CN104399767A - Method for extruding fine grain magnesium alloy sheet material - Google Patents
Method for extruding fine grain magnesium alloy sheet material Download PDFInfo
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- CN104399767A CN104399767A CN201410608045.7A CN201410608045A CN104399767A CN 104399767 A CN104399767 A CN 104399767A CN 201410608045 A CN201410608045 A CN 201410608045A CN 104399767 A CN104399767 A CN 104399767A
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Abstract
The invention discloses a method for extruding a fine grain magnesium alloy sheet material, which comprises the following steps: taking at least two types of same magnesium alloy blocks, and then overlapping and fixing, then adding the overlapped and fixed magnesium alloy block in an extruding cylinder for combined extrusion, the magnesium alloy block is extruded from an extrusion die orifice to obtain the magnesium alloy composite extruded sheet material. According to the extruding method, the same kind of magnesium alloy can be overlapped together for synchronous extrusion and treatment, due to existence of interface, mutual flowing generated by each magnesium alloy block during an extruding process can be avoided, crystal grain can be effectively refined, and thereby mechanical property of the final extruding product can be increased. According to the invention, only an extruding composite mode should by changed on the extruding method of the extruding method of the magnesium alloy sheet material, redesign of the extrusion die is not required, and the method has strong production and research values.
Description
Technical field
The invention belongs to metal and alloy field, relate to metal forming process, particularly the compound extrusion forming method of magnesium alloy plate of the same race.
Background technology
Magnesium alloy has specific strength, specific stiffness is high, thermal conductivity and damping vibration attenuation performance good, the advantages such as capability of electromagnetic shielding and machinability are excellent, are with a wide range of applications in each fields such as space flight and aviation, automobile, electrical equipment, communications.Because the crystal structure of magnesium alloy is close-packed hexagonal, lack independently slip system, therefore process more difficult.Up to the present, most of magnesium-alloy material is mainly through Foundry Production, but cast article exists organizes the shortcomings such as thick, defect is more, thus cause its mechanical property not ideal enough, greatly constrain the extensive use of magnesium alloy, and deformation processing magnesium alloy there is higher mechanical property than cast magnesium alloy.The more magnesium alloy deformation processing mode of current application is mainly roll forming and extrusion molding, but rolling mill practice more complicated, the production cycle is long, production efficiency is low, and product recovery rate is low, and ultimate cost is very high, and the large area having a strong impact on magnesium alloy plate uses.Compared with rolling, during extrusion process, material deforms under three-dimensional stress state, can be once extruded, and production efficiency is high; Meanwhile, the flexibility of extrusion process is large, can produce the product of shape of cross section complexity.Therefore, the mechanical property studying magnesium alloy extrusion sheet material has important meaning.
At present, magnesium alloy plate crimp mainly adopts single ingot casting directly to put into mould to carry out symmetrical forward extrusion, although extrusion process is simple, easy to operate, but the sheet material mechanical property obtained is limited, and there is comparatively serious basal plane texture, can not meet the need of market.
The purposes of magnesium-aluminium composite material (particularly composite board, bar) is very extensive, but commonsense method is difficult to produce satisfactory magnesium-aluminium composite material.For this reason, University Of Chongqing's gold-tinted victory and prosperous wait people the to individually disclose a kind of method (details application reference number 200610054269.3 " a kind of magnalium composite bimetal pipe/bars ", application number 201410152407.6 " a kind of magnalium multilayer composite board and processing method thereof ") that hollow aluminium ingot parcel magnesium ingot synchronously extrudes production magnesium-aluminium composite material of letter fortune.Although magnesium and aluminium are all synchronously added extruder and extrude by these two kinds of methods, but its object mainly forms aluminium alloy protective layer in magnesium alloy appearance, thus improve its resistance to corrosion, and magnesium alloy is completely coated by aluminium alloy in these two kinds of methods, in extrusion process, the lateral flow of magnesium alloy extrusion sheet material is subject to aluminum material coated restriction, very easily produce cross direction profiles uneven, finally cause whole composite horizontal organization and performance uneven, anisotropy is serious, is not well positioned to meet instructions for use; In addition, in this method extrusion process, magnesium alloy entirety does not contact with recipient, and it is in stress symmetric state (deformation process of magnesium alloy and the symmetrical extrusion type of ordinary magnesium alloy seemingly, can not improve the basal plane texture of magnesium alloy) along thickness direction.
Summary of the invention
In view of this, the object of the present invention is to provide the pressing method of fine grain magnesium alloy plate.
For achieving the above object, the invention provides following technical scheme:
The pressing method of fine grain magnesium alloy plate, first few two pieces of magnesium alloy blocks of the same race are taken to and superimposed fixing, then superimposed fixing magnesium alloy block is added recipient and carry out Compound Extrusion, described magnesium alloy block is extruded from extruding die orifice simultaneously, obtains described fine grain magnesium alloy plate.
Preferably, described magnesium alloy is AZ31 or AZ61.
Preferably, magnesium alloy block number of getting is 2-4 block, and the thickness of each piece is identical or different.
Preferably, superimposed fixing before also comprise and carry out cleaning smooth step to selected each piece of magnesium alloy contact surface, superimposed fixing after extruded before also comprise the step of heating and thermal insulation.
Preferably, the step that composite board is annealed also is comprised after extruded.
Beneficial effect of the present invention is: the present invention's magnesium alloy Compound Extrusion of the same race becomes method, magnesium alloy of the same race is stacked together and carries out synchronous extrusion process, due to the existence at interface, avoid in extrusion process and between each magnesium alloy block, produce flowing mutually and material mixing, the alloy of interface is only along the flowing of the direction of extrusion, in addition recipient is to the frictional force of magnesium alloy block opposite side, the flowing velocity of interface alloy along the direction of extrusion is made to there is notable difference with the speed near barrel place, extrusion billet through-thickness is made to there is larger shear strain, thus effective crystal grain thinning, improve the mechanical property of final extruded product.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is that embodiment 1 cast metals stacks schematic diagram;
Fig. 2 is that embodiment 3 cast metals stacks schematic diagram;
Fig. 3 is the metallograph that embodiment 1 extrudes gained sheet metal;
Fig. 4 is the metallograph that comparative example 1 extrudes gained sheet metal.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Embodiment 1:
The pressing method of the present embodiment fine grain magnesium alloy plate, comprises the following steps:
1) get one piece of cylindrical AZ31 magnesium alloy ingot and cut open along axis;
2) to polish step 1) cutting plane of gained semi-cylindrical magnesium alloy cleaning-drying;
3) by step 2) two pieces of semi-cylindrical magnesium alloy ingots after polishing are stacked together that (cutting plane is relative, as shown in Figure 1) and fix (avoid in extrusion process, producing macroscopical relative sliding, should fit tightly between two pieces of magnesium alloy ingots, seamless) with aluminium wire;
4) by step 3) stack fixing after magnesium alloy block be heated to 400 DEG C of insulation 1h after add recipient and extrude; Described magnesium alloy block of the same race is extruded from extruding die orifice simultaneously, forms magnesium alloy Compound Extrusion sheet material;
5) 400 DEG C of temper steps 4) sheet material extruded obtains product.
In the present embodiment, extrusion speed is 4m/min, and extrusion ratio is 40.
Embodiment 2:
The difference of the present embodiment and embodiment 1 is, in the present embodiment, the thickness of two pieces of magnesium alloy ingots is not identical, and wherein the thickness of magnesium alloy ingot of one piece is 1/2 of another block.
Embodiment 3:
The pressing method of the present embodiment fine grain magnesium alloy plate, comprises the following steps:
1) the AZ31 casting of magnesium alloy ingot bar that three pieces of cross sections can overlap completely is got;
2) cleaning polishing step 1) casting of magnesium alloy ingot bar;
3) by step 2) polishing after ingot casting block be stacked together (as shown in Figure 2) and fix with aluminium wire;
4) by step 3) the fixing alloy block that stacks be heated to 380 DEG C of insulation 1h and be placed on pressurizing unit and extrude; Described magnesium alloy block of the same race is extruded from extruding die orifice simultaneously, forms magnesium alloy Compound Extrusion sheet material of the same race;
5) 400 DEG C of temper steps 4) sheet material extruded obtains product.
In the present embodiment, the Thickness Ratio of three blocks of AZ61 ingot castings is 1:1:1.
In the present embodiment, extrusion speed is 4m/min, and extrusion ratio is 40.
Comparative example 1:
Carry out common symmetric extruding in 400 DEG C after getting the polishing of cylindrical AZ31 magnesium alloy ingot, extrusion speed is 4m/min, and extrusion ratio is 40.
Performance test:
Example 1 and comparative example 1 gained sheet material carry out metallographic structure analysis and Mechanics Performance Testing, result as Fig. 3,4 and following table shown in:
Fig. 3 is the metallograph of embodiment 1 gained sheet material, can find out, does not have obvious compound interface in the composite board of AZ31 and AZ31, and this illustrates that two boards material is by combining closely after Compound Extrusion, does not exist the problem easily peeled off.
Fig. 4 is the metallograph of comparative example 1 gained magnesium alloy plate; Can find out, compared with comparative example, the crystal grain of embodiment 1 gained sheet material is more evenly tiny, and this illustrates that magnesium alloy of the same race is combined with each other the method for extruding by embodiment 1 can obvious crystal grain thinning, and then the mechanical property of raising sheet material.
| Classification | Tensile strength/MPa | Yield strength/MPa | Percentage elongation/% |
| Comparative example 1 | 248.5 | 163.3 | 17.1 |
| Embodiment 1 | 273.0 | 149.1 | 22.0 |
As can be seen from the above table, compared with the AZ31 sheet material of the common extruding of comparative example 1, the intensity of embodiment 1 gained Compound Extrusion sheet material and to be mouldingly all largely increased.
The method that the present embodiment coextrusion mold produces metallic composite panel only need change extrusion cladding mode, without the need to redesigning extrusion die, has stronger production and researching value.
It should be noted that, in the present invention, " magnesium alloy of the same race " both can refer to the magnesium alloy (trade mark is identical) that chemical composition is identical, and can be also the magnesium alloy that chemical composition is similar, this it will be apparent to those skilled in the art that." magnesium alloy " of the present invention is not limited to AZ31, can also be the wrought magnesium alloy of AZ61 or other kinds.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (5)
1. the pressing method of fine grain magnesium alloy plate, it is characterized in that: be first taken to few two pieces of magnesium alloy blocks of the same race and superimposed fixing, then superimposed fixing magnesium alloy block is added recipient and carry out Compound Extrusion, described magnesium alloy block is extruded from extruding die orifice simultaneously, obtains described fine grain magnesium alloy plate.
2. the pressing method of fine grain magnesium alloy plate according to claim 1, is characterized in that: described magnesium alloy is AZ31 or AZ61.
3. the pressing method of fine grain magnesium alloy plate according to claim 1, it is characterized in that: magnesium alloy block number of getting is 2-4 block, the thickness of each piece is identical or different.
4. the pressing method of fine grain magnesium alloy plate according to claim 1, is characterized in that: superimposed fixing before also comprise and carry out cleaning smooth step to selected each piece of magnesium alloy contact surface, superimposed fixing after extruded before also comprise the step of heating and thermal insulation.
5. the pressing method of fine grain magnesium alloy plate according to claim 1, is characterized in that: also comprise the step of annealing to composite board after extruded.
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| CN201410608045.7A CN104399767A (en) | 2014-10-30 | 2014-10-30 | Method for extruding fine grain magnesium alloy sheet material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104309265A (en) * | 2014-10-30 | 2015-01-28 | 重庆大学 | Extrusion method of metal composite board |
| CN107081342A (en) * | 2017-05-16 | 2017-08-22 | 西安工程大学 | A kind of sheet material extruding method of low temperature difficult-to-deformation material |
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| JPS6160215A (en) * | 1984-08-31 | 1986-03-27 | Daido Metal Kogyo Kk | Manufacture of multilayer slide material |
| JPS62179809A (en) * | 1986-01-31 | 1987-08-07 | Showa Alum Corp | Production of hollow extruded profile made of aluminum for vacuum |
| JP2004034127A (en) * | 2002-07-05 | 2004-02-05 | Toyo Kohan Co Ltd | Metal sheet joint body manufacturing method, method for manufacturing laminate body using the metal sheet joint body, and method for manufacturing component using the laminate body |
| CN101049616A (en) * | 2007-05-09 | 2007-10-10 | 中国科学院金属研究所 | Method for preparing lamellar composite material of heterogeneic alloy |
| CN101486048A (en) * | 2009-02-19 | 2009-07-22 | 河南科技大学 | Composite shaping method of metal-based layer-shaped composite board and press forming mold thereof |
| CN103394537A (en) * | 2013-07-17 | 2013-11-20 | 华南理工大学 | Preparation method of fine-grain/ultra-fine-grain metal stratified material |
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2014
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6160215A (en) * | 1984-08-31 | 1986-03-27 | Daido Metal Kogyo Kk | Manufacture of multilayer slide material |
| JPS62179809A (en) * | 1986-01-31 | 1987-08-07 | Showa Alum Corp | Production of hollow extruded profile made of aluminum for vacuum |
| JP2004034127A (en) * | 2002-07-05 | 2004-02-05 | Toyo Kohan Co Ltd | Metal sheet joint body manufacturing method, method for manufacturing laminate body using the metal sheet joint body, and method for manufacturing component using the laminate body |
| CN101049616A (en) * | 2007-05-09 | 2007-10-10 | 中国科学院金属研究所 | Method for preparing lamellar composite material of heterogeneic alloy |
| CN101486048A (en) * | 2009-02-19 | 2009-07-22 | 河南科技大学 | Composite shaping method of metal-based layer-shaped composite board and press forming mold thereof |
| CN103394537A (en) * | 2013-07-17 | 2013-11-20 | 华南理工大学 | Preparation method of fine-grain/ultra-fine-grain metal stratified material |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104309265A (en) * | 2014-10-30 | 2015-01-28 | 重庆大学 | Extrusion method of metal composite board |
| CN107081342A (en) * | 2017-05-16 | 2017-08-22 | 西安工程大学 | A kind of sheet material extruding method of low temperature difficult-to-deformation material |
| CN107081342B (en) * | 2017-05-16 | 2018-10-02 | 西安工程大学 | A kind of plank extruding method of low temperature difficult-to-deformation material |
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Application publication date: 20150311 |