CN104264089B - A kind of electro-magnetic forming and the compound aluminium alloy semi-solid state blank technique of preparing of secondary remelting - Google Patents
A kind of electro-magnetic forming and the compound aluminium alloy semi-solid state blank technique of preparing of secondary remelting Download PDFInfo
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- CN104264089B CN104264089B CN201410475801.3A CN201410475801A CN104264089B CN 104264089 B CN104264089 B CN 104264089B CN 201410475801 A CN201410475801 A CN 201410475801A CN 104264089 B CN104264089 B CN 104264089B
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Abstract
A kind of electro-magnetic forming and the compound aluminium alloy semi-solid state blank technique of preparing of secondary remelting, select aluminium alloy bar, utilize electromagnetic forming device to carry out plastic deformation to this aluminium alloy bar, and make it produce plastic strain, be advanced to and in intermediate frequency induction heating device, carry out secondary remelting processing producing the metal bar material of plastic strain subsequently, thereby prepare the aluminium alloy semi-solid state blank with the nearly spherical microstructure of tiny even non-dendrite, it is simple that the present invention has technological process, cost is low, the feature such as the high and forming property of efficiency is superior.
Description
Technical field
The invention belongs to metal semi-solid blank preparing technical field, relate in particular to a kind of electro-magnetic forming and twoThe compound aluminium alloy semi-solid state blank technique of preparing of inferior remelting.
Background technology
Semi-solid processing is that professor Flemings of 20 century 70 Massachusetts Institute Technologies proposesA kind of metal forming method. So-called semi-solid processing is exactly to solidus and liquidus curve by METAL HEATING PROCESSBetween temperature, insulation certain hour, to obtain spherical or subglobose crystal grain, and then it is enteredThe technology that row is shaped, spherical or subglobose semi solid slurry, has good fluidity, plastic forceLow and be shaped after the advantages such as part performance is good, therefore this technique is subject to increasing attention.
In semi-solid-state shaping process, how to obtain and there is non-dendrite tiny evenly nearly spherical microstructureSemi solid slurry is a very the key link, and this link has directly determined the one-tenth of follow-up semi-solid-state shapingWhether merit to be, up to the present, although people have developed many new works of preparing metal semi-solid slurrySkill and new technology, as electromagnetic stirring method, mechanical mixing method, ultrasonic vibration method, strain induced melt activationMethod (SIMA), heat treating process, semi-solid isothermal change method, spray deposition etc., but successful business shouldWith spherical or granular primary crystal semi-solid metal slurry and continuous casting material production technology only have electromagnetic agitation andStrain-induced melt activation (SIMA).
Electromagnetic agitation ratio juris is: utilize rotary electromagnetic field in motlten metal, to produce induction field,Motlten metal produces violent motion under the effect of Loulun magnetism, to obtain desirable semi solid slurry.The outstanding advantages of the method is contactless paddling process, has effectively overcome and has been similar to churned mechanically bladeOr the problem of stirring rod corrosion contamination, there is in addition the advantages such as flexible, the easy adjusting of mixing parametric control.At present, in non-ferrous metal making semisolid slurry, electromagnetic stirring method is most widely used, and appliesIn industrial production, but also deposit shortcoming: 1. ferrous metal fusing point is high, melt conductance is low, thereby givesThe preparation of semi solid slurry brings very large difficulty, and power of agitator is large as required, mixing time is long; 2.Due to Kelvin effect, the Loulun magnetism in semi solid slurry progressively strengthens from center to periphery, therefore diameterThe blank that is greater than 150mm should not adopt electromagnetic stirring method, and blank is organized on cross section also inhomogeneous;3. electromagnetic stirring method is prepared in semi solid slurry process, produce alternating magnetic field, therefore power consumption large,Cost is high, and in the time that motlten metal surrounding forms solidified shell, mixing effect is not good.
The principle of strain-induced melt activation (SIMA) is: first to cast out conventional ingot casting, thenIt is carried out to plastic deformation and make the strain that material production is certain, be then heated to solid-liquid two-phase region to obtain halfSolid metallic slurry (being organized as spherical), then carry out semisolid moulding. This method has been removed liquid metal fromTreatment process, high and low fusing point alloy all can be applied, and technique is simple, easily realizes automation. Especially shouldMethod can be carried out blanking by the volume size of parts, makes the volume of blank just in time can meet the volume of final productsRequirement, can save raw material so greatly, accomplishes to produce (newly net forming) without waste material or less waste material,Thereby significantly reduce the processing cost of product. The key technology of strain-induced melt activation (SIMA)Be that the conventional ingot casting to casting out how carries out plastic deformation, conventional method is that ingot casting is carried out at presentThe plastic deformation processing such as jumping-up, extruding or rolling, but all there is the problem that deflection is little, deformation efficiency is low,Therefore, the technology of preparing of spherical or granular primary crystal semi-solid metal slurry or continuous casting material still restricts at presentThe application of Semi-solid Metals Forming Techniques.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of electro-magnetic forming withThe compound aluminium alloy semi-solid state blank technique of preparing of secondary remelting, simplifies the process flow of preparing semi-solid blankJourney, reduces costs, and improves forming quality.
In order to achieve the above object, the present invention takes following technical scheme:
A kind of electro-magnetic forming and the compound aluminium alloy semi-solid state blank technique of preparing of secondary remelting, comprise following stepRapid:
1) select materials: select aluminium alloy bar 1;
2) electro-magnetic forming: utilize electromagnetic forming device 2 that aluminium alloy bar 1 is carried out moulding distortion and madeIt produces plastic strain, is specially:
2.1) open electromagnetic forming device 2 and gradually level advance aluminium alloy bar 1 to fill to electro-magnetic formingPut 2 inner mobile, so, be connected with the electricity outside electro-magnetic forming collection chinaware 2-1 that is configured in of By Impulsive CurrentMagnetic forming solenoid 2-2 will produce strong pulsed magnetic field, and under the effect of electro-magnetic forming collection chinaware 2-1,The aluminium alloy bar 1 that approaches electro-magnetic forming collection chinaware 2-1 is produced to plastic deformation, and form initial deformationState aluminium alloy bar 1-1;
2.2), under the effect of electromagnetic forming device 2, continuation level advances aluminium alloy to belong to bar 1, formsIntermediate deformation state aluminium alloy bar 1-2;
2.3) in step 2.2) basis on, continuation level advances aluminium alloy to belong to bar 1, forms finalDeformation state aluminium alloy bar 1-3, closes electromagnetic forming device 2 immediately;
3) secondary remelting: by above-mentioned steps 2) the middle final deformation state aluminium alloy bar 1-3 preparing,Continue to be advanced to the position of aluminium alloy semi-solid state blank 1-4, then, open intermediate frequency induction heating device 4,So, be connected with the hollow red copper solenoid 4-2 outside the heat-resisting crucible 4-1 of being configured in of electric current of intermediate frequency and cooling waterTo produce strong alternating magnetic field and penetrate heat-resisting crucible 4-1 and act on final deformation state aluminium alloy bar1-3 is upper, it is carried out to secondary remelting processing, and wherein temperature when secondary remelting is at aluminium alloy semi-solidIn interval range, choose, temperature retention time is chosen 5～30min, obtains having tiny after secondary remelting completesThe aluminium alloy semi-solid state blank 1-4 of even non-dendrite microstructure.
Between described electromagnetic forming device 2 and intermediate frequency induction heating device 4, be provided with magnetism-isolating loop 3.
With respect to prior art, the present invention has the following advantages:
(1) the present invention first completes the plastic deformation to aluminium alloy bar 1 by electromagnetic forming device 2, thenThe aluminium alloy bar 1 that produces plastic deformation is advanced to intermediate frequency induction heating device 4 and carries out secondary remelting,Thereby complete the semi-solid blank preparation with tiny even non-dendrite microstructure, simplified preparation half solidThe technological process of state blank, has reduced cost, has improved forming quality.
(2) the present invention completes the plastic deformation to aluminium alloy bar 1 by electromagnetic forming device 2, hasThe feature that texturing quality is good, deformation efficiency is high.
(3) semi-solid blank of preparing by the present invention, thus can directly obtain by cooler is coolingThe semi-solid blank that can conveniently transport, also can be directly used in semi-solid rheological molding.
Brief description of the drawings
Fig. 1 is the structural representation of equipment therefor of the present invention.
Fig. 2 is the schematic three dimensional views of equipment therefor of the present invention.
Fig. 3 is while aluminium alloy bar 1 being carried out to plastic deformation by electromagnetic forming device 2 in the present inventionOriginal state schematic diagram.
Fig. 4 is the intermediateness while aluminium alloy bar 1 being carried out to plastic deformation by electromagnetic forming device 2Schematic diagram.
Fig. 5 is the end-state while aluminium alloy bar 1 being carried out to plastic deformation by electromagnetic forming device 2Schematic diagram.
Fig. 6 is the signal while aluminium alloy bar 1 being carried out to secondary remelting by intermediate frequency induction heating device 4Figure.
Fig. 7 is the micro-organization chart of the aluminium alloy semi-solid state blank prepared of embodiment.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is elaborated.
The aluminum alloy materials that the present embodiment is selected is A356.2, and secondary remelting temperature is 580 DEG C, when insulationBetween be 10min.
The compound technique of preparing aluminium alloy semi-solid state blank of electro-magnetic forming and secondary remelting, comprises followingStep:
1) select materials: select aluminium alloy bar 1, the material of aluminium alloy bar 1 is A356.2 herein;
2) electro-magnetic forming: with reference to Fig. 1 and Fig. 2, utilize electromagnetic forming device 2 to aluminium alloy bar 1Carry out moulding distortion and make it produce plastic strain, be specially:
2.1), with reference to Fig. 3, unlatching electromagnetic forming device 2 gradually level advance aluminium alloy bar 1 to electricityMagnetic forming device 2 is inner mobile, so what be connected with By Impulsive Current is configured in electro-magnetic forming collection chinawareThe enough solenoid 2-2 of electro-magnetic forming outside 2-1 will produce strong pulsed magnetic field, and at electro-magnetic forming collection chinaware 2-1Effect under, the aluminium alloy bar 1 that approaches electro-magnetic forming collection chinaware 2-1 is produced to plastic deformation, and shapeBecome initial deformation state aluminium alloy bar 1-1;
2.2), with reference to Fig. 4, under the effect of electromagnetic forming device 2, continuation level advances aluminium alloy to belong to rodMaterial 1, forms intermediate deformation state aluminium alloy bar 1-2;
2.3) with reference to Fig. 5, in step 2.2) basis on, continuation level advance aluminium alloy belong to bar 1,Form final deformation state aluminium alloy bar 1-3, close immediately electromagnetic forming device 2;
3) secondary remelting: with reference to Fig. 6, by above-mentioned steps 2) the middle final deformation state aluminium alloy of preparingBar 1-3, continues to be advanced to the position shown in aluminium alloy semi-solid state blank 1-4, then, opens intermediate frequencyInduction heating apparatus 4 is provided with every magnetic between electromagnetic forming device 2 and intermediate frequency induction heating device 4Ring 3, prevents from, in the time opening electromagnetic forming device 2 or intermediate frequency induction heating device 4, between them, producingInfluence each other, so, be connected with the hollow purple outside the heat-resisting crucible 4-1 of being configured in of electric current of intermediate frequency and cooling waterCopper solenoid 4-2 will produce strong alternating magnetic field and penetrate heat-resisting crucible 4-1 and act on final distortion shapeState aluminium alloy bar 1-3 is upper, it is carried out to secondary remelting processing, and wherein secondary remelting temperature is580 DEG C, temperature retention time is 10min, can obtain having tiny even non-dendrite after secondary remelting completesThe aluminium alloy semi-solid state blank 1-4 of microstructure, concrete micro-organization chart is with reference to Fig. 7.
Claims (2)
1. the compound aluminium alloy semi-solid state blank technique of preparing of electro-magnetic forming and secondary remelting, its featureBe, comprise the steps:
1) select materials: select aluminium alloy bar (1);
2) electro-magnetic forming: utilize electromagnetic forming device (2) to carry out plasticity change to aluminium alloy bar (1)Shape also makes it produce plastic strain, is specially:
2.1) open electromagnetic forming device (2) and gradually level advance aluminium alloy bar (1) to electromagnetismBuilding mortion (2) is inner mobile, so what be connected with By Impulsive Current is configured in electro-magnetic forming collection chinaware(2-1) outer electro-magnetic forming solenoid (2-2) will produce strong pulsed magnetic field, and at electro-magnetic forming collection magneticUnder the effect of device (2-1), the aluminium alloy bar (1) that approaches electro-magnetic forming collection chinaware (2-1) is producedPlastic deformation, and form initial deformation state aluminium alloy bar (1-1);
2.2), under the effect of electromagnetic forming device (2), continuation level advances aluminium alloy bar (1),Form intermediate deformation state aluminium alloy bar (1-2);
2.3) in step 2.2) basis on, continuation level advances aluminium alloy bar (1), forms finalDeformation state aluminium alloy bar (1-3), closes electromagnetic forming device (2) immediately;
3) secondary remelting: by above-mentioned steps 2) the middle final deformation state aluminium alloy bar (1-3) of preparing,Continue to be advanced to the position of aluminium alloy semi-solid state blank (1-4), then, open Frequency Induction Heating dressPut (4), so, be connected with outer hollow of the heat-resisting crucible of being configured in of electric current of intermediate frequency and cooling water (4-1)Red copper solenoid (4-2) will produce strong alternating magnetic field and penetrate heat-resisting crucible (4-1) and act onWhole deformation state aluminium alloy bar (1-3) is upper, it is carried out to secondary remelting processing, wherein secondary weightTemperature when molten is chosen in aluminium alloy semi-solid interval range, and temperature retention time is chosen 5～30min, secondaryAfter completing, remelting obtains having the aluminium alloy semi-solid state blank of tiny even non-dendrite microstructure(1-4)。
2. the compound aluminium alloy half of preparing of a kind of electro-magnetic forming according to claim 1 and secondary remeltingSolid-state blank technique, is characterized in that: described electromagnetic forming device (2) and Frequency Induction Heating dressPut and between (4), be provided with magnetism-isolating loop (3).
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| CN104668911B (en) * | 2015-02-06 | 2017-04-19 | 西安交通大学 | Radial forging type strain-induced semi-solid extrusion process for outer cylinder forged piece of aircraft landing gear |
| CN104723031B (en) * | 2015-02-06 | 2017-01-18 | 西安交通大学 | Radial-forging type strain induction semi-solid state extrusion technology for waveguide tube |
| CN108256133B (en) * | 2016-12-29 | 2021-07-09 | 格朗吉斯铝业（上海）有限公司 | Dynamic rolling simulation method of aluminum alloy composite ingot and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560161A (en) * | 2012-03-05 | 2012-07-11 | 昆明理工大学 | Method for preparing semi-solid slurry by strain induced melt activation (SIMA) method |
| CN103233190A (en) * | 2013-05-02 | 2013-08-07 | 昆明理工大学 | Method for preparing semisolid blank |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102560161A (en) * | 2012-03-05 | 2012-07-11 | 昆明理工大学 | Method for preparing semi-solid slurry by strain induced melt activation (SIMA) method |
| CN103233190A (en) * | 2013-05-02 | 2013-08-07 | 昆明理工大学 | Method for preparing semisolid blank |
Non-Patent Citations (2)
| Title |
|---|
| An Overview of Semisolid Processing of Aluminium Alloys;M.S.Salleh et al;《ISRN Materials Science》;Hindawi Publishing Corporation;20131231;第2013卷;1-9 * |
| 电磁成形技术在铝合金成形中的应用前景;陈文峰等;《塑性加工技术》;20030331(第3期);全文 * |
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