B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
205/13
B21C 23/08 (2006.01)
Patent
CA 1132485
METHOD AND APPARATUS FOR THE COLD FORMING OF METAL ABSTRACT OF THE DISCLOSURE 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 the ends of the die cavity with the billet confined therein, and 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 and a second and opposing pressure against the billet sufficient to cause the billet to fill the die cavity, thereafter changing the second pressure acting on said billet to accommodate movement of the metal billet and to maintain a substantially constant force on said billet irrespective of the rate of movement of said billet 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 hydraulic power means connected to the anvil means for selecting the position of the anvil means relative to the die cavity, second hydraulic power means connected to the ram means and supplying a force for reciprocatable movement of the ram means relative to the die cavity, third hydraulic 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 hydraulic power means.
339318
Gowling Lafleur Henderson Llp
Hackett Kenneth P.
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