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Research of Automatic Detection Technology of Thread Parameters Based on CCD Vision

SHEN Shao-wei,YAN Shu-hua,ZHOU Chun-lei,LI E,TONG Hui-peng(College of Mechatronics Engineering and Automation,National University of Defense Technology,Changsha 410073,CHN)  
In order to real-timely and accurately 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 enhance the measuring accuracy,a non-contact thread parameter measuring system based on an array CCD was designed and achieved.And its optics imagery,preprocessing of images,edge detection,sub-pixel location and camera calibration were emphatically investigated,test and analysis software was excogitated,and corresponding experiments were studied.The results obtained indicate this system has advantages such as quick test,high precision and good repeatability.
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