Rolling method and rolling system of corrugated roller

Abstract

The invention discloses a rolling method of a corrugated roller and a rolling system of the corrugated roller, relates to the field of bimetal laminated plate preparation, and aims to solve the problem that a metal laminated plate is easy to crack in the machining process. The rolling method comprises the steps that a plate blank is fed into two corrugated rollers arranged at an interval to be rolled, so that a first double-metal laminated plate is formed, and the upper surface and the lower surface of the first double-metal laminated plate and the bonding interface of the plate blank are all latticed wavy surfaces; the first double-metal laminated plate is fed into two flat rollers arranged at an interval to be rolled, so that a second double-metal laminated plate is formed, the upper surface and the lower surface of the second double-metal laminated plate are both planes, and the bonding interface is a latticed wavy surface; and carrying out annealing treatment on the second bimetal laminated plate. The corrugated structure on the corrugated roller is reflected to the bonding interface between the base plate and the compound plate, and then secondary rolling is performed through the flat roller, so that the bonding strength of the second double-metal laminated plate is improved, and the forming quality and the yield of the metal laminated plate are guaranteed.

Description

Technical Field

[0001] The invention relates to the field of preparation of bimetallic laminates, and in particular to a rolling method of a corrugated roller and a rolling system thereof. Background Art

[0002] Metal laminate is a composite material formed by superimposing two or more metal materials through specific composite technology. In order to ensure the metallurgical bonding formed by the interface layer in the metal laminate, it has good strength and connectivity and prevents interlayer peeling and delamination. In the traditional flat rolling process, the metal mainly plastically extends along the rolling direction. Therefore, one crystal plane of each grain is parallel to the rolling plane, and one direction is parallel to the rolling direction, forming a rolling texture. As a result, in the subsequent forming process of the laminate, the tensile properties in different directions are significantly different. In the stamping process, the metal laminate is prone to defects such as cracking, cracks or earing. Summary of the invention

[0003] The object of the present invention is to provide a rolling method and a rolling system of a corrugated roller, which are used to reduce the warping risk of metal laminates and improve the forming quality and yield rate of metal laminates.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides a rolling method for a corrugated roller, the method comprising the following steps:

[0006] S100, blank making: stacking the composite plates on the top of the base plate and pressing them tightly to obtain a bimetallic laminate blank;

[0007] S200, one-pass rolling: feeding the bimetallic laminate slab into two spaced-apart corrugated rollers for rolling to form a first bimetallic laminate, so that the upper surface of the first bimetallic laminate, the lower surface of the first bimetallic laminate, and the bonding interface between the composite plate and the substrate are all grid-like wave surfaces, the corrugated roller has a corrugated structure, and the corrugated structure is formed by selecting a certain closed shape as a cross-section and sweeping a plurality of left spiral lines and a plurality of right spiral lines as guide lines on the roller surface of the corrugated roller, and the left spiral lines and the right spiral lines are interlaced and distributed;

[0008] S300, second-pass rolling: feeding the first bimetallic laminate into two spaced-apart flat rollers for rolling to form a second bimetallic laminate, so that the upper surface and the lower surface of the second bimetallic laminate are both planes and the bonding interface is a grid-like wavy surface;

[0009] S400, annealing: performing annealing treatment on the second bimetallic laminate.

[0010] Optionally, in the rolling method of the corrugated roller, both the right helix and the left helix are cylindrical helices, and the parameter equation of the right helix is:

[0011]

[0012] Among them, R is the radius of the roller surface where the cylindrical helix is ​​located, P is the lead of the cylindrical helix, b is the pitch of the cylindrical helix, T is the period of the cylindrical helix, n1 is the number of heads of the right helix, β1 is the helical angle between the right helix and the axis of the corrugated roller,

[0013] The parametric equation of the left helix is:

[0014]

[0015] Among them, R is the radius of the roller surface where the cylindrical helix is ​​located, P is the lead of the cylindrical helix, b is the pitch of the cylindrical helix, T is the period of the cylindrical helix, n2 is the number of heads of the left helix, β2 is the helical angle between the left helix and the axis of the corrugated roller,

[0016] And the left helix and the right helix satisfy the following conditions:

[0017] θ1=θ2;

[0018]

[0019] Optionally, in the rolling method of the corrugated roller, the cross-sectional profile of the closed shape includes a sawtooth shape or a wave shape;

[0020] Optionally, in the rolling method of the corrugated roller, the angle formed by two sides of each unit tooth shape on the cross-sectional profile is greater than or equal to 60°.

[0021] And / or, the distance between the peak point and the valley point of the cross-sectional profile in the radial direction of the corrugation roller is 3 mm to 5 mm.

[0022] Optionally, in the above-mentioned rolling method using a corrugated roller, in one rolling pass, the reduction rate of the corrugated roller rolling is 20% to 70%.

[0023] And / or, in the second-pass rolling, the reduction ratio of the flat roll rolling is 10% to 40%.

[0024] Optionally, in the rolling method of the corrugated roller, before the first bimetallic laminate is fed into two spaced-apart flat rollers for rolling, the rolling method further comprises: using a hot rolling process, placing the bimetallic laminate slab into a protective atmosphere heating furnace for heating, the heating temperature is 350° C. to 450° C., and the holding time is 12 min to 18 min;

[0025] And / or, before feeding the first bimetallic laminate into two spaced-apart flat rollers for rolling, the rolling method further comprises: using a hot rolling process to heat the first bimetallic laminate in a protective atmosphere heating furnace at a heating temperature of 350°C to 450°C and a holding time of 4min to 8min.

[0026] Optionally, in the rolling method of the corrugated roller, annealing the second bimetallic laminate comprises: placing the second bimetallic laminate in a protective atmosphere heating furnace for annealing, the annealing temperature is 280° C. to 350° C., and the annealing time is 25 min to 35 min.

[0027] Optionally, in the rolling method of the corrugated roller, after the second bimetallic laminate is annealed, the rolling method further comprises:

[0028] S500, finishing: straightening and trimming to produce the finished product.

[0029] Compared with the prior art, when the above technical scheme is adopted, the substrate and the composite plate are first stacked and pressed to form a bimetallic laminate slab, so that the substrate and the composite plate will not be dislocated or deviated when subjected to non-uniform tangential force during the rolling process; then, a corrugated roller is used for one-pass rolling, and the bimetallic laminate slab is fed into two corrugated rollers arranged at intervals for rolling to form a first bimetallic laminate. The corrugated structure of the corrugated roller causes the upper surface of the first bimetallic laminate, the lower surface of the first bimetallic laminate, and the bonding interface between the composite plate and the substrate to produce strong plastic extrusion into a grid-like wavy surface, thereby changing the flow direction of the composite plate material and the substrate material during rolling, so as to destroy the deformation texture caused by rolling, weaken the anisotropy of the upper and lower parts of the first bimetallic laminate, and improve the bonding strength of the slab; then, a flat roller is used to roll the first bimetallic laminate for a second pass, during which the corresponding first bimetallic laminate is rolled. The grid-like wavy surfaces on the upper and lower surfaces of the metal laminate produce secondary strong deformation, so that the upper and lower surfaces of the first bimetallic laminate are pressed into planes. At the same time, the metal near the bonding interface is also strongly deformed due to the extrusion of the two flat rollers. Since the bonding interface is a grid-like wavy surface, the risk of warping and cracking during rolling is avoided, and the bonding strength between the two-layer structure of the second bimetallic laminate is improved; the second bimetallic laminate that has been rolled is annealed to refine the grains of the second bimetallic laminate and improve its organizational structure to improve the plasticity and toughness of the second bimetallic laminate. Compared with the traditional method of using flat rollers for multiple rolling, the present application improves the bonding strength of the second bimetallic laminate by projecting the corrugated structure on the corrugated roller to the bonding interface between the substrate and the composite plate, and then performing secondary rolling with flat rollers to ensure the forming quality and yield rate of the metal laminate.

[0030] In the second aspect, the present invention also provides a rolling system, which is suitable for any of the above-mentioned corrugated roller rolling methods, comprising two driving devices, a flat roller group and a corrugated roller group, the flat roller group is composed of two flat rollers set at an interval, and the corrugated roller group is composed of two corrugated rollers set at an interval, the two driving devices are used to drive the rotation of the flat roller group and the rotation of the corrugated roller group respectively, the corrugated roller group is used to roll the bimetallic laminate slab to form a first bimetallic laminate, and the flat roller group is used to roll the first bimetallic laminate to form a second bimetallic laminate.

[0031] Optionally, in the above rolling system, the thickness ratio of the base plate to the duplicate plate is less than or equal to 3, and the two corrugating rollers have the same structural parameters;

[0032] Alternatively, the thickness ratio of the base plate to the double plate is greater than 3, and the two corrugating rollers have different structural parameters.

[0033] Compared with the prior art, the rolling system provided by the present invention is suitable for the corrugated roller in the above technical solution to perform rolling work, and its beneficial effects are the same as the beneficial effects of the rolling method of the corrugated roller in the above technical solution, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0035] Figure 1 A process flow chart of a rolling method of a corrugated roller provided in an embodiment of the present invention;

[0036] Figure 2 A schematic structural diagram of a bimetallic laminate slab in step S100 of a corrugation roller rolling method provided in an embodiment of the present invention;

[0037] Figure 3 It is a structural schematic diagram of the first rolling in step S200 of a rolling method of a corrugated roller provided in an embodiment of the present invention;

[0038] Figure 4 for Figure 3 A schematic structural diagram of a first bimetallic laminate formed after rolling is completed;

[0039] Figure 5 It is a structural schematic diagram of secondary rolling in step S300 of a rolling method of a corrugated roller provided in an embodiment of the present invention;

[0040] Figure 6 for Figure 5 A schematic diagram of the structure of the second bimetallic laminate formed after the rolling is completed;

[0041] Figure 7 A schematic structural diagram of a corrugated roller in a corrugated roller rolling method provided in an embodiment of the present invention;

[0042] Figure 8 for Figure 7 Radial section of the middle corrugation roller;

[0043] Fig. 9 for Figure 7 AA section view in.

[0044] Reference numerals:

[0045] 1-bimetallic laminate blank; 11-substrate; 12-composite plate; 13-bonding interface; 2-corrugated roller; 21-left helix; 22-right helix; 23-cross-sectional profile; 3-first bimetallic laminate; 31-grid-like wavy surface; 4-flat roller; 5-second bimetallic laminate. DETAILED DESCRIPTION

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0048] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0049] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] like Figure 1-Figure 9 As shown, an embodiment of the present invention provides a rolling method for a corrugated roller 2, the method comprising the following steps:

[0052] S100, blank making: stacking the composite plate 12 on the top of the base plate 11 and pressing it tightly to obtain a bimetallic laminate blank 1;

[0053] S200, one-pass rolling: feeding the bimetallic laminate slab 1 into two spaced-apart corrugated rollers 2 for rolling to form a first bimetallic laminate 3, so that the upper surface of the first bimetallic laminate 3, the lower surface of the first bimetallic laminate 3, and the bonding interface 13 between the composite plate 12 and the substrate 11 are all grid-like wave surfaces 31, and the corrugated roller 2 has a corrugated structure, which is formed by selecting a certain closed shape as a cross-section and sweeping a plurality of left spiral lines 21 and a plurality of right spiral lines 22 as guide lines on the roller surface of the corrugated roller 2;

[0054] S300, second rolling: feeding the first bimetallic laminate 3 into two spaced-apart flat rollers 4 for rolling to form a second bimetallic laminate 5, so that the upper surface and the lower surface of the second bimetallic laminate 5 are both planes and the bonding interface 13 is a grid-like wavy surface 31;

[0055] S400, annealing: performing annealing treatment on the second bimetallic laminate 5.

[0056] When implementing it, Figure 1As shown, the substrate 11 and the composite plate 12 are first stacked and pressed to form a bimetallic laminate slab 1, so that the substrate 11 and the composite plate 12 will not be dislocated or deviated when subjected to non-uniform tangential force during the rolling process; then the corrugated roller 2 is used for one-pass rolling, and the bimetallic laminate slab 1 is fed into two spaced corrugated rollers 2 for rolling to form a first bimetallic laminate 3. The corrugated structure of the corrugated roller 2 causes the upper surface of the first bimetallic laminate 3, the lower surface of the first bimetallic laminate 3, and the bonding interface 13 between the composite plate 12 and the substrate 11 to produce strong plastic extrusion into a grid-like wavy surface 31, which changes the flow direction of the composite plate 12 material and the substrate 11 material during rolling, so as to destroy the deformation texture caused by rolling, weaken the anisotropy of the upper and lower parts of the first bimetallic laminate 3, and improve the bonding strength of the slab; then the flat roller 4 is used to roll the first bimetallic laminate 3 for two passes, during which the corresponding first bimetallic laminate 3 is The grid-like wavy surface 31 on the upper and lower surfaces produces secondary strong deformation, so that the upper and lower surfaces of the first bimetallic laminate 3 are pressed into planes. At the same time, the metal near the bonding interface 13 is also strongly deformed due to the extrusion of the two flat rollers 4. Since the bonding interface 13 is a grid-like wavy surface 31, the risk of warping and cracking during rolling is avoided, and the bonding strength between the two-layer structure of the second bimetallic laminate 5 is improved; the rolled second bimetallic laminate 5 is annealed to refine the grains of the second bimetallic laminate 5 and improve its organizational structure to improve the plasticity and toughness of the second bimetallic laminate 5. Compared with the traditional method of using flat rollers 4 for multiple rolling, the present application improves the bonding strength of the second bimetallic laminate 5 by projecting the corrugated structure on the corrugated roller 2 to the bonding interface 13 between the substrate 11 and the composite plate 12, and then performing secondary rolling through the flat roller 4, so as to ensure the forming quality and yield rate of the second metal laminate.

[0057] Specifically, in this embodiment, before stacking the composite plate 12 on the top of the base plate 11 and pressing in step S100, the rolling method further includes: grinding the surfaces of the composite plate 12 and the base plate 11 to be composited. The oxide layer and oil stains on the surfaces of the composite plate 12 and the base plate 11 are removed by grinding, so as to improve the bonding strength of the composite plate 12 and the base plate 11 after being stacked and pressed, and ensure the forming quality and yield rate of the second bimetallic laminate 5.

[0058] Specifically, in this embodiment, the base plate 11 and the composite plate 12 are connected at the edges by riveting. The base plate 11 and the composite plate 12 may also be connected by bonding, bundling or other commonly used connection methods, which are not specifically limited here, for easy installation and disassembly.

[0059] like Figure 3 and Figure 7As shown, specifically, in this embodiment, the right helix 22 and the left helix 21 are both cylindrical helices, and the parameter equation of the right helix 22 is:

[0060]

[0061] Among them, R is the radius of the roller surface where the cylindrical helix is ​​located, P is the lead of the cylindrical helix, b is the pitch of the cylindrical helix, T is the period of the cylindrical helix, n1 is the number of heads of the right helix 22, β1 is the helical angle between the right helix 22 and the axis of the corrugation roller 2,

[0062] The parametric equation of the left helix 21 is:

[0063]

[0064] Among them, R is the radius of the roller surface where the cylindrical helix is ​​located, P is the lead of the cylindrical helix, b is the pitch of the cylindrical helix, T is the period of the cylindrical helix, n2 is the number of heads of the left helix 21, β2 is the helical angle between the left helix 21 and the axis of the corrugated roller 2,

[0065] And the left helix 21 and the right helix 22 satisfy the following conditions:

[0066] θ1=θ2;

[0067] It should be noted that the distribution of the left helix 21 and the right helix 22 on the roller surface in the present application are partial curves of the cylindrical helix. Therefore, the radius R of the roller surface where the cylindrical helix is ​​located, the lead P of the cylindrical helix, the pitch b of the cylindrical helix, the period T of the cylindrical helix, the number of heads n1 of the right helix 22, the number of heads n2 of the left helix 21, the helix angle β1, the helix angle β2 and the amplitude A are not marked in the figure.

[0068] like Figure 1As shown, after determining the number of heads n, pitch b, lead P, helical angle β and other parameters of the left-handed helical line 21 and the right-handed helical line 22 by the above cylindrical helical formula, the operator can select a closed shape as a cross section and use one of the left-handed helical lines as a guide line to sweep around the roller surface, repeating the sweep of n2 left-handed helical lines 21 for many times, and then use the selected cross section to use one of the right-handed helical lines as a guide line to sweep around the roller surface for many times, and then use the selected cross section to use one of the right-handed helical lines as a guide line to sweep around the roller surface for many times, and then complete the sweep of n1 right-handed helical lines 22 to form a corrugated structure. A plurality of unit bumps are formed on the surface at the intersection of the left spiral line 21 and the right spiral line 22, and the plurality of unit bumps are arranged in an array along the left spiral line 21 and the right spiral line 22 in sequence. The unit bumps generate an oblique cross flow with the surface of the bimetallic laminate slab 1 during a single rolling process, which promotes the lateral and oblique extension of the metal, destroys the specific rolling grain orientation on the bimetallic laminate slab 1, weakens the rolling texture, reduces the anisotropy of mechanical properties, and improves the bonding strength between the composite plate 12 and the substrate 11 when rolling the bimetallic laminate slab 1.

[0069] like Figure 8 and Fig. 9 As shown, specifically, in this embodiment, the closed cross-sectional profile 23 includes a sawtooth shape or a wavy shape. That is, the cross-sectional profile 23 of the selected cross section during sweeping can be sawtooth or wavy. When the cross-sectional profile 23 is sawtooth, the closed figure of the selected cross section is a triangle; when the cross-sectional profile 23 is wavy, the closed figure of the selected cross section can be a hemisphere, an ellipsoid or other shapes with a smooth surface contour, which is not specifically limited here. The wavy contour trajectory can be formed by splicing a sine curve, a cosine curve or multiple parabolas, as long as the corner gap of the corrugated structure surface is relatively smoothly transitioned, the concentrated stress generated at the corner gap of the corrugated structure surface during rolling is reduced, and the risk of warping and edge cracking of the rolled metal laminate is avoided.

[0070] like Fig. 9 As shown, specifically, in this embodiment, the angle formed by the two sides of each unit tooth shape on the cross-sectional profile 23 is greater than or equal to 60°. The angle formed by the two sides of each unit tooth shape on the cross-sectional profile 23 is greater than or equal to 60°. Among them, the angle α formed by the two sides of each unit tooth shape on the profile can be 60°, 80°, 95°, 130°, etc., and the angle α formed by the two sides of each unit tooth shape is not specifically limited here, as long as the corner gap of the corrugated structure surface is relatively smoothly transitioned, the concentrated stress generated at the corner gap of the corrugated structure surface during rolling is reduced, and the risk of warping and edge cracking of the rolled bimetallic layer plate blank is avoided.

[0071] like Figure 8As shown, specifically, in this embodiment, the distance between the peak point and the valley point of the cross-sectional profile 23 in the radial direction of the corrugation roller 2 is 3mm to 5mm. Among them, the distance h between the peak point and the valley point of the cross-sectional profile 23 in the radial direction of the corrugation roller 2 can be 3mm, 3.5mm, 4mm, 5mm, etc., and the distance h between the peak point and the valley point of the cross-sectional profile 23 in the radial direction of the corrugation roller 2 is not specifically limited here, as long as the transition of the corrugated structure surface at the peak point and the valley point is relatively smooth, the concentrated stress generated on the surface of the corrugated structure during rolling is avoided, and the risk of warping and edge cracking during rolling of the bimetallic layer plate blank is reduced.

[0072] Specifically, in this embodiment, in one rolling pass, the rolling reduction rate of the corrugated roller 2 is 20% to 70%; and / or, in the second rolling pass, the rolling reduction rate of the flat roller 4 is 10% to 40%. The reduction rates of the two corrugated rollers 2 when working can be 20%, 45%, 50%, 70%, etc., and the reduction rates of the two flat rollers 4 when working can be 10%, 15%, 30%, 40%, etc., and the reduction rates of the corrugated rollers 2 and the flat rollers 4 are not specifically limited, as long as the second bimetallic laminate 5 formed by rolling has good bonding strength.

[0073] It should be noted that the reduction rate is adjusted by adjusting the roller spacing of the corrugated roller 2 or the roller spacing of the flat roller 4, and the magnitude of the reduction rate is determined according to different metal materials, different rolling amplitudes and other parameters. If the reduction rate is too large, it is easy to cause cracking of the bimetallic laminated sheet blank, and if the reduction rate is too small, it is impossible to form a grid-like wavy surface 31 at the bonding interface 13 between the substrate 11 and the composite plate 12, resulting in poor bonding strength of the bimetallic laminated sheet blank. At the same time, the selection of parameters such as the roller spacing of the corrugated roller 2, the roller spacing of the flat roller 4, and the amplitude A of the corrugated roller 2 are all adaptively adjusted according to the reduction rate, the material of the bimetallic laminated sheet blank 1, etc., as long as the bonding interface 13 of the first bimetallic laminate 3 or the second bimetallic laminate 5 obtained by processing is a grid-like wavy surface 31.

[0074] Specifically, in this embodiment, before the first bimetallic laminate 3 is fed into two spaced flat rollers 4 for rolling in step S300, the rolling method further includes: using a hot rolling process, placing the bimetallic laminate slab 1 in a protective atmosphere heating furnace for heating, the heating temperature is 350°C to 450°C, and the insulation time is 12min to 18min. Among them, the heating temperature can be 350°C, 360°C, 400°C, 415°C, 430°C, 450°C, etc., and the insulation time can be 12min, 13min, 15min, 16min, 18min, etc., and the heating temperature and insulation time are not specifically limited here, as long as the rolling of the bimetallic laminate slab 1 meets the processing requirements. Preferably, when rolling with the corrugated roller 2, the heating temperature is 400°C and the heat preservation time is 15 minutes. The hot rolling process makes the metal have high plasticity and low deformation resistance. At the same time, the corrugated structure of the corrugated roller 2 is more easily reflected on the bonding interface 13 to form a grid-like wave surface 31, thereby improving the rolling processing efficiency.

[0075] Specifically, in this embodiment, before the first bimetallic laminate 3 is fed into two spaced flat rollers 4 for rolling, the rolling method further includes: using a hot rolling process, placing the first bimetallic laminate 3 in a protective atmosphere heating furnace for heating, the heating temperature is 350°C to 450°C, and the insulation time is 4min to 8min. Among them, the heating temperature can be 350°C, 360°C, 400°C, 415°C, 430°C, 450°C, etc., and the insulation time can be 4min, 5min, 6min, 7.5min, 8min, etc., and the heating temperature and insulation time are not specifically limited here, as long as the rolling of the first bimetallic laminate 3 meets the processing requirements. Preferably, when rolling with the flat roller 4, the heating temperature is 400°C and the insulation time is 5 minutes. The insulation time of the hot rolling process is shorter than that of a single rolling process, so that the upper and lower surfaces of the first bimetallic laminate 3 have higher plasticity and lower deformation resistance, and the plasticity and deformation resistance at the bonding interface 13 located in the central area change less, making it easier to roll the upper and lower surfaces of the first bimetallic laminate 3 flat during the rolling process of the flat roller 4, reducing the influence of the structural rolling deformation on the grid-like wavy surface 31 formed at the bonding interface 13, and improving the bonding strength of the rolled second bimetallic laminate 5.

[0076] It should be noted that in step S200 and step S300, cold rolling can also be used. There is no specific limitation on the process of single-pass rolling and double-pass rolling, as long as the bonding interface 13 can form a grid-like wavy surface 31.

[0077] Specifically, in this embodiment, the annealing treatment of the second bimetallic laminate 5 includes: placing the second bimetallic laminate 5 in a protective atmosphere heating furnace for annealing treatment, the annealing temperature is 280℃~350℃, and the annealing time is 25min~35min. Among them, the annealing temperature can be 280℃, 295℃, 300℃, 320℃, 335℃, 350℃, etc., and the holding time can be 25min, 26min, 28min, 30min, 35min, etc., and the annealing temperature and annealing time are not specifically limited here, as long as the residual stress of the second bimetallic laminate 5 after rolling is reduced, the structural performance of the second bimetallic laminate 5 is improved, and the inner and outer grains of the second bimetallic laminate 5 are simultaneously refined, so as to ensure the forming quality and yield rate of the second bimetallic laminate 5.

[0078] Specifically, in this embodiment, after the second bimetallic laminate 5 is annealed in step S400, the rolling method further comprises: S500, finishing: trimming after straightening to produce a finished product.

[0079] During operation, the second bimetallic laminate 5 is carefully trimmed and processed to remove surface defects such as burrs and oxide scales, improve surface forming smoothness and surface hardness, and simultaneously perform dimensional inspection and correction to produce a finished product, thereby extending the service life of the second bimetallic laminate 5 and improving the forming quality of the second bimetallic laminate 5.

[0080] Table 1 Comparison of different parameters of the second bimetallic laminate 5 obtained by the two existing rolling methods and the present rolling method

[0081]

[0082] It should be noted that the three rolling methods in the above table all select "5052 grade aluminum alloy as the substrate 11, select AZ31 grade magnesium alloy plate as the double plate 12, the substrate 11 and the double plate 12 are both selected to be 100 mm long, 80 mm wide, and 2 mm high, and the thickness ratio of the substrate 11 to the double plate 12 is 1" for rolling. The corrugated roller 2 used in one pass rolling in the rolling method of this application is as follows Figure 3 and Figure 7As shown, in the method of comparative example 1, the flat roller 4 is used for rolling in both the first and second rolling passes, and in the method of comparative example 2, the corrugated roller 2 whose roller surface structure is formed by the intersection of transverse and axial corrugations is used for one rolling pass, and the flat roller 4 is used for rolling in the second rolling pass; at the same time, the mechanical properties experimental data in the above table are measured on an electronic universal testing machine, the forming properties are measured on a testing machine, and the test adopts the control variable method. Except for the different rolling methods used in the processing, the other selected parameters are the same. Combined with Table 1 above, it can be seen that compared with the existing comparative example 1, the first rolling method is different from the second rolling method. Compared with comparative example 1 and comparative example 2, the second bimetallic laminate 5 obtained by the rolling method of the present application can form a bonding interface 13 with a grid-like wavy surface 31 between the substrate 11 and the composite plate 12, and avoids as much as possible the damage of the bonding interface 13 generated by the previous rolling pass during multiple rolling passes, thereby improving the bonding strength between the substrate 11 and the composite plate 12, and effectively suppressing the warping and edge cracking of the second bimetallic laminate 5, so that the grains of the second bimetallic laminate 5 are refined, and the mechanical properties and secondary forming properties are significantly improved.

[0083] At the same time, the present invention also provides a rolling system, which is suitable for any of the above-mentioned corrugated roller rolling methods, including two driving devices, a flat roller group and a corrugated roller group, the flat roller group is composed of two flat rollers 4 set at an interval, and the corrugated roller group is composed of two corrugated rollers 2 set at an interval. The structure of the corrugated roller 2 adopts the corrugated roller 2 with a corrugated structure in the above-mentioned method, and the corrugated structure is formed by selecting a closed shape as the cross-section, and sweeping a plurality of left spiral lines 21 and a plurality of right spiral lines 22 as guide lines on the roller surface of the corrugated roller 2. The two driving devices are respectively used to drive the rotation of the flat roller group and the rotation of the corrugated roller group. The corrugated roller group is used to roll the bimetallic laminate slab 1 to form a first bimetallic laminate 3, and the flat roller group is used to roll the first bimetallic laminate 3 to form a second bimetallic laminate 5.

[0084] During operation, the operator first starts one of the driving devices so that the driving end of the driving device drives the corrugated roller group to start working. At this time, the double plate 12 and the base plate 11 are stacked to form a bimetallic laminate blank 1, and the bimetallic laminate blank 1 is placed between two spaced corrugated rollers 2 for the first rolling. After the rolling is completed, the first bimetallic laminate 3 is embedded in each other due to the influence of the corrugated structure on the surface of the corrugated roller 2, and a grid-like wave surface 31 is formed on the upper surface of the first bimetallic laminate 3, the lower surface of the first bimetallic laminate 3 and the bonding interface 13. Then, the other driving device is started so that the driving end of the driving device drives the flat roller group to start working. At this time, the first bimetallic laminate 3 is placed between two spaced corrugated rollers 2. The second rolling is carried out between the arranged flat rollers 4. After the rolling is completed, the gap at the internal fitting of the second bimetallic laminate 5 reflects the corrugated structure of the roller surface of the corrugated roller 2, and the upper surface of the second bimetallic laminate 5 and the lower surface of the second bimetallic laminate 5 are rolled into a plane. Compared with the traditional rolling system in which the rolling direction is changed by rolling with the flat roller 4, the rolling system in the present application adopts the corrugated roller 2, which can limit the plastic deformation of the composite plate 12 and the substrate 11 to a specific area through the corrugated structure on the surface of the corrugated roller 2 during the rolling process, avoid the serious edge cracks at the edge of the plate caused by the strong tensile stress along the rolling direction, and improve the bonding strength of the second bimetallic laminate 5 formed after the secondary rolling of the composite plate 12 and the substrate 11.

[0085] Specifically, in the present embodiment, the thickness ratio of the substrate 11 and the composite plate 12 is less than or equal to 3, and the two corrugated rollers 2 have the same structural parameters; or, the thickness ratio of the substrate 11 and the composite plate 12 is greater than 3, and the two corrugated rollers 2 have different structural parameters. Among them, the thickness ratio of the substrate 11 and the composite plate 12 can be 1, 2, 3, 4, 5, 7, etc., and the thickness ratio of the substrate 11 and the composite plate 12 is not specifically limited here. When the thickness ratio of the substrate 11 and the composite plate 12 is not greater than 3, the two corrugated rollers 2 can be set to the same structural parameters; when the thickness ratio of the substrate 11 and the composite plate 12 is greater than 3, it is necessary to set the two corrugated rollers 2 to different structural parameters to ensure that the corrugated roller 2 can form a grid-like wave surface 31 at the bonding interface 13 of the substrate 11 and the composite plate 12, thereby improving the forming quality and yield rate of the second bimetallic laminate 5.

[0086] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0087] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A rolling method for a corrugated roller, characterized in that: include: S100, blank making: stacking the composite plates on the top of the base plate and pressing them tightly to obtain a bimetallic laminate blank; S200, one-pass rolling: feeding the bimetallic laminate slab into two corrugated rollers arranged at intervals for rolling to form a first bimetallic laminate, so that the upper surface of the first bimetallic laminate, the lower surface of the first bimetallic laminate and the bonding interface between the composite plate and the substrate are all grid-like wave surfaces, the corrugated roller has a corrugated structure, the corrugated structure is formed by selecting a certain closed shape as a cross-section, and sweeping a plurality of left spiral lines and a plurality of right spiral lines on the roller surface of the corrugated roller as guide lines, and the left spiral lines and the right spiral lines are interlaced and distributed; S300, second-pass rolling: feeding the first bimetallic laminate into two spaced-apart flat rollers for rolling to form a second bimetallic laminate, so that the upper surface and the lower surface of the second bimetallic laminate are both planes and the bonding interface is a grid-like wavy surface; S400, annealing: performing annealing treatment on the second bimetallic laminate.

2. The rolling method of the corrugation roller according to claim 1, characterized in that: The right helix and the left helix are both cylindrical helices, and the parameter equation of the right helix is: Wherein, R is the radius of the roller surface where the cylindrical helix is ​​located, P is the lead of the cylindrical helix, b is the pitch of the cylindrical helix, T is the period of the cylindrical helix, n1 is the number of heads of the right helix, β1 is the helical angle between the right helix and the axis of the corrugation roller, The parametric equation of the left helix is: Wherein, R is the radius of the roller surface where the cylindrical helix is ​​located, P is the lead of the cylindrical helix, b is the pitch of the cylindrical helix, T is the period of the cylindrical helix, n2 is the number of heads of the left helix, β2 is the helical angle between the left helix and the axis of the corrugated roller, And the left helix and the right helix satisfy the following conditions: θ1=θ2; 3. The rolling method of the corrugated roller according to claim 1, characterized in that: The cross-sectional profile of the closed shape includes a sawtooth shape or a wave shape.

4. The corrugating roller according to claim 3, characterized in that The angle formed by the two sides of each unit tooth shape on the cross-sectional profile is greater than or equal to 60°; And / or, the distance between the peak point and the valley point of the cross-sectional profile in the radial direction of the corrugation roller is 3 mm to 5 mm.

5. The rolling method of the corrugation roller according to claim 1, characterized in that: In the one-pass rolling, the reduction rate of the corrugation roller rolling is 20% to 70%. And / or, in the second-pass rolling, the reduction ratio of the flat roll rolling is 10% to 40%.

6. The rolling method of a corrugated roller according to claim 1, characterized in that: Before feeding the first bimetallic laminate into two spaced-apart flat rollers for rolling, the rolling method further includes: using a hot rolling process to place the bimetallic laminate slab into a protective atmosphere heating furnace for heating, the heating temperature being 350°C to 450°C and the insulation time being 12min to 18min. And / or, before feeding the first bimetallic laminate into two spaced-apart flat rollers for rolling, the rolling method further includes: using a hot rolling process to place the first bimetallic laminate in a protective atmosphere heating furnace for heating, the heating temperature is 350°C to 450°C, and the insulation time is 4min to 8min.

7. The rolling method of a corrugated roller according to claim 1, characterized in that: Annealing the second bimetallic laminate includes: placing the second bimetallic laminate in a protective atmosphere heating furnace for annealing, the annealing temperature is 280° C. to 350° C., and the annealing time is 25 min to 35 min.

8. The rolling method of a corrugated roller according to claim 1, characterized in that: After annealing the second bimetallic laminate, the rolling method further comprises: S500, finishing: straightening and trimming to produce the finished product.

9. A rolling system, applicable to the rolling method of the corrugation roller according to any one of claims 1 to 8, characterized in that: It includes two driving devices, a flat roller group and a corrugated roller group, wherein the flat roller group is composed of two flat rollers arranged at an interval, and the corrugated roller group is composed of two corrugated rollers arranged at an interval, and the two driving devices are respectively used to drive the rotation of the flat roller group and the rotation of the corrugated roller group, the corrugated roller group is used to roll the bimetallic laminate slab to form the first bimetallic laminate, and the flat roller group is used to roll the first bimetallic laminate to form the second bimetallic laminate.

10. The rolling system according to claim 9, characterized in that The thickness ratio of the base plate to the double plate is less than or equal to 3, and the two corrugated rollers have the same structural parameters; Alternatively, the thickness ratio of the base plate to the double plate is greater than 3, and the two corrugated rollers have different structural parameters.

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