Metal founding – Process – With measuring – testing – inspecting – or condition determination
Patent
1986-03-24
1987-05-12
Lin, Kuang Y.
Metal founding
Process
With measuring, testing, inspecting, or condition determination
164452, B22D 1122
Patent
active
046641750
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a method for continuous casting of metal, particularly to a method for the gas-pressure impartation type continuous casting of non-ferrous metal.
2. Background Art
The cast lump (hereinafter referred to as ingot) which is a starting material to be used in rolling, extrusion, or other plastic workings, of metal (including alloy) is produced mainly by continuous casting. Particularly for non-ferrous metals, a continuous casting using a perpendicular, fixed mold is generally adopted. This procedure includes the float method, hot-top method, spout method, and other methods with variations in the means for feeding the molten metal. In the float method, a floating distributor is floated on the surface of a melt, to keep the level of the molten metal constant, to uniformly distribute the stream of the melt, etc., and molten metal is fed via the floating distributor from a spout to a perpendicular, fixed mold. In the hot-top method, a melt-receiving reservoir made of heat-insulating refractories is provided on the upper portion of a perpendicular, fixed type open mold, so that the high hydrostatic pressure of the molten metal is maintained at the solidified layer in a metal ingot. In the spout method, the individual floating distributors and spouts are not paired, but, instead, one spout is provided for several floating distributors and the inflow of molten metal therefrom into the perpendicular, fixed type open mold is arrested and released by means of a stopper, so that a desired inflow amount of molten metal is obtained.
For the above-mentioned methods for continuous casting, a recent principal improvement is a gas-pressure impartation method. This is mainly intended to improve the cast skin and the surface layer structure of the ingot. This method uses the gas-pressure impartation in the hot-top continuous casting. For example, according to the inventions disclosed in Japanese Examined Patent Publication Nos. 54-42847, 55-18585, and 55-18586, in the so-called hot-top method wherein a melt-receiving reservoir made of refractory is provided at an upper portion of a cylindrical mold, a method has been proposed wherein the inner lower-end surface of the melt-receiving reservoir projects inside the inner-wall of the mold so that an overhanging portion is formed, molten metal is poured into the mold and the melt-receiving reservoir, and gas is introduced just below the overhanging portion so that a gas pressure is applied to the outer circumferential surface of the molten metal.
In this method, the application of the gas pressure pushes downward the portion at which the circumferential surface of molten metal is in contact with the mold below the compulsorily cooled mold, which shortens the axial contact length between the melt and the mold and thereby, particularly, a cast surface having an excellent smoothness and a thin layer of inverse segregation is considered to be advantageously obtained. In the above-mentioned inventions, the operation conditions to achieve an expected effect are disclosed in terms of the interrelationship among and the ranges of three factors, i.e., the gas flow rate, the lubricant oil flow rate, and the level of the melt in the melt-receiving reservoir. According to the study carried out by the present inventors, it has been observed that the above inventions are most suitable for the continuous casting of medium and small size billets and able to stably produce excellent billets, but it is difficult to obtain an expected effect for the continuous casting of large size billets with a large section, and sheet slabs for rolling use.
The second method is the gas-pressure impartation in a separate chamber of a mold.
That is, as disclosed in U.S. Pat. No. 3,533,462 and Japanese Unexamined Patent Pub. No. 54-132430, a gas-pressure impartation type continuous casting is described, wherein a sleeve is concentrically provided at the upper portion of the inner circumferential surface of a compulsorily cooled mold, a gas pressure is app
REFERENCES:
patent: 4157728 (1979-06-01), Mitamura et al.
patent: 4355679 (1982-10-01), Wilkins
patent: 4420250 (1983-12-01), Kompa
Mitamura Ryota
Yanagimoto Shigeru
Lin Kuang Y.
Showa Aluminum Industries K. K.
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