JPH07100218B2 - Thin plate manufacturing equipment - Google Patents

Description

The present invention relates to a thin plate manufacturing apparatus.

[Prior Art] In a conventional thin plate manufacturing apparatus, a container for supplying molten metal is provided on two rolls which can be internally cooled, and the container is provided with a cooling device and internal cooling that extends in one axial direction such as vertical or horizontal. A possible stirring rod is rotatably provided, the molten metal supplied into the container is cooled to a solid-liquid coexistence temperature range by using a cooling device, and then the stirring rod is rotated to obtain a molten metal cooled to the solid-liquid coexistence temperature range. After forming a highly viscous semi-solidified slurry containing fine crystal grains by applying mechanical agitation, the semi-solidified slurry is cooled between the rolls and drawn out from between the rolls to produce a high-strength, high-quality thin plate. It is the one.

[Problems to be Solved by the Invention] However, in the above-described thin plate manufacturing apparatus, since the stirring rod was arranged only in the uniaxial direction in the vertical direction or the horizontal direction with respect to the container, it was cooled to the solid-liquid coexisting temperature range. The molten metal can only be stirred in one direction in a substantially regular manner, and the molten metal that is not stirred is locally present in the container. The stirring ability is insufficient, and therefore it contains uniform and fine fine grains. A semi-solidified slurry could not be formed, and the strength and quality of the produced thin plate were not always sufficiently good.

In view of the above situation, the present invention improves the stirring ability,
It is an object of the present invention to provide a thin plate manufacturing apparatus capable of manufacturing high strength and high quality thin plates.

[Means for Solving Problems] The present invention relates to a method in which a molten metal having a solid-liquid coexisting temperature is supplied into a container,
In a thin plate manufacturing apparatus in which a plurality of stirring rods that mechanically stir to form a semi-solidified slurry are attached to the container, and a pair of endless moving molds that can be internally cooled downstream of the container are arranged, The agitation rod is made into two or more axes having different axis directions to form a thin plate manufacturing apparatus.

[Operation] Therefore, in the present invention, the biaxial or more stirring rods having different axis directions randomly stir the entire molten metal cooled to the solid-liquid coexisting temperature in the container, and the molten metal is given a large shear deformation. And becomes a semi-solidified slurry containing uniform and fine fine grains,
It is cooled between the rolls and becomes a high quality thin plate.

[Examples] Examples of the present invention will be described below with reference to the drawings.

1 and 2 are explanatory views of an embodiment of the present invention.

A pair of endless moving molds that can be internally cooled, such as rolls
1 and 2 are arranged horizontally, a container 3 surrounded by a barrel seal plate and a side seal plate is provided on the rolls 1 and 2, and a cooling pipe for circulating a cooling medium is provided so as to surround the outside of the container 3. A cooling device 4 is provided.

In addition, a plurality of (three in the figure) agitating rods 5, 6 and 7 which have a polygonal cross section and extend vertically and which can be internally cooled are arranged inside the container 3 along the axial direction of the rolls 1 and 2, and each agitating device is provided. The rods 5, 6, 7 are connected to the driving devices 11, 12, 13 via couplings 8, 9, 10 respectively, and the driving devices 11, 12, 13 are fixed to the mounting member 14.

Furthermore, internally coolable stirring rods 15, 16, 17 having a polygonal cross section and extending horizontally are disposed inside the container 3 so as to be located between the container 3 and the vertical stirring rods 5, 6, 7. Stir bar 15,16,17
Is pierced through the container 3 and connected to driving devices 21, 22, 23 outside the container 3 via couplings 18, 19, 20 respectively, and the respective driving devices 21, 22, 23 are fixed to the mounting member 24.

In addition, 25 is a molten metal, 26 is a solidified shell, 27 is a thin plate, 28 is a tundish, 29 is a fine crystal grain, 30 is a semi-solidified slurry, and 31 is a seal.

When manufacturing the thin plate 27, the molten metal 25 is supplied from the tundish 28 to the container 3, and the stirring devices 5, 6, 7 and 15, 16, 17 are internally cooled while driving devices 11, 12, 13 and 21. , 22,23 rotate the stirring rods 5,7 and 15,17 so that the peripheral speed is high and the stirring rods 6 and 16 rotate at a low peripheral speed (the stirring rods 5,6,7 and 15,16,17 The above peripheral speed may be obtained by changing the cross-sectional area), and a cooling medium is supplied to the cooling pipe of the cooling device 4 to gradually cool the inside of the container 3 to a temperature range in which the molten metal 25 coexists with solid liquid. In this way, while the rolls 1 and 2 are internally cooled, the parts facing each other are rotated downward.

Then, the molten metal 25 is gradually cooled to the solid-liquid coexisting temperature range in the container 3 and becomes a dendrite form having a substantially regular skeleton structure of solid crystals, and further, the stirring rods 5, 6, 7 and 15, 16, 17
Mechanically agitated to destroy the dendrite morphology and become a semi-solidified slurry 30 containing fine crystal grains 29 capable of uniform deformation and having high viscosity and surface tension.
Supplied between 1 and 2. The semi-solidified slurry 30 supplied between the rolls 1 and 2 is cooled by the rolls 1 and 2 to form a solidified shell 26 on the surfaces of the rolls 1 and 2, and the semi-solidified slurry 30 having the semi-solidified shell 26 formed on the surface is a roll. It is pulled out from between rolls 1 and 2 by the rotation of rolls 1 and 2, and thereafter the solidified shell 26 grows evenly, and it also solidifies from the inside centering on the fine crystal grains 29, and is a thin plate 27 of high strength and homogeneity. Becomes

As described above, it has been confirmed that when the thin plate 27 is manufactured by making the molten metal 25 into the semi-solidified slurry 30, the thin plate 27 having high strength can be obtained.

At this time, the thin plate manufacturing apparatus has two axes in which the axes of the vertical stirring rods 5, 6, 7 and the horizontal stirring rods 15, 16, 17 are orthogonal to each other, so that the stirring ability for the molten metal 25 is dramatically improved. , Molten metal 25
The whole is stirred irregularly in the container 3. Therefore, the molten metal
A large shear deformation can be uniformly applied to 25, a semi-solidified slurry 21 containing uniform and fine fine crystal grains 20 is formed, and a thin plate 27 of high strength and high quality is manufactured.

The present invention is not limited to the above-mentioned embodiment,
An endless block mold and a moving mold composed of steel belts may be used instead of rolls, the stirring rod may be rotated in any direction and at any speed, and the stirring rod may be provided on three or more axes. Needless to say, various changes can be made without departing from the scope of the present invention.

[Effects of the Invention] As described above, according to the thin plate manufacturing apparatus of the present invention, since the stirring bars are two or more shafts having different axial directions, the stirring ability for melting and the like is dramatically improved, and the molten metal is evenly large. Shearing can be applied, a semi-solidified slurry containing uniform and fine fine crystal grains is formed, and excellent effects such as the production of a thin plate of high strength and high quality can be achieved.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention, and FIG. 2 is a view of FIG.
It is a II-II arrow line view. In the figure, 1 and 2 are rolls, 3 is a container, 4 is a cooling device, 5, 6, 7, 15 and
16, 17 are stirring rods, 11, 12, 13, 21, 22, 23 are driving devices, 25 is a molten metal, 26 is a solidified shell, 27 is a thin plate, 29 is a fine crystal grain, and 30 is a semi-solidified slurry.

Claims (1)

[Claims] 1. A plurality of stirring rods for mechanically stirring a molten metal having a solid-liquid coexisting temperature supplied into a container to form a semi-solidified slurry, can be internally cooled downstream of the container. In the thin plate manufacturing apparatus in which a pair of endless moving molds is arranged as described above, the thin plate manufacturing apparatus is characterized in that the stirring rods are two or more axes having different axial directions.