JPH01192446A - Apparatus for continuously producing semi-solidified metal - Google Patents

Abstract

PURPOSE:To continuously obtain a semi-solidified metal having the desired solid phase ratio by continuously arranging electro-magnetic device and heating mechanism and cooling mechanism for controlling temp. and controlling heat input and heat output quantities. CONSTITUTION:Molten steel 1 is poured into a tundish (T/D) 3 from a ladle 2 and supplied into a sprue 4 of rheomaker from the T/D 3. This molten steel is slowly shifted in the mold 5 toward lower end exhaust hole 10. In the outer peripheral part of the mold 5, the electromagnetic stirrer 6, heating device 7 and cooling device 8 are continuously arranged. The discharged semi-solidified metal is rolled with twin rolls 11 to produce a strip 12. Further, based on molten iron temp. detected with a temp. measuring element 15 inserted in the molten metal at discharging hole side, by controlling set number of working the heating device 7 and the cooling devices 8, the device to be worked and the heating and cooling rates with temp. control device 16, the desired molten iron temp. and the solid phase ratio can be obtd.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention provides a continuous production device for continuously supplying a solid-liquid coexistence material, that is, a semi-solid metal, which is homogeneous and has a desired solid phase ratio. It was done in order to

<Prior Art> When casting molten metal, electromagnetic stirring has been conventionally used to increase the equiaxed crystallinity in order to improve the quality of the molten metal. Unexamined Japanese Patent Application Publication No. 61-52
There is a method of continuous casting in which electromagnetic stirring is carried out continuously from the molten part to the solidified part, as shown in Japanese Patent No. 971 "Continuous Casting Method". In addition, as shown in Japanese Patent Application Laid-open No. 59-42159 (Japanese Patent Publication No. 61-43146), electromagnetic stirring is applied to horizontal continuous casting to form metal into a semi-solid slurry (solid-liquid coexistence material).
There are methods such as molding and casting.

However, the former is continuously 1! in the continuous casting machine itself! ! This method uses a stirring device to improve the quality of continuously cast material, and is not a method for supplying semi-solid metal as a material for processing. The latter uses a heat exchanger to extract heat from the molten metal, generates a slurry with the desired solid fraction under the action of electromagnetic stirring, and continuously sends it to the mold. This method is limited to improving the quality of continuously cast materials, and is not a method for supplying semi-solid metal.

Under these circumstances, there is a need for an apparatus that can produce a semi-solid metal, that is, a solid-liquid coexistence product, at a desired solid phase ratio and continuously discharge it.

<Problems to be Solved by the Invention> The present invention has been made in view of the above-mentioned circumstances in order to provide a manufacturing apparatus that can continuously supply semi-solid metal having a desired solid phase ratio. It is.

<Means for Solving the Problems> As a result of intensive research into methods for adjusting the solid phase ratio of molten metal, the present inventors have discovered that an electromagnetic stirring device is continuously placed around the outer periphery of a container that stores molten metal. Moreover, by arranging a heating device and a cooling device for temperature control in succession and controlling the amount of heat input and heat removed, the solid fraction f at the time of discharge can be kept within ±20% of the target value (f*=0 The present inventors have found that it is possible to achieve a target value of 0.5 (within ±0.1), and based on this knowledge, the present invention has been accomplished.

The present invention provides (1) a continuous manufacturing apparatus for semi-solid metal that supplies molten metal from a supply port and discharges semi-solid metal from a discharge port; It is a semi-solid metal continuous manufacturing equipment that is characterized by having a heating device for heating the molten metal, a cooling device for cooling it, and an electromagnetic stirring device for stirring it. 2. The apparatus for continuous production of semi-solid metal according to item 0, further comprising (1) a temperature measuring element inserted into the semi-solid metal through the container wall or attached within the container wall. The apparatus for continuously producing a semi-solid metal according to item 0 or item 0, further comprising a control device that controls the metal temperature to an appropriate value based on a signal value obtained from a temperature measuring element.

Function> In the present invention, an electromagnetic stirring device is continuously arranged, and
By arranging a heating mechanism and a cooling mechanism in series for temperature control and controlling the amount of heat input and heat extraction, the solid phase ratio at the outlet of the manufacturing machine can be adjusted as desired. There are two ways to measure the temperature: one is to directly contact the molten metal, and the other is to install it inside the container wall and estimate the amount of heat removed based on the indirect temperature data. Either way, the solid fraction can be controlled to the desired solid fraction. can do.

On the other hand, in order to smoothly discharge the semi-solid metal, that is, the solid-liquid coexistence material, from the discharge port side, the device is tilted and static pressure is applied thereto, as if the toothpaste were being pushed out of the tube. Furthermore, if the solid phase ratio is high and discharge is difficult, a screw mechanism is attached to the lower end of the container to draw in the semi-solid metal and facilitate discharge.

The apparatus according to the present invention will be explained with reference to FIG.

ml of the melt is injected from the ladle 2 into a tundish (hereinafter abbreviated as T/D) 3 and supplied from the T/D to the pouring spout 4 of the rheomaker. This molten steel gradually moves inside the mold 5 toward the lower end discharge port 10.The outer periphery of the mold has an electromagnetic stirring starshield 6. Heating device7. Cooling devices 8 are arranged in series. The shape of the outlet side is free; rectangular can be used for thin plates (or circular for round bars).

This discharged semi-solid metal is formed and rolled by twin rolls 11, for example, to produce a thin plate 12.

In order to discharge the semi-solid metal more smoothly, a screw mechanism 13 is provided at the bottom of the rheomaker as shown in the figure, and this is rotated by a rotary drive device such as a motor 14, thereby achieving the objective. can.

<Example> C: 3.0 TiLN% (hereinafter abbreviated as %), Si: 0.01%, Mn:
0.02% hot metal was melted and passed through a rheomaker while being injected into the T/D. The temperature of hot metal at the mold entrance is 13
00''C, and the temperature on the discharge port side was 1200°C.The solid phase ratio of the hot metal at the discharge port was approximately 40%, and hot metal with uniform composition was discharged.

At this time, five 300kW electromagnetic stirring devices were placed in series, and five 50kHz high-frequency heating devices were placed as heating devices.
The temperature was controlled by passing cooling ring water through the piping.

Mold inner diameter = 200φ, hot metal passing speed: 2m/min1
The length of the aircraft was 5 m, and the production efficiency was 20 t/hr.

Furthermore, even with the same hot metal, the apparatus according to the present invention can supply hot metal with various solid fractions as shown in Table 1 by controlling the operating conditions such as the combination of the heating device and the cooling device and the heating intensity. Ta.

Table 1 also shows the temperature measuring element 15 inserted into the molten metal on the outlet side.
Temperature control device 1 based on the hot metal temperature detected by
6, it is possible to obtain a desired hot metal temperature and solid phase ratio by controlling the number of operating heating devices and cooling devices, the devices to be operated, and their heating and cooling degrees.

When operating the screw mechanism, the solid phase rate is approximately 20
Although the discharge speed was increased, continuous operation was possible.

<Effects of the Invention> When the apparatus according to the present invention is used, as described above, a homogeneous semi-solid metal having a desired solid phase ratio can be continuously supplied as a material for processing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an apparatus and a schematic diagram of control for explaining the present invention. 1... Molten steel, 2... Ladle. 3... Tanditetsu, 4... Pouring spout, 5...
- Container (or mold). 6...Magnetic stirring stirrer. 7...Heating device, 8...Cooling device. 9... Semi-solid metal, 10... Discharge port. 11...Twin roll, 12...Thin plate. 13...Screw mechanism, 14...Motor. 15... Temperature measuring element, 16... Temperature control device. Patent applicant: Kawasaki Steel Corporation Figure 1

Claims (1)

[Scope of Claims] 1. In a semi-solid metal continuous production device that supplies molten metal from a supply port and discharges semi-solid metal from a discharge port, a container for storing flowing molten metal is provided with a wall along the entire length of the container. A continuous manufacturing apparatus for semi-solid metal, characterized in that a heating device for heating the molten metal, a cooling device for cooling the molten metal, and an electromagnetic stirring device for stirring the molten metal are respectively provided. 2. The continuous production apparatus for semi-solid metal according to claim 1, wherein a screw feeder is disposed in the container near the discharge port. 3. Control the metal temperature to an appropriate value based on the signal value obtained from the temperature measuring element inserted into the semi-solid metal through the container wall or from the temperature measuring element installed inside the container wall. The continuous production apparatus for semi-solid metal according to claim 1 or 2, further comprising a control device.