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티타늄의 에어로졸 건조 윤활(ADL) 가공에서 온도 및 표면거칠기 분석
한정식,정종윤 한국산업경영시스템학회 2022 한국산업경영시스템학회지 Vol.45 No.4
The function of coolant in machining is to reduce the frictional force in the contact area in between the tool and the material, and to increase the precision by cooling the work-piece and the tool, to make the machining surface uniform, and to extend the tool life. However, cutting oil is harmful to the human body because it uses chlorine-based extreme pressure additives to cause environmental pollutants. In this study, the effect of cutting temperature and surface roughness of titanium alloy for medical purpose (Ti-6Al-7Nb) in eco-friendly ADL slot shape machining was investigated using the response surface analysis method. As the design of the experiment, three levels of cutting speed, feed rate, and depth of cut were designed and the experiment was conducted using the central composite planning method. The regression expressions of cutting temperature and surface roughness were respectively obtained as quadratic functions to obtain the minimum value and optimal cutting conditions. The values from this formula and the experimental values were compared. As a result, this study makes and establishes the basis to prevent environmental pollution caused by the use of coolant and to replace it with ADL (Aerosol Dry Lubricant) machining that uses a very small amount of vegetable oil with high pressure.
티타늄 가공에서 절삭력 분석을 위한 ADL 밀링 가공특성
한정식,정종윤,Han, Jeong Sik,Jung, Jong Yun 한국산업경영시스템학회 2022 한국산업경영시스템학회지 Vol.45 No.3
The purpose of using coolant in machining is both to increase a tool life and also to prevent product deformation and thus, stabilize the surface quality by lubricating and cooling the tool and the machining surface. However, a very small amount of cutting mist should be used because chlorine-based extreme pressure additives are used to generate environmental pollutants in the production process and cause occupational diseases of workers. In this study, medical titanium alloy (Ti-6Al-7Nb) was subjected to a processing experiment by selecting factors and levels affecting cutting power in the processing of the Aerosol Dry Lubrication (ADL) method using vegetable oil. The machining shape was a slot to sufficiently reflect the effect of the cutting depth. As for the measurement of cutting force, the trend of cutting characteristics was identified through complete factor analysis. The factors affecting the cutting force of ADL slot processing were identified using the reaction surface analysis method, and the characteristics of the cutting force according to the change in factor level were analyzed. As the cutting speed increased, the cutting force decreased and then increased again. The cutting force continued to increase as the feed speed increased. The increase in the cutting depth increased the cutting force more significantly than the increase in the cutting speed and the feed speed. Through the reaction surface analysis method, the regression equation for predicting cutting force was identified, and the optimal processing conditions were proposed. The cutting force was predicted from the secondary regression equation and compared with the experimental value.
한정식 중앙대학교 예술연구소 1993 中央大學校 藝術大學 創論 Vol.12 No.-
시간은 사진의 내용이자 형식이다. 사진이 사물을 대상으로 한다는 것은, 사물로 위장한 시간의 모습을 대상으로 함을 뜻한다. 우리가 대상으로 하는 사물이란, 특히 사진의 대상으로서의 사물이란 언제나 지금 현재로서의 사물의 형태다. 과거의 사물을 찍을 수 없듯 미래의 사물을 대상으로 할 수가 없다. 끊임없이 이어지는 현재속에서의 사물을 우리는 상대할 수밖에 없는 것, 그것이 사진이다. 거시적으로는 어제의 사물이 오늘의 사물이요, 내일의 사물일 수 있지만, 미시적으로는 일초의 간격을 두고도 쉬지 않고 변하고 있는 것이 사물인 것이다.