Internal thread detection device and method

Abstract

The invention discloses an internal thread detection device and method and discloses a method for performing measurement and reconstruction on the upper surface and the lower surface of a thread respectively, and then thread parameter measurement can be achieved. Due to the fact that only the upper surface or the lower surface of the thread is measured each time, it is not necessary for a camera to capture a complete tooth form image at a time, the camera and a laser projector can be arranged outside a detection hole, and the limitation on the size of equipment is avoided. Through the method, complete shape information of the internal thread is obtained finally, and foreign substance examination and measurement of the depth, the pitch and the tooth form parameter of the thread can be carried out simultaneously. Because the majority of threads are made of metal, projection light performs specular reflection on a processing surface of the thread, the camera and the laser projector are arranged on the same side of the detection face, and therefore the camera can obtain clear projection light images beneficially; in addition, an automated surface splicing technology based on the optimization theory is put forward, the splicing accuracy of the upper surface and the lower surface of the thread is improved, a program can be implemented easily, automation of subsequent data processing is improved, and measurement operations are simplified.

Description

technical field [0001] The invention relates to the technical field of thread detection, in particular to an internal thread detection device and method. Background technique [0002] Thread processing quality is a basic and important quality control item in the industrial field. The main inspection items involved are: detection of foreign objects between threads, thread length (depth), pitch, and tooth profile. [0003] At present, there are mainly two kinds of detection methods that can be used for thread detection, contact and non-contact. Among them, the contact detection method includes measuring needle detection method, thread micrometer, and various types of thread gauge detection methods; the non-contact method includes tool microscope method and machine vision detection method. [0004] The contact thread detection method has the problems of easy wear of measuring tools, slow detection speed, and single detection parameters; although the non-contact detection metho...

AI Technical Summary

Problems solved by technology

[0004] The contact thread detection method has the problems of easy wear of measuring tools, slow detection speed, and single detection parameters; although the non-contact detection method does not have the former problem, it is still mainly used in external thread detection

The internal thread, especially the deep internal thread detection in small-diameter blind holes, is difficult or even impossible to detect because the existing equipment cannot go deep

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