JP3334281B2 - Atomizing method and atomizing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for atomizing molten metal, which are suitable for producing metal / alloy powder for use in powder metallurgy and for treating slag generated in a blast furnace.

[0002]

2. Description of the Related Art Conventionally, metal and alloy powders for powder metallurgy are:
It has been manufactured by pulverizing a molten metal with an atomizing device equipped with various molten metal spraying means such as water spray, gas spray, and centrifugal spray. This atomizing device adopts a configuration in which a molten metal or alloy melted in an induction furnace or the like is poured into a tundish arranged at the top of the atomizing device, and is poured into the atomizing device from a pouring nozzle at the bottom of the tundish. Was.

[0003] In recent years, as one method of treating slag generated in a blast furnace, pulverization of slag using an atomizing device has been studied.

[0004]

However, the tundish pouring nozzle has a small pouring hole,
In particular, impurities such as Al ₂ O ₃ in the molten metal adhered thereto and caused nozzle clogging, so that the molten metal could not be continuously processed. Further, there is a problem that the tundish in which the nozzle blockage has occurred cannot be used as it is, and must be replaced or repaired, which increases the equipment cost. In particular, it has been extremely difficult to pulverize blast furnace slag containing a large amount of impurities causing such nozzle blockage.

Accordingly, an object of the present invention is to provide an atomizing method and an atomizing apparatus capable of solving such a problem caused by nozzle blockage and capable of pulverizing blast furnace slag.

[0006]

According to the present invention, there is provided an atomizing method for achieving the above object by tilting a container containing a molten metal to overflow the molten metal. , The molten metal is directly poured into the molten metal spraying means disposed in the atomizing device,
An atomizing method for powdering, wherein the powdering is performed while maintaining a constant pouring position relative to the molten metal spraying means while changing a horizontal relative distance between the container and the molten metal spraying means. .

According to the atomizing method of the present invention, the molten metal is poured from the upper portion of the container by overflow, so that the nozzle is not blocked as in the conventional atomizing method. Therefore, the molten metal can be continuously pulverized.
By the way, when pouring a container by inclining it, the falling path of the molten metal differs depending on the degree of inclination of the container and the amount of the molten metal.
However, in the method of the present invention, the pouring position relative to the molten metal spraying means is kept constant while changing the horizontal relative distance between the container and the molten metal spraying means. Therefore, it is possible to produce a powder having a uniform particle size.

In particular, as described in claim 2, claim 1
In the atomizing method described in the above, if the molten metal containing slag generated in a blast furnace is used as the molten metal and the slag is powdered, the molten metal containing a large amount of impurities such as oxides can be continuously formed. Can be powdered.

Further, according to the present invention, there is provided an atomizing device, comprising: a molten metal spraying means provided therein;
An atomizing device comprising a container containing a molten metal to be poured into the spraying means and a tilting means for tilting the container, wherein the container and the molten metal spraying means can be relatively moved in a horizontal direction. It is characterized by having horizontal moving means.

According to the atomizing apparatus, the following control may be performed by manual control or automatic control of the horizontal moving means. That is, if the molten metal overflows from the inclined container and flies far, the container is retracted, and if the molten metal falls only to the front, the container is advanced and the pouring position relative to the molten metal spraying means is set. The powdering may be carried out while maintaining a constant. For example, when controlling the tilting means so as to keep the inclination of the container constant, the horizontal moving means may be controlled so as to relatively advance the container with time. This makes it possible to pour the molten metal to a certain position in correspondence with the fact that the molten metal that has been flying far away when the container is tilted at this time gradually falls only to the near side as the remaining amount of molten metal decreases.

In order to perform such control, the horizontal moving means is constituted by a carriage on which the container is mounted to be tiltable and a rail on which the carriage runs. Preferably, the tilting means is placed on the cart. The carriage can be moved forward and backward on the rail according to the control state of the tilting means, and the pouring to a certain position can be easily performed. It is needless to say that the spraying means may be horizontally moved without being limited to this.

On the other hand, as described in claim 5, claim 3
Or, in the atomizing device according to 4, when the container is provided with a metal melting function, the molten metal can be maintained in an optimal melting state throughout the atomization,
Since the physical properties such as the viscosity of the molten metal can be kept constant from the start of pouring the molten metal until the pouring is completed, the effect of simplifying the control is high.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments will be described with reference to the drawings in order to further clarify the present invention. As shown in FIGS. 1 and 2, the atomizing device of the embodiment includes a water spray nozzle 1.
A water atomizer comprising: a rail 5 disposed horizontally beside the pouring port 3; a carriage 7 running on the rail 5; and a tiltably mounted on the carriage 7. The high-frequency induction furnace 9 includes a tilting mechanism 11 for tilting the high-frequency induction furnace 9.

The tilting mechanism 11 is supported by a large-diameter gear 15 pivotally supported by a shaft 13 at a predetermined lower position on both sides of the bogie 7 and a shaft 17 parallel to the shaft 13 of the large-diameter gear 15. A small-diameter gear 19 meshing with the large-diameter gear 15 and rotating, and a guide bar 23 projecting from a shaft 17 of the small-diameter gear 19 and externally fitted to a roller 21 provided at a lower rear portion of the high-frequency induction furnace 9 to serve as a guide. And The large-diameter gear 15 has its shaft 1
3 is rotated by driving the sprocket 25 attached to the chain 3 into a chain.

The tilting mechanism 11 is associated with a receiving member 29 provided in the middle of the front of the high-frequency induction furnace 9 for receiving a shaft 27 and a recess of a key-shaped member 31 provided at the front end of the upper end of the high-frequency induction furnace 9. And a support 33 which is supported from below. Axis 2
When the high-frequency induction furnace 9 is not so inclined (FIG. 1), the high-frequency induction furnace 9 and the receiving member 29 become the center of the tilt of the high-frequency induction furnace 9 (hereinafter, referred to as a first center). On the other hand, when the high-frequency induction furnace 9 is tilted to a certain degree or more (FIG. 2), the key-shaped member 31 and the support column 33 become the center of the tilt of the high-frequency induction furnace 9 (hereinafter, referred to as a second center).

The tilting mechanism 11 rotates the large-diameter gear 15 clockwise in the drawing to rotate the small-diameter gear 19 counterclockwise in the drawing, thereby flipping up the guide bar 23 and moving the rollers 21 through the guide bar 23. The high-frequency induction furnace 9 is tilted while sliding. In addition, when the high frequency induction furnace 9 is tilting around the first center, pouring is not performed.
Then, pouring is performed after starting to incline around the second center.

The high-frequency induction furnace 9, the tilting mechanism 11, and the bogie 7
Is, as shown in the block diagram of the drive / control system in FIG.
It is driven and controlled by a high-frequency oscillation circuit 41, a tilting motor 43, and a traveling motor 45 connected to the control device 40. Both the tilt motor 43 and the traveling motor 45 are mounted on or built into the carriage 7.

In FIG. 1 and FIG. 2, reference numeral 47 denotes a telescopic shield. In this control, as shown in the flowchart of FIG. 4, first, the tilt motor 43 and the traveling motor 45 are set to the initial control state (S1).
0), while moving the carriage 7 to the tip of the rail 5,
The high-frequency induction furnace 9 is set upright. Next, the metal or alloy material to be powderized by atomization is put into the high-frequency induction furnace 9 and the high-frequency oscillation circuit 41 is operated to perform melting (S20). When a predetermined melting state is reached, the tilting motor 4
3, the large-diameter gear 15 is slowly rotated clockwise at a constant speed to start tilt control (S30). Then, when the vehicle is tilted to a state where pouring is possible (S40), the energization of the traveling motor 45 is started, and the horizontal position control of the carriage 7 is executed (S50).

In this horizontal position control, as shown in FIG.
When the molten metal that overflows from the overflow port 51 formed with a U-groove at the upper end of the high-frequency induction furnace 9 is flying far, the bogie 7 is retracted, and conversely, when the molten metal falls only in front, the bogie 7 is advanced. Run to make it work. For example, a time chart as shown in FIG. 6 may be programmed. In this example of the program, first, the bogie 7 which has been advanced to the front end of the rail 5 is slowly retracted with the start of pouring, and when it is retracted to a certain position, the bogie 7 is kept close to that position until pouring of a predetermined amount is completed. The trolley is controlled to move the trolley 7 to the forward position again just before the end of pouring. This is because the molten metal has no momentum at the beginning of pouring, so it is easy to fall to the feet, and when it is tilted to some extent, the molten metal starts to fly relatively far and the molten metal starts to fly relatively far, and the pouring further advances and it is near the end This is because the remaining amount of the molten metal is small, and the overflow port 51 is oriented so as to be right below, so that the molten metal can easily fall to the feet again.

As described above, in this embodiment, the molten metal overflows from the overflow port 51 at the upper end of the high-frequency induction furnace 9 and is poured into the atomizing device, so that the molten metal contains impurities such as Al ₂ O _3. However, there is no problem that the nozzle of the tundish is clogged as in the conventional atomizing apparatus. Therefore, a large amount of molten metal can be continuously atomized. Further, particularly, hot metal containing a large amount of slag from the blast furnace is taken out and the high-frequency induction furnace 9 is taken out.
If the slag is treated as described above, since the nozzle is not clogged, the slag can be easily powdered. The powdered slag can be used as a shot material or the like.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention. Absent. For example, instead of using a motor or a gear, a hydraulic cylinder or the like may be used as the tilting mechanism 11. In the embodiment, the molten metal container is moved forward and backward. However, in order to move the water spray nozzle horizontally, the water spray nozzle may be horizontally moved to perform the same horizontal position control as described above. Absent. Further, the present invention is not limited to water atomization, but may be applied to an apparatus for powdering by gas atomization, centrifugal atomization, or the like. In the horizontal movement, the worker may manually control the movement of the bogie while checking the pouring point.

[0022]

As described above, according to the atomizing method and the atomizing apparatus of the present invention, the molten metal can be continuously pulverized without causing nozzle blockage as in the conventional method and apparatus. . In particular, according to the atomizing method of claim 2, it becomes possible to pulverize and process the blast furnace slag. According to the atomizing device of the fifth aspect, since the container has a metal melting function, the container is suitable for slowly processing a large amount of molten metal, and can be tilted with high precision.
Horizontal movement control becomes possible.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an apparatus according to an embodiment.

FIG. 2 is a schematic configuration diagram of an apparatus according to an embodiment.

FIG. 3 is a control system diagram of the apparatus of the embodiment.

FIG. 4 is a flowchart of a control process in the embodiment.

FIG. 5 is an explanatory diagram showing a basic concept of tilting / horizontal movement control in the embodiment.

FIG. 6 is a time chart of a control example of tilt / horizontal movement control in the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water spray nozzle, 3 ... Pouring port, 5 ... Rail, 7 ... Dolly, 9 ... High frequency induction furnace, 11 ...
Tilting mechanism, 15: large-diameter gear, 19: small-diameter gear,
21: roller, 23: guide bar, 40:
Control device, 41: high-frequency oscillation circuit, 43: tilting motor, 45: traveling motor, 51: overflow port.

Claims (5)

(57) [Claims] 1. An atomizing method for injecting a molten metal directly into molten metal spraying means provided in an atomizing device by tilting a container containing the molten metal to overflow the molten metal, and pulverizing the molten metal. An atomizing method characterized in that powdering is performed while changing the horizontal relative distance between the container and the molten metal spraying means and keeping the pouring position relative to the molten metal spraying means constant. 2. The atomizing method according to claim 1, wherein the slag is pulverized using a molten metal containing slag generated in a blast furnace as the molten metal. 3. An atomizing apparatus comprising: a molten metal spraying means disposed therein; a container containing a molten metal to be poured into the spraying means; and a tilting means for tilting the container. An atomizing device comprising a horizontal moving means capable of relatively moving a container and a molten metal spraying means in a horizontal direction. 4. The atomizing apparatus according to claim 3, wherein the horizontal moving means comprises a carriage on which the container is mounted so as to be tiltable, and a rail on which the carriage runs, and wherein the tilting means includes the bogie. An atomizing device, wherein the atomizing device is mounted on a device. 5. The atomizing device according to claim 3, wherein the container has a metal melting function.