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가솔린 자동차 터보차져용 WGV head의 금속 분말 사출성형 해석
박보규(Bo-Gyu Park),박시우(Si-Woo Park),박대규(Dae-Kyu Park),김상윤(Sang-Yoon Kim),정재옥(Jae-Ok Jeong),장종관(Jong-Kwan Jang) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
The wastegate valve (WGV), one of the essential parts of a wastegate-type turbocharger for automobiles, is a very important part controlling the constant exhaust pressure. WGVs for gasoline vehicles operate in a harsh hightemperature environment. Hence, WGVs are typically made of Inconel 713C, which is a type of Ni-based superalloy. However, investment casting and precision machining are very difficult because of the hardness of the Inconel material. Recently, the metal injection molding (MIM) process has attracted considerable attention for parts used under hightemperature conditions. In this study, an MIM analysis for the head and other parts of the WGV is conducted using a commercial CAE program Moldflow. Further, optimal manufacturing conditions are determined by analyzing flow characteristics at various injection times. Moreover, to improve the accuracy of the analysis results, we compare the actual temperature of the mold during injection processing with that observed through the analysis.
트레일링 암 생산용 LFT-D 시스템에서의 압축성형 해석
박보규(Bo-Gyu Park),정진우(Jin Woo Jung),정한규(Han-Kyu Jung),박시우(Si-Woo Park),하동수(Dong Soo Ha),최현열(Hyen Yel Choi) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.6
Recently, CFRP composites are widely used as lightweight materials have with excellent mechanical properties and can beare widely used in various fields. In general, thermosetting resins are used for CFRP. However, in recent years, studies have been carried out using thermoplastic resins have been actively carried out to overcome the disadvantages of thermosetting resins. The LFT-D system is a molding method in which a fiber is directly cut to a the desired length while being impregnated with a thermoplastic resin to produce a compound and that is then press-molding molded to form the product. In this paper, before the production of the trailing arm, the compression molding analysis was carried out in order to grasp the problems that may occur during production. Through cCompression molding analysis was applied to calculate of the minimum press pressure and to compare and analysis analyze the molding conditions characteristic required to formfor forming the trailing arm.
김상윤(Sang-Yoon Kim),박보규(Bo-Gyu Park),정재옥(Jae-Ok Jung),조규상(Kyu-Sang Cho),정일섭(Ilsup Chung) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.4
Among the components of rotary hooks, a core component of an embroidery sewing system, a study was conducted to apply metal injection molding to the manufacture of a hook body and a housing that was very difficult to mechanical working. The correlation of feedstock, a mixture of binder and SCM 415 metal powder, and properties of the pressure-volume-temperature interrelationship, viscosity, specific heat, and thermal conductivity were measured. Injection molds for the hook body and the housing were developed through injection molding analysis using these properties and conducted injection tests. Optimal injection gate position and number, injection pressure, and injection time were obtained through a comparison of analysis results with the experiment results.
중수로 압력관의 크리프 처짐 해석 기법 및 프로그램 개발
심도준(Do-Jun Shim),허남수(Nam-Su Huh),박보규(Bo-Kyu Park),장윤석(Yoon-Suk Chang),김윤재(Yun-Jae Kim),김영진(Young-Jin Kim),정현규(Hyun-Kyu Jung) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Estimation of the CANDU pressure tube deflection is important since the deflection may cause significant structural failure due to hydrogen diffusion and blister. However, there is no appropriate engineering model to estimate it exactly. The purpose of this paper is to propose a new analysis method and program to resolve this issue. For development of proper analysis method, a series of finite element analyses has been carried under elastic-creep condition. In addition, for effective estimation of the creep deflection, an analysis program named PC-DAS was developed based on the proposed method. Comparison of simple case study results with corresponding reference ones showed good agreement. Therefore, the proposed method and program can be utilized as one of valuable toolkit for integrity assessment of CANDU pressure tube.