CN104492847B - Extruding method for texture-weakened magnesium alloy sheet - Google Patents
Extruding method for texture-weakened magnesium alloy sheet Download PDFInfo
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- CN104492847B CN104492847B CN201410608274.9A CN201410608274A CN104492847B CN 104492847 B CN104492847 B CN 104492847B CN 201410608274 A CN201410608274 A CN 201410608274A CN 104492847 B CN104492847 B CN 104492847B
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- alloy
- magnesium alloy
- magnesium
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- texture
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
Abstract
A disclosed extruding method for a texture-weakened magnesium alloy sheet comprises: 1) getting at least two heterogenous magnesium alloy blocks or magnesium alloy and aluminium alloy, superposing and fixing; 2) putting the superposed magnesium alloy block or the magnesium-alloy aluminium-alloy block obtained in the step 1) into an extrusion cylinder for extruding, and enabling the alloy block to be synchronously extruded from the extrusion die orifice, so as to obtain a magnesium-magnesium or magnesium-aluminium composite sheet; and 3) removing the aluminium layer or the relatively-thin magnesium layer on the composite sheet, so as to obtain the texture-weakened magnesium alloy sheet, wherein the magnesium alloy is preferably AZ31, AZ61 and AZ80 wrought magnesium alloy, and aluminium alloy is preferably 5052 and 6063. Thickness-direction metal mixing does not happen in the magnesium alloy sheet or the magnesium-alloy aluminium-alloy sheet during extrusion, also the two sides of the sheet when being extruded possesses a relatively large flow velocity difference, thus shear stress is introduced into the same magnesium alloy block, and the effects of refining crystal grain and weakening texture are given play. By employing the method of firstly performing combination and extrusion and then peeling off the relatively-thin magnesium layer, the crystal grain is obviously refined, and the texture is weakened.
Description
Technical field
The invention belongs to field of magnesium alloy, it is related to magnesium alloy molded method, particularly to by compound extrusion forming method
Produce high intensity, the method for low texture magnesium alloy plate.
Background technology
It is high that magnesium alloy has specific strength, a specific stiffness, and heat conductivity and damping vibration attenuation performance are good, capability of electromagnetic shielding and machining
The advantages of excellent performance, it is with a wide range of applications in each field such as space flight and aviation, automobile, electrical equipment, communication.Due to magnesium alloy
Crystal structure be close-packed hexagonal, lack independent slip system, therefore process relatively difficult.Up to the present, most of magnesium close
Golden product mainly passes through Foundry Production, but cast article has the shortcomings of tissue is thick, defect is more, thus leading to its mechanical property
Can be not ideal enough, greatly constrain the extensive application of magnesium alloy, and deformation processing magnesium alloy is higher than cast magnesium alloy has
Mechanical property.The more magnesium alloy deformation processing mode of application is mainly roll forming and extrusion molding at present, but rolling mill practice
Complexity, long the production cycle, efficiency are low, and the large area having a strong impact on magnesium alloy plate uses.Compared with rolling, material during extrusion process
Material deforms under three-dimensional stress state, can an extrusion molding, production efficiency is high；Meanwhile, the motility of extrusion process is big,
The complicated product of shape of cross section can be produced.Therefore, the mechanical property of research magnesium alloy extrusion sheet material has important meaning.
At present, magnesium alloy plate crimp is mainly directly placed into mould using single ingot casting and carries out symmetrical forward extrusion,
Although extrusion process is simple, easy to operate, the sheet material mechanical property obtaining is limited, and there is more serious basal plane texture,
The market demand can not be met.
The purposes of magnesium-aluminium composite material (particularly composite board, bar) is quite varied, but commonsense method is difficult to produce
Satisfactory magnesium-aluminium composite material.For this reason, University Of Chongqing gold-tinted victory and letter fortune is prosperous et al. individually discloses one kind hollow aluminum
Ingot wraps up magnesium ingot and synchronously extrudes method (the details application reference number 200610054269.3 producing magnesium-aluminium composite material《A kind of magnesium
Al bimetal multiple tube/bar》, application number 201410152407.6《A kind of magnalium multilayer composite board and its processing method》).
Although magnesium and aluminum are all synchronously added extruder to be extruded by both approaches, its purpose is mainly in magnesium alloy appearance shape
Becoming aluminium alloy protective layer, thus improving its resistance to corrosion, and in both approaches, magnesium alloy is coated by aluminium alloy completely, squeezing
During pressure, the horizontal mobility of magnesium alloy extrusion sheet material is limited by aluminum material coated, easily produces cross direction profiles uneven, finally
Cause whole composite horizontal organization and performance uneven, anisotropy is seriously it is impossible to meet use requirement well；Separately
Outward, in this method extrusion process, magnesium alloy is not contacted with recipient, and it is in stress symmetric state along thickness direction, and (magnesium closes
Deformation process and the ordinary magnesium alloy of gold symmetrically extrude similar it is impossible to improve the basal plane texture of magnesium alloy).
Content of the invention
In view of this, it is an object of the invention to provide a kind of produced high intensity, low knitted by compound extrusion forming method
The method of structure magnesium alloy plate.
For reaching above-mentioned purpose, the present invention provides following technical scheme：
The pressing method of texture attenuation magnesium alloy plate, comprises the following steps：
1), take at least two blocks xenogenesis magnesium alloys or magnesium alloy and Al alloy block and overlap fixation；
2), by step 1) the light-alloy block that is superimposed together adds extrusion die to be extruded, and described light-alloy block is from squeezing
Pressing mold mouth is synchronously extruded, and obtains composite board；
3), remove thinner thickness part in composite board, obtain texture attenuation magnesium alloy plate.Preferably, step 1) institute
There is notable difference in the forming property stated between magnesium alloy or magnesium alloy and aluminium alloy
Preferably, step 1) selected by light-alloy be one piece of AZ61 and one piece of AZ31, wherein the thickness of AZ61 is AZ31 block
Thickness 1/10～1/3.
Preferably, step 1) selected by magnesium alloy be one piece of AZ80 and one piece of AZ31, wherein AZ80 block thickness is AZ31 block
Thickness 1/15～1/3.
Preferably, step 1) selected by light-alloy include one block of AZ31 and one block of Al alloy, the thickness of wherein Al alloy block is
The thickness 1/10～1/3 of AZ31 block.
Preferably, in extrusion process, same magnesium alloy block extrudes stream with away from existing at contact interface at contact interface
Speed difference, in extrusion process, between the magnesium alloy block of each magnesium alloy block contact interface both sides, no macroscopic view is slided.
Preferably, also include each alloy block contact surface is carried out smooth step before overlapping alloy block, overlap alloy
The step that alloy block is heated also is included before extrusion molding after block.
Preferably, relatively thin magnesium layer or the aluminium lamination of composite board is removed using sander grinding.
The beneficial effects of the present invention is：
Two blocks of magnesium alloys or magnesium alloy are synchronized extruding together with aluminium alloy compound and are combined by the present invention first
Sheet material, then removes the magnesium alloy extrusion sheet material required for thinner layer obtains outside composite board；Magnesium alloy block in extrusion process
Between Presence of an interface, hinder thickness between extrusion billet to relative flow, so that blank is transversely extended with longitudinal Uniform Flow；
The magnesium alloy flowing velocity of interface essentially identical (in extrusion process, each blank interface has no macroscopic view slip) during extruding, and remote
Away from contact interface, the deformation performance due to different-alloy block is different, AZ61, AZ80 or 5052,6063 deformation performance relatively
AZ31 is poor, and during extruding, material flow rate is slower, and the extruding flowing velocity of AZ31 is very fast, and their extruding flowing velocity is deposited
In larger difference, thus there is the gradient strain along thickness in AZ31 magnesium alloy block, there is larger shear stress, not only acting as
The effect of crystal grain thinning, also can make crystal grain vert, thus weakening the basal plane texture of AZ31 sheet material.Gone using general sander grinding
After relatively thin magnesium alloy or aluminium alloy layer, not only can obtain single AZ31 sheet material it is also ensured that its preferable flatness.This
The magnesium alloy crystal grain of invention Compound Extrusion and then stripping outside thinner layer is substantially refined, and basal plane texture is obviously reduced.
Brief description
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below to carry out
Explanation：
Fig. 1 is that embodiment 1 magnesium alloy ingot overlaps schematic diagram；
Fig. 2 is that embodiment 3 magnesium alloy ingot overlaps schematic diagram；
Fig. 3 is the metallograph that embodiment 1 extrudes gained magnesium alloy plate；
Fig. 4 is the basal plane texture that embodiment 1 extrudes gained magnesium alloy plate；
Fig. 5 is the metallograph that embodiment 3 extrudes gained magnesium alloy plate；
Fig. 6 is the basal plane texture that embodiment 3 extrudes gained magnesium alloy plate；
Fig. 7 is the metallograph that comparative example 1 extrudes gained magnesium alloy plate.
Fig. 8 is the basal plane texture that comparative example 1 extrudes gained magnesium alloy plate.
Specific embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Embodiment 1：
The method that the present embodiment coextrusion mold produces magnesium alloy composite board material, comprises the following steps：
1) (AZ61 thickness is about AZ31's to take two pieces of semi-cylindrical AZ31 magnesium alloy ingots and AZ61 magnesium alloy ingot respectively
1/4)；
2) cleaning step 1) split surface of gained semi-cylindrical AZ31 magnesium alloy ingot and AZ61 magnesium alloy ingot polishing
Extremely smooth；
3) by step 2) polishing after semi-cylindrical AZ31 magnesium alloy ingot and AZ61 magnesium alloy ingot be superimposed together and (cut open
Tangent plane relatively, as shown in Figure 1) and fixed with aluminium wire (avoid producing macroface in extrusion process to slip, simultaneously should between sheet material
Seamless when fitting tightly)；
4) 400 DEG C of pressing steps 3) complex obtain composite board；
5) using machine cuts or polishing method remove composite board AZ61 magnesium alloy layer obtain to be prepared
AZ31 magnesium alloy plate.
The present embodiment utilizes AZ61 to produce AZ31 magnesium alloy plate with AZ31 co-extrusion, and AZ61 both can play assistant formation
Effect, can play protection AZ31, it is to avoid the oxidized effect of AZ31 skin surface in extrusion process again.Using the present embodiment side
The AZ31 magnesium alloy plate any surface finish that method is obtained, fine and close high, can be used for preparing this shell of notebook computer.
Embodiment 2：
The method that the present embodiment coextrusion mold produces magnesium alloy composite board material, comprises the following steps：
1) (wherein AZ80 magnesium alloy block thickness is AZ31 to take AZ31 magnesium alloy ingot block and AZ80 magnesium alloy ingot block respectively
The 1/5 of magnesium alloy)；
2) polish cleaning step 1) AZ31 magnesium alloy ingot and AZ80 magnesium alloy ingot；
3) by step 2) AZ31 magnesium alloy ingot and AZ80 magnesium alloy ingot be superimposed together and fixed with aluminium wire；
4) by step 3) complex be heated to 400 DEG C insulation 1h after extrude to obtain product；
5) play, using outside the method removal of machine cuts or polishing, the AZ80 magnesium alloy that protection and assistant formation act on
Obtain AZ31 magnesium alloy plate to be prepared.
Embodiment 3：
The method that the present embodiment coextrusion mold produces magnesium alloy composite board material, comprises the following steps：
1) take two block size identicals cylinder magnesium alloy ingot (AZ31) and aluminium alloy cast ingot 5052 and cut open along axis
Open；
2) cleaning step 1) split surface of gained semi-cylindrical magnesium alloy and aluminium alloy cast ingot be polishing to smooth；
3) by step 2) the semi-cylindrical magnesium alloy after polishing is stacked together with aluminium alloy cast ingot that (cutting plane is relative, such as
Shown in Fig. 3) and fix (avoiding producing macroface in extrusion process to slip) with aluminium wire；
4) by step 3) complex be heated to 380 DEG C of insulation 1h after be placed in pressurizing unit and extruded；
5) 400 DEG C of temper steps 4) sheet material extruded obtains product；
6) obtain AZ31 magnesium to be prepared using the aluminium alloy layer that the method for machine cuts or polishing removes composite board
Sheet alloy.
Comparative example 1：
Cylindrical AZ31 magnesium alloy ingot polishing is taken to carry out common symmetric extruding after 400 DEG C.
Performance test：
Example 1 and comparative example 1 gained sheet material carry out metallographic structure analysis and Mechanics Performance Testing, and result is as schemed
Shown in 3-5 and following table：
Fig. 3, Fig. 4 are respectively metallograph and the basal plane texture pattern of embodiment 1 gained composite board, and Fig. 5, Fig. 6 are respectively
The metallograph of embodiment 3 gained sheet material and basal plane texture pattern, Fig. 7, Fig. 8 are respectively comparative example 1 gained magnesium alloy plate
Metallograph and basal plane texture pattern.
The crystal grain that comparison diagram 3-8 can be seen that embodiment 1,3 extruding gained sheet material is substantially refined, basal plane texture journey
Degree also declines to a great extent.
| Classification | Yield strength/MPa | Tensile strength/MPa | Elongation percentage/% |
| Comparative example 1 | 163.3 | 248.5 | 17.1 |
| Embodiment 1 | 145.0 | 281.0 | 21.7 |
| Embodiment 3 | 164.7 | 302.4 | 19.6 |
As can be seen from the above table, compared with comparative example 1, embodiment 1,3 gained stripper plates comprehensive mechanical property bright
The aobvious AZ31 sheet material than common extruding is high.
Above-described embodiment by same or not same material be superimposed together and carry out Compound Extrusion, due to magnesium alloy plate
Between Presence of an interface, different magnesium alloy block/plates will not occur relative flow in extrusion process；Same magnesium alloy in extrusion process
There is larger shear stress, thus playing reduction texture effect between block.
The method that the present embodiment coextrusion mold produces magnesium alloy composite board material only need to change extrusion cladding mode, need not be again
Design extrusion die, it is only necessary to change sample complex form, has stronger production and researching value.
Finally illustrate, preferred embodiment above only in order to technical scheme to be described and unrestricted, although logical
Cross above preferred embodiment the present invention to be described in detail, it is to be understood by those skilled in the art that can be
In form and various changes are made to it, without departing from claims of the present invention limited range in details.
Claims (2)
1. the pressing method of texture attenuation magnesium alloy plate is it is characterised in that comprise the following steps：
1）, take at least two blocks xenogenesis magnesium alloys and overlap fixing or take magnesium alloy and Al alloy block and overlap fixation；
2）, by step 1）The light-alloy block being superimposed together adds extrusion die to be extruded, and described light-alloy block is from extrusion die
Mouth is synchronous to be extruded, and obtains composite board；
3）, remove composite board in thinner thickness part, obtain texture attenuation magnesium alloy plate；
Described extrusion die is common symmetric extrusion die, and described pressing method is symmetrical extruding；
In extrusion process, same magnesium alloy block extrudes current difference with away from existing at contact interface at contact interface；Extruded
In journey between the magnesium alloy block of each magnesium alloy block contact interface both sides no macroscopic view slide or extrusion process in each magnesium alloy and aluminum close
Between the magnesium alloy of gold bullion contact interface both sides and Al alloy block, no macroscopic view is slided；
Step 1）Selected xenogenesis magnesium alloy is one piece of AZ61 and one piece of AZ31, and wherein the thickness of AZ61 is the thickness 1/10 of AZ31 block
～1/3 or selected xenogenesis magnesium alloy is one piece of AZ80 and one piece of AZ31, wherein AZ80 block thickness be AZ31 block thickness 1/15～
1/3；
Step 1）Selected magnesium alloy and Al alloy block include one block of AZ31 and one block of Al alloy, and the thickness of wherein Al alloy block is
The thickness 1/10～1/3 of AZ31 block, described Al alloy is 5052 or 6063.
2. according to claim 1 texture attenuation magnesium alloy plate pressing method it is characterised in that：Before overlapping alloy block also
Including alloy block contact surface is carried out with smooth step, also include alloy block is carried out before extrusion molding after overlapping alloy block
The step of heating.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410608274.9A CN104492847B (en) | 2014-10-30 | 2014-10-30 | Extruding method for texture-weakened magnesium alloy sheet |
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| CN201410608274.9A CN104492847B (en) | 2014-10-30 | 2014-10-30 | Extruding method for texture-weakened magnesium alloy sheet |
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| CN104492847B true CN104492847B (en) | 2017-02-15 |
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| CN106399884B (en) * | 2016-10-27 | 2018-03-20 | 重庆科技学院 | The new method for processing of high-performance magnesium-alloy section bar |
| CN106513453B (en) * | 2016-11-18 | 2018-10-16 | 山东科技大学 | A kind of non-crystaline amorphous metal thermal-squeezing device and method |
| CN106391743B (en) * | 2016-11-18 | 2018-03-06 | 山东科技大学 | A kind of pressurizing unit and method for connecting magnesium alloy and aluminium alloy |
| CN109985922B (en) * | 2017-12-29 | 2021-06-29 | 南京理工大学 | Preparation method of multi-grain-size reinforced magnesium alloy material |
| CN109940094B (en) * | 2019-04-19 | 2021-04-16 | 重庆科技学院 | Mold and method for regulating and controlling formability of magnesium alloy plate through gradient strain |
| CN110434187B (en) * | 2019-06-19 | 2020-08-07 | 广东坚美铝型材厂（集团）有限公司 | Extrusion method of high-brittleness aluminum alloy and high-brittleness aluminum alloy extrusion piece |
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| CN101590493A (en) * | 2009-06-12 | 2009-12-02 | 中国兵器工业第五二研究所 | A kind of equal-channel reciprocating extrusion magnesium alloy with back pressure preparation method and extrusion die thereof |
| CN102794321A (en) * | 2012-08-17 | 2012-11-28 | 天津金源工业技术服务有限公司 | Preparation process of composite bimetallic wire substrate |
| 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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|---|---|---|---|---|
| CN100421830C (en) * | 2007-05-09 | 2008-10-01 | 中国科学院金属研究所 | Method for preparing lamellar composite material of heterogeneic alloy |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101590493A (en) * | 2009-06-12 | 2009-12-02 | 中国兵器工业第五二研究所 | A kind of equal-channel reciprocating extrusion magnesium alloy with back pressure preparation method and extrusion die thereof |
| CN102794321A (en) * | 2012-08-17 | 2012-11-28 | 天津金源工业技术服务有限公司 | Preparation process of composite bimetallic wire substrate |
| 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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