Metal founding – Means to shape metallic material – Continuous or semicontinuous casting
Patent
1990-03-16
1991-06-25
Batten, Jr., J. Reed
Metal founding
Means to shape metallic material
Continuous or semicontinuous casting
164429, 164463, 164479, B22D 1106
Patent
active
050258516
DESCRIPTION:
BRIEF SUMMARY
The invention relates to means for casting thin tapes of metal or metal oxide.
It is known to cast metal and metal-oxide melts, using casting wheels or on casting tapes. Crystalline or amorphous solidification can be obtained, depending on the alloy and rate of cooling of the melt. Tapes of this kind, having a width of less than 1 mm to 200 mm or more, can be used for a wide variety of purposes in chemistry, electrical engineering, etc. There are practically no limits to the materials, such as metal or metal oxide melts, which can be cast.
The use of casting wheels having a vertical axis of rotation is known from U.S. Pat. No. 4,281,706. A metal supply means is disposed above the wheel disc. The casting nozzle co-operating with the disc is disposed at a defined angle of inclination to the flat, horizontal disc surface or to slightly bevelled edge surfaces of the disc. The angle of incidence of the melt and the ratio of the speed of the glass jet to the speed of the rotating surface of the casting wheel is of special importance in this method of melt-spinning. Tapes made with this casting wheel are spiral and used for helical tape stacks. Straight tapes cannot be cast by this method.
It is also known from WO No. 88/02288 to casting wheels with a horizontal axis of rotation; instead of the melt-spinning process, the melt is drawn by the casting wheel out of a narrowly defined gap between the nozzle member and the casting-wheel surface. The casting nozzles used for this purpose can be provided with supply means from above or below the discharge opening of the casting nozzle. In both methods of supply, the flow to the nozzle has to be diverted in front of the casting nozzle in the melt supply system, which increases the cost of the nozzle and makes the method more subject to breakdown.
The object of the invention is a further improvement in the casting of tapes, with special regard to the method of supply metal to the casting wheel and an improved nozzle construction. According to the invention, this problem is solved by providing a vertically oriented, rotating cooling surface and directing the casting nozzle towards this surface in such a manner that a gap of less than 1 mm exists between the nozzle and the cooling surface.
The solution according to the invention can further improve the casting of tapes. The metal supply to the substantially vertical drum surface of the casting wheel provides new possibilities for designing metal supply systems and casting nozzles. More particularly the melt supply means can be substantially straight and either above or below the metal-discharge opening of the casting wheel. Another result is that the shape and nature of the melt container or of the metal supply means in the melt container can be freely varied. The casting nozzle can also be simplified, owing the co-operation between the drum surface and the casting wheel according to the invention. The result is that the casting process is more economic and more reliable.
The vertical drum surface of the casting wheel can be disposed either on the inside or the outside of a drum. According to an embodiment, the nozzle arrangement and the monitoring of the gap can be simplified if the metal discharge opening is directed towards a substantially cylindrical outer surface of the drum.
When the tapes produced are very narrow, the metal discharge opening of the casting nozzle can be made round or square. advantageously, in order to cast metal tapes having a width many times the thickness, the metal discharge opening of the casting nozzle is a slot and the slot length is disposed substantially parallel to the axis of rotation.
Additional advantages are obtainable if the casting nozzle is tubular and the longitudinal axis thereof is disposed substantially transversely to the direction of motion of the drum surface. Optionally the longitudinal axis of the metal outlet slot can be disposed in the tube surface, parallel to the longitudinal axis thereof.
Tubular refractory parts, more particularly tubes having a round cross-section, ar
REFERENCES:
patent: 989075 (1911-04-01), Staples
patent: 1017943 (1912-02-01), Akin
patent: 1063895 (1913-06-01), Staples
patent: 4281706 (1981-08-01), Liebermann et al.
Abstract of Japanese Patent Publication 59-209459 Published Nov. 28, 1984.
Abstract of Japanese Patent Publication 62-289355 Published Dec. 16, 1987.
Abstract of Japanese Patent Publication 60-83751 Published May 13, 1985.
Batten, Jr. J. Reed
Concast Standard AG
Kontler Peter K.
Lewenstein Tobias
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