Visual Measurement Method for Target Size Based on Torque

Abstract

With the rapid development of industrial technology, people have put forward higher requirements on the precision of process and assemblage for the part of the machine. In the process of accessory, a finish machining for the hole parts are generally necessary. There is greater impact on the processing accuracy because of the influence from the measurement methods, tool wear, lathe itself and other factors. In this paper, a regional centroid algorithm is proposed based on the visual measurement technology and mechanics principle. Firstly, the image of the workpiece is collected by the camera. And then the workpiece image is processed by the image processing technology. Thus, the torque of each pixel on the workpiece image contour relative to the center can be calculated. Finally, the detection and judgment of the part size is realized by the torque. Experiments show that this method can achieve accurate on-line detection for the inner diameter of the hole parts.