JPH06320254A - Pouring device - Google Patents

Abstract

PURPOSE:To reduce slag generation and oxidation in pouring and to precisely control a pouring quantity to a mold by controlling a quantity of molten metal as a sealing body is closely adhered or floated on molten metal with varying pressure in the pressure chamber. CONSTITUTION:When a molten metal 5 is poured in a ladle 1 and an inert gas is blown in a pressure chamber 2 so as to turn to a pressure Pa in the pressure chamber 2, a head of a molten metal 5 entering in the pressure chamber 2 turns to Ha, a sealing body 4 is closely adhered on the upper end 3a of a pouring nozzle 3, the molten metal does not flow out from the pouring nozzle 3. Successively, a pressure in the pressure chamber 6 is reduced to Pb by a pressure controlling device 6, a head of the molten metal is raised to Hb, a sealing body 4 having a specific weight lower than that of the molten metal 5 is floated by the molten metal 5, detaching from the upper end of the pouring nozzle 3, the molten metal flows out with opening the pouring nozzle 3, pouring to a sprue of mold. Subsequently, when pressurized to Pc, the sealing body 4 is adhered on the upper end of the pouring nozzle, further, at continuing pressurization, a head of the molten metal 5 turns to Hc, stopping the molten metal 5 to flow out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouring device for automatically pouring a molten metal into a mold.

[0002]

2. Description of the Related Art A casting can be obtained by pouring molten metal in a ladle into a casting mold-shaped mold cavity. In the past, the operator operated the ladle to cast it, but from the viewpoint of eliminating high-heat work and improving efficiency, the operator has not been directly involved and pouring is performed automatically. . The automatic pouring device includes the following.

(A) Ladle tilting pouring device This lapping tilting pouring device pours the molten metal from the tap of the ladle to the mold by tilting the ladle. Then, the weight of the ladle is continuously measured using a load cell, etc., and the tilting control of the ladle is adjusted to adjust the amount of molten metal poured into the mold, or once the large ladle is poured into the small ladle. After measuring the molten metal in the pan,
For example, there is pouring from a small ladle to a mold.

(B) Stopper-type pouring device This stopper-type pouring device is provided with a stopper nozzle and a stopper rod fitted to the stopper nozzle at the bottom of the ladle, and the stopper is opened and closed to pour the molten metal into the mold. Is to do. Then, the pouring amount is adjusted by the height of the molten metal surface in the ladle, or once the stopper type large ladle is poured into the small ladle, the small ladle is weighed and poured into the mold. Etc.

(C) Pressurized pouring device This pressurizing pouring device blows air or an inert gas into a ladle with a lid to pressurize it, and then discharges the molten metal in the ladle to the outside of the ladle for pouring. It is used to make hot water, and there are methods such as opening the tap opening of the ladle to the atmosphere and using a stopper.

[0006]

However, the above-described pouring device has the following problems.

(A) Ladle Tilting Pouring Device In the ladle tilting pouring device, there is a possibility that the slag floating on the surface of the molten metal in the tilting ladle may mix into the mold together with the molten metal when pouring. In addition, since slag accumulates at the outlet, the streamline of the molten metal changes and the pouring becomes unstable.

(B) Stopper-type pouring device Since the stopper-type pouring device discharges the molten metal from the pouring nozzle at the bottom of the ladle, it is unlikely that the slag floating on the surface of the molten metal is mixed in the mold, but it is a stopper rod or pouring device. When the nozzle is eroded or broken by the molten metal, there is a problem that the molten metal leaks from the contact surface between the rod and the pouring nozzle.

(C) Pressurized pouring device Since the pressurizing pouring device performs pouring by changing the pressure in the ladle, pouring can be controlled accurately. However, since the tap hole is open to the atmosphere, there is a risk of slag formation and molten metal oxidation. Further, if the tap hole is of a stopper type, the molten metal may leak from the contact surface between the rod and the pouring nozzle.

The present invention solves the above-mentioned conventional problems, and provides a pouring device capable of accurately controlling the injection amount into a mold with less generation of slag and pouring of molten metal during pouring. The purpose is to

[0011]

Means for Solving the Problems In order to solve the above problems, a pouring device of the present invention is a pouring ladle for holding molten metal, one pouring outside the ladle and the other pouring inside the ladle. A hot water nozzle, a sealing body that can be in close contact with the upper end of the pouring nozzle and can float from the upper end of the pouring nozzle, a pouring nozzle projecting inside the ladle and a pressure chamber surrounding the sealing body, and a pressure inside the pressure chamber And a pressure control device that controls opening and closing of the sealed body by closely changing or changing the temperature.

[0012]

The operation sequence of the pouring device of the present invention will be described with reference to the operation diagram of the pouring device of the present invention shown in FIG. In FIG. 1, (a) shows a state before pouring, (b) shows a state during pouring, (c) shows a state after pouring (a) a state before pouring pouring molten metal 5 into the ladle 1. At the same time, a gas such as an inert gas is blown into the pressure chamber 2 to generate a pressure Pa in the pressure chamber 2.
Then, the head of the molten metal 5 that enters the pressure chamber 2 from the ladle 1 becomes Ha, and the sealing body 4 is the upper end 3a of the pouring nozzle 3.
The molten metal 5 does not flow out of the pouring nozzle 3.

(B) State during pouring Next, if the pressure inside the pressure chamber 2 is reduced to Pb by the pressure control device 6 from the state before pouring in (a), the molten metal 5
Head rises to Hb. Then, the sealing body 4 having a specific gravity smaller than that of the molten metal 5 is also floated by the molten metal 5, separated from the upper end 3a of the pouring nozzle 3, the pouring nozzle 3 is opened, and the molten metal 5 flows out. Pour water into the mold spout.

(C) State after pouring Next, when the pressure inside the pressure chamber 2 is increased to Pc by the pressure control device 6 from the state during pouring in (b), the molten metal 5
Head of the pouring nozzle 3 is lowered, and the sealing body 4 is held at the upper end 3a of the pouring nozzle 3.
Stick to. Then, when the pressurization is continued, the molten metal 5 descends from the upper end 3a of the pouring nozzle 3, the head becomes Hc, and the molten metal 5
Spillage stops.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pouring device according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a pouring device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a total capacity for holding molten cast iron.
00kg ladle, 3 has a nozzle inner diameter of 25 mm and an outer diameter of 75, one of which opens at the bottom of the ladle 1 and the other projects into the ladle 1.
No. 4 is a pouring nozzle, and 4 is a ball diameter of 30 m which can be closely attached to the upper end of the pouring nozzle 3 and can float from the upper end 3 a of the pouring nozzle
m is a heat-resistant ceramic encapsulation body, and 2 has an inner diameter of 85 m surrounding the pouring nozzle 3 projecting inside the ladle 2 and the encapsulation body 4.
m, the capacity when sealing the pouring nozzle by the sealing body is 2000
cc is a pressure chamber, 6 changes the pressure in the pressure chamber 2,
It is a pressure control device having a pressurizing and suction pump that controls pouring by closely contacting or floating the sealing body 4.

With the pouring apparatus of the present invention having the above-mentioned structure, casting was performed by the mold conveyed under the pouring nozzle. First, ladle 1
When 300 kg of molten metal 5 is injected and held therein, and nitrogen gas is blown into the pressure chamber 2 to set the pressure in the pressure chamber 2 to Pa, the head (Ha) of the molten metal 5 entering the inside of the pressure chamber 2 from the ladle 1
Is 100 mm, and the sealing body 4 is the upper end 3 of the pouring nozzle 3.
The molten metal 5 did not flow out from the pouring nozzle 3 in close contact with a.

Further, the slag in the poured molten metal floated between the ladle 1 and the outer wall of the pressure chamber 3, and the intrusion into the pressure chamber 3 was very small.

Next, when the pressure inside the pressure chamber 2 was reduced by the pressure control device 6 from the state before pouring, the molten metal 5 rose and the head (Hb) became 100 mm. Then, the sealing body 4 having a smaller specific gravity than the molten metal 5 floats up by the molten metal 5, separates from the upper end 3a of the pouring nozzle 3, opens the pouring nozzle 3, and the molten metal 5 flows out to the position directly below the pouring nozzle 3. It poured into the sprue of the mold provided.

After pouring a predetermined amount, when the pressure in the pressure chamber 2 is increased to Pc by the pressure control device 6 from the state during pouring, the head of the molten metal 5 descends and the sealing body 4 is a pouring nozzle. 3 was in close contact with the upper end 3a. Then, the pressurization is continued to lower the molten metal 5 from the upper end 3a of the pouring nozzle 3 to move the head (Hc) to 1
The flow rate was set to 00 mm, and the outflow of the molten metal 5 was stopped.

It was possible to obtain a sound casting free from impurities such as slag and to control pouring with high precision.

[0022]

As described above, the pouring device of the present invention is
A pouring nozzle protruding into the ladle, a sealing body that can be in close contact with the pouring nozzle upper end and float from the pouring nozzle upper end, a pouring nozzle protruding into the ladle and a pressure chamber surrounding the sealing body. , A pressure control device for changing the pressure in the pressure chamber and controlling the opening and closing of the sealing body in close contact or floating,
There is little generation of slag or oxidization of the molten metal during pouring, the amount of injection into the mold can be controlled accurately, and it is extremely useful for pouring.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

[Explanation of symbols]

1: Ladle, 2: Pressure chamber, 3: Pouring nozzle, 4: Sealing body,
5: molten metal, 6: pressure control device, 7: vacuum pump.

Claims (1)

[Claims] 1. A ladle for holding molten metal, a pouring nozzle having one opening to the outside of the ladle and the other protruding to the inside of the ladle, and a pouring nozzle that can be in close contact with the upper end of the pouring nozzle and from the upper end of the pouring nozzle. A floating sealing body, a pouring nozzle projecting into the ladle and a pressure chamber surrounding the sealing body, and a pressure control for changing the pressure in the pressure chamber to control the opening or closing of the sealing body or floating. A pouring device comprising a device.