JPH086008Y2 - Powder production equipment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder producing apparatus for producing metal powder by a gas atomizing method, and more particularly to improvement of a molten metal nozzle for injecting molten metal melted in a melting crucible.

[0002]

2. Description of the Related Art As a device for producing a metal powder, a powder producing device using a gas atomizing method has been conventionally known. This apparatus stores a metal sample in a melting crucible, melts it by induction heating, and injects it into a lower injection chamber from a molten metal nozzle provided at the bottom of the melting crucible. At this time, an inert gas is jetted at a high speed from a gas jet nozzle provided at the lower end of the molten metal nozzle, and the molten metal jetted from the molten metal nozzle is made into metal powder by a gas atomizing method.

[0003]

However, according to the conventional powder manufacturing apparatus configured as described above, when the molten metal passes through the molten metal nozzle whose temperature is lower than that of this metal , the temperature is lowered, and the molten metal is melted. There was a problem that hot water could get stuck in the nozzle and could not be discharged. Further, the molten metal was clogged in the molten metal nozzle during gas atomization.

The present invention has been made in view of the above points, and provides a powder producing apparatus capable of preventing the temperature of molten metal from decreasing when passing through the molten metal nozzle and preventing the occurrence of clogging of molten metal in the molten metal nozzle. The purpose is to provide.

[0005]

In order to achieve the above object, in the powder producing apparatus according to claim 1, the metal sample in the melting crucible is a coil wound around the outer circumference of the melting crucible.
Dissolved by induction heating by, by injection by a gas atomizing method through the melt nozzle provided in the bottom of the melting crucible, the powder production apparatus for producing a metal powder,
An annular member made of graphite is attached to the outer periphery of the molten metal nozzle, and the annular member is induction-heated by the coil.
Therefore, it is characterized in that the molten metal nozzle is heated .

[0006]

[Function] According to the above configuration, the coil is induction-heated.
The molten metal nozzle is heated by the annular member
It is possible to prevent the temperature of the molten metal passing through the hot water nozzle from decreasing .

The coil for inductively heating the annular member is made of gold.
Since a coil is used to inductively heat the metal sample, the ring
It is necessary to arrange a coil for heating the cylindrical member around the molten metal nozzle.
It is not necessary, and as an annular member, it can be easily heated by induction.
Uses a minimum space because it uses graphite that is easy to process
Therefore, the annular member can be arranged around the molten metal nozzle. Obey
The entire length of the melt nozzle to heat the melt nozzle.
There is no need to make it compact and the device does not become large .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the powder producing apparatus of the present invention will be described below with reference to the drawings.

1 and 2 show the construction of an embodiment of the present invention. FIG. 2 shows a schematic structure of the powder producing apparatus according to the present embodiment. An upper injection chamber 2 is fixed on a gantry 1, and a lower injection chamber 3 is closely attached to the lower part of the upper injection chamber 2. There is. The lower injection chamber 3 is supported by a carriage 4, and a recovery pot 5 for recovering the manufactured powder is detachably attached to the lower end of the lower injection chamber 3. The upper injection chamber 2 is provided with a front view window 6, a hot water receiving mechanism 7, and an internal lighting device 8, and a melting portion 9 is attached to the upper portion.

A gas jet nozzle 10 described below is provided between the melting section 9 and the upper injection chamber 2, and a gas release valve 11 is connected to the upper injection chamber 2. A melting chamber 12 is provided above the melting unit 9, and the inside of the melting chamber 12 is evacuated by a vacuum exhaust device 13. In addition, in the melting chamber 12, a sample addition rod 14 for adding a metal sample and a shelving rod 15 are added.
And are attached. Reference numeral 16 shown in FIG. 1 is a surge tank, and reference numeral 17 is a compound meter.

FIG. 1 shows a detailed structure of the melting portion 9. A coil 22 for induction heating is wound around the outer cylinder 21 of the melting section 9, and a melting crucible 24 is placed on a bottom plate 23 inside the outer cylinder 21 via a carbon sheet 25. . In addition, outer cylinder 21
Of the melting crucible 24, the bottom plate 23, and the upper wall of the upper injection chamber 2 are concentrically provided with holes 24a, 23a and 23a, respectively. 2a is formed. The molten metal nozzle 27 is attached to the holes 24a and 23a, and the gas jet nozzle 10 is attached to the hole 2a.

On the upper end surface of the molten metal nozzle 27, there is formed an inverted conical recess 27a of about 90 degrees, and the cylinder 18 shown in FIG.
Thus, the molten metal nozzle 27 is opened and closed by the stopper 28 that is driven up and down via the rod 19. Also melt nozzle 27
The lower end of is fitted into the central hole of the gas jet nozzle 10, and a large number of unillustrated injection holes are concentrically formed on the outer periphery of the central hole of the gas jet nozzle 10. And plumbing
An inert gas such as Ar supplied through 29 passes through the jet nozzle 10 and is jetted from the jet holes. A gate valve 30 for opening and closing the central hole is provided on the lower surface of the central hole of the gas jet nozzle 10 via a packing 31.

In the powder producing apparatus constructed as described above, the melting crucible 24 containing the metal sample is placed in the melting section 9 evacuated by the vacuum evacuation device 13, and the melt nozzle 27 is It is closed by a stopper 28.
When a high frequency voltage is applied to the coil 22, the metal sample in the melting crucible 24 is induction-heated and melted. Next, the molten metal is pressurized in the melting chamber 12 so that the molten metal is discharged, and at the same time the gate valve 30 is opened, the molten metal stopper 28 is raised by driving the air cylinder 31, and the initial molten metal discharge setting is performed by the initial molten metal discharge timer. Supply inert gas from 10,
It is injected from the injection hole to the outer periphery of the lower end of the molten metal nozzle 27. As a result, the molten metal becomes a powder by the gas atomizing action, and is recovered in the recovery pot 5 through the injection chambers 2 and 3. The inert gas injected into the upper injection chamber 2 is released to the outside via the gas release valve 11.

On the outer periphery of the molten metal nozzle 27, an annular member 32, which is a feature of the present embodiment and is formed in an annular shape with graphite, is mounted. When a high frequency voltage is applied to the coil 22, induction heating is performed, and It is designed to keep 27 warm.

According to this embodiment, the annular member 32 mounted on the outer periphery of the molten metal nozzle 27 is induction-heated to keep the molten metal nozzle 27 warm and prevent the temperature of the molten metal passing through the molten metal nozzle 27 from decreasing. it can. As a result, it is possible to prevent the occurrence of clogging and blockage of the molten metal nozzle 27.

For induction heating of the metal sample in this case
With a configuration in which the annular member 32 is induction-heated by using the coil 22
In addition, it is easy to perform induction heating as the annular member 32.
By using graphite, the temperature is close to the temperature of the molten metal
The molten metal nozzle 27 can be heated. Also, using the coil 22
Since the annular member 32 is heated by induction,
Can be reduced and the device can be downsized. Also grain
To obtain a uniform metal powder with a small diameter, the melt nozzle 2
It is desirable that the nozzle hole of 7 has an extremely small diameter.
In order to prevent clogging of the molten metal,
It should be as short as possible, but according to this example,
Just attach a small annular member 32 to the outer circumference of the nozzle 27
Therefore, the molten metal can be melted without lengthening the molten metal nozzle 27.
It becomes possible to sufficiently heat the nozzle 27 .

[0017]

As described above, according to the powder producing apparatus of the present invention, the coil for inductively heating the metal sample is provided.
Induction heating of an annular member made of graphite using
Since the molten metal nozzle is heated by the shaped member,
The molten metal nozzle can be sufficiently heated to a temperature close to that of the hot water.
It Therefore, it is possible to prevent the temperature of the molten metal passing through the molten metal nozzle from decreasing and prevent the occurrence of clogging or blockage of molten metal in the molten metal nozzle. In addition, a coil for induction heating of a metal sample is used.
Induction heating of the annular member reduces the number of parts.
It is possible to reduce the size of the device and reduce the size of the device.
A small annular member made of graphite is placed around the hot water nozzle.
Since it is only necessary to provide it, increase the total length of the molten metal nozzle.
It is possible to sufficiently heat the molten metal nozzle without heating .

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of a melting section in an embodiment of the powder producing apparatus of the present invention.

FIG. 2 is a front view showing a schematic configuration of an embodiment of the powder producing apparatus of the present invention.

[Explanation of symbols]

 24 Melting crucible 27 Molten metal nozzle 32 Annular member

Claims (1)

[Scope of utility model registration request] [Claim 1, wherein the metal sample in the melting crucible dissolution Ruth
In a powder manufacturing apparatus that melts by induction heating with a coil wound around the outer circumference of a bowl and is sprayed by a gas atomizing method through a melt nozzle provided at the bottom of the melting crucible to produce a metal powder, the melt nozzle On the outer periphery of
Attach an annular member made of graphite, and use the coil
The molten metal nozzle is driven by the annular member that is induction-heated.
A powder production apparatus characterized by heating .