CN104492847A - Extruding method for texture-weakened magnesium alloy sheet - Google Patents
Extruding method for texture-weakened magnesium alloy sheet Download PDFInfo
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- CN104492847A CN104492847A CN201410608274.9A CN201410608274A CN104492847A CN 104492847 A CN104492847 A CN 104492847A CN 201410608274 A CN201410608274 A CN 201410608274A CN 104492847 A CN104492847 A CN 104492847A
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- magnesium alloy
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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
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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
- 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
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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
- 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, relate to magnesium alloy molded method, particularly by the method for compound extrusion forming method production high strength, low texture magnesium alloy plate.
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 is complicated, the production cycle is long, efficiency is low, 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 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 a kind of method by compound extrusion forming method production high strength, low texture magnesium alloy plate.
For achieving the above object, the invention provides following technical scheme:
The pressing method of texture attenuation magnesium alloy plate, comprises the following steps:
1), being taken to few two blocks of xenogenesis magnesium alloys or magnesium alloy with Al alloy block superimposedly fixes;
2), by step 1) the light-alloy block that is superimposed together adds extrusion die and extrudes, and described light-alloy block is synchronously extruded from extruding die orifice, obtains composite board;
3), remove thinner thickness part in composite board, obtain texture attenuation magnesium alloy plate.Preferably, step 1) there is notable difference in described magnesium alloy or the forming property between magnesium alloy and aluminium alloy
Preferably, step 1) selected light-alloy is one piece of AZ61 and piece AZ31, wherein the thickness of AZ61 is the thickness 1/10 ~ 1/3 of AZ31 block.
Preferably, step 1) selected magnesium alloy is one piece of AZ80 and piece AZ31, wherein AZ80 block thickness is the thickness 1/15 ~ 1/3 of AZ31 block.
Preferably, step 1) selected light-alloy comprises one piece of AZ31 and block Al alloy, and wherein the thickness of Al alloy block is the thickness 1/10 ~ 1/3 of AZ31 block.
Preferably, in extrusion process, same magnesium alloy block extrude current difference near contact interface place with existing away from contact interface place, in extrusion process each magnesium alloy block contact interface both sides magnesium alloy block between without macroscopical slip.
Preferably, also comprise before superimposed alloy block and carry out cleaning smooth step to each alloy block contact surface, before extruded after superimposed alloy block, also comprise the step that involutory gold bullion carries out heating.
Preferably, sander grinding is adopted to remove thinner magnesium layer or the aluminium lamination of composite board.
Beneficial effect of the present invention is:
First two blocks of magnesium alloys or magnesium alloy are carried out synchronous extruding with aluminium alloy compound together obtain composite board by the present invention, and outside then removing composite board, thinner layer obtains required magnesium alloy extrusion sheet material, Presence of an interface between magnesium alloy block in extrusion process, what hinder between extrusion billet is thick in relative flowing, and blank is transversely extended with longitudinal Uniform Flow, the magnesium alloy flowing velocity of interface substantially identical (in extrusion process, each blank interface there is no macroscopic view slip) during extruding, and away from contact interface place because the deformation performance of different-alloy block is different, AZ61, AZ80 or 5052, the deformation performance of 6063 is poor relative to AZ31, during extruding, material flow rate is slower, and the squeezing flow speed of AZ31, there is larger difference in their squeezing flow speed, thus the gradient existed along thickness strains in AZ31 magnesium alloy block, there is larger shear stress, not only play the effect of crystal grain thinning, crystal grain also can be made to vert, thus weaken the basal plane texture of AZ31 sheet material.After adopting general sander grinding to remove thinner magnesium alloy or aluminium alloy layer, not only can obtain single AZ31 sheet material, also can ensure its good flatness.The magnesium alloy crystal grain that then Compound Extrusion of the present invention peels off outside thinner layer obtains obvious refinement, and basal plane texture significantly weakens.
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 the superimposed schematic diagram of embodiment 1 magnesium alloy ingot;
Fig. 2 is the superimposed schematic diagram of embodiment 3 magnesium alloy ingot;
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.
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 present embodiment coextrusion mold produces the method for magnesium alloy composite board material, comprises the following steps:
1) two pieces of semi-cylindrical AZ31 magnesium alloy ingots and AZ61 magnesium alloy ingot (AZ61 thickness is about 1/4 of AZ31) is got respectively;
2) cleaning step 1) split surface of gained semi-cylindrical AZ31 magnesium alloy ingot and AZ61 magnesium alloy ingot polishing be to smooth;
3) by step 2) semi-cylindrical AZ31 magnesium alloy ingot after polishing is superimposed together with AZ61 magnesium alloy ingot that (cutting plane is relative, as shown in Figure 1) and fix (avoid in extrusion process, producing macroscopical relative sliding, should fit tightly seamless between sheet material simultaneously) with aluminium wire;
4) 400 DEG C of pressing steps 3) complex obtain composite board;
5) the AZ61 magnesium alloy layer utilizing the method for machine cuts or polishing to remove composite board obtains AZ31 magnesium alloy plate to be prepared.
The present embodiment utilizes AZ61 and AZ31 co-extrusion to produce AZ31 magnesium alloy plate, and AZ61 both can play the effect of assistant formation, can play again protection AZ31, avoid the effect that in extrusion process, AZ31 skin surface is oxidized.Adopt the AZ31 magnesium alloy plate any surface finish that the present embodiment method is obtained, fine and close high, can be used for this shell of preparation notes computer.
Embodiment 2:
The present embodiment coextrusion mold produces the method for magnesium alloy composite board material, comprises the following steps:
1) AZ31 casting of magnesium alloy ingot bar and AZ80 casting of magnesium alloy ingot bar (wherein AZ80 magnesium alloy block thickness is 1/5 of AZ31 magnesium alloy) is got respectively;
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 fix with aluminium wire;
4) by step 3) complex be heated to 400 DEG C insulation 1h after extrude to obtain product;
5) the AZ80 magnesium alloy utilizing the method for machine cuts or polishing removal outside to play protection and assistant formation effect obtains AZ31 magnesium alloy plate to be prepared.
Embodiment 3:
The present embodiment coextrusion mold produces the method for magnesium alloy composite board material, comprises the following steps:
1) get two pieces of measure-alike cylindrical magnesium alloy ingots (AZ31) and aluminium alloy cast ingot 5052 and cut open along axis;
2) cleaning step 1) split surface of gained semi-cylindrical magnesium alloy and aluminium alloy cast ingot polishing be to smooth;
3) by step 2) semi-cylindrical magnesium alloy after polishing is stacked together with aluminium alloy cast ingot, and (cutting plane is relative, as shown in Figure 3) and fix (avoiding producing macroscopical relative sliding in extrusion process) with aluminium wire;
4) by step 3) complex be heated to 380 DEG C of insulation 1h and be placed on pressurizing unit and extrude;
5) 400 DEG C of temper steps 4) sheet material extruded obtains product;
6) aluminium alloy layer utilizing the method for machine cuts or polishing to remove composite board obtains AZ31 magnesium alloy plate to be prepared.
Comparative example 1:
Common symmetric extruding is carried out in 400 DEG C after getting the polishing of cylindrical AZ31 magnesium alloy ingot.
Performance test:
Example 1 and comparative example 1 gained sheet material carry out metallographic structure analysis and Mechanics Performance Testing, and result is as shown in Fig. 3-5 and following table:
Fig. 3, Fig. 4 are respectively metallograph and the basal plane texture pattern of embodiment 1 gained composite board, Fig. 5, Fig. 6 are respectively metallograph and the basal plane texture pattern of embodiment 3 gained sheet material, and Fig. 7, Fig. 8 are respectively metallograph and the basal plane texture pattern of comparative example 1 gained magnesium alloy plate.
Comparison diagram 3-8 can find out, the crystal grain that embodiment 1,3 extrudes gained sheet material obtains obvious refinement, and basal plane texture degree also declines to a great extent.
| Classification | Yield strength/MPa | Tensile strength/MPa | Percentage elongation/% |
[0059]
| 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, the comprehensive mechanical property of embodiment 1,3 gained stripper plate is obviously high than the AZ31 sheet material of common extruding.
Same or non-same material are superimposed together and carry out Compound Extrusion by above-described embodiment, and due to Presence of an interface between magnesium alloy plate, different magnesium alloy block/plate, in extrusion process, relative flowing can not occur; There is larger shear stress between same magnesium alloy block in extrusion process, thus play the effect of reduction texture.
The method that the present embodiment coextrusion mold produces magnesium alloy composite board material only need change extrusion cladding mode, without the need to redesigning extrusion die, only needing to change sample complex form, having stronger production and researching value.
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 (6)
1. the pressing method of texture attenuation magnesium alloy plate, is characterized in that, comprises the following steps:
1), being taken to few two blocks of xenogenesis magnesium alloys or magnesium alloy with Al alloy block superimposedly fixes;
2), by step 1) the light-alloy block that is superimposed together adds extrusion die and extrudes, and described light-alloy block is synchronously extruded from extruding die orifice, obtains composite board;
3), remove thinner thickness part in composite board, obtain texture attenuation magnesium alloy plate.
2. the pressing method of texture attenuation magnesium alloy plate according to claim 2, is characterized in that: step 1) selected magnesium alloy is one piece of AZ61 and piece AZ31, wherein the thickness of AZ61 is the thickness 1/10 ~ 1/3 of AZ31 block.
3. the pressing method of texture attenuation magnesium alloy plate according to claim 3, is characterized in that: step 1) selected magnesium alloy is one piece of AZ80 and piece AZ31, wherein AZ80 block thickness is the thickness 1/15 ~ 1/3 of AZ31 block.
4. the pressing method of texture attenuation magnesium alloy plate according to claim 2, is characterized in that: step 1) selected alloy comprises one piece of AZ31 and block Al alloy, and wherein the thickness of Al alloy block is the thickness 1/10 ~ 1/3 of AZ31 block.
5. the pressing method of texture attenuation magnesium alloy plate according to claim 1, it is characterized in that: in extrusion process, same magnesium alloy block extrude current difference near contact interface place with existing away from contact interface place, in extrusion process each magnesium alloy block contact interface both sides magnesium alloy block between without macroscopical slip.
6. the pressing method of texture attenuation magnesium alloy plate according to claim 1, it is characterized in that: also comprise involutory gold bullion contact surface before superimposed alloy block and carry out cleaning smooth step, before extruded after superimposed alloy block, also comprise the step that involutory gold bullion carries out heating.
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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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Cited By (6)
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| CN106391743A (en) * | 2016-11-18 | 2017-02-15 | 山东科技大学 | Extrusion device and method for connecting magnesium alloy with aluminum alloy |
| CN106399884A (en) * | 2016-10-27 | 2017-02-15 | 重庆科技学院 | Novel method for preparation and processing of high-performance magnesium alloy profile |
| CN106513453A (en) * | 2016-11-18 | 2017-03-22 | 山东科技大学 | Amorphous alloy hot extrusion device and method |
| CN109940094A (en) * | 2019-04-19 | 2019-06-28 | 重庆科技学院 | A kind of mold and method of gradient strain regulation magnesium alloy plate formability |
| CN109985922A (en) * | 2017-12-29 | 2019-07-09 | 南京理工大学 | A kind of preparation method of multiple grain scale reinforced magnesium alloy material |
| CN110434187A (en) * | 2019-06-19 | 2019-11-12 | 广东坚美铝型材厂（集团）有限公司 | A kind of pressing method and high brittleness aluminum alloy extrusion of high brittleness aluminium alloy |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106399884A (en) * | 2016-10-27 | 2017-02-15 | 重庆科技学院 | Novel method for preparation and processing of high-performance magnesium alloy profile |
| CN106391743A (en) * | 2016-11-18 | 2017-02-15 | 山东科技大学 | Extrusion device and method for connecting magnesium alloy with aluminum alloy |
| CN106513453A (en) * | 2016-11-18 | 2017-03-22 | 山东科技大学 | Amorphous alloy hot extrusion 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 |
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| CN109985922A (en) * | 2017-12-29 | 2019-07-09 | 南京理工大学 | A kind of preparation method of multiple grain scale reinforced magnesium alloy material |
| CN109940094A (en) * | 2019-04-19 | 2019-06-28 | 重庆科技学院 | A kind of mold and method of gradient strain regulation magnesium alloy plate formability |
| CN110434187A (en) * | 2019-06-19 | 2019-11-12 | 广东坚美铝型材厂（集团）有限公司 | A kind of pressing method and high brittleness aluminum alloy extrusion of high brittleness aluminium alloy |
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