Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – By stirring or mixing molten metal
Patent
1991-06-28
1992-08-04
Andrews, Melvyn J.
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
By stirring or mixing molten metal
75687, 266901, C22B 916
Patent
active
051352028
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to an apparatus to melt down chips of aluminum, etc. into a molten bath of a melting furnace for aluminum, etc.
2. Background Art
The art to melt down aluminum chips by dipping them into a molten bath of a melting furnace has been developed to make the effective use of chips resulting from machining steps and so on of manufacturing process for aluminum products.
The art is, for example, disclosed in the Japanese Utility Model Laid-Open Nos. 136352/1985 and 136353/1985 in which, chips are charged into a substantially vertical feed pipe having a lower end dipped in a molten bath, and are forced into the molten bath by a screw conveyor mounted in the pipe.
The Japanese Utility Model Laid-Open Nos. 164592/1987 and 22997/1989 disclose the art of dipping chips into a molten bath by conveying a part of molten metal to a higher place through an electromagnetic trough, putting chips in it, and dropping them into the molten bath.
The prior art devices as hereinabove described have, however, the drawback that the apparatus becomes too large since it includes a screw conveyor or an electromagnetic trough. The art which employs the electromagnetic trough furthermore has the drawback that the apparatus becomes expensive.
The art which employs the screw conveyor has also been found to achieve only a low chip melting efficiency, since chips are very likely to float, even if that may once be forced down into the molten bath. The chips become melted, as their temperature is raised by the heat of the molten metal which they contact. The molten metal contacting the chips lowers its temperature, as its heat is taken away by the chips. As hardly any flow occurs to the molten metal contacting the chips, its temperature is eventually lowered to a level in the vicinity of the melting point of the chips. This brings about a reduction in chip melting efficiency. Therefore a large amount of chips are not melted, but float on the surface of the molten bath and undergo oxidation being exposed to the air.
According to the art which employs the electromagnetic trough, there is always a fresh supply of molten metal that is contacted with chips. But this method causes a great disturbance to the surface configuration of the molten bath as a whole, and thereby gives rise to the problems as pointed out below. Firstly, a waste of power is unavoidable to raise the potential energy of a part of molten metal. Secondly, that part of molten metal which is conveyed by the trough has an extremely large surface area for its volume. It has so large an area of contact with air as to be easily oxidized and necessarily undergo an unnegligibly great reduction in temperature when it is conveyed. Therefore, this method can achieve only a low chip melting efficiency, as is the case with the method which employs the screw conveyor.
It is, therefore, an object of this invention to achieve an improved chip melting efficiency by ensuring that a fresh supply of molten metal is always furnished for contacting chips without causing any substantial disturbance to the surface configuration of the molten bath as a whole.
DISCLOSURE OF THE INVENTION
This invention has been made to attain its object as hereinabove set forth, and consists in a chip melting apparatus which comprises: a charging vessel adapted for immersion in a bath of molten metal in a melting furnace, having an opening kept above the surface of the bath, an inlet port through which molten metal is allowed to flow from the bath into the charging vessel, and an outlet port located below the surface of the bath; a pump for conveying the molten metal; and a discharge pipe connected to the discharge side of the pump and having an intake port on a sidewall connected to the outlet port of the charging vessel for returning molten metal into the bath through the discharge pipe.
The inlet port of the charging vessel can be provided through its sidewall, and its outlet port through a bottom wall. The charging vessel may comprises a cylinder, or like body of
REFERENCES:
patent: 4052199 (1977-10-01), Mangalick
patent: 4169584 (1979-10-01), Mangalick
patent: 4286985 (1981-09-01), Van Linden et al.
patent: 4572485 (1986-02-01), Engelberg et al.
patent: 4598899 (1986-07-01), Cooper
patent: 4907784 (1990-03-01), Kusaka et al.
Kinoshita Akira
Yamashita Satoshi
Andrews Melvyn J.
Hitachi Metals Ltd.
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