JPH0357554A - Pouring furnace - Google Patents

Abstract

PURPOSE:To prevent a molten metal from leaking and a pouring gate from being closed by forming the pouring gate on a furnace wall for constituting the bottom face of a furnace body in a pouring attitude after tilting of the furnace body, and providing a sliding nozzle for opening and closing an opening part on this pouring gate. CONSTITUTION:Before tilting of a furnace body 1, a pouring port is closed in advance by a sliding nozzle 7, and the pouring port surrounded by a sand stopper 11 is filled with sand 10 from a sand feeder 9. Subsequently, by a hydraulic cylinder 6A, the furnace body 1 is tilted, a furnace side wall on which the pouring part is provided becomes horizontal and tilting is ended in a position which becomes the bottom face of the furnace, and the furnace body 1 is fixed. Subsequently, the sliding nozzle 7 is moved and by opening the pouring port, the sand 10 is discharged, and pouring is started. When pouring is ended, the furnace body 1 is returned to an upright attitude again, and offered for charging of a molten metal in the next time.

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to a pouring furnace that supplies molten metal to a mold, etc. during casting, and is intended to avoid clogging of the pouring port. .

(Conventional technology) Pouring of molten metal in casting is described in the Iron and Steel Institute of Japan, New Edition Steel Technology Course, Pigmaking and Steelmaking Methods Volume 1 (Chijinshokan) (1
985) P. As shown in No. 265, it is common to open and close the pouring port provided at the bottom of the furnace by moving a sliding nozzle or a stopper rod, and the flow rate is also controlled by opening and closing the pouring port. I'm going. Here, if the pouring port is not sealed reliably, there is a risk that the molten metal will leak, and it is difficult to hold the molten metal in the pouring furnace until the start of pouring and to adjust the amount and temperature of the molten metal.

Furthermore, Japanese Patent Laid-Open Publications No. 56-6775, No. 56-26276, and No. 51-121815 describe techniques for pouring metal by pressurizing the inside of the furnace with gas.

This method reduces the risk of molten metal leaking while holding the molten metal, but there is a high possibility that gas will leak from the furnace body during pouring, and if the gas pressure decreases, the target pouring flow rate cannot be obtained, so it is difficult to rapidly cool and thin the melt. When used for band manufacturing, it is unavoidable that slabs with large deviations in plate thickness are cast. In order to pour molten metal on the order of several tons under pressure, a pouring runner with a diameter smaller than the diameter of the furnace body is required.
The solidification or oxidation of the molten metal within the runner often causes blockage of the runner, making pouring difficult. Furthermore, since pouring by gas pressure is not possible unless there is a certain amount of residual metal, it is impossible to pour all the molten metal in the furnace.

On the other hand, in Japanese Patent Application Laid-open No. 56-6776, the ladle is tilted,
It is disclosed that the molten metal is poured by dropping it, but the falling position of the molten metal changes due to tilting, and it is difficult to finely adjust the flow rate by changing the tilting angle. It is not suitable for casting obi etc.

JP-A No. 60-11.8651 discloses a method in which the molten metal is held below the spout and poured from the spout by tilting the furnace body, but this method simply opens and closes the spout with a plate. Therefore, it is impossible to adjust the flow rate, and there is a risk that the pouring spout may become clogged by a small amount of molten metal flowing into the pouring spout when the furnace body is tilted.

3 (Problems to be Solved by the Invention) This invention proposes a pouring furnace that prevents the pouring spout from being blocked or leaking while holding molten metal, and also allows stable flow rate control during pouring. The purpose is to

(Means for Solving the Problems) The present invention is a pouring furnace in which a furnace body into which molten metal is charged is provided with a tilting device for controlling the tilting of the furnace body and a heating device for the molten metal, the furnace body A pouring port is provided in the furnace wall that forms the side or top surface of the furnace body above the molten metal liquid level in the upright position before tilting, and that forms the bottom surface of the furnace body in the pouring position after the furnace body is tilted. The pouring furnace is equipped with a sliding nozzle that opens and closes the opening of the pouring spout, and a sand feeder that charges sand into the pouring spout.

In this invention, a channel heater or the like that performs electromagnetic induction heating that does not contaminate the molten metal is advantageously suitable as the heating device, and the sliding nozzle is equipped with a hydraulic cylinder using a 4-servo valve to control the flow rate of the molten metal. The amount of extrusion is adjusted, and the opening area of the cylinder is adjusted.

Now, this invention will be explained in detail with reference to FIG.

In the figure, 1 is a furnace body into which molten metal 2 is charged, 3 is a charging port for molten metal 2, 4 is a pouring port, 5 is a heating device that keeps the molten metal 2 warm, and 6 is a forced tilting of the furnace body 1. It is a tilting device. The pouring spout 4 is opened and closed by a sliding nozzle 7 installed on the outer wall of the furnace body 1.

FIG. 2 shows the furnace body 1 in an upright position being tilted by a tilting device 6.
The furnace is shown in the pouring position, that is, tilted by the tilting device 6 until the furnace wall on which the pouring port 4 is formed becomes horizontal from the side to the bottom of the furnace body. When the furnace body 1 is tilted to a predetermined position, the pouring port 4 is opened by moving the sliding nozzle 7 to start pouring, and the flow N is adjusted by changing the opening area of the pouring port 4 by adjusting the amount of movement of the sliding nozzle 7. Let me do it.

5 (Function) In order to retain molten metal in the furnace for a long time, it is important to prevent leakage of molten metal from the spout and blockage in the spout.

Therefore, as shown in Figure 1, when the furnace body is upright before tilting, that is, before pouring, a pouring port is formed on the furnace wall (side or top surface of the furnace body), which is at a higher position than the area where the molten metal is held. In addition, it is effective to provide a heating device to control the temperature of the molten metal.

Next, in the pouring position after tilting the furnace body as shown in Figure 2,
In order to ensure that the molten metal falls at a single point and, if necessary, to pour all of the molten metal in the furnace, the furnace wall where the pouring spout is installed is horizontal and the pouring spout is located at the bottom of the furnace body. It is necessary to have a structure that can be tilted to a maximum angle and fixed at that tilt angle.

Furthermore, a sliding nozzle movable across the opening of the pouring spout is installed in the pouring spout in order to control the flow rate of the molten metal.

To prevent the pouring spout from being blocked by a small amount of molten metal 6 flowing into the pouring spout during the initial tilting, close the pouring spout with a sliding nozzle and fill the spout with sand before tilting is completed. It is advantageous to open the post-sliding nozzle and drain the sand before starting pouring.

(Example) FIG. 3 shows an embodiment according to the invention.

The furnace body 1 is tilted around the support portion 8 by a hydraulic cylinder 6A serving as a tilting device. On the other hand, sand 10 is supplied to the pouring port 4 from a sand feeder 9 that is movable forward and backward relative to the pouring port 4 . Note that 11 is a sand stopper.

In this example, the furnace body 1 is capable of holding 5 tons of molten metal 2, and is equipped with a channel heater 5A of maximum 200 kHz as a heating device to control the temperature of the molten metal 2. Here, the channel heater is a device that inductively heats molten metal in a flow path that forms a loop near an AC electromagnet.

Now, before the furnace body l is tilted, the pouring port 4 is closed by the sliding nozzle 7, and the pouring port 4 surrounded by the sand stopper 11 is filled with sand 10 from the sand feeder 9.

Next, the furnace body 1 is tilted by the hydraulic cylinder 68, and the tilting ends at a position where the furnace side wall where the pouring port 4 is provided becomes horizontal and becomes the bottom surface of the furnace, and the furnace body 1 is fixed. Then, move the sliding nozzle 7, open the pouring port 4, and pour the sand 10.
Drain the water and start pouring water.

When the pouring is finished, the furnace body 1 is returned to an upright position and is ready for the next charging of molten metal.

Using this pouring furnace, 5 tons of molten steel charged into the furnace was poured at a pouring rate of 4.5 ± 0.05 kg/s, and the amount remained stable until the maximum amount of remaining metal in the furnace reached 50 kg. It was possible to access the hot springs.

On the other hand, when using the above-mentioned pressurized pouring furnace, the pouring speed is 4
．． At a pressure of 5±0.20 kg/s, the amount of hot metal remaining in the furnace could not be tapped below 3 tons as the pressurization limit. Furthermore, AI, C
When holding molten steel that is easily oxidized and contains r, in a pressurized two-pouring furnace it was necessary to remove runner blockages before each pouring process, but in the pouring furnace shown in Figure 3, All maintenance work related to removing blockages was unnecessary and stable operation was achieved.

(Effects of the Invention) By using the pouring furnace of the present invention, it is possible to avoid leakage of molten metal and blockage of the pouring port while holding the molten metal, and it is also possible to achieve highly accurate flow rate control during pouring.

Therefore, the present invention can also be applied to a pouring furnace for producing rapidly cooled ribbon, which requires adjustment of the pouring speed.

[Brief Description of the Drawings] Fig. 1 is a schematic diagram showing a pouring furnace according to the present invention, Fig. 2 is a schematic diagram showing a pouring posture of the pouring furnace of Fig. 1, and Fig. 3 is a preferred embodiment of the present invention. FIG. 4 is a schematic diagram showing the embodiment, and FIG. 4 is a schematic diagram showing the pouring posture of the pouring furnace of FIG. 1... Furnace body 2... Molten metal 3...
Charging port 4...Pouring port 5...Heating device
5A...Channel heater 6...Tilt device 6A...Hydraulic cylinder 7...Sliding nozzle 8...Support part 9...Sand feeder IO・
・・Sand 11・・Sand stopper=9

Claims (1)

[Scope of Claims] 1. A pouring furnace in which a furnace body into which molten metal is charged is provided with a tilting device for controlling the tilting of the furnace body and a heating device for the molten metal, the furnace body being upright before being tilted. A pouring port is formed in the furnace wall that constitutes the side or top surface of the furnace body above the molten metal liquid level in the posture and constitutes the bottom surface of the furnace body in the pouring posture after the furnace body is tilted. is a pouring furnace equipped with a sliding nozzle that opens and closes the opening. 2. The pouring furnace according to claim 1, further comprising a sand feeder for charging sand into the pouring port.