Research Based on the CCD Vision Thread Parameters Automatic Detection Technology

The threaded connection is widely applied in the industry, its traditional examination methods all need manual operations, and their measurement precision is low relatively. For real-time and accurately to measure thread parameters such as thread angle (tooth-type half-angle), screw-pitch, lead, thread height, major diameter, minor diameter, pitch diameter, helix angle etc, and enhancing the measuring accuracy, a non-contact thread parameter measuring system based on an array CCD is designed and achieved. And its optics imagery, preprocessing of images, edge detection, sub-pixel location and camera calibration are emphatically investigated, test and analysis software is excogitated, and corresponding experiments are studied. The results obtained indicate this system has advantages such as quick test, high precision and good repeatability.