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직류전위차법에 의한 피로균열 진전속도 측정시스템의 제작
배성인,차정환,김종섭,최수준 國立 昌原大學校 産業技術硏究所 1995 産技硏論文集 Vol.9 No.-
Automatic fatigue crack length measuring system using DC electrical potential method and the system control program for automatic fatigue testing under random load condition were made in this study. And using these system and control program, fatigue tests were executed under constant and random load condition. As the result, the propagation of crack in random loading can be represented Paris equation and log normal probability function. But, constant and random load test show different crack propagation properties.
성활경,박종권,최수준 國立 昌原大學校 産業技術硏究所 1995 産技硏論文集 Vol.9 No.-
In a turning machine, a chuck has an important role of an interfacer between a machine tool and an workpiece. Chuck determines productivity and efficiency of a turning machine. Research on a high -speed Lathe cannot be done without research on a high-speed chuck. High Speeding of a chuck has been hindered by the centrifugal force and the high stress induced by the centrifugal force. Effect of the centrifugal force has been reduced by the application of the shape optimization and the counter balancing.
李永文,崔壽準 慶北大學校 1989 論文集 Vol.47 No.-
This paper deals with the frictional characteristics of Glass-Fiber Reinforced Plastics (GFRP) on tool rake face (WC-insert, K10) depending on cutting speeds and feed rates in turning. Cutting forces, cutting ratios and chip flow angles were measured. And the frictional forces, the normal forces and the frictional coefficients were calculated using the established equations. The experimental results are as follows: (1)The frictional coefficient between tool and GFRP chip is relatively low compared with that of metal cutting (Rang:0.3∼0.6). (2)The values of the frictional coefficient are widely varied depending on the feed rates. This is because the anistropy of GFRP is greater than that of metals. (3)The values of the frictional coefficient increase gradually with the increase of cutting speed. This would be a result from the worse thermal conductivity of GFRP than that of metals.
이영문,최수준,우덕진 대한기계학회 1991 대한기계학회논문집 Vol.15 No.1
본 연구에서는 절삭가공시 생성되는 칩의 형상해석의 일환으로 2차원 절삭시 칩은 절삭날에 수직한 방향으로 공구경사면을 흘러간다는 기본적인 전제조건과 Kluft 등의 칩흐름각 예측에 대한 제안중 노으즈반경(nose radius) 및 기울임각의 영향을 중 첩시키고, 또한 절삭날에 연하여 미변형 칩두께(undeformed chip thickness)가 달라지 는 경우 칩흐름의 세기는 이에 비례한다는 Baart등의 가정을 도입하여 칩흐름각에 대 한 새로운 해석을 시도하였다. Chip flow angle is one of the important factors to be determined for the scheme of Chip Control. Up to now, however, a dependable way to predict the chip flow angle in practical cutting has not been established satisfactorily. In this paper a rather simple theoretical prediction of chip flow angle is tried based on some already widely confirmed hypotheses. The developed equation of chip flow angle contains the parameters of depth of cut d, feed rate f, nose radius $r_{n}$ side cutting edge angle $C_{s}$, side rake angle .alpha.$_{s}$ and back rake angle .alpha.$_{b}$. Theoretical results of chip flow angle given by this study bas been shown in a good agreement with experimental ones.s.s.s.s.