TW201910023A - Metal powder manufacturing apparatus and method for producing metal powder - Google Patents

Abstract

The present invention provides a manufacturing device of metal powder capable of manufacturing high-quality metal powder and a method of manufacturing metal powder using the same. The metal powder manufacturing device (10) includes: a molten metal supply portion (20) that ejects molten metal, a cylinder body (32) that is disposed below the molten metal supply portion (20), and a coolant layer forming portion (38) for forming a coolant flow along the inner circumferential surface of the cylinder body. The coolant cools the molten metal ejected from the molten metal supply portion (20). The coolant layer forming portion (38) has a front end bent portion (38a) for stabilizing the coolant flowing toward the inner side of the radial direction from the inner circumferential surface (33) and ejecting the coolant toward the flowing direction along the inner circumferential surface (33) of the cylinder body (32).

Description

Metal powder manufacturing device and metal powder manufacturing method

The invention relates to a metal powder manufacturing device and a metal powder manufacturing method.

For example, as shown in Patent Document 1, a metal powder manufacturing apparatus for manufacturing metal powder using a so-called gas atomization method and a manufacturing method using the apparatus are known. The conventional device has a molten metal supply container that ejects molten metal, a cylindrical body provided below the molten metal supply container, and a cooling liquid layer forming portion that forms a flow of cooling liquid along the inner peripheral surface of the cylindrical body. The cooling liquid layer forming unit cools the molten metal ejected from the molten metal supply unit.

The cooling liquid layer forming portion sprays the cooling liquid in a tangential direction of the inner peripheral surface of the cooling cylinder, and flows down while rotating the cooling liquid along the inner surface of the cooling container, thereby forming a cooling liquid layer. It is expected that by using the cooling liquid layer, the liquid droplets can be rapidly cooled to produce highly functional metal powder.

However, in the conventional device, even if the cooling liquid is sprayed in the tangential direction of the inner circumferential surface of the cooling cylinder, the cooling liquid is reflected on the inner circumferential surface of the cylinder, and a flow from the inner circumferential surface toward the inner side in the radial direction occurs. Become turbulent. Therefore, in the conventional device, there is a technical problem that it is difficult to form a uniform thickness of the cooling liquid layer along the inner peripheral surface of the cylinder, and it is difficult to produce homogeneous (uniform particle size, crystal state, shape, etc.) metal powder. In particular, when the flow rate of the cooling liquid is increased, or the pressure of the pump that extrudes the cooling liquid is increased to increase the speed of the cooling liquid, this tendency becomes stronger.

[Prior Art Literature]

[Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 11-80812

[Technical problems to be solved by the invention]

The present invention was developed in view of this actual situation, and its object is to provide a metal powder manufacturing apparatus capable of manufacturing high-quality metal powder and a metal powder manufacturing method using the metal powder manufacturing apparatus.

[Proposal for solving technical problems]

In order to achieve the above object, the present invention provides a metal powder manufacturing apparatus, characterized by comprising: a molten metal supply part that ejects molten metal; a cylinder body that is provided below the molten metal supply part; and a coolant layer formation A cooling fluid flow is formed along the inner peripheral surface of the cylindrical body, the cooling liquid flow cools the molten metal ejected from the molten metal supply portion, and the cooling liquid layer forming portion is above the cylindrical body It has a front-end bent portion for forming a stable flow inside the cylinder.

The present invention provides a method for manufacturing a metal powder, comprising: a step of forming a flow of a cooling liquid along an inner peripheral surface of a cylinder provided below a molten metal supply portion; and supplying molten metal from the molten metal The step of ejecting the liquid into the cooling liquid flow is to eject the above-mentioned inner peripheral surface of the cylindrical body from the steady flow forming portion provided on the inner side of the cylindrical body at the upper part of the cylindrical body along the inner peripheral surface of the cylindrical body Coolant.

In the metal powder manufacturing apparatus and the metal powder manufacturing method of the present invention, a tip bending portion is provided on the upstream side of the position where the molten metal ejected from the molten metal supply portion contacts the cooling liquid. At the tip bending portion, the cooling liquid from the inner circumferential surface toward the radially inner side is stably fluidized, and the cooling liquid is ejected in a direction flowing along the inner circumferential surface of the cylindrical body. Therefore, even if the flow rate of the cooling liquid is increased or the speed of the cooling liquid is increased, it is possible to easily form a uniform thickness of the cooling liquid layer along the inner peripheral surface of the cylinder and produce high-quality metal powder.

Preferably, the inner diameter of the tip bending portion is smaller than the inner diameter of the inner peripheral surface of the cylinder, and the gap between the tip bending portion and the inner peripheral surface is configured for the cooling liquid to The cooling liquid ejecting portion flowing on the inner peripheral surface. With this configuration, even when the flow rate of the cooling liquid or the speed of the cooling liquid is increased, it is easy to form a cooling liquid layer of a uniform thickness along the inner circumferential surface of the cylinder.

The inner diameter of the tip bending portion may be configured so that the shape of the lower end taper toward the axial direction of the tip bending portion becomes larger.

The tip bending portion may be tapered toward the lower end of the tip bending portion in the axial direction. By inclining the tip bending portion toward the lower end in the axial direction, the force in the direction of pressing the cooling liquid toward the inner peripheral surface acts to easily form a uniform thickness of the cooling liquid layer along the inner peripheral surface of the cylinder.

Preferably, the inner frame provided at the lower end of the front-end bending portion is attached above the cylindrical body. With this configuration, it is easy to arrange the tip bending portion on the upstream side of the position where the molten metal ejected from the molten metal supply portion comes into contact with the cooling liquid.

Preferably, the cooling liquid layer forming portion has a spiral liquid flow forming portion that makes the cooling liquid impinge on the inner frame in a spiral shape. The spiral liquid flow forming portion is formed by attaching, for example, a nozzle that sprays a cooling liquid in a tangential direction of the inner circumferential surface of the cylinder to the cylinder. By mounting the inner frame inside the position where the cooling liquid is discharged from the spiral flow forming portion in the tangential direction of the inner circumferential surface of the cylinder, it is easy to form a coolant layer of a uniform thickness along the inner circumferential surface of the cylinder.

It is preferable that the tip end of the tip bending portion is provided with a folded end portion that forms a predetermined gap with the inner frame. With the folded end portion, the flow of the cooling liquid flowing from the cooling liquid ejecting portion between the front-end bent portion and the inner peripheral surface is further stabilized, and it is easy to form a uniform thickness of the cooling liquid along the inner peripheral surface of the cylinder Floor.

More specifically, the present invention provides a metal powder manufacturing apparatus, characterized by comprising: a molten metal supply unit that ejects molten metal; a cylinder body that is provided below the molten metal supply unit; and a coolant layer forming unit , Which forms a flow of cooling liquid along the inner peripheral surface of the cylindrical body, the cooling liquid flow cools the molten metal ejected from the molten metal supply portion, and the cooling liquid layer forming portion has an axis on the cylindrical body An inner frame provided in the upper part in the center direction, the inner frame having an inner diameter smaller than the inner diameter of the inner peripheral surface of the cylindrical body, and a lower end portion along the axis of the inner frame is provided with a radial direction from the inner frame An outwardly protruding front end bent portion, the inner diameter of the front end bent portion is smaller than the inner diameter of the inner peripheral surface of the cylindrical body, and the gap between the front end bent portion and the inner peripheral surface is configured to make the coolant The coolant discharge portion flowing along the inner peripheral surface is formed on the inner diameter side of the coolant discharge portion at the upper portion of the cylindrical body by the inner frame and the front-end bending portion at the upper portion of the cylindrical body. The space portion for forming a stable flow, the coolant flowing inward in the radial direction collides with the inner frame, and the flow toward the lower side along the axis is restricted at the bent portion at the front end, and the coolant is formed in the stable flow The space portion temporarily stabilizes the turbulent flow, and is ejected from the coolant ejection portion along the inner circumferential surface of the cylinder.

Preferably, the front end bending portion is inclined toward the lower end of the front end bending portion in the axial direction at a predetermined angle with respect to the inner frame to taper the cooling liquid against the inner peripheral surface of the cylindrical body The direction of force.

Preferably, nozzles are connected at a plurality of locations in the circumferential direction at the upper part in the axial direction of the cylindrical body, so that the cooling liquid strikes the inner frame in a spiral shape.

Preferably, a tip end for forming a predetermined gap with the inner frame is provided at the tip end of the tip bending portion.

More specifically, the present invention provides a method of manufacturing a metal powder, which includes the steps of forming a flow of a cooling liquid along the inner peripheral surface of a cylinder provided below a molten metal supply portion; and removing molten metal from The step of ejecting the molten metal supply part into the flow of the cooling liquid, the method for producing metal powder using the metal powder production device described in any one of the above, from the upper part of the cylindrical body to the inner side of the cylindrical body The space portion for forming a stable flow is provided to eject the cooling liquid along the inner peripheral surface of the cylindrical body through a gap between the front-end bent portion serving as the cooling liquid ejecting portion and the inner peripheral surface.

Hereinafter, the present invention will be described based on the embodiments shown in the drawings.

First embodiment

As shown in FIG. 1, a metal powder manufacturing apparatus 10 according to an embodiment of the present invention is an apparatus for powdering molten metal 21 by an atomization method (gas atomization method) to obtain metal powder composed of a plurality of metal particles. . This device 10 includes a molten metal supply unit 20 and a cooling unit 30 disposed below the metal supply unit 20 in the vertical direction. In the drawings, the vertical direction is the direction along the Z axis.

The molten metal supply unit 20 has a heat-resistant container 22 that accommodates the molten metal 21. A heating coil 24 is arranged on the outer periphery of the heat-resistant container 22 to heat and maintain the molten metal 21 contained in the container 22 in a molten state. A discharge port 23 is formed at the bottom of the container 22, and the molten metal 21 is discharged from the discharge port 23 toward the inner peripheral surface 33 of the cylindrical body 32 constituting the cooling unit 30 as the dripped molten metal 21 a.

A gas injection nozzle 26 is arranged on the outer peripheral portion of the outer bottom wall of the container 22 so as to surround the discharge port 23. The gas injection nozzle 26 is provided with a gas injection port 27. High-pressure gas is injected from the gas injection port 27 toward the dropped molten metal 21a ejected from the injection port 23. The high-pressure gas is injected obliquely downward from the entire circumference of the molten metal ejected from the ejection port 23, the molten metal 21 a is dropped into a plurality of droplets, and travels toward the inner circumferential surface of the cylinder 32 along the flow of the gas.

The molten metal 21 may contain any element. For example, at least any kind of metal containing Ti, Fe, Si, B, Cr, P, Cu, Nb (niobium), and Zr can be used. These elements have high activity, and the molten metal 21 containing these elements is easily oxidized to form an oxide film by short-term contact with air, and it is difficult to miniaturize. As described above, the metal powder manufacturing apparatus 10 uses inert gas as the gas injected from the gas injection port 27 of the gas injection nozzle 26, so that even the molten metal 21 that is easily oxidized can be easily powdered.

The gas injected from the gas injection port 27 is preferably an inert gas such as nitrogen, argon, or helium, or a reducing gas such as an ammonia decomposition gas. However, if the molten metal 21 is difficult to oxidize, it may be air. .

In this embodiment, the axis O of the cylinder 32 is inclined at a predetermined angle θ1 with respect to the vertical line Z. The predetermined angle θ1 is not particularly limited, but is preferably 5 to 45 degrees. By setting it as such an angle range, the dripped molten metal 21a from the ejection port 23 can be easily ejected toward the coolant layer 50 formed on the inner peripheral surface 33 of the cylindrical body 32.

The dripping molten metal 51 sprayed onto the cooling liquid layer 50 collides with the cooling liquid layer 50, is further divided and refined, and is cooled and solidified to become a solid metal powder. A discharge portion 34 is provided below the axis O of the cylinder 32, and the metal powder contained in the coolant layer 50 can be discharged to the outside together with the coolant. The metal powder discharged together with the cooling liquid is separated from the cooling liquid in an external storage tank or the like and taken out. In addition, the cooling liquid is not particularly limited, and cooling water can be used.

In the present embodiment, the inner frame 38 is provided at the upper portion of the cylindrical body 32 in the direction of the axis O. The inner frame 38 is attached to the upper portion of the cylindrical body 32 using an attachment flange 39 integrally formed therewith. The mounting method of the inner frame 38 is not particularly limited, and may be integrally formed with the cylinder 32. The inner frame 38 has an inner diameter smaller than the inner diameter of the inner peripheral surface 33 of the cylindrical body 32 and is arranged concentrically with the inner peripheral surface of the cylindrical body 32. In this embodiment, the inner peripheral surface of the inner frame 38 and the inner peripheral surface of the cylindrical body 32 are arranged substantially parallel.

A nozzle 37 as a coolant layer forming portion is formed at an upper position of the cylindrical body 32 corresponding to the inner frame 38. The nozzle 37 is formed with a nozzle hole 37 a that opens to the inside of the cylinder 32. The nozzle hole 37a is formed to face the inner frame 38 with a predetermined gap.

The lower end portion along the axis O of the inner frame 38 is provided with a tip bending portion (coolant layer forming portion) 38a. In the present embodiment, the front end bent portion 38a has a plate shape that extends from the lower end of the inner frame 38 to the radial direction outward substantially perpendicular to the axis O, and between the outer peripheral end of the front end bent portion 38a and the inner peripheral surface 33 The gap constitutes a coolant discharge portion 52 that is intermittent (may be continuous) in the circumferential direction. The radial width t1 of the coolant discharge portion 52 is not particularly limited, and can be determined according to the relationship with the thickness of the coolant layer 50, and is preferably 1 to 50 mm. In addition, the width t1 may be thinner than the thickness of the coolant layer 50.

In addition, the front end bent portion 38a protrudes radially outward from the inner frame 38 concentric with the inner peripheral surface 33, thereby forming a stable flow forming portion (for stable flow forming) facing the nozzle hole 37a inside the nozzle hole 37a Space) 40. The internal volume of the steady flow forming portion 40 is determined based on the length L1 along the axis O of the inner frame 38 and the radial width t2 of the tip bent portion 38a. The greater the radial width t2 of the tip bending portion 38a, the larger the internal volume of the steady flow forming portion 40, and the greater the function as the steady flow forming portion, but there is an opening that narrows the drop of the molten metal 21a into the inside of the barrel 32 Area tendency. Preferably, the radial width t2 of the front-end bent portion 38a relative to the radial width t1 of the coolant discharge portion 52 is determined to be 1/10 to 9/10.

In the steady flow forming portion 40, the coolant flowing from the nozzle hole 37a toward the radially inner side collides with the inner frame 38, and the flow of the flange 39 toward the upper side along the axis O is restricted, and the tip bending portion 38a The flow toward the lower side along the axis O is restricted. Therefore, the cooling liquid flowing out from the nozzle hole 37a toward the radially inner side temporarily stabilizes the turbulent flow in the steady flow forming portion 40, and is discharged from the cooling liquid ejecting portion 52 at a high speed along the inner peripheral surface, so that The inner side of the inner peripheral surface 33 forms a coolant layer 50 along the axis O. In addition, the steady flow forming portion 40 is disposed inside the coolant ejection portion 52 (inner diameter side) at the upper portion of the cylinder 32. That is, with the inner frame 38 and the front-end bent portion 38 a, the stable flow forming space portion 40 is formed on the inner diameter side of the cooling liquid ejecting portion 52 at the upper portion of the cylindrical body 32.

The axial length L1 of the inner frame 38 only needs to be a length that covers the nozzle hole 37 a so that the liquid surface of the cooling liquid layer 50 with a sufficient axial length L0 is exposed on the inner peripheral surface 33 of the cylinder 32. The axial length L0 of the coolant layer 50 exposed on the inner side is preferably 5 to 500 times longer than the axial length L1 of the inner frame 38. In addition, the inner diameter of the inner peripheral surface 33 of the cylindrical body 32 is not particularly limited, but is preferably 50 to 500 mm.

In this embodiment, a nozzle 37 as a spiral flow forming portion is connected to a plurality of locations in the circumferential direction at the upper part of the cylindrical body 32 in the Z-axis direction. By connecting the nozzle 37 to the tangential direction of the barrel 32, the cooling liquid enters the barrel 32 from the nozzle 37 so as to rotate around the axis O. The flow of the cooling liquid from the cylinder 32 passes through the nozzle hole 37a and becomes a spiral flow having a liquid flow component from the inner peripheral surface 33 toward the radial inner side, collides with the inner peripheral surface of the inner frame 38, and forms a steady flow The portion 40 raises the pressure (static pressure), and discharges along the inner peripheral surface 33 of the cylinder 32 through the coolant discharge portion 52.

The rotating liquid flow of the cooling liquid supplied from the nozzle opening 37a of the nozzle 37 into the cylindrical body 32 and the gravity acting on the cooling liquid cause the cooling liquid flowing along the inner peripheral surface 33 of the cylindrical body 32 to become a spiral liquid flow ， Forming coolant layer 50. The drip molten metal 21a shown in FIG. 1 is incident on the inner peripheral liquid surface of the cooling liquid layer 50 formed in this way, and the dripping molten metal 21a flows together with the cooling liquid inside the cooling liquid layer 50 of the spiral flow to be cooled.

The metal powder manufacturing apparatus 10 of the present embodiment and the metal powder manufacturing method using the same are provided on the upstream side of the position where the dropped molten metal 21a ejected from the ejection port 23 of the metal supply part 20 contacts the coolant layer 50 The inner frame 38 of the tip bending portion 38a. Therefore, through the nozzle hole 37a, the flow of the coolant from the inner circumferential surface 33 toward the radially inner side from the inner circumferential surface toward the radial inner side is stabilized by the stable flow forming portion 40, and then, It is possible to deviate from the coolant discharge portion 52 in the direction of flowing along the inner peripheral surface 33 of the cylindrical body 32.

That is, in the steady flow forming portion 40, the cooling liquid toward the radially inner side collides with the inner frame 38, and the flow toward the lower side along the axis O is restricted at the tip bending portion 38a, and the cooling liquid is formed in the steady flow The portion 40 temporarily stabilizes the turbulent flow, and is ejected from the coolant ejection portion 52 along the inner circumferential surface of the cylinder 32. Therefore, even when the flow rate of the coolant is increased or the speed of the coolant is increased, the coolant layer 50 with a uniform thickness can be easily formed along the inner circumferential surface of the cylinder 32, and high-quality mineral powder.

In addition, the inner diameter of the front end bent portion 38a of the inner frame 38 is smaller than the inner diameter of the inner peripheral surface 33 of the cylindrical body 32, and the gap between the front end bent portion 38a and the inner peripheral surface 33 is configured to allow the cooling liquid to The coolant discharge portion 52 flowing on the inner peripheral surface 33. With this configuration, even when the flow rate of the cooling liquid or the speed of the cooling liquid is increased, it is easy to form the cooling liquid layer 50 with a uniform thickness along the inner circumferential surface of the cylindrical body 32.

In addition, in the present embodiment, the inner frame 38 is attached above the axis O of the cylindrical body 32. With such a configuration, it is easy to arrange the inner frame 38 on the upstream side of the position where the molten metal ejected from the metal supply unit 20 comes into contact with the cooling liquid.

In addition, in this embodiment, by connecting the nozzle 37 to the tangential direction of the barrel 32, the cooling liquid enters the barrel 32 from the nozzle 37 so as to rotate around the axis O. By installing the inner frame 38 inside the position where the cooling liquid is ejected from the nozzle 37 toward the tangential direction of the inner peripheral surface 33 of the cylindrical body 32, it is easy to form a spiral liquid flow of uniform thickness along the inner peripheral surface 33 of the cylindrical body 32的 冷 液 层 50。 The coolant layer 50.

In addition, in the above-described embodiment, it is configured such that the spiral liquid flow impinges from the nozzle hole 37a to the inner peripheral surface of the frame body 38, and the direction of the liquid flow is changed. The inner peripheral surface 33 of the 32 flows spirally. However, in this embodiment, it is not limited to such a flow.

For example, the liquid flow from the nozzle hole 37a formed in the inner peripheral surface 33 of the cylindrical body 32 toward the inner peripheral surface of the frame body 38 may be turned into a non-spiral liquid by connecting the nozzle 37 substantially vertically to the outer peripheral surface of the cylindrical body 32 Flow (a spiral liquid flow can also be mixed in a part). In this case, the non-spiral liquid flow collides with the inner circumferential surface of the frame 38, the direction of the liquid flow is changed, and is ejected through the cooling liquid ejection portion 52 to form a non-spiral liquid along the inner circumferential surface 33 of the cylindrical body 32流 的 冷 层 50。 The cooling layer 50.

Second embodiment

As shown in FIG. 2, the metal powder manufacturing apparatus 10 a according to an embodiment of the present invention is the same as the first embodiment except for the following, and common parts are marked with common part names and symbols, and common parts are described. Omit a part.

In the present embodiment, a folded end portion of the folded stable flow forming portion 42 for forming a predetermined radial gap t3 between the inner frame 38 and the inner diameter side front end of the front end bent portion 38a of the cooling portion 30a is provided 38b. In this embodiment, the folded end portion 38b is formed to be substantially concentric with the inner frame 38, but it may be formed obliquely to the inner frame 38 in a tapered shape on the condition that the folded stable flow forming portion 42 is formed.

The length L2 along the axis O of the folded end 38b is not particularly limited, but it is preferably shorter than the length L1 along the axis O of the inner frame 38. The folded end 38b is not blocked from the nozzle hole 37a toward the inside The relationship of the flow of the coolant in the frame 38. The radial gap t3 of the folded steady flow forming portion 42 is smaller than the radial width t2 of the tip bent portion 38a by the thickness of the folded end portion 38b.

In the present embodiment, by providing the folded end portion 38b, the folded stable flow forming portion 42 is formed below the stable flow forming portion 40 along the axis O, and the flow of the cooling fluid flowing from the cooling liquid ejecting portion 52 is further stabilized It is easy to form a coolant layer 50 with a uniform thickness along the inner peripheral surface 33 of the cylindrical body 32.

Third embodiment

As shown in FIG. 3, the metal powder manufacturing apparatus 110 and the metal powder manufacturing method of the third embodiment of the present invention are the same as those of the first embodiment or the second embodiment except for the following, and common components are marked. Common part names and symbols, and description of common parts are omitted.

In the present embodiment, the metal powder manufacturing apparatus 110 has the flow path box 136 as the coolant layer forming portion in the cooling portion 130a. The flow path box 136 is attached to the upper portion of the cylindrical body 32 in the direction of the axis O. A flow path is formed inside the flow path box 136. A plurality of nozzles 137 are connected to the upper portion (or lower portion) of the channel box 136 in the direction of the axis O. These nozzles 137 may be connected to the outer peripheral side obliquely with respect to the axis O at the upper portion (or lower portion) of the flow channel box 136 in such a manner that a spiral flow of coolant is formed inside the flow channel box 136.

Alternatively, these nozzles 137 may be connected to the outer peripheral side parallel to the axis O at the upper portion (or lower portion) of the flow path case 136. Alternatively, the nozzle 137 may be connected to the outer circumferential surface of the flow channel box 136 so as to form a spiral flow of coolant inside the flow channel box 136.

On the inner peripheral side of the flow path box 136, an inner frame 138 (corresponding to the inner frame 38 shown in FIG. 1) is formed integrally with the flow path box 136. The inner frame 138 has an inner diameter smaller than the inner circumferential surface 33 of the cylindrical body 32, and the lower end portion of the inner frame 138 is integrally formed with a front end bent portion 138a. The gap between the front-end bent portion 138a and the inner peripheral surface 33 becomes the coolant discharge portion 52. In this embodiment, by forming a circumferential hole in the lower inner circumferential side of the flow channel case 136, the coolant ejection portion 52 can be formed. The outer diameter of the coolant ejection portion 52 coincides with the inner diameter of the inner peripheral surface 33, and the inner diameter of the coolant ejection portion 52 coincides with the inner diameter of the tip bent portion 138a.

In the present embodiment, the flow of the cooling liquid flowing from the cooling liquid ejection portion 52 into a spiral flow along the inner peripheral surface 33 by the flow of the cooling liquid entering the flow path case 136 from the nozzle 137.与 Formation of coolant layer 50. Or, the flow of the cooling liquid flowing out from the cooling liquid ejection portion 52 becomes a liquid flow parallel to the axis O along the inner peripheral surface 33, and the cooling liquid layer 50 is formed.

The metal powder manufacturing apparatus 110 of the present embodiment and the metal powder manufacturing method using the same are provided with an attachment on the upstream side of the position where the dropped molten metal 21a ejected from the ejection port 23 of the metal supply part 20 contacts the coolant layer 50 The inner frame 138 of the tip bending portion 138a. Therefore, it is possible to stabilize the cooling liquid in the radial direction inside of the flow channel case 136 by the steady flow forming portion 40, and then, from the cooling liquid ejecting portion between the front-end bent portion 138a and the inner peripheral surface 33 52 is ejected along the inner peripheral surface 33 of the cylinder 32.

Therefore, even when the flow rate of the coolant is increased or the speed of the coolant is increased, the coolant layer 50 with a uniform thickness can be easily formed along the inner circumferential surface of the cylinder 32, and high-quality mineral powder. In addition, in this embodiment, as in the second embodiment, a folded end portion (folded end portion 38b shown in FIG. 2) may be provided at the radially outer end of the front-end bent portion 138a.

Fourth embodiment

As shown in FIG. 4, the metal powder manufacturing apparatus 210 according to an embodiment of the present invention is the same as the first to third embodiments except for the following, and the common parts are marked with common part names and symbols. A description of common parts is omitted.

In the embodiment shown in FIGS. 1 to 3, the tip bent portion 38a or 138a is substantially perpendicular to the inner frame 38 or 138, but it is not necessarily perpendicular, and may be inclined at an inclination angle θ2. In addition, in this embodiment, a plurality of nozzles 237 are connected to the upper portion (or lower portion) in the direction of the axis O of the flow channel case 236.

In the present embodiment, the inclination angle (taper angle) θ2 of the cooling portion 230 with respect to the inner frame 238 of the tip bending portion 238a or the axis O is not particularly limited, but is preferably 5 to 45 degrees. By inclining the front end bent portion 238a toward the lower end in the axial direction into a tapered shape, a force acting in the direction in which the cooling liquid squeezes against the inner peripheral surface 33 of the cylindrical body 32 acts to form a uniform shape along the inner peripheral surface 33 of the cylindrical body The thickness of the coolant layer 50. In this embodiment, as in the second embodiment, a folded end portion (folded end portion 38b shown in FIG. 2) may be provided at the radially outer end of the front-end bent portion 238a.

In addition, the present invention is not limited to the above-described embodiment, and various changes can be made within the scope of the present invention.

[Example]

Hereinafter, the present invention will be further described based on detailed examples, but the present invention is not limited to these examples.

Examples

Using the metal powder manufacturing apparatus 10 shown in FIG. 1, Fe-Si-B (Experiment No. 6), Fe-Si-Nb-B-Cu (Experiment No. 7), and Fe-Si-BP-Cu (Experiment No. 8) Metal powder composed of Fe-Nb-B (Experiment No. 9) and Fe-Zr-B (Experiment No. 10).

In each experiment, the dissolution temperature was 1500 ° C, the injection gas pressure was 5 MPa, the gas type argon gas was used, and it was set to be constant, and the pump pressure in the spiral water flow condition was 7.5 kPa. In the examples, metal powder having an average particle diameter of about 25 μm can be produced. The average particle diameter is determined using a dry fineness distribution measuring device (HELLOS). In addition, the crystal analysis of the metal powders produced in Experiment Nos. 6 to 10 was evaluated by the powder X-ray diffraction method. The magnetic properties of the metal powder were evaluated by measuring the coercive force (Oe) with an Hc meter. The results are shown in Table 1. In addition, the thickness of the coolant layer 50 was observed to be 30 mm, and the deviation in the direction of the axis O was small.

Comparative example

The metal powder (experiment numbers 1 to 5) was manufactured in the same manner as in the example using the same metal powder manufacturing apparatus as in the example except that the frame body 38 and the tip bending portion were not provided, and the same evaluation was performed. The results are shown in Table 1. It is observed that the thickness of the coolant layer 50 is 30 mm, and the deviation in the direction of the axis O is large.

When the examples of Table 1 are compared with the comparative examples, the magnetic properties are improved and the amorphousness is improved in the examples. It is considered that this is because the cooling liquid is once cut off and stabilized in the steady flow forming portion 40, thereby obtaining a higher-quality spiral water flow and obtaining a uniform cooling effect. In addition, there are comparative examples in which crystallization analysis of metal powder by powder X-ray diffraction has a peak due to crystallization. Regarding the magnetic properties of the metal powder, it can be confirmed that the coercive force of the comparative example is all larger than that of the example, and the example is excellent. Therefore, it can be seen that a more uniform cooling effect can be obtained.

When comparing the above comparative example with the example, the provision of the stable flow forming part 40 can obtain a stable water flow even in a state where the pump pressure is high, and therefore, a uniform cooling effect can be obtained even compared to the conventional Amorphous properties can also be confirmed for compositions that cannot be produced, and magnetic properties can be further improved.

Table 1

10, 10a, 110, 210‧‧‧‧Metal powder manufacturing equipment

20‧‧‧Molten Metal Supply Department

21‧‧‧Molten metal

21a‧‧‧Dripping molten metal

22‧‧‧Container

23‧‧‧Spray outlet

24‧‧‧Heating coil

26‧‧‧Gas injection nozzle

27‧‧‧Gas injection port

30, 30a, 130, 230

32‧‧‧Cylinder

33‧‧‧Inner peripheral surface

34‧‧‧Exhaust

35‧‧‧Adjustment plate

37‧‧‧ nozzle

37a‧‧‧Nozzle hole

136, 236‧‧‧flow box

137, 237‧‧‧ nozzle

38, 138, 238‧‧‧ inner frame

38a, 138a, 238a

38b‧‧‧Folded end

39‧‧‧Mounting flange

40‧‧‧Stable flow formation section (space for stable flow formation)

42‧‧‧Folding stable flow forming section

50‧‧‧coolant layer

52‧‧‧coolant ejection section

L0, L1‧‧‧Axis length

O‧‧‧Axis

t1, t2, t3 ‧‧‧ width

Z‧‧‧Vertical line (Z axis)

θ1, θ2‧‧‧Angle

FIG. 1 is a schematic cross-sectional view of a metal powder manufacturing apparatus according to an embodiment of the present invention. 2 is a schematic cross-sectional view of a metal powder manufacturing apparatus according to another embodiment of the present invention. 3 is a schematic cross-sectional view of a metal powder manufacturing apparatus according to still another embodiment of the present invention. 4 is a schematic cross-sectional view of a metal powder manufacturing apparatus according to still another embodiment of the present invention.

Claims (5)

A metal powder manufacturing apparatus, characterized by comprising: a molten metal supply unit that ejects molten metal; a cylinder body that is provided below the molten metal supply unit; and a coolant layer forming unit that extends along the cylinder An inner peripheral surface of the body forms a flow of cooling liquid that cools the molten metal ejected from the molten metal supply portion, and the cooling liquid layer forming portion has an axial center on the cylindrical body An inner frame provided in the upper part in the direction, the inner frame having an inner diameter smaller than the inner diameter of the inner peripheral surface of the cylindrical body, and a lower end portion along the axis of the inner frame A tip bending portion protruding radially outward, the inner diameter of the tip bending portion is smaller than the inner diameter of the inner peripheral surface of the cylinder, and the gap between the tip bending portion and the inner peripheral surface A cooling liquid ejection portion for flowing the cooling liquid along the inner peripheral surface is formed, and a space portion for forming a stable flow is formed on the upper portion of the cylindrical body by the inner frame and the tip bending portion On the inner diameter side of the coolant discharge portion, in the space for forming a steady flow, the coolant inward in the radial direction collides with the inner frame, and the bent portion at the front end faces the axis along the axis The liquid flow on the lower side is restricted, and the cooling liquid is temporarily stabilized in the space for forming a stable flow, and is discharged from the cooling liquid discharge part along the inner circumferential surface of the cylinder . The metal powder manufacturing apparatus according to item 1 of the patent application range, wherein the tip bending portion is inclined toward the lower end of the tip bending portion in the axial direction at a predetermined angle with respect to the inner frame in a tapered shape, to A force acts in a direction to squeeze the cooling liquid toward the inner peripheral surface of the cylinder. The apparatus for manufacturing metal powder according to item 1 or 2 of the patent application range, wherein a nozzle is connected to a plurality of parts in the circumferential direction at the upper part of the axial direction of the cylinder, so that the cooling liquid is directed toward the The impact of the inner frame is spiral. The metal powder manufacturing apparatus according to any one of claims 1 to 3, wherein a tip end for forming a predetermined gap with the inner frame is provided at a tip end of the tip bending portion unit. A method of manufacturing metal powder, comprising: a step of forming a flow of a cooling liquid along an inner peripheral surface of a cylinder provided below a molten metal supply portion; and causing molten metal to flow from the molten metal supply portion The step of spraying the liquid flow of the cooling liquid, the metal powder manufacturing method uses the metal powder manufacturing apparatus described in any one of claims 1 to 4, from the upper part of the cylinder to the The space for forming a stable flow provided inside the cylindrical body passes along the gap of the cylindrical body through the gap between the front-end bent part as the coolant discharge part and the inner peripheral surface The inner peripheral surface sprays the cooling liquid.