Error Compensation Method for Multi-operation Machining Process

Abstract

An error compensation method oriented to the multi-process machining process, which establishes the characteristic deviation representation method of the differential motion vector set of multi-contour points, so it can more accurately establish the datum-induced error model considering the actual datum contour; The multi-process error transfer model based on the multi-contour point differential motion vector set of irregular features is used to describe the generation and processing of errors caused by benchmarks, errors caused by fixtures and errors caused by processing of any irregular features in the process of multi-process processing. In the transfer process, based on the corresponding error compensation method, the three types of errors are comprehensively converted into equivalent machine tool tool path errors through the equivalent tool path model, so as to obtain the compensation value of each movement axis of the machine tool, which is used for the calculation of the tool path of the machine tool. Optimization, to achieve error compensation for multi-process processing, up to micron-level high precision, and can achieve a significant improvement in part accuracy at a lower cost.

Description

technical field [0001] The invention relates to a technology in the field of mechanical processing, in particular to an error compensation method for multi-process processing. Background technique [0002] With the rapid development of machining technology, the functions of mechanical parts are increasingly diversified, and the structure of parts tends to be more complicated. The production of most parts often requires multiple processes to be processed, especially the processing of complex thin-walled parts in key fields such as national aerospace, automobiles, and 3C. Different from single-process processing, in the process of multi-process processing, in addition to errors in this process, there are also transmission and accumulation of errors between upstream and downstream processes. However, the existing multi-process machining process error transfer model is based on the single-point differential motion vector feature representation, which makes it unable to be used ...

AI Technical Summary

Problems solved by technology

[0003] The present invention is aimed at the existing multi-process error transfer model, which is based on the characteristic deviation representation method of the single-point differential motion vector, which cannot describe the deviation generation and transfer process of irregular features, and cannot consider the reference error caused by the actual irregular reference profile , and the existing error compensation technology is only aimed at the single-process processing process of a single CNC machine tool, and has not considered the error transmission and coupling relationship between processes, and cannot be applied to defects such as multi-process processing processes. A multi-process processing process is proposed The error compensation method can be applied to any irregular feature, more accurately and universally describes the generation and transmission process of the error caused by the reference, the error caused by the fixture and the error caused by the processing in the process of multi-process processing, and it is the first to provide an error compensation method , easy to implement, easy to operate, can achieve micron-level high precision, and can significantly improve the accuracy of parts at a lower cost

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