Curved surface tool path contour error compensation method based tool location point correction

Abstract

The invention belongs to the field of numerical control machine tool dynamic error compensation and relates to a novel contour error estimation method, particularly to a curved surface tool path contour error compensation method based tool location point correction. The method comprises, on the basis of identifying the servo gain of a machining feed shaft control system, estimating practical machining points off line according to a following error model and linear interpolation machining codes; estimating contour error vectors according to a method similar to accumulated chord length parametric cubic spline of ideal tool paths; computing the contour error compensation according to the components of the contour error vectors on every axis to obtain compensated tool location points and further to generate linear interpolation numerical control machining codes for practical machining. The curved surface tool path contour error compensation method based tool location point correction can improve the dynamic precision of a numerical control machine tool and is high in precision, stable in computation, free from online measurement, easy to implement and wide in application range.

Description

technical field [0001] The invention belongs to the field of dynamic error compensation of numerical control machine tools, and relates to a new method for estimating contour errors and a new method for compensating contour errors of curved surface tool rails based on modification of tool position points. Background technique [0002] In high-end equipment in the fields of aerospace, energy and power, there are many complex curved surface parts that require high contour accuracy, such as aero-engine blades and marine integral impellers. Taking the blade of an aero-engine as an example, if the accuracy of its profile is not up to standard, it will directly affect its aerodynamic performance, which will lead to major safety hazards in the operation of the aero-engine. At present, in order to ensure the processing accuracy of such parts, the processing efficiency is low, and it cannot meet the rapid development of aerospace, energy and power fields for a large number of high-pr...

AI Technical Summary

Problems solved by technology

However, this method needs to improve the structure of the servo control system of each feed axis of CNC machine tools, which reduces the applicability of highly integrated CNC machine tools

[0005] In summary, none of the current contour error estimation methods can estimate the contour error of large-curvature machining trajectory curves, and the contour error reduction method also has defects.

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