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Development of automotive engine cradle by hydroforming process
김기주,J. S. Kim,B. I. Choi,K. H. Kim,H. H. Choi,C. W. Kim,K. W. Kang,J. H. Song,C. W. Sung 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.10
The hydroforming technology may bring many advantages to automotive applications in terms of better structural integrity of the parts, lower cost from fewer part count, material saving, weight reduction, lower springback, improved strength and durability and design flexibility. In this study, the whole process of front sub-frame parts development by tube hydroforming using steel material having tensile strength of 440 MPa grade is presented. At the part design stage, it requires feasibility study and process design aided by CAE (Computer Aided Design) to confirm hydroformability in details. Effects of parameters such as internal pressure, axial feeding and geometry shape in automotive engine cradle by the hydroforming process were carefully investigated. Overall possibility of hydroformable engine cradle parts could be examined by cross sectional analyses. Moreover, it is essential to ensure the formability of tube material on every forming step such as pre-bending, preforming and hydroforming. At the die design stage, all the components of prototyping tool are designed and interference with the press is examined from the point of deformed geometry and local thinning.
자동차 피스톤용 AI-10Si 합금의 용융 산화 피막강도 측정 및 첨가원소의 영향
김기주(K.J.Kim),우정명(J.M.Woo),백영남(Y.N.Paik),김길수(K.S.Kim) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study was earned out to determine the strength of oxide skins of Al-10Si alloy melts and survey the effects of adding Mg. Cu. Ni and 1Cu-0.5Mg-2Ni as the practical alloy for automobile piston. This has been observed by Rotational Die Movement equipment for the temperature range from 600℃ to over ℃ and the oxidation time range from 10min. to 60min. and strength of oxide skins of the molten alloys were much more affected by oxidation temperature than oxidation time. Mg element was also more affected than any other elements. However, the effect of adding 1Cu-0.5Mg-2Ni alloy was located in the middle of alloy which had added Mg and which had added Cu and Ni.<br/>