Study on Grinding of Hypocycloid-Curved Rotor Made of Alumina Ceramics with a Small-Diameter Ball-End Electroplated Diamond Grinding Wheel
Takumi Imada*1, Tadashi Makiyama*2, Heisaburo Nakagawa*3,Yoshihide Hasegawa*2, Kenji Tomoda*2, and Keiji Ogawa*4,
*1Industrial Research Center of Shiga Prefecture
232 Kamitoyama, Ritto-shi, Shiga 520-3004, Japan
*2Heishin Techno Werke Ltd., Nagahama, Japan
*3Nakagawa Machining R&D Center, Wakayama, Japan
*4Ryukoku University, Otsu, Japan
The coating process of high-performance films, such as electrodes for lithium-ion batteries, requires high-precision transfer of settling slurries and high-viscosity liquids. This is because transfer characteristics, such as low pulsation and quantitative transfer, have a significant impact on product performance. A single eccentric screw pump is used in this coating process. One component of this pump is a complex-shaped rotor. This rotor must have high precision and high wear and chemical resistance. To meet these requirements, we applied alumina ceramics, which have excellent material properties, to the constituent materials of the rotor. However, for rotors with hypocycloid-curved surfaces, the development of a highly accurate and highly efficient alumina ceramic grinding technology is required. For this purpose, a free-form grinding technique using small-diameter ball-end electroplated diamond grinding wheels is indispensable. In the present study, we carried out machining experiments on inclined and cylindrical surfaces as a basic study. As a result, by increasing the grinding speed with a high-speed spindle, we achieved the precision, quality, and efficiency required for rotor grinding.
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