ファインセラミックスの超仕上加工 : 加工条件と被削性

概要

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The method to achieve a productive superfinishing of fine ceramics is investigated experimentally. The work materials used are alumina Al_2O_3,silicon carbide SiC, silicon nitride Si_3N_4 and zirconia ZrO_2,which are sintered under the atmospheric pressure, and Mn-Zn ferrite, which is sintered under HIP. The cutting ability of stone and the machinability of work material are evaluated using the function d^^-, which is composed of the finishing condition term and the measured term. The results are as follows. The superfinishing is efficient in the surface refinement of ceramics, when the diamond stone with the suitable bonding strength is used. The stone with low bonding strength should be used on ceramics of low machinability to create some new cutting edges in operation. For Al_2O_3 and Mn-Zn ferrite having high machinability, the stone with high bonding strength should be used to restrain the stone wear. The relation between specific finishing energy k_s and d^^- calculated from the experimental results is useful to evaluate the machinability of ceramics; the machinability is best in Mn-Zn ferrite and deteriorates in the order of Al_2O_3,SiC, Si_3N_4 and ZrO_2.
1991-07-05