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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.
레이저보조가공을 위한 2-축 구동 매니퓰레이터 설계에 관한 기초 연구
김동현(Dong Hyeon Kim),차나현(Na Hyeon Cha),김태우(Tae Woo Kim),이춘만(Choon Man Lee) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.8
Laser assisted machining (LAM) is machining method that performs a machining for workpieces using laser beam preheating. LAM is in the early stage of its applications and has only been used in limited fields including turning, planning and micro end-milling throughout the world. LAM system should be able to move to the laser radiation direction and to rotate on a tool path for machining of complex shapes. A laser module with two-axis manipulator is designed in this study. It has been performed static structural analysis and shape modification of the manipulator. As the results of shape modification it has been obtained better results than the initial model. These results will be able to use in development of the two-axis manipulator.
토글 조인트장치를 이용한 가변예압장치 개발을 위한 기초 연구
최치혁(Chi Hyuk Choi),차나현(Na Hyeon Cha),이춘만(Choon Man Lee) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.3
To increase the machine accuracy by improving the stiffness of spindle bearings, preload was applied to the spindle bearings. The methods of fixed position preload, convertible preload, constant pressure preload, and variable preload are used to apply the preload to the spindle bearing. The previous studies performed by the author of this study were variable preload methods using rubber pressure and centrifugal force based on mechanical systems. This study proposed a toggle joint mechanism that could be applied to variable preload method using centrifugal force and rubber pressure to increase the preload. Also, a finite element analysis was conducted to predict the deformation of the rubber and change of the preload. And the analysis results showed that the preload by the device using rubber pressure only was increased by the toggle joint mechanism using rubber pressure.