燐脱酸銅管の引抜き拡管に関する研究(第一報)

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The tube-expanding is a process for expanding the end or any portion of a tube by drawing over the inserted plug. It is also applicable for obtaining various tubuler cross-sections for particular uses. The well-known one is to secure the tightness of tube-assembly in the tube-plate of boiler, condenser, heat-exchanger etc. The process can also be used for productions of composite-tubes (bimetallic tubes), for correcting outside & inside diameter of tubes as well as for obtaining bright-finish inside the tube-surface. Other than the so-called tube-expanding, known as expanding the tube-end or expanding the tube into the tubeplate, little has been reported in relation to the production of bimetallic tube or correcting outside & inside diameter of tubes, probably owing to the dimensional inaccuracy brought about by the said process. In the present paper, changes in wall thickness, length, outside & inside diameter, eccentricity, roughness of tube-surface and drawing forces under varying expanding conditions, have been reported. The materials for the experiments were phosphor deoxidized copper (both as cold drawn and annealed). The conclusions obtained were; (1) The wall thickness of a tube is decreased after expanding. (2) Wallthickness scatter is strikingly increased after expanding, both peripherally and axially. (3) The wallthickness scatter of a tube is increased by expanding process irrespective of whether or not the starting tube was annealed. (4) The inside appearance of a tube is improved by expanding. (5) The length of a tube is slightly decreased by expanding. (6) The drawing force for expanding is less by the annealed material than the cold drawn material and less by the smaller expanding rate. (7) The increased wallthickness scatters due to expanding can be decreased invariably by successive hollow sinking.

燐脱酸銅管の引抜き拡管に関する研究(第一報)

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