CN1212212C - One-step gas atomization iron powder - Google Patents
One-step gas atomization iron powder Download PDFInfo
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- CN1212212C CN1212212C CN 200310106113 CN200310106113A CN1212212C CN 1212212 C CN1212212 C CN 1212212C CN 200310106113 CN200310106113 CN 200310106113 CN 200310106113 A CN200310106113 A CN 200310106113A CN 1212212 C CN1212212 C CN 1212212C
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Abstract
The present invention relates to a manufacturing method of one-step gas atomization iron powder in a non-oxidizing gas atmosphere with certain pressure and also relates to a gas atomization system, which belongs to the technical field of metal material. The manufacturing method comprises the following processing steps that 1) iron or steel raw material and alloy elements with corresponding quantity according to product requirements are thrown into a melting furnace to melt into iron liquor which is poured into a molten iron tundish; 2) the molten iron tundish sends the iron liquor to the air atomization system in the non-oxidizing gas atmosphere. The system comprises the following procedures that a, the iron liquor is firstly poured into a molten iron atomizing bag and is heated and insulated to moderate temperature in the molten iron atomizing bag; b, a molten iron bag platform moving nozzle is butted with an atomizer; c, the high-pressure non-oxidizing gas atmosphere enters the atomizer, the iron liquor enters the nozzle, the atomizer sprays powder to the iron liquor, the sprayed powder falls into a material collector at the lower side of an atomizing chamber and enters to a semi-finished product storage tank via a material conveying pipe, and iron powder finished products are output to various finished product storage tanks via a vibrating screen according to the grain sizes of the sprayed powder.
Description
Technical field
The present invention relates to the manufacture method and the relevant aerosolization system of one-step method aerosolization iron powder in having the non-oxidized gas environment of certain pressure, belong to the metal material technical field.
Background technology
The high strength part of powder metallurgy iron powder compacting has the good characteristic that favorable mechanical performance and less machining just can reach the higher dimensional required precision, the manufacturing industry that parts mechanical strength and dimensional accuracy are had higher requirements as: enterprises such as household electrical appliances, automobile, space flight and aviation, military project more and more widely to the use of this technology, the auto industry material that more is absolutely necessary particularly.Powdered metallurgical material in the U.S. 60%～70%, Japan 70%～80% is used for auto industry, nearly 500,000 tons of the annual iron powder that consumes of beautiful, day two countries, and the used powdered metal parts of each kart has reached kind more than 120, and weight has reached more than 20 kilogram.At present China compares with regard to this technology and advanced foreign technology and also has the production technology of certain distance, especially iron powder to have certain problem, and the higher used powdered metal parts gross weight of kart of the localization rate of parts and components only reaches 5 kilograms, only is equivalent to external 1/4.The manufacturing process of iron powder used in metallurgy generally adopts ball-milling method and water smoke method now, and ball-milling method is in ball mill iron to be ground into iron powder, and the top layer of iron powder is oxidized in the process of grinding, and also needs to make iron powder through the reduction operation again; The water smoke method be will fusing molten iron change into powder through high-pressure water mist, iron also can be oxidized in atomization process because of containing the aerobic essence in the hydrone, makes iron powder so also need reduce operation.The manufacture method of two kinds of above-mentioned iron powders has all needed multiple working procedure, particularly reduce operation, because of the metal activity of iron strong, easily oxidation, the operation of usually need reducing together incessantly just can make satisfactory iron powder, and reduction reaction generally is to heat to carry out in the environment of reducing atmosphere, can produce the part diffusion bonding between the ferrous powder granules, and have certain adhesion strength, so need after the reduction operation broken process that the powder that has condensed is carried out fragmentation.Therefore, the manufacture method of above-mentioned two kinds of iron powders all exists production process more, and the production cycle is longer relatively, and cost is also high, all deficiencies that the mechanical performance of iron powder is difficult to guarantee.
Summary of the invention
Main purpose of the present invention is the deficiency at above-mentioned existence, proposes a kind of manufacture method of one-step method aerosolization iron powder, makes work simplification, and cost reduces, and above-mentioned purpose is achieved by following technical proposals.
1, manufacture method comprises following process steps:
1) drops into smelting furnace with iron or steel raw material and according to the alloying element of the needed respective amount of product requirement, fuse into iron liquid, and pour the molten iron tundish into;
2) by the molten iron tundish iron liquid is sent into aerosolization system in the non-oxidizing atmosphere, the non-oxidizing atmosphere of this system accounts for the total atmosphere content of system should be no less than 99.99%, non-oxidizing atmosphere pressure is 30～1500Pa, and finishes following work step in said system:
A. iron liquid is at first poured molten iron atomizing bag into and is heated at molten iron atomizing bag and is incubated to proper temperature;
B. the ladle platform moves, and the nozzle of the molten iron pipe front end of one side is docked with the atomizer of spray chamber front end, and the temperature of spray chamber is controlled at below 300 ℃;
C. the gate valve on the high pressure admission pipeline, the high pressure non-oxidizing atmosphere enters atomizer, iron liquid enters nozzle through the molten iron pipe of molten iron atomizing bag, atomizer dusts to iron liquid, dusting falls into the loading head of spray chamber downside, enters the semi-finished product basin through feed pipe, delivers to vibrating screen classifier through feed pipe again, vibrating screen classifier is exported the iron powder finished product to all kinds of finished product basins by the granular size classification of dusting by feed pipe.
2, the manufacture method of one-step method aerosolization iron powder according to claim 1 is characterized in that described non-oxidizing atmosphere is a nitrogen atmosphere.
The aerosolization system of one-step method aerosolization iron powder, it is characterized in that it comprises high pressure non-oxidizing atmosphere preparation facilities, atomising device, finished product collection device, dedusting heat abstractor and the cooling duct that is connected above-mentioned each device, feed appliance, air inlet pipe, blast pipe and the gate valve on above-mentioned each pipeline relevant position, described high pressure non-oxidizing atmosphere preparation facilities, comprise air compressor machine, the non-oxidizing atmosphere generator, supercharger, wherein: escape pipe connects the inlet end of air compressor machine, the inlet end of nonoxidizing atmosphere generator is connected with the outlet side of air compressor machine, its exhaust end connects the air inlet of supercharger and the air inlet of the deduster in the dedusting heat abstractor, and the outlet side of supercharger is by the atomizer air inlet in the high-pressure air pipe connection aerosolization device; Described aerosolization device, comprise the ladle platform, the atomizing ladle, nozzle, atomizer, spray chamber, loading head, air inlet, exhaust outlet, air inlet and air outlet, wherein: molten iron atomizing bag places on the ladle platform, iron pipe places a side of molten iron atomizing bag and is communicated with it, nozzle places the front end of iron pipe, atomizer and air inlet place the front end of spray chamber, the ladle platform moves realizes that butt joint is connected nozzle with atomizer, loading head places the spray chamber downside to be connected by the semi-finished product basin of feed appliance and finished product collection device, the spray chamber rear end is equipped with the air inlet of air outlet by the separator in cooling duct and the dedusting heat abstractor and is connected several air inlets, exhaust outlet respectively and air inlet pipe, blast pipe connects; Described finished product collection device comprises feed appliance, semi-finished product basin, finished product basin and screening machine, and wherein: the semi-finished product basin is by the feed end of feed appliance connection screening machine, and the discharge end of screening machine connects the finished product basin by feed appliance; Described dedusting heat abstractor comprises gas, grain separator, deduster, radiator, blower fan, wherein: the exhaust outlet of gas, grain separator and deduster is connected blast pipe, its both air outlet connects cooling duct, its both lower end is connected with semi-finished product basin in the finished product collection device by feed appliance respectively, is equipped with blower fan and radiator on cooling duct.
Description of drawings
Accompanying drawing 1 is the process equipment structural representation of the embodiment of the invention
1 is hot-metal insulating atomizing bag among the figure, the 2nd, and ladle platform, the 3rd, atomizer, the 4th, nozzle, the 5th, spray chamber, the 7th, gas, grain separator, the 8th, radiator, the 9th, deduster, the 10th, semi-finished product basin, the 11st, air compressor machine, the 12nd, nitrogen making machine, the 13rd, supercharger, the 14th, water pump, 15 spray chamber air inlets, the 18th, cooling water pipe, the 19th, air inlet pipe, the 20th, blast pipe, the 21st, cooling duct, the 23rd, vibrating screen classifier, the 24th, finished product basin, the 26th, blower fan, the 27th, gate valve, 28 high-pressure air pipes, 29 loading heads, the 30th, air valve, little nitrogen making machine 31.
The specific embodiment
Non-oxidizing atmosphere in the aerosolization system that present embodiment relates to is a nitrogen atmosphere; whole system all is in the nitrogen atmosphere; requiring the content of nitrogen in system is 99.99%; be the purity of nitrogen in the assurance system, when system is out of service, keep this system's nitrogen atmosphere pressure-fired; in case air enters; so a little nitrogen making machine 31 is set in the present embodiment, behind system-down, constantly supplies nitrogen, referring to accompanying drawing to system.Will be before the start to atomization system inflated with nitrogen deoxidation once more, therefore be provided with inlet and outlet loop before the start of forming by air inlet pipeline and gas exhaust piping, its air inlet pipeline is drawn the air inlet (in accompanying drawing dotted line shown in circuit) of air inlet pipe 19 to deduster 9 by the port of export of air compressor machine 11, connect loading head 10 gentle, grain separators 7 by an arm in air inlet pipe 19 ways, make nitrogen enter system; Its gas exhaust piping is drawn the inlet end (in accompanying drawing chain-dotted line shown in circuit) of blast pipe 20 to air compressor machine by the exhaust outlet of deduster 9, in the pipeline of blast pipe 20, connect spray chamber 5 gentle, grain separators 7, make the gas in the original system discharge system by 3 arms.Before the start, at first make air compressor machine 11 and nitrogen making machine 12 work in the high pressure non-oxidizing atmosphere preparation facilities, the nitrogen that nitrogen making machine 12 produces enters spray chamber 6, gas, grain separator 7, deduster 9 by air inlet pipe 19 and each arm, exhaust branch pipe by their upper ends enters blast pipe 20 again, the inlet end that enters air compressor machine 11 is at last finished the circulation of inlet and outlet, each circulation all can make oxygen reduce, nitrogen increases, and so carries out repeatedly such circulation and makes nitrogen content of system reach requirement greater than 99.99%.
Present embodiment is the preparation straight iron powder.So at first raw material-iron is dropped into smelting furnace, be heated to 1450 ℃ and make it to be molten into fully iron liquid, pour this iron liquid into the molten iron tundish, by the molten iron tundish iron liquid is sent into the aerosolization system.
This moment, atomization system was started shooting, and air compressor machine 11 is delivered to nitrogen making machine 12 with intrasystem gas (nitrogen content has reached 99.99%), and through supercharger 13 superchargings, nitrogen pressure reaches 30～150Pa, and this high pressure nitrogen enters atomizer 3 through high pressure gas pipeline 28 and air valve 30.
Iron liquid at first enters the molten iron atomizing bag 1 of atomising device, because of iron liquid temperature in transfer process can reduce, so atomizing bag 1 needs the heating of iron liquid, insulation, the iron liquid that the molten iron tundish is successively sent into reaches the molten condition about 1450 ℃, and ladle platform 2 is done space three-dimensional and moved to make with the nozzle and the atomizer 6 of the iron pipe front end of molten iron atomizing bag one side and accurately dock.Open the air valve 30 on the high-pressure pipe 28 this moment, and high pressure nitrogen enters atomizer 3, and 3 pairs of iron liquid of atomizer dust, and dusting falls in the loading head 29 of spray chamber 6 downsides, sends into semi-finished product basin 10 by feed pipe 22.Particle is less, lighter iron powder, enter gas from the air outlet of spray chamber 6 rear ends through cooling duct 21 with gas, grain separator 7 separates, iron powder falls into the semi-finished product basin 10 of lower end, gas is then by gas, grain separator 7 upper end air outlets enter cooling duct, at gas, be equipped with radiator 8 near grain separator 7 air outlets the cooling duct, this radiator 8, water pipe 18 and water pump 14 connect into a circulation waterway (circuit shown in the double dot dash line in the accompanying drawing), pump constantly delivers to 8 with the water of cooling, carry out heat exchange, scorching hot gas is cooled off by radiator 8 in this section pipeline, cooling, deliver in the spray chamber 6 by the air inlet 15 of spray chamber front end at last, make spray chamber be cooled to 60～200 ℃.Two blower fans 26 are separately positioned on the air outlet and near the cooling duct the spray chamber front end air inlet of gas, grain separator 7, so that wind-force to be provided.Iron powder in the semi-finished product basin 10 is delivered to the screening that vibrating screen classifier 23 carries out by granular size through feed pipe 22 again, delivers to all kinds of finished granule basins 24 by feed pipe 22 at last.
Claims (3)
1, the manufacture method of one-step method aerosolization iron powder is characterized in that comprising following process steps:
1) drops into smelting furnace with iron or steel raw material and according to the alloying element of the needed respective amount of product requirement, fuse into iron liquid, and pour the molten iron tundish into;
2) by the molten iron tundish iron liquid is sent into aerosolization system in the non-oxidizing atmosphere, the non-oxidizing atmosphere of this system accounts for the total atmosphere content of system should be no less than 99.99%, non-oxidizing atmosphere pressure is 30～1500Pa, and finishes following work step in said system:
A. iron liquid is at first poured molten iron atomizing bag into and is heated at molten iron atomizing bag and is incubated to proper temperature;
B. the ladle platform moves, and the nozzle of the molten iron pipe front end of one side is docked with the atomizer of spray chamber front end, and the temperature of spray chamber is controlled at below 300 ℃;
C. open the gate valve on the high pressure admission pipeline, the high pressure non-oxidizing atmosphere enters atomizer, iron liquid enters nozzle through the molten iron pipe of molten iron atomizing bag, atomizer dusts to iron liquid, dusting falls into the loading head of spray chamber downside, enters the semi-finished product basin through feed pipe, delivers to vibrating screen classifier through feed pipe again, vibrating screen classifier is exported the iron powder finished product to all kinds of finished product basins by the granular size classification of dusting by feed pipe.
2, the manufacture method of one-step method aerosolization iron powder according to claim 1 is characterized in that described non-oxidizing atmosphere is a nitrogen atmosphere.
3, the aerosolization system of one-step method aerosolization iron powder, it is characterized in that it comprises high pressure non-oxidizing atmosphere preparation facilities, atomising device, finished product collection device, dedusting heat abstractor and the cooling duct that is connected above-mentioned each device, feed appliance, air inlet pipe, blast pipe and the gate valve on above-mentioned each pipeline relevant position, described high pressure non-oxidizing atmosphere preparation facilities, comprise air compressor machine, the non-oxidizing atmosphere generator, supercharger, wherein: escape pipe connects the inlet end of air compressor machine, the inlet end of nonoxidizing atmosphere generator is connected with the outlet side of air compressor machine, its exhaust end connects the air inlet of supercharger and the air inlet of the deduster in the dedusting heat abstractor, and the outlet side of supercharger is by the atomizer air inlet in the high-pressure air pipe connection aerosolization device; Described aerosolization device, comprise the ladle platform, the atomizing ladle, nozzle, atomizer, spray chamber, loading head, air inlet, exhaust outlet, air inlet and air outlet, wherein: molten iron atomizing bag places on the ladle platform, iron pipe places a side of molten iron atomizing bag and is communicated with it, nozzle places the front end of iron pipe, atomizer and air inlet place the front end of spray chamber, the ladle platform moves realizes that butt joint is connected nozzle with atomizer, loading head places the spray chamber downside to be connected by the semi-finished product basin of feed appliance and finished product collection device, the spray chamber rear end is equipped with the air inlet of air outlet by the separator in cooling duct and the dedusting heat abstractor and is connected several air inlets, exhaust outlet respectively and air inlet pipe, blast pipe connects; Described finished product collection device comprises feed appliance, semi-finished product basin, finished product basin and screening machine, and wherein: the semi-finished product basin is by the feed end of feed appliance connection screening machine, and the discharge end of screening machine connects the finished product basin by feed appliance; Described dedusting heat abstractor comprises gas, grain separator, deduster, radiator, blower fan, wherein: the exhaust outlet of gas, grain separator and deduster is connected blast pipe, its both air outlet connects cooling duct, its both lower end is connected with semi-finished product basin in the finished product collection device by feed appliance respectively, is equipped with blower fan and radiator on cooling duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310106113 CN1212212C (en) | 2003-10-22 | 2003-10-22 | One-step gas atomization iron powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310106113 CN1212212C (en) | 2003-10-22 | 2003-10-22 | One-step gas atomization iron powder |
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| CN1537690A CN1537690A (en) | 2004-10-20 |
| CN1212212C true CN1212212C (en) | 2005-07-27 |
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| CN 200310106113 Expired - Fee Related CN1212212C (en) | 2003-10-22 | 2003-10-22 | One-step gas atomization iron powder |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US8357251B2 (en) * | 2010-07-30 | 2013-01-22 | United Technologies Corporation | Powder processing method |
| CN102303122B (en) * | 2011-08-26 | 2013-05-01 | 武汉中磁浩源科技有限公司 | Method for preparing high-resistivity iron-based alloy powder |
| CN103056374A (en) * | 2011-10-22 | 2013-04-24 | 湖南省冶金材料研究所 | Method for preparing prealloy powder for low-oxygen-content micro-diamond product and using ultrahigh-pressure water atomization |
| CN102689015B (en) * | 2012-06-21 | 2014-03-26 | 北京有色金属研究总院 | Metal powder preparation device and method therefor |
| CN103252499B (en) * | 2013-05-10 | 2015-10-28 | 武汉工程大学 | The preparation facilities that ferrum-based catalyst aerosolization is shaped and preparation technology |
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