CN105665721B - The twin-jet nozzle that freely lands mixes powder aerosolization water cooling and coagulates Metal Substrate chromium oxide magnetic abrasive preparation method soon - Google Patents
The twin-jet nozzle that freely lands mixes powder aerosolization water cooling and coagulates Metal Substrate chromium oxide magnetic abrasive preparation method soon Download PDFInfo
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- CN105665721B CN105665721B CN201610043103.5A CN201610043103A CN105665721B CN 105665721 B CN105665721 B CN 105665721B CN 201610043103 A CN201610043103 A CN 201610043103A CN 105665721 B CN105665721 B CN 105665721B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1436—Composite particles, e.g. coated particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/086—Cooling after atomisation
- B22F2009/0872—Cooling after atomisation by water
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Abstract
The twin-jet nozzle that freely lands mixes powder aerosolization water cooling and coagulates Metal Substrate chromium oxide magnetic abrasive preparation method soon, it is characterised in that：It is the alloy of iron, silicon, aluminium, four kinds of elements of copper composition that the hard abrasive material of magnetic abrasive, which uses chromium oxide powder, metal_based material,；Nozzle is freely landed nozzle using Dual-layer, and the upper layer nozzle that freely lands is that low pressure mixes powder jet nozzle, and nozzle is freely landed as high pressure draught nozzle in lower layer；The type of cooling is water cooling, by adjusting cooling water in the height of water level of atomization water cooling chamber, the cooling velocity containing chromium oxide abrasive material molten drop is controlled, to form the magnetic abrasive that chromium oxide abrasive material is distributed in magnetic abrasive Metal Substrate body surface shallow-layer；It send mixed powder to use spiral and send meal mixer, realize accurately controlling for chromium oxide abrasive material flow.Metal Substrate chromium oxide magnetic abrasive prepared by the present invention, chromium oxide and metallic matrix are firmly combined with, and there is high magnetic grinding performance, the control of production process program, properties of product to stablize, be suitable for large-scale production.
Description
Technical field
A kind of twin-jet nozzle that freely lands of present invention offer mixes powder aerosolization water cooling and coagulates Metal Substrate chromium oxide magnetic abrasive system soon
Preparation Method belongs to the preparing technical field of composite material.
Background technology
From materialogy angle, magnetic abrasive is a kind of composite material, i.e. iron-based enhanced type composite material, mainly by ferromagnetic phase
With abrasive grain phase composition.Ferromagnetic phase requires good magnetic conductivity and electric conductivity, and common used material is straight iron powder or fe-based alloy powder
End.Abrasive grain is mutually a kind of particulate matter with higher hardness, strength and stability for having grinding, grinding and polishing action concurrently,
Common used material has corundum, chromium oxide, silicon nitride, silicon carbide etc..The chemical composition and its proportioning and structure of magnetic abrasive are to determine
The key factor of magnetic abrasive performance this requires keeping closely combining between ferromagnetic phase and abrasive grain phase, and will have suitably
Granularity, it is also necessary to have a kind of suitable preparation method.
In the prior art there are many kinds of the preparation methods of magnetic abrasive, they can generally be divided into three classes：Mechanical mixture
Method, composite material method, reactive casting method.
Mechanical mixing is that ferromagnetic powder, abrasive powders and lapping liquid etc. is uniformly mixed at normal temperatures by a certain percentage
It closes, the method for being directly ground processing.The ferromagnetic powder and abrasive powders such as Al of common certain particle size2O3、SiC、Cr2O3、
TiC etc. after mixing, adds adhesive such as oleic acid, polyethylene glycol, silica gel etc. and is made.This kind of method can be made a variety of
Magnetic abrasive, preparation process is simple, at low cost, but during grinding, abrasive grain is easier to detach winged with Magnaglo
It dissipates, grinding efficiency is low, limits application range.
From the point of view of materialogy, magnetic abrasive is a kind of composite powder, i.e. iron-based grains enhanced type composite material
Powder.It is two or more material heterogeneous material made of certain combination process, and performance is specific
Aspect is substantially better than raw material.With the development of composite material, the technology of preparing of magnetic abrasive has also obtained corresponding development,
Preparation process mainly has sintering process, mull technique, composite deposite method etc. there are many kind.
Sintering process is that current magnetic abrasive prepares most common method.In Japan, this method has been applied successfully to work
In the production of industry metaplasia.According to the difference of specific sintering condition, it is divided into as normal pressure-sintered, hot pressed sintering, laser sintered, microwave sintering
Deng.Due to the processing performance and service life of magnetic abrasive, it is largely certainly taken at the bond strength of abrasive grain phase and ferromagnetic phase.
Magnetic abrasive prepared by sintering process, has substantial portion of abrasive material phase and ferromagnetic phase separation in mechanical crushing, screening process, causes
Ferromagnetic phase is combined strength reduction with abrasive grain, and durability declines.
Mull technique is divided into inorganic bond and organic adhesive according to the difference of selected binder, is by certain proportion, mixing
Uniform ferromagnetic powder and abrasive powders are bonded together with binder, are then cured, then mechanical crushing, screening, are made not
The magnetic abrasive powder of one-size.Magnetic abrasive prepared by mull technique need not contain lazy due to not needing advance briquet
The equipment such as electric furnace, the laser machine of property gas, therefore this method is simple for process, easy to implement, cost is relatively low.But tissue looseness, knot
It is poor to close, and density is low, and thermal stability is poor, and abrasive grain is mutually easy to fall off, and the service life is shorter.And when temperature is higher, cohesive magnetic abrasive
Make the surface of processing at furvous, original finished surface is easy contaminated damage.
Certain abrasive grain is equably mingled with metal by the method for composite deposite method composite plating or composite electroless-plating
In coating, and the special coating formed is composite deposite.Compound plating technology is applied in the technology of preparing of magnetic abrasive,
By development for many years, oneself is successfully applied in many sciemtifec and technical spheres composite deposite method, but production cost is higher, batch production
It is difficult to realize, plating solution is dealt with improperly can also cause environmental pollution.
Its principle of reactive casting method is under certain condition, to pass through the chemistry between element and element or element and compound
Reaction, the ceramic enhancement phase of fabricated in situ one or more high intensity in human body are obtaining the alloy containing ceramic enhancement phase
Afterwards, it reheats and melts and be blow molded into powder under high pressure.Reactive casting method presently, there are the problem of be that ceramics are hard in magnetic abrasive
The content of matter abrasive material is low and hard abrasive grain therein also is difficult to control.
Plasma spraying method is after being pre-mixed iron-based powder and hard abrasive grain uniformly by a certain percentage, to place
In the raw material powder feed room of plasma spraying equipment.In the vacuum chamber of plasma spray injection device, applied between two electrodes
Increase frequency discharge voltage, plasma jet flame is generated by plasma generator.The raw material powder mixed is continuous simultaneously
Ground is injected in plasma torch, and plasma torch temperature can reach 5000 ~ 10000 DEG C of high temperature, constantly by raw material powder
It is fused into microlayer model, then cools down, be frozen into Magnetic Spherical abrasive grain.Although this kind of method solves iron-based phase and abrasive material phase
The problem of poor compatibility, but magnetic abrasive prepared by this method is due to the high temperature action by plasma torch, abrasive grain phase it is sharp
Cutting edge is passivated, its grinding efficiency is caused to significantly reduce, the magnetic that grainding capacity is even prepared less than other straightforward procedures
Property abrasive material.
Currently, magnetic abrasive finishing skin processing is that the magnetic abrasive service life is low, cutting power to metal the problem of being primarily present
Difference, preparation are difficult and of high cost.The backwardness of magnetic abrasive Study on Preparation Technology has become and restricts magnetic abrasive finishing skin processing skill
Art further genralrlization application（As free form surface grinds skin processing）Bottleneck problem.For this purpose, the present inventor has invented " aerosolization
Solidifying magnetic abrasive preparation method soon "（ZL201010206408.6）, " equipment for preparing atomized quick-setting magnetic abrasive "
（ZL201110156753.8）, " pneumatic atomizing rapid condensation method prepares the structural form control method of magnetic abrasive "
（ZL201110156741.5）, and preferable effect is achieved in practice, but influence magnetic abrasive there is also some and prepare matter
The key technical problem of amount, such as：
（1）Jet nozzle problem：Due to being to use single nozzle, Dual-Phrase Distribution of Gas olid jet velocity is high, leads to jet nozzle
Quick erosive wear, and fail in extremely short time, the preparation function of magnetic abrasive is lost；Simultaneously or due to being using single
One nozzle, hard abrasive material and high pressure gas are together as atomizing medium, the atomizing effect if Dual-Phrase Distribution of Gas olid effluxvelocity is low
It is bad, abrasive magnetic particles are coarse, but if Dual-Phrase Distribution of Gas olid effluxvelocity is high, although although magnetic abrasive grain size reduces,
It can splash again after hard abrasive material enters molten metal, lead to the hard abrasive material contained in magnetic abrasive metallic matrix
It die-offs, magnetic abrasive machining performance significantly reduces.
（2）The erosive wear problem of molten metal diversion pipe：Using tightly coupled atomizing type, to molten metal liquid stream mist
Before change, Dual-Phrase Distribution of Gas olid is ejected into the lower end of molten metal diversion pipe first, causes in the molten metal diversion pipe lower end short time
Serious erosive wear is generated, and molten metal and high pressure gas is caused to return the danger sprayed along molten metal diversion pipe.
（3）The condensation rate control problem of liquid magnetic abrasive drop：Due to there is no to solve molten state magnetic abrasive drop
Condensation rate accurately control problem, depth distribution of its hard abrasive material of the magnetic abrasive of preparation in metallic matrix is unstable always
It is fixed, the grainding capacity of magnetic abrasive is directly affected, rejection rate is higher.
（4）The content control problem of hard abrasive material in magnetic abrasive：Strength send mixed powder device to accurately control gas due to being difficult to
The flow of hard abrasive material in fixed double phase flow, cause the content of hard abrasive material in magnetic abrasive is unstable, performance of magnetic abrasive not
Stablize.
（5）The erosive wear problem of molten metal diversion pipe：Using tightly coupled atomizing type, to molten metal liquid stream mist
Before change, Dual-Phrase Distribution of Gas olid is ejected into the lower end of molten metal diversion pipe first, causes in the molten metal diversion pipe lower end short time
Serious erosive wear is generated, and molten metal and high pressure gas is caused to return the danger sprayed along molten metal diversion pipe.
Invention content
It can overcome the magnetic abrasive knot that drawbacks described above, manufacturing process are simple, prepare the object of the present invention is to provide a kind of
Conjunction intensity and grinding efficiency is all more satisfactory, is advantageously implemented the magnetic abrasive preparation method of batch production.Its technical solution is：
A kind of twin-jet nozzle that freely lands mixes powder aerosolization water cooling and coagulates Metal Substrate chromium oxide magnetic abrasive preparation method soon, special
Sign is：It is four kinds of iron, silicon, aluminium, copper element compositions that the hard abrasive material of magnetic abrasive, which uses chromium oxide powder, metal_based material,
Alloy；Nozzle is freely landed nozzle using Dual-layer, and the upper layer nozzle that freely lands is that low pressure mixes powder jet nozzle, is sprayed
It is that the low-pressure inert gas containing chromium oxide abrasive material mixes powder jet stream, effect is to break through the surface tension of metal liquid stream in downflow processes
Chromium oxide abrasive material is injected in metal liquid stream, but molten metal stream is not atomized；Nozzle is freely landed as high pressure draught in lower layer
Nozzle, what is sprayed is high velocity inert air-flow, and effect is atomized to the molten metal stream for being mixed with chromium oxide abrasive material, its atomization is made
As being mixed with the molten drop of chromium oxide abrasive material；The type of cooling is water cooling：By adjusting cooling water in the water level for being atomized water cooling chamber
Highly, the flying distance to control containing chromium oxide abrasive material molten drop in being atomized water cooling chamber, and then control containing oxidation
The cooling velocity of chromium abrasive material molten drop, to form the magnetism that chromium oxide abrasive material is distributed in magnetic abrasive Metal Substrate body surface shallow-layer
Abrasive material；It send mixed powder to use spiral and send meal mixer, realize the essence that low-pressure inert gas mixes chromium oxide abrasive material flow in powder jet stream
Really and facilitate control so that the stable content of chromium oxide abrasive material in magnetic abrasive.
To realize that goal of the invention, the twin-jet nozzle that freely lands mix powder aerosolization water cooling and coagulate Metal Substrate chromium oxide magnetic abrasive system soon
The preparation of Preparation Method, Metal Substrate chromium oxide magnetic abrasive includes the following steps：
1）In chromium oxide abrasive can（26）The chromium oxide abrasive material of middle filling set amount simultaneously screws chromium oxide abrasive material cover（25）；
2）Electric furnace is added in metal_based material iron, silicon, aluminium, copper to scale, is heated to molten condition and reaches defined
The degree of superheat；
3）Open cold valves（6）And adjust atomization water cooling chamber（36）Middle cooling water（37）Water level reach defined height；
4）Open air blower（12）, suction atomization water cooling chamber（36）In gas；
5）Open connection high-pressure nitrogen bottle 1（13）With high pressure draught nozzle（34）Between air valve 1（16）And it adjusts to rule
Fixed stream pressure, and water cooling chamber will be atomized（36）In be full of nitrogen so that the metal aerosolization that will be carried out is completely disposed at nitrogen
In the atmosphere of gas；
6）Open connection high-pressure nitrogen bottle 2（14）Powder jet nozzle is mixed with low pressure（33）Between air valve 2（15）And it adjusts
To defined stream pressure；
7）Start helix transporting device（24）And control powder feed rate by technological requirement；
8）By electric furnace（30）In molten metal uniformly pour into heat preservation crucible（31）In, and regulation liquid level is kept, directly
To electric furnace（30）In molten metal to the greatest extent until；
9）In heat preservation crucible（31）After middle molten metal is all flow to end, helix transporting device is closed in order（24）, air valve 1
（16）, air valve 2（15）, air blower（12）；
10）Closing gate valve（5）So that atomization water cooling chamber（36）It is filled with magnetic abrasive（39）Between close, open discharging valve
（1）So that magnetic abrasive fills（39）In water outflow, open press filtration air valve（4）So that high pressure gas enters magnetic abrasive filling（39）
Inner cavity in, strainer（2）Magnetic abrasive is blocked in magnetic abrasive to fill（39）Epicoele in, and water therein is forced to squeeze out；
11）Magnetic abrasive is filled（39）It removes, takes out magnetic abrasive therein, by vacuum drying, screening and packaging, from
And obtain varigrained magnetic abrasive.
Compared with prior art, the present invention having the following advantages that：
1, as a result of the double-deck nozzle that freely lands of high-low pressure, freely land nozzle its effect of upper layer is flowed through under breaking through
The surface tension of metal liquid stream injects chromium oxide abrasive material in metal liquid stream in journey, but is not atomized to molten metal stream, upper layer
Nozzle its effect of freely landing is atomized to the molten metal stream for being mixed with chromium oxide abrasive material, so that its atomization is become and is mixed with chromium oxide
The injection mixing of metal liquid stream chromium oxide abrasive material is efficiently separated with atomization, is avoided single by the molten drop of abrasive material, this method
Chromium oxide abrasive material caused by nozzle atomization splashes, waste and abrasive magnetic particles size are uneven, chromium oxide abrasive content unevenness is asked
Topic, ensure that abrasive magnetic particles size, the uniformity and controllability of magnetic abrasive chromium oxide abrasive content.
2, due to upper layer freely land nozzle to molten metal stream be atomized thus injection chromium oxide abrasive material air-flow pressure
Power is low, efficiently solves the problems, such as the erosive wear to nozzle containing chromium oxide abrasive material.
3, as a result of the nozzle that freely lands, molten metal diversion pipe is located at the top of two nozzles, and two nozzles spray
Air-flow be all not directly placed on the lower end of metal diversion pipe, avoid the high speed that close coupled system nozzle contains hard abrasive material
Air-flow also avoids the molten metal caused by molten metal conductance pipe erosive wear to the serious erosive wear of metal diversion pipe
Problem is sprayed in reflux.
4, metallic copper is added in metal_based material, effectively increases metal_based material and chromium oxide abrasive material in magnetic abrasive
The bond strength of particle.
5, the type of cooling that water cooling is coagulated soon is used, solves in magnetic abrasive chromium oxide abrasive grain from metallic matrix
Dissociate and go out the problem with depth distributed controll, the table shallow-layer that chromium oxide abrasive material is distributed in magnetic abrasive can be controlled so that system
Standby magnetic abrasive magnetic permeability is high, grainding capacity is strong, while significantly reducing the distance of mixed flour gold category droplet flight, reduction
Freely land and be atomized the whole height of water cooling chamber and equipment, reduces cost.
6, it uses spiral and send meal mixer, solve and mixed powder device is sent to be difficult to accurately control hard abrasive material in Dual-Phrase Distribution of Gas olid
The problem of flow so that the stable content of hard abrasive material in magnetic abrasive.
7, the addition of silicon, aluminium, copper, increases metal_based material in water cooling is coagulated soon Cooling Mode and metal_based material
Bond strength between chromium oxide abrasive material.
8, the technical process of the invention for preparing magnetic abrasive can realize automation, stable and reliable for performance, be suitable for high-performance gold
Belong to the large-scale production of base chromium oxide magnetic abrasive.
Description of the drawings
Fig. 1 is that the twin-jet nozzle that freely lands that the present invention uses mixes powder aerosolization water cooling solidifying Metal Substrate chromium oxide magnetic abrasive soon
Preparation equipment schematic diagram, wherein：1- discharging valves, 2- strainers, 3- magnetic abrasives, 4- press filtration air valves, 5- gate valves, 6- cold valves, 7-
Water seal tank body, 8- water seal water, 9- inlet valves, 10- intake valves, 11- air inlet pipe, 12- drainpipes, 13- high-pressure nitrogen bottles 1,14-
High-pressure nitrogen bottle 2,15- air valves 2,16- air valves 1,17- spirals send meal mixer, 18- tracheaes 3,19- tracheaes 1,20- air gauges 1,
21- air gauges 2,22- tracheaes 2,23- tracheaes 4,24- helix transporting devices, 25- chromium oxide abrasive material covers, 26- chromium oxide abrasive materials
Tank, 27- hard abrasive materials, the mixed powder tracheaes of 28-, 29- molten metals, 30- electric furnaces, 31- heat preservation crucibles, 32- molten metal diversion pipes,
33- low pressure mixes powder jet nozzle, 34- high pressure draught nozzles, 35- water-level gauges, 36- atomizations water cooling chamber, 37- cooling waters, 38- atomizations
Water cooling room housing, 39- magnetic abrasive tanks, 40- cross drainage, 41- two-nozzle atomization water cooling plants, 42- suction dust collecting devices, 43-
Air blower, 44- gas station.
Specific implementation mode
Embodiment 1
The preparation of Metal Substrate chromium oxide magnetic abrasive includes the following steps：
1）In chromium oxide abrasive can（26）The chromium oxide abrasive material of middle filling set amount simultaneously screws chromium oxide abrasive material cover（25）；
2）Metal_based material presses iron:Silicon:Aluminium:Copper=83%:9%:6%:2% weight ratio is added electric furnace and is heated to molten condition
And reach the defined degree of superheat；
3）Open cold valves（6）And adjust atomization water cooling chamber（36）Middle cooling water（37）Water level reach defined height；
4）Open air blower（12）, suction atomization water cooling chamber（36）In gas；
5）Open connection high-pressure nitrogen bottle 1（13）With high pressure draught nozzle（34）Between air valve 1（16）And it adjusts to rule
Fixed stream pressure, and water cooling chamber will be atomized（36）In be full of nitrogen so that the metal aerosolization that will be carried out is completely disposed at nitrogen
In the atmosphere of gas；
6）Open connection high-pressure nitrogen bottle 2（14）Powder jet nozzle is mixed with low pressure（33）Between air valve 2（15）And it adjusts
To defined stream pressure；
7）Start helix transporting device（24）And control powder feed rate by technological requirement；
8）By electric furnace（30）In molten metal uniformly pour into heat preservation crucible（31）In, and regulation liquid level is kept, directly
To electric furnace（30）In molten metal to the greatest extent until；
9）In heat preservation crucible（31）After middle molten metal is all flow to end, helix transporting device is closed in order（24）, air valve 1
（16）, air valve 2（15）, air blower（12）；
10）Closing gate valve（5）So that atomization water cooling chamber（36）It is filled with magnetic abrasive（39）Between close, open discharging valve
（1）So that magnetic abrasive fills（39）In water outflow, open press filtration air valve（4）So that high pressure gas enters magnetic abrasive filling（39）
Inner cavity in, strainer（2）Magnetic abrasive is blocked in magnetic abrasive to fill（39）Epicoele in, and water therein is forced to squeeze out；
11）Magnetic abrasive is filled（39）It removes, takes out magnetic abrasive therein, by vacuum drying, screening and packaging, from
And obtain varigrained magnetic abrasive.
Claims (2)
1. the twin-jet nozzle that freely lands mixes powder aerosolization water cooling coagulates Metal Substrate chromium oxide magnetic abrasive preparation method soon, feature exists
In：It is the conjunction of iron, silicon, aluminium, four kinds of elements of copper composition that the hard abrasive material of magnetic abrasive, which uses chromium oxide powder, metal_based material,
Gold；Nozzle is freely landed nozzle using Dual-layer, and the upper layer nozzle that freely lands is that low pressure mixes powder jet nozzle, and what is sprayed is
Low-pressure inert gas containing chromium oxide abrasive material mixes powder jet stream, and effect is to break through the surface tension general of metal liquid stream in downflow processes
Chromium oxide abrasive material is injected in metal liquid stream, but is not atomized to molten metal stream；Nozzle is freely landed as high pressure draught spray in lower layer
Mouth, what is sprayed is high velocity inert air-flow, and effect is atomized to the molten metal stream for being mixed with chromium oxide abrasive material, it is made to be atomized into
To be mixed with the molten drop of chromium oxide abrasive material；The type of cooling is water cooling：It is high by adjusting water level of the cooling water in atomization water cooling chamber
Degree, the flying distance to control containing chromium oxide abrasive material molten drop in being atomized water cooling chamber, and then control and contain chromium oxide
The cooling velocity of abrasive material molten drop, to form the magnetic mill that chromium oxide abrasive material is distributed in magnetic abrasive Metal Substrate body surface shallow-layer
Material；Mixed powder is sent to send meal mixer using spiral.
2. the twin-jet nozzle according to claim 1 that freely lands mixes powder aerosolization water cooling and coagulates Metal Substrate chromium oxide magnetic abrasive soon
Preparation method, it is characterised in that the preparation process of Metal Substrate chromium oxide magnetic abrasive is as follows：
1) the chromium oxide abrasive material of set amount is loaded in chromium oxide abrasive can (26) and screws chromium oxide abrasive material cover (25)；
2) electric furnace is added in metal_based material iron, silicon, aluminium, copper to scale, is heated to molten condition and reaches defined overheat
Degree；
3) cold valves (6) are opened and adjust the water level of cooling water (37) in atomization water cooling chamber (36) and reach defined height；
4) gas in air blower (12), suction atomization water cooling chamber (36) is opened；
5) it opens the air valve 1 (16) between connection high-pressure nitrogen bottle 1 (13) and high pressure draught nozzle (34) and adjusts to defined
Stream pressure, and nitrogen will be full of in atomization water cooling chamber (36) so that the metal aerosolization that will be carried out is completely disposed at nitrogen
In atmosphere；
6) it opens connection high-pressure nitrogen bottle 2 (14) and low pressure is mixed the air valve 2 (15) between powder jet nozzle (33) and adjusted to rule
Fixed stream pressure；
7) start helix transporting device (24) and control powder feed rate by technological requirement；
8) molten metal in electric furnace (30) is uniformly poured into heat preservation crucible (31), and keeps regulation liquid level, Zhi Dao electricity
Until molten metal in stove (30) is use up；
9) after molten metal is all flow to end in heat preservation crucible (31), helix transporting device (24), air valve 1 are closed in order
(16), air valve 2 (15), air blower (12)；
10) so that being closed between atomization water cooling chamber (36) and magnetic abrasive tank (39), open discharging valve (1) makes closing gate valve (5)
The water outflow in magnetic abrasive tank (39) is obtained, opens press filtration air valve (4) so that high pressure gas enters the interior of magnetic abrasive tank (39)
In chamber, magnetic abrasive is blocked in the epicoele of magnetic abrasive tank (39) by strainer (2), and water therein is forced to squeeze out；
11) magnetic abrasive tank (39) is removed, takes out magnetic abrasive therein, by vacuum drying, screening and packaging, to obtain
To varigrained magnetic abrasive；
12) temperature of molten metal, the powder feeding speed of helix transporting device (24) in above process, are controlled according to technological requirement
Degree, low pressure mix the injection pressure of powder jet nozzle (33) and high pressure draught nozzle (34), cooling water (37) in atomization water cooling chamber
(36) water level in can generate good magnetic abrasive.
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