Metal deforming – By extruding through orifice – Utilizing internal forming means
Patent
1977-04-13
1980-04-15
Keenan, Michael J.
Metal deforming
By extruding through orifice
Utilizing internal forming means
72 28, 72271, 72272, 72345, 72462, B21C 2308, B21C 2700, B21C 2504, B21C 3100
Patent
active
041977572
ABSTRACT:
A method and apparatus for the cold forming of a metal billet into a desired geometrical configuration including the steps of feeding the billet into a die cavity while the cavity is open, closing one end of the die cavity with the billet confined therein and disposing an anvil in the opposite end of the die cavity to define an annular space between the anvil and the die cavity wall, closing such annular space, applying a first pressure against a selected area of the billet sufficient to cause the billet to commence extrusion about the anvil and to fill the die cavity, thereafter increasing the volume of the annular space between the anvil and die cavity wall into which the billet is extruded while maintaining a substantially uniform second pressure against the billet in opposition to the flow of the metal, the magnitude of the second pressure being less per unit area than the first pressure whereby the metal flows substantially uniformly in the course of the extrusion. The apparatus of the invention includes a die defining a cavity having opposite open ends, power pad means reciprocatably disposed relative to one end of the cavity in axial alignment with the cavity, anvil means reciprocatably disposed relative to and in axial alignment with the power pad means, ram means reciprocatably disposed relative to and closing the opposite end of the cavity, first power means connected to the anvil means for selecting the position of the anvil means relative to the die cavity, second power means connected to the ram means and supplying a force for reciprocatable movement of the ram means relative to the die cavity, third power means connected to the power pad means and supplying a force to the power pad means for adjusting the position of the power pad means relative to the cavity, and control means selectively activating the aforesaid power means.
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"The Extrusion of Metals", by Pearson and Parkins, 2nd Edition, (1960), pp. 320 and 321.
Gurley D. M.
Keenan Michael J.
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