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Factors affecting the accuracy of the three coordinate testing machine

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Factors affecting the accuracy of the three coordinate testing machine

Date of release:2018-07-06 Author: Click:

In addition to the error caused by the three coordinate measuring machine itself, there are many factors that may affect the accuracy of the measuring machine, resulting in measurement errors. Operators should understand these factors and avoid affecting the accuracy of parts measurement.

1. room temperature stability

As mentioned before, temperature is the biggest factor affecting the accuracy of the measuring machine. Accuracy correction once a year does not guarantee that the measuring machine can accurately measure the temperature changes. Especially when the season changes, the temperature of the engine room is different from that of the calibration. It is necessary to correct the error caused by the difference of grating temperature and gauge block temperature in the case of room temperature stability. This correction can be carried out according to season or ambient temperature.

2. the correctness of the compensation document

The compensation file is a compensation file generated by using dual frequency laser interferometer to detect the position, straightness and angle error of the measuring machine. The measurement software is based on the error compensation. Some operators often forget to install compensation files or lose the backup files in the installation of the measuring machine software, resulting in the error of the measuring machine and the accuracy of the machine. So the operator should keep the backup files well and know how to install the compensation files.

3. the correction of the head is correct. The purpose of the correct head correction is to correct the diameter of the ruby ball of the pole (measuring point), make the correction of the measuring point and get the position relation of the different head position. The errors generated during the calibration of the probe will be added to the measurement. Therefore, we must ensure accuracy and accuracy in this link.

We should pay attention to the following points:

1) keep the clean of the standard ball and the pole.

2) ensure that the measuring base, the probe, the measuring rod and the standard ball are firmly fixed.

3) enter the correct length of the measuring rod and the diameter of the standard ball.

4) to judge the accuracy of correction according to the shape error and the corrected diameter and repeatability of the gemstone ball (the diameter of the gemstone ball after the length of the lengthened rod is corrected is different).

5) when the positions of different probes are used, after calibration of all probe positions, the accuracy of the calibration is checked by measuring the coordinates of the spherical centers of the standard ball. The probe file saved after the probe is calibrate can be transferred out when the probe and the measuring rod are not moving. However, it is recommended that the probe be recalibrated if the measurement accuracy is relatively high.

4. measurement of changes in mechanical parts

When the measuring machine is used for a long time, especially when the environment is poor and the temperature fluctuation is large, the mechanical part will change, for example, the verticality, the length of the sorghum length measuring machine is attached to the poor measurement precision of the leg. At this time, the overhaul and accuracy check of the measuring machine are necessary.

5. the error of the shape of the measured parts and the correctness of the reference

Because the principle of the three coordinate measuring machine is to pick the points first, and then the software calculates and calculates the mining points. Therefore, when measuring machine, there are certain requirements for the shape error of parts. The repeatability of the measured parts is obviously worse when there are obvious burrs or trachoma, so that the operator can not give accurate measurement results. In this case, the shape error of the measured parts is controlled, and the diameter of the gems ball can be increased properly, but the measurement error is obviously larger. In the three coordinate measurement, the correct measurement method and the correct selection of datum datum are important parts of measurement. For example, when measuring the circle and measuring the line, we should choose the projection plane or the working plane, and select the first datum and the second datum correctly when setting up the part coordinate system, and how to choose the datum axis when the coaxiality is calculated. This requires mastering the measuring principle of the measuring machine and taking the correct steps according to the actual situation.

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Key word:Automobileinspectiontool,Autopartsinspectiontool,Automobileinspectionequipmentmanufacturer

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Contact: Lu Chunrong

Phone: 0513-81733686


Web site:

Address: 22 groups of Peach Village, Chengnan street, Rugao, Nantong.

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