Error determination method and device for five-axis hybrid machine tool

By constructing a tool pose coordinate matrix and using a double non-uniform rational B-spline model, the motion error and contour error are distinguished, and error compensation is performed using a cross-coupled controller. This solves the problem of inaccurate error assessment in five-axis hybrid machine tools and improves machining accuracy and control accuracy.

CN122113370APending Publication Date: 2026-05-29TSINGHUA UNIVERSITY
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIVERSITY
Filing Date
2026-01-19
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In the machining process of a five-axis hybrid machine tool, existing technologies struggle to accurately estimate contour errors, leading to inconsistencies between error assessment results and actual workpiece surface deviations. Furthermore, the lack of uniformity in the dimensions of tool position information complicates error analysis and control.

Method used

The tool pose coordinate matrix of a five-axis hybrid machine tool is constructed, and combined with the double non-uniform rational B-spline (NURBS) model, the theoretical and actual tool trajectories are obtained respectively. The follow-up error and the contour error are clearly distinguished, and error compensation is performed through a cross-coupled controller.

Benefits of technology

This enables a more accurate assessment of the actual machining accuracy of a five-axis hybrid machine tool, avoiding analytical bias caused by directly treating follower error as contour error, and improving machining accuracy and control precision.

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Abstract

The disclosure provides an error determination method and device for a five-axis hybrid machine tool, relates to the technical field of hybrid machine tools, constructs a tool pose coordinate matrix, and combines a double non-uniform rational B-spline tool path model to be able to obtain a theoretical trajectory and an actual trajectory of a tool respectively. In error analysis, follow-up error and profile error are clearly distinguished: follow-up error only reflects the instantaneous deviation between the theoretical trajectory and the actual trajectory of the tool, and profile error is determined based on trajectory parameter correction and can truly reflect the deviation of the workpiece machining surface. In this way, the analysis deviation caused by directly taking the follow-up error as the profile error is avoided, so that the actual machining precision of the five-axis hybrid machine tool is more accurately evaluated. Moreover, the data in the tool pose coordinate matrix are all point coordinates, and the dimensions are unified, so as to facilitate the calculation of trajectory error.
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