C-axis gyration center calibrating device and method based on double standard ball

Abstract

Provided is a C-axis gyration center calibrating device and method based on double standard ball. A machine tool is provided with an X-axis guide rail and a Z-axis guide rail; a C axis is provided with a rectangular supporting seat having a 3R clamp, and a vacuum chuck having a first standard ball; a transition is in connection with the 3R clamp and a second standard ball; a measuring sensor fixing piece is located in front of a Y-axis lifting platform and is provided with a white light confocal displacement sensor. The method comprises: adjusting the position of the first standard ball, driving the C axis and the white light confocal displacement sensor, aligning the spherical crown position of the first standard ball, and recording a position PR (x,y) to be set as a gyration center position of the first standard ball; installing the 3R clamp and the second standard ball on the supporting seat, executing the spherical crown top point scanning on the second standard ball, adjusting the position of the white light confocal displacement sensor, allowing the white light confocal displacement sensor to align with the spherical crown position of the second standard ball, and recording a position PS (x,y) to be set as a reference center position of the second standard ball; and obtaining delta P through difference calculation. The device and method guarantee the service life of an on-line measurement device, and avoid mechanical part interference in a processing process.

Description

technical field [0001] The invention relates to a device and method for calibrating with double standard spheres. Background technique [0002] At present, in the existing calibration methods of the center of rotation of the ultra-precision C-axis, most of them use a calibration device and method that combines a standard ball with a high-precision lever gauge or an inductance micrometer. Although such devices are used to achieve ultra-precision The calibration method of the center of rotation of the C-axis can accurately calibrate the spatial position of the center of rotation of the C-axis, but it cannot effectively transform the spatial position into the machine tool coordinate system. In the existing on-site detection system composed of white light confocal displacement sensors, a single standard ball is basically used to calibrate the centerline of the C-axis rotation, which requires the white light confocal displacement sensor to be fixed on the machine tool at all time...

AI Technical Summary

Problems solved by technology

[0002] At present, in the existing calibration methods of the center of rotation of the ultra-precision C-axis, most of them use a calibration device and method that combines a standard ball with a high-precision lever gauge or an inductance micrometer. Although such devices are used to achieve ultra-precision The calibration method of the center of rotation of the C-axis can accurately calibrate the spatial position of the center of rotation of the C-axis, but it cannot effectively transform the spatial position into the machine tool coordinate system

In the existing on-site detection system composed of white light confocal displacement sensors, a single standard ball is basically used to calibrate the centerline of the C-axis rotation, which requires the white light confocal displacement sensor to be fixed on the machine tool at all times, and cannot be removed from the machine tool. Therefore, it will bring inconvenience to the processing process and cause mutual interference between mechanical parts. At the same time, a large amount of chips will be generated during machine tool processing and cutting fluid needs to be sprayed, which will seriously affect the white light confocal displacement. Accuracy and service life of the sensor

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