Development of superabrasive stone for mechanochemical superfinishing

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• 作者：Masahiro Higuchi ; Tomomi Yamaguchi ; Naomichi Furushiro ; Takashi Sugimoto ; Shoichi Shimada ; Noboru Matsumori ; Hidekazu Ogura
• 关键词：Mechanochemical superabrasive stone ; Cerium oxide ; Thermodynamic analysis ; Oxide layer ; Synergistic effect ; Smooth superfinished surface
• 刊名：Precision Engineering
• 出版年：2009
• 出版时间：January 2009
• 年：2009
• 卷：33
• 期：1
• 页码：65-70
• 全文大小：1553 K

文摘

One of the effective methods for obtaining an ultra-precision surface is utilization of the mechanochemical reaction that occurs at the interface between a tool and a workpiece. A thermodynamic analysis suggested that cerium oxide CeO₂ in contact with steel oxidizes the steel surface. Then, steel specimens embedded in CeO₂ powder were heated to 773 K in a vacuum, and their surfaces were closely analyzed by X-ray diffractometry. As a result, peaks of Fe₃O₄ together with α-Fe were recognized by their diffraction patterns. On the basis of this finding, vitrified superabrasive stones containing CeO₂, i.e., cBN/CeO₂ stones, were made and their performances were evaluated through the superfinishing of bearing steels. Experiments showed that cBN/CeO₂ stone is superior in surface finish to conventional cBN stone because of the synergistic effect of the mechanical action of the cBN abrasive and chemical action of the CeO₂ abrasive.