JPH01192447A - Method and apparatus for continuously forming metallic slurry for continuous casting - Google Patents

Abstract

PURPOSE:To enable supplying while holding thixotropic property at low cost by supplying metallic slurry to forming process while giving forced fluidity with a supplying apparatus providing screw for carrying the slurry. CONSTITUTION:When the screw 24 is driven with a driving device 22, the metallic slurry, which is partially solidified-state by stirring at solid-liquid coexistent zone in the stirring process, is sent under pressurizing in a soaking furnace 25 to front face of a die 26 while giving the forced fluidity, that is, under stirring-state. Then, the metallic slurry is held to the thixotropic property and supplied to forming process under condition of holding the fluidity. In the forming process, the metallic slurry is pushed out to the forming die 28 by adjusting flexibility with a preheating furnace 27 to execute continuous casting.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method and apparatus for continuously feeding a metal slurry for continuous casting into a molding process.

[Prior art] Conventionally, when a metal slurry for continuous casting, which is partially solidified by stirring in a solid-liquid coexistence region, is continuously fed to a die, etc. in a forming process, the metal slurry is In order to feed the liquid while maintaining it in an optimal state, stirring is performed using an electromagnetic stirring means.

This electromagnetic stirring means is used to make partially solidified metal slurry develop and maintain thixotropic properties (thixotropy) by stirring in a solid-liquid coexistence region. In order to obtain a sufficient effect, a large-capacity device is required, and the efficiency is extremely low due to indirect stirring, which results in high power consumption.
This ultimately increases material manufacturing costs.

[Problem 8 to be solved by the invention] The technical problem of the present invention is to provide a simple and low-cost method for feeding partially solidified metal slurry to a forming process while maintaining the above-mentioned thixotropic properties. It is about providing the means.

[Means for Solving the Problems] In order to solve the above problems, the method for continuously forming a metal slurry according to the present invention provides a metal slurry for continuous casting that is in a partially solidified state by stirring in a solid-liquid coexistence region. The slurry is continuously fed to the molding process while being forced to flow by a feeding device equipped with a slurry transfer screw that is rotationally driven by a drive device, and the slurry is molded.

In addition, in order to achieve the above object, the continuous forming apparatus for metal slurry according to the present invention includes a stirring device that stirs the metal slurry for continuous casting in the solid-liquid coexistence region in a stirring tank, and a drive device that stirs the metal slurry for continuous casting in a guide cylinder. A feeding device comprising a rotationally driven slurry transfer screw, through which metal slurry partially solidified due to stirring in the stirring device is fed through an outlet of the stirring tank, and a feeding device that passes the metal slurry from the feeding device through a die. It is characterized in that it is equipped with a mold to which the mold is fed.

[Function] When the metal slurry for continuous casting, which is partially solidified by stirring in the solid-liquid coexistence zone in the stirring process, is fed to the molding process by a feeding device equipped with a transfer screw, the feeding During this process, forced flow is applied to the metal slurry, so that the metal slurry develops and maintains thixotropic properties, and is fed to the molding process while maintaining fluidity. Therefore, electromagnetic stirring means etc. are used. There's no need.

[Example] Figure 1 shows an example of an apparatus for continuously feeding a metal slurry for continuous casting made of aluminum, copper, nickel, iron, or an alloy thereof from a stirring device to a forming device based on the present invention. It shows.

First, the stirring device shown in the figure is designed to stir metal slurry for continuous casting in a solid-liquid coexistence region to produce metal slurry for continuous casting in a partially solidified state. A water-cooled stirring tank 3 having a water cooling device (not shown) is provided below the pouring port 2, and a stirring member 4 is inserted into the water-cooled stirring tank 3 and rotatably supported by a bearing (not shown).

The stirring member 4 includes a stirring section 6 made of a cylindrical or other polyhedral body with a polygonal cross section (for example, an octagonal shape) that is immersed in the molten metal 5 poured into the stirring tank a, and a shaft that is rotatably supported. part 7, and a sprue 8 which passes through the stirring part 6 and shaft part 7 and has an upper end facing the pouring port 2 of the turn dish 1 and a lower end opening into the molten metal in the stirring tank 3. The shaft portion 7 is configured to be rotatably driven by a rotary motor 10 via a steel belt 11. Note 1
In the figure, 13 indicates a reflecting plate.

In the water-cooled stirring tank 3, the molten metal 5 continuously poured from the pouring port 2 of the terundish 1 is received by the channel 8 of the stirring member 4, passes through the shaft part 7 and the stirring part 6, and is passed through the shaft part 7 and the stirring part 6. The lower end of channel 8 is injected into the molten metal in the mold. Furthermore, since the stirring member 4 is rotationally driven by the rotary motor 10 at the same time as the molten metal is supplied, the generated dendrite crystals are completely crushed, and then the molten metal is transferred to the feeding device 20 as a metal slurry in a partially solidified state. sent.

In the center of the bottom plate 15 of the water-cooled stirring tank 3 made of refractory material,
A discharge port 1B for discharging molten metal 5 is opened, and a water-cooled stirring tank 3 is opened.
The partially solidified metal slurry that has been stirred inside is transferred to the next stage molding device 2 through the discharge port IB by the feeding device 20! , thereby continuously producing homogeneous slabs without casting defects.

The feeding device 20 drives the metal slurry. Place 22
The slurry is supplied to the molding process by a slurry transfer screw 24 which is rotationally driven within a guide cylinder 23, and its operation is controlled by a drive device 22 for the screw 24.

Further, the guide tube 23 is disposed inside the soaking furnace 25, and around the die 2B attached to the delivery end of the guide tube 23.

A preheating furnace 27 is provided to adjust the flexibility of the metal slurry.

Therefore, when the screw 24 is driven by the drive device 22, the metal slurry, which is in a partially solidified state due to stirring in the solid-liquid coexistence zone in the stirring process, is forced to flow, that is, uniformly in the stirring state. The metal slurry is fed under pressure through the heat furnace 25 to the front surface of the die 26, and as a result, the metal slurry develops and maintains thixotropic properties and is fed to the molding process while maintaining fluidity.

In the forming process, the metal slurry is extruded into the forming IJ 12B with its flexibility adjusted in the preheating furnace 27, and continuous casting is performed. Of course, by arbitrarily changing the hole formation of the die 26, irregularly shaped strips, rods, pipes, etc. with various cross sections can be manufactured.

FIG. 2 shows a different configuration example of a stirring device for metal slurry, in which an induction heating device 31 is provided around the upper part of a stirring tank 30 that continuously supplies hot water, and a cooling device 32 is provided around the lower part of the stirring tank 30. A stirring rod 33 that reaches the cooling zone at the bottom is inserted into the center of the stirring rod 30, and is configured to be rotationally driven by a rotary motor (not shown).

Therefore, in the molten metal continuously supplied to the stirring tank 30, the dendrite crystals are crushed by the rotation of the stirring rod 33 in the stirring tank, and the metal slurry is in a partially solidified state.
It is fed into the guide tube 23 of the feeding device 20 through the lower discharge port 34.

Since the configurations of the feeding device 20 and the molding device 21 are the same as those of the device shown in FIG. 1, the same or equivalent parts will be given the same symbols and the explanation thereof will be omitted.

[Effects of the Invention] As detailed above, in the molding method and apparatus of the present invention, when feeding the metal slurry that is partially solidified due to stirring in the stirring process to the molding process, the metal slurry In order to develop and maintain thixotropic properties, electricity that requires large amounts of power has been used in the past! ! Instead of a stirring device, a mechanical stirring means using a transfer screw of a feeding device is used to transfer the metal slurry at the same time as stirring. Therefore, the metal slurry can be delivered using a simple device at low cost while maintaining its thixotropic properties and fluidity.

[Brief explanation of the drawing]

! Figure s1 is a sectional view showing an embodiment of the continuous forming apparatus according to the present invention, and Figure 2 is a sectional view of another embodiment. 3.30... Stirring tank, I8, 34 - Fist outlet,
20... Feeding device, 22... Drive device. 23-Φ guide tube, 24...Slurry transfer screw, 26...Dice, 28...Mold. Shadow 1 prefecture 2nd exit

Claims (1)

[Claims] 1. Metal slurry for continuous casting, which is partially solidified by stirring in a solid-liquid coexistence zone, is fed by a feeding device equipped with a slurry transfer screw rotationally driven by a driving device, A continuous molding method for a metal slurry for continuous casting, characterized in that it is continuously fed to a molding process and molded while applying forced flow. 2. Equipped with a stirring device that stirs the metal slurry for continuous casting in the solid-liquid coexistence region in a stirring tank, and a slurry transfer screw that is driven to rotate in the guide cylinder by a drive device, partial solidification is achieved by stirring in the stirring device. A continuous casting method comprising: a feeding device into which the metal slurry in a state is fed through an outlet of a stirring tank; and a mold into which the metal slurry is fed from the feeding device through a die. Continuous forming equipment for metal slurry.