CN101899282A - Preparation method of pneumatic atomizing rapid condensation magnetic abrasive material - Google Patents
Preparation method of pneumatic atomizing rapid condensation magnetic abrasive material Download PDFInfo
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- CN101899282A CN101899282A CN2010102064086A CN201010206408A CN101899282A CN 101899282 A CN101899282 A CN 101899282A CN 2010102064086 A CN2010102064086 A CN 2010102064086A CN 201010206408 A CN201010206408 A CN 201010206408A CN 101899282 A CN101899282 A CN 101899282A
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Abstract
The invention provides a preparation method of pneumatic atomizing rapid condensation magnetic abrasive material. The preparation method includes the following steps: (1) pneumatic atomizing rapid condensation powder preparation equipment is improved, a high pressure air current nozzle adopts ceramic high-abrasive material, a powder mixing device is added in a gas circuit, so that the high pressure air current is mixed with hard abrasive material powder before ejecting and gas-solid two-phase flow is formed; metal material with strong soft magnetism is adopted as organism material of magnetic abrasive material and is heated to be in molten state; (2) a high pressure air current switch is turned on, so that the gas-solid flow is ejected from the high pressure air current nozzle, an electric furnace is operated to cause the organic material in molten state to be ejected from a liquid metal nozzle; at the moment after the organic material is ejected, hard abrasive material powder is forced to be injected under the action of the high pressure gas-solid flow, the organic material containing the hard abrasive material powder is rapidly atomized into micro drops, and rapid cooling is carried out, thus obtaining granular magnetic abrasive material powder. The invention has high production efficiency and low cost, and the prepared magnetic abrasive material has good performances, thus being applicable to batch production.
Description
Technical field
The invention provides a kind of preparation method of pneumatic atomizing rapid condensation magnetic abrasive material, belong to the magnetic grinding magnetic abrasive preparing technical field of mechanical component precise finishing work range.
Background technology
Product surface quality more and more comes into one's own, and the processing of magnetic grinding polishing is to improve the effectively technique means of product surface quality.There is plurality of advantages technically in this method: flexibility, adaptivity, self-sharpening, controllability, temperature rise is little and need not carry out tool wear compensation, need not correction of the flank shape etc. characteristics; Also avoided complicated requirement simultaneously, can realize complex-curved grinding polishing processing and solve automation issues the grinding tool head construction; And can reduce the manufacturing cost of part, thereby caused in the world and pay close attention to widely and study.Magnetic abrasive plays critical effect as the grinding tool of magnetic grinding polishing processing in this kind working method.The nonferromagnetic substance of magnetic abrasive and work-ing life and its technology of preparing are closely related, thereby the technology of preparing of magnetic abrasive becomes the key problem of magnetic grinding polishing Processing Technology Development.
Both at home and abroad the researchist mainly contains mull technique, sintering process (normal pressure-sintered method, hot-pressing sintering method, laser sintered method), plasma powder scorification, mechanical mixing etc. in the magnetic abrasive multiple preparation method that prepared aspect developing.
It is that certain proportion, the ferromagnetic powder that mixes and abrasive powders are bonded together with binding agent that mull technique prepares magnetic abrasive, and varigrained magnetic abrasive powder is made in curing then, mechanical disintegration, screening.This method technology is simple, realizes that easily cost is lower; But tissue looseness, in conjunction with poor, density is low, poor heat stability, abrasive particle comes off mutually easily, the life-span is short, and at process zone when temperature is higher, the agglutinating magnetic abrasive makes the piece surface of processing become furvous, pollutes easily and damages original finished surface.
Sintering process prepare magnetic abrasive be will anticipate ferromagnetic powder that cooperates by a certain percentage and abrasive powders be pressed into pressed compact after mixing with higher density; under certain atmosphere protection; heating, sintering; the hard abrasive material is incorporated in the iron-based body of magnetic conduction; after reaching necessary mechanical strength, sintered compact is carried out mechanical disintegration, obtains by screening.Because this method prepares magnetic abrasive and all needs mechanical disintegration, has the abrasive particle of considerable part to be separated with ferromagnetic in this process, cause the ferromagnetic intensity that combines with abrasive particle to reduce, durability descends; On the other hand, because of the Mechanical Crushing effect, make the particle shape of magnetic abrasive of preparation all irregular, cause the piece surface grinding degree of depth in the process of lapping inconsistent, limit improving of quality of work piece surface, also limited the range of application of this kind magnetic abrasive, and the suitable difficulty of hard briquet mechanical disintegration process behind the sintering, the manufacturing cost height is difficult to produce in batches.
The plasma powder scorification prepares magnetic abrasive and needs complex apparatus such as plasma generator, pumped vacuum systems, powder mixes device, and preparation technology is very complicated, and yield poorly (per hour can only produce tens grams), cost is very high, is not suitable for producing in batches.
The magnetic abrasive of mechanical mixing preparation is that ferromagnetic powder and abrasive powders are mixed, and adds directly use after the lapping liquid, because of ferromagnetic and abrasive particle separate easily mutually, can only be applicable to simple application scenario.
From grinding theoretical and friction angle analysis, ideal grinding abrasive shape should be a spheric, and hard abrasive grain uniformly distributes on its top layer.And the magnetic abrasive of aforesaid mull technique and sintering process preparation because of there being many shortcoming and defect, is difficult to satisfy the production service requirements.For promoting the development of Magnetic Force Grinding Technology, satisfy the ever-increasing needs more and more higher to the product surface quality requirement, must explore the spherical magnetic abrasive of the new high-quality that preparation is easy, with low cost, production efficiency is high, nonferromagnetic substance is good.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can overcome above-mentioned defective, preparation is easy, with low cost, production efficiency is high, nonferromagnetic substance is good preparation method of pneumatic atomizing rapid condensation magnetic abrasive material.Its technical scheme is:
A kind of preparation method of pneumatic atomizing rapid condensation magnetic abrasive material, it is characterized in that adopting following steps: improve traditional pneumatic atomizing rapid condensation powder manufacturing apparatus (1), the high pressure draft nozzle adopts the ceramic wear-resisting material, increase a hard abrasive powders in the gas circuit before the high pressure draft nozzle and sneak into device, make high pressure draft before ejection, sneak into the hard abrasive powders and be uniformly mixed to form Dual-Phrase Distribution of Gas olid; Select metallic substance or metal alloy compositions with strong soft magnetism for use, the organism material as magnetic abrasive is heated to molten state; (2) open the high pressure draft switch, make gas-solid two-phase high pressure draft from the ejection of high pressure draft nozzle, the operation electric furnace makes the organism material of molten state spray from the metal liquid stream nozzle; Under the effect of gas-solid two-phase high pressure draft, the organism material of molten state is in the moment after the ejection of metal liquid stream nozzle, the hard abrasive powders is injected by force, is mixed, the organism material that contains the molten state of hard abrasive powders then is rapidly atomized into fine droplet, forms granular magnetic abrasive powder through cooling off fast.
Its principle of work is: the present invention is on the basis of conventional metals aerosolization powder manufacturing apparatus, mix the powder device by in gas circuit, increasing, make high pressure gas before ejection, sneak into the hard abrasive powders, spray to metal liquid stream then from the molten state of metal liquid stream nozzle ejection.The moment of metal liquid stream behind jetting nozzle, under the effect of the high pressure draft that is mixed with the hard abrasive powders, the hard abrasive powders is injected by force and is mixed, and the molten metal that contains the hard abrasive powders then is rapidly atomized into fine droplet, forms granular magnetic abrasive through cooling off fast.
The present invention compared with prior art, its advantage is:
1, the pneumatic atomizing rapid condensation principle is applied to the preparation of magnetic abrasive, makes molten metal and hard abrasive material that wettability is very poor forcibly to combine, prepare the very high magnetic abrasive of bonding strength, preparation technology is simple;
2, the magnetic abrasive of the present invention preparation have that good spherical form structure, hard abrasive grain are evenly distributed at the magnetic abrasive particle surface, the remarkable advantage of bonding strength height, long service life, have purposes widely in technical field of precise finishing machining.
3, the present invention be a kind of can be in enormous quantities, the effective ways of high-level efficiency, low cost production high-quality magnetic abrasive, have highly application value.
Description of drawings
Fig. 1 is the ideal structure model diagram of magnetic abrasive;
Fig. 2 is the magnetic abrasive particulate 150x pattern SEM picture that the present invention prepares;
Fig. 3 is the magnetic abrasive particulate 400x pattern SEM picture that the present invention prepares.
Embodiment
Embodiment: organism material adopts the iron-silicon-aluminum soft magnet material alloys, and the hard abrasive powders is selected 400 purpose Al for use
2O
3Abrasive powders, as atomizing gas, gaseous tension is controlled at 1.OMPa with nitrogen.Concrete steps are:
(1) traditional pneumatic atomizing rapid condensation powder manufacturing apparatus is improved, the high pressure draft nozzle adopts the ceramic wear-resisting material, increase an enforceable hard abrasive powders in the gas circuit before the high pressure draft nozzle and sneak into device, make high pressure draft before ejection, sneak into the hard abrasive powders and be uniformly mixed to form Dual-Phrase Distribution of Gas olid; With electric furnace organism material is heated to molten state;
(2) open the high pressure draft switch, make gas-solid two-phase high pressure draft from the ejection of high pressure draft nozzle, the operation electric furnace makes the organism material of molten state spray from the metal liquid stream nozzle.Under the effect of gas-solid two-phase high pressure draft, the organism material of molten state is in the moment after the ejection of metal liquid stream nozzle, the hard abrasive powders is injected by force and is mixed, the organism material that contains the molten state of hard abrasive powders then is rapidly atomized into fine droplet, forms granular magnetic abrasive powder through cooling off fast.
Scanning electron microscope picture such as Fig. 2, shown in Figure 3 of the magnetic abrasive particle material object of preparation, Fig. 2 amplify 150 times scanning electron microscope picture, and Fig. 3 amplifies 400 times scanning electron microscope picture.By comparing with ideal magnetic abrasive grain pattern model, as can be seen: the magnetic abrasive grain pattern and the ideal magnetic abrasive grain pattern of the present invention's preparation match.
Claims (1)
1. preparation method of pneumatic atomizing rapid condensation magnetic abrasive material, it is characterized in that adopting following steps: improve traditional pneumatic atomizing rapid condensation powder manufacturing apparatus (1), the high pressure draft nozzle adopts the ceramic wear-resisting material, increase a hard abrasive powders in the gas circuit before the high pressure draft nozzle and sneak into device, make high pressure draft before ejection, sneak into the hard abrasive powders and be uniformly mixed to form Dual-Phrase Distribution of Gas olid; Select metallic substance or metal alloy compositions with strong soft magnetism for use, the organism material as magnetic abrasive is heated to molten state; (2) open the high pressure draft switch, make gas-solid two-phase high pressure draft from the ejection of high pressure draft nozzle, the operation electric furnace makes the organism material of molten state spray from the metal liquid stream nozzle; Under the effect of gas-solid two-phase high pressure draft, the organism material of molten state is in the moment after the ejection of metal liquid stream nozzle, the hard abrasive powders is injected by force, is mixed, the organism material that contains the molten state of hard abrasive powders then is rapidly atomized into fine droplet, forms granular magnetic abrasive powder through cooling off fast.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102250584A (en) * | 2011-06-11 | 2011-11-23 | 山东理工大学 | Equipment for preparing atomized quick-setting magnetic abrasive |
| CN102277132A (en) * | 2011-06-11 | 2011-12-14 | 山东理工大学 | Structural form control method for preparing magnetic grinding materials by air atomization quick-setting process |
| CN102328091A (en) * | 2011-06-11 | 2012-01-25 | 山东理工大学 | Powder feeding and mixing device for preparing magnetic grinding material through atomization and rapid solidification and powder feeding and mixing method |
| CN110000718A (en) * | 2019-03-20 | 2019-07-12 | 广东工业大学 | A kind of polishing preparation facilities and preparation method of composite particles |
| CN110125826A (en) * | 2019-05-05 | 2019-08-16 | 华侨大学 | A kind of preparation method and device of hedgehog abrasive grain group |
| CN110253029A (en) * | 2019-06-21 | 2019-09-20 | 燕山大学 | A kind of granule enhancement type pre-alloyed powder and the preparation method and application thereof |
| CN112280535A (en) * | 2020-10-29 | 2021-01-29 | 兰州理工大学 | Spherical magnetic abrasive and preparation method thereof |
| CN113150743A (en) * | 2021-04-19 | 2021-07-23 | 山东理工大学 | Method for preparing fast-setting magnetic abrasive by combining brazing enhanced plasma molten metal micro-droplets and abrasive powder |
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| US20030000150A1 (en) * | 2000-10-02 | 2003-01-02 | Terunori Ito | Cerium based abrasive material and method for producing cerium based abrasive material |
| CN101481597A (en) * | 2009-01-17 | 2009-07-15 | 山东理工大学 | Normal atmosphere sintering method for magnetic grinding medium |
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2010
- 2010-06-23 CN CN2010102064086A patent/CN101899282A/en active Pending
Patent Citations (2)
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| US20030000150A1 (en) * | 2000-10-02 | 2003-01-02 | Terunori Ito | Cerium based abrasive material and method for producing cerium based abrasive material |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102250584A (en) * | 2011-06-11 | 2011-11-23 | 山东理工大学 | Equipment for preparing atomized quick-setting magnetic abrasive |
| CN102277132A (en) * | 2011-06-11 | 2011-12-14 | 山东理工大学 | Structural form control method for preparing magnetic grinding materials by air atomization quick-setting process |
| CN102328091A (en) * | 2011-06-11 | 2012-01-25 | 山东理工大学 | Powder feeding and mixing device for preparing magnetic grinding material through atomization and rapid solidification and powder feeding and mixing method |
| CN102250584B (en) * | 2011-06-11 | 2014-03-26 | 山东理工大学 | Equipment for preparing atomized quick-setting magnetic abrasive |
| CN110000718A (en) * | 2019-03-20 | 2019-07-12 | 广东工业大学 | A kind of polishing preparation facilities and preparation method of composite particles |
| CN110000718B (en) * | 2019-03-20 | 2021-05-28 | 广东工业大学 | Preparation device and preparation method of composite particles for polishing |
| CN110125826A (en) * | 2019-05-05 | 2019-08-16 | 华侨大学 | A kind of preparation method and device of hedgehog abrasive grain group |
| CN110253029A (en) * | 2019-06-21 | 2019-09-20 | 燕山大学 | A kind of granule enhancement type pre-alloyed powder and the preparation method and application thereof |
| CN112280535A (en) * | 2020-10-29 | 2021-01-29 | 兰州理工大学 | Spherical magnetic abrasive and preparation method thereof |
| CN112280535B (en) * | 2020-10-29 | 2021-05-25 | 兰州理工大学 | Spherical magnetic abrasive and preparation method thereof |
| CN113150743A (en) * | 2021-04-19 | 2021-07-23 | 山东理工大学 | Method for preparing fast-setting magnetic abrasive by combining brazing enhanced plasma molten metal micro-droplets and abrasive powder |
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Application publication date: 20101201 |