Metal deforming – By use of tool acting during relative rotation between tool... – With metal deformation of different type
Patent
1998-01-28
1999-03-23
Jones, David
Metal deforming
By use of tool acting during relative rotation between tool...
With metal deformation of different type
294211, 72 62, B21D 3908
Patent
active
058845160
ABSTRACT:
In the method and the apparatus for shaping a hollow article without rough edges, a die protecting member, an inner die, a polyurethane strip, two half die cavities and a freezing medium together form the apparatus; wherein, the inner die having a shape to be given to the article to be forged and having a seamless die cavity is hung in the die protecting member; when in processing, the freezing medium is filled in the die protecting member, so that the inner die is embedded in the freezing medium, fast freeze the die protecting member, the seamless die cavity becomes stiff then, then the metallic blank is put in the cavity, and the polyurethane strip is inserted in the blank, then put the dib protecting member in the half die cavities, a forging press exerts a pressure forwardly on the polyurethane strip which creates thereby an expanding force in the blank, so that the blank can have the shape as that of the seamless die cavity, and the process for shaping the hollow article without rough edges is completed, a metallic pipe workpiece thus can be forged by a cold forging process to get an artistic shape.
REFERENCES:
patent: 2827007 (1958-03-01), Wurzburger
patent: 4580427 (1986-04-01), Akamatsu
patent: 4879890 (1989-11-01), Hardwick
patent: 5813266 (1998-09-01), Ash
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