KR20210101086A - fluid spraying nozzle assembly - Google Patents

Abstract

A fluid spray nozzle assembly according to the present invention comprises a first and a second spray nozzle having different forms and spray directions from each other. The first spray nozzle sprays fluid at the largest spray angle and primarily splits molten metal to atomize the same into liquid droplets with fine particle sizes. The second spray nozzle has the smallest spray angle and sprays the fluid in a spray direction closer to verticality to drop the sprayed molten liquid droplets. An additionally included third spray nozzle is placed between the first and the second spray nozzle and has a medium spray angle to perform a split and a drop all together, thus prevents sprayed tiny powder from adhering to the other molten liquid droplets and minimizes formation of satellite powders.

Description

Fluid spraying nozzle assembly

One aspect of the present invention relates to a fluid jet nozzle assembly that can be used in an apparatus for manufacturing powder by jetting a fluid.

Pure metals (Fe, Co, Ni, Cu, Zn, Al, Ti), alloys (ferrous (Fe)-non-ferrous (Al, Cu, Ni, Co, Ti)), relatively low-melting ceramic powders ( CuO, SnO, PbO, B2O3) and raw materials of their complexes are melted at a high temperature to produce a solid powder, usually conventionally known atomization process and centrifugal process are used.

In the former spraying method, for the purpose of manufacturing various pure metals and alloy powders, a raw metal ingot is charged into a crucible in a vacuum or inert atmosphere, melted completely in a high-frequency induction furnace or arc furnace, and the liquid metal passing through the microtubule is cooled. As a method of producing a fine powder form by high-pressure spraying with a medium (N ₂ , Ar, He, air, water or a mixture thereof), when oxidation is a problem in the powder obtained by this method, it is mainly an inert gas (N ₂ , Ar, He) is used, but when there is no oxidation problem, it is manufactured using air, high-pressure water (H ₂ O) or water and gas (air, N ₂ ). Depending on the size, shape and particle size distribution of the alloy powder, different powders are obtained.

These spraying methods are divided into gas spraying and water spraying depending on the type of cooling medium. First, the gas spraying method uses inflammable gas (N ₂ , Ar, He) or air as a cooling medium. Although alloy powder can be produced, it is difficult to produce amorphous powder by gas spraying method because a faster cooling effect is required when manufacturing amorphous powder.

In addition, the satellite powder produced by attaching fine powder to the surface of the partially manufactured powder is a problem, and the production cost increase is a problem because the price of the gas used is relatively high.

On the other hand, since the water injection method uses relatively inexpensive water (H ₂ O), the production cost of powder products can be reduced, and fine segregation can be reduced because of the large cooling effect, but in particular, surface oxidation of the manufactured powder and high pressure water generation There is a problem that the equipment cost is high, and in order to lower the average particle diameter of the metal powder, a method of increasing the water pressure or increasing the water spray nozzle angle was applied. very difficult

Recently, interest in the technology is growing as the field of application of metal 3D printing technology has been expanded and its ripple effect is growing. The development of powder materials for printing is actively progressing.

Most of the metal powder used in the 3D printing process is a spherical powder manufactured by a gas atomizing method. This is because the spherical shape has excellent fluidity and is advantageous for uniform application or discharge of the powder layer, and thus the density and mechanical properties of the molded body can be improved.

The metal powder material currently supplied has a very low manufacturing yield and is supplied at a high price. In general, in the case of the metal powder used for 3D printing of the PBF (Power Bed Fusion) method, a spherical powder with a size of 10 to 45 μm is used. On the other hand, in the case of using the general gas atomizing method, a powder having a wide particle size distribution of 10 to 200 μm with a particle size of about 80 μm is manufactured. because it is only

For this reason, a metal powder manufacturing apparatus has been continuously studied until recently, and the market demand for a method for manufacturing a metal powder having an excellent spherical performance and a fine particle size according to the purpose and use of the product continues.

Republic of Korea Patent Publication No. 10-0819534

One aspect of the present invention provides a fluid injection nozzle assembly capable of efficiently crushing a molten metal stem of molten metal to form a powder having excellent spherical performance by controlling the formation of satellite powder while breaking molten metal droplets into fine particle diameters. aim to

One aspect of the present invention is

As a fluid injection nozzle assembly for splitting by spraying a fluid on a molten metal liquid injection stem, the first fluid is injected to a first point of the injection stem, and the first fluid is injected in a direction forming a first injection angle with the injection stem a first injection nozzle; and

It is located on the downstream side of the first point of the injection stem, and includes a second injection nozzle for injecting a second fluid in a direction forming a second injection angle with the injection stem,

The difference between the first injection angle and the second injection angle includes 40 to 60°.

At this time, it is preferable that the first injection angle is 62 to 75°, and the second injection angle is 2 to 60°,

It may further include a third injection nozzle positioned between the first injection nozzle and the second injection nozzle and injecting a third fluid in a direction forming a third injection angle with the injection stem.

In addition, the difference between the first and third injection angles is preferably 3 to 10°, and the third injection angle is preferably 60 to 73°.

In addition, it is preferable that the ratio of the split molten metal falling in the injection direction of the second injection nozzle is 80 to 100%,

The distance between the third injection nozzle and the injection stem may be 1.5 to 3 times the distance between the first injection nozzle and the injection stem.

In this case, the third injection nozzle is preferably an annular injection nozzle including an annular slit, the first fluid is preferably an inert gas, and the second fluid and the third fluid are preferably an inert gas or water.

The fluid injection nozzle assembly according to one aspect of the present invention includes two or more fluid injection nozzles for injecting fluid by varying the injection pressure and angle, and from the first injection nozzle having a high injection angle to the splitting of the molten metal liquid injection stem. The powdering is performed efficiently, and since the second injection nozzle with a low injection angle descends small molten metal droplets, it is possible to manufacture molten metal droplets with a fine particle size, but also completely cool the scattered light molten metal droplets by sedimentation to the bottom. It suppresses the formation of satellite powder due to the bonding between the molten metal droplets that have not been formed, so that it is possible to manufacture a metal powder with excellent spherical performance.

1 is a cross-sectional view schematically showing the structure of a fluid injection nozzle assembly;
2 is a cross-sectional view schematically illustrating an operating state of the fluid injection nozzle assembly.
3 is a cross-sectional view schematically showing an embodiment of a powder manufacturing apparatus including a fluid injection nozzle assembly;
4 is a cross-sectional view schematically showing another embodiment of a powder manufacturing apparatus including a fluid injection nozzle assembly.

Prior to describing the present invention in detail below, it is to be understood that the terminology used herein is for the purpose of describing specific embodiments and is not intended to limit the scope of the present invention, which is limited only by the appended claims. shall. All technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art, unless otherwise stated.

Throughout this specification and claims, unless stated otherwise, the term comprise, comprises, comprising is meant to include the stated object, step or group of objects, and steps, and any other object. It is not used in the sense of excluding steps or groups of objects or groups of steps.

On the other hand, various embodiments of the present invention may be combined with any other embodiments unless clearly indicated to the contrary. Any feature indicated as particularly preferred or advantageous may be combined with any other feature and features indicated as preferred or advantageous. Hereinafter, embodiments of the present invention and effects thereof will be described with reference to the accompanying drawings.

The fluid injection nozzle assembly 12, which is an aspect of the present invention, is a component that is formed around the orifice 11 and sprays a fluid to form molten metal droplets, and includes a first injection nozzle 121, a second injection nozzle ( 122) is included.

The orifice 11 is a discharge port through which the molten metal liquid jet stream flows, and the shape is not limited, and it is preferable that the orifice 11 is a hollow tube body having a symmetrical shape on the central axis and having a flow path formed therein.

The first injection nozzle 121 is located around the orifice 11 and injects the first fluid in the first injection direction 14 toward the molten metal liquid injection stem to cause primary splitting. The first injection nozzle 121 can crush the molten metal stem with a diameter of 0.5 mm to 4 mm, preferably, the smaller the fracture diameter is, the better, but depending on the conditions such as the pressure to be injected, it can be crushed to 1 mm to 500 μm. .

1 is a cross-sectional view schematically showing a fluid injection nozzle assembly 12 according to an embodiment of the present invention. The first injection nozzle 121 may atomize the molten metal by injecting a gas into the first fluid, and the type of the injected gas is not limited, but is preferably an inert gas such as argon, nitrogen, or helium gas. The molten metal stem flowing down from the orifice 11 is atomized by the first injection nozzle 121 and divided into molten metal droplets and a small molten metal stem.

The shape of the first injection nozzle 121 is not limited, but is preferably an annular or annular shape surrounding the periphery of the orifice 11 , and The height may be equal to or higher than the outlet of the orifice 11 .

In an embodiment of the present invention, the annular first injection nozzle 121 may be configured such that its center is located on the central axis of the nozzle, and in this case, the first injection nozzle 121 is located on the central axis of the nozzle. The first fluid may be sprayed toward the first point. In the cross section of the first injection nozzle 121 cut by a plane including the central axis, the smaller of the angles between the straight line in the first injection direction 14 of the first injection nozzle 121 and the central axis of the nozzle, the first injection nozzle ( 121), the first injection angle may be 62° to 75°, preferably 66° to 72°.

When the first injection angle is out of the corresponding range, the coolant gas is directly exposed to the end of the orifice 11 , thereby clogging the tap part may occur. Therefore, it is preferable not to deviate from the corresponding range in order to manufacture the fine powder.

The injection angle of the injection nozzle and the angle at which the actual fluid is injected may be different, because when the fluid is injected, the fluid is sprayed due to a drop in ambient pressure and spreads in a wider range than the injection angle, which means the direction of the injection nozzle, about 2 degrees There may be a difference of about to 5 degrees.

The fluid pressure of the first injection nozzle 121 may be adjusted to 5 bar to 100 bar, and it is preferable to provide a pressure of 30 bar to 70 bar.

When the pressure is less than the corresponding range, the molten metal is not split well and the particle size of the powder to be manufactured increases.

The second injection nozzle 122 cools the molten droplets split by the first injection nozzle 121 and sets them down. The type of the second fluid to be sprayed is not limited, and may be liquid or gas, for example, water may be sprayed.

The second injection nozzle 122 is located on the downstream side of the first point with respect to the injection direction of the molten metal liquid, and the shape thereof is not limited, but is preferably arranged in a symmetrical shape with respect to the central axis of the nozzle. The second jet nozzle 122 may be, for example, an annular or annular fluid jet nozzle centered on the central axis of the nozzle and having a larger diameter than the first nozzle.

It is preferable that the distance between the second injection nozzle 122 and the central axis is greater than the distance between the first injection nozzle 121 and the central axis. The injection stem may be formed along the central axis, and the distance between the injection stem and the second injection nozzle 122 may be 1.5 to 3 times the distance between the first injection nozzle 121 and the injection stem.

The second injection nozzle 122 injects the second fluid in the second injection direction 15 toward the second point located on the downstream side of the first point, and the second injection direction 15 or a straight line parallel thereto and When the angle formed by the central axis is referred to as the second injection angle of the second injection nozzle 122 , it is preferable that the second injection angle be smaller than the first injection angle. The second injection angle may be 0° to 60°, preferably 0° or more, preferably 40° or less, and more preferably 2° to 30°. The second injection direction 15 may have a vertical injection direction parallel to the central axis, and the second point may not exist depending on the size of the second injection angle,

A difference between the first and second injection angles may be 40° to 60°.

If the second injection angle is larger than the corresponding range, an additional cooling effect can be given to the scattered droplets and change and control of the microstructure of the powder may be possible, but the effect of suppressing the formation of satellite powder due to rapid contact with the powder is not deteriorated. has a problem.

The second injection nozzle 122 may additionally divide the molten metal stem and the molten droplet split by the first injection nozzle 121 , and sediment the fine molten droplet downward. The injected second fluid may be a gas or a liquid, and is not limited to a type.

The second injection nozzle 122 may additionally crush and cool the droplets scattered through the first injection nozzle 121 and the third injection nozzle 123 to manufacture fine powder. The shape of the droplets can be controlled to a size of about 80um to 30um, and the powder shape can preferably be controlled with a size of about 50um to 30um.

The fluid pressure of the second injection nozzle 122 may be adjusted to 20 bar to 500 bar, and it is preferable to provide a pressure of 100 bar to 300 bar.

The third injection nozzle 123 may additionally divide the molten metal stem and the molten droplet split by the first injection nozzle 121 , and sediment the fine molten droplet downward. The injected third fluid may be a gas or a liquid, and is not limited to a type.

The third injection nozzle 123 may be provided at a position downstream from the first injection nozzle 121 and upstream from the second injection nozzle 122 . The shape of the third injection nozzle 123 positioned between the first injection nozzle 121 and the second injection nozzle 122 is not limited, but it is preferable to be disposed in a symmetrical form with respect to the central axis of the nozzle, for example, For example, one or more gun-type fluid injection nozzles may be arranged around a central axis of the nozzle. It is preferable that the third injection nozzle 123 has a different injection shape from the first injection nozzle 121, and the distance between the injection nozzle and the central axis is lower than the first injection nozzle 121 and the first injection nozzle ( 121) and the distance between the central axis is better than the distance.

The third injection nozzle 123 is located on the downstream side of the first point, and injects the third fluid in the third injection direction 16 toward the third point located on the upstream side of the second point, and the injection direction is When the angle between the straight line and the central axis is referred to as the third jet angle of the third jet nozzle 123, the third jet angle may be smaller than or equal to the first jet angle, and preferably smaller than the first jet angle. The third injection angle may be 60 to 73°, preferably 66° to 72°, and the difference from the first injection angle may be in the range of 3 to 10°.

There is an advantage in that the microstructure of the manufactured powder can be controlled when the operation is performed at the third injection angle within the corresponding range. Plate-shaped and polygonal powders other than these can be produced.

The fluid pressure of the third injection nozzle 123 may be adjusted to 5 bar to 100 bar, and it is preferable to provide a pressure of 30 bar to 70 bar. The fluid pressure of the third injection nozzle 123 may be the same as or lower than the fluid pressure of the first injection nozzle 121, and may be in the range of 0.8 to 1 times.

The second injection nozzle 122 controls the scattering distance of the molten droplets divided by the first injection nozzle 121 and the third injection nozzle 123, and descends downward to suppress the formation of satellite powder. It has the effect of classifying by particle size.

2 is a cross-sectional view showing the splitting form of the molten metal liquid according to the fluid injection nozzle assembly 12 according to an embodiment of the present invention. The second injection nozzle 122 may serve as a wall of fluid or an air curtain that descends the fine molten droplets that are split and scattered by the first injection nozzle 121 and the third injection nozzle 123. have.

The proportion of the split molten metal falling into the central axis direction from the injection direction of the second injection nozzle 122 is 80 to 100%, and preferably 90 to 100%.

It is preferable that the distance between the third injection nozzle 123 and the central axis is greater than the distance between the first injection nozzle 121 and the central axis. The injection stem may be formed along the central axis, and the distance between the injection stem and the third injection nozzle 123 may be 1.5 to 3 times the distance between the first injection nozzle 121 and the injection stem.

Heavy molten droplets with large particle diameters fall rapidly even after splitting and fall to a position close to the central axis, but small and light molten droplets can be dispersed with a large scattering distance away from the central axis. At this time, the second injection nozzle 122 cools and descends the molten droplets scattered far from the central axis in a vertical direction or a direction close to the vertical direction, so that the molten droplets are scattered outside the injection direction of the second injection nozzle 122. can prevent

For this reason, it is possible to prevent the molten droplets that are not completely cooled from being combined with the fine molten droplets to form a satellite powder, and since the metal powder is cooled and positioned near the central axis, there is an advantage that efficient cooling can be achieved.

The fluid injection nozzle assembly 12 according to an embodiment of the present invention can produce a spherical metal powder by spraying gas or cooling water to split the molten metal stem and cooling it at the same time. The particle diameter of the molten droplet split through the fluid injection nozzle assembly 12 and the metal powder produced by cooling may be 10 μm to 100 μm, and preferably 10 μm to 43 μm.

As another aspect of the present invention, a metal powder manufacturing apparatus including the above-described fluid injection nozzle assembly 12 may be disclosed. The apparatus for manufacturing metal powder, which is an embodiment of the corresponding aspect, includes an orifice 11 for spraying molten metal and a fluid injection nozzle assembly 12, and molten metal droplets are scattered from the lower portion of the fluid injection nozzle assembly 12 and cooled. It is made to include a chamber, and further includes a cooling water injection nozzle provided on the inner wall of the chamber 1 to further cool the molten metal droplets or to improve the cooling rate.

3 is a cross-sectional view schematically illustrating an embodiment of an apparatus for manufacturing metal powder, which is another aspect of the present invention.

The chamber 1 is a place where the molten metal particles are cooled inside, and is preferably composed of a cylindrical body having a space therein. The chamber 1 is located below the molten metal supply vessel. The shape of the chamber 1 is not limited, but it is preferably made of a cylindrical shape, and the inner diameter of the chamber 1 may be large at the top and smaller toward the bottom. D1/D2, which is the ratio of the inner diameter D1 in the upper part of the chamber 1 and the inner diameter D2 in the lower part of the chamber 1, is 1 or more, may be 3 or less, and preferably 1.2 to 2.5.

The central axis of the chamber 1 may be installed to coincide with the orifice 11 of the molten metal supply container, and preferably the same as the central axis of the fluid injection nozzle assembly 12 . Depending on the angle and arrangement of the coolant injection nozzles, the orifice 11 may not coincide with the central axis of the chamber 1, and the central axis of the chamber 1 is not parallel to the vertical direction, but is inclined to form a constant angle. can be

The type, position, shape, etc. of the cooling water jet nozzle that may be further included in the metal powder manufacturing apparatus is not limited, but for example, the following cooling water jet nozzle may be used in more detail.

The coolant spray nozzle provided on the inner wall of the chamber may be a nozzle that sprays coolant in a flat fan shape. A cooling water injection nozzle located at the uppermost part of the cooling water injection nozzles is referred to as a first cooling water injection nozzle 21 , and a height at which the first cooling water injection nozzle 21 is located is defined as a first height. The first coolant spray nozzle 21 may be a single coolant spray nozzle, and may include a plurality of coolant spray nozzles having the same first height.

Among the coolant injection nozzles located at a height lower than the first height, the coolant injection nozzle having the highest position is called the second coolant injection nozzle 22, and the height at which the second coolant injection nozzle 22 is located is called the second height. define. The second coolant spray nozzle 22 may be a single coolant spray nozzle, and may include a plurality of coolant spray nozzles having the same second height. Similarly, the third height, the fourth height, and the third coolant spray nozzle 23 and the fourth coolant spray nozzle 24 may be defined. Among the coolant injection nozzles located at a height lower than the (n-1)th height, the coolant injection nozzle having the highest position is called the nth coolant injection nozzle, and the height at which the nth coolant injection nozzle is located is defined as the nth height. can

The inclination angle can be interpreted as meaning an angle formed by the coolant spraying direction of the coolant spraying nozzle in a vertical direction with the inner wall of the chamber. It can be interpreted as an angle formed by a straight line of

The inclination angle of the first coolant spray nozzle 21 is referred to as a first inclination angle, and the inclination angle of the second coolant spray nozzle 22 is referred to as a second inclination angle. The inclination angle of the coolant spray nozzle 24 is referred to as a fourth inclination angle, and the inclination angle of the nth coolant spray nozzle is referred to as an nth inclination angle.

When there are a plurality of first coolant spray nozzles 21 positioned at the first height, all of the plurality of coolant spray nozzles may have the same first inclination angle or may have two or more first inclination angles. The arrangement of the cooling water jet nozzles 20 is not limited, but it is preferable for uniform cooling of the metal powder to be rotationally symmetric with respect to the central axis or to maximize the distance between the cooling water jet nozzles 20 .

For example, it is preferable that the two coolant spray nozzles 20 face each other with respect to the central axis, and the three coolant spray nozzles 20 form an angle of 120 degrees with respect to the central axis and are disposed in the form of an equilateral triangle. . In one embodiment of the present invention, the cooling water injection nozzles 20 are symmetrically disposed with respect to the central axis.

The coolant injection nozzles having different heights may be alternately disposed as shown in FIG. 2 . In the embodiment shown in FIG. 2 , the first coolant spray nozzle 21 and the second coolant spray nozzle 22 are alternately arranged, and the second coolant injection nozzle 22 and the third coolant injection nozzle 23 are alternately arranged. do.

The coolant spray nozzle 20 sprays coolant toward the central axis of the chamber 1 , and the spray direction of the nozzle has an inclination angle. The inclination angle may be increased as the height of the coolant injection nozzle decreases. The first inclination angle is 10° or more, and is made up of 60° or less, preferably in the range of 10° to 30°. Thereafter, the second inclination angle is the same as or greater than the first inclination angle, and the difference from the first inclination angle may be 0° or more and 30° or less, and preferably it is in the range of 5° to 15°.

The third inclination angle may be the same as or greater than the second inclination angle, and the difference from the second inclination angle may be 0° or more and 30° or less, preferably in the range of 5° to 15°.

Assuming that the first inclination angle of the first coolant injection nozzle 21 with the inner wall of the chamber 1 is θ11 and the nth inclination angle of the nth coolant injection nozzle is θ _{1n , θ 11} ≤ θ for n greater than 2 ₁₂ … A relationship such as ≤ θ _1n may be established, preferably θ ₁₁ < θ ₁₂ < … It is good that the relation of < θ _{1n holds.} The nth inclination angle is equal to or greater than the n-1th inclination angle, and the difference from the n-1th inclination angle may be 0° or more and 30° or less, preferably in the range of 5° to 15°.

The inclination angle of the coolant spray nozzle 20 may be adjusted. In the case of producing powder with different properties from molten metal of a single composition or in case of changing the composition of molten metal to produce powder with the same or better properties, the molten metal liquid by adjusting the spray angle of the coolant It is possible to control the enemy's scattering distance and cooling rate, and to form a powder with a higher amorphous ratio or spherical performance. The adjustment range of the inclination angle may be made in a range of 30 degrees vertically.

The coolant spray nozzle 20 has an inclination angle and sprays coolant to cool the metal droplets scattered by the fluid spray nozzle assembly 12, and the inclination angle of the coolant spray nozzle varies according to the first height. Since it can settle quickly, the formation of satellite powder can be more effectively prevented, and the sphericity can be improved in the preparation of powder having a desired particle size.

The arrangement in which the inclination angle increases as the height decreases has the effect of narrowing the interval between the stages of the coolant sprayed from the coolant spray nozzle as it approaches the central axis of the chamber 1 . A metal droplet having a larger diameter has a flight path closer to the central axis, so it passes through a plurality of cooling water layers at a high speed and has a high cooling rate, thereby increasing cooling efficiency.

The inclination angle of the coolant spray nozzle 20 may be adjusted. In the case of producing powder with different properties from molten metal of a single composition or in case of changing the composition of molten metal to produce powder with the same or better properties, the molten metal liquid by adjusting the spray angle of the coolant It is possible to control the enemy's scattering distance and cooling rate, and to form a powder with a higher amorphous ratio or spherical performance. The adjustment range of the inclination angle may be made in a range of 30 degrees vertically.

The coolant sprayed from the coolant spray nozzle is sprayed in the form of a flat sector, and the central angle of the sector is defined as the injection angle. The spray angle may range from 30° to 130°, preferably from 35° to 110°, and more preferably from 40° to 90°.

The fan-shaped injection of the cooling water spray nozzle 20 concentrates the cooling water compared to the cone-shaped injection, so the cooling water is sprayed at a high density, so the cooling efficiency is increased and it is easy to remove the water vapor layer on the surface of the metal powder. It has a large contact area and can be cooled by contacting even the molten metal droplets falling away from the central axis of the chamber.

When the first coolant spray nozzle 21 includes a plurality of coolant spray nozzles 20 , the first coolant spray nozzle 21 may have the same spray angle, and the spray angle varies according to the height of the spray nozzle. It can be adjusted to have a square shape.

In the embodiment shown in FIG. 2 , the spray angle increases as the height of the coolant spray nozzle 20 decreases. Assuming that the injection angle of the first coolant injection nozzle ₂₁ is θ 21 and the injection angle of the nth coolant injection nozzle is θ _2n , θ ₂₁ ≤ θ ₂₂ ≤ … ≤ θ _2n or θ ₂₁ < θ ₂₂ < … A relationship of < θ _2n can be established.

4 is a cross-sectional view schematically illustrating an embodiment of an apparatus for manufacturing metal powder, which is another aspect of the present invention. The metal powder manufacturing apparatus is a metal powder manufacturing apparatus including the same components as in the previous embodiment and further comprising an angle adjusting means.

The coolant spray nozzle 20 uses a jet nozzle to spray coolant at high speed, so that coolant can be sprayed in a cone or fan shape. The injection speed of the cooling water is 100 m/s to 300 m/s, and preferably exceeds 100 m/s and 250 m/s or less, and may be 150 m/s to 250 m/s.

The angle adjusting means is provided on the inner wall of the chamber 1 and is a means for adjusting the spray direction of the coolant spray nozzle 20 by coupling the coolant spray nozzle 20 . The type and shape of the angle adjusting means are not limited, but a method capable of being adjusted automatically or manually may be used, and the angle adjusting bracket combines the coolant spray nozzle 20 with the inner wall of the chamber 1 to form the angle of the spraying direction. can be adjusted. The angle constituting the injection direction of the cooling water injection nozzle 20 may be individually adjusted.

The angle adjusting means may be, for example, not shown in the drawings, including a support plate, a nozzle coupling plate, and a rotation part connected through a rotation shaft, and a means capable of rotating the support plate and the nozzle coupling plate about the rotation axis. At this time, the support plate is a part coupled to the inner wall of the chamber 1, and the nozzle coupling plate is coupled to the coolant injection nozzle to spray the coolant into the chamber.

라고 정의할 수 있고, 챔버(1)의 내벽을 따라 좌우방향으로 이루는 각 중 작은 각을 각θ라고 정의할 수 있다.The injection direction of the cooling water injection nozzle 20 is in the vertical direction away from the inner wall of the chamber 1 when defining an imaginary straight line in the vertical direction from the end of the cooling water injection nozzle toward the bottom of the chamber 1 . angle each

can be defined, and the smaller angle among the angles formed in the left and right directions along the inner wall of the chamber 1 may be defined as the angle θ.

라고 정의할 수 있다. When the angle adjusting means is fixed to the inner wall of the chamber 1 , the angle adjusting means is a virtual tangent plane in contact with the inner wall of the chamber 1 at the center point with respect to the center point of the coupling surface formed by being coupled to the chamber 1 . And assuming an imaginary normal plane including the central point and the central axis of the chamber 1, the angle θ the coolant injection nozzle 20 makes with the normal plane is the angle θ, and the angle the coolant injection nozzle 20 makes with the tangent plane is the angle

can be defined as

가 0° ≤

≤ 60°를 이룰 수 있으며, 더욱 바람직하게는 각θ가 0°< θ ≤ 30°를 이루고, 각

가 0° <

≤ 15°인 것이 좋으며 각θ는 제3분사노즐(123)의 분사각 및 크기에 따라 조절될 수 있다. The cooling water injection nozzle 20 has an angle θ of 0°≤ θ≤90°,

is 0° ≤

≤ 60°, more preferably the angle θ is 0° < θ ≤ 30°, the angle

is 0° <

It is preferable that ≤ 15°, and the angle θ may be adjusted according to the injection angle and size of the third injection nozzle 123 .

가 0° <

≤ 15°인 경우, 냉각수분사노즐(20)은 챔버(1)의 내부 방향으로 냉각수를 분사하지만 챔버(1)의 중심축에서 빗겨나가도록 냉각수가 분사된다. 비산되는 용융 액적 중 바깥쪽으로 비산되는 미세한 액적은 냉각수에 의해 급속 냉각될 수 있다. 복수의 제트노즐이 동일한 각도로 조절되어 냉각수를 분사하는 경우 바깥쪽으로 비산되는 액적의 전체에 대하여 높은 냉각속도를 제공할 수 있다.When the angle θ is 0°< θ ≤ 30°, the angle

is 0° <

When ≤ 15°, the coolant spray nozzle 20 sprays coolant in the inner direction of the chamber 1 , but the coolant is sprayed so as to deviate from the central axis of the chamber 1 . The fine droplets scattered outward among the scattered molten droplets may be rapidly cooled by the cooling water. When a plurality of jet nozzles are adjusted at the same angle to spray cooling water, it is possible to provide a high cooling rate for all of the droplets scattered outward.

In addition, the cooling water sprayed from the cooling water injection nozzles 20 facing each other do not collide with each other, so that the water flow is constantly formed, which has an advantageous effect of reducing the collision of the metal powder and the formation of the satellite powder. In the lower portion of the chamber 1, a rotational water flow may be formed in the cooling water injection direction, thereby increasing the cooling rate.

Since the angle of the cooling water injection nozzle 20 can be adjusted, it is possible to control the position and contact area of the scattered molten metal droplets with the sprayed cooling water, the scattering distance of the molten metal droplets, and the flight time. In addition, the thickness of the coolant layer and the flow of the swirling flow can be changed by adjusting the angle of the coolant spray nozzle 20 when forming a swirling flow using coolant, so that the molten metal droplets dispersed through the fluid spray nozzle assembly 12 can be removed. It is advantageous for rapid cooling.

Features, structures, effects, etc. exemplified in each of the above-described embodiments may be combined or modified for other embodiments by those of ordinary skill in the art to which the embodiments belong. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

1: chamber 11: orifice
12: fluid injection nozzle assembly 14: first injection direction
15: second injection direction 16: third injection direction
20: coolant injection nozzle 121: first injection nozzle
122: second injection nozzle 123: third injection nozzle
30: shielding plate 400: cooling water separation means
500: pressurizing means

Claims (11)

A fluid injection nozzle assembly for splitting the molten metal liquid by spraying a fluid on the molten metal liquid injection stem,
a first injection nozzle for injecting a first fluid to a first point of the molten metal liquid injection stem and for injecting the first fluid in a direction forming a first injection angle with the molten metal liquid injection stem; and
and a second injection nozzle located on the downstream side from the first point of the molten metal liquid injection stem and injecting a second fluid in a direction forming a second injection angle with the injection stem,
A difference between the first injection angle and the second injection angle is 40 to 60°.
According to claim 1,
The first injection angle is 62 to 75 ° fluid injection nozzle assembly.
According to claim 1,
The second injection angle is a fluid injection nozzle assembly of 2 to 60 °.
According to claim 1,
The fluid injection nozzle assembly further comprising a third injection nozzle positioned between the first injection nozzle and the second injection nozzle and injecting a third fluid in a direction forming a third injection angle with the molten metal liquid injection stem.
According to claim 1,
A proportion of the divided molten metal liquid falling into the inner region in the injection direction of the second injection nozzle is 80 to 100%.
5. The method of claim 4,
A difference between the first injection angle and the third injection angle is 3 to 10°.
5. The method of claim 4,
The third injection angle is a fluid injection nozzle assembly of 60 to 73 °.
5. The method of claim 4,
The distance between the third injection nozzle and the molten metal liquid injection stem is 1.5 to 3 times the distance between the first injection nozzle and the molten metal liquid injection stem.
5. The method of claim 4,
The third jet nozzle is an annular jet nozzle including an annular slit.
According to claim 1,
wherein the first fluid is an inert gas.
5. The method of claim 4,
The second fluid and the third fluid are inert gas or water.

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