Development of an Automated Optical Inspection System for the Geometric Accuracy of Circular Saw Blades

• Main Authors: Chiu, Jeng-Yu, 邱正宇
• Other Authors: Chang, Wen-Tung
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/8w5wvg

碩士 === 國立臺灣海洋大學 === 機械與機電工程學系 === 105 === Circular saw blades are fundamental cutting tools used to cut off materials. The geometric accuracy of saw teeth will affect the cutting performance of circular saw blades and the quality of cut-off surfaces. The geometric accuracy of saw teeth must be inspected to ensure the cutting performance and quality. Existing automated optical inspection (AOI) systems apply several machine vision modules to capture images of a saw tooth along different directions. Although the purpose of measurement can be achieved by the existing AOI systems, but higher hardware costs are required. This study aims to develop an innovative AOI system for the geometric accuracy of circular saw blades in order to reduce the hardware cost and also keep the quality and efficiency of measurement. This study applies only a single machine vision module in combined with a special optical path design and an optical path switching module to rapidly switch the optical paths for capture images of the saw teeth along the three orthogonal directions; also, a spindle-chuck module and a linear stage module are applied to construct a complete AOI system. This study realizes the automated optical measurement for the geometric accuracy of circular saw blades through the integration of precision machinery, motion control, logical control, machine vision, image processing and geometric measurement into a system. The design and construction of the hardware had been carried out, the functions of motion control, logical control, machine vision, image processing and numerical computation had been integrated and tested, and the automated measuring process and human-machine interface had also been developed. Experiments for measuring the geometric accuracy the certain circular saw blade products were conducted. The experimental results showed that the developed system could achieve a measuring time within 10 seconds to measure a single tooth, and could achieve a measuring repeatability within the range of 2 micrometers or of 0.2 degrees. Therefore, the developed system can reduce the hardware cost and improve the completeness of measurement. Also, it can actually accomplish the automated optical measurement for the geometric accuracy of circular saw blades and can meet the requirements of cutting tool related industries.