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김형제(Hyung-Je Kim),김병탁(Byung-Tak Kim) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
A high-pressure hose is consisted of the inner and outer, middle rubber materials. The braid layers are included in the middle rubber. The hose is inserted into the metal fittings in the manufacturing process. In this process the hose is compressed in the radial direction by jaws to clamp the hose and metal fittings. In case that the clamping force is small, the oil in the hose can leak under the real operating conditions. The practical test of clamping force is performed by means of the measurement of separation force. In this paper, the variations of clamping force and the mechanical behavior characteristics of a high-pressure hose are analyzed with respect to the friction coefficient using the finite element method. The examination into results was focused on the clamping and separation forces between the hose and the metal fittings, which is displayed graphically with respect to friction coefficients.
김형제(Hyung-Je Kim),김병탁(Byung-Tak Kim),고성위(Sung-Wi Koh) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
A Hydraulic hose is composed of the rubber materials and braid layers to support the tensile force. A power steering hose is generally producted by the swaging process. The hose is subjected to various mechanical and thermal loads under the real operation circumstance, the oil in hose can leak at the parts of small clamping force. Jaw stroke, the kind of material, friction coefficient and the shape of metal fittings are an important factor in the hose efficiency and life. In this paper, the mechanical behavior characteristics of a hydraulic hose are analyzed with respect to the jaw strokes and friction coefficients using the finite element method. Investigations were focused on the variations of strain and stress at the maximum jaw stroke between the hoses and metal fittings, and the deformation shape of a hydraulic hose after the jaw release.
김형제(Hyung Je Kim),김병탁(Byung Tak Kim) 한국고무학회 2001 엘라스토머 및 콤포지트 Vol.36 No.3
N/A The rubber pads of a tank which undergo dynamic deformations with the sufficient amplitudes and frequencies lead to a considerable internal temperature rise due to the heat generation. The heat generation which is dependent on the viscoelastic characteristics of a rubber is due to the conversion of partial mechanical energy into thermal energy identical to the area of hysteresis loop. Heat generation without adequate heat dissipation leads to heat build-up and the excessive temperature rise exerts a bad influence upon the performance and the life of rubber products. In this paper, temperature distributions of the rubber pads of a tank track subjected to dynamic loads are obtained under the assumption of the steady state. Heat generation rates used in this finite element analysis are acquired through experiments and the computed temperature fields are displayed in isothermal contour regions.
다구찌 방법을 이용한 폴리아미드 성형품의 충전 불균형에 관한 연구
한규택,정영득,구양,김병탁,김형제,한성렬,Han, Kyu-Taek,Jeong, Yeong-Deug,Goo, Yang,Kim, Byung-Tak,Kim, Hyung-Je,Han, Seong-Ryul 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.4
Plastics is used to produce precise parts with an inclusion of a reinforcement material such as glass fiber or carbon fiber to improve the dimension accuracy. The plastic goods can be produced with inaccurate dimensions, low mechanical strength, or residual stress due to the over packing of cavity inside, if the filling balance of melt resin is not accomplished. To overcome this problem, it is necessary to design the runner system with the geometrical balance at the mold design stage. However, even if the balanced runner system is achieved, a severe filling imbalance is observed practically in a multi-cavity mold. In this study, experiments were performed with Taguchi method to achieve the filling balance in multi-cavity mold with a symmetric runner system, by the use of pure PA and PA with glass fiber 33%. The experimental results were investigated to understand the effect of related molding factors on the filling imbalance for two resins.
스웨이징 행정에 따른 고압호스의 변형 특성에 관한 연구
김병탁(BYUNG-TAK KIM),김형제(HYUNG-JE KIM) 한국해양공학회 2003 韓國海洋工學會誌 Vol.17 No.4
The mechanical components with high-pressure hoses are generally produced by the swaging process. The hoses are composed of the rubber materials and the reinforced braids to support tensile forces. In case they are subjected to high mechanical and thermal loads under severe operating conditions, the oil in hoses can leak at the parts of small clamping forces. In this paper, the deformation characteristics of a fiber-reinforced hose are analyzed with respect to the jaw strokes using the finite element method. The manufacturing process is modeled with a contact problem in consideration of a real situation, and the material properties based on the experimental results are used in the analysis. Examinations of the relationship between the swaging strokes and the deformation behaviors of the hose were made on the basis of the stress and strain values of the hose components. The relations between clamping forces and separating forces are also proposed, in order to estimate clamping forces corresponding to separating forces for the given model.