JPH01178344A - Apparatus for producing semi-solidified metal slurry - Google Patents

Abstract

PURPOSE:To improve yield and producing efficiency by forming horizontal cross sectional shape in hollow part of vessel part in a producing apparatus to round shape, widening both sides thereof to horizontal direction from upper part toward lower part and constituting the lower end outlet to a flat rectangular shape. CONSTITUTION:The horizontal cross sectional shape in the hollow part of the vessel 10 is formed to the round shape and both sides thereof are widened to the horizontal direction from the upper part toward the lower part and the lower end outlet 12 is constituted to the flat rectangular shape. Semi- solidified metal slurry flowed down from the outlet 12 is uniformly supplied into pouring basin part in twin roll type continuous casting machine as rectangular shape. By this method, the yield and the producing efficiency are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for producing semi-solid metal slurry.

[Prior Art] As a method for obtaining a semi-solid metal slurry in which as many fine spherical crystal grains as possible are present in the molten metal in a solid-liquid coexistence temperature range in a metal alloy containing two or more metal elements, the molten metal is While controlling the temperature, applying stirring shear force to the
There is a method of crushing the growing dendrite crystal structure to uniformly mix fine spherical crystal grains in molten metal, and various methods have been proposed as means for realizing this method.

Therefore, as a conventional semi-solid metal slurry manufacturing device,
For example, there is a device as shown in Japanese Patent Publication No. 56-20944. In this device, the temperature of the molten metal is controlled by a cooling device and a heating device installed on the outer periphery of the container, and the molten metal inside the container is stirred by the rotation of a stirring rod to form a semi-solid metal slurry. The slurry is taken out from an outlet provided at the bottom of the container.

When producing a thin plate from the above-mentioned semi-solid metal slurry, the semi-solid metal slurry taken out from the container is supplied to, for example, a twin-roll continuous casting machine, and is cooled and solidified by a pair of cooling rolls to form a slab. The slab is then pulled out from between the cooling rolls.

[Problems to be Solved by the Invention] However, when using the above-mentioned device to supply semi-solid metal slurry from a container to a twin-roll continuous caster, the outlet provided at the bottom end of the container is circular or polygonal. The discharged semi-solid metal slurry also has a cylindrical shape, and it takes time to spread it uniformly in the sump between the cooling rolls. Therefore, a plate with a predetermined cross-sectional shape cannot be obtained at the start of casting, resulting in a problem of poor production efficiency and yield.

The present invention has been made in view of the above-mentioned circumstances, with the object of making it possible to manufacture a thin plate having a predetermined rectangular cross-sectional shape from the start of casting.

[Means for solving the problems] The present invention provides a rotatable stirrer in a container, and by rotating the stirrer, a stirring shear force can be applied to the molten metal in the container to form a semi-solid slurry. In the semi-solid metal slurry manufacturing apparatus, a container for discharging flat solidified metal slurry is attached to the lower part of the container, and the horizontal cross-sectional shape of the hollow part of the container is circular in the upper part and flat in the lower part. It is.

[Function] The semi-solid metal slurry spreads uniformly within the slurry discharge container and is discharged to the outside with a flat cross-sectional shape.

[Example] Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show an embodiment of the present invention, in which a hollow cylindrical container 3 whose exterior is covered with an iron shell 1 and a fireproof material 2 is provided inside is attached to a casing 4, and the upper side of the container 3 is A molten metal supply pipe 5 for supplying molten metal from the outside into the container 3 is fixed to the section, and between the iron skin 1 and the refractory material 2 of the container 3,
A heat medium supply pipe 6 for circulating a heat medium for heating the molten metal and a cooling medium supply pipe 7 for circulating a cooling medium for cooling the molten metal are provided.

A container 10 for discharging semi-solid metal slurry consisting of an iron skin 8 and a refractory material 9 is attached to the lower part of the container 3, and a heat medium for heating the semi-solid metal slurry is circulated between the iron skin 8 and the refractory material 9. A heat medium supply pipe 11 is disposed, and a twin-roll continuous casting machine having a pair of left and right cooling rolls, for example, is disposed at the bottom of the container 10, although not shown.

The horizontal cross-sectional shape of the hollow part of the container 10 is circular as shown in FIG. 2, and its diameter is smaller than the diameter of the lower end of the hollow part of the container 3. Further, both sides of the container 10 gradually expand horizontally from the top to the bottom, and the horizontal cross-sectional shape of the lower end protruding loe 2 is a flat rectangular shape as shown in FIG. Solidified metal slurry is
It has a rectangular shape so that it can be uniformly supplied to the sump of the twin-roll continuous caster.

Another casing 13 is installed on the upper part of the casing 4, and a vertical shaft 15 that can be rotated by a drive device is fitted and supported by a bearing 14 attached to the casing 13, and a lower end flange portion of the vertical shaft 15 is fitted. A vertical fluid pressure cylinder 16 is disposed in the vertical shaft 15a, and a stirrer 17 made of ceramic, for example, is disposed at the lower end of the vertical shaft 15, and the lower end of the piston rod lea of the fluid pressure cylinder 16 is connected to the upper end flange portion 17a of the vertical shaft 15. A key 18 is interposed between the flange portions L5a and 17a so as to be engaged with the shaft I5 and to enable transmission of power from the vertical shaft I5 to the stirrer 17.

The molten metal stirring section of the stirrer 17 has a polygonal or cylindrical cross section, and a spiral iron piece 19, for example, which generates an induced current as a heating means is embedded inside the molten metal stirring section of the stirrer 17. Ceramic guide member 2 with a smaller diameter and located inside the container 10
0 is integrally fixed to the lower end of the stirrer 17, and a spiral guide groove 20a is carved on the outer periphery of the guide member 20.

In the figure, 21 is a gas exhaust pipe provided in the casing 13, and 22 is a molten metal.

When producing semi-solid metal slurry, the stirrer I7 is lowered by the fluid pressure cylinder 1G to minimize the gap between the lower end of the stirrer 17 and the upper surface of the refractory material 9 of the container 10, and the vertical shaft 15 is driven to lower the stirrer I7. is rotated, the gas in the container 3 is sucked and vented through the pipe 21, the iron piece 19 is energized to generate an induced current, and the heat medium is circulated through the heat medium supply pipe 6.11.

For this reason, the stirrer 17 is caused by an induced current and the container 3.
The wall surfaces of the refractory materials 2 and 9 of 10 are respectively heated to desired temperatures by the heat medium.

When the stirrer 17 and the refractory material 2.9 are heated to a predetermined temperature, the molten metal 22 is introduced into the container 3 from the molten metal supply pipe 5.
, supply the heat medium to the heat medium supply pipe 6 and the cooling medium to the coolant supply pipe 7 as necessary, and further supply the stirrer 17
The heating by the induced current is continued or stopped, and the stirrer 17 applies stirring shear force to the molten metal while controlling the temperature of the molten metal, crushing the growing dendrite crystal structure and creating a uniform fine spherical shape in the molten metal. A semi-solid metal slurry is produced by mixing crystal grains. Since the stirrer 17 and the refractory material 2 are heated to a predetermined temperature even when the supply of molten metal is started, the molten metal is not cooled by the stirrer 17 and the refractory material 2, and therefore the generation of solidified shells can be prevented.

When a predetermined flat solidified metal slurry is formed, the stirrer 17 is raised by the fluid pressure cylinder 16.
A gap of approximately X is formed between the lower end and the upper surface of the refractory material 9 of the container 10, and the semi-solid metal slurry is supplied from the container 3 through the lower end outlet 12 of the container 10 to the sump of the twin roll continuous caster. .

At this time, since the semi-solid metal slurry is guided along the guide groove 2Qa of the rotating guide member 20 and discharged,
The semi-solid metal slurry is smoothly discharged into the container 10. Further, since the semi-solid metal slurry spreads uniformly in the longitudinal direction within the container 10, it is supplied to the twin roll continuous caster in a rectangular shape with a flat cross section. Therefore, a twin-roll continuous casting machine can easily cast a thin plate having a rectangular cross-section.

FIG. 4 shows another example of a container for discharging semi-solid metal slurry used in the present invention, and in this example, the cross-sectional shape of the slurry outlet side of the container [0] is a flat ellipse. Even with such a shape, the semi-solid metal slurry is discharged in a flat state uniformly spread in the longitudinal direction.

In addition, in the embodiment of the present invention, the case where the stirrer is heated by an induced current has been explained, but it is also possible to incorporate a heating medium supply pipe in the stirrer and heat the stirrer with the heating medium. Of course, various changes may be made without departing from the gist of the invention.

[Effects of the Invention] According to the semi-solid metal slurry manufacturing apparatus of the present invention, the semi-solid metal slurry can be discharged with a rectangular cross section, so thin plates with a rectangular cross section can be easily manufactured, improving yield and production efficiency. This has the excellent effect of achieving the following.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the semi-solid metal slurry manufacturing apparatus of the present invention, FIG.
The figure is a view taken along arrows 1--2 in FIG. 1, and FIG. 4 is an explanatory view of another example of a container for discharging semi-solid metal slurry. 3 in the diagram. IO is a container, 12 is a lower end outlet, and 17 is a stirrer.

Claims (1)

[Claims] 1) A semi-solid metal slurry manufacturing apparatus in which a rotatable stirrer is disposed in a container, and by rotating the stirrer, a stirring shear force can be applied to the molten metal in the container to form a semi-solid slurry. 1. A semi-solid metal slurry manufacturing apparatus, characterized in that a container for discharging semi-solid metal slurry is attached to the lower part of the container, and the horizontal cross-sectional shape of the hollow part of the container is circular in the upper part and flat in the lower part.