Noncontact laser ray measuring method for internal threads

Abstract

A noncontact laser ray measuring method for internal threads includes: acquiring image information of a to-be-measured internal thread according to a laser triangulation method, using a controller for postprocessing to calculate various parameters of the internal thread, and judging whether a to-be-tested part (2) is qualified or not according to the various parameters of the internal thread to finally finish the whole test process. The process of acquiring the image information of the to-be-measured internal thread according to the laser triangulation method sequentially includes: using a laser (1) to emit laser beams to a selected tested portion of the to-be-tested part (2); after the laser beams are reflected at the tested portion, using a reflector (3) to transmit the reflected beams to an optical enlargement system (4); processing optical signals by an area array CCD (charge coupled device) imaging system (5), and transmitting the signals to the controller (7) for postprocessing. The noncontact laser ray measuring method for the internal threads has the advantages of high dynamic measurement resolution, high universality and high predictable economic values and social values.

Description

technical field [0001] The invention relates to the technical field of engineering detection, and in particular provides a non-contact laser line measurement method for internal threads. Background technique [0002] Internal thread detection is one of the representative and important basic problems that need to be solved in engineering detection, and it has important application value in the industrial field. For example: rapid detection, acquisition, application and production support of precision standard parts in the field of oil industry pipeline threads and machine tool processing. [0003] In industrial production, especially in machinery manufacturing, thread is the largest and most widely used structural element, which can be used for fastening, connection, sealing, transmission, force transmission and precise positioning. Therefore, threaded connections occupy an extremely important position in the machine building and instrument manufacturing industries. For dif...

AI Technical Summary

Problems solved by technology

[0010] 1. They must be manually operated directly, and the measurement accuracy is closely related to the operator;

[0011] 2. In many methods, the measuring instrument is in direct contact with the thread during the detection process, which results in damage to the thread and a decrease in measurement accuracy;

[0012] 3. Due to the limitations of the method, the accuracy of traditional thread measurement is relatively low;

[0013] 4. The whole measurement process is time-consuming and labor-intensive, and the work efficiency is low

[0014] For the above shortcomings, researchers have also spent a lot of energy to continuously improve the thread detection method

However, due to the limitations of theory and methods, the focus of its research is mainly on the data processing of thread detection and some optimization of traditional measurement methods, and it is difficult to make an essential change.

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