Metal deforming – By extruding through orifice
Patent
1976-12-30
1982-01-05
Larson, Lowell A.
Metal deforming
By extruding through orifice
72270, 72271, 72272, 722735, 72273, 72364, 29446, B21C 2321, B21C 2902, B21C 3506, B21C 2600
Patent
active
043087426
ABSTRACT:
Metal billets to be used for extrusion are cast and quickly cooled to their solidifying temperature to minimize grain growth and are delivered to a tempering oven where they cool to the temperature required for extrusion, thus also evening the temperature of the billet. They are kept at that temperature until taken to an extrusion press one at a time where the billet is maintained against cooling from its extrusion temperature throughout the extrusion time. The billet is of such size and shape that the time between the first solidification of the outer surface and the last solidification of the inner liquid metal thereof is not so great as to cause excessive grain structure. In the extruding machine, the tie rods that resist the extruding pressure are prestressed to prevent appreciable dimensional variations in the press due to normal variations in the extruding pressure. The junction between the bottom of each bar and the last fragment of metal of the billet from which it was extruded is made frangible to facilitate breaking away of that last fragment. The extrusion from each successive billet forces the previously extruded bar from the press.
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The Extrusion of Metals by Pearson and Parkins, 2nd Ed. (1960) pp. 157-159, 182-185, 187-195, 243-255, 284-289.
Harrison Nelson K.
Lamb Dana B.
Larson Lowell A.
Spector Morris
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