✍ Scribed by H. Ohmori; I. Takahashi; B.P. Bandyopadhyay
No coin nor oath required. For personal study only.
Advanced structural ceramics, such as silicon nitride based materials, are of interest because of their unique physical and mechanical properties. However, the cost of grinding these ceramics, which is an integral part of their fabrication, is very high. The primary cost drivers in the grinding of ceramics are low efficiency due to low removal rates, high rates of wear of super-abrasive wheels, and long wheel dressing times. Ohmori, one of the present authors, has pioneered a novel grinding technology that incorporates in-process dressing of metal-bonded super-abrasive wheels, known as electrolytic in-process dressing (ELID). This technique uses a metal-bonded grinding wheel that is electrolytically dressed during the grinding process for continuous protrudent abrasive from superabrasive wheels. The principle of ELID grinding technology is addressed in this paper. Two types of silicon nitride based ceramics were ground under various conditions using ELID technology. With the application of this technology, a mirror surface finish was realized with a No. 4000 mesh-size wheel (average grain size = 4/zm). The results of these investigations are presented in this paper.
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