CN1142044C - A method for manufacturing alloy round blanks for semi-solid processing - Google Patents
A method for manufacturing alloy round blanks for semi-solid processing Download PDFInfo
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- CN1142044C CN1142044C CNB001249797A CN00124979A CN1142044C CN 1142044 C CN1142044 C CN 1142044C CN B001249797 A CNB001249797 A CN B001249797A CN 00124979 A CN00124979 A CN 00124979A CN 1142044 C CN1142044 C CN 1142044C
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- 238000013019 agitation Methods 0.000 abstract description 8
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- 229910001037 White iron Inorganic materials 0.000 description 2
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Abstract
The present invention relates to a method for manufacturing alloy round billet for semisolid processing. Firstly, qualified smelting alloy fusant is poured into a semisolid slurry preparation chamber which is preheated. The alloy fusant is cooled continuously in the process of passing the slurry preparation chamber. An agitation force making the fusant rotate horizontally and a vibration force making the fusant repeatedly shear along the vertical direction are applied to the fusant. The fusant enters a cooler under the action of a static pressure and the vibration force in the vertical direction and is cooled and solidified rapidly into the alloy round billet prepared by the present invention. The method of the present invention has the advantages of high preparation speed, high continuous casting speed, and no breaking out and stretch breaking in the process of continuous casting. The obtained alloy round billet satisfies the requirements for semisolid processing.
Description
Technical field
The present invention relates to a kind of manufacture method of circular alloy blank used for semi-solid processing, belong to the technical field of utilizing level stirring and vertical vibration to prepare semi solid slurry simultaneously and realizing the circular alloy blank used for semi-solid processing continuous casting.
Background technology
Circular alloy blank is a kind of half-wrought timber, can be used for further being rolled, various plastic workings such as extruding, drawing.In the prior art, the method for producing circular alloy blank mainly contains three kinds of die casting, semi-continuous casting and continuous castings.Wherein, alloy for die casting circle base length is shorter, and the dead head proportion reaches 20%-30%, and product yield is not high.Semi-continuous casting method is taked batch formula continuous producing method of multithread fixed length, it is the cast dish that liquid alloy at first pours into a plurality of cast gates, multithread enters the cooler solidification forming of its below simultaneously then, is moved downward with certain speed drive dummy ingot and blank by drawing billet mechanism.When blank is pulled to certain-length (being generally 4-6 rice), stop cast.Blank takes off blank after all pulling out cooler, prepares next throwing circulation.Continuous casing can be worked continuously, and obtains the blank of random length.These methods can be produced the circular alloy blank of various diameters, but all have a columnar zone and the equiax crystal district, center that crystallite dimension is bigger in the tissue of gained blank, and gross segregation is also relatively more serious.Further shaping in the process, it is even to occur crackle and tissue odds easily.
In order to improve the tissue of blank, the technology that electromagnetic agitation is improved the circular alloy blank tissue has appearred carrying out in crystallizer.But owing to the shielding action of crystallizer to magnetic field, mixing effect is bad, and the tissue of gained blank remains dendrite, and just crystallite dimension reduces to some extent.These technology can't prepare the used for semi-solid processing blank with non-dendritic structure.
After the semi-solid processing of material occurred, the demand with used for semi-solid processing blank of non-dendritic structure increased.A lot of methods that prepare circular alloy blank used for semi-solid processing have appearred.Wherein utilize stirring means to prepare the existing abroad a plurality of patents of technology of used for semi-solid processing blank, their common features are to apply electromagnetic agitation or mechanical agitation in continuous cooling of melt or insulating process, prepare the semi solid slurry that contains non-dendrite solid phase, adopt the method for the method of die casting or continuous casting to be cast as the blank of certain size then.The major defect of these technology has two.The one, because these stirrings are unidirectional stirring, dendrite is slow to non-dendrite transforming process, and it is longer that preparation contains semi solid slurry time of non-dendrite solid phase, thereby limited casting speed.Present accessible actual casting speed has only about 500mm/min.The 2nd, make semi solid slurry that the effect of the power of shear repeatedly take place owing to lack, the thixotropy of semi solid slurry is not in full use, and viscosity is bigger, and casting process accident occurs breaking owing to semi solid slurry can not in time replenish easily in crystallizer.
Summary of the invention
The method for continuous production that the purpose of this invention is to provide a kind of circular alloy blank used for semi-solid processing, adopt the vibration of the electromagnetic agitation and the vertical direction of horizontal direction simultaneously, improve the preparation speed of semi solid slurry, the viscosity of reduction semi solid slurry, prevent to break accident effectively and take place.
The manufacture method of the circular alloy blank used for semi-solid processing that the present invention proposes comprises following each step:
(1) alloy melt that melting is qualified continuously pours into semi solid slurry preparation room (abbreviation pulping chamber) through preheating with the temperature that is higher than liquidus temperature 0-10 ℃.The preheating of said pulping chamber can be various heating means of the prior art, and after preheat temperature must guarantee that alloy melt enters pulping chamber, the initial temperature of melt was higher than the solidus temperature of alloy near the pulping chamber inwall, was lower than the liquidus temperature of alloy.Such cast temperature and preheat temperature can guarantee to have on the pulping chamber inwall a large amount of fine crystals to form, and can not form complete solidified shell again simultaneously.The fine crystals that forms on the pulping chamber inwall can be fully free under the synergy of stirring and vibrating, and enters melt inside, promotes the quick formation of non-dendrite solid phase.If form complete solidified shell, above-mentioned crystal detachment too amplitude weakens, and the formation time of non-dendritic structure obviously prolongs.
(2) make its continuous cooling in the process by pulping chamber from top to bottom at alloy melt, apply a mixing power that makes melt level rotation and one simultaneously and make the vertically vibration force of shear repeatedly of melt, make alloy melt when arriving the pulping chamber outlet, become the semi solid slurry that contains the subsphaeroidal solid phase of the non-dendrite of 40-70%.Said cooling velocity needs control, is meant by adjusting the intensity of cooling of pulping chamber, and the temperature when making melt arrive the pulping chamber outlet is higher than the alloy solidus temperature, and inner contained solid phase ratio is between 40-70%.Said level stirs, and its power stirs rotary speed between 600-3000rpm between 15-100KW.The vibration of said vertical direction, its frequency are 60-500Hz, and amplitude is 2-20mm.This level stirs the synergy with vertical vibration, the easier quilt of small crystal that forms on the pulping chamber inwall is peeled off enter melt inside, serves as crystallization nuclei, promotes the quick formation of non-dendrite solid phase.In addition,, the apparent viscosity of semi solid slurry is reduced, can flow into cooler smoothly, accident do not occur breaking because the mechanical oscillation of vertical direction apply the shearforce that one-period changes to semi solid slurry.
(3) semi solid slurry of the subsphaeroidal solid phase of the above-mentioned said 40-70% of containing continuously enters under the effect of static pressure and vertical vibration power in the cooler with cylindrical cavity, and is become circular alloy blank by cooled and solidified fast.Said cooler, its intensity of cooling are different and different according to alloy species, but the temperature of heart portion is lower than solidus temperature 0-10 ℃ of alloy must guarantee that circular alloy blank leaves cooler the time.
The manufacture method of the circular alloy blank used for semi-solid processing that the present invention proposes, its advantage is:
(1) the semi solid slurry preparation speeds up, and casting speed improves
Owing to adopted the synergy of stirring with vibration, the easier quilt of small crystal that forms on the pulping chamber inwall is peeled off enter melt inside, serve as crystallization nuclei, promote the quick formation of non-dendrite solid phase.The formation time of non-dendritic structure can shorten to 15 seconds, reduces more than one times than prior art.Because the formation time of non-dendritic structure obviously shortens, casting speed can be brought up to 500-1500mm/min, and is higher more than 50% than prior art.
(2) thixotropy of semi solid slurry is given full play to, and casting process bleedout do not occur and breaks
In addition, because the vibration of vertical direction applies the shearforce that one-period changes to semi solid slurry, the semi solid slurry thixotropy can be given full play to, apparent viscosity reduces.Even solid phase ratio wherein reaches 70% and still can flow smoothly and do not occur breaking.
(3) circular alloy blank that obtains satisfies the semi-solid processing needs.
The gained circular alloy blank meets the semi-solid processing requirement, does not have columnar zone and significantly gross segregation.The shape of non-dendrite phase also contains a spot of petal-shaped degeneration dendrite based on subglobose graininess and short strip shape in its metallographic structure.Their size is less than 80 μ m, based on 30-60 μ m.The room temperature tensile strength of this blank can reach more than the 220MPa, and percentage elongation can reach more than 16%.Under semi-solid temperature can microstructure coarsening not take place owing to prolonging heat time heating time, opposite in less than 1 hour scope, prolong temperature retention time and can improve its forming property.
(4) the gained blank can carry out semi-solid processing, also can carry out solid-state processing
This blank has excellent semi-solid rheological performance, can carry out various semi-solid processing, as semisolid die casting, semisolid extruding, semi-solid rolling, semisolid forging and semisolid spinning etc.In addition, this blank also has good solid molding performance, can be used for carrying out various solid-state Plastic Forming.Compare with common continuous casting circular alloy blank, deformation drag obviously reduces, and the crackle tendency of following process process significantly reduces, and is the high-quality blank of traditional Plastic Forming.
The specific embodiment
Embodiment 1
With oil-fired air-furnace melting A356 aluminium alloy.In molten alloy, pulping chamber is preheating to 580 ℃, and insulation 30min.After melt quality is qualified, continuously pour into pulping chamber with 618-620 ℃ temperature.When in pulping chamber, carrying out electromagnetic agitation, carry out mechanical oscillation with the speed of 1650rpm.Vibration frequency 200Hz, amplitude 5mm.Alloy liquid is 25 seconds by the time of pulping chamber, and the temperature the when semi solid slurry that obtains leaves pulping chamber is 590 ℃, and wherein contained non-dendrite solid phase ratio is 65%.Enter intensity of cooling 0.5 * 10
3Kcal/m
2.s solidification forming in the water mold.And continuously blank is pulled out with the speed of 800mm/min, prepared diameter 75mm aluminium alloy semi-solid processing circular alloy blank.Heart portion temperature during blank leaving water cooling crystallizer is 530 ℃.Casting process does not have bleedout and tensile phenomenon to take place, and non-dendrite is graininess mutually in the blank tissue, and its volume fraction is 65%, average diameter 40 μ m; There are not tangible columnar zone and gross segregation in the macrostructure.Its tissue and performance satisfy the semi-solid processing requirement.
Embodiment 2
With medium-frequency induction furnace melting Fe-Cr-C is alloy white iron.In molten alloy, pulping chamber is preheating to 1150 ℃, and insulation 20min.After alloy melting is qualified, continuously pour into pulping chamber with 1350 ℃ temperature.When in pulping chamber, carrying out electromagnetic agitation, carry out mechanical oscillation with the speed of 700rpm.Vibration frequency 100Hz, amplitude 9mm.Alloy liquid is 35 seconds by the time of pulping chamber.Utilize cooling water and resistive heating device to adjust the intensity of cooling of pulping chamber, the temperature the when semi solid slurry that obtains leaves pulping chamber is 1250 ℃, and wherein contained non-dendrite solid phase ratio is 55%.Cooler is a water mold, its intensity of cooling 1.5 * 10
3Kcal/m
2.s.Casting speed 600mm/min, the used for semi-solid processing alloy white iron that has prepared diameter 80mm is justified base.Casting process is not broken or the bleedout phenomenon takes place, and non-dendrite is graininess mutually in the blank tissue, and its volume fraction is 55%, average diameter 50 μ m; There are not tangible columnar zone and gross segregation in the macrostructure.Its tissue and performance satisfy the semi-solid processing requirement.
Embodiment 3
With medium-frequency induction furnace melting Fe-Mn-C series high-manganese steel alloy.In molten alloy, pulping chamber is preheating to 1250 ℃, and insulation 20min.After alloy melting is qualified, pour into pulping chamber with 1340 ℃ temperature.Utilize the magnetic stirrer of 35Kw, when it being carried out electromagnetic agitation, carry out mechanical oscillation with the speed of 2500rpm.Vibration frequency 450Hz, amplitude 18mm.The method of adjustment of pulping chamber and cooler intensity of cooling is with embodiment 2.Temperature when semi solid slurry leaves pulping chamber is 1320 ℃, and wherein contained non-dendrite solid phase ratio is 40%.Cooler is a water mold, its intensity of cooling 3.5 * 10
3Kcal/m
2.s, casting speed reaches 1200mm/min, and casting process is not broken or the bleedout phenomenon takes place.Alloy liquid is 17 seconds by the time of pulping chamber, has obtained the used for semi-solid processing potassium steel circle base of diameter 80mm.Non-dendrite is graininess mutually in the blank tissue, and its volume fraction is 40%, average diameter 60 μ m; There are not tangible columnar zone and gross segregation in the macrostructure.Its tissue and performance satisfy the semi-solid processing requirement.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001249797A CN1142044C (en) | 2000-09-29 | 2000-09-29 | A method for manufacturing alloy round blanks for semi-solid processing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001249797A CN1142044C (en) | 2000-09-29 | 2000-09-29 | A method for manufacturing alloy round blanks for semi-solid processing |
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| CN1293088A CN1293088A (en) | 2001-05-02 |
| CN1142044C true CN1142044C (en) | 2004-03-17 |
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| CNB001249797A Expired - Fee Related CN1142044C (en) | 2000-09-29 | 2000-09-29 | A method for manufacturing alloy round blanks for semi-solid processing |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1411932B (en) * | 2002-03-01 | 2012-07-11 | 北京科技大学 | Spherical primary crystal semi-solid metal or alloy slurry direct molding method and device |
| CN100451141C (en) * | 2007-05-31 | 2009-01-14 | 东北大学 | Wave type inclined plate vibration device for preparing semisolid state alloy and preparation method thereof |
| CN101875105B (en) * | 2009-11-21 | 2012-01-25 | 华中科技大学 | Preparation method and device of semi-solid slurry |
| CN102806329A (en) * | 2012-07-17 | 2012-12-05 | 南昌大学 | Continuous blank casting system capable of performing semi-solid processing on non-ferrous alloy |
| CN104862579A (en) * | 2014-02-26 | 2015-08-26 | 铜陵有色金神耐磨材料有限责任公司 | Grinding ball and manufacturing method thereof |
| CN108655357A (en) * | 2017-03-28 | 2018-10-16 | 宝山钢铁股份有限公司 | A kind of metal melting continuous casing |
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2000
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