• 제목/요약/키워드: 멀티셀 튜브

검색결과 2건 처리시간 0.014초

세레이션형 미세 멀티셀 튜브 압출 및 접합강도 평가 (FE analysis of Extrusion Process and Estimation of welding strength for Micro Multi Cell Tube with Serration)

  • 이정민;김병민;조형호;강충길
    • 한국정밀공학회지
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    • 제22권9호
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    • pp.49-59
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    • 2005
  • This paper describes a development of the extrusion process and estimation of the weldability for multi cell tubes used to cooling system of automobiles. A study on extrusion process is performed through the 3D FE simulation in non-steady state and extrusion experimentation. Also, nano-indentation test is employed to estimate the weldability of tubes. Especially, An evaluation of the weldability using the nano-indentation is accomplished as compared with nano-hardness in welded part and in the others. Finally, the pattern of the mandrel defection is investigated according to shapes of the porthole and/or chamber.

포트홀 형상 변화를 고려한 Al 멀티셀 튜브 압출공정 해석 (FE Simulation of Extrusion Process for Al Multi Cell Tube According to the Changes of the Porthole Shape)

  • 이정민;김동환;조형호;김병민
    • 대한기계학회논문집A
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    • 제29권8호
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    • pp.1146-1152
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    • 2005
  • Recently, multi cell tube which is used for a cooling system of automobiles is mainly manufactured by the conform extrusion but this method is inferior as compared with direct extrusion in productivity per the unit time and in the equipment investment. Therefore, it is essential for the conversion of direct extrusion with porthole die. The direct extrusion with porthole die can produce multi cell tube which has the competitive power in costs and qualities compared with the existing conform extrusion. This study is designed to evaluate metal flow, welding pressure, extrusion load, tendency of mandrel deflection that is affected by variation of porthole shape in porthole die. Estimation is carried out using finite element method under the non-steady state. Also this study was examined into the cause of mandrel fracture through investigating elastic deformation of mandrel during the extrusion.