A fast on-line two-dimensional sizes measurement method for micro part

Xingping Wei, Jun Li, Xiaoyu Liu, Shiping Zhao

COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(2) 52-56

School of Manufacturing Science and Engineering, Sichuan University, Chengdu, SiChuan, China, 610065

In order to meet the manufacturing process of micro part, where the space is small，the production speed, temperature and vibration frequency are high, a novel method, which is used to measure the two-dimensional (2-D) sizes of the micro part fast and on-line, was proposed based on optical fibre image bundles and CCD camera. Double parallel lights were projected on the part symmetrically. The outline information of the part image on CCD camera through optical fibre image bundles and the part 2-D sizes can be obtained from the CCD camera. The optical fibre image bundles can be embedded into tool-set or fixed in limited space due to its small size, flexibility and bendability. Therefore, the method overcomes the bad influences from the part hard processing conditions effectively. Experiments were carried out to measure workpiece with dimensions of 6.124 mm x 0.424 mm. The results show that the measurement time was less than 0.2 second and the accuracy was up to 25um.