Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1992-11-19
1994-04-26
Dean, Richard O.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
72 13, 723425, 723426, 7234294, 72364, 148511, 148689, 266 80, 266 87, 266259, C22F 104, C21D 1100
Patent
active
053063651
ABSTRACT:
Apparatus and process are disclosed for providing, and continuously monitoring and controlling, a tapered temperature profile in solid metal first heated to a specified initial temperature. Temperatures are monitored at a plurality of locations along the length of the metal and are adjusted by successively withdrawing and returning a portion to a heating source through physical movement
In one aspect, apparatus and process continuously monitor and control a tapered temperature profile in a billet of aluminum alloy through a first step of rapid heating in a single-zone electric induction furnace to a temperature sufficient to bring the billet to its cold end set point while not exceeding its maximum skin temperature. The temperatures of the billet are monitored at its die end and its ram end and are adjusted by successively withdrawing and returning the billet to the induction furnace to reduce the heat in the ram end relative to the die end. A specified tapered temperature profile can be established and maintained along the billet to match a desired temperature profile reference value. In one aspect, the tapered temperature profile preferably produces a traveling crush or upset for reducing air entrapment in the billet to be extruded.
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Aluminum Company of America
Dean Richard O.
Glantz Douglas G.
Koehler Robert R.
Pearce-Smith David W.
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