CN110722013A - Method for rolling magnesium-aluminum laminated plate by drum-shaped corrugated roller - Google Patents
Method for rolling magnesium-aluminum laminated plate by drum-shaped corrugated roller Download PDFInfo
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- CN110722013A CN110722013A CN201910896973.0A CN201910896973A CN110722013A CN 110722013 A CN110722013 A CN 110722013A CN 201910896973 A CN201910896973 A CN 201910896973A CN 110722013 A CN110722013 A CN 110722013A
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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
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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Abstract
The invention relates to the field of processing of metal laminated plate strips, in particular to a method for rolling a magnesium-aluminum laminated plate by a drum-shaped corrugated roller. Selecting magnesium alloy plates with the same length and width as clad plates and pure aluminum or aluminum alloy plates as base plates, cleaning the surfaces of the metal plates, and buckling and assembling the base plates and the polished surfaces of the clad plates together or buckling and stacking and assembling the base plates and the clad plates together. When the drum-shaped roller is used for rolling the magnesium-aluminum laminated plate in the first pass, a stress peak can be formed on the lowest metal interface of the laminated plate, and the combination of the middle part of the laminated plate and the wave trough of the corrugated interface is promoted. In the second rolling process, stress peaks are formed on the edges of the laminated plate with poor bonding and metal interfaces at wave crests during the first rolling of the plate, and large plastic deformation is generated at the same time, so that the bonding of the edges of the laminated plate is promoted. The process has two rolling steps, and can promote the bonding of the whole interface and improve the bonding strength of the interface of the laminated plate.
Description
Technical Field
The invention relates to the field of processing of metal laminated plate strips, in particular to a method for rolling a magnesium-aluminum laminated plate by a drum-shaped corrugated roller.
Background
The magnesium alloy has the advantages of low density, high specific strength, high specific rigidity, good heat and electricity conductivity and good cutting performance, is known as a green engineering material in the 21 st century, and is the lightest metal structural material capable of realizing industrial application at present. But the defect of non-corrosion resistance greatly limits the wide application of magnesium alloy in various industries. The aluminum alloy which is light metal has good corrosion resistance and plastic forming performance, good surface repairability and repairability, and the aluminum element is also an alloy element which is applied to magnesium alloy most and is used for improving the strength and the corrosion resistance. Therefore, the magnesium-aluminum laminated plate with the advantages of light weight of the magnesium alloy and corrosion resistance of the aluminum alloy can be obtained by covering the surface of the magnesium alloy with a layer of aluminum alloy. It can be expected that various thin-wall parts prepared by stamping the novel light-weight, high-strength and good-corrosion-resistance magnesium-aluminum laminated plate can be widely applied to the industrial fields of aerospace, automobiles, 3C and the like.
The traditional magnesium/aluminum laminated plate rolling and compounding method has the following problems:
due to the special close-packed hexagonal crystal structure of the magnesium alloy, the plastic deformation under the room temperature condition is limited to basal plane {0001} <1120> slippage and conical plane {1012} <1011> twinning, only 3 geometric slippage systems and 2 independent slippage systems exist, the plastic deformation is difficult, the edge crack is easily generated in the rolling process of the magnesium/aluminum laminated plate due to the larger plastic deformation, the generation of the edge crack has larger influence on the performance of the plate, the yield of the plate is greatly reduced, and the production cost is increased.
Related studies have shown that large plastic deformation and strong normal stress can effectively promote bonding between metal laminates. The rolling plastic deformation of the conventional magnesium/aluminum laminate is too small, and the bonding strength of the laminate is too low or cannot be bonded at all. The corrugated roller is adopted to roll the laminated plate, so that the deformation of the metal difficult to deform on the corrugated roller side can be effectively promoted, and meanwhile, the stress peak is formed at the wave trough to promote the high-strength bonding of a local interface. And then flattening by adopting a flat roller, so that a stress peak value is formed again at the wave crest, and the bonding strength of the magnesium-aluminum laminated plate interface is comprehensively improved. However, the edge cracks are obviously generated due to the severe deformation of the magnesium alloy in the second pass, and the enlarged view of the edge cracks is shown in FIG. 7. The yield of the magnesium-aluminum laminated plate is greatly reduced, and meanwhile, great potential safety hazards are brought to the use of materials.
Therefore, it is necessary to develop a process for improving the bonding strength of the laminate and reducing edge cracks of the magnesium/aluminum laminate.
Disclosure of Invention
The invention aims to solve the technical problems of low interface bonding strength, serious edge crack and poor mechanical property in the production of a magnesium-aluminum laminated plate, and provides a method for rolling a magnesium-aluminum laminated plate by a drum-shaped corrugated roller.
The invention is realized by the following technical scheme: a method of drum corrugating a magnesium aluminum laminate comprising the steps of:
1) blank preparation: selecting magnesium alloy plates with the same length and width as clad plates and pure aluminum or aluminum alloy plates as base plates, cleaning the surfaces of the metal plates, and buckling and assembling the base plates and the polished surfaces of the clad plates together or buckling and stacking and assembling the base plates and the clad plates together;
2) heating: the assembled plate blank is sent to a heating furnace to be directly heated or heated in an inert atmosphere protective environment and a vacuum environment;
3) rolling a drum-shaped corrugated roller: rolling and compounding the magnesium-aluminum laminated plate blank by adopting a two-roll mill provided with drum-shaped corrugated rolls to obtain a magnesium-aluminum corrugated laminated plate;
4) reheating: heating the magnesium-aluminum corrugated laminated plate which is rolled and compounded by adopting a drum-shaped corrugated roller again;
5) flat rolling: the heated magnesium-aluminum corrugated laminated plate is put into a two-roll mill with flat rolls on the upper and lower rolls for rolling to obtain the magnesium-aluminum corrugated laminated plate with flat surface and corrugated bonding interface;
6) annealing: annealing the rolled flat magnesium-aluminum laminated plate in an inert atmosphere protective environment or a vacuum environment, and then cooling;
7) and (3) finishing: then straightening, cutting head, cutting tail, trimming, and finally binding and packaging.
As a further improvement of the technical solution of the present invention, the assembly form of the slab includes: Mg/Al, Mg/Al/Mg, Mg/Al/release agent/Al/Mg.
As a further improvement of the technical scheme of the invention, in the rolling process of the drum-shaped corrugated roller in the step 3), the combination of the upper roller system and the lower roller system of the two-roller rolling mill can be a drum-shaped corrugated roller plus a common flat roller, a drum-shaped corrugated roller plus a drum-shaped flat roller, and both the upper roller system and the lower roller system can be drum-shaped corrugated rollers.
As a further improvement of the technical scheme of the invention, when the assembly form of the slab is an asymmetric form, the drum-shaped corrugated roller is positioned on the side of the magnesium alloy plate, and the common flat roller or the drum-shaped flat roller is positioned on the side of the pure aluminum or aluminum alloy plate; when the assembly form of the plate blank is a symmetrical form, the upper side and the lower side of the plate blank are both drum-shaped corrugated rollers.
As a further improvement of the technical scheme of the invention, in the blank manufacturing process in the step 1), the surface of the metal plate is cleaned by steel wire brush polishing, shot blasting, sand paper abrasive belt polishing, chemical reagent cleaning or electrochemical corrosion.
As a further improvement of the technical scheme of the invention, in the heating process in the step 2), the heating time is 0.1-3 h, and the heating temperature is 200-600 ℃.
As a further improvement of the technical scheme of the present invention, in the rolling process of the drum-shaped corrugated roller in the step 3), the drum-shaped corrugated roller is a drum-shaped corrugated embossing roller with a certain number of periodic patterns engraved on the surface, wherein the relationship between the drum-shaped height H and the roller length L satisfies: H/L is more than 0 and less than or equal to 0.3.
As a further improvement of the technical scheme of the invention, in the rolling process of the drum-shaped corrugated roll in the step 3), before the plate blank enters the rolling mill, the centering operation is required to be carried out, so that the middle part of the plate blank is aligned with the lowest point G of the drum-shaped corrugated roll.
As a further improvement of the technical solution of the present invention, in the step 5) of the flat roll rolling process, the thickness H1 of the middle part of the plate, the thickness H2 of the edge part, the thickness H3 of the flat rolled plate in the second pass, the thickness H1 of the original magnesium plate and the thickness H2 of the aluminum plate after the first pass of the flat roll rolling process satisfy: 0 < 1-H1/(H1+ H2) < 0.5, 0 < (H2-H3)/H2 < 0.6.
As a further improvement of the technical scheme of the invention, in the annealing process in the step 6), the annealing temperature is 300-500 ℃, the annealing time is 20-60 min, and air cooling is carried out after the annealing is finished.
Compared with the prior art, the invention has the following beneficial effects:
1. when the drum-shaped roller is used for rolling the magnesium-aluminum laminated plate in the first pass, a stress peak can be formed on the lowest metal interface of the laminated plate, and the combination of the middle part of the laminated plate and the wave trough of the corrugated interface is promoted. In the second rolling process, stress peaks are formed on the edges of the laminated plate with poor bonding and metal interfaces at wave crests during the first rolling of the plate, and large plastic deformation is generated at the same time, so that the bonding of the edges of the laminated plate is promoted. Compared with the traditional rolling process of the magnesium-aluminum laminated plate, the process has the advantages that the rolling process is carried out twice, the bonding of the whole interface is promoted, and the bonding strength of the laminated plate interface is improved;
2. because the temperature drop of the magnesium alloy has great influence on the plasticity of the plate, the temperature drop of the edge of the plate is fast, and edge cracking is easily caused in the rolling process. When the process is adopted for rolling, the deformation of the edge part is smaller in the first rolling process, the deformation of the middle part is larger, the plasticity characteristic of the whole plate is coordinated, and the edge crack of the laminated plate can be effectively reduced;
3. the drum-shaped corrugated roller is adopted to roll the magnesium-aluminum laminated plate, so that the stress and strain distribution of the edges of the magnesium and aluminum plates can be effectively changed, the edges and the middle metal can flow as synchronously as possible, the crystal grain dislocation of the edges is reduced, fine crystal grains at the positions of the edges which are easy to crack are reduced, the tissue uniformity of the middle area is improved, the edge damage of the magnesium plate is reduced, and the edge crack of the magnesium-aluminum laminated plate is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is an assembly diagram of the magnesium-aluminum composite plate blank of the invention. In the figure: 1-magnesium alloy plate, 2-pure aluminum or aluminum alloy plate, g-separant and 3-plate blank.
Fig. 2 is a schematic view of the configuration of a crowned corrugating roll according to the present invention. In the figure: (a) the figure is a front view of the crowned corrugating roller, (b) is a side view of the crowned corrugating roller, (c) is a cross-sectional view A-A of the crowned corrugating roller, and (d) is a partial enlarged view of I in figure (c).
Fig. 3 is a process flow chart of the method for rolling and flat rolling the double-layer magnesium-aluminum composite plate by using the drum-shaped corrugated roller and the common flat roller. In the figure: (a) the figure is a process flow diagram, wherein 1-magnesium alloy plate, 2-pure aluminum or aluminum alloy plate, 4-heating furnace, 5-drum-shaped corrugated roller, 6-common flat roller, 7-magnesium aluminum corrugated laminated plate and 8-magnesium aluminum laminated plate. (b) The figure is a schematic diagram of the P direction of the plate, and the figure (c) is a schematic diagram of the F direction of the plate.
Fig. 4 is a process flow chart of the method for rolling and flat rolling the drum-shaped corrugated rollers of various magnesium-aluminum composite plates.
Fig. 5 is a plate shape diagram of a corrugated interface magnesium-aluminum composite plate obtained by the method of rolling by the drum-shaped corrugated roller and the flat rolling in step 5) in the method described in embodiment 1 of the present invention.
Fig. 6 is a sheet form diagram of a first two-pass flat rolled magnesium aluminum laminate of step 5) of the method of comparative example 1 of the present invention.
Fig. 7 is a sheet form of a second magnesium aluminum laminate obtained by the conventional corrugated roll rolling plus flat rolling method of step 5) of the method of comparative example 2 according to the present invention.
Fig. 8 is a process flow chart of the rolling and flat rolling method of the double-layer magnesium-aluminum composite plate by the drum-shaped corrugated roller and the drum-shaped flat roller. In the figure: (d) the figure is a process flow diagram, wherein 1-magnesium alloy plate, 2-pure aluminum or aluminum alloy plate, 4-heating furnace, 5-drum-shaped corrugated roller and 9-drum-shaped flat roller. (e) The figure is a schematic diagram of the direction R of the plate, and the figure (f) is a schematic diagram of the direction E of the plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
A method of drum corrugating a magnesium aluminum laminate comprising the steps of:
1) blank preparation: selecting magnesium alloy plates with the same length and width as clad plates and pure aluminum or aluminum alloy plates as base plates, cleaning the surfaces of the metal plates, and buckling and assembling the base plates and the polished surfaces of the clad plates together or buckling and stacking and assembling the base plates and the clad plates together;
2) heating: the assembled plate blank is sent to a heating furnace to be directly heated or heated in an inert atmosphere protective environment and a vacuum environment;
3) rolling a drum-shaped corrugated roller: rolling and compounding the magnesium-aluminum laminated plate blank by a two-roll mill with an upper roll as a drum-shaped corrugated roll and a lower roll as a common flat roll to obtain a magnesium-aluminum corrugated laminated plate;
4) reheating: heating the rolled and compounded magnesium-aluminum corrugated laminated plate again;
5) flat rolling: the heated magnesium-aluminum corrugated laminated plate is put into a two-roll mill with common flat rolls on the upper and lower rolls for rolling to obtain the magnesium-aluminum laminated plate with a flat surface and a corrugated bonding interface;
6) annealing: annealing the rolled flat magnesium-aluminum laminated plate in an inert atmosphere protective environment or a vacuum environment, and then cooling;
7) and (3) finishing: then straightening, cutting head, cutting tail, trimming, and finally binding and packaging.
In the invention, in the blank manufacturing process of the step 1), the combined slabs need to be jointed by adopting welding or riveting and other processes. Specifically, depending on the difference in the rolling temperature of the sheet material, the degree of surface oxidation, and the like, a joining method in which spot welding is performed around the interface of the billet and vacuum pumping is performed, or a joining method in which the head and the tail of the combined billet are riveted by using a rivet may be used.
Preferably, as shown in fig. 1, the assembled form of the slab comprises: Mg/Al, Mg/Al/Mg, Mg/Al/release agent/Al/Mg. Taking the assembly form in fig. 1 as an example, the snap-fit assembly refers to directly snap-fitting the metal plates together as shown by Mg/Al, Mg/Al/Mg, and the snap-fit and stack-up assembly refers to coating a release agent between two Mg/Al and stacking the two Mg/Al as shown by Mg/Al/release agent/Al/Mg. Wherein Mg means a magnesium alloy plate, and Al means pure aluminum or an aluminum alloy plate.
Specifically, in the rolling process of the drum-shaped corrugated roller in the step 3), the upper and lower roller systems of the two-roller rolling mill can be combined by a drum-shaped corrugated roller and a common flat roller, a drum-shaped corrugated roller and a drum-shaped flat roller, and the upper and lower rollers are drum-shaped corrugated rollers.
Further, when the assembled form of the plate blank is an asymmetric form, the drum-shaped corrugated roller is positioned on the side of the magnesium alloy plate, and the common flat roller or the roller-shaped flat roller is positioned on the side of the pure aluminum or aluminum alloy plate; when the assembly form of the plate blank is a symmetrical form, the upper side and the lower side of the plate blank are both drum-shaped corrugated rollers.
Furthermore, in the blank manufacturing process in the step 1), the surface of the metal plate is cleaned by steel wire brush polishing, shot blasting, abrasive paper belt polishing, chemical reagent cleaning or electrochemical corrosion.
Wherein the evacuated slabs can be directly heated. The plate blank subjected to head-tail riveting needs to be heated in an inert atmosphere protective environment or a vacuum environment so as to reduce oxidation of a metal grinding surface. The heating temperature and heating time are determined according to the specific rolling process, and the approximate range is as follows: the heating time is 0.1 to 3 hours, and the heating temperature is 200 to 600 ℃.
Specifically, in the rolling process of the drum-shaped corrugated roller in the step 3), the drum-shaped corrugated roller is a drum-shaped corrugated pattern roller with a certain number of periodic patterns engraved on the surface, wherein the relationship between the drum-shaped height H and the roller body length L satisfies the following requirements: H/L is more than 0 and less than or equal to 0.3. Wherein, the wave shape can be a curve or a broken line such as an arc, a sine, a cosine, a trapezoid, a triangle and the like.
Preferably, during the rolling process of the crowned corrugating roll in the step 3), the slab needs to be centered before entering the rolling mill, so that the middle part of the slab is aligned with the lowest point G of the crowned corrugating roll.
Further, in the step 5) of flat rolling, the thickness H1 of the middle part and the thickness H2 of the edge part of the plate after the first pass of drum-shaped corrugation rolling, the flat rolling thickness H3 of the second pass of flat rolling, the original thickness H1 of the magnesium plate and the thickness H2 of the aluminum plate meet the following requirements: 0 < 1-H1/(H1+ H2) < 0.5, 0 < (H2-H3)/H2 < 0.6.
Further, in the annealing process in the step 6), the annealing temperature is 300-500 ℃, the annealing time is 20-60 min, and air cooling is performed after the annealing is finished.
The technical solution of the present invention will be described in detail by the following specific examples.
Example 1
The magnesium/aluminum laminate sheet was prepared using the method shown in FIG. 3:
1) blank preparation: selecting an AZ31 magnesium alloy plate with the length and width of 200mm (length) × 50mm (width) × 2mm (height) as a composite plate 1 and a 1060 aluminum plate with the length of 200mm (length) × 50mm (width) × 2mm (height) as a base plate 2, polishing and cleaning the surface of the metal plate by a steel wire brush with the diameter of 0.3mm, buckling the polished surfaces of the base plate 2 and the composite plate 1 together, and riveting the buckled plate blank 3 by using a rivet;
2) heating: heating the assembled plate blank 3 for 20min in an argon atmosphere protective environment, wherein the heating temperature is 350 ℃;
3) rolling a drum-shaped corrugated roller: the plate blank 3 is rolled and compounded by a two-roller rolling mill which is provided with an upper roller which is a drum-shaped corrugated roller 5 and a lower roller which is a common flat roller 6, and the average diameters of the upper roller and the lower roller are as follows: d is 150mm, the drum height H and the roller body length L are respectively 2mm and 150mm, the rolling reduction rate is 35%, and the magnesium-aluminum corrugated laminated plate 7 is obtained by rolling.
4) Heating, namely heating the magnesium-aluminum corrugated laminated plate 7 which is rolled and compounded by a two-roll mill with an upper roll being a drum-shaped corrugated roll 5 and a lower roll being a common flat roll 6 for 10min again at 350 ℃ under the argon protective atmosphere to make up the heat lost in the rolling process, thereby ensuring the plastic deformation capacity of metal;
5) flat rolling: and (3) placing the heated magnesium-aluminum corrugated laminated plate 7 into a two-roll mill with upper and lower rolls both being common flat rolls 6 for rolling, wherein the diameter of each roll is as follows: d is 150mm, the rolling reduction rate is 25%, and the magnesium-aluminum laminated plate 8 with a flat surface and a corrugated bonding interface is obtained by rolling;
6) annealing: air-cooling the rolled flat magnesium-aluminum laminated plate 8;
7) and (3) finishing: then straightening, cutting head, cutting tail, trimming, and finally binding and packaging.
Comparative example 1
1) Blank preparation: selecting an AZ31 magnesium alloy plate with the length and width of 200mm (length) × 50mm (width) × 2mm (height) as a composite plate (1) and a 1060 aluminum plate with the length of 200mm (length) × 50mm (width) × 2mm (height) as a base plate 2, polishing and cleaning the surface of the metal plate by a steel wire brush with the diameter of 0.3mm, buckling the polished surfaces of the base plate 2 and the composite plate 1 together, and riveting the buckled laminated plate blank 3 by using a rivet;
2) heating: heating the assembled laminated plate blank 3 for 20min in an argon atmosphere protective environment, wherein the heating temperature is 350 ℃;
3) flat rolling: the plywood plate blank 3 is rolled and compounded by adopting a two-roller mill with an upper roller and a lower roller which are common flat rollers, wherein the diameters of the upper roller and the lower roller are as follows: d is 150mm, the rolling reduction rate is 35%, and the first magnesium-aluminum laminated plate is obtained by rolling.
4) Heating, namely heating the first magnesium-aluminum laminated plate again for 10min at 350 ℃ under the argon protection atmosphere to make up the heat lost in the rolling process, so that the plastic deformation capacity of metal is ensured;
5) flat rolling: and (3) placing the heated first magnesium-aluminum laminated plate into a two-roll mill with upper and lower rolls both being common flat rolls 6 to carry out second-pass rolling, wherein the diameters of the rolls are as follows: d is 150mm, the rolling reduction rate is 25%, and the first magnesium-aluminum laminated plate after two times of flat rolling is obtained;
6) annealing: air cooling the magnesium-aluminum laminated plate;
7) and (3) finishing: then straightening, cutting head, cutting tail, trimming, and finally binding and packaging.
Comparative example 2
1) Blank preparation: selecting an AZ31 magnesium alloy plate with the length and width of 200mm (length) × 50mm (width) × 2mm (height) as a composite plate (1) and a 1060 aluminum plate with the length of 200mm (length) × 50mm (width) × 2mm (height) as a base plate 2, polishing and cleaning the surface of the metal plate by a steel wire brush with the diameter of 0.3mm, buckling the polished surfaces of the base plate 2 and the composite plate 1 together, and riveting the buckled laminated plate blank 3 by using a rivet;
2) heating: heating the assembled laminated plate blank 3 for 20min in an argon atmosphere protective environment, wherein the heating temperature is 350 ℃;
3) rolling by using a corrugated roller: adopt the upper roll to be ordinary corrugated roller 5, the lower roll is rolling compound to plywood slab 3 for the two roll mill of ordinary plain-barreled roll 6, and the average diameter of upper and lower roll is: d is 150mm, the drum height H and the roller body length L are respectively 2mm and 150mm, the rolling reduction rate is 35%, and the second magnesium-aluminum laminated plate is obtained by rolling.
4) Heating, namely heating the second magnesium-aluminum laminated plate again for 10min at 350 ℃ under the argon protection atmosphere to make up the heat lost in the rolling process, so that the plastic deformation capacity of the metal is ensured;
5) flat rolling: and (3) placing the heated second magnesium-aluminum laminated plate into a two-roll mill with upper and lower rolls both being common flat rolls 6 to carry out second pass rolling, wherein the diameters of the rolls are as follows: d is 150mm, the rolling reduction rate is 25%, and a second magnesium-aluminum laminated plate with a straight surface and a corrugated interface is obtained;
6) annealing: air cooling the magnesium-aluminum laminated plate;
7) and (3) finishing: then straightening, cutting head, cutting tail, trimming, and finally binding and packaging.
The performance of the magnesium-aluminum laminate 8 having a corrugated surface at the flat interface in step 5) of the method of example 1 of the present invention and the performance of the laminates obtained by two-pass rolling in comparative example 1 and comparative example 2 were observed (see fig. 5 to 7) and measured, respectively, and the performance was shown in the following table.
As can be seen from the above table: the bonding strength of the magnesium-aluminum corrugated laminated plate continuously rolled by the drum-shaped corrugated roller and the flat roller is obviously higher than that of the magnesium-aluminum corrugated laminated plate continuously rolled by the conventional flat roller for two times, and is very close to that of the magnesium-aluminum corrugated laminated plate continuously rolled by the common corrugated roller and the flat roller. Therefore, the drum-shaped corrugated roller and the flat roller are continuously rolled, so that the advantages that the corrugated roller is rolled to promote the bonding strength of the magnesium-aluminum composite plate can be kept, and the edge crack of the composite plate can be effectively reduced.
Wherein the shear strength is measured in the following manner: the shear strength of each composite board sample is tested on a DNS200 electronic universal tester, the tensile speed is 1mm/min, the size of the shear test sample is formulated according to the GB/T6396-1995 composite board mechanical and technological performance test method, and the test results are shown in the table.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method for rolling magnesium-aluminum laminated plates by using drum-shaped corrugated rollers is characterized by comprising the following steps:
1) blank preparation: selecting magnesium alloy plates with the same length and width as clad plates and pure aluminum or aluminum alloy plates as base plates, cleaning the surfaces of the metal plates, and buckling and assembling the base plates and the polished surfaces of the clad plates together or buckling and stacking and assembling the base plates and the clad plates together;
2) heating: the assembled plate blank is sent to a heating furnace to be directly heated or heated in an inert atmosphere protective environment and a vacuum environment;
3) rolling a drum-shaped corrugated roller: rolling and compounding the magnesium-aluminum laminated plate blank by adopting a two-roll mill provided with drum-shaped corrugated rolls to obtain a magnesium-aluminum corrugated laminated plate;
4) reheating: heating the magnesium-aluminum corrugated laminated plate which is rolled and compounded by adopting a drum-shaped corrugated roller again;
5) flat rolling: the heated magnesium-aluminum corrugated laminated plate is put into a two-roll mill with common flat rolls on the upper and lower rolls for rolling to obtain the magnesium-aluminum laminated plate with a flat surface and a corrugated bonding interface;
6) annealing: annealing the rolled flat magnesium-aluminum laminated plate in an inert atmosphere protective environment or a vacuum environment, and then cooling;
7) and (3) finishing: then straightening, cutting head, cutting tail, trimming, and finally binding and packaging.
2. The method of drum corrugating roll-rolled magnesium aluminum laminated sheet as claimed in claim 1, wherein said assembled form of said sheet blank comprises: Mg/Al, Mg/Al/Mg, Mg/Al/release agent/Al/Mg.
3. The method for rolling the magnesium-aluminum laminated plate by the drum-shaped corrugated roller as claimed in claim 2, wherein in the rolling process of the drum-shaped corrugated roller, the upper roller and the lower roller of a two-roller mill are combined into a drum-shaped corrugated roller and a common flat roller, and the drum-shaped corrugated roller and a drum-shaped flat roller, and the upper roller and the lower roller are drum-shaped corrugated rollers.
4. The method of claim 3, wherein the assembled form of the slab is asymmetric, the crowned corrugated roll is on the magnesium alloy sheet side, and the plain or flat crowned roll is on the pure aluminum or aluminum alloy sheet side; when the assembly form of the plate blank is a symmetrical form, the upper side and the lower side of the plate blank are both drum-shaped corrugated rollers.
5. The method for rolling the magnesium-aluminum laminated plate by the drum-shaped corrugated roller according to the claim 1, 2, 3 or 4, characterized in that the surface of the metal plate is cleaned by wire brush polishing, shot blasting, sand paper sanding, chemical agent cleaning or electrochemical corrosion during the step 1) blank manufacturing process.
6. The method for corrugating magnesium-aluminum laminated plate with drum shape as claimed in claim 1, 2, 3 or 4, wherein the heating of step 2) is carried out for 0.1h ~ 3h at 200 deg.C ~ 600 deg.C.
7. The method for rolling magnesium-aluminum laminated plates by using the drum-shaped corrugated roll as claimed in claim 1, 2, 3 or 4, wherein in the step 3), the drum-shaped corrugated roll is a drum-shaped corrugated roll with a certain number of periodic patterns engraved on the surface, and the relationship between the drum height H and the roll body length L is as follows: H/L is more than 0 and less than or equal to 0.3.
8. The method for rolling the magnesium-aluminum laminated plate by the drum-shaped corrugated roller as claimed in claim 1, 2, 3 or 4, wherein in the step 3), during the rolling process of the drum-shaped corrugated roller, the plate blank needs to be centered before entering a rolling mill, so that the middle part of the plate blank is aligned with the lowest point G of the drum-shaped corrugated roller.
9. The method for rolling the magnesium-aluminum laminated plate by the drum-shaped corrugated roller according to the claim 1, 2, 3 or 4, wherein in the step 5) of the flat rolling process, the thickness H1 of the middle part of the plate, the thickness H2 of the edge part of the plate after the drum-shaped corrugated rolling of the first pass, the flat rolling thickness H3 of the second pass, the original thickness H1 of the magnesium plate and the thickness H2 of the aluminum plate satisfy the following conditions: 0 < 1-H1/(H1+ H2) < 0.5, 0 < (H2-H3)/H2 < 0.6.
10. The method for corrugating a magnesium-aluminum laminated sheet according to claim 1, 2, 3 or 4, wherein the annealing temperature in the annealing process of step 6) is 300 ℃ ~ 500 ℃, the annealing time is 20min ~ 60min, and air cooling is performed after the annealing is finished.
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