US 11,988,506 B2
Error identification method for machine tool, non-transitory computer-readable storage medium, and machine tool
Tetsuya Matsushita, Niwa-Gun (JP); and Takuya Kojima, Niwa-Gun (JP)
Assigned to Okuma Corporation, Niwa-Gun (JP)
Filed by OKUMA CORPORATION, Niwa-Gun (JP)
Filed on Jul. 6, 2022, as Appl. No. 17/810,883.
Claims priority of application No. 2021-113740 (JP), filed on Jul. 8, 2021.
Prior Publication US 2023/0010236 A1, Jan. 12, 2023
Int. Cl. G01B 5/012 (2006.01); B23Q 15/12 (2006.01)
CPC G01B 5/012 (2013.01) [B23Q 15/12 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An error identification method for a machine tool for identifying an error, wherein
the machine tool includes a table configured to secure a workpiece and/or a jig, a spindle configured to rotate a mounted tool around an axis line parallel to an upper surface of the table, and three translational axes orthogonal to one another and configured to relatively move the spindle with respect to the table, wherein
the error identification method comprises:
installing a calibrator including a sphere row A in which a plurality of spheres are linearly aligned and a sphere row B in which a plurality of spheres are linearly aligned in a direction perpendicular to the sphere row A on the table such that the sphere row A and the sphere row B are approximately parallel to respective two of the translational axes and measuring positions of a plurality of spheres of the sphere row A and the sphere row B using a position measurement sensor tool mounted on the spindle;
rotating the calibrator to a plurality of angles around a normal direction on the upper surface of the table to install on the table and measuring each position of the plurality of spheres of the sphere row A and the sphere row B using the position measurement sensor tool; and
identifying an error of the translational axis based on measured values in the installing and the rotating.