JPS63303659A - Method and apparatus for rolling molten metal - Google Patents

Abstract

PURPOSE:To facilitate adjustment of crater end position, to present breakout and to safely execute rolling of molten metal by supporting the molten metal on an endless belt on a caterpillar, which shifts at the equal speed with rool, into gap between one pair of upper and lower rolls and biting the supplied molten metal in gap between the upper roll and the belt. CONSTITUTION:The endless metal belt 3 and the caterpillar 2 cooled by a cooling device 7 are shifted as passing through the gap between one pair of water cooled upper and lower rolls 1A, 1B at equal speed with the rolls 1A, 1B. The molten metal 8 in a molten metal vessel 4 is supplied into the gap between the upper roll 1A and the belt 3 and this gap is adjusted with adjusting screw means 6. As one side in this gap is plane surface, even in case the solidified crater end shifts a little from the inevitable position just below the upper roil 1A, the breakout is not developed, and adjustment of the gap is facilitated. Therefore, the rolling of the molten metal is safely executed under good condition even to the thin sheet rolling material to be difficult to produce.

Description

[Detailed description of the invention]

[Field of Industrial Application] The present invention relates to an improved method and apparatus for rolling molten metal.

[Conventional technology]

There is a technology called ``molten metal rolling'' that aims to directly manufacture thin plates from molten metal. This consists of supplying molten metal between a pair of rolls that rotate downward in the same direction, rolling the molten metal by trapping it between the rolls, cooling and solidifying it, and continuously sending it out. This technology simplifies the thin plate manufacturing process by omitting the steps of producing slabs and intermediate rolling as mentioned above, and also improves the internal quality by rapidly cooling and assimilating the molten metal. Its significance is being reconsidered recently because it has benefits such as miniaturization and reduced segregation. However, the problem with molten metal rolling, as is well known, is that it is not easy to control and it is difficult to set and maintain operating conditions. In Fig. 5, the deepest part of the molten metal 8 called the "crater end", in other words, the part E where the solidified shells formed in contact with the rolls on both sides join together, and the line connecting the centers of the pair of rolls. If the distance ρ is too large, rolling will not be possible, and if it is negative, breakout, that is, the flow of the molten metal will likely occur, and the thin plate 9 will not be obtained. Therefore, the range of g that allows smooth operation is narrow and can easily be deviated from this range due to turbulence in the lagoon caused by pouring or non-uniform thickness of the solidified shell. [Problems to be Solved by the Invention] The purpose of the present invention is to correct the weaknesses of the above-mentioned molten metal rolling technology, and
To provide a molten metal rolling method that expands the allowable range of the crater end position necessary to continue smooth operations, and that does not cause a breakout even if the crater end moves to the negative side, and to use this method to implement the method. The goal is to provide equipment. [Means for solving the problem] As shown in FIGS. 1 and 2, the molten metal rolling method of the present invention is characterized in that, as shown in FIG. 1 and FIG. The caterpillar 2 and the endless belt 3 stacked on it are moved through the belt, and molten metal 8 is supplied onto the endless belt 3 from a molten metal pool 4 provided behind and in contact with the upper roll 1A, and then transferred to the lower roll 1B. supported caterpillar 2
A thin metal plate 9 is continuously formed by inserting the molten metal 8 into the gap between the endless belt 3 and the upper roll 1A, rolling it, cooling it, and solidifying it. In carrying out this method, the upper roll needs to be cooled. Tracks and endless belts will also often require cooling means. Cooling can be easily performed at a location away from the rolling section. As shown in FIGS. 1 and 2, the molten metal rolling apparatus of the present invention for carrying out the above-mentioned rolling method includes a pair of rolls IA and IB provided vertically facing each other, and a lower roll between the upper and lower rolls. A molten metal container 4 whose bottom is open on the endless belt 3 and a bottom provided in contact with it at the rear of the upper roll 1A of the caterpillar 2 moving supported by the caterpillar 2 and the endless belt 3 above it, and the above-mentioned caterpillar 2 and the endless belt 3. A driving means (not shown) for moving the belt 3 at a constant speed in the same direction as the endless belt 3, and a driving means (not shown) for rotating the upper roll 1A at a constant speed in the same direction as the endless belt 3. Consisting of (no) In FIG. 1, 6 is a screw means for changing the position of the upper roll. 5 is a support roll that supports the caterpillar, and 7 is a cooling means for the caterpillar and the endless belt. The endless belt is a smooth thin plate made of heat-resistant metal, such as heat-resistant stainless steel, but the caterpillar needs to have enough strength to support the endless belt and perform rolling between it and the upper roll. An example of the structure is shown in FIGS. 3 and 4.

[For use]

The molten metal 8 supplied onto the endless belt 3 from the open bottom of the molten metal container 4 is caught between the upper roll 1A and the endless belt 3, rolled, cooled and solidified into a thin plate 9, as shown in the figure. They are picked up by a non-standard pulling device, wound into coils, or cut to length and stacked. The thickness of the thin plate to be the product can be changed by moving the upper roll up or down to adjust the gap between it and the endless belt. The position of the crater end can be appropriately determined by adjusting the temperature of the molten metal supplied to the molten metal pool, the river in which it stagnates, the conditions for keeping it warm, etc. As can be easily understood, even if the distance 9 between the crater end and the roll center line becomes slightly negative, that is, slightly to the left in the figure, both the solidified shell and the molten metal are entirely on the endless belt, so the conventional Unlike the method in which rolling is carried out in the vertical direction, braking of the molten metal is less likely to occur. Therefore, operation can be continued under conditions where 1 does not become too large on the plus side and the rolling becomes impossible. This will be easily understood by comparing FIG. 5, which shows the principle of the prior art, with FIG. 6, which shows the principle of the present invention. In this manner, according to the molten metal rolling technique of the present invention, factors such as irregularities in the thickness of the solidified shell caused by disturbances in the field due to pouring do not have a large effect. Moreover, the thickness of the solidified shell can be controlled by changing the shape of the molten metal pool, for example, by connecting the upper part, which receives hot water as shown in the figure, to this through a relatively narrow passage, making it less susceptible to the effects of pouring. It becomes even easier by dividing it into a lower part and a lower part. The cooling means is also more advanced than the conventional method that relies on cooling only the rolls, and can cool the caterpillar and endless belt at a location away from the rolling section under well-controlled conditions. Operational stability will be even higher. It goes without saying that the structure of the cooling means is simpler in this case than in the case of cooling two rolls. (1) One-sided loaming According to the molten metal rolling method of the present invention, it is possible to directly produce a thin plate with a desired thickness from molten metal within a wide operational stability range. The molten metal rolling apparatus of the present invention has a relatively simple structure and can carry out the above method. The invention is therefore applicable to all metal materials for which it is desired to produce strip-shaped sheets. The advantage of the molten metal rolling technology described above, which is the refinement of the structure due to rapid cooling, is particularly significant when dealing with materials that involve precipitation of carbides, for example, and it is also useful when rolling ordinary cast slabs. It is useful for processing materials that break easily and are difficult to make into thin sheets, such as certain magnetic materials.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the configuration of the main parts of the apparatus for explaining the molten metal rolling technology of the present invention. FIG. 2 is a sectional view showing details of the rolling section of the molten metal rolling apparatus shown in FIG. 1. FIG. 3 and 4 show an example of the structure of the caterpillar, with FIG. 3 being a plan view and FIG. 4 being a side view. FIG. 5 is a conceptual diagram for explaining the principle of conventional molten metal rolling technology and its problems. FIG. 6 is a conceptual diagram corresponding to FIG. 5 for explaining the principle of the molten metal rolling technology of the present invention and its advantages. 1A...Top roll 1B...Bottom roll 2.
... Caterpillar 3 ... Endless belt 4 ...
Molten metal container 5...Support roll 6...
Upper roll adjustment screw means 7... Cooling means 8... Molten metal 9... Thin plate Patent applicant Daido Steel Co., Ltd. Representative Patent attorney Souo Suga Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) A caterpillar and an endless belt stacked on it are moved between a pair of rolls arranged vertically opposite each other, and metal is poured onto this endless belt from a molten metal pool provided behind the upper roll and in contact with it. Molten metal is supplied and rolled into a gap between an endless belt on a caterpillar supported by a lower roll and an upper roll, and then cooled and solidified to continuously form a metal band. Rolling method. (2) A pair of rolls arranged vertically opposite each other, a caterpillar that moves between the upper and lower rolls while being supported by the lower roll, and an endless belt above the caterpillar, and an endless belt with a bottom attached to the rear of the upper roll and in contact with it. A molten metal container with an open top;
and a molten metal rolling apparatus comprising a drive means for moving the above-mentioned caterpillar and the endless belt at a constant speed in the same direction, and a drive means for rotating the above-mentioned upper roll at a constant speed in the same direction as the endless belt.