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이희관,김연술,김도형,노상흡,양균의,Lee, Hi-Koan,Kim, Yeun-Sul,Kim, Do-Hyung,Roh, Sang-Heup,Yang, Gyun-Eui 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.4
This paper presents the formed tool to machine a milli-structure mold. The formed tool is used to machine the geometrical shape of bearing rubber seal for precision machining. The bearing rubber seal has milli-sized complex geometry. Because it is difficult to machine the unique shape exactly by the conventional tool, the formed tool is used in machining die of the bearing seal. In this paper, it is performed to investigate properties of the formed tool; tool wear, cutting force and machined surface roughness. Tool wear increases rapidly with clearance angle Increase. Thus, the dimension accuracy is affected by the clearance angle.
실험계획법에 의한 자동차용 러버실 금형가공을 위한 총형공구의 최적설계
이여해,임표,이희관,양균의,Lee, Li-Hai,Lim, Pyo,Lee, Hi-Koan,Yang, Gyun-Eui 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.4
A bearing is one of core parts in automobile. Rubber seal of the bearing is important to improve performance of bearing, formed by hot-press die of rubber seal for the intricate shape. In this study, formed tools are used to machine die of bearing rubber seal and the machining operation is classified into the several process of high precision. Design of experiments is used to optimize selection of the formed tools for the efficient machining of the hot-press die. The cutting force, tool wear and tool life are determined to characteristics. And, the clearance angle, the rake angle and the length cutting edge are considered as the major factors. Experiments are repeated to use one-way factorial design, and tool life is predicted by regression model.
Liquid metal을 이용한 고속 양면 가공 및 라틴 방격법에 의한 최적가공 조건 선정
임표(Pyo Lim),이희관(Hi Koan Lee),양균의(Gyun Eui Yang) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.10
This paper presents manufacture of mock-up by HSM and optimization of machining condition for high productivity in the view of manufacturing time and accuracy. The rapid machining of prototypes plays an important role in building mock-up. Rapid Prototyping(RP) is a technology to make prototype. But, it have many problems such as shrinkage, deformation and formation occurred by hardening of resin and stair shaping. On the contrary, high speed machining(HSM) technology has many advantages such as good quality, low cost and rapid machining time. HSM and RP is compared for machining efficiency. Experiments are designed by Latin Square Method and machining condition is optimized and selected by ANOVA. For example, propeller is machined by the surface machining of thin surface parts.
총형공구를 이용한 베어링 Rubber Seal 금형가공에 관한 연구
노상흡(Sang-Heup Roh),이희관(Hi-Koan Lee),김연술(Yeun-Sul Kim),김도형(Do-Hyung Kim),양균의(Gyun-Eui Yang) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.2
The formed tool is used to machine the geometrical shape of bearing rubber seal efficiently. The bearing rubber seal has complex geometry for the complicated geometrical shape to prevent leakage of lubricant oil and influx of the dust effectively. Because it is difficult to machine the unique shape exactly by the conventional tool, the formed tool is used in machining a rubber seal die. In this paper, It is performed to investigate machining characteristic of the formed tool; cutting edge wear, cutting force, and surface quality. Also, an efficient precision machining condition is proposed, and the inspection results of rubber seal with CAl are discussed.
실험계획법을 이용한 대형 사출물의 사출성형 해석과 검증에 관한 연구
이형수(Hyoung-soo Lee),이희관(Hi-Koan Lee),양균의(Gyun-eui Yang) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
The large injection molded parts technology such as instrument panel, front and rear bumper are presented for a precision molding. Some lead time and cost are required to product these part from design to mass product. Recently, CAE is widely used in product design, mold design and analysis of molding conditions to reduce time and cost. The optimal molding conditions can be obtained by DOE(Design of Experiment). The optimal design applications with CAE and DOE have been used in small molded parts. However, application to the large molded body is not reported. In this paper, optimization of injection molding process is studied for quality control in mass production of automobile bumper. Mold temperature difference is chosen through robust design of injection molding process, the molding process being optimized in term of shrinkage and deflection. The optimal conditions through DOE are validated by using injection molding analysis.
박원기(Won Ki Park),이희관(Hi Koan Lee),양균의(Gyun Eui Yang),문상돈(Sang Don Mun) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.6
Compressed air represents an energy source and an force-transmission medium for brake systems on medium-heavy and heavy-duty commercial vehicles. However, one disadvantage is the tendency of air to absorb moisture in the form of water vapor. This water vapor condenses once the air, which is heated during compression, cools back to ambient temperature upon emerging from the air compressor. The resulting condensation assumes the form of moisture in pneumatic lines, air tanks, cylinders and valve assemblies and can have negative consequences for the brake system and vehicle safety. The pneumatic systems on today’s vehicles are equipped with air dryers, in which the supplied air is dried according to the adsorption principle. In the systems, the compressed air flows through a granular desiccant with molecular sieves which captures the water molecules.