CHEN Dan Yang1, CAO Li2, LIN Yi Gao2, ZHANG Qiu kun2, ZHONG Shun cong2,3 *

 

(1. Zhangzhou Institute of Technology, Zhangzhou 363000, China;

 

2. Laboratory of Optics, Terahertz and Non destructive Testing & Evaluation, School of Mechanical

 

Engineering and Automation, Fuzhou University, Fuzhou 350108, China;

 

3. Fujian Key Laboratory of Medical Instrument and Pharmaceutical Technology, Fuzhou 350108, China)

 

 

Abstract: Aiming at resolving the problem of low efficiency of tapered roller appearance defect detection by visual method and the effect of human factor, an appearance defect detection system for tapered roller based on single slit diffraction method was developed. A CMOS camera was employed to capture the diffraction fringe images from damaged bearing roller surface. The series of images was subtracted by intact bearing roller surface. From the subtracted images, the defect detection could be carried out by the deformed diffraction fringes caused by the existence of defect on the surface of bearing rollers. Morphological algorithm was applied to deduce the image noise and also to enhance the image quality of diffraction fringe. It facilitated the effective defect detection of tapered bearing roller. In order to detect all areas on the taper roller surface, a rotating cylinder was used to rotate the roller by the friction force. The experimental results demonstrate that the developed system provide a high efficient, reliable and realtime tool for appearance defect detection of tapered rollers and therefore, it can be recommended for realtime defect detection of tapered rollers in bear industries.

 

Key words: single slit diffraction; tapered roller; morphological algorithm; diffraction fringe