Six-freedom joint type coordinate measurement machine calibration method

A coordinate measuring machine and calibration method technology, applied in the direction of measuring devices, instruments, etc., can solve the problems of low actual precision of the measuring machine and insufficient sampling density, and achieve the effects of many sampling points, accurate calibration work, and rich postures

Inactive Publication Date: 2013-09-04
JIUJIANG PRECISION MEASURING TECH RES INST
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  • Abstract
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  • Application Information

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Problems solved by technology

This method ignores the spatial error distribution of the coordinate measuring machine, and the sampling density is not enough, which eventually leads to the actual accuracy of the measuring machine is not high

Method used

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  • Six-freedom joint type coordinate measurement machine calibration method
  • Six-freedom joint type coordinate measurement machine calibration method
  • Six-freedom joint type coordinate measurement machine calibration method

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Embodiment Construction

[0014] Taking an articulated coordinate measuring machine as the machine to be calibrated, using a metal rod 103 with cone sockets 102 at both ends as a standard length appliance, placing the metal rod 103 in the measurement space of the machine to be calibrated in different positions and different attitudes; Corresponding to each posture, use the hard probe 101 of the machine to be calibrated to collect point coordinates in the cones 102 at both ends of the metal rod 103, and a length can be obtained for every two points in different cones, and these lengths are used as sampling data The error parameters of the machine to be calibrated are obtained by using the least square method.

[0015] The selected length of the metal rod 103 is 10%-40% of the radius of the measurement space. Two small standard spheres with equal diameters are topped in the conical socket, and the length of the metal rod 103 is defined as the distance between the centers of the two spheres.

[0016]...

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Abstract

The invention relates to a six-freedom joint type coordinate measurement machine calibration method. A joint type coordinate measurement machine is used as a machine to be calibrated, metal rods with cone sockets at the two ends are used as standard length devices, the metal rods are arranged in a measurement space of the machine to be calibrated in different positions and at different postures, corresponding to each posture, a hard measuring head of the machine to be calibrated is used for collecting point coordinates in the cone sockets at the two ends of the metal rods, the length between the points in every two different cone sockets can be obtained, the lengths are used as sampling data, and the least square method is used for obtaining error parameters of the machine to be calibrated. The parameter identification precision can be further improved, and further, the integral precision of the measurement machine is improved.

Description

technical field [0001] The invention relates to a calibration method for a six-degree-of-freedom articulated coordinate measuring machine. Background technique [0002] The joint-type flexible coordinate measuring machine has the advantages of light weight, convenient on-site measurement, and high efficiency. It is an open-chain structure connected in series by various joints. The articulated coordinate measuring machine with six degrees of freedom is composed of six joints, each joint can rotate around its own axis, and the end of the structure is the measuring head of the measuring machine. A high-precision angle sensor is installed on each joint to record the rotation angle of each joint. When using a measuring machine for coordinate measurement, the coordinates of the measuring machine probe are a function of the structural parameters of the measuring machine and the angles of its six joints. [0003] Uncalibrated flexible coordinate measuring machine probe position...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B21/00
Inventor 潘勇赵克勤王吴雨方国庆曾悠兵
Owner JIUJIANG PRECISION MEASURING TECH RES INST
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