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주축 전면부 칩 제거를 위한 압축공기 구멍 설계에 관한 연구
강동위(Dong Wi Kang),이춘만(Choon Man Lee) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.3
While Built-in Spindle is working in machining center, the tool is changed by ATC(Automatic Tool Changer) automatically. However, impurities could be stacked in front of spindle because of chips formation while machining, and positional error between spindle and tool could be generated. Compressed air holes are necessary for removal of the impurities. But, the diameter and number of compressed air hole are different for each built-in spindle in market. In this paper, flow analysis is carried out to find out the efficient figuration of the compressed air hole by using velocity and pressure distributions.
테이퍼 각을 가진 소재의 MQL 선삭가공에서 최적 윤활 조건에 관한 실험적 연구
김동현(Dong-Hyeon Kim),강동위(Dong-Wi Kang),차나현(Na-Hyeon Cha),이춘만(Choon-Man Lee) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.1
Many researchers are trying to reduce the use of lubrication fluids in metal cutting to obtain safety, environmental and economical benefits. The aim of this study is to determine the optimization lubrication conditions in minimum quantity lubrication(MQL) turning of workpieces with taper angle. This study has been considered about various conditions of MQL. The objective functions are cutting force and surface roughness. Design factors are nozzle diameter, nozzle angle, MQL supply pressure, distance between tool and nozzle and length of supply line. The cutting force and surface roughness were statistically analyzed by the use of the Box-Behnken method. As a results, optimum lubrication conditions were suggested and verification experiment has been performed. The results of this study are expected to help the selection of lubrication conditions in MQL turning.