Research on measurement method of grinding wheel profile based on image mosaic

Abstract

Grinding is one of the most effective processing methods of hard and brittle materials. In the grinding process, measurement of the grinding wheel profile is of great significance for evaluating the grinding wheel processing accuracy, detecting wear and compensating machining errors. In this paper, a novel grinding wheel profile measurement method based on an image mosaic is proposed to realize fast non-contact profile measurement. A profile template matching approach based on the profile search algorithm is constructed according to the characteristics of the wheel profile, and the complete grinding wheel profile is obtained and measured by a fast and accurate mosaic of profile images. The experimental results show that the proposed algorithm is more efficient and accurate compared with the traditional image mosaic algorithm. On the basis of this method, a measurement system for the grinding wheel profile is established and cylindrical and hemispherical grinding wheels are measured. The high-resolution complete cross-sectional profiles are obtained and the results are compared with a 2D laser profiler. The root mean squared error of the cylindrical grinding wheel is 0.08%–0.1% of the nominal radius. The center position deviation of the hemispherical grinding wheel is between ±3 µm and the radius deviation is below 0.08% of the nominal radius. The measurement results indicate the feasibility and precision of this method, which can realize non-contact rapid measurement of the grinding wheel profile.