In this research, textured surfaces on chrome molybdenum steel were processed by the wet blast technique. The friction behavior of the textured surfaces was investigated by a ball-on-plate reciprocating friction tester. In the 1^st report, the results indicated that the surface texture obtained by the wet blast technique using spherical zircon particles with an average diameter of 34.2 μm had a low friction coefficient in the initial test region, and the friction coefficient was stable in the end test region. Textured surfaces with different area rates of dimples were formed using spherical zircon particles with an average diameter of 34.2 μm. The results indicated that the surface textures with dimple areas of 23.0 % and 36.0 % had low friction coefficient in the initial test region, and the friction coefficient was stable in the end test region.

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We studied the internal stress field during three-dimensional cutting using the photoelastic method. Internal stress data were obtained with a polarizing high-speed camera and expressed as birefringence and azimuthal angle. First, transparent PMMA was cut two-dimensionally with a glass tool and the obtained photoelastic data were validated. Then, three-dimensional cutting was performed. The work was moved toward the high-speed polarizing camera and images were obtained from the other side of the rake face. The results indicated birefringence was separated in both the cutting direction and feed direction when the approach angle was decreased. Furthermore, the relations between the cutting conditions and birefringence and azimuthal angle were determined.

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The shape and distribution of abrasive grain cutting edges on the working surface of a grinding wheel are major factors affecting the quality of the finished surface. Features such as the distribution of abrasive grain cutting edge extracted by image processing have been analyzed. However, it is difficult to extract only abrasive grains when there are no differences in hue, saturation, or lightness between diamond abrasive grains and other regions on the working surface of the grinding wheel. Therefore, in the previous method using only images obtained with visible light, the grinding wheel that could be measured was extremely limited. In this study, we focused on the physical properties of diamond abrasive grains to resolve the previous problem. We tested image processing using images obtained with visible light and with ultraviolet light. The results indicated found that abrasive grains can be analyzed for various grinding wheels.

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