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Turntable error detection method based on multi-station etalon laser tracking system

A technology of laser tracking and error detection, applied in measurement devices, optical devices, instruments, etc., can solve problems such as cable disturbance errors

Active Publication Date: 2017-02-22
XI AN JIAOTONG UNIV
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Problems solved by technology

Because this method only uses the length measurement and does not need the angle measurement with relatively low measurement accuracy, its test accuracy is high; but it needs to fix the laser tracker (turret) on the turntable and rotate with the turntable, and the target mirror ( Cat's eye) is driven by the linear axis of the machine tool to measure at multiple positions, and it is easy to cause disturbance errors due to cables

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  • Turntable error detection method based on multi-station etalon laser tracking system
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  • Turntable error detection method based on multi-station etalon laser tracking system

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Embodiment Construction

[0070] The invention is based on a multi-station etalon laser tracker's numerical control turntable rotation error detection method, which includes two parts, a measurement scheme and measurement data processing.

[0071] 1. Multi-station simultaneous measurement scheme

[0072] 1) Use the reflector as the target mirror to be fixedly installed on the turntable of the machine tool through tooling. The initial center position of the target mirror is A 1 .

[0073] 2) Select the rotation center of the turntable as the origin of the coordinate system O, and the projection point from the initial center position of the target mirror to the turntable at the initial moment is A 1 ′ To OA 1 ′ Is the positive direction of the X axis, and the direction perpendicular to the face of the turntable through the O point is the positive direction of the Z axis, and the right-hand reference coordinate system O-XYZ of the measurement system is established.

[0074] 3) Put four laser trackers P j (j=1, 2, ...

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Abstract

The invention relates to a turntable error detection method based on a multi-station etalon laser tracking system. When measurement is carried out, a laser tracker is arranged at a fixed position according to certain layout, and the center of the laser tracker is defined as a base station position. A mirror is arranged on a turntable, and rotates with the turntable. According to the method, the mirror measures the turntable movement at different positions; the distance between each measurement point to the base station is used to determine the spatial position coordinate of the base station and each measured point through a BFGS optimization algorithm; the difference between the actual coordinate and the theoretical coordinate of each measured point is used to determine the spatial error of each measured point; an error separation equation is established through the transformation of a spatial right angle coordinate system; and six errors of the turntable are acquired by solving the equation. The method has the advantages of high precision and fast measurement, and is suitable for the rapid detection of turntable rotation errors of a numerical control machine tool.

Description

[0001] 【Technical Field】 [0002] The invention relates to the technical field of measurement of a rotary table of a numerically controlled machine tool, in particular to a method for detecting errors of a rotary table based on a multi-station etalon laser tracking system. [0003] 【Background technique】 [0004] Precision and ultra-precision processing technology is an important support technology for modern high-tech warfare, the basis for the development of modern high-tech industries and science and technology, and the development direction of modern manufacturing science. With the gradual heating up of international industrial reforms, comprehensively improving the development quality and level of China's manufacturing industry has become a major issue facing the scientific and business circles. In this overall strategic development process, the research and promotion of precision and ultra-precision machining play a very important role, especially in the major high-end manufact...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/03
CPCG01B11/03
Inventor 陈耀龙王涛王骁张承勇韩林
Owner XI AN JIAOTONG UNIV
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