Extrusion of 1050 aluminum circular tube with many spiral projections on inside wall

DOI Web Site 11 References
  • Murata Makoto
    The University of Electro-Communications, Graduate School of Informatics and Engineering and Intelligent Systems
  • Kuboki Takashi
    The University of Electro-Communications, Graduate School of Informatics and Engineering and Intelligent Systems
  • Yamazaki Hiroyuki
    LIXIL Corporation

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Other Title
  • 内面壁にスパイラル突起を有する1050アルミニウム円管の押出加工
  • ナイメンヘキ ニ スパイラル トッキ オ ユウスル 1050 アルミニウムエンカン ノ オシダシ カコウ

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Abstract

The extrusion components are used in many industrial fields, such as railroad vehicles, cars, heat exchangers and domestic articles. However, the demand of the component whose tube is not uniform on cross section is increasing. Circular tube of copper with spiral projections on the inside wall is used for the improvement of the heat exchange efficiency of the heat exchanger. The projections are conventionally manufactured by swaging. Some researchers tried to study the spiral projection on the tube, but nobody could make the tube. We modified the traditional extrusion machine and can successfully extruded the trial circular tube with many spiral projections. The extrusion was performed by the mandrel with set up many grooves. When the plastic flow of the billet was changed to angle of spiral direction by grooves of mandrel, the tube with the spiral projections was produced. Therefore the important extrusion condition is mandrel height which is the mandrel position in the examination. When the mandrel hangs out die, circular tube is trusted by the slot mandrel. As the mandrel height gets higher, the tube will be strongly trusted. The billet material is 1050 aluminum. We examine the extruded circular tube experimentally with the many spiral projections by using the mandrel with many spiral slots. Furthermore, we will have to make the characteristic and limit of the tube with the many spiral projections clear.

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