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Multi-parameter model of articulated arm coordinate measuring machine and calibration method

A technology of a coordinate measuring machine and a calibration method, which is applied in the field of precision measurement, and can solve problems such as rotation accuracy errors and instrument measurement errors that cannot be corrected

Active Publication Date: 2021-02-09
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It makes it impossible to correct the instrument measurement error caused by the shaft shaking error composed of the rotation accuracy error, the axial movement error and the radial runout error

Method used

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  • Multi-parameter model of articulated arm coordinate measuring machine and calibration method
  • Multi-parameter model of articulated arm coordinate measuring machine and calibration method
  • Multi-parameter model of articulated arm coordinate measuring machine and calibration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] refer to figure 2 , the specific steps of determining the error value of the shafting rotation accuracy in the step S1 are as follows:

[0122] S101: Fix the plane mirror at the end of the rotating shaft, and lock the shaft system with a locking device;

[0123] S102: placing a dial indicator head on the surface of the plane mirror, rotating the rotating shaft, and leveling the plane mirror so that the change of the dial indicator is within 0.01 mm;

[0124] S103: placing the self-collimating light pipe horizontally above the tripod to ensure that the self-collimating light pipe is opposite to the plane mirror;

[0125] S104: The self-collimating light pipe is electrically connected to a computer, and the host computer program software is opened on the computer;

[0126] S105: Adjust the position of the self-collimating light pipe to ensure that the image of the cursor is displayed on the program software interface, and adjust the jump value of the image of the curso...

Embodiment 2

[0141] The step S2 performs error analysis to obtain the compensated shafting error curve function, and expands the shafting error curve function f(x) into a Fourier series as follows:

[0142]

[0143] Where k is the joint number, a 0 , a, b, and w are constants, which are calculated from the curve data. After the curve function is obtained, it is substituted into the shafting error mathematical model to calculate the probe coordinates of the instrument after compensation and evaluate whether the measurement accuracy of the instrument is improved.

[0144] Substitute the rotation accuracy signal obtained from the measurement into Equation (1) to obtain the rotation accuracy of the spindle, and obtain the rotation accuracy F i (θ i ) formula is as follows:

[0145] f i (θ i )=A i2 ×cos(θ i )+B i2 ×sin(θ i ) (2)

[0146] Among them, A i2 is the first parameter of the rotation accuracy of the i-th joint, B i2 is the second parameter of the rotation accuracy of the i-...

Embodiment 3

[0166] refer to Figure 5 , in the shaft system error of the articulated arm coordinate measuring machine in the step S3, the rotation accuracy error, the radial runout error and the axial movement error are added as superposition items of the joint offset, and the rotation accuracy error is taken as the A rotation error term, the radial runout error is a translation error term along the x-axis, and the axial movement error is a translation error term along the z-axis.

[0167] Adjacent two coordinate systems {X i , Y i ,Z i} with {X i-1 , Y i-1 , the homogeneous transformation matrix between Zi-1} is as follows:

[0168] A i =Rot(z i-1 ,θ i )Trans(0,0,d i )Trans(l i ,0,0)Rot(x i ,α i ) (8)

[0169] After adding the axis error, it is equivalent to adding rotation and translation motion on the basis of the original transformation matrix, and the transformation matrix becomes:

[0170] A i =Rot(z i-1 ,θ i )Trans(0,0,d i )Trans(0,0,G i (θ i ))Trans(l i ,0,0) ...

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Abstract

The invention discloses a multi-parameter model of an articulated arm coordinate measuring machine and a calibration method, relates to the technical field of precision measurement, expands a 23-itemerror model of an original articulated arm coordinate measuring machine into a 59-item error model, greatly increases the number of structural parameters of the error models of the articulated arm coordinate measuring machine, and improves the precision of the articulated arm coordinate measuring machine. According to the articulated arm coordinate measuring machine multi-parameter model and the calibration method provided by the invention, the shafting shaking error term is added on the basis of the original articulated arm measuring machine error model, the articulated arm coordinate measuring machine multi-parameter error model is established, and high-precision calibration of the articulated arm coordinate measuring machine is realized.

Description

technical field [0001] The invention relates to the technical field of precision measurement, in particular to a multi-parameter model of an articulated arm coordinate measuring machine and a calibration method. Background technique [0002] The articulated arm coordinate measuring machine is a non-orthogonal coordinate measuring system, which is usually used in industrial field measurement environments such as production workshops. It is easy to operate, flexible, and widely used. [0003] The articulated arm coordinate measuring machine is a brand-new technology-intensive, economical and applicable three-coordinate measuring equipment. It adopts an open-chain full-revolving joint structure and completely abandons the platform and guide rails of the traditional three-coordinate measuring machine, which makes the product weight and volume greatly improved. Reduced, the product price is greatly reduced, the convenience of use and the requirements for the use environment are g...

Claims

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Application Information

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IPC IPC(8): G01B21/04
CPCG01B21/045
Inventor 夏桂锁温志辉刘芳程强强程东方伏燕军
Owner NANCHANG HANGKONG UNIVERSITY
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