JPH06339765A - Molten metal pouring apparatus - Google Patents

Abstract

(57) [Summary] [Purpose] There is little generation of slag or oxidation of the molten metal during pouring, the amount of injection into the mold can be accurately controlled, and pouring can be done vigorously even in the latter half of each pouring. Obtain a pouring device that can. [Structure] The pouring device 1 has a hot water storage chamber 2, and the hot water storage chamber 2 has a suction control means 3 for the molten metal 9 and a bottom portion 10 in a ladle 8.
A suction nozzle 3 for sucking the molten metal 8 more, a discharge nozzle 5 for discharging the molten metal 8 into the molten metal port 13 of the mold 11 and a pressure control means 7 for changing the pressure in the molten metal storage chamber 2. And are installed in series. The suction control means 3 is a sealing body 14 which can be in close contact with and float on the upper portion 3a of the suction nozzle 3 protruding into the hot water storage chamber 2.

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., the tilt of the ladle is controlled, the pouring amount to the mold is adjusted, or once the large ladle is poured into the small ladle. For example, after measuring the molten metal in the ladle, the small ladle is poured into the 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 for hot water, and the tap opening of the ladle is opened to the atmosphere or made into a stopper type.

[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.

Further, tilting of the ladle may be accompanied by severe vibration, and the weight of the ladle cannot be accurately measured by the load cell, and it is difficult to control pouring with high accuracy. In addition, with the method of measuring the weight of the molten metal in the small ladle, it is difficult to pour clean molten metal into the mold when the molten metal is transferred from the large ladle to the small ladle, causing slag and oxidation of the molten metal. .

(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 into the mold, but when the stopper rod is moved up and down. Since the pouring nozzle is opened and closed, it is necessary to slightly move the stopper rod up and down in order to adjust the pouring amount, and since the molten metal head changes, it is difficult to pouring a fixed amount accurately every time.

(C) Pressurized pouring device Since the pressurizing pouring device performs pouring by changing the pressure in the ladle, the pouring amount can be adjusted only by adjusting the pressure value in the ladle. Pouring can be controlled accurately and accurately. However, since the tap hole is open to the atmosphere, there is a risk of slag formation and molten metal oxidation. Further, since the molten metal is replenished to the pressure type ladle from the holding furnace or the tilting ladle, slag is easily generated and the molten metal is easily oxidized at this time.

The present invention solves the above-mentioned problems of the prior art, generates less slag during pouring and oxidizes the molten metal, controls the injection amount into the mold with high accuracy, and is effective in the latter half of each pouring. It is an object of the present invention to provide a pouring device capable of pouring well.

[0012]

In order to solve the above problems, the pouring device of the present invention is a pouring device for pouring molten metal (9) in a ladle (8) into a cavity (12) in a mold (11). A device (1), wherein the pouring device (1) has a hot water storage chamber (2)
The hot water storage chamber (2) has a suction control means (3) for the molten metal (9), and a suction nozzle (3) for sucking the molten metal (8) from the bottom (10) in the ladle (8). A discharge nozzle (5) having a discharge control means (6) for discharging the molten metal (8) to discharge the molten metal into the spout (13) of the mold (11), and a pressure capable of changing the pressure in the hot water storage chamber (2). It is characterized in that it is provided in series with the control means (7).

In the pouring device (1), the suction control means (3) has a suction nozzle (3) protruding into the hot water storage chamber (2).
The sealing body (1
It consists of 4).

Further, the hot water storage chamber (2) is filled with an inert gas.

The operation sequence of the pouring device of the present invention will be described based on the operation diagram of the pouring device of the present invention shown in FIG. In FIG. 1, (a) shows a state before the molten metal is sucked into the hot water storage chamber, (b) shows a state where the molten metal is being sucked into the hot water storage chamber, and (c) shows a state where the molten metal is being discharged into the mold.

(A) State before suction in hot water storage chamber Ladle 8 and mold 11 to which molten metal 9 has been replenished are prepared.
Then, the lower portion of the suction nozzle 3 of the pouring device 1 is immersed in the molten metal 9 near the bottom portion 10 of the ladle 8, and the discharge nozzle 5 is positioned above the gate 13 of the casting mold 11. At this time, an inert gas is blown into the hot water storage chamber 2 and the pressure is adjusted to P
It is set to a. The pressure Pa in the hot water storage chamber 2 may be zero if the sealing body 14 can seal the upper portion 3a of the suction nozzle 3 by its own weight. The discharge nozzle 5 is closed by a discharge control means 6 such as a stopper.

In this state, the molten metal 9 is not sucked into the hot water storage chamber 2. (B) State in which molten metal is being sucked into the hot water storage chamber Next, with the discharge nozzle 5 closed, the pressure inside the hot water storage chamber 2 is reduced to Pb by the pressure control means 7 from the state before suction in (a). Then, a gap is created between the upper portion 3a of the suction nozzle 3 and the sealing body 14 which is the suction control means 3, and
The molten metal 9 is sucked, rises in the suction nozzle 3 and overflows, and is stored in the hot water storage chamber 2. As for the amount of hot water stored in the hot water storage chamber 2, a certain amount of hot water to be poured is stored by measuring the pressure control means 7 or before and after hot water storage in the hot water storage chamber 2. . Since the specific gravity of the molten metal in the upper part of the ladle 8 is small, it floats between the ladle 1 and the outer wall of the suction nozzle 3, and the intrusion into the hot water storage chamber 2 is very small. In addition, since the hot water storage chamber 2 has an inert gas atmosphere, oxidation of the molten metal is extremely small.

(C) State in which molten metal is being discharged into the mold Next, the pressure in the hot water storage chamber 2 is adjusted by the pressure control means 7 to (b).
When the pressure is increased to Pc from the state during suction, the sealing body 14 which is the suction control means 3 seals the upper portion 3a of the suction nozzle 3.

When the discharge nozzle 5 is opened by the discharge control means 6, a predetermined amount of molten metal stored in the hot water storage chamber 2
It is discharged and the cavity 12 is filled from a sprue 13 provided directly below the discharge nozzle 5.

When the pressure Pc is gradually increased during the discharge so as to change the pressure Pc, the molten metal can be poured with appropriate momentum according to the state of being drunk into the cavity 12.

[0020]

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, 2 is a total capacity of 50 for storing molten cast iron.
It is a hot water storage room filled with kg of nitrogen gas. The hot water storage chamber 2 is provided with a suction nozzle having an inner diameter of 25 mm and an outer diameter of 75, one of which is opened to the bottom portion 10 of the ladle 8 and the other of which is projected into the hot water storage chamber 2. And, in the upper part 3a of the suction nozzle 3,
A heat-resistant ceramic sealing body having a spherical diameter of 30 mm is provided which can be in close contact with the upper portion 3a of the suction nozzle 3 and can float from the upper portion 3a of the suction nozzle 3.

Further, the hot water storage chamber 2 is provided with a discharge nozzle 5 having an inner diameter of 25 mm and an outer diameter of 75, which can discharge the molten metal to the spout 13 of the mold 11, and a stopper 6 connected to the reciprocating cylinder is provided above the discharge nozzle 5. There is.

The hot water storage chamber 2 is also provided with a pressure control means 7 having a pressurizing and suction pump capable of changing the pressure in the hot water storage chamber 2.

An example of casting using the casting apparatus of the present invention having the above-mentioned construction, using a mold conveyed immediately below the discharge nozzle will be described.

First, the suction nozzle 3 is immersed in the ladle 8 in which 300 kg of the molten metal 9 has been poured and held, and the discharge nozzle 5 is positioned above the gate 13 of the mold 11. Next, the pressure in the hot water storage chamber 2 is set to Pa by blowing nitrogen gas. At this time, the discharge nozzle 5 is closed by the stopper 6. In this state, the molten metal 9 is not sucked into the hot water storage chamber 2.

Next, when the pressure in the hot water storage chamber 2 is reduced to Pb by the pressure control means 7 with the discharge nozzle 5 kept closed, the upper part 3a of the suction nozzle 3 and the suction control means 3 are set. A gap is formed between the molten metal 6 and the sealing body 14, and the molten metal 6 is sucked and rises in the suction nozzle 3 to overflow and is stored in the hot water storage chamber 2. As for the amount of hot water stored in the hot water storage chamber 2, a certain amount of hot water should be poured by the pressure control means 7.

Therefore, in the hot water storage chamber 2, the slag in the molten metal above the ladle 8 floats between the ladle 1 and the outer wall of the suction nozzle 3,
Intrusion into the hot water storage chamber 2 is very small. In addition, hot water storage room 2
Since the inside is an inert gas atmosphere, there is very little oxidation of the molten metal.

Next, when the pressure in the hot water storage chamber 2 is increased to Pc by the pressure control means 7 from the state during suction, the sealing body 14 as the suction control means 3 seals the upper portion 3a of the suction nozzle 3. To do. Then, the discharge control means 6 discharges the discharge nozzle 5
When opened, the molten metal stored in the hot water storage chamber 2 is discharged to the spout 13 provided directly below the discharge nozzle 5 to fill the cavity 12 with a predetermined amount. During discharge, gradually increase the pressure Pc,
Depending on the state in which the molten metal is being dripped into the cavity 12, the force is increased and the molten metal is appropriately poured.

By using the pouring device of the present invention, impurities such as slag and oxides are not mixed in, and the pouring is performed properly so that a healthy thin casting can be cast.

[0030]

As described above, the pouring device of the present invention is
The hot water storage chamber has a molten metal suction control means for sucking the molten metal from the bottom of the ladle, the molten metal discharge control means for discharging the molten metal to the mouth of the mold, and the pressure inside the hot water storage chamber is changed. The suction control means is a sealing body that can be in close contact with the upper part of the suction nozzle protruding into the hot water storage chamber and can float above the suction nozzle, and the hot water storage chamber is filled with an inert gas. Therefore, impurities such as slag and oxide are not mixed in, and a predetermined amount is urged to appropriately pour molten metal, so that a healthy thin casting can be cast.

[Brief description of drawings]

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

[Explanation of symbols]

1: pouring device, 2: hot water storage chamber, 3: suction nozzle,
4: Suction control means, 5: Discharge nozzle, 6: Discharge control means, 7: Pressure control means, 8: Ladle, 9: Molten metal, 1
0: bottom, 11: mold, 12: cavity, 13: sprue, 14: sealed body.

Claims (3)

[Claims] 1. A molten metal (9) in a ladle (8) is cast into a mold (1).
1) A pouring device (1) for pouring molten metal into an inner cavity (12), the pouring device (1) having a hot water storage chamber (2),
The hot water storage chamber (2) has a suction control means (3) for the molten metal (9) and a suction nozzle (3) for sucking the molten metal (8) from the bottom (10) in the ladle (8), and the molten metal (9). ) Discharge control means (6) for discharging molten metal into the sprue (13) of the mold (11), and pressure control means (7) capable of changing the pressure in the hot water storage chamber (2). A pouring device (1) characterized by being provided in series. 2. The suction control means (3) comprises a sealing body (14) which can be in close contact with and float on the upper part (3a) of the suction nozzle (3) protruding into the hot water storage chamber (2). The pouring device (1) according to claim 1. 3. The pouring device (1) according to claim 1, wherein the hot water storage chamber (2) is filled with an inert gas.