Casting method and device for ingot metal

Abstract

The invention relates to a casting method and a device for ingot metal such as aluminum, silver, zinc and zinc-based alloy ingot. The invention adopts the method that the molten metal is cast into an ingot mold at first, then at least one surface of the ingot is heated and insulated during the solidification process, to ensure that the cooling speed thereof is greatly reduced and less than that of the other surfaces of the ingot, and the heating is not stopped until the volume of the molten metal in the center of the ingot during the cold shrinkage process is fully compensated by the molten metal on the surface. The device comprises a casting mechanism and a die, the die adopts a vessel with an opening, an insulating cover for covering the opening is also arranged on the die, and a heating device is arranged in the insulating cover. The invention can be used for ingot metal such as aluminum, silver, zinc ingot, zinc-based alloy ingot and the like cast by the die with the opening. The invention ensures that the volume of the surface can be compensated till the volume everywhere in the ingot metal is completely filled and shrunk through delaying the hardening time of one surface of the ingot metal; therefore, the influencing factors of formation of the internal shrinkage hole are radically eliminated, and the effect of eliminating the internal shrinkage hole is realized.

Description

technical field [0001] The invention relates to a production method and device for metal ingots, in particular to a casting method and device for metal ingots such as aluminum, silver, zinc and zinc-based alloy ingots. Background technique [0002] Aluminum, silver, zinc ingots and zinc alloy ingots are generally produced by melting the metal into a liquid, casting the molten metal liquid into an open mold, and then solidifying it into a solid ingot of the desired shape. The temperature difference in the solidification process is generally more than 300 degrees. During the cooling process, according to the principle of thermal expansion and contraction, the volume of the ingot when the casting is completed must be larger than the volume of the cooled ingot. For small ingots, the thickness of the ingot Not much, the cooling rate of the center of the ingot is not much different from that of the surface of the ingot, and the volume compensation during the cold shrinkage process...

AI Technical Summary

Problems solved by technology

For ingots with an ingot weight greater than 25 kg, if natural cooling or cooling water is used for cooling, the cooling rate at the center of the ingot is quite different from that on the surface of the ingot. When the surface of the ingot has solidified, the ingot There is still a large amount of molten metal in the center, and the volume compensation of this part of molten metal during the cold shrinkage process cannot be transferred to the surface of the ingot, and it is easy to generate internal shrinkage cavities at the thickest part of the ingot and the middle part below the skin. This phenomenon is more serious, and the existence of internal shrinkage cavities may cause water accumulation in the metal ingot, which may cause safety accidents such as explosions during the user's use. It is necessary to improve the casting method and device of the metal ingot to eliminate Shrinkage cavity in metal ingot

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