CN101041184A - Method for preparing metal sizing agent by a compelling, equal-freezing and continuous method - Google Patents
Method for preparing metal sizing agent by a compelling, equal-freezing and continuous method Download PDFInfo
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Abstract
The invention relates to a method for forced uniform solidified continuous preparing metal slurry, comprising that (1) melting overheat metal with the temperature more than the liquidus temperature about 0-100deg.C is poured into upper guide flow pipe; (2) the liquid metal flows into the melting deconcentrator and the liquid metal is injected on the inner round wall of melting deconcentrator; the temperature control system out of pulping room make the wall temperature of pulping room be controlled lower than the liquidus temperature about 0-100deg.C; the liquid metal is collected at the cone bottom to obtain the metal slurry with solid fraction smaller than 30%; the metal slurry flows out through the lower guide flow pipe and the temperature is controlled in -10-10deg.C of liquidus temperature; (3) the metal slurry flows into the collector or is sent into the common equipment such as die-casting, rolling and forging so on directly to carry rheological forming out and or is cast into the mould continuously to produce semi-solid continuous casting slab. The merit of invention is that the preparation of metal slurry is uniform, mass and continuous, and it can satisfy the demand of huge industrial production easily.
Description
Technical field
The present invention relates to the method that a kind of compelling, equal-freezing prepares metal paste continuously, belong to material forming and manufacture field.
Background technology
By compulsive means preparations contain tiny in a large number, evenly be suspended in the metal paste of nucleus in the liquid phase, this slurry has fine flowability, adopt such metal paste to carry out cast form, the foundry goods interior tissue is tiny, even, fine and close, defectives such as contraction, pore, segregation, crackle reduce significantly, can significantly improve the foundry goods mechanical performance; Adopt the strand of this metal paste preparation to carry out following process, can obviously reduce the generation of problems such as cracking, tissue odds are even, segregation, improve lumber recovery, processability and product mechanical property, what is more important, can just can meet the requirements of microstructure and property with less pressure processing amount.Therefore, metal paste preparation method's research has become one of important directions that improves the metal material performance.Seek out such metal paste, be to the process of setting achieve effective control.At first create the condition of a large amount of forming cores in liquid metal, and guarantee that nucleus evenly distributes, and controls the speed of growth of nucleus simultaneously in liquid phase.Usually a large amount of nucleus that utilize forced convection that Quench type wall place is formed constantly are involved in the liquid, and under the effect of convection current inner nucleus of metal liquid and uniformity of temperature profile, avoid low temperature place nucleus to grow up fast and the remelting of high temperature place nucleus.This slurry that contains the mass efficient nucleus is in follow-up solidifying, and crystal grain is difficult to grow up to very big crystal grain growing into to a certain degree just restriction each other, can obtain tiny, uniform microstructure.Therefore, how to realize that the metal liquid homogeneous nucleation is simple, continuous, the stable key for preparing the method for the alloy pulp that contains certain fraction solid of exploitation.
Based on above-mentioned understanding, abroad the representative patent that has proposed has: electromagnetic stirring method (US4434837), slope cooling method (US 6595266 B2), CRP method (US 6880613 B2).Electromagnetic stirring method has the advantage that noncontact is stirred, but shortcoming is equipment complexity, cost height, and particularly for large-sized foundry goods or ingot casting, because the electromagnetism kelvin effect, tissue odds is even to be unavoidable.The advantage of slope cooling method is that equipment is simple, but poor controllability, when fluid layer approaches, easy scull; When fluid layer is thick, forming core and non-uniform temperature, the preparation stability of slurry is poor.The CRP method can prepare slurry continuously, equipment is simple, the convection action of two streams is strong, can obtain stable metal paste, but because liquid metals flows mobile the belonging in the pipe in reactor, scattering and disappearing of heat relies on the heat exchange of liquid and tube wall fully, and this will cause heart portion liquid stream to there are differences with the temperature that flows near wall liquid, and temperature is difficult for evenly; Secondly this method is the material and the exchange heat of carrying out two liquid stream in reactor, and the caliber of two liquid stream can not be too big, therefore is unsuitable for handling the metal liquid stream of big flow, so production efficiency is low.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, propose the method that a kind of compelling, equal-freezing prepares metal paste continuously, solve continuously, stablize the problem of the even metal paste of preparation.Its core is that melt disperser by the rotation in the pulping chamber is with large volume or a large amount of metal liquids, the liquid that is divided into multithread small size or a small amount of is handled, and by control cooling and forced convertion, make its inside form numerous small nucleus simultaneously, and make Temperature Distribution, CONCENTRATION DISTRIBUTION, the nucleus of melt distribute even as far as possible.Such melt slurry is in follow-up solidifying, and crystal grain is difficult to grow up to very big crystal grain growing into to a certain degree just restriction each other, can obtain tiny, uniform microstructure.
For achieving the above object, the present invention takes following technical scheme, and the method that a kind of compelling, equal-freezing prepares metal paste continuously comprises 4 steps:
(1), over-heat metal that melting is qualified, to be higher than the temperature of 0～100 ℃ of its liquidus temperature, continuously pour into the last mozzle of pulp preparation device;
(2), metal liquid flow on the melt disperser through last mozzle, by extending into the melt disperser of the rotation in the pulping chamber, in the atmosphere of nitrogen or argon gas, the metal liquid spray is thrown on the inwall of the pulping chamber around the melt disperser;
(3) metal liquid after disperseing flows down and mixes along internal face, simultaneously, the outer temperature-controlling system of pulping chamber makes the wall temperature of pulping chamber be controlled under its liquidus temperature 0～100 ℃, metal liquid is cooled when dirty along the pulping chamber inwall, forming core, metal liquid converges in the pulping chamber conical lower portion, obtain fraction solid less than 30% metal paste, metal paste flow into down mozzle, and metal paste is controlled at-10～10 ℃ of its liquidus temperature in the temperature at draft tube outlets place down;
(4), metal paste flows in the gatherer of a Controllable Temperature through following mozzle, carries out rheological molding on the conventional equipments such as the be delivered directly to die casting of metal paste in the gatherer, rolling, die forging; Perhaps continuously be poured in the crystallizer, make the semisolid continuous casting base.
In the method for the invention, melt disperser by the rotation in the pulping chamber is with large volume or a large amount of metal liquids, the liquid that is dispersed into multithread small size or a small amount of is handled, forming core in the process that metal liquid flows down along the pulping chamber internal face, and mix, obtain uniformly, fraction solid is less than 30% metal paste.
In described step (2), the process that metal liquid is sprayed on the inwall that is thrown to melt disperser pulping chamber all around is to carry out in the atmosphere of nitrogen or argon gas, and wherein, nitrogen or argon gas are 1～1.5 atmospheric pressure.
Prepare continuously in the method for metal paste at compelling, equal-freezing of the present invention, the melt disperser can have two kinds of following forms: nozzle-type or shunting disc type.
In described step (2), the melt disperser that described melt disperser is a nozzle-type is the nozzle that adopts rotation, and metal liquid is sprayed from nozzle; The rotating speed of shower nozzle is 0～300 rev/min, and ≠ 0.
In described step (2), described melt disperser is the melt disperser of shunting disc type, the disc that is provided with rotating shaft by the center is formed, metal liquid is flowed along the disc upper surface, edge at disc tangentially throws away, it tilts described disc all around by axial rotary, angle 90～150 degree of disc and rotating shaft; 0～1400 rev/min of the rotating speed of shunting disk, and ≠ 0.
Prepare continuously in the method for metal paste at compelling, equal-freezing of the present invention, described step (2) is repeatedly carried out repeatedly, promptly adopt last mozzle, melt disperser, pulping chamber, the following mozzle of many groups, the metal paste that will flow out from the following mozzle of previous pulping chamber is sent to the Next mozzle of going up, through next melt disperser the metal liquid spray is thrown on the inwall of Next pulping chamber, metal liquid flows down and mixes along internal face, flow into again in the Next mozzle down, after reaching the number of times of repetition of regulation, carry out next procedure again.
Advantage of the present invention is:
(1), the inventive method adopts the rotation disperser continuously with large volume or a large amount of metal liquids, the liquid that is divided into multithread small size or a small amount of is handled, can effectively control process of setting, realize even, a large amount of, efficient, the serialization preparation of metal paste, big industrial requirement is content with very little.
(2), the melt after disperseing from disperser is thrown to the pulping chamber inwall along tangent line, fluid layer thickness is little, temperature is easy to control; When washing away the pulping chamber inwall, spiral path has strong convection current at metal liquid, a large amount of nucleus that the pulping chamber inwall forms constantly are involved in metal liquid, simultaneously when liquid stream converges to the pulping chamber bottom, convection current does not still stop, and can make nucleus, Temperature Distribution in the slurry more even.Therefore, the metal paste quality is realized stable, control effectively.
(3), common large scale foundry goods or ingot casting crystal grain is thick, structural heterogenity is inevitable.And after dispersion treatment, flow into metal paste in the gatherer of Controllable Temperature, because a large amount of nucleus evenly distribute in whole gatherer in the metal paste, in follow-up solidification forming process, can be under identical cooling velocity, obtain more tiny and uniform tissue, thereby be more suitable for preparing large scale foundry goods or ingot casting.
(4), simple, the applied range, practical of pulping equipment.Pulping chamber is simple in structure, mix, heat exchanger effectiveness height, production efficiency height.Continuously the metal paste of preparation not only can be delivered directly to conventional former, utilizes common process such as rolling, die casting, extruding, die forging to carry out rheological molding, also can be prepared into blank, is used for various pressure processing.This method both had been suitable for the preparation of aluminium alloy size, also was suitable for the preparation of non-ferrous metal slurries such as acid bronze alloy, magnesium base alloy, zinc-containing alloy.
Description of drawings
Fig. 1 is that the nozzle-type slurry prepares schematic diagram continuously.Among the figure: 1 shower nozzle, 2 shower nozzle rotating mechanisms, 3 carriages, 4 pulping chambers, 5 temperature control systems, mozzle on 6,7 nozzles, 8 times mozzles.
Fig. 2 is that shunting disc type slurry prepares schematic diagram continuously.Among the figure: 1 ' shunting disk, 2 ' shunting disk rotating mechanism, 3 carriages, 4 pulping chambers, 5 temperature control systems, mozzle on 6,7 ' disc, 8 times mozzles.
Concrete embodiment
Nozzle-type slurry continuous preparation device mainly contains shower nozzle 1, pulping chamber 4, temperature control system 5,2 four parts of shower nozzle rotating mechanism, and shown in Fig. 1 figure, shower nozzle 1, pulping chamber 4, temperature control system 5 is coaxial from inside to outside is installed on the carriage 3.Shower nozzle 1 is made of last mozzle 6 and the nozzle 7 that is installed in its bottom, and shower nozzle rotating mechanism 2 power connect to be gone up the top of mozzle 6, and to drive nozzle 7 rotations, nozzle 7 stretches into pulping chamber 4 inside.Temperature-controlling system 5 is to be made of cooler and heater.Pulping chamber 4 is a cylinder that has conical lower portion, lid with holes is equipped with on top, hole wherein can be kept supplying mozzle 6 and therefrom pass, air inlet pipe is housed on the lid, mozzle 8 is equipped with down in the bottom, following mozzle 8 docks with the middle pit of the stomach of the conical lower portion of pulping chamber 4, and metal bath is injected to through nozzle 7 on the inwall of pulping chamber 4 by last mozzle 6, and the slurry that forms through cooling is flowed out by following mozzle 8.
The over-heat metal that melting is qualified to be higher than the temperature of 0～100 ℃ of its liquidus temperature, continuously pours into mozzle 6.Liquid metals is ejected on the inwall of pulping chamber 4 through the nozzle 7 of last mozzle 6 bottoms; The rotating speed of last mozzle 6 is 0～300 rev/min, and ≠ 0, metal liquid flows down and mixes along internal face, converges in the conical lower portion of pulping chamber 4, obtains fraction solid less than 30% metal paste, and the following mozzle 8 through pulping chamber 4 bottoms flows in the gatherer.The outer temperature-controlling mechanisms 5 of pulping chamber 4 can make the wall temperature of pulping chamber 4 be controlled under the liquidus temperature 0～100 ℃.Molten metal is cooled when dirty along pulping chamber 4 inwalls, flows out down the temperature of mozzle 8 and is controlled near the liquidus curve-10～10 ℃.State treated slurry and can flow into gatherers, perhaps be delivered directly on the conventional equipments such as die casting, rolling, die forging and carry out rheological molding, perhaps continuously be poured in the crystallizer, make continuous casting billet through following mozzle 8.
As shown in Figure 2, shunting disc type slurry continuous preparation device mainly contains shunting disk 1 ', pulping chamber 4, temperature control system 5,2 ' four parts of shunting disk rotating mechanism, as shown in Figure 2, the structure of shunting disc type slurry continuous preparation device and nozzle-type slurry continuous preparation device is removed and is adopted shunting disk 1 ' and shower nozzle 1 respectively, outside the difference, all the other are all identical in this.Though different as for the transmission system title, its structure is all the same.Shunting disk 1 ' is made up of the disc 7 ' institute that the center is provided with rotating shaft, and it tilts disc 7 ' all around by axial rotary, and last mozzle 6 can be a plurality of, and the outlet of last mozzle 6 is towards disc 7 ', metal bath can be flowed into by a plurality of mozzles 6 of going up, and flows on the disc 7 '.Shunting disk rotating mechanism 2 ' power connects on the rotating shaft of shunting disk 1 ', to drive disc 7 ' rotation.Disc 7 ' is spent with the angle 90～150 of rotating shaft; 0～1400 rev/min of the rotating speed of shunting disk, and ≠ 0.Pulping chamber 4, temperature control system 5, shunting disk rotating mechanism 2 ' are all identical with pairing structure in the nozzle-type slurry continuous preparation device, have just no longer illustrated.
The over-heat metal that melting is qualified to be higher than the temperature of 0～100 ℃ of its liquidus temperature, continuously pours into mozzle 6.Liquid metals flows on the disc 7 ' that rotates with certain speed through last mozzle 6, disc 7 ' tangentially is thrown to liquid metals on the inwall of pulping chamber 4, the outer temperature-controlling mechanisms 5 of pulping chamber 4 can make the wall temperature of pulping chamber 4 be controlled under the liquidus temperature 0～100 ℃, molten metal is cooled when dirty along pulping chamber 4 inwalls, metal liquid is dirty along internal face, converge, mix in pulping chamber 4 conical lower portion, obtain fraction solid less than 30% metal paste, metal paste flows out down the temperature of mozzle 15 and is controlled near the liquidus curve-10～10 ℃.Metal paste flows in the gatherer through the following mozzle 8 of pulping chamber 4 bottoms.Perhaps be delivered directly on the conventional equipments such as die casting, rolling, die forging and carry out rheological molding; Perhaps continuously be poured in the crystallizer, make the semisolid continuous casting base.
Adopting nozzle-type slurry continuous preparation device to prepare cross dimensions is 3.5 o'clock semisolid circle base, material is the A357 alloy, liquidus temperature is 613 ℃, require casting billet surface roughness＜0.25, following process need not removed the peel processing, non-dendrite ratio is greater than 80% in the strand, and average crystal grain diameter is less than 100 μ m, as semi-solid die casting.In the production process, with medium-frequency induction furnace melting A357 alloy, after the degasification refining treatment, static 20 minutes, pouring temperature was controlled at 680 ℃.The technical parameter that the present invention adopts is: pulping chamber is closed down mozzle after being preheated to 600 ℃, sprays into protective gas (nitrogen or argon gas are greater than an atmospheric pressure) in pulping chamber.The qualified alloy of above-mentioned melting, the temperature with 680 ℃ continuously pours in the mozzle, and by the nozzle ejection of its lower end to the inwall of pulping chamber, the wall temperature of pulping chamber is controlled at 600 ℃, fluctuation range ± 2 ℃.Open down mozzle, the exit slurry temperature is 610～616 ℃, and slurry enters crystallizer and carries out semi-continuous casting, and the water mold intensity of cooling is 0.5 * 10
3Kcal/m
2S, casting speed is 300mm/min, does not have bleedout and tensile phenomenon to take place in the casting process, blank surface is smooth, tissue be improved significantly, non-dendrite is graininess mutually, non-dendrite ratio 95% in the strand, average crystal grain diameter is less than 40 μ m.Do not have columnar zone and gross segregation in the macrostructure, its tissue and performance satisfy the semi-solid processing requirement fully.
The die casting of adopting shunting disc type slurry continuous preparation device to prepare the critical component-air compressor machine connecting rod of commercial bogie, raw material are the ZL108 aluminium alloy, liquidus temperature is about 605 ℃.Because that aluminium alloy air compressor machine mechanical properties of connecting rod requires is high, service condition is special, pore, casting flaw such as loose, qualification rate less than 80% take place in foundry goods easily.The present invention adopts technical scheme to be: with medium-frequency induction furnace melting zl108 alloy, after the degasification refining treatment, static 20 minutes, pouring temperature was controlled at 660 ℃.The technical parameter that adopts is: pulping chamber is closed down mozzle after being preheated to 600 ℃, sprays into protective gas (nitrogen or argon gas are greater than an atmospheric pressure) in pulping chamber.The qualified alloy of above-mentioned melting, temperature with 660 ℃, continuously pour in the mozzle, flow on the disc of the shunting disk that is rotating, flow along the disc upper surface, edge at disc, break away from disc along tangent line, be thrown on the inner tube wall of pulping chamber, metal liquid is dirty along internal face, the wall temperature of pulping chamber is controlled at 600 ℃, fluctuation range ± 2 ℃.Open down mozzle, the exit slurry temperature is 595～607 ℃, and slurry quantitatively enters in the molten cup of die casting machine and carries out casting forming.Find that by foundry goods being carried out x-ray inspection pore, defective such as loose obviously reduce, qualification rate is up to more than 95%.
Claims (4)
1, a kind of compelling, equal-freezing prepares the method for metal paste continuously, it is characterized in that: this method comprises the steps:
(1), over-heat metal that melting is qualified, to be higher than the temperature of 0～100 ℃ of its liquidus temperature, continuously pour into the last mozzle of pulp preparation device;
(2), metal liquid flow on the melt disperser through last mozzle, by extending into the melt disperser of the rotation in the pulping chamber, in the atmosphere of nitrogen or argon gas, the metal liquid spray is thrown on the inwall of the pulping chamber around the melt disperser;
(3) metal liquid after disperseing flows down and mixes along internal face, simultaneously, the outer temperature-controlling system of pulping chamber makes the wall temperature of pulping chamber be controlled under its liquidus temperature 0～100 ℃, metal liquid is cooled when dirty along the pulping chamber inwall, forming core, metal liquid converges in the pulping chamber conical lower portion, obtain fraction solid less than 30% metal paste, metal paste flow into down mozzle, and metal paste is controlled at-10～10 ℃ of its liquidus temperature in the temperature at draft tube outlets place down;
(4), metal paste flows in the gatherer of a Controllable Temperature through following mozzle, carries out rheological molding on the conventional equipments such as the be delivered directly to die casting of metal paste in the gatherer, rolling, die forging; Perhaps continuously be poured in the crystallizer, make the semisolid continuous casting base.
2, compelling, equal-freezing according to claim 1 prepares the method for metal paste continuously, it is characterized in that: in described step (2), the melt disperser that described melt disperser is a nozzle-type, it is the nozzle that adopts rotation, metal liquid is sprayed from nozzle, the rotating speed of shower nozzle is 0～300 rev/min, and ≠ 0.
3, compelling, equal-freezing according to claim 1 prepares the method for metal paste continuously, it is characterized in that: in described step (2), described melt disperser is the melt disperser of shunting disc type, the disc that is provided with rotating shaft by the center is formed, metal liquid is flowed along the disc upper surface, edge at disc tangentially throws away, and it tilts described disc all around by axial rotary, angle 90～150 degree of disc and rotating shaft; 0～1400 rev/min of the rotating speed of shunting disk, and ≠ 0.
4, compelling, equal-freezing according to claim 1 prepares the method for metal paste continuously, it is characterized in that: described step (2) is repeatedly carried out repeatedly, promptly adopt the last mozzle of many groups, the melt disperser, pulping chamber, following mozzle, the metal paste that will flow out from the following mozzle of previous pulping chamber is sent to the Next mozzle of going up, through next melt disperser the metal liquid spray is thrown on the inwall of Next pulping chamber, metal liquid flows down and mixes along internal face, flow into again in the Next mozzle down, after reaching the number of times of repetition of regulation, carry out next procedure again.
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| CN101147968B (en) * | 2007-10-22 | 2010-05-19 | 南昌大学 | Low-temperature shearing rheological die casting technology |
| CN102161081A (en) * | 2011-04-01 | 2011-08-24 | 天津福来明思铝业有限公司 | Continuous casting method for producing aluminium alloy semisolid casting ingot |
| CN104232954A (en) * | 2014-09-19 | 2014-12-24 | 湖南文昌科技有限公司 | Device and method for preparing composite material by adopting semi-solid stirring |
| CN106825483A (en) * | 2017-03-21 | 2017-06-13 | 昆明理工大学 | A kind of method and device for preparing semi solid slurry |
| CN106903595A (en) * | 2015-12-01 | 2017-06-30 | 株式会社迪思科 | Lapping device |
| CN109759555A (en) * | 2019-01-28 | 2019-05-17 | 深圳市银宝山新压铸科技有限公司 | A kind of method that Composite Field prepares semi solid slurry |
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| CN111663058A (en) * | 2020-06-28 | 2020-09-15 | 沈阳航空航天大学 | Fe-Al alloy used as aluminum alloy additive and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101147968B (en) * | 2007-10-22 | 2010-05-19 | 南昌大学 | Low-temperature shearing rheological die casting technology |
| CN102161081A (en) * | 2011-04-01 | 2011-08-24 | 天津福来明思铝业有限公司 | Continuous casting method for producing aluminium alloy semisolid casting ingot |
| CN104232954A (en) * | 2014-09-19 | 2014-12-24 | 湖南文昌科技有限公司 | Device and method for preparing composite material by adopting semi-solid stirring |
| CN106903595A (en) * | 2015-12-01 | 2017-06-30 | 株式会社迪思科 | Lapping device |
| CN106903595B (en) * | 2015-12-01 | 2020-08-07 | 株式会社迪思科 | Grinding device |
| CN106825483A (en) * | 2017-03-21 | 2017-06-13 | 昆明理工大学 | A kind of method and device for preparing semi solid slurry |
| CN109759555A (en) * | 2019-01-28 | 2019-05-17 | 深圳市银宝山新压铸科技有限公司 | A kind of method that Composite Field prepares semi solid slurry |
| CN111362239A (en) * | 2020-03-20 | 2020-07-03 | 辽宁瑞鸥新材料科技有限公司 | Cs for semi-solid pulping of aluminum-silicon alloy2HPO4Aerosol and method of use thereof |
| CN111663058A (en) * | 2020-06-28 | 2020-09-15 | 沈阳航空航天大学 | Fe-Al alloy used as aluminum alloy additive and preparation method and application thereof |
| CN112775420A (en) * | 2020-12-28 | 2021-05-11 | 湖南文昌新材科技股份有限公司 | Rotating device for preparing composite material and preparation method of aluminum-based composite material |
| CN112775420B (en) * | 2020-12-28 | 2022-06-21 | 湖南文昌新材科技股份有限公司 | Rotating device for preparing composite material and preparation method of aluminum-based composite material |
| CN113618074A (en) * | 2021-08-16 | 2021-11-09 | 辽宁科技大学 | Device and method for preparing iron alloy particles |
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Effective date of registration: 20190627 Address after: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee after: Research Institute of engineering and Technology Co., Ltd. Address before: 100088, 2, Xinjie street, Beijing Patentee before: General Research Institute for Nonferrous Metals |
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Effective date of registration: 20210720 Address after: 101407 No.11, Xingke East Street, Yanqi Economic and Technological Development Zone, Huairou District, Beijing Patentee after: Youyan metal composite technology Co.,Ltd. Address before: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee before: YOUYAN ENGINEERING TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |
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