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공작기계 주축설계에 영향을 미치는 베어링 파라미터에 관한 연구
여은구,김엽래,한강근,박면웅,이용신,유헌일 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.1
The purpose of this study is to investigate the effects of operation factors of a typical main spindle system of the efficiency of machine tool. In this study, both static and dynamic analyses of typical main spindle system of the machine tool are performed using a finite element method. These finite element results are then used to predict the bearing stiffness, the amount of heat generation as well as the bearing life in the spindle system. Effects of material type of ball-bearing, bearing-lubricant type and main spindle bearing preload are examined.
여은구,조선형,이용신 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.4
Formability in deep drawing process depends not only on a drawability of workpiece material but also on process conditions such as die punch corner radius, lubricant conditions, punch-die clearance etc. For instance, bending resistance should be reduced by increasing die round appropriately, drawing load should be minimized by improving the lubricant condition between die and material, and blanking load should be increased by selecting a pertinent punch round and by augmenting the friction resistance in punch. In this study, a multi-stage deep drawing process is analyzed using ABAQUS. The effects of formability factors, such as die shoulder radius, punch-die clearance and coefficient, are investigated, and the results are also discussed in detail.
여은구(E-G Yoh),유헌일(H-I Yoo),이용신(Y-S Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
The failure of forging die often occurs as a result of growth of microcracks-reffered as brittle damage. In this study, an analysis of brittle damage coupled with the thermo-elastic finite element analysis is presented. A damage function suggested by Krajcinovec is utilized and a thermomechanical continuum frame work is carried out with a brittle damage. Defined as a vector considering the shape of common microcracks in the brittle metals. An application of the proposed model to the die for the ball stud is given.<br/>