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    • 10. 发明授权
    • Method and device for expanding metal tubes
    • 用于扩展金属管的方法和装置
    • US5640879A
    • 1997-06-24
    • US312267
    • 1994-09-26
    • Herbert DamsohnWerner HelmsRoland HemmingerWalter Wolf
    • Herbert DamsohnWerner HelmsRoland HemmingerWalter Wolf
    • B21D39/08B21D39/20B21D53/08F28F1/32B23P15/26
    • F28F1/32B21D39/08B21D39/20B21D53/085F28F2275/125Y10T29/49375Y10T29/53122
    • A method and a device for the draw expansion of metal tubes of oval cross-section uses expansion elements drawn unidirectionally through metal tubes by means of draw elements. The expansion elements are fastened to the draw elements by suspension devices which have a hammer-like contour. The draw elements are preferably made of a rod-shaped material. An apparatus of the invention is an apparatus for mechanically expanding metallic tubes, in particular tubes in heat exchangers. Each individual tube to be expanded is held in at least one holding device and passed through by a drawing mandrel with an expanding element. To prevent jamming of the expanding element in one of the holding devices, the holding devices are provided with lateral guides which are resiliently compliant outward in the radial direction. When the expanding element passes through the metallic tube, the tube is expanded in the radial direction. The forces occurring thereby in the axial direction are absorbed by the holding device, since the tube is seated on a stop in the holding device.
    • 椭圆形横截面的金属管的拉伸膨胀的方法和装置使用通过拉伸元件单向拉伸通过金属管的膨胀元件。 膨胀元件通过具有锤状轮廓的悬挂装置固定到牵引元件。 牵引元件优选地由杆状材料制成。 本发明的装置是用于机械地膨胀金属管,特别是热交换器中的管的装置。 要扩展的每个单独的管被保持在至少一个保持装置中并且通过具有扩张元件的拉拔心轴通过。 为了防止在其中一个保持装置中的膨胀元件的卡住,保持装置设置有沿径向向外弹性地顺从的横向引导件。 当膨胀元件通过金属管时,管沿径向膨胀。 因此,由于保持装置中的止动件就位于保持装置中,所以轴向产生的力被保持装置吸收。