Threaded hole structure quality detection method

Abstract

The invention provides a threaded hole structure quality detection method. A CCD camera and an annular light source are used for quality detection of internal threads. The index items of the detection of the internal threads include external diameter, internal diameter, percentage of thread, number of thread teeth, tooth pitch, tooth depth, and the number of effective teeth. Identifiable ineffective teeth include broken teeth, missing teeth, foreign bodies and burr.

Description

technical field [0001] The invention relates to a method for detecting and calculating the quality of a series of thread indexes, in particular to a method for detecting the quality of a threaded hole structure. Background technique [0002] For internal threads provided on important parts, screws or screws need to be screwed in during installation. The problem that often occurs during the screwing process is that the quality of the internal thread causes the entire internal thread to slip or other damage occurs. Often due to damage to one internal thread, the entire important component will be scrapped and the loss will be large. In order to avoid the above-mentioned technical problems, it is necessary to perform quality inspection on the internal thread and the external thread on the screw in advance. After removing defective products, screw them in again. [0003] Because the screw or the external thread on the screw is located on the outside, it is easy to pre-detect t...

AI Technical Summary

Problems solved by technology

However, the detection of internal thread is not easy to realize. First, the internal thread is located in the hole, which is not easy to observe, especially the deep thread, which is also particularly difficult to detect.

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