한국소성가공학회:학술대회논문집 (Proceedings of the Korean Society for Technology of Plasticity Conference)
- 한국소성가공학회 2000년도 추계학술대회 논문집
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- Pages.74-77
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- 2000
포트홀 다이를 이용한 개량된 Al7003 중공압출재의 접합압력결정
Determination of Welding Pressure in the Porthole Die Extrusion of Improved Al7003 Hollow Section Tubes
초록
Porthole die extrusion has a great advantage in the forming of hollow section tubes difficult to produce by conventional extrusion with a mandrel on the stem. Because of the complicated structure of die assembly, extrusion process as a forming of hollow section tubes has been investigated experimentally Therefore, analytic approaches that are useful in profitable die design and in the improvement of productivity are inevitably demanded Welding strength is affected by many parameters, which are such as extrusion ratio, extrusion speed, die shape, porthole number, bearing length, billet temperature and mandrel shape. In this paper, the parameters, which are such as billet temperature, bearing length and tube thickness, are examined. The welding pressures are examined through 3D simulation of non steady state and compared with experimental results.
키워드