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정을섭,김성청,강연식 충북대학교 건설기술연구소 2003 建設技術論文集 Vol.22 No.2
In this study, experiments were carried out to investigate the characteristics of ceramic material s for grinding and wear process by diamond wheel. Normal component of grinding resistance of A1₂0₃was less than that of Si₃N₄ and Zr0₂. This seems to be the characteristics of ceramic material generating between toots and work pieces both of high hardness. For the case of Si₃N₄ and ZrO₂ as the grain mesh number of wheel increases, the surface roughness decreases. For the case of Al₂O₃, the surface roughness does not decreases, Specific grinding energy decreases as the chip removal rate increases. Si₃N₄ and ZrO₂ materials is grinded by abrasive wear processes but Al₂O₃ material is grinded by grain shedding process, i.e, brittleness destruction
정을섭,김성청,강연식 충북대학교 건설기술연구소 2003 建設技術論文集 Vol.22 No.2
We have studied the grinding characteristic for three kind of ceramics in diamond wheel grinding process, and have also found the optimal conditions to get the best surface roughness under above mentioned process for ceramics. Considering the wheel grains in grinding of Si₃N₄and ZrO₂ceramics, the surface roughness has related with the amount of load applying on wheel as varying the feed rate owing to the minute destruction phenomenon of grains in grinding of Si₃N₄ and ZrO₂ceramics. For the case of Al₂O₃. the depth of cut has related with the surface roughness as grinding is carried out by grain shedding process due to the brittleness destruction phenomenon. The major factors affecting the surface roughness and the optimum grinding conditions have also obtained by using the design of experiment.
정을섭,김성청,김태봉,소의열,이근상 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.3
In this study, experiments were carried out to investigate the characteristics of grinding and wear process of diamond wheel for ceramic materials. Normal component of grinding resistance of AL_2O_3 was less than that of Si_3N_4 and ZrO_2. This seems to be the characteristics of ceramic tools on work pieces both of high hardness. For the case of Si_3N_4 and ZrO_2 as the mesh number of wheel increases, the surface roughness decreases. For the case of Al_2O_3, the surface roughness does not decreases. Specific grinding energy decreases as the material removal rate per unit time increases. For the case of Si_3N_4 and ZrO_2, grinding is carried out by grain shedding process due to brittle fracture.