Kiyoshi Yanagihara

Development of a High-Porosity Fixed-Abrasive Pad Utilizing Catalytic Effects of TiO2 on Polyurethane Matrix

Abstract A new method of manufacturing a high-porosity fixed-abrasive pad for grinding aluminum disks has been developed. In this development, it was discovered that the addition of ultrafine TiO 2 powders into polyurethane during the polymerization process can induce foaming of the polyurethane itself, which results in the highly porous structure of the grinding pad. The utilization of this effect for manufacturing fixed-abrasive pads make a porosity above 50% possible. The developed high-porosity pad provides not only load-free grinding, but also a wide selection of abrasive grains and a much finer surface roughness of 19.3 nm Rz compared with the polyvinyl alcohol (PVA) stone that is generally used for grinding aluminum hard disk drive (HDD) substrates.

Repeatable On-the-Machine Cutting-Edge-Forming Technology Applying Composite Electroplating and Anodic Electrolysis

Abstract If a cutting tool could be repeatedly formed without removal from a machine utilized in a cutting process, it would be highly beneficial in that it could reduce not only any positioning error due to a tool exchange, but also the consumption of scarce tool materials and energy. Composite electroplating to build up the cutting edge and anodic electrolysis to remove the worn-out plated layer, are utilized to realize this concept. Employing these processes, an on-the-machine edge-forming device has also been designed. The results of experiments indicate that, the device can complete all the processes within 4 minutes, and that the plated tools are able to cut JIS S45C (ISO C 45) steel.