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김강석(Kang Seok Kim),황주호(Jooho Hwang),이득우(Deug Woo Lee),이상민(Sang Min Lee),이승준(Seung Jun Lee) Korean Society for Precision Engineering 2015 한국정밀공학회지 Vol.32 No.2
Ball and roller bearings are commonly used machine elements for supporting rotating motion about shafts in simple devices including bicycles, in-line skates, and electric motors, as well as in complex machines. Heat is generated by the friction in the bearings, which causes the temperature inside the bearing to increase. If the heat is not appropriately removed from the bearing, elevated temperatures may give rise to premature failure. It is, therefore, important to be able to calculate the temperature in the bearings due to friction. Here, we describe a method to estimate the frictional torque in bearings using an empirical formula developed using a method based on bearing analysis tool and the measured frictional torque in a spindle system. Thermal analysis of the spindle system including the bearings was achieved using the finite element method (FEM), and the bearing temperature was compared with measured data to verify the empirical formula.
김강석 ( Kim Kang-seok ),나환선 ( Nah Hwan-seon ),이현주 ( Lee Hyeon-ju ),김진호 ( Kim Jin-ho ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.1
In order to evaluate environmental effect on characteristics with tightening high strength bolts, Environmental factors and deficiency of workability are exmained. Test parameters are as follows; Wet, rust, only exposure to air, installation of two washers and a washer to opposite direction. For this, torque, torque coefficient, axial force and nut angle are obtained by using bolt testing machine. On a basis of the results obtained by experiments, the characteristics with tightening subjected to environmental factors were investigated and compared with normal condition.
김강석(Kim Kang-Seok),나환선(Nah Hwan-Seon),이현주(Lee Hyeon-Ju),김진호(Kim Jin-Ho) 한국구조물진단유지관리학회 2007 한국구조물진단학회 학술발표회논문집 Vol.11 No.1
In order to evaluate environmental effect on characteristics with tightening high strength bolts, Environmental factors and deficiency of workability are exmained. Test parameters are as follows; Wet, rust, only exposure to air, installation of two washers and a washer to opposite direction. For this, torque, torque coefficient, axial force and nut angle are obtained by using bolt testing machine. On a basis of the results obtained by experiments, the characteristics with tightening subjected to environmental factors were investigated and compared with normal condition.