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Flash Temperature Analysis on the Contact Surfaces between Cam and Roller-Follower Mechanism
구영필,김민남,김남식,Koo, Young-Pil,Kim, Min-Nam,Kim, Nam-Shik The Korean Society of Manufacturing Process Engine 2004 한국기계가공학회지 Vol.3 No.2
The flash temperature distribution on the contact surfaces between cam and roller-follower mechanism was analysed numerically. The elasto-hydrodynamic lubrication pressure and film thickness were used to get the accurate analysis results. The temperature distribution was obtained by numerical integration by making use of Carslaw and Jaeger's formulation to the whole contact surfaces. The maximum flash temperature was increased with both the increasing slip ratio of the contact surface and increasing external load Profile of the temperature distribution was affected by the sliding velocity of the surface.
구영필(Young-Pil Koo),김상준(Sang-Jun Kim),김형자(Hyung-Ja Kim),김영대(Young-Dae Kim),이규용(Kyu-Yong Lee) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
Tribological behaviour of the alumina disk against bearing steel ball and the wear mechanism of alumina-bearing steel pair in the water-lubricated condition were studied. Wear test was done with a ball-on-disk type tribo-meter. Bearing steel ball weighed down the rotating alumina disk. Distilled water was supplied continuously to the ball and disk interface as lubricant. The trend of coefficient of friction for sliding distance was investigated under the various loads and sliding speeds. The wear track was examined by SEM and EPMA to define wear mechanism. Coefficient of friction was decreased with increasing sliding speed and decreasing normal load. For a high speed, coefficient of friction was stable regardless of variation of the normal load. The wear mechanism of alumina-bearing steel pair was proved to be combination of abrasive wear, adhesive wear and tribo-chemical wear.
치면 프로파일 모델에 따른 기어 치면 내부의 응력 분포
구영필(Young-Pil Koo),김형자(Hyung-Ja Kim),김영대(Young-Dae Kim) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
The sub-surface stress field beneath the gear's contacting surface due to the contact pressure in lubricated condition has been calculated. To evaluate consequence of the clearance shape on the stress field, two kinds of tooth profile models were chosen. One is conventional cylinder contact model and another is new numerical model. The Love's rectangular patch solution was used to obtain the sub-surface stress field. The maximum effective stress of the new model is lower than the one of the old model and the depth where the maximum effective stress occurs is shorter at high load.