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1. 发明授权

US06779375B1 Method and apparatus for producing tubes and hollow shafts 有权
标题翻译：用于生产管和空心轴的方法和装置
公开(公告)号：US06779375B1
公开(公告)日：2004-08-24
申请号：US10397651
申请日：2003-03-26
申请人： Randall L. Alexoff
发明人： Randall L. Alexoff
IPC分类号： B21C122
CPC分类号： B21C37/16 , B21C1/24 , B21C1/28
摘要： A method and apparatus for producing an end connection by which a tube of variable wall thickness can be formed by being drawn between a die and a mandrel. The end of tubular stock is reduced and its wall thickness increased by being extruded into the space between a reducing die and a mandrel located within the tube, the mandrel having a plug that forms the inner surface of the formed tube as the mandrel and die are retraced from the end. A screw thread is formed on the inner surface of the formed tube and is engaged by a screw thread on a pull pin adapted for attachment to an actuating cylinder that applies a force tending to pull the tube through the die and mandrel.
摘要翻译：一种用于制造端部连接的方法和装置，通过该端部连接可以通过在模具和心轴之间拉伸而形成可变壁厚度的管。管状原料的末端减少，并且其壁厚通过挤压到位于管内的还原模和心轴之间的空间中而增加，心轴具有形成作为心轴和模具的成形管的内表面的塞子从最后回溯。在成形管的内表面上形成螺纹，并且通过螺纹接合在适于附接到致动缸的拉销上，该螺纹施加倾向于将管拉出模具和心轴的力。

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