. According to the method, the accurate stress distribution model can be obtained, and the cutting depth prediction model is further obtained,so that the normal force and the grinding and polishing speed in the grinding and polishing process are accurately controlled, the machining precision of the workpiece better meets the actual requirement, and the generation of waste materials is reduced.

Description

technical field [0001] The invention belongs to the field of robot automatic processing, and in particular relates to a cutting depth prediction method and device suitable for complex curved surface robot abrasive belt grinding and polishing. Background technique [0002] As a newly developed robot integrated application technology, machine abrasive belt grinding and polishing can not only replace low-efficiency, high-pollution manual finishing, but also can significantly improve productivity and manufacturing flexibility, especially for grinding and polishing aero-engine blades, overall Large batches of workpieces with complex curved surfaces such as blisks. Abrasive belt grinding and polishing is a flexible material removal processing method. Its characteristics are mainly reflected in the large elastic deformation of the contact wheel after contact with the workpiece during the grinding and polishing process, and the deformation size of the contact wheel will also change ...

AI Technical Summary

Problems solved by technology

Abrasive belt grinding and polishing is a flexible material removal processing method. Its characteristics are mainly reflected in the large elastic deformation of the contact wheel after contact with the workpiece during the grinding and polishing process, and the deformation size of the contact wheel will also change as the grinding and polishing force changes. Therefore, in the process of grinding and polishing, the amount of material removal on the surface of the processed workpiece is not easy to control, which reduces the processing accuracy of the workpiece

[0003] In the current technology, there is a method for predicting the cutting depth of grinding and polishing in the robot era considering the elastic deformation of the contact wheel. The contact problem between the contact wheel and the workpiece is described by the Hertzian contact model, and the distance between the contact wheel and the workpiece during the grinding and polishing process can be quickly obtained. contact stress distribution, but the Hertz model alone is only suitable for describing the two-dimensional stress distribution, and cannot accurately calculate the contact stress distribution between the contact wheel and the workpiece in the actual situation

Moreover, the depth-of-cut prediction model uses a linear material removal rate method, which can only predict the depth of cut for workpieces with ideal shapes, but cannot predict the depth of cut for workpieces with complex curved surfaces.

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