| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a draw-type tube expansion unit capable of downsizing a device.SOLUTION: A unit of this invention for expanding a diameter of a tube, comprises: a weight; a tube expansion billet having an open hole on a center axis of the tube to be expanded and disposed on the axis; and a drawing member connected to the weight via the open hole. The tube expansion billet features expansion of its outside diameter, which is implemented by a cam mechanism as the weight comes closer. This configuration using the cam mechanism to pull the drawing member to raise the weight to expand the outside diameter of the tube expansion billet, enables the draw-type tube expansion.</p> |
