Off-line Compensation Method for Five-axis Machining Tool Deformation Error Based on Least Square Method

Abstract

The invention provides an off-line compensation method for a deformation error of a five-axis machining tool based on a least square method. The method comprises the following steps: firstly, obtaining a tool path data file according to machining parameters, and solving peak milling force along a tool coordinate axis direction at each cutter location point through a five-axis machining peak milling force model; secondly, selecting partial cutter location points at equal intervals, calculating the tool deformation amount based on a cantilever beam model, converting into a workpiece coordinate system, and iteratively compensating positions of the cutter location points and a cutter-axis vector according to a mirror image principle; and finally, fitting to obtain a function relationship between the deformation compensation amount and the corresponding milling force along the coordinate axis direction of each workpiece based on the least square method, solving the compensation coordinate positions of the rest cutter location points and the cutter-axis vector by using the function relationship, and obtaining a compensated tool path. Under the premise of not changing tools, the functionrelationship is applicable to the compensation processing of other tool paths under experimental conditions. According to the off-line compensation method for the deformation error of the five-axis machining tool based on the least square method provided by the invention, the tool deformation error caused by the milling force in the machining process can be reduced, and the compensation efficiencyis more efficient compared with the prior art.

Description

technical field [0001] The invention relates to an off-line compensation method for five-axis machining tool deformation error based on the least square method, which is of great significance for realizing high-precision and high-efficiency machining of complex non-developable ruled surfaces. The invention belongs to the technical field of mechanical machining. Background technique [0002] Complex surface parts are widely used in various fields of industrial manufacturing due to their good mechanics, fluid properties and design requirements. Such parts are often the key parts of the machine, featuring high precision, long life, and high reliability, and have high requirements for processing quality. [0003] Five-axis CNC machining is suitable for the processing and manufacturing of complex curved surface parts, but in the actual processing process, the tool will bend and deform due to the cutting force, which will affect the machining accuracy of the parts, which is a sour...

AI Technical Summary

Problems solved by technology

[0006] Based on the analysis of the force deformation of the tool in the five-axis machining process, the present invention provides a fast off-line compensation method for five-axis machining tool deformation errors based on the least square method, aiming at avoiding the prior art for all tool positions in each tool track All points are iteratively compensated, and the defect of milling force is repeatedly calculated in each iteration, on the premise of ensuring the machining dimensional accuracy of the part, the problem of low efficiency of offline compensation for complex parts is solved

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