JPH0330799B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention extends the life of the opening/closing valve of the pouring port provided at the bottom of the crucible-shaped furnace body, prevents leakage of molten metal during storage, and improves the speed at the start of pouring. The present invention relates to a crucible-shaped pouring furnace and a pouring method that can prevent molten metal from scattering.

[Prior art and its problems] Conventional examples of crucible-shaped pouring furnaces and pouring methods are shown in Part 3.
This will be explained based on the diagram. In this figure, an induction heating coil 2 is wound around the outer periphery of a crucible-shaped furnace body 1 made of a refractory material, and a cylindrical nozzle 3 having a vertical pouring port 3a is buried in the center of the bottom of the furnace body 1. There is. Directly above the pouring spout 3a is a vertical rod-shaped opening/closing valve 4 whose lower end opens and closes the pouring spout 3a.
is provided so that it can be raised and lowered, and when the on-off valve 4 is raised, the pouring port 3a is opened and the molten metal 6 heated and melted by the induction heating action of the coil 2 and stored in the inner chamber 5 is poured out. There is. During melting and heat retention, the on-off valve 4 is lowered to close the pouring port 3a.

In such pouring furnaces and pouring methods, the on-off valve 4 is in contact with the molten metal 6 during melting and warming, so the life of the on-off valve 4 is shortened due to the heat shock. Furthermore, there is a drawback that molten metal leaks if the on-off valve 4 does not come into close contact with the nozzle 3 due to the adhesion of slag etc. during temperature storage.

[Purpose of the invention]

In order to eliminate the above-mentioned drawbacks, this invention extends the life of the opening/closing valve of the pouring port provided at the bottom of the furnace body, prevents leakage of molten metal during storage, and prevents molten metal from scattering when pouring starts. An object of the present invention is to provide a crucible-shaped pouring furnace and a pouring method.

[Key points of the invention]

In order to achieve the above object, this invention provides an on-off valve near the bottom of the furnace body for opening and closing the pouring port from the outside, and also provides a cooling device on this on-off valve.
By appropriately cooling the on-off valve during hot water storage to solidify or semi-solidify the molten metal at the bottom of the spout, the life of the on-off valve is extended, and molten metal leaks during hot water storage and molten metal scattering when pouring starts is prevented. This is what I did.

[Embodiments of the invention]

FIG. 1 shows an embodiment of a crucible-shaped pouring furnace of the present invention, and the same parts as in FIG. 3 are denoted by the same reference numerals. In this figure, a cylindrical nozzle 13 having a vertical spout 13a is buried in the bottom of the furnace body 1, and an on-off valve 14 for opening and closing the spout 13a from the outside is provided at the bottom of the furnace body 1. There is.
This on-off valve 14 is equipped with a cooling device 15 and can move in the horizontal direction together with this cooling device 15. As shown in FIG. 2, the cooling device 15 consists of a double hollow pipe 16 held concentrically, a flow rate adjustment valve 17 for the refrigerant (water, air, etc.) passing through the pipe 16, and a flow rate detector 18. The tip of the outer pipe 16 is screwed onto the lower surface of the on-off valve 14. The refrigerant is fed through the inner pipe 16, cools the on-off valve 14, and then is discharged through between the outer and inner pipes 16. The joint between the on-off valve 14 and the nozzle 13 is formed into a spherical surface so as to be in close contact with each other. The pouring port 13a may be formed directly at the bottom of the furnace body 1 without using the nozzle 13, or may be provided at any position near the bottom of the furnace as long as the desired total amount of molten metal 6 can be poured out. No problem. That is, if a diagonally horizontal pouring port is provided in the rising portion near the bottom of the furnace, the molten metal will be discharged in a parabolic manner, but there is an advantage that the device for receiving the molten metal does not need to be placed directly under the furnace body 1. Further, the cooling device may be a heat pipe having the on-off valve 14 as a heat receiving part.

After closing the pouring port 13a, the molten metal 6 is heated and melted by the induction heating action of the coil 2 and stored in the inner chamber 5.
Alternatively, the molten metal 6 being kept warm is adjusted to the amount of refrigerant in the cooling device 15 to cool the on-off valve 14 appropriately, so that the molten metal 6 at the lower part of the pouring port 13a that comes into contact with it becomes solidified or semi-solidified. In this state, the on-off valve 14
When the pouring port 13a is opened by moving the metal in the horizontal direction, pouring starts after a short period of time to melt the solidified or semi-solidified metal. After pouring, the on-off valve 14 is moved to close the pouring port 13a again, but
Since the molten metal 6 may scatter if the pouring port 13a is attempted to be closed during pouring due to the slight time lag between the start of pouring, this method is suitable for pouring the entire desired amount of molten metal at one time.

According to the embodiment, the on-off valve 14 is provided with the cooling device 15 on the outside of the furnace body 1, and the contact area with the molten metal 6 is reduced, so that the heat shock of the on-off valve 14 is reduced and the life of the on-off valve 14 is extended. Even when the pipe 16 needs to be replaced due to wear, it can be easily replaced since it is screwed onto the tip of the pipe 16. Further, the on-off valve 14 and the pouring port 13a are in close contact with each other due to their spherical surfaces, and even if they are not in close contact due to adhesion of slag, etc., the molten metal 6 at the bottom of the pouring port 13a is solidified or semi-solidified during hot water storage to prevent molten metal leakage. Since there is a slight time lag at the start of pouring, the on-off valve 14 can be moved without getting wet with the molten metal 6, and a constant amount of molten metal can be poured without being hindered by the on-off valve 14. The on-off valve 14
The material may have a corrosion resistance strength comparable to or less than that of conventional examples, and is preferably carbon, silicon carbide, etc., which have good wettability.

〔Effect of the invention〕

According to the present invention, in a crucible-type pouring furnace and pouring method, an on-off valve is provided for opening and closing the pouring port provided near the bottom of the furnace body from the outside, and a cooling device is provided on this on-off valve. By appropriately cooling the molten metal near the pouring port to a solidified or semi-solidified state, it is possible to extend the life of the on-off valve and prevent molten metal leakage during storage and molten metal scattering when pouring starts. You can get the effect that you can.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of an embodiment of the pouring furnace of the present invention, FIG. 2 is an enlarged vertical cross-sectional view of the main part of FIG. 1, and FIG. 3 is a vertical cross-sectional view of a conventional example. 1...Furnace body, 2...Coil, 5...Inner chamber, 6...
...Molten metal, 13a...Pouring port, 14...Opening/closing valve, 1
5... Cooling device.

Claims (1)

[Scope of Claims] 1. A pouring port is provided near the bottom of a crucible-shaped furnace body with an induction heating coil wound around the outer periphery, and an on-off valve for opening and closing the pouring port from the outside is provided, and a cooling device is attached to this on-off valve. This is a crucible-shaped pouring furnace. 2 The molten metal melted by the action of an induction heating coil wrapped around the outer circumference of the crucible-shaped furnace body and stored in the inner chamber is cooled through a pouring hole provided near the bottom of the furnace body, which can be opened and closed from the outside. A pouring method in which the desired amount of molten metal is poured in one go by opening and closing an on-off valve equipped with a device, characterized in that the on-off valve is appropriately cooled during storage to bring the molten metal at the bottom of the pouring spout into a solidified or semi-solidified state. Pouring method.