Papers by Author: Akihiro Sakaguchi

Abstract: It is very important that a grinding tool surface topography is measured and analyzed. In this paper, a line scan camera is installed in our three dimensional measurement system by shortening a measurement time. In this experiment, a diamond grinding wheel SD140Q100M is employed. As a result, the time can be reduced to about 24[s] from 1380[s]. On the other hand, a voronoi diagram is introduced as an evaluation method of a distribution of cutting edges on the grinding tool. According this method, the dispersion can be visualized. Furthermore, it is found that the voronoi region has a relation to a protrusion height of the cutting edge.

Abstract: Photovoltaic power, a well known renewable energy source, has been introduced on a global basis. A popular variation has many solar battery cells constituted by a polycrystalline or a single crystal silicon wafer. Therefore each cell’s conversion efficiency from solar energy to electrical energy is very essential. Recently, a fixed grain wire method, in which the wafer is sliced by a wire fixing grains on the surface with a bond or an electrodeposition, is employed in that slicing process. Thus, the wire surface topography must be obtained in order to sustain reliable accuracy. In this paper, the measurement method of a diamond wire surface topography using an image processing method is proposed. According to this method, the distribution of grains on the surface can be expressed numerically after grains are extracted from the captured images of the wire surface. Finally, the effectiveness of the proposed scheme was verified through a measurement experiment for a diamond wire.

Abstract: It is very important to measure a grinding wheel surface topography. Therefore a three dimensional measurement system of grinding wheel surface with image processing has been proposed. This system can evaluate a variety of the wheel surface topographies. For example, a histogram of the area or the shape of cutting edges and the distribution map of every shape of cutting edges were obtained. In this paper, a three dimensional model of the cutting edges and a correlation between the state of the wheel surface and grinding mark on the workpiece are reported and the effectiveness is evaluated through an experiment.

Abstract: Grinding process is a very efficient machining technology because innumerable abrasive grains are fixed on the surface of grinding wheel. Especially, the distribution and shape of cutting edges which directly affect grinding process have a big influence on accuracy. Thus, it is very important to measure a wheel surface topography from a viewpoint of evaluating the wheel life and the performance and a relation between the one and the roughness. In this study, a three-dimensional measurement system of a grinding wheel surface with image processing is developed. In this system, the distribution and height of cutting edges are analyzed because only cutting edges can be selected from among all abrasive grains.