Workpiece coordinate system calibration method and device, numerical control machine tool and storage medium

Abstract

The application relates to a workpiece coordinate system calibration method, which comprises the following steps: detecting the end face of a workpiece on a machining table when the machining table is in a reference pose, obtaining first measurement coordinates of each first detection point under a measurement coordinate system; determining an initial normal vector of the end face according to the first measurement coordinates; the end face is perpendicular to a third workpiece coordinate axis of a workpiece coordinate system; adjusting the pose of the machining table based on the initial normal vector and the base vector of a third measurement coordinate axis of the measurement coordinate system, so that the third workpiece coordinate axis is parallel to the third measurement coordinate axis; detecting the workpiece to obtain second measurement coordinates of each second detection point under the measurement coordinate system; determining the axial vector of the first workpiece coordinate axis of the workpiece coordinate system under the measurement coordinate system and the first key coordinates of a workpiece key point based on the second measurement coordinates; and determining a calibration conversion matrix according to the axial vector, the first key coordinates and the second key coordinates of the workpiece key point under the workpiece coordinate system. The method can guarantee the machining precision of a numerical control machine tool.

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