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송창규(Changkyu Song),이상돈(Sangdon Lee),조용주(Yongjoo Cho) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.11
It is very important to connect machinery and maintain it. This is usually done by bolt joint. There are two ways in connecting the bolt joint : the angle method and the torque method. The torque method is a method that let the clamping force maintain. The underhead of the bolt's head and the thread friction are the main influences. This study focuses on how the clamping force and friction coefficient change under the condition in vibrating the underhead of the bolt's head pan. As a result. under vibration condition, we found our that the clamping force increases, while the friction coefficient decreases.
볼트 체결시 진동을 이용한 체결력 증가 및 산포 감소에 관한 연구
송창규(Changkyu Song),이상돈(Sangdon Lee),조용주(Yongjoo Cho) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.11
It is very important to connect machinery and maintain it. This is usually done by bolt joint. There are two ways in connecting the bolt joint : the angle method and the torque method. The torque method is a method that let the clamping force maintain. The underhead of the bolt's head and the thread friction are the main influences. This study focuses on how the clamping force and friction coefficient change under the condition in vibrating the underhead of the bolt's head part. As a result, under vibration condition, we found out that the clamping force increases, while the friction coefficient decreases.
유체 전단열 발생을 고려한 저널 베어링 윤활해석에 관한 연구
송창규(Changkyu Song),이상돈(Sangdon Lee),조용주(Yongjoo Cho) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.11
Journal Bearing is hydrodynamic lubrication working that fluid exist between journal and bearing. Therefor, oil film formation is important at working journal Bearing. If oil film don't form, journal and bearing is contacted. And scuffing is occurred. Lubricating oil generate heat by fluid shear. If oil film is maintained, viscosity is important variable. Viscosity is sensitive to heat. Viscosity is changed by heat, and film thickness change.
이호철(Hocheol Lee),이남영(Namyoung Lee),송창규(Changkyu Song),박천홍(Chunhong Park),이후상(Husang Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper, we suggest a polishing head with a mechanical gimbals-like structure for the optics fabrication. In the small tool polishing processes, several types of polishing mechanism have been tried to get more deterministic and high efficient optical fabrication. The conventional polishing processes to use the contacting pad material of polyurethane or pitch need the higher polishing rate to shorten the overall polishing time for large optics. Therefore, new polishing head mechanism is designed to use the air backpressure and gimbals-like hinge structure to increase polishing velocity. In the following experiment, mechanical adaptability was confirmed both on the flat glass and the convex aluminum surface.