Process for direct chill casting of metals
First Claim
1. In a process for direct chill casting of metals in a forced-cooling mold having a lubricating surface on the inner surface thereof comprising the steps of:
- storing a metallic melt in a feed reservoir for the melt, above and adjacent said mold, said feed reservoir having an overhang over the inner wall of said mold;
feeding said melt from said feed reservoir into said mold;
holding a body of said metal within said mold; and
passing a cooling agent through said mold thereby performing the forced cooling of said metal body;
an improvement which comprises the step of;
introducing a gas from directly below said overhang and applying gas pressure on the peripheral surface of said metal body at the part of said metal body directly below said overhang.
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Abstract
A direct chill casting of metals, particularly hot top casting of aluminum and its alloy, is improved by applying a gas pressure to the metals from directly below the overhang of a feed reservoir for receiving a melt to be cast.
The direct chill casting is further improved by supplying a lubricating oil from a slit for conveying the gas to the inner wall of the mold.
By using the process and the apparatus according to the invention, ingots having excellent smooth surfaces and reduced segregation can be reliably produced with a reduction in the amount of the lubricating oil used.
67 Citations
18 Claims
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1. In a process for direct chill casting of metals in a forced-cooling mold having a lubricating surface on the inner surface thereof comprising the steps of:
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storing a metallic melt in a feed reservoir for the melt, above and adjacent said mold, said feed reservoir having an overhang over the inner wall of said mold; feeding said melt from said feed reservoir into said mold; holding a body of said metal within said mold; and passing a cooling agent through said mold thereby performing the forced cooling of said metal body; an improvement which comprises the step of; introducing a gas from directly below said overhang and applying gas pressure on the peripheral surface of said metal body at the part of said metal body directly below said overhang. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification