Patent ID: 8310539
Filing Date: 2012-11-13
Classification: B23Q,G01B,G06T

Abstract:
1. A machine tool calibration method for calculating intrinsic parameters and extrinsic parameters of an image capturing device of a machine tool, the machine tool including: a moving body; a feed structure for driving and moving said moving body; a control device for controlling the movement of said feed structure; and the image capturing device, the image capturing device being provided to the machine tool for capturing an image of a preconfigured subject, the calibration method, comprising: a mounting process wherein the preconfigured subject having a calibration pattern, including one feature point, that is mounted on said moving body; an image-capture process wherein said feed structure moves said moving body, and said image capturing device captures images of said calibration pattern at several movement positions, and creates two-dimensional image data; a two dimension coordinate calculation process wherein, based on the two-dimensional image data of the calibration pattern that was created by said image-capture process for each movement position of said moving body, each said feature point on each two-dimensional image is extracted and the two-dimensional coordinates are calculated; a three dimension coordinate calculation process wherein said control device sends the movement positions of said moving body when said calibration pattern images were captured by said image-capture process, and based on received movement positions and locations of each said feature point for said moving body, the three-dimensional coordinates for each feature point that corresponds to each movement position of said moving body are calculated; and a parameter calculation process wherein the intrinsic and extrinsic parameters are calculated based on the two-dimensional coordinates and the three-dimensional coordinates for each movement position of said moving body that were calculated by both said two dimension coordinate calculation process and the three dimension coordinate calculation process, wherein said preconfigured subject is mounted in place of a rotating tool in said moving body that holds the rotating tool and said feature point is located on the same straight line as an axis line of the rotating tool which is held in said moving body.