CN104858442A - Blocking-preventing nozzle device used for preparing metal powder through gas atomization method - Google Patents
Blocking-preventing nozzle device used for preparing metal powder through gas atomization method Download PDFInfo
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- CN104858442A CN104858442A CN201510311156.6A CN201510311156A CN104858442A CN 104858442 A CN104858442 A CN 104858442A CN 201510311156 A CN201510311156 A CN 201510311156A CN 104858442 A CN104858442 A CN 104858442A
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Abstract
The invention relates to a blocking-preventing nozzle device used for preparing metal powder through a gas atomization method. The blocking-preventing nozzle device comprises a flow guiding pipe and a gas cavity located around the flow guiding pipe. The gas cavity is connected with a gas inlet pipe, and a nozzle circular seam communicated with the gas cavity is formed in the periphery of the lower end of the flow guiding pipe; a gas guiding seam surrounding the flow guiding pipe is formed between the gas cavity and the flow guiding pipe, and an opening of the gas guiding seam is located between the flow guiding pipe and the nozzle circular seam; a gas guiding hole communicated with the gas guiding seam is formed in the wall of the gas cavity. The blocking-preventing nozzle device can reduce nodulation of molten metal at a nozzle and prevent the flow guiding pipe from being blocked.
Description
Technical field
The present invention relates to the non-fouling nozzle device that a kind of gas atomization prepares metal dust, belong to gas atomization field of metallurgy.
Background technology
Gas-atomized powder technology utilizes high velocity air liquid metal atomized powder is broken into droplet and is frozen into the technology of powder.The metal dust oxygen content prepared due to it is low, powder good sphericity, and becomes at present by one of a kind of method preparing metal dust of adopting in a large number.Mozzle and atomizer are the keys of gas-atomized powder technology, they have determined that performance and the nebulization efficiency of atomized powder.Traditional atomizer atomization gas is sewn on mozzle lower end by nozzle ring collect, and molten metal is flowed out by mozzle, is atomized gas atomization fragmentation and makes metal dust.Usually, when being atomized, molten metal, by after draft tube outlets, is atomized gas and cools fast, and be very easily bonded in the outlet of mozzle, form dross and slowly grow up, until block mozzle, thus interruption atomization process, have a strong impact on the quality of production and product.
Summary of the invention
The technical problem that the present invention solves prevents atomizer from blocking mozzle because of dross.
Technical scheme of the present invention is, provides the non-fouling nozzle device that a kind of gas atomization prepares metal dust, comprises mozzle and is positioned at the air cavity around mozzle, and air cavity connects air inlet pipe, establishes the nozzle circumferential weld be communicated with air cavity around the lower end of mozzle; Between air cavity and mozzle, establish the air guide around mozzle to stitch, the opening of air guide seam is between mozzle and nozzle circumferential weld; The chamber wall of air cavity is established and stitches with air guide the gas port be communicated with.
Further, sticking device of setting up defences between air cavity and mozzle, forms air guide seam between air cavity and anti-sticking device.
Further, the connectivity part that gas port and air guide are stitched establishes surge chamber.
Further, the chamber wall of air cavity is uniformly distributed four gas ports.
Further, the width of air guide seam is 0.5 ~ 1.0 mm.
Further, the width of gas port is 0.8 ~ 1.5mm.
Further, mozzle comprises outer tube and is placed in the interior pipe composition of outer tube, and outer tube is metal tube, and interior pipe is earthenware, fills between outer tube and interior pipe with magnesia; Mozzle is cylindrical.
Further, the length of the part of anti-sticking device bottom is stretched out in mozzle bottom is 2 ~ 3mm.
Further, the internal diameter of mozzle is 4 ~ 8mm.
Further, the angle α that the center line of nozzle circumferential weld is formed is atomization angle, and α is 45 ° ~ 60 °.
Further, the pressure of gas intracavity gas and atomizing pressure are 2 ~ 6 MPa.
Spray nozzle device provided by the invention, its anticlogging general principle is: molten metal flows into nebulization region (i.e. mozzle lower end, atomization gas passes through the intersection of nozzle circumferential weld and molten metal) by mozzle; Gases at high pressure enter air cavity by air inlet pipe, then impact molten metal after the ejection of nozzle circumferential weld, thus liquid metal is ground into droplet, and obtain metal dust.Simultaneously, entering gas in air cavity also can enter in air guide seam by gas port, because air guide seam only has a downward outlet, therefore can produce a downward impulsive force, make molten metal when very little dross has just appearred in draft tube outlets, just blown off by downward impulsive force.Gas port is arranged on the chamber wall of air cavity, and connection air cavity and air guide are stitched, and the connectivity part that gas port and air guide are stitched is provided with surge chamber, can make uniform stream.Should being evenly distributed on the chamber wall of air cavity of gas port, arranges four gas ports and can meet air-flow abundance in air guide seam.In addition, experimentally found that the width that air guide is stitched is 0.5 ~ 1.0 mm; When the width of gas port is 0.8 ~ 1.5 mm, the effect of anti-dross is better.
Be earthenware in mozzle, outer is metal tube, tamp with magnesia between earthenware and metal tube, can avoid the mozzle directly made by boron nitride or pottery etc. like this in atomization process, because in be heated suddenly when atomization starts inequality or atomization process, air-flow is unstable, occur the phenomenon of fracture, mozzle internal diameter is 4 ~ 8mm.The more anti-sticking device of catheter should have certain overhang bottom, when avoiding occurring little dross in atomization process, dross can not be stuck in the small gaps between mozzle and anti-sticking device, affects anti-adhesion effects, and stretching out anti-sticking device partial-length according to practical experience catheter is 2 ~ 3mm.
The invention has the beneficial effects as follows, the present invention establishes air guide to stitch between mozzle and nozzle circumferential weld, good antiseized effect can be played, this air guide seam uses the gases at high pressure of air cavity inside, structure is simple, and high pressure draught can blow off and be bonded at the metal liquid of mozzle lower end, prevents mozzle lower metal liquid dross well, avoid the blocking of mozzle, anti-adhesion effects is remarkable.
Accompanying drawing explanation
Fig. 1 represents the sectional view of a kind of non-fouling nozzle device provided by the invention.
Fig. 2 represents the scanning electron microscope (SEM) photograph of metal dust prepared by embodiment 1.
Fig. 3 represents the grain size distribution of metal dust prepared by embodiment 1.
Fig. 4 represents the sectional view of another kind of non-fouling nozzle device provided by the invention.
Fig. 5 represents the scanning electron microscope (SEM) photograph of metal dust prepared by embodiment 2.
Fig. 6 represents the grain size distribution of metal dust prepared by embodiment 2.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment 1
The non-fouling nozzle device that the present embodiment provides a kind of gas atomization to prepare metal dust, as shown in Figure 1, comprise mozzle 1 and be positioned at the air cavity 2 around mozzle 1, air cavity 2 connects air inlet pipe 3, air cavity 2 establishes nozzle circumferential weld 4 along the surrounding of mozzle 1 lower end; Air guide seam 5 is arranged around mozzle 1, the chamber wall of air cavity 2 is established and stitches 5 gas ports be communicated with 6 with air guide, to set up defences between air cavity 2 and mozzle 1 sticking device 7, air guide seam 5 is formed between air cavity 2 and anti-sticking device 7, Open Side Down for air guide seam 5, the connectivity part that gas port 6 and air guide stitch 5 establishes surge chamber 8, and the chamber wall of air cavity 2 is uniformly distributed four gas ports 6.The seam of air guide seam is wide is 0.6 mm; The aperture of gas port is 1.0 mm; Atomization angle is 50 °; Mozzle internal diameter is 4.1mm.Carry out the spray test of powder for being atomized object with 304L stainless steel, tested alloys is 50kg, and atomization temperature is 1600 DEG C, and atomizing pressure is 4.5MPa.After atomization, powder is carried out granulometry, the particle mean size d50 of powder is about 27 μm, and atomization process is smooth, mozzle occurs without dross, and as shown in Figure 2, size distribution as shown in Figure 3 for its powder electron scanning micrograph, the metal dust obtained is spherical substantially, and size distribution is concentrated.
Embodiment 2
The non-fouling nozzle device that the present embodiment provides another kind of gas atomization to prepare metal dust, as shown in Figure 4, structure is identical with the non-fouling nozzle device provided in embodiment 1, difference is only: the airflow line of atomizer has Lavalle (Laval) nozzle structure feature, nozzle ring seam is designed to first shrink further expansion, make the speed of the gas sprayed to exceed the velocity of sound, improve the nebulization efficiency of molten metal.The width of air guide seam is 0.6 mm; The width of gas port is 1.0 mm; Atomization angle is 55 °; Mozzle internal diameter is 4.0mm.Carry out the spray test of powder for being atomized object with 304L stainless steel, tested alloys is 50kg, and atomization temperature is 1600 DEG C, and atomizing pressure is 4.0MPa.After atomization, powder is carried out granulometry, the particle mean size d50 of powder is about 18 μm, and atomization process is smooth, and mozzle occurs without dross.As shown in Figure 5, as shown in Figure 6, the metal dust obtained is spherical to size distribution to its powder electron scanning micrograph substantially, and powder size is thin, and distribution is concentrated, and nebulization efficiency significantly improves.
Claims (10)
1. a gas atomization prepares the non-fouling nozzle device of metal dust, comprise mozzle (1) and be positioned at mozzle (1) air cavity (2) around, air cavity (2) connects air inlet pipe (3), establishes the nozzle circumferential weld (4) be communicated with air cavity (2) around the lower end of mozzle (1); It is characterized in that, between air cavity (2) and mozzle (1), establish air guide seam (5) around mozzle (1), the opening of air guide seam (5) is positioned between mozzle (1) and nozzle circumferential weld (4); The chamber wall of air cavity (2) is established the gas port (6) stitching (5) with air guide and be communicated with.
2. non-fouling nozzle device as claimed in claim 1, it is characterized in that, sticking device of setting up defences between air cavity (2) and mozzle (1) (7), forms air guide seam (5) between air cavity (2) and anti-sticking device (7).
3. non-fouling nozzle device as claimed in claim 1 or 2, is characterized in that, the connectivity part that (5) are stitched in gas port (6) and air guide establishes surge chamber (8).
4. non-fouling nozzle device as claimed in claim 1 or 2, is characterized in that, the chamber wall of air cavity (2) is uniformly distributed four gas ports (6).
5. non-fouling nozzle device as claimed in claim 1 or 2, is characterized in that, the width of air guide seam (5) is 0.5 ~ 1.0 mm.
6. non-fouling nozzle device as claimed in claim 1 or 2, it is characterized in that, the width of gas port (6) is 0.8 ~ 1.5mm.
7. non-fouling nozzle device as claimed in claim 1 or 2, it is characterized in that, the internal diameter of mozzle (1) is 4 ~ 8mm.
8. non-fouling nozzle device as claimed in claim 1 or 2, it is characterized in that, atomization angle α is 45 ° ~ 60 °, and described atomization angle α is the angle that the center line of nozzle circumferential weld (4) is formed.
9. non-fouling nozzle device as claimed in claim 1 or 2, is characterized in that, mozzle (1) comprises outer tube and is placed in the interior pipe composition of outer tube, and outer tube is metal tube, and interior pipe is earthenware, fills between outer tube and interior pipe with magnesia.
10. non-fouling nozzle device as claimed in claim 1 or 2, it is characterized in that, the length that the part of anti-sticking device (7) bottom is stretched out in mozzle (1) bottom is 2 ~ 3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510311156.6A CN104858442B (en) | 2015-06-09 | 2015-06-09 | A kind of gas atomization prepares the non-fouling nozzle device of metal dust |
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| CN201510311156.6A CN104858442B (en) | 2015-06-09 | 2015-06-09 | A kind of gas atomization prepares the non-fouling nozzle device of metal dust |
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| CN104858442A true CN104858442A (en) | 2015-08-26 |
| CN104858442B CN104858442B (en) | 2017-09-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106623954A (en) * | 2016-12-29 | 2017-05-10 | 深圳微纳增材技术有限公司 | Metal liquid droplet atomization protecting gas hood |
| CN106735268A (en) * | 2016-12-16 | 2017-05-31 | 南通金源智能技术有限公司 | Preparation method for reducing the 3D printing metal powder material of hollow powder |
| CN109806988A (en) * | 2019-04-13 | 2019-05-28 | 江苏华威机械制造有限公司 | A kind of metal bath jet deposition atomizer for preventing dross from gaging somebody |
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| CN109806988A (en) * | 2019-04-13 | 2019-05-28 | 江苏华威机械制造有限公司 | A kind of metal bath jet deposition atomizer for preventing dross from gaging somebody |
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| CN104858442B (en) | 2017-09-29 |
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Address after: 410000 Hunan province Changsha City Economic Development Zone Lang Li Jia Street Road No. 9 Patentee after: HUNAN METALLURGY MATERIAL INSTITUTE Co.,Ltd. Address before: 410014 Hunan province Changsha City Economic and Technological Development Zone Lang Li Jia Street Road No. 9 Patentee before: HUNAN METALLURGY MATERIAL INSTITUTE |