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김경석,김동수,장호섭,박찬주,장완식,정현철,Kim, Kyeong-Suk,Kim, Dong-Soo,Chang, Ho-Sub,Pack, Chan-Joo,Jang, Wan-Sik,Jung, Hyun-Chul 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.6
Recently, environment problems have effects on the electronic equipments. Security problems are presented. For security reasons, it is necessary to study electronic equipments. In this paper, we handle the Elasticity modulus on the polymer insulator by UV irradiation. The types of material are used in this experiment, is the EPDM (Ethylene Propylene Diene Monomer). For increasing the reliability, real material specimens are used. For this study, we used ESPI (Electronic speckle pattern interferometry), UTM (Universal thesting machine) device, Accelerated weathering tester. Through this measurement, we evaluated how much UV irradiation has effect on polymer insulator and how long does it take to change the polymer insulator. Also this paper will give a help in electronic industry and the method of measuring the insulator elasticity modulus of polymer could be utilized in life estimation and replacement time of the products of electronic equipment that is used in real industrial fields.
김경석,장완식,김성식 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.2
The purpose of this study is the development of professional measuring system of piston. Designed values are compared with values of measured data of oval shape piston and allowable range and deviation are printed out by using this system. Thereafter, it is able to measure ovality precisely and to estimate itw quality rapidly.
김성식,김경석,장완식,최정석 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.3
To make high accuracy cutting of long materials and a piston for the engines, it must be necessary to keep the themnal stability of spindle and tail stock in CNC lathe. If a object is clamped at the ends, the thermal expansion and cutting resistance, in cutting process, generate the deflection of cutting objects. Especially, in the case of a piston ring, piston ovality and piston profile, the influences of deflection are very serious. In order to solve the problems, most of piston cutting are worked under simply support. However, the prob-lems exist, yet. Therefore, this paper proposes the new structure of tail stock which can compensates the deflection.