JPH0468362B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method and apparatus for stably injecting a large amount of molten metal, such as a spray medium for molten metal when manufacturing metal powder by an atomization method. The present invention relates to a surface injection method and apparatus. More specifically, the present invention relates to a molten metal injection method and apparatus that can stably inject molten metal supplied continuously or intermittently onto the surface of an injected atomizing medium.

(Conventional technology) To produce metal powder by the atomization method,
Inject molten metal onto the surface of the injected spray medium. Fifth
The figure shows an example of an apparatus for producing metal powder using a conventional atomization method.

Molten metal 2 prepared in an electric furnace or the like is stored in a container 1 having a stopper (not shown). After the molten metal 2 has been placed in the container 1, the stopper is opened and the molten metal 2 is injected from the injection nozzle 3 into the atomizing device as an injection stream 21. The atomizing nozzle 4 of the atomizing device injects a spraying medium to form a spraying medium surface 41, and the injection stream 21 from the pouring nozzle 3 falls onto the spraying medium surface 41, becomes powder, and is mixed with the spraying medium. Atomization tank 5
be accommodated in.

(Problems to be Solved by the Invention) As described above, in the conventional apparatus, after the molten metal 2 is placed in the container 1, the stopper is opened to pour the molten metal. While the molten metal 2 that is continuously or intermittently supplied is accommodated in the container 1, the molten metal 2 is
cannot be injected. This is due to the following reason.

The conventional container 1 has a one-chamber structure. For this reason,
If the molten metal 2 is poured from the pouring nozzle 3 while being supplied, the injection flow 21 will be disturbed due to the turbulent flow of the molten metal 2 in the container 1. That is, container 1
The turbulence in the container 1 caused by the molten metal 2 being poured into the container 1 extends to the vicinity of the pouring nozzle 3, causing the injection flow 21
Disturbances such as shaking, unraveling, and twisting occur. The fluctuation of the injection flow 21 means that the injection flow 21 is
This is a phenomenon in which the injected flow 21 is deviated from vertically downward to one side and falls, and the scattering is a phenomenon in which the injected flow 21 is split and falls in the form of many particles. Further, twisting is a phenomenon in which the injected flow 21 becomes slightly flattened and falls while swirling in a spiral shape.

Injection stream 2 of molten metal 2 falling onto the spray medium surface 41
If turbulence (shaking, unraveling, twisting, etc.) occurs in the atomizing nozzle 4, the injected flow 21 will not be atomized and will solidify within the atomizing nozzle 4, thereby blocking the space within the nozzle. That is, atomize nozzle 4
Blocking occurs. If blocking occurs, interruption of atomization is inevitable.

Therefore, in the conventional injection container 1, the molten metal 2
If molten metal is poured at the same time while being supplied with molten metal, blocking will inevitably occur. Therefore, such simultaneous pouring was impossible.

If the amount of molten metal 2 processed at one time is a small amount of at most 100 kg or several tons as in the past,
Even if the process of supplying the molten metal 2 to the container 1 and the process of atomizing are performed separately, no major problem arises. However, when the scale of production is expanded and a large amount of molten metal 2 weighing several tens of tons is to be processed in one go, it is inefficient to carry out both processes separately. Therefore, it is necessary to continuously or intermittently receive the molten metal 2 into the container 1 and simultaneously pour the metal into the atomizing device.

Therefore, an object of the present invention is to maintain the injection flow 21 even when the molten metal 2 is supplied and simultaneously poured.
An object of the present invention is to provide an injection method and device that does not cause disturbances in the injection process.

(Means for Solving the Problems) As a result of repeated research to achieve the above-mentioned object, the present inventor separated the container into three chambers, and sequentially delivered the supplied molten metal to these three chambers in a predetermined manner. We came up with the idea of calming the flow by guiding it through a channel.

That is, the method for injecting molten metal of the present invention is a method for stably injecting molten metal that is continuously or intermittently supplied, and includes: (a) temporarily or intermittently injecting molten metal that is continuously or intermittently supplied; (b) directing the molten metal contained in the first chamber as a flow in a fixed direction into the second chamber and causing it to collide with the wall surface of the second chamber to change the direction of the flow of the molten metal; (c) The flow of the molten metal that has been decelerated and rectified in the second chamber is further guided to the third chamber and calmed down, and then the flow of the molten metal is (d) pouring the molten metal contained in the first chamber in the process of (b) above into an immersion hole or a narrow gap that communicates the first chamber with the second chamber; (e) In the step (c) above, the entrance of the flow path that leads the molten metal from the second chamber to the third chamber is a gap that is completely open to the surface of the molten metal. , is characterized by.

Further, the molten metal injection device according to the present invention includes:
An apparatus for stably injecting molten metal that is continuously or intermittently supplied, comprising: (a) a first chamber that temporarily accommodates the molten metal that is continuously or intermittently supplied; (c) a second chamber comprising a communication hole or a narrow gap communicating from the first chamber to the second chamber; and (c) a wall surface that faces the flow of molten metal flowing from the first chamber and reverses the direction of the flow of the molten metal. (d) A third chamber is provided with a pouring nozzle for injecting the molten metal flowing from the second chamber, and is connected to the second chamber by a gap that is completely open to the surface of the molten metal. .

If the present invention is used when manufacturing metal powder by the atomization method by injecting molten metal onto the surface formed by the injected atomizing medium, it can have a great effect on increasing the efficiency of mass production, but it is limited to this. It's not a thing. For example, it can be equally applied to cases where stable injection of a large amount of molten metal is required, such as in the case of continuous casting.

Note that in the above, it is preferable that the molten metal be guided through an immersion hole that opens in a fixed direction from the first chamber to the second chamber. However, instead of dipping holes, narrow gaps may also be used. Further, from the second chamber to the third chamber, a gap provided at one end of the side wall of the second chamber may be used as a flow path. At this time, it is preferable to bend the end of the side wall into a dogleg shape so that the cross section of the wall surface at the entrance of the flow path from the second chamber to the third chamber has this shape. Further, it is preferable to avoid placing the pouring nozzle very close to the corner of the third chamber. This is to prevent twisting of the injection flow due to swirling flow.

(Function) Molten metal is guided from the first chamber to the second chamber in the form of a jet flowing in a fixed direction through an immersion hole or a narrow gap. This jet of molten metal collides with a wall provided in the second chamber facing in this direction and is reversed. As a result, the flow of molten metal that has been decelerated and rectified is
It is led to the third chamber through a gap forming a flow path between the chamber and the third chamber. If the wall surface of the entrance of the gap forming the flow path from the second chamber to the third chamber is formed into a dogleg shape, the flow of the molten metal can be further calmed by the swirling current generated thereby.

(Example) Next, an example of the present invention will be described in detail with reference to the accompanying drawings. Through this description, the details of the invention will become clearer.

1 and 2 show a first embodiment of the device of the present invention, FIG. 1 is a plan view of the device, and FIG. 2 is a view of the device taken along the chain line - in FIG. FIG.

Molten metal 2 continuously or intermittently supplied from ladle 10 is accommodated in first chamber 11 . Therefore, the flow of molten metal in the first chamber 11 is extremely turbulent. An immersion hole 6 is bored in the wall separating the first chamber 11 and the second chamber 12, so that the first chamber 11 and the second chamber 12 communicate with each other. The molten metal that has passed through the immersion hole 6 flows into the second chamber 12 as a jet stream. As a result, the flow in the first chamber 11 that has a high flow velocity, is highly turbulent, and has large temporal changes becomes a stable jet with a high flow velocity but a constant direction. Immersion hole 6
Alternatively, a narrow vertical gap may be provided in the wall between the first chamber 11 and the second chamber 12, but the immersion hole 6 provides a more stable jet flow.

The jet of molten metal that has passed through the immersion hole 6 collides with the wall 12a of the second chamber 12 facing the immersion hole, and is reversed while spreading. The flow of molten metal that has been reversed, decelerated, and rectified by the wall 12a hits the wall 12b opposite to the wall 12a and is guided to the third chamber 13.

The flow path connecting the second chamber 12 and the third chamber 13 is
Due to the gap provided at the wall end 7 of the wall 12c that separates the chamber 12 and the third chamber 13, this gap is completely open to the molten metal surface, as is clear from FIGS. 1 and 2. It is in between. This wall edge 7
is bent in a dogleg shape, and from the second chamber 12 to the third chamber 1
The cross section of the side wall of the inlet of the flow path to No. 3 has this shape. As a result, a vortex is generated at the inlet of the flow path (see FIG. 1). The generation of this vortex has the effect of further calming the flow of molten metal from the second chamber 12 to the third chamber 13.

The molten metal that has flowed into the third chamber 13 in this way is
The flow circulates in the third chamber 13 as a gentle flow with almost no turbulence, and the injected flow 2 flows from the pouring nozzle 3.
1 and falls onto the spray medium surface (not shown) created by the atomizing nozzle. Therefore, injection flow 2
1. Disturbances such as shaking, unraveling, twisting, etc. do not occur.

It is important to avoid placing the pouring nozzle 3 near the corner of the third chamber 13, especially on the bisector of the corner (indicated by a broken line in FIG. 1). This is because if the pouring nozzle 3 is provided at this position, a swirling flow is generated in the molten metal, and the pouring flow 21 is likely to be twisted.

Furthermore, at the start of supplying molten metal 2 from ladle 10, stopper 8 is lowered to close pouring nozzle 3, and when the molten metal in container 1 reaches a predetermined level, stopper 8 is raised to pour the molten metal. Assume that nozzle 3 is opened. This is because the injection flow 21 cannot be stabilized until the molten metal level in the container 1 reaches a predetermined value.

FIG. 3 is a plan view of another example device in which a third chamber 13 is arranged separately on both sides of the second chamber 12.
The container 1 has a first chamber 11, a second chamber 12, and a third chamber 13.
The first chamber 11 and the second chamber 12 are connected to the immersion hole 6.
Communicate with. The flow path from the second chamber 12 to the third chamber 13 is completely open to the molten metal surface, and the wall end 7 of the wall 12c of the second chamber 12 is bent in a dogleg shape. The cross section of the side wall has this shape. Note that the broken line in the figure indicates the bisector of the corner of the third chamber 13. It is preferable that the pouring nozzle 3 is placed avoiding the vicinity of these areas.

FIG. 4 is a plan view of another example device having a structure in which the third chamber 13 surrounds the second chamber 12. Since the structure is the same as that of the above embodiment except that three pouring nozzles 3 are provided, detailed explanation will be omitted.

Although the present invention has been described above with reference to Examples, the above-mentioned Examples merely illustrate the present invention and do not limit the present invention.

(Effects of the Invention) According to the present invention, even if the molten metal 2 that is continuously or intermittently supplied is accommodated in the container 1 and simultaneously injected into the atomizing device or the like in the next step, the injection flow 21 is There will be no disturbance. When a conventional single-chamber container is used, if molten metal is supplied to the container and poured at the same time, turbulence will inevitably occur in the injection flow 21.

In order to confirm the effects of the present invention, a water model experiment was conducted using a half-sized model of the apparatus shown in FIGS. 1 and 2. Lower the stopper 8, pour water from the ladle 10, and when the water reaches the predetermined level, raise the stopper 8 and pour water into the ladle 10.
Open and start injection. After that, water continued to be supplied from the ladle 10, but the turbulence of the water flow in the first chamber 11 did not affect the third chamber 13, and the water was swayed by the injection flow 21 from the pouring nozzle 3, dispersing, No disturbances such as twisting occurred. Further, even when water was intermittently supplied from the ladle 10 to the first chamber 11, the injection flow 21 remained completely stable and no disturbance was observed.

Next, the device shown in FIGS. 1 and 2 (actual tundish) was manufactured from refractory material and used for actual atomization. The amount of molten metal (molten steel) processed at one time was 30 tons, and 70 operations were conducted. Depending on the manufacturing conditions, the processing time could exceed 2 hours, but the injection flow 21 was extremely good and no blocking occurred due to its turbulence.

As described above, according to the present invention, the molten metal is stored in the container 1.
This makes it possible to receive hot water while at the same time stably pouring hot water. Therefore, a large amount of molten metal can be processed continuously, which has a significant effect in shortening working time and increasing efficiency, especially when a large amount is to be processed.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the device of the present invention, and FIG.
3 is a plan view of another embodiment of the device of the present invention; FIG. 4 is a plan view of still another embodiment of the device;
and FIG. 5 is a partially cutaway elevational view of a conventional metal powder production apparatus using the atomization method. 1: Container, 2: Molten metal, 3: Pouring nozzle,
4: Atomizing nozzle, 5: Atomizing tank, 6:
Immersion hole, 7: wall end, 8: stopper, 10: ladle,
11: 1st room, 12: 2nd room, 13: 3rd room, 2
1: Injection flow.

Claims (1)

[Claims] 1. A method for stably injecting molten metal supplied continuously or intermittently, comprising: (a) temporarily injecting molten metal supplied continuously or intermittently into a first chamber; (b) The molten metal accommodated in the first chamber is guided as a flow in a fixed direction into the second chamber and collided with the wall surface of the second chamber, and the direction of the flow of the molten metal is reversed and the molten metal is (c) After the flow of molten metal that has been decelerated and rectified in the second chamber is further guided to the third chamber and calmed down, it is poured from the pouring nozzle provided in the third chamber. (d) Injecting the molten metal contained in the first chamber in the step (b) above into the second chamber through an immersion hole or a narrow gap communicating the first chamber and the second chamber. (e) In the process of (C) above, the entrance of the channel for guiding the molten metal from the second chamber to the third chamber is completely open to the surface of the molten metal. Method of pouring molten metal. 2. In the step (e) above, the wall defining the entrance of the channel that guides the molten metal from the second chamber to the third chamber is bent into a dogleg shape to create a vortex in the molten metal flowing through the channel. A method for injecting molten metal according to claim 1, characterized in that: 3. The pouring nozzle is provided on the bottom surface of the third chamber at a position away from the corner portion of the third chamber.
Method of pouring molten metal as described in Section 1. 4. A device for stably injecting molten metal that is continuously or intermittently supplied, which includes: (a) a first chamber that temporarily accommodates the molten metal that is continuously or intermittently supplied; (b) (c) a second chamber having a wall surface that faces the flow of molten metal flowing in from the first chamber and reverses the direction of the flow of the molten metal; and (d) a third chamber that is connected to the second chamber by a gap that is completely open to the surface of the molten metal and that is equipped with a pouring nozzle for injecting the molten metal that has flowed from the second chamber. Molten metal injection equipment. 5. The molten metal injection device according to claim 4, wherein the wall surface defining the flow path connecting the second chamber and the third chamber has a dogleg-shaped cross-sectional shape. 6. The molten metal injection device according to any one of claims 4 to 5, wherein the third chamber includes a plurality of pouring nozzles.