사파이어 의료용 나이프의 연삭가공에서 지그의 탄성계수가 날 부 형상에 미치는 영향 : 제2보 탄성계수와 치핑 현상의 검증

Abstract

This study determines the selection of an appropriate jig material for the blade edge of the medicalsapphire knife. The physical properties of the jig material affects the edge shape and chipping phenomenon inmachining of the medical sapphire knife. If a grinding wheel is used, brittle workpieces such as sapphire areeasily damaged by the propagation of cracks because the grinding force significantly increases. It is importantto constantly maintain the grinding force in the grinding process of the brittle materials. The grinding forcecan be kept constantly by inducing the elastic deformation of the Jig material because the elastic deformationof brittle work-piece is negligibly low. The chipping phenomenon may be reduced by selecting the proper Jigmaterial. Aluminum, copper, stainless steels and carbon steel were used as Jig materials. The experiment wasconducted using a cast iron grinding wheel, which was installed on a conventional grinding machine with theELID grinding system. The thickness and width of the chipping area were measured using an opticalmicroscope and FE-SEM to analyze the shape of the blade edge. According to the experiment result, thechipping phenomenon decreased, and the sharp edge was formed when the jig materials with low elasticmodulus were used.