JPH0788630A - Weighing quantity of molten metal - Google Patents

Abstract

PURPOSE:To accurately weigh molten metal quantity and eliminate the mingle of the oxide into a product while preventing the oxidation of molten metal by arranging a weighing chamber as a basin part of the molten metal, varying the pressure of a closed space, dipping up the molten metal and supplying. CONSTITUTION:After filling up the molten metal 3 into a temp. holding furnace 2, a molten metal supplying hole 8 in the weighing chamber 6 is closed with a valve rod 9, a weight 12 is set to a specific height according to a specific weighing value. Then gas in the upper space 11 is fed into a tank 15 with a pump 16 and at the time of reaching the pressure in the upper space 11, the molten metal surface of the passage 5 is risen and overflowed through a molten metal inlet 7 and flowed down to the weighing chamber 6. When the molten metal surface reaches the upper part from the molten metal inlet 7, the pump 16 is reversely driven and the pressure in the upper space 11 is risen to the atmospheric pressure or higher, and the valve rod 9 is risen to open the hole and the molten metal 3 is supplied into the metallic mold 18 from the molten metal supplying hole 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to supplying a predetermined amount of molten metal to a molding die.

[0002]

2. Description of the Related Art Generally, when supplying molten metal to a molding die, a heat retaining furnace is installed on the side of the molding machine, and the molten metal held in the heat retaining furnace is pumped and supplied by the ladle of the water heater. As such a ladri, one disclosed in Japanese Patent Laid-Open No. 3-258455 is considered. With the technology disclosed in this, it is possible to prevent the oxides floating on the hot water surface of the furnace from being pumped, but the hot water surface of the molten metal is oxidized in the ladle,
In addition, conductive icicle-shaped metal such as an oxide film adheres to the molten metal level detection rod, making it difficult to accurately measure the molten metal.

[0003]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to supply an accurately measured and completely oxide-free melt to a molding die.

[0004]

To this end, a heat-retaining furnace filled with the melt and an outlet for the melt are formed at the bottom of the bottom surface of the heat-retaining furnace, and a passage that is in closed communication with the outlet and the other end of the passage are formed. It is composed of a connected and sealed measuring chamber, the inlet provided above the measuring chamber for molten metal at a higher position than the molten metal surface is connected to the outlet of the warming furnace through the passage, and the molten metal is arranged below the measuring chamber. A supply port for discharging to the mold and a means for opening and closing the supply port in the measuring chamber, and a means for pressurizing and discharging the inert gas into the measuring chamber are provided. Also, an object heavier than the molten metal is hung vertically downward in the measuring chamber with the horizontal line of the molten metal inlet at a middle position.

[0005]

When the temperature of the heating chamber is filled with the molten metal and then the gas in the measuring chamber is discharged with the supply port of the measuring chamber being closed, the molten metal surface of the passage rises and approaches the inlet of the measuring chamber. Will flow into the metering chamber and will be filled beyond the height of the inlet of the metering chamber. After that, when gas is pressed in, the level of the molten metal gradually drops, and when reaching the inlet, the level of the molten metal becomes stable on the side of the measuring chamber, and the level of the molten metal on one side or the passage continues to drop. When the pressure of the gas exceeds the atmospheric pressure, the supply port of the measuring chamber is opened and the molten metal is discharged. By doing so, since the pressure in the measuring chamber is large, outside air does not flow into the measuring chamber, and the volume below the inlet of the measuring chamber is always constant, so that an accurate amount of molten metal can be supplied to the mold. Further, since the volume below the stable molten metal surface is reduced by the volume of the suspended object protruding to the horizontal line at the entrance of the measuring chamber, the measured value can be changed.

[0006]

The invention is illustrated in the drawings. FIG. 1 is an overall cross-sectional view of an apparatus 1 of the present invention, and 2 is a heat retaining furnace filled with a molten metal 3, which is always kept warm by a heater 4. Reference numeral 5 denotes a passage communicating with each other, and 6 denotes a measuring chamber. Weighing room 6
A molten metal inlet 7 is connected to the passage 5 above the molten metal surface of the heat insulation furnace 2. Further, a molten metal supply port 8 is opened at the bottom of the measuring chamber 6, and a valve rod 9 is attached to the molten metal supply port 8 by an opening / closing means 10 so as to be openable and closable. In addition, in the upper space 11 of the weighing chamber 6, a food resistant material 12 is attached to a hoisting means 14 via a rope 13. Further, an upper space 11 of the measuring chamber 6 is connected to an inert gas container 15 as a pressurizing / depressurizing means through a pump 16 capable of rotating in the forward and reverse directions. Reference numeral 17 is a heat insulating material or a heat insulating heater that is externally mounted to keep the molten metal warm.

Next, the operation of measuring the molten metal will be described. Molten metal 3
After the filling is completed, the melt supply port 8 of the measuring chamber 6 is closed by the opening / closing means 10, the valve rod 9 is closed, and the container 12 is set to a predetermined height according to a predetermined measured value, and then the pump 16 is placed above the measuring chamber. The gas in the space 11 is sent to the tank 15. Then, the pressure in the upper space 11 of the measuring chamber 6 decreases, the molten metal surface of the heat insulating furnace 2 descends and the molten metal surface of the piece or the passage 5 rises, and flows over the molten metal inlet 7 into the measuring chamber 6. Then, when the surface of the molten metal reaches above the molten metal inlet 7, the pump 16 is reversed to raise the upper space 11 of the measuring chamber 6 to the atmospheric pressure or more, and then the valve rod 9 is opened by the opening / closing means 10 to open from the molten metal supply port 8. The molten metal is supplied to the mold 18. Then, since the pressure of the inert gas in the measuring chamber 6 is always higher than the atmospheric pressure, the molten metal is not oxidized during the measurement, oxygen or the like does not flow into the measuring chamber, and the molten metal is below the surface of the heat insulation furnace 2. Therefore, the oxide floating on the molten metal surface is not supplied to the mold.

FIG. 2 shows a pressurizing and depressurizing means 19 of another embodiment relating to pressurizing and depressurizing an inert gas. A vacuum tank is provided through a depressurizing solenoid valve 20 which is opened when the molten metal is pumped into the measuring chamber 6 from the passage 5. 21 is connected by a connecting pipe. The vacuum tank 21 is connected to a container 15 of inert gas at atmospheric pressure or higher via a vacuum pump 22 so that the vacuum tank 21 always maintains a substantially vacuum state. The inert gas container 15 is connected to the measuring chamber 6 via a pressurizing electromagnetic valve 23 that opens when the molten metal is discharged. In this way, by opening the pressure reducing solenoid valve 20 when pumping the vacuum tank 21 into the molten metal, the upper space 11 can be quickly depressurized, and the vacuum tank 21 is always kept in vacuum by the vacuum pump 22 and, conversely, a container of inert gas. 15
A pressure equal to or higher than the atmospheric pressure is maintained at, and the upper space 11 can be quickly pressurized by opening the pressurizing solenoid valve 23.
Therefore, if the pressurizing means 19 is provided, the pumping operation can be performed quickly, which is practical.

FIG. 3 shows the winding means 14 of the carton. The vertical height of the drum is calibrated by the rotation angle of the drum 25 driven by the worm gear 24. And packing 2
The upper space 11 of the measuring chamber 6 is isolated from the outside at 6. Therefore, with the volume of the sinker 12 submerged in the molten metal, the measuring chamber inlet 7
Since the volume of molten metal below the (virtual pool surface of the reservoir) is changed, accurate and fine adjustment of measurement is possible. Further, although the level gauge and the like necessary for control are omitted, it goes without saying that they are installed appropriately.

[0010]

As described above, since the molten metal is pumped up and supplied by changing the pressure of the space of the closed measuring chamber by setting the molten metal reservoir, it is possible to accurately measure a predetermined amount of molten metal. And, because the inert gas was used as the working gas, it was possible to prevent the oxidation of the molten metal and eliminate the inclusion of hard spots in the product.

[Brief description of drawings]

FIG. 1 is an overall cross-sectional view of the device of the present invention.

FIG. 2 is an example of another pressurization / decompression unit.

FIG. 3 is a detailed view of winding means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Device 2 Heat-retaining furnace 3 Molten metal 4 Heater 5 Passage 6 Measuring chamber 7 Molten metal inlet 8 Molten metal supply port 9 Valve rod 10 Opening / closing means 11 Upper space 12 Retaining 13 Rope 14 Hoisting means 15 Container 16 Pump 17 Heat insulating material 18 Mold 19 Pressurization Pressure reducing means 20 Pressure reducing solenoid valve 21 Vacuum tank 22 Vacuum pump 23 Pressurizing solenoid valve 24 Worm gear 25 Drum 26 Packing

Claims (4)

[Claims] 1. A warming furnace filled with molten metal, a passage communicating with the bottom of the warming furnace, and a measuring chamber in a sealed state connected to the other end of the heating chamber. The molten metal inlet is in contact with above the virtual molten metal surface of the reservoir and is connected to the passage above the molten metal surface of the heat-retaining furnace. A means for depressurizing and pressurizing the space is provided, and the depressurizing means fills the measuring chamber with the molten metal up to the virtual level, pressurizing means pressurizes it to atmospheric pressure, and then the opening / closing means opens it to supply the molten metal to the mold. A method for measuring and supplying molten metal, characterized by: 2. The method for measuring and supplying a molten metal according to claim 1, wherein an inert gas is used as means for decompressing and pressurizing the space. 3. A method for measuring and supplying a molten metal according to claim 1, wherein a vacuum tank and a surge tank are connected to the means for depressurizing and pressurizing the space. 4. The weighing and supplying method according to claim 1, wherein the weighing value is changed by variably decreasing the volume below the virtual molten metal surface of the reservoir of the weighing chamber.