Process for producing thin sheet by continuous casting in twin-r

Details Process for producing thin sheet by continuous casting in twin-r Process for producing thin sheet by continuous casting in twin-r

1993-08-18

1995-08-08

Lin, Kuang Y.

Metal founding

Process

Shaping liquid metal against a forming surface

164480, 164428, 164503, B22D 2702, B22D 1106

Patent

active

054390460

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a technique for continuously casting a thin cast strip, having a sheet thickness close to the thickness of a final product, by the so-called "synchronous continuous casting process", that produces no difference in the relative velocity between the cast strip and an inner wall of a mold. The present invention especially relates to such a technique used in a twin-roll continuous casting process, and particularly to a technique for preventing molten metal from leaking out from a pouring basin formed between the upper portion of two rolls.


BACKGROUND ART

In recent years, in the field of continuous casting of metals, various proposals have been made regarding a technique, for casting a thin cast strip having a thickness (2 to 10 mm) close to the thickness of a final product produced by a continuous casting apparatus, using cooling rolls provided with cooling mechanisms inside thereof so as to reduce the production costs, create novel materials, etc.
In the above-described casting technique, the so-called "twin-roll continuous casting process", already known in the art, comprises placing a pair of cooling rolls, rotatable respectively in opposite directions, so as to face each other in parallel while providing a suitable gap therebetween, pressing two side gates against both end faces of the cooling rolls to form a pouring basin for a molten metal above the gap, and continuously casting a thin sheet through the gap, while cooling the molten metal in the pouring basin and rotating the outer periphery of the cooling rolls.
Japanese Unexamined Patent Publication (Kokai) Nos. 60-166149, 63-180348 and 63-183750 and the like disclose a variable width strip casting technique (the twin-roll system) in which casting is effected with the width of a cast strip being arbitrarily varied. Specifically, in a continuous casting machine described in Japanese Unexamined Patent Publication (Kokai) NO. 60-166149, a rotary cooling drum is shifted in the axial direction thereof, and a shield plate fitted onto the surface of the drum is pressed with a spring against the side face of the other drum to form a pouring basin, thereby allowing the width of the cast strip to be varied. Japanese Unexamined Patent Publication (Kokai) No. 63-180348 discloses a casting method wherein casting is effected while vibrating, in the direction of the circumferential direction of the cooling rolls, a side gate provided in contact with the side face of a first cooling roll shifted towards the axial direction of the cooling roll and the circumferential surface of the other cooling roll. Japanese Unexamined Patent Publication (Kokai) No. 63-183750 discloses a side gate which has a tapered end portion to abut against the circumferential surface of the cooling drum to prevent the molten metal from penetrating into the gap between the cooling drum and the side gate.
However, it is difficult to prevent the molten metal from penetrating into the gap between the end face of the cooling roll and the side weir or the gap between circumferential surface of the cooing roll and the side weir (i.e., penetration of molten metal) even by mechanical pressing of the side weir against the cooling roll in one direction or application of vibration to the side weir as in the above-described techniques, which cause the molten metal to penetrate into the above-described gap to form a cast fin on the cast strip. This fin unfavorably shaves the refractory material of the side gate, which causes leakage of the molten metal.
In order to prevent the leakage of the molten metal, Japanese Unexamined Patent Publication (Kokai) No. 62-104653 discloses a technique where an electrode slides on the surface (circumferential surface) of energizable cooling rolls in a twin-roll system to feed DC (direct current) to a molten metal present in the gap between the cooling rolls. Also a DC magnetic flux acts on the molten metal in a direction normal and opposite to the direction of the above-described DC current by means of a DC magnetic flux g

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