Numerical control method using the geometric error identification method and the geometric error identification methods, numerical control equipment and machining centers

摘要

PROBLEM TO BE SOLVED: To accurately identify geometrical errors of rotation axes of a machine structure including two rotation axes, with less measurement points.;SOLUTION: A geometrical error identification method identifies a geometrical error of a machine structure including two rotation axes combined at a prescribed angle. Two rotation axes are rotated once or more by a prescribed angle to move a measurement object point of the machine structure to at least three different positions separated from the origin of the machine structure. A difference vector D between a machine coordinate vector at movement destinations of the measurement object point and a logical machine coordinate vector not including an influence of geometrical errors is calculated. When geometrical errors of two rotation axes are denoted as unknown numbers and a vector representing an influence of the geometrical errors at the plurality of movement destinations is denoted as an error vector E, the difference vector D is represented by a linear regression equation with the error vector E as an explanatory variable and the difference vector D as a dependent variable. A regression coefficient is calculated by minimizing the deviation of the linear regression equation, and the geometrical error is identified by the regression coefficient.;COPYRIGHT: (C)2014,JPO&INPIT