JPS6137354A - Water cooled drum in drum type continuous casting machine for thin sheet - Google Patents

Abstract

PURPOSE:To produce a thin sheet having a uniform wall thickness and to stabilize the shape of a rolled product by providing preliminarily the hourglass shape corresponding to thermal deformation of water-cooled drums and maintaining the water-cooled drums in a straight cylindrical shape during casting. CONSTITUTION:A pair of the water-cooled drums 1, 1 which are disposed in parallel and are supported to bearings 2, 2 are formed smaller in the outside diameter in the respective central parts than in both end parts and are thus made into the hourglass shape. The outside circumferential surfaces of such drums 1, 1 of which the outside circumferential surfaces are preliminarily formed to the hourglass shaped are heated by a molten steel 4 during casting and are maintained approximately at the straight cylindrical shape by the temp. difference between the inside and outside surfaces. The drums 1, 1 maintaining approximately the straight cylindrical outside circumferential surfaces during casting cool and solidify continuously the molten steel 4 stored in side dams 3, 3 thereby casting continuously the thin sheet 5 having the uniform wall thickness.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of the Invention] The present invention relates to an improvement of a water-cooled drum in a drum-type continuous sheet casting machine.

[Conventional continuous casting machine]

As shown in Fig. 2 (longitudinal sectional view of the casting machine) and Fig. 3 (plan view of the casting machine), the conventional continuous casting machine has bearings 2,
A thin plate 5 is cast by cooling molten steel 4 between a pair of water-cooled drums 1 and 1 supported by a steel drum 2. The water-cooled drums 1, 1 in this conventional casting machine have a right cylindrical shape at room temperature.

[Disadvantages of the conventional casting machine mentioned above]

By the way, the cross-sectional shape of the thin plate 5 is required to be rectangular or slightly thick in the center, but in conventional casting machines,
When casting the thin plate 5, the outer peripheral surface of the water-cooled drums 1, 1 is
Due to heating expansion due to contact with the molten steel 4 on the outer surface and cooling contraction due to the cooling water on the inner surface, the central portion swells and deforms into a beer barrel shape, so the central portion of the thin plate 5 is not thin and the plate thickness accuracy decreases. . For this reason, there is a drawback that many rolling stands are required when rolling is performed in a subsequent process.

[Object of the present invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a water-cooled drum for a drum-type thin plate continuous casting machine that can eliminate the above-mentioned problems and can cast a thin plate without making the center part of the thin plate thin.

[Configuration of the present invention]

The present invention uses an hourglass-shaped water-cooled drum as a means for achieving the above object. That is, the present invention is a drum type continuous sheet casting machine that continuously supplies molten steel between a pair of parallel water-cooled drums, solidifies it into a plate shape, and continuously casts a thin plate. This water-cooled drum is characterized by being given an hourglass shape corresponding to deformation and having a right cylindrical shape during casting.

Hereinafter, the present invention will be explained in detail based on FIG.

FIG. 1 is a plan view of a drum type continuous thin plate casting machine which is an embodiment of the present invention. In FIG. 1, a pair of water-cooled drums 1.1 supported by bearings 2, 2 are arranged in parallel, each having an outer diameter smaller at the center than at both ends.
It is drum-shaped. The outer circumferential surfaces of the water-cooled drums 1, 1 whose outer circumferential surfaces have been shaped like drums are heated by the molten steel 4 during casting.
Due to the temperature difference between the inner and outer surfaces, the outer peripheral surface becomes approximately right cylindrical.

In this way, the water-cooled drum 1.1, whose outer circumferential surface has become almost right cylindrical during casting, continuously cools and solidifies the molten steel 4 stored in the side dams 3, 3, and forms a thin plate 5 with a uniform wall thickness. is continuously cast. At this time, the distance between the pair of water-cooled drums 1 and 10 is adjusted to determine the thickness of the thin plate 5- to be cast.

[Effects of the present invention]

As described in detail above, the present invention uses a drum-shaped water-cooled drum, and during casting, the outer peripheral surface of the water-cooled drum becomes approximately a right cylinder. This produces the effect that thin plates can be manufactured. Therefore, in the next rolling process, the shape of the rolled product is stabilized, leading to improved quality), and rolling control becomes easier. Furthermore, in the present invention,
Since a thin plate with uniform wall thickness is obtained, there is no need for rolling to make the plate thickness uniform, and only rolling for sizing (thickness adjustment) is required, which also has the effect of reducing the number of rolling stands. be.

[Brief explanation of drawings]

FIG. 1 is a plan view of a drum-type continuous thin plate casting machine that is an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of a conventional continuous casting machine, and FIG. 3 is a horizontal view of the same casting machine. 1.1...Water cooling drum 2.2...Bearing 3.3...Side dam 4... Molten steel 5・・・・・・・・・・Thin sheet agent 1) Meifuku agent Ryo Hagiwara −

Claims (1)

[Claims] In a drum-type thin plate continuous casting machine that continuously supplies molten steel between a pair of water-cooled drums parallel to each other, solidifies it into a plate shape, and continuously casts a thin plate, the water-cooled drum is pre-shaped in an hourglass shape corresponding to thermal deformation. A water-cooled drum characterized in that it has a right cylindrical shape during casting.