Longhole axis straightness measuring device based on self correction and measurement method thereof

Abstract

The invention discloses a longhole axis straightness measuring device based on self correction and a measurement method thereof. The measuring device comprises a tubular travelling mechanism and a self-centering rotary mechanism which is arranged on the front end of the travelling mechanism. In the invention, large-range measurement is realized by the travelling mechanism and the self-centering rotary mechanism and provides an effective technical means for correcting the precision of deeper bores. In addition, the self-centering rotary mechanism adopted by the invention realizes the continuous scanning of an inner section circle by the laser rotation principle, thus effectively reducing error resource and improving measurement accuracy. The measurement device of the invention can finish measuring in short time, effectively saves measurement time, has simple operation and good usability and can utilize a processor to carry out synergy processing of data so as to realize measurement automation.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection and relates to the measurement of the straightness of deep holes, in particular to a measuring device and method for measuring the straightness of the deep hole axis. Background technique [0002] Straightness measurement is the most basic item in the field of geometric quantity measurement, and it is the basis for the measurement of geometric quantities such as flatness, parallelism, perpendicularity, and coaxiality. Straightness measurement is also a very important content in the machinery manufacturing industry. It is called the four major factors affecting product quality together with dimensional accuracy, roundness and roughness. The straightness detection of deep hole axis is an important part in the processing of deep hole parts, an important means for quality control and management of deep hole parts, and a technical guarantee for implementing quality standards. The measu...

AI Technical Summary

Problems solved by technology

Among them, the laser collimation method takes the energy center of the collimated laser beam as the measurement reference, and the laser emitted by the laser is collimated and shot to the measuring element that can move in the deep hole, and the measuring element perceives the change of the actual center position of the measured section of the deep hole , the CCD installed on it can obtain corresponding images in real time, after image processing, the actual center position of each section to be measured can be obtained, and then the straightness of the axis of the deep hole can be obtained through straightness evaluation. This method is simple in principle and simple in equipment , the accuracy is high, but the measurement object is greatly affected by the size of the hardware. For slender deep holes, this method is difficult to achieve

The roundness method is to measure the roundness of the outer cylindrical surface or the inner cylindrical surface of each radial fixed-distance section successively, and obtain the center position of the section through data processing, and then evaluate it. This method also has high requirements for the measured object disadvantages, and its accuracy is low

For the lever method, the deep hole moves on the workbench during measurement, and the measuring element perceives the change of the center position of the measured section, and reflects it to the dial gauge for reading through the lever. This method is an approximate measurement, and its measurement accuracy is not high. heavy equipment

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