CN110252806B - Rolling method for improving bonding strength of bimetal composite plate - Google Patents
Rolling method for improving bonding strength of bimetal composite plate Download PDFInfo
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- CN110252806B CN110252806B CN201910392067.7A CN201910392067A CN110252806B CN 110252806 B CN110252806 B CN 110252806B CN 201910392067 A CN201910392067 A CN 201910392067A CN 110252806 B CN110252806 B CN 110252806B
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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
- 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
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
- B21D13/04—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by 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
- B21B2001/386—Plates
Abstract
The invention relates to the technical field of bimetal composite plate preparation, in particular to a rolling method for improving the bonding strength of a bimetal composite plate, and aims to solve the technical problem that the bimetal composite plate prepared by the existing rolling method is low in bonding strength. The following technical scheme is adopted: and performing wave-flat rolling on the base plate and the clad plate from two vertical directions, and then performing flat rolling. Compared with the traditional rolling method, after the bimetal plates of two different types are subjected to the action of local strong and uneven deformation for three times, the cracking of an oxide layer at a bonding interface and the extrusion of fresh and activated metal atoms can be greatly promoted, so that the two metal atoms have higher diffusion probability, the metallurgical bonding between the two metals in a larger range is realized, and the bonding strength of the two metals is effectively improved.
Description
Technical Field
The invention relates to the technical field of bimetal composite board preparation, in particular to a rolling method for improving the bonding strength of a bimetal composite board.
Background
The bimetal composite board is a novel composite board prepared by firmly combining two metal boards with different physical, chemical and mechanical properties at an interface by a specific manufacturing method. The composite plate can integrate excellent performances of high strength, high toughness, wear resistance, corrosion resistance and the like of the component metal material, and meanwhile, the bimetal composite plate can save precious metal materials and reduce the product cost. The existing manufacturing methods of the bimetal composite plate include an explosion cladding method, a diffusion cladding method, a hot/cold rolling cladding method and the like. The explosion cladding method and the diffusion cladding method generally have the defects of low interface bonding rate, nonuniform bonding, environmental pollution and the like, and compared with the hot/cold rolling cladding method, the hot/cold rolling cladding method has the advantages of high production efficiency, high dimensional precision, stable performance, low pollution, low energy consumption and the like, and is rapidly developed and has huge potential. However, due to the difference in properties between the two different metals, the bimetal composite plate manufactured by the existing rolling method still has the problems of low bonding strength, easy warping, low yield and the like.
Disclosure of Invention
The invention aims to solve the technical problem that the bimetal composite plate manufactured by the existing rolling method is low in bonding strength. Therefore, the invention provides a rolling method for improving the bonding strength of a bimetal composite plate.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a rolling method for improving the bonding strength of a bimetal composite plate comprises the following steps:
s1, blank making: selecting a metal plate with relatively small deformation resistance as a base plate, selecting a metal plate with relatively large deformation resistance as a composite plate (the relatively small deformation resistance and the relatively large deformation resistance are obtained by comparing the deformation resistance of the base plate with that of the composite plate), wherein the thickness ratio of the base plate to the composite plate is 1-10, stacking the composite plate right above the base plate, pressing tightly and fixedly connecting edges (ensuring that the base plate and the composite plate are not dislocated or deviated when subjected to non-uniform tangential force in a rolling process), and obtaining a bimetal composite plate blank;
s2, one-pass flat rolling: when a cold rolling method is adopted, the bimetal composite plate blank obtained in the step S1 is directly sent into a corrugated rolling mill for rolling, when a hot rolling/warm rolling method is adopted, the bimetal composite plate blank obtained in the step S1 is sent into a heating furnace to be heated to a specified temperature and then sent into the corrugated rolling mill for rolling, an upper roller of the corrugated rolling mill adopts a corrugated roller (namely the roller surface is corrugated), a lower roller of the corrugated rolling mill adopts a flat roller, the wave amplitude of a roller shape curve of the corrugated roller is greater than or equal to the thickness value of a composite plate, and the bimetal composite plate I with the upper surface, the bonding interface being corrugated and the lower surface being flat is obtained through processing in the step;
s3, rotation: horizontally rotating the bimetallic composite plate I obtained in the step S2 for 90 degrees;
s4, two-pass flat rolling: when a cold rolling method is adopted, the bimetal composite plate I rotated in the step S3 is directly sent into a corrugated rolling mill for rolling, when a hot rolling/warm rolling method is adopted, the bimetal composite plate I rotated in the step S3 is sent into a heating furnace to be heated to a specified temperature and then sent into the corrugated rolling mill for rolling, the upper roller of the corrugated rolling mill adopts a corrugated roller, the lower roller of the corrugated rolling mill adopts a flat roller, the wave amplitude of the roll shape curve of the corrugated roller is greater than or equal to the thickness value of the composite plate, and the bimetal composite plate II with the upper surface and the bonding interface being cross corrugated surfaces and the lower surface being a plane is obtained through processing in the step;
s5, flat rolling: when a cold rolling method is adopted, the bimetal composite plate II obtained in the step S4 is directly sent into a flat rolling mill for rolling (namely, the upper roll and the lower roll both adopt flat rolls), and when a hot rolling/warm rolling method is adopted, the bimetal composite plate II obtained in the step S4 is sent into a heating furnace for heating to a specified temperature and then sent into the flat rolling mill for rolling, and the bimetal composite plate III with the upper surface and the lower surface as planes and the bonding interface as a cross corrugated surface is obtained by processing in the step;
s6, annealing (namely adopting an annealing means common in the field, namely heating and cooling);
s7, finishing: and (5) straightening, cutting edges and preparing a finished product.
The invention has the beneficial effects that:
1) the invention provides a rolling method for improving the bonding strength of a bimetal composite plate. One pass of the wave-flattening rolling can form a unidirectional corrugated bonding interface between the bimetallic plates, the two pass of the wave-flattening rolling can form a net-shaped corrugated bonding interface between the bimetallic plates, and the final wave-flattening rolling can form a complex net-shaped corrugated bonding interface between the bimetallic plates. Compared with the traditional rolling method, after the bimetal plates of two different types are subjected to the action of local strong and uneven deformation for three times, the cracking of an oxide layer at a bonding interface and the extrusion of fresh and activated metal atoms can be greatly promoted, so that the two metal atoms have higher diffusion probability, the metallurgical bonding between the two metals in a larger range is realized, and the bonding strength of the two metals is effectively improved.
2) When the traditional flat rolling or unidirectional wave flat rolling is adopted, the bonding interface between two metals is a plane or a unidirectional corrugated curved surface, and the interlaminar shear strength of the composite plate obtained by rolling is lower or has the advantage of unidirectional strength.
3) The rolling method has the advantages that the rolling is performed in the two mutually perpendicular directions in the traveling wave flat rolling mode, the extension and the compounding of the bimetal composite plate in multiple directions can be promoted, the rolled area combination rate of the composite plate can be improved compared with the traditional rolling method, the bimetal composite plate with better comprehensive mechanical properties in all directions can be manufactured, and the method has more advantages in the aspect of expanding the application occasions of the composite plate.
4) The wave flat rolling in the two-pass vertical direction can force the residual stress in the rolled bimetal composite plate to be redistributed, and the readjustment of the stress strain state can play a role in regulating and controlling the serious problem of plate shape warping.
Drawings
FIG. 1 is a schematic view of a bi-metallic composite slab;
FIG. 2 is a process flow diagram of a cold-rolled bi-metal composite panel according to the present invention;
FIG. 3 is a flow chart of the warm rolling process for bimetallic clad plates involved in the present invention;
FIG. 4 is a schematic view of a bimetallic composite panel I;
FIG. 5 is a schematic view of bimetallic composite plate II;
FIG. 6 is a schematic view of a bimetallic composite plate III;
in the figure, 1-substrate; 2-doubling plate; 3-bimetal composite board blank; 4-a corrugating roll; 5-flat roll; 6, heating a furnace; 7-a bimetallic composite board I; 8-bimetal composite board II; 9-bimetal composite board III.
Detailed Description
The first embodiment is as follows:
referring to fig. 1, 2, 4-6, a cold rolling method for preparing a Cu/Al bimetal composite plate comprises the following steps:
s1, blank making: selecting a pure Al plate as a base plate 1, wherein the length, the width and the height are respectively 50 mm, 50 mm and 3mm, selecting a pure Cu plate as a composite plate 2, wherein the length, the width and the height are respectively 50 mm, 50 mm and 1mm, the deformation resistance of the Al plate is smaller, the deformation resistance of the Cu plate is larger, the thickness ratio of the base plate 1 to the composite plate 2 is 3, stacking the composite plate 2 right above the base plate 1, symmetrically drilling two holes at a position 15mm away from the rolling biting end in the width direction of the rolling biting end of the composite plate and riveting the two holes through rivets, so that all component plates of the bimetal composite plate blank 3 can be synchronously bitten into a roller, bundling the other end by using bundling lines, and ensuring that the base plate 1 and the composite plate 2 are not deviated at the tail part in the rolling process to obtain the bimetal composite plate. In this embodiment, the ratio of the thicknesses of the substrate 1 and the clad plate 2 is 3, and in other embodiments, the ratio of the thicknesses may be 1, 5, 7, or 10. In the embodiment, the edges are fixedly connected by riveting at the occlusion ends and binding at the opposite ends, and in other embodiments, riveting, bonding, binding or other common fixing means can be combined randomly.
S2, one-pass flat rolling: and (3) sending the bimetal composite plate blank 3 obtained in the step (S1) into a corrugated rolling mill for rolling, wherein an upper roller of the corrugated rolling mill adopts a corrugated roller 4, a lower roller of the corrugated rolling mill adopts a flat roller 5, the amplitude value of a roll shape curve of the corrugated roller 4 is 1mm, the reduction rate is selected to be 35%, the bonding rate of the rolled area is ensured to be more than or equal to 80%, the warping degree is less than or equal to 15%, and the bimetal composite plate I7 with the upper surface and the bonding interface being corrugated surfaces and the lower surface being a plane is obtained by processing in the. Here, the amplitude of the corrugation roller 4 is selected to be 10mm, which is set by comparing with the thickness of the clad plate 2, for example, 10mm selected in this embodiment is larger than 5mm of the thickness of the clad plate 2, of course, it is possible to select 6mm or 8mm, etc., in other embodiments, it is only necessary that the amplitude of the roll profile of the corrugation roller 4 is larger than or equal to the thickness of the clad plate 2. The reduction rate adopted in the embodiment is 35%, in other embodiments, 20% or 50% or 65% or 80% can be selected, the reduction rate is determined according to parameters such as different metal materials and different rolling amplitudes, the adjustment of the reduction rate is realized by adjusting the roll spacing of a rolling mill, the metal plate is cracked when the reduction rate is too large, the corrugated shape cannot be formed on a joint surface when the reduction rate is too small, and for common metals, the selection range of the reduction rate in the step is 20-80%. The roll back product bonding rate and warp can be achieved by adjusting various parameters of the rolling mill, which can be easily achieved by a person in the art according to calculation or through limited experiments.
S3, rotation: the bimetal composite plate i 7 obtained in step S2 is horizontally rotated by 90 °.
S4, two-pass flat rolling: and (3) feeding the bimetallic composite plate I7 rotated in the step (S3) into a corrugated rolling mill for rolling, wherein an upper roller of the corrugated rolling mill adopts a corrugated roller 4, a lower roller of the corrugated rolling mill adopts a flat roller 5, the roller shape and the wave amplitude of the corrugated roller 4 are equal to those in the step (2), the bonding rate of the rolled area is more than or equal to 90 percent, the warping degree is less than or equal to 10 degrees, and the bimetallic composite plate II 8 with the upper surface and the bonding interface being crossed corrugated surfaces and the lower surface being a plane is obtained by processing in the step. In this embodiment, the waved flat rolling mills used for the two-pass waved flat rolling and the one-pass waved flat rolling are completely the same, that is, the roll shape curve and the wave amplitude of the corrugated roll 4 are both equal, which is a preferable scheme to ensure that the strength of the composite plate in two perpendicular directions is equal, and in other embodiments, the corrugated rolls 4 used for the two-pass waved flat rolling may be selected differently.
S5, flat rolling: and (4) feeding the bimetal composite plate II 8 obtained in the step (S4) into a flat rolling mill for rolling, wherein the reduction rate is selected to be 15%, the area bonding rate after rolling is ensured to be more than or equal to 95%, the warping degree is less than or equal to 5%, and the bimetal composite plate III 9 with the upper surface and the lower surface being planes and the bonding interface being a crossed corrugated surface is obtained through processing in the step. The reduction here is chosen to be 15%, in other embodiments 10% or 30% may be used, for common metals the reduction in this step is chosen to be in the range 10-30%.
S6, annealing: and (3) putting the flat-rolled bimetal composite plate into a protective atmosphere heating furnace 6 for annealing treatment, wherein the annealing temperature is 300 ℃, and the annealing time is 30 min.
S7, finishing: and (5) straightening, cutting edges and preparing a finished product.
Example two:
referring to fig. 1, 3 and 4-6, the warm rolling method for preparing the Mg/Al bimetal composite plate comprises the following steps:
s1, blank making: selecting 5052 aluminum alloy as a base plate 1, wherein the length, the width and the height are respectively 300 mm, 300 mm and 25mm, selecting AZ31 magnesium alloy as a clad plate 2, wherein the length, the width and the height are respectively 300 mm, 300 mm and 5mm, the deformation resistance of the 5052 aluminum alloy plate is smaller, the deformation resistance of the AZ31 magnesium alloy plate is larger, the thickness ratio of the base plate 1 to the clad plate 2 is 5, stacking the clad plate 2 over the base plate 1, symmetrically drilling two holes at a position with a distance of 200mm in the width direction of a rolling biting end of the clad plate and riveting the two holes through rivets, so that all component plates of a bimetal composite plate blank 3 can be synchronously bitten into a roller, and bundling the other end by using bundling wires to ensure that the base plate 1 and the clad plate 2 cannot deviate at the tail part in the rolling process, and the bimetal composite plate blank 3 is obtained. In this embodiment, the ratio of the thicknesses of the substrate 1 and the clad plate 2 is 5, and in other embodiments, the ratio of the thicknesses may be 1, 3, 7, or 10. In this embodiment, the edges are fixed by riveting at the snap ends and binding at the opposite ends, and in other embodiments, the edges can be riveted, bonded, bound or other common fixing means or their combination.
S2, one-pass flat rolling: putting the bimetal composite plate blank 3 obtained in the step S1 into a protective atmosphere heating furnace 6, and keeping the temperature at 400 ℃ for 15 min; and then, sending the double-metal composite plate into a corrugated rolling mill for rolling, wherein an upper roller of the corrugated rolling mill adopts a corrugated roller 4, a lower roller of the corrugated rolling mill adopts a flat roller 5, the amplitude of a roll-shaped curve of the corrugated roller 4 is 10mm, the reduction rate is selected to be 50%, the bonding rate of the rolled area is ensured to be more than or equal to 80%, the warping degree is ensured to be less than or equal to 15%, and the double-metal composite plate I7 with the upper surface and the bonding interface being corrugated surfaces and the lower surface being a plane is. Here, the amplitude of the corrugation roller 4 is selected to be 6mm, which is set by comparing with the thickness of the clad plate 2, for example, the selected 6mm is greater than the thickness 5mm of the clad plate 2 in this embodiment, of course, it is acceptable to select 7mm or 8mm, etc., in other embodiments, it is only necessary that the amplitude of the roll profile of the corrugation roller 4 is greater than or equal to the thickness of the clad plate 2. The rolling reduction rate adopted in the embodiment is 50%, and in other embodiments, 20% or 35% or 65% or 80% can be selected. The roll back product bonding rate and warp can be achieved by adjusting various parameters of the rolling mill, which can be easily achieved by a person in the art according to calculation or through limited experiments.
S3, rotation: the bimetal composite plate i 7 obtained in step S2 is horizontally rotated by 90 °.
S4, two-pass flat rolling: putting the bimetallic composite plate I7 rotated in the step S3 into a protective atmosphere heating furnace 6, and preserving heat for 5min at 400 ℃; and then, feeding the double-metal composite plate into a corrugated rolling mill for rolling, wherein an upper roller of the corrugated rolling mill adopts a corrugated roller 4, a lower roller of the corrugated rolling mill adopts a flat roller 5, the parameter selection is the same as S3, the bonding rate of the rolled area is more than or equal to 90 percent, the warping degree is less than or equal to 10 degrees, and the double-metal composite plate II 8 with the upper surface and the bonding interface which are cross corrugated surfaces and the lower surface which is a plane is obtained by processing in the. In this embodiment, the waved flat rolling mills used for the two-pass waved flat rolling and the one-pass waved flat rolling are completely the same, that is, the roll shape curve and the wave amplitude of the corrugated roll 4 are both equal, which is a preferable scheme to ensure that the strength of the composite plate in two perpendicular directions is equal, and in other embodiments, the corrugated rolls 4 used for the two-pass waved flat rolling may be selected differently.
S5, flat rolling: putting the bimetal composite plate II 8 obtained in the step S4 into a protective atmosphere heating furnace 6, and preserving the heat at 400 ℃ for 5 min; and then, sending the double-metal composite plate into a flat rolling mill for rolling, wherein the reduction rate is selected to be 20%, the bonding rate of the rolled area is more than or equal to 95%, and the warping degree is less than or equal to 5%, and the double-metal composite plate III 9 with the upper surface and the lower surface being planes and the bonding interface being a crossed corrugated surface is obtained by processing in the step. The reduction rate is chosen here to be 20%, but in other embodiments 10% or 30% may also be used.
S6, annealing: and (3) putting the flat-rolled bimetal composite plate into a protective atmosphere heating furnace 6 for annealing treatment, wherein the annealing temperature is 300 ℃, and the annealing time is 30 min.
S7, finishing: and (5) straightening, cutting edges and preparing a finished product.
The roll profile of the corrugating roll 4 in the present invention is sinusoidal or parabolic or triangular or other common wave form.
The following metal composite plates were rolled using the existing flat-rolling cold-rolling method and the one-way wave-flat cold-rolling method as comparative examples one and two, as follows:
comparative example one, a flat-roll cold-rolled Cu/Al bimetallic composite sheet was used, comprising the steps of:
s1, blank making: selecting a pure Al plate as a substrate 1, wherein the length, the width and the height are respectively 50 mm, 50 mm and 3mm, selecting a pure Cu plate as a composite plate 2, wherein the length, the width and the height are respectively 50 mm, 50 mm and 1mm, the thickness ratio of the substrate 1 to the composite plate 2 is 3, stacking the composite plate 2 right above the substrate 1, symmetrically drilling two holes at a distance of 15mm in the width direction of a rolling biting end of the composite plate and riveting the two holes through rivets, bundling the composite plate at the other end by using bundling wires, so as to ensure that the deviation of the substrate 1 and the composite plate 2 at the tail part can not occur in the rolling process, and obtaining the bimetallic plate blank 3 of the composite plate.
S2, one-pass flat rolling: and (5) sending the bimetal composite plate blank 3 obtained in the step (S1) into a flat rolling mill for rolling, wherein the upper and lower rollers of the flat rolling mill adopt flat rollers 4, the reduction rate is selected to be 35%, and the step is used for processing to obtain the primary flat rolling bimetal composite plate.
S3, two-pass flat rolling: and (4) sending the flat-rolled bimetal composite plate obtained in the step (S2) into a flat rolling mill again for rolling, wherein the upper and lower rollers of the flat rolling mill adopt flat rollers 4, the reduction rate is selected to be 15%, and the two-pass flat-rolled bimetal composite plate is obtained by processing in the step and reaches the final size.
S4, annealing: and (3) putting the flat-rolled bimetal composite plate into a protective atmosphere heating furnace 6 for annealing treatment, wherein the annealing temperature is 300 ℃, and the annealing time is 30 min.
S5, finishing: and (5) straightening, cutting edges and preparing a finished product.
And compared with the second comparative example, the one-way corrugated flat cold-rolled Cu/Al bimetal composite plate comprises the following steps:
s1, blank making: selecting a pure Al plate as a substrate 1, wherein the length, the width and the height are respectively 50 mm, 50 mm and 3mm, selecting a pure Cu plate as a composite plate 2, wherein the length, the width and the height are respectively 50 mm, 50 mm and 1mm, the thickness ratio of the substrate 1 to the composite plate 2 is 3, stacking the composite plate 2 right above the substrate 1, symmetrically drilling two holes at a distance of 15mm in the width direction of a rolling biting end of the composite plate and riveting the two holes through rivets, bundling the composite plate at the other end by using bundling wires, so as to ensure that the deviation of the substrate 1 and the composite plate 2 at the tail part can not occur in the rolling process, and obtaining the bimetallic plate blank 3 of the composite plate.
S2, one-pass flat rolling: and (3) sending the bimetal composite plate blank 3 obtained in the step (S1) into a corrugated rolling mill for rolling, wherein an upper roller of the corrugated rolling mill adopts a corrugated roller 4, a lower roller of the corrugated rolling mill adopts a flat roller 5, the wave amplitude value of a roll shape curve of the corrugated roller 4 is 1mm, and the reduction rate is selected to be 35%.
S3, rotation: the bimetal composite plate i 7 obtained in step S2 is horizontally rotated by 90 °.
S4, flat rolling: and (4) sending the bimetallic composite plate I7 obtained in the step (S3) into a flat rolling mill for rolling, wherein the reduction rate is selected to be 15%, and the bimetallic composite plate with the upper surface and the lower surface being planes and the bonding interface being a unidirectional corrugated surface is obtained through processing in the step.
S5, annealing: and (3) putting the flat-rolled bimetal composite plate into a protective atmosphere heating furnace 6 for annealing treatment, wherein the annealing temperature is 300 ℃, and the annealing time is 30 min.
S6, finishing: and (5) straightening, cutting edges and preparing a finished product.
The characteristics and properties of the composite plates rolled in the comparative examples 1 and 2 were observed and measured, and the relevant items and parameters are shown in the following table:
| evaluation item | Example one | Comparative example 1 | Comparative example No. two |
| Warping of sheet material | Light and slight | Severe severity of disease | Is more obvious |
| Pulling and shearing strength (rolling direction) | 82.39MPa | 61.73MPa | 73.64MPa |
| Pulling and shearing strength (horizontal) | 63.24MPa | 48.91MPa | 51.33MPa |
| Peel strength (roll direction) | 29.15N/mm | 25.82N/mm | 27.36N/mm |
| Peel strength (transverse) | 26/74N/mm | 22.39MPa | 20.81N/mm |
| Edge crack phenomenon | Light and slight | Light and slight | Light and slight |
The experimental data in the above table are measured on a DNS200 electronic universal tester, and the test is performed by a controlled variable method, and other selection parameters are the same except for the different rolling methods used in processing, and the results are as follows: compared with the traditional rolling method, after the Cu/Al bimetal composite plate is subjected to three times of local strong and uneven deformation, the problem of plate shape warping is greatly improved, the tensile shear strength and the peeling strength in the rolling direction and the transverse direction are improved to a certain degree, the residual stress in the bimetal composite plate can be greatly reduced by adopting a new rolling process, and edge crack aggravation cannot be caused. The new process provided by the invention is adopted to roll the bimetal composite plate, so that the bonding strength of the two plates can be effectively improved, the warping of the plate can be reduced, the residual stress of the plate can be reduced, and the production efficiency and the yield can be improved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A rolling method for improving the bonding strength of a bimetal composite plate is characterized by comprising the following steps:
s1, blank making: selecting a metal plate with relatively small deformation resistance as a base plate (1), selecting a metal plate with relatively large deformation resistance as a composite plate (2), wherein the thickness ratio of the base plate (1) to the composite plate (2) is 1-10, stacking the composite plate (2) right above the base plate (1), pressing tightly, and fixedly connecting edges to obtain a bimetal composite plate blank (3);
s2, one-pass flat rolling: when a cold rolling method is adopted, the bimetal composite plate blank (3) obtained in the step S1 is directly sent into a corrugated rolling mill for rolling, when a hot rolling/warm rolling method is adopted, the bimetal composite plate blank (3) obtained in the step S1 is sent into a heating furnace (6) to be heated to a specified temperature and then sent into the corrugated rolling mill for rolling, the upper roll of the corrugated rolling mill adopts a corrugated roll (4), the lower roll adopts a flat roll (5), the wave amplitude of the roll shape curve of the corrugated roll (4) is greater than or equal to the thickness value of the composite plate (2), and the bimetal composite plate I (7) with the upper surface and the bonding interface being corrugated surfaces and the lower surface being a plane is obtained through processing in the step;
s3, rotation: horizontally rotating the bimetallic composite plate I (7) obtained in the step S2 for 90 degrees;
s4, two-pass flat rolling: when a cold rolling method is adopted, the bimetal composite plate I (7) rotated in the step S3 is directly sent into a corrugated rolling mill for rolling, when a hot rolling/warm rolling method is adopted, the bimetal composite plate I (7) rotated in the step S3 is sent into a heating furnace (6) to be heated to a specified temperature and then sent into the corrugated rolling mill for rolling, the upper roll of the corrugated rolling mill adopts a corrugated roll (4), the lower roll adopts a flat roll (5), the wave amplitude value of the roll-shaped curve of the corrugated roll (4) is greater than or equal to the thickness value of the composite plate (2), and the bimetal composite plate II (8) with the upper surface and the bonding interface being a crossed corrugated surface and the lower surface being a plane is obtained through processing in the step;
s5, flat rolling: when a cold rolling method is adopted, the bimetal composite plate II (8) obtained in the step S4 is directly sent into a flat rolling mill for rolling, when a hot rolling/warm rolling method is adopted, the bimetal composite plate II (8) obtained in the step S4 is sent into a heating furnace (6) for heating to a specified temperature and then sent into the flat rolling mill for rolling, and the bimetal composite plate III (9) with the upper surface and the lower surface being planes and the bonding interface being a cross corrugated surface is obtained through processing in the step;
s6, annealing;
s7, finishing: and (5) straightening, cutting edges and preparing a finished product.
2. The rolling method for improving the bonding strength of a bimetal composite plate according to claim 1, wherein the rolling method comprises the following steps: in step S1, the edge is secured by riveting or wire bonding or adhesive means.
3. The rolling method for improving the bonding strength of a bimetal composite plate according to claim 1, wherein the rolling method comprises the following steps: the roll shape curve shapes of the corrugating rolls (4) in the steps S4 and S2 are the same and the wave amplitudes are the same.
4. The rolling method for improving the bonding strength of a bimetal composite plate according to claim 3, wherein the rolling method comprises the following steps: in step S2, the draft is selected within the range of 20-80%, the area-bonding ratio after rolling is guaranteed to be more than or equal to 80%, and the warping degree is less than or equal to 15 °.
5. The rolling method for improving the bonding strength of a bimetal composite plate according to claim 4, wherein the rolling method comprises the following steps: in step S4, the rolling reduction is the same as that of step S2, so that the rolling area bonding rate after rolling is more than or equal to 90 percent, and the warping degree is less than or equal to 10 degrees.
6. The rolling method for improving the bonding strength of a bimetal composite plate according to claim 5, wherein the rolling method comprises the following steps: in step S5, the draft is selected within the range of 10% -30%, the area-bonding ratio after rolling is guaranteed to be more than or equal to 95%, and the warping degree is less than or equal to 5 °.
7. The rolling method for improving the bonding strength of a bimetal composite plate according to any one of claims 1 to 6, wherein: the roll shape curve of the corrugated roll (4) is a sine curve or a parabola or a triangle.
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| CN110614275B (en) * | 2019-11-12 | 2020-12-04 | 太原理工大学 | Method for rolling bimetal composite plate in strong deformation manner |
| CN112496076B (en) * | 2020-10-30 | 2022-08-12 | 太原理工大学 | Rolling method of inner corrugated metal composite pipe |
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| CN113020264A (en) * | 2021-03-25 | 2021-06-25 | 太原理工大学 | Metal composite plate rolling method for forming interweaving combination interface |
| CN113020261B (en) * | 2021-03-25 | 2022-11-08 | 太原理工大学 | Rolling method of metal composite plate with prefabricated corrugated interface |
| CN113020262B (en) * | 2021-03-25 | 2022-11-08 | 太原理工大学 | Metal composite plate rolling method for prefabricating cross corrugated interface |
| CN114192580A (en) * | 2021-12-16 | 2022-03-18 | 安徽工业大学 | Preparation method of cross corrugated interface metal composite plate |
| CN115026129A (en) * | 2022-08-10 | 2022-09-09 | 太原科技大学 | Method for preparing magnesium/titanium layered waveform interface composite material based on rolling method |
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