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    • 6. 发明公开
    • Tube and method of forming same
    • Rohr und Verfahren zur Herstellung。
    • EP0447251A2
    • 1991-09-18
    • EP91302205.9
    • 1991-03-14
    • HADLEY INDUSTRIES PLC
    • Humpage Roy
    • B21D39/03B21C37/15
    • B21C37/155B21C37/157B21D39/037
    • A polygonal tube is produced from metal strip by forming rows of recesses (15) and projections (16) along opposite edges of the strip and then bending the strip until each projection is received in a corresponding recess to form the tube.
      The projections are then squeezed between opposed surfaces (26,28) one inside and other outside the tube. The surface inside the tube forms a groove (27) in the tube wall at the inside of the tube, spreads each projection to take up any clearance between edges of the projections and boundaries of the corresponding recesses. The surface outside the tube allows the tube to remain flat.
    • 通过沿着带的相对边缘形成一排凹槽(15)和突出部(16),然后弯曲条状物,直到每个突出部分被容纳在相应的凹部中以形成管子,从金属条制造多边形管。 然后将突起挤压在一个内部的另一个外侧的相对表面(26,28)之间。 管内的表面在管的内部在管壁中形成凹槽(27),使每个突起分散以占据突起的边缘和相应凹部的边界之间的任何间隙。 管外表面允许管保持平坦。