Patent ID: 7121320
Filing Date: 2006-10-17
Classification: B22D,C22C,Y10S

Abstract:
1. A method of shaping a semisolid metal comprising: pouring a molten aluminum alloy or a molten magnesium alloy which contains a crystal grain refiner and which is superheated to less than 50° C. above a liquidus temperature of aluminum or magnesium, respectively, directly into a holding vessel without using a cooling jig, maintaining said alloy in the holding vessel for a period from 30 seconds to 30 minutes as a resultant melt is cooled to a molding temperature where a specified liquid fraction is established such that a temperature of the poured alloy which is liquid and superheated to less than 10° C. above the liquidus temperature or which is partially solid, partially liquid and at a temperature of less than 5° C. below the liquidus temperature is permitted to decrease from an initial level and passes through a temperature zone 5° C. below the liquidus temperature within at least 10 minutes, whereby fine primary crystals are generated in said alloy, recovering said alloy from the holding vessel, supplying said alloy into a forming mold, and shaping said alloy under pressure.