A device and method for measuring parallelism of guide rails

Abstract

The invention belongs to the field of control of manufacturing precision of a guide rail, and concretely discloses a measurement device and method for parallelism of the guide rail. An auxiliary measurement point is added between two guide rail pairs or on one side of the guide rail pairs, measurement points are disposed on the guide rail by the auxiliary measurement point, so that measurement points satisfy a point layout condition shaped like a Chinese character 'mi', each of the measurement points composed of the guide rail and the auxiliary measurement point is separately measured by utilizing a posture measuring head, a position of a time space linear reference generator of each of the measurement points on a measurement cross section of point layout shaped like a Chinese character 'mi' is measured to remain unchanged, and data of the measurement points on a same set straight line are measured; and then normalization processing is performed on the data of all the set measurement points on each of straight lines of the point layout shaped like a Chinese character 'mi', and the data of the guide rail are extracted after unifying to a same reference plane, thereby performing dataevaluation to obtain the parallelism of a measured guide rail. The device and the method have the advantages of simplicity and rapidity, high measurement precision, low cost, and the like.

Description

technical field [0001] The invention belongs to the field of guide rail manufacturing precision control, and more specifically relates to a device and method for measuring the parallelism of guide rails. Background technique [0002] With the needs of production and processing, machine tools continue to develop towards high precision and large scale. As an indicator of guide rail parallelism that has an important impact on machine tool performance, it has always attracted the attention of machine tool manufacturers, but there has never been a better one. Measurement method, especially when the span between guide rail pairs is relatively large. [0003] At present, the main methods of measuring the parallelism of guide rails are: using an autocollimator to measure, this measurement method has a large error when the span between guide rail pairs is relatively large; using mechanical auxiliary devices and dial gauges to measure Mechanical measurement method, this method has lo...

AI Technical Summary

Problems solved by technology

[0002] With the needs of production and processing, machine tools continue to develop towards high precision and large scale. As an indicator of guide rail parallelism that has an important impact on machine tool performance, it has always attracted the attention of machine tool manufacturers, but there has never been a better one. Measurement method, especially when the span between guide rail pairs is relatively large

[0003] At present, the main methods of measuring the parallelism of guide rails are: using an autocollimator to measure, this measurement method has a large error when the span between guide rail pairs is relatively large; using mechanical auxiliary devices and dial gauges to measure Mechanical measurement method, this method has low efficiency, low measurement accuracy, and is easily affected by factors such as the technical level of the measurement personnel; in addition, there is a dual-beam measurement method, which uses a dual-frequency laser Doppler interferometer for measurement, which does not require The interference mirror has the characteristics of simple structure and easy alignment, but this method uses two laser beams to complete the measurement, one of which is used to measure the displacement of the mirror group in the direction of the guide rail, and the other is used to measure the distance between the two bearing surfaces of the guide rail. The distance change (parallelism) between the two guide rails, this method has high measurement accuracy, the laser head does not move, only the optical lens moves, and the deviation of the linear position and the parallelism of the two guide rails can be measured at the same time, but the equipment is relatively expensive

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