2, the casting temperature is too low, will cause the meniscus surface curing area is expanding, prompting the surface of ingot casting cold-lap formation and increase its depth;And is likely to lead to crystallization volume order, make the ingot casting organization produces significant heterogeneity, reduce the mechanical properties of ingot casting.Precision casting temperature falls, the width of the liquid-solid transition, the melt viscosity increases, the metal solidification exhaust and feeding conditions deteriorate, shrinkage, the oxide film and slag waste increase.In the production of 10 mm diameter aluminum rod, while the casting speed, when the casting temperature is too low, under the surface of aluminum rod is still vulnerable to cold insulation phenomenon, even cause the solidification front in asbestos board, diversion mouths motionless or aluminum rod is pulled.3, hexing precision casting temperature, usually refers to let stand of metal melt in the furnace temperature, usually higher than alloy the liquidus temperature of 50 ~ 110 ℃.For a crystal formation of intermetallic compounds tend to be larger alloy, casting temperature should be appropriate.For crack tendency of alloy, such as type LC4 alloy flat ingot casting, casting temperature can be reduced appropriately.For industrial pure aluminum, casting temperature is controlled in the range of 690 ~ 710 ℃, the summer take its undervalued, take its high value in winter.
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