JP2005313218A - Molten metal feeding unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molten metal feeding unit which hardly entrains a gas such as air into molten metal and hardly varies the volume of the molten metal to be fed into a mold. <P>SOLUTION: A molten metal pump 7 can suck or discharge the molten metal 2 by reciprocating a piston 6 in a cylinder 5. The molten metal pump 7 is set up so that the cylinder is submerged in the molten metal inside the holding furnace 1. A molten metal feeding pipeline 8 is connected to the cylinder so that the molten metal discharged from the cylinder can be fed into the mold B1. A communicating pipeline 4 is provided, of which one end is dipped in the molten metal inside a melting furnace 3 and the other end is dipped in the molten metal inside the holding furnace. There is provided a feeding mechanism 30 which can suck and feed the molten metal from the melting furnace to the holding furnace through the communicating pipeline in conjunction with the molten metal feeding action of the molten metal pump so that the liquid surface level C of the molten metal inside the holding furnace can be kept almost constant, regardless of the action of the molten metal pump of feeding the molten metal into the mold. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  According to the present invention, a melt pump capable of sucking and discharging a molten metal by reciprocating a piston in a cylinder is installed so that the cylinder sinks into the molten metal in a holding furnace, and the cylinder is discharged from the cylinder. The present invention relates to a molten metal hot water supply apparatus connected to a hot water supply pipe capable of supplying molten metal to a mold.

In the above-mentioned molten metal hot water supply apparatus, when a molten metal pump capable of sucking and discharging the molten metal is installed in the holding furnace by reciprocating the piston in the cylinder, a high temperature molten metal that easily reacts with oxygen and the like is activated and discharged. If a sealing material is provided at the sliding part between the cylinder and the piston, foreign matter such as metal oxides can easily get caught between the sliding surfaces, and the piston cannot be moved smoothly. There is.
For this reason, conventionally, such a sealing material has not been provided in the sliding portion, and a certain amount of clearance is provided between the sliding surfaces so that a foreign matter such as a metal oxide is not easily caught between the sliding surfaces. The piston is configured to reciprocate, and the cylinder has a molten metal in the holding furnace so that the molten metal leaking from the clearance between the sliding surfaces does not harden or be released outside the furnace. It is set to sink inside.
Since the amount of hot water supplied to the mold every time the piston reciprocates is determined according to the stroke of the piston, when setting the amount of hot water supplied to the mold, the metal from the clearance between the sliding surfaces every time the piston reciprocates once The amount of molten metal leaking is predicted in advance, and the stroke of the piston in the cylinder is set so that the amount of hot water added is the amount of leakage (this is a well-known technique and information on prior art documents cannot be disclosed). .
Also, when the molten metal melted in the melting furnace is moved to the holding furnace and the molten metal in the holding furnace is supplied to the mold, the molten metal in the melting furnace is put into a ladle and transferred to the holding furnace. Has a drawback that gas such as air can easily be entrained in the molten metal, so degassing treatment is carried out in the holding furnace so that casting defects do not occur (it is a well-known technique and discloses prior art document information) In order to solve this drawback, the melting furnace and the holding furnace are connected to each other under the surface of the molten metal so that the molten metal melted in the melting furnace naturally flows into the holding furnace. Conventionally, a hot water supply apparatus configured to supply molten metal that naturally flows into the holding furnace to the mold is also known (it is a well-known technique and information on prior art documents cannot be disclosed).

As described above, the hot water supply apparatus configured to connect the melting furnace and the holding furnace to each other below the surface of the molten metal and supply the molten metal that naturally flows into the holding furnace from the melting furnace to the mold. There is an advantage that gas such as air is difficult to be entrained in the molten metal, but there is a disadvantage that the amount of hot water supplied to the mold is easily changed.
In other words, the melting furnace and the holding furnace are connected to each other under the surface of the molten metal, and the molten metal that naturally flows from the melting furnace to the holding furnace is supplied to the mold, so according to the amount of hot water supplied to the mold, The liquid level of the molten metal in the melting furnace and holding furnace will decrease, and due to the decrease in the liquid level, the amount of leakage of the molten metal from the clearance between the sliding surfaces each time the piston reciprocates will also be As a result, even if the piston is driven with a stroke that is set to the amount of leakage that has been predicted in advance, the actual amount of hot water supplied to the mold changes each time the piston reciprocates. Because it is.
This invention is made | formed in view of the said situation, Comprising: It aims at providing the hot_water | molten_metal hot_water | molten_metal supply apparatus with which gas, such as air, is hard to be caught in a molten metal, and the amount of hot_water | molten_metal supply to a casting_mold | template does not change easily.

  A first characteristic configuration of the present invention is that a melt pump capable of sucking and discharging a molten metal by reciprocating a piston in a cylinder is installed so that the cylinder sinks into the molten metal in a holding furnace. A molten metal hot water supply device connected with a hot water supply pipe capable of supplying molten metal discharged from a cylinder to a mold, one end of which enters into the molten metal in the melting furnace, and the other end is the holding furnace. In order to maintain a liquid surface height of the molten metal in the holding furnace at a substantially constant height regardless of the hot water supply operation to the mold by the molten metal pump, providing a communication pipe that enters the molten metal in the inside, In connection with the hot water supply operation, there is provided a supply mechanism capable of sucking and supplying the molten metal in the melting furnace into the holding furnace through the communication pipe line.

[Action and effect]
One end side enters into the molten metal in the melting furnace and the other end side enters into the molten metal in the holding furnace, and the molten metal in the melting furnace passes through the communicating pipe in the holding furnace. Since a supply mechanism capable of suction supply is provided, when supplying the molten metal in the melting furnace into the holding furnace, it can be supplied in a state in which gas such as air is difficult to be caught in the molten metal through the communication conduit. .
In addition, the supply mechanism is linked to the hot water supply operation so that the liquid level of the molten metal in the holding furnace can be maintained at a substantially constant height regardless of the hot water supply operation to the mold by the molten metal pump. Since the molten metal is provided in the holding furnace so that it can be sucked and supplied, there is little possibility that the amount of leakage of the molten metal from the clearance between the sliding surfaces each time the piston reciprocates will change. Even if the piston is driven with a stroke set so that the amount of leaked water is added, the actual amount of hot water supplied to the mold hardly changes every time the piston reciprocates once.

  According to a second characteristic configuration of the present invention, in order to configure the supply mechanism, the inside of the cylinder is partitioned into a first cylinder chamber and a second cylinder chamber with the piston interposed therebetween, and the piston is moved to one side. Then, when discharging the molten metal in the first cylinder chamber to the hot water supply pipe, the molten metal in the melting furnace is sucked into the second cylinder chamber through the communication pipe, and the piston is moved to the other side. When moving and sucking the molten metal in the holding furnace into the first cylinder chamber, the molten metal in the second cylinder chamber is discharged into the holding furnace.

[Action and effect]
In order to constitute a supply mechanism capable of sucking and supplying the molten metal in the melting furnace into the holding furnace through the communication pipe line, the cylinder is divided into a first cylinder chamber and a second cylinder chamber with a piston interposed therebetween. Then, when the piston is moved to one side and the molten metal in the first cylinder chamber is discharged to the hot water supply pipe, the molten metal in the melting furnace is sucked into the second cylinder chamber through the communication pipe. As the molten metal is supplied to the mold, approximately the same amount of the molten metal is sucked into the second cylinder chamber in a timely manner so that the level of the molten metal in the holding furnace is kept at a substantially constant height. Can be maintained.
Further, for example, the first cylinder chamber and the second cylinder chamber are alternately arranged in a hot water supply line and a communication line so that the liquid level of the molten metal in the holding furnace can be maintained at a substantially constant height. Provided to allow communication, the molten metal sucked into the first cylinder chamber is linked to the hot water supply operation for supplying the molten metal to the mold through the hot water supply pipe, and the molten metal in the melting furnace is sucked into the second cylinder chamber through the communication pipe. The molten metal sucked into the second cylinder chamber is linked to the hot water supply operation for supplying hot water to the mold through the hot water supply pipe, and the molten metal in the melting furnace is sucked into the first cylinder chamber through the communication pipe. In this case, since there is no replacement of the molten metal in the holding furnace, the metal oxide easily accumulates in the molten metal in the holding furnace, and the molten metal in the melting furnace is sucked into the first or second cylinder chamber. When it accumulates in the molten metal in the holding furnace. And the metal oxide accidentally sucked through the clearance between the sliding surfaces, a possibility is high that biting metal oxide between the sliding surfaces.
As opposed to the above, when the molten metal in the holding furnace is sucked into the first cylinder chamber by moving the piston to the other side, the molten metal in the second cylinder chamber is discharged into the holding furnace. In order to prevent the accumulation of metal oxides in the molten metal, replace the molten metal for the amount of hot water supplied to the mold with the molten metal in the melting furnace while keeping the liquid level of the molten metal in the holding furnace at a substantially constant height. The metal oxide can be kept between the sliding surfaces when the molten metal in the holding furnace is sucked into the first cylinder chamber.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 4 show a metal for supplying a molten metal (hereinafter simply referred to as a molten metal) 2 such as an aluminum alloy or a magnesium alloy as an example of a molten metal stored in a holding furnace 1 to a mold B1 of a casting apparatus B. 1 shows a hot water supply device A, a holding furnace 1 and a melting furnace 3 for melting a metal, one end side of which enters into the molten metal 2 in the melting furnace 3 and the other end side into the molten metal 2 in the holding furnace 1. It is connected in communication with a communicating pipe 4 made of ceramic.

  The hot water supply device A includes a melt pump 7 capable of sucking and discharging the molten metal 2 by reciprocating a ceramic piston 6 mounted in a ceramic cylinder 5 up and down, and the cylinder 5 in the molten metal 2 in the holding furnace 1. A hot water supply pipe 8 that can be set so as to sink into the mold B1 and can supply the molten metal 2 discharged from the cylinder 5 to the mold B1 is connected to the cylinder 5 via a first valve mechanism 9 described later.

  The molten metal pump 7 is installed in such a manner that the cylinder 5 is fixed to the furnace lid 10 so that the cylinder axis is along the vertical direction and sinks in the molten metal 2. 1 cylinder chamber 11 and a lower second cylinder chamber 12, which communicates the first cylinder chamber 11 with the holding furnace 1 and blocks communication with the hot water supply pipe 8 of the first cylinder chamber 11. A first valve mechanism 9 that is switchable between a suction state to be performed and a discharge state in which the first cylinder chamber 11 is communicated with the hot water supply pipe 8 and the communication between the first cylinder chamber 11 and the holding furnace 1 is interrupted; A rod lifting / lowering device 14 for lifting / lowering the rod 13 connected to the piston 6 is provided, and the molten metal 2 is provided so as to be able to perform a suction / discharge operation.

  The first valve mechanism 9 fixes the cylindrical first valve box 15 over the furnace lid 10 and the upper part of the cylinder 5 so that the lower end of the first valve box 15 sinks into the molten metal 2, and the first valve rod 16 The integrally formed first valve body 17 made of ceramic is mounted on the first valve box 15 so as to be movable up and down, and communicated with the first suction passage 18 communicating with the inside of the holding furnace 1 and the hot water supply conduit 8. The first discharge path 19 and the first intake / discharge path 20 communicating with the upper part of the first cylinder chamber 11 are formed so as to open to the first valve body moving space 21 formed at the lower end of the first valve box 15. Configured.

  The first discharge passage 19 is formed so as to open upward at the lower end of the first valve body moving space 21, and the upper valve box portion 22 above the first valve body moving space 21 is arranged in the holding furnace 1. A suction through hole 23 communicating with the inside of the first valve box 15 is formed so as to penetrate between the suction valve through hole 23 and the upper valve box portion 22 communicating with the suction through hole 23 and the first valve rod 16. The first suction passage 18 that opens to the upper portion of the first valve body moving space 21 is formed in the gap, and the first valve rod 16 slides with respect to the inner surface of the upper valve box portion 22 as the first valve rod 16 moves up and down. The first valve rod 16 is provided with an annular blocking member 24 that closes the gap between the first valve rod 16 and the upper valve box portion 22.

The first valve element 17 enters the upper valve box portion 22 as the first valve element 17 moves upward, and the upper valve element 25 that can open and close the first suction passage 18 and the first valve element 17 move downward. Accordingly, the first discharge passage 19 is annularly brought into contact with an upward receiving seat 26 formed around the opening of the first discharge passage 19 to the first valve body moving space 21, and the first discharge passage 19 can be opened and closed freely. 27, and by extending and retracting the valve operating pneumatic cylinder 28, as shown in FIGS. 1 and 2, the upper valve body 25 comes out of the upper valve box portion 22, and the inside of the holding furnace 1 becomes the first intake / exhaust passage 20. As shown in FIGS. 3 and 4, the lower valve body 27 is in contact with the receiving seat 26 in a ring shape and the communication between the hot water supply pipe 8 and the first intake / exhaust path 20 is blocked. The valve body 27 is separated from the receiving seat 26 to allow the hot water supply line 8 to communicate with the first intake / exhaust path 20 and the upper valve body 25. To a discharge position for blocking the communication between the holding furnace 1 in the first intake passage 20 enters the upper valve body portion 22 is provided with a first valve element 17 to freely move up and down operations.

  Then, as shown in FIG. 2, the molten metal 2 in the holding furnace 1 is moved to the first position by the downward movement operation of the piston 6 with the first valve body 17 moved to the suction position as shown in FIG. Operation for moving the piston 6 upward in a state where the first valve body 17 is moved to the discharge position as shown in FIG. 3 by being sucked into the first cylinder chamber 11 through the suction path 18 and the first suction / discharge path 20. As shown in FIG. 4, the molten metal 2 in the first cylinder chamber 11 is discharged to the hot water supply pipe 8 through the first intake / exhaust passage 20 and the first discharge passage 19 so as to supply hot water to the mold B1. is there.

  The melting furnace 3 is a partition plate 29 provided so as to sink in the molten metal 2 and is partitioned so as to communicate near the liquid level and near the bottom, regardless of whether the molten metal pump 7 supplies hot water to the mold B1 or not. In order to maintain the liquid surface C height of the molten metal 2 in 1 at a substantially constant height, the molten metal that has been degassed in the melting furnace 3 in conjunction with the hot water supply operation is passed through the communication line 4. A supply mechanism 30 capable of suction supply is provided in the holding furnace 1.

  The supply mechanism 30 causes the second cylinder chamber 12 to communicate with the communication pipe 4 and also disconnects the communication between the second cylinder chamber 12 and the holding furnace 1 so that the molten metal 2 in the melting furnace 3 is second. A suction state capable of being sucked into the cylinder chamber 12, the second cylinder chamber 12 is communicated with the holding furnace 1, and the communication with the communication conduit 4 of the second cylinder chamber 12 is interrupted, so that the second cylinder chamber The communication pipe 4 and the cylinder 5 are connected via a second valve mechanism 31 that can be switched to a discharge state in which the molten metal 2 in 12 can be discharged into the holding furnace 1.

  The second valve mechanism 31 fixes the cylindrical second valve box 32 across the furnace lid 10 and the lower part of the cylinder 5 so that the lower end of the second valve box 32 sinks into the molten metal 2, and the second valve rod 33 The integrally formed ceramic second valve body 34 is mounted on the second valve box 32 so as to be movable up and down, and the communication conduit 4 and the second discharge passage 35 communicating with the holding furnace 1 are provided. A second intake / exhaust passage 36 communicating with the lower portion of the second cylinder chamber 12 is formed so as to open to a second valve body moving space 37 formed at the lower end portion of the second valve box 32.

  The second discharge passage 35 is formed so as to open upward at the lower end of the second valve body movement space 37, and the communication pipe 4 is connected to the upper valve box portion 38 above the second valve body movement space 37. Then, a second suction passage 39 that opens to the upper part of the second valve body moving space 37 is formed by a gap between the upper valve box portion 38 and the second valve rod 33, and the second valve rod 33 can be moved up and down. Accordingly, the second valve stem 33 is provided with an annular closing member 40 that closes the gap between the second valve stem 33 and the upper valve box portion 38 while sliding with respect to the inner surface of the upper valve case portion 38.

  The second valve body 34 enters the upper valve box portion 38 as the second valve body 34 moves upward, and the upper valve body 41 that can open and close the second suction passage 39 and the second valve body 34 move downward. Accordingly, a lower valve body that is annularly brought into contact with an upward receiving seat 42 formed around the opening of the second discharge path 35 to the second valve body moving space 37 and that can freely open and close the second discharge path 35. 1 and 2, the upper valve body 41 enters the upper valve box portion 38 by the expansion and contraction operation of the valve operating pneumatic cylinder 44, and the communication pipe line 4 and the second intake / exhaust path 36 are , The lower valve body 43 is separated from the receiving seat 42 and communicates the holding furnace 1 with the second intake / exhaust passage 36, and the upper valve body 41 as shown in FIGS. Escapes from the upper valve box portion 38 to connect the communication conduit 4 to the second intake / exhaust passage 36 and the lower valve body 4 In the suction position to block the communication with the holding furnace 1 and brought into contact with the annular second intake passage 36 is receiving seat 42 is provided with a second valve element 34 to freely move up and down operations.

  Then, the piston 6 is moved upward in a state where the first valve body 17 is moved to the discharge position as shown in FIG. 3, and the molten metal 2 in the first cylinder chamber 11 is connected to the hot water supply pipe as shown in FIG. When discharging to the path 8 and supplying hot water to the mold B1, the piston 6 is moved upward with the second valve element 34 moved to the suction position as shown in FIG. 3, and as shown in FIG. The molten metal 2 in the melting furnace 3 is sucked into the second cylinder chamber 12 through the communication pipe 4 and through the second suction path 39 and the second suction / exhaust path 36, and as shown in FIG. When the piston 6 is moved downward with the 17 moved to the suction position and the molten metal 2 in the holding furnace 1 is sucked into the first cylinder chamber 11 as shown in FIG. 2, it is shown in FIG. As shown in FIG. 2, the piston 6 is moved downward with the second valve body 34 moved to the discharge position. As described above, the melt 2 of the second cylinder chamber 12, and are configured to be discharged into the holding furnace 1 through the second intake passage 36 and the second discharge passage 35.

[Other Embodiments]
1. The molten metal hot water supply apparatus according to the present invention is a molten metal in the melting furnace so that the level of the molten metal in the holding furnace can be maintained at a substantially constant height regardless of the hot water supply operation to the mold by the molten metal pump. A suction melt pump that can be sucked into the holding furnace is provided separately, and linked to the hot water supply operation of the melt pump for hot water supply, the suction melt pump is operated for suction, and the molten metal in the melting furnace is communicated. A supply mechanism capable of sucking and supplying into the holding furnace may be provided through the pipe line.
2. The molten metal hot water supply apparatus according to the present invention is a molten metal in the holding furnace so that the liquid level of the molten metal in the holding furnace can be maintained at a substantially constant height regardless of the hot water supply operation to the mold by the molten metal pump. A cylinder installed so as to sink inside is divided into a first cylinder chamber and a second cylinder chamber with a piston interposed therebetween, and each of the first cylinder chamber and the second cylinder chamber is divided into a hot water supply line and a communication pipe line. The molten metal sucked into the first cylinder chamber is connected to the mold through the hot water supply pipe, and the molten metal in the melting furnace passes through the communication pipe in the holding furnace. In connection with the hot water supply operation in which the molten metal sucked into the second cylinder chamber is sucked into the second cylinder chamber and supplied to the mold through the hot water supply pipe, the molten metal in the melting furnace passes through the communication pipe through the first cylinder. Supply machine for sucking and feeding indoors It may be each other provided.

Cross-sectional view of molten metal water heater Cross-sectional view of molten metal water heater Cross-sectional view of molten metal hot water supply system Cross-sectional view of molten metal water heater

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Holding furnace 2 Metal molten metal 3 Melting furnace 4 Communication pipe 5 Cylinder 6 Piston 7 Molten metal pump 8 Hot water supply pipe 11 1st cylinder chamber 12 2nd cylinder chamber 30 Supply mechanism B1 Mold C Liquid surface

Claims (2)

Installed a melt pump capable of sucking and discharging the molten metal by reciprocating the piston in the cylinder so that the cylinder sinks into the molten metal in the holding furnace,
A molten metal hot water supply device connected to the cylinder with a hot water supply pipe capable of supplying molten metal discharged from the cylinder to the mold,
One end side enters into the molten metal in the melting furnace, and the other end side is provided with a communication pipe that enters into the molten metal in the holding furnace,
Regardless of the hot water supply operation to the mold by the molten metal pump, in conjunction with the hot water supply operation, the liquid surface height of the molten metal in the holding furnace can be maintained at a substantially constant height. A molten metal hot water supply apparatus provided with a supply mechanism capable of sucking and supplying molten metal into the holding furnace through the communication pipe line. In configuring the supply mechanism,
The inside of the cylinder is divided into a first cylinder chamber and a second cylinder chamber with the piston interposed therebetween,
When the piston is moved to one side and the molten metal in the first cylinder chamber is discharged to the hot water supply pipe, the molten metal in the melting furnace is sucked into the second cylinder chamber through the communication pipe. And
When the molten metal in the holding furnace is sucked into the first cylinder chamber by moving the piston to the other side, the molten metal in the second cylinder chamber is discharged into the holding furnace. A hot water supply apparatus for molten metal according to claim 1.

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