A Contour Error Estimation Method for Three-Axis CNC Machine Tool

Abstract

The invention belongs to the precise manufacturing technology field and discloses a contour error evaluation method for a triaxial numerical control machine tool. The method comprises steps that (a),an ideal processing reference track is planned, a three-dimensional coordinate of each processing point of the reference track after interpolation is stored, and a three-dimensional coordinate of eachprocessing point of an actual processing track within each sampling period is monitored and stored; (b), reference position points of the reference track closest to the actual processing points are acquired; and (c), according to different position relationships between the closest reference position points and adjacent points of the closest reference position points, a contour error is evaluatedthrough employing different methods according to different situations. The method is advantaged in that the evaluation process needs no parameter information and no curvature information of the idealprocessing reference track, the method is suitable for occasions with relatively large curvature in the processing process, realization difficulty is low, computational complexity is small, the consumption time is short, timeliness is realized, and the application scope is wide.

Description

technical field [0001] The invention belongs to the technical field of precision manufacturing, and more specifically relates to a contour error estimation method of a three-axis numerically controlled machine tool. Background technique [0002] In recent years, with the rapid development of the manufacturing industry, the processing parts are becoming more and more sophisticated and complex, which makes the processing requirements of CNC machine tools in the field of precision manufacturing gradually develop towards high precision. The so-called high precision generally refers to high contour machining accuracy. The machining accuracy level of CNC machine tools directly reflects the technical level of national equipment manufacturing. [0003] In order to reduce the contour error in the NC machining process and improve the contour accuracy of the machined workpiece surface, a common method is to design a corresponding contour error controller based on the contour error inf...

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Problems solved by technology

[0003] In order to reduce the contour error in the NC machining process and improve the contour accuracy of the machined workpiece surface, a common method is to design a corresponding contour error controller based on the contour error information to achieve contour control with high machining accuracy. The existing estimation method Generally, it is necessary to refer to the curvature, differential and other information of the trajectory or use an iterative method to estimate the contour error. Such a method will limit the versatility of the estimation method, and there is a problem that the real-time performance is not strong because of the high-precision contour error estimation. The prerequisite for effective contour control. Therefore, how to quickly and effectively estimate the contour error in the NC machining process and how to establish a mathematical model for NC machining contour error estimation is a major problem that needs to be solved urgently.

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