JP2972526B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply furnace for melting a casting metal and feeding it to a mold or a sand mold.

[0002]

2. Description of the Related Art Metal casting by a high-pressure die-casting method is basically classified into two types according to a method of feeding molten metal into a mold, one of which is a cold chamber system and the other is of a cold chamber system. This is a method called a hot chamber method.

[0003] In the former cold chamber system, a holding furnace and a die casting machine are separate bodies, and the molten metal of the holding furnace is sent to the die casting machine by hand or by an automatic water heater.

In the latter hot chamber system, a die casting machine and a holding furnace are integrated into one, a gooseneck nozzle in the furnace communicates with a mold, and molten metal is injected into the mold.

[0005] The hot chamber system has several advantages over the cold chamber system. The best thing is the integrated hot water supply system, which makes it easy to automate and shortens the cycle time. Since the metal is not cooled before being sent to the mold in the hot chamber method, the casting pressure may be half that of the cold chamber method. In addition, since the fluidity at the time of feeding is good, it is possible to produce a part having a smaller thickness than the cold chamber method, a less blister, and a smoother surface.

[0006] By the way, the material is supplied to the holding furnace in both the conventional methods by directly charging the ingot or the return material, and the temperature is kept constant when the molten metal is used. It had been.

[0007]

As described above, when an ingot or a return material is directly charged, it takes a long time from the melting of the ingot to the use of the ingot. Particularly, in the case of magnesium die casting, when the ingot is charged into the molten metal. Risk of explosion.

[0008] Further, the conventional holding furnace has a large holding amount, so that a large amount of heat is dissipated, the cost for maintaining a constant temperature is high, and the holding time is long, so that sludge oxide is generated in the molten metal. There is a problem of doing.

Therefore, an object of the present invention is to reduce the holding amount of molten metal, to reduce the holding cost and prevent the generation of sludge oxide, and to supply the material to the molten metal in the molten state. Another object of the present invention is to provide a hot water supply furnace that can prevent the risk of explosion even in the case of magnesium die casting.

[0010]

According to a first aspect of the present invention, there is provided an automatic water heater installed in a furnace body, and a molten metal chamber partitioned by the automatic water heater inside the furnace body. And a holding chamber on the spout side is provided, and a stopper for stopping the charged material at a fixed position is provided inside a material charging cylinder provided in connection with the molten metal chamber, and stopped by a stopper on the outer periphery of the material charging cylinder. A heating coil for heating and melting a material to be heated is provided, and an automatic hot water supply machine in a hot water supply furnace in which the material is melted and supplied into a melting chamber is used.
The piston is built into the inside of the cylinder,
Communicates with the melt chamber at one rotation stop position and stops rotation at the other
It is formed with suction and discharge ports communicating with the holding chamber at the position.
The configuration adopts the following configuration.

[0011]

[0012]

[Function] Since the inside of the furnace body is separated by an automatic feeder into a molten metal chamber and a holding chamber, the volume of each can be set small, and the molten metal is not held for a long time. Can be eliminated.

Further, the ingot charged into the material charging cylinder is heated and melted by the heating coil while being stopped at the stopper, and supplied to the molten metal chamber in a molten state, so that there is no danger of explosion even in the case of magnesium die casting. .

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in the figure, an automatic water heater 2 is installed at the upper center of the furnace main body 1, and the inside of the furnace main body 1 is divided into a molten metal chamber 3 and a holding chamber 4 on the discharge side by the water heater 2. I have.

The furnace body 1 has a heat-resistant structure and is formed in a thin, generally flat cross-sectional shape. The temperature of the molten metal is set between the lower surface immediately below the automatic water heater 2 and the outer periphery of the molten metal chamber 3. Low-temperature coils 5 and 6 are provided for maintaining the coil, and a high-temperature coil 7 for heating the molten metal is provided on the outer periphery of the holding chamber.

A molten metal level detector 8 and a temperature detector 9 are provided in the molten metal chamber 3, and a temperature detector 10 is provided in the holding chamber 4. The upper part of the holding chamber 4 and the injection sleeve or the casting port 11 are connected. An antioxidant gas is supplied into the connected discharge passage 12.

The material of the furnace body 1 is selected from non-carbon materials such as a boiler steel plate when melting a magnesium alloy, and in the case of an aluminum alloy or an aluminum / zinc alloy,
It suffices to use ceramic so that only the material can be heated. Further, the volume of the holding chamber 4 can be set to about 1.5 times the casting amount for the die casting machine for high-speed heating.

[0019] The automatic hot water supply apparatus 2, in the cylindrical body 13 erected integrally or separately on the center portion of the top of the furnace body 1 walls, hollow bottom wall lower end a cylindrical shape of the conical 14 The cylinder 15 closed by the
The drive mechanism 26 is configured to apply a constant angle, for example, 180 ° forward / reverse rotation or intermittent rotation in the same direction, for example.

The piston 16 has an external thread of a rod 17 fixed in a fixed position so as to protrude upward.
By screwing the feed nut 18 forward and backward by the drive mechanism 19, the feed nut 18 is vertically moved by a constant stroke in the cylinder 15.

The bottom wall 14 of the cylinder 15 is provided with one suction / discharge port 20 at a position deviated outward from the center of rotation, and as shown in FIG. The discharge port 20 communicates with the inside of the molten metal chamber 3 via the port 3a, and communicates with the inside of the holding chamber 4 via the port 4a at the other rotation stop position, as shown in FIG.

A low-temperature coil 21 for heating the molten metal sucked into the cylinder 15 is provided on the outer periphery of the cylinder 15.
Is arranged.

At the outer end of the melt chamber 3 in the furnace body 1,
A material charging cylinder 22 that is inclined upward and outward is provided in a row, and a stopper 23 that stops the ingot A of the charged molten material at a fixed position is provided inside the charging cylinder 22.
And a fall prevention plate 24 for safety. In addition. The stopper 23 is set to be at a position higher than the surface of the molten metal chamber 3.

An antioxidant gas such as argon, nitrogen or SF6 is supplied to the inside of the material charging cylinder 22. Heating is performed on the outer periphery of the charging cylinder 22 to heat and melt the ingot A stopped by the stopper 23. A coil 25 is provided.

The heating coil 25 is a high-frequency induction heating, and heats and melts the ingot A, which is a material, efficiently in a short time, so that the material is supplied into the molten metal chamber 3 in a molten state. Become. In addition, other coils 5,
6, 7, and 21 are also high-frequency induction heatings.

The hot water supply furnace of the present invention has the above-described configuration, and the molten metal of a predetermined charge is held in the molten metal chamber 3 and the holding chamber 4 of the furnace main body 1 and the molten metal is placed in a mold of a die casting machine. As shown in FIG. 1, first, the cylinder 15 of the automatic water heater 2 is stopped at a position where the suction / discharge port 20 communicates with the molten metal chamber 3 via the port 3a, and in this state, the drive mechanism 19 To raise the piston 16.

When the piston 16 rises, the pressure in the cylinder 15 becomes negative, and the molten metal in the molten metal chamber 3 is sucked into the cylinder 15 by a certain amount.

Next, when the piston 16 is stopped at the ascent limit position, as shown in FIG. 2, the cylinder 15 in the drive mechanism 26 1
When the piston 16 is moved down by the drive mechanism 19 in this state, the molten metal sucked into the cylinder 15 is discharged from the suction / discharge port 20 by rotating the suction / discharge port 20 through the port 4a. The molten metal in the holding chamber 4 is pushed out of the holding chamber 4 into the mold by a fixed amount.

After the discharge, the cylinder 15 is rotated by 180 °, and the suction / discharge port 20 is communicated with the inside of the molten metal chamber 3 through the port 3a to prepare for the next discharge.

In response to the above-described discharge, an ingot A is charged into the material charging cylinder 22 and stopped by the stopper 23. The ingot A is heated and melted by the heating coil 25, and the material is introduced into the molten metal chamber 3. The supply is carried out in the molten state.

As described above, when the material is supplied into the molten metal chamber 3 in the molten state in the atmosphere of the antioxidant gas, in the case of magnesium alloy die casting, there is no danger of explosion at the time of material input. , Safety is improved.

[0032]

As described above, according to the present invention, the configuration as described above has the following effects.

(I) Since the molten metal chamber, the holding chamber and the automatic hot water supply device are integrated, the whole can be reduced in size and space saving, the capacity of the molten metal chamber and the holding chamber can be set small, the heating time is short, Low energy loss.

(II) Since the capacity of the molten metal chamber and the holding chamber can be reduced, the holding time of the molten metal is shortened, the generation of sludge oxide is reduced , and the automatic hot water supply device is rotated.
Install the piston inside the cylinder,
At one rotation stop position and communicate with the
Formed with suction and discharge ports communicating with the holding chamber at the stop position
Therefore, a fixed amount of the molten metal can be discharged to the mold.

(III) There is no danger of explosion even in the case of magnesium die-casting by employing the hot charge (supplied in a molten state) system.

(IV) Since the material is supplied in a molten state, there is no danger of explosion when the material is charged even in the case of magnesium die casting.

(V) The furnace body can be constructed without a crucible, and there is no need to replace the crucible.

(VI) Since the furnace body is crucible-less, there is no danger that the crucible will be broken and a secondary fire will occur.

(VII) Since the furnace body can be completely sealed,
Non-oxidizing hot water can be supplied when hot water is supplied into the sleeve.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a water heater of the present invention.

FIG. 2 is a longitudinal sectional view showing a state at the time of molten metal injection, in which a main part of the above is enlarged.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace main body 2 Automatic water heater 3 Melting chamber 4 Holding chamber 15 Cylinder 16 Piston 20 Suction / discharge port 22 Material charging cylinder 23 Stopper 25 Heating coil

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B22D 17/30 B22D 17/28 B22D 39/02 F27B 3/04 F27D 7/02

Claims (1)

(57) [Claims] 1. An automatic water heater is installed in a furnace main body, a molten metal chamber separated by the automatic water heater and a holding chamber on the side of a molten metal are provided inside the furnace main body, and a material input provided in connection with the molten metal chamber is provided. A stopper is provided inside the tube to stop the charged material at a fixed position, and a heating coil is provided on the outer periphery of the material charging tube to heat and melt the material stopped by the stopper. the hot water supply furnace was to be supplied to the room
In this case, the automatic hot water heater is mounted inside a rotating cylinder.
Incorporates a stone and stops one rotation at the end of the cylinder
Position and the holding chamber at the other rotation stop position.
It is characterized by being formed with a suction and discharge port that communicates
Water heater .