Rolling method and equipment for a bimetal composite plate

Abstract

The present invention discloses a rolling method and equipment for a bimetallic composite plate, which relates to the technical field of metal composite plate preparation, in order to solve the problems of high rolling cost and low yield rate of bimetallic composite plates in the prior art. The method comprises: providing a target substrate, a target cover plate and a target lining plate; the target substrate and the target cover plate have equal length and width, and different metal materials; the target lining plate is a lining plate with a target prefabricated curvature made based on a lining plate blank with equal length and width to the target substrate; the target substrate and the target cover plate are stacked and assembled to obtain a first composite blank; based on the target lining plate and the first composite blank, a first rolled piece is made; the first rolled piece is rolled to obtain a second rolled piece; the lining plate on the second rolled piece is peeled off to obtain a bimetallic composite plate; thereby improving the bonding strength of the lateral edges of the bimetallic composite plate, improving the yield rate of the bimetallic composite plate, and reducing the use cost.

Description

Technical Field

[0001] The invention relates to the technical field of metal composite plate preparation, in particular to a rolling method and equipment for a bimetallic composite plate. Background Art

[0002] Metal composite plates can greatly improve the thermal expansion, strength, toughness, wear resistance, corrosion resistance, electrical properties, magnetic properties and many other properties of single metal materials. They not only have the advantages of both substrates and cover plates, but also greatly reduce the use of rare and precious metals and reduce production costs. They have extremely high cost performance and have broad application prospects in the fields of ships, marine engineering, petrochemical equipment, etc.

[0003] Although there are many methods for preparing metal composite plates, each of which has its own advantages, most of them require rolling as a subsequent process. For the preparation of bimetallic composite plates by rolling composite method, a common problem is the uneven distribution of the transverse bonding strength of the composite plate. This is because during the rolling process, the metal plate is compressed in the thickness direction. According to the law of volume invariance, the volume of the rolled piece is equal before and after rolling, so the composite plate will have a larger extension along the rolling direction and a smaller expansion along the width direction. In this process, according to the law of minimum resistance along the width direction, the metal flow direction of the composite plate from the edge to the center and then to the edge in the width direction is along the width direction to along the rolling direction and then along the width direction. Due to the different metal flow directions, the radial compressive stress distribution of the composite plate from the edge to the middle during the rolling process is uneven, the edge bonding strength of the composite plate decreases and the waste area increases, resulting in high rolling cost and low yield of bimetallic composite plates.

[0004] Therefore, in order to improve the rolling yield rate of bimetallic composite plates and reduce the rolling cost, it is urgent to design a technical solution that can improve the edge bonding strength of the composite plate and increase the usable area of ​​the edge of the composite plate, so as to solve the problems of high rolling cost and low rolling yield rate of bimetallic composite plates in the existing technology. Summary of the invention

[0005] The purpose of the present invention is to provide a rolling method and equipment for a bimetallic composite plate, which uses a lining plate blank with the same length and width as the composite material to make a target lining plate, and sends the target lining plate and the composite material into a rolling mill for rolling to obtain a bimetallic composite plate; due to the addition of the target lining plate, the compressive stress at the edge of the bimetallic composite plate is increased, the availability of the edge material is improved, and the utilization rate of the bimetallic composite plate is reduced; thereby solving the problems of high rolling cost and low yield of bimetallic composite plates in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a rolling method for a bimetallic composite plate, which may include:

[0008] Providing a target substrate, a target cladding plate, and a target lining plate; the length and width of the target substrate and the target cladding plate are equal; the metal materials of the target substrate and the target cladding plate are different; the target lining plate is a lining plate with a target prefabricated curvature made based on a lining plate blank having the same length and width as the target substrate;

[0009] Stacking and blanking the target substrate and the target cladding plate to obtain a first composite blank;

[0010] Based on the target lining plate and the first composite blank, manufacturing a first rolled piece;

[0011] Performing rolling treatment on the first rolled piece to obtain a second rolled piece;

[0012] Peeling off the lining plate on the second rolled piece to obtain a bimetallic composite plate.

[0013] Preferably, before providing the target lining plate, it may include:

[0014] Obtaining the dimensions of the target substrate and the target cladding plate; using finite element analysis software to determine the target prefabricated position and the target prefabricated radius acting on the upper surface of the lining plate blank;

[0015] Based on the target prefabricated position and the target prefabricated radius, performing curvature prefabrication on the lining plate blank to obtain the target lining plate.

[0016] Preferably, the step of using finite element analysis software to determine the target prefabricated position and the target prefabricated radius acting on the upper surface of the lining plate blank may include:

[0017] Based on the dimensions of the target substrate, the target cladding plate, and the lining plate blank, using finite element analysis software to obtain a simulated target substrate, a simulated target cladding plate, and a simulated lining plate blank;

[0018] Stacking and blanking the simulated target substrate and the simulated target cladding plate to obtain a third composite blank;

[0019] Extracting a first principal stress data set of the third composite blank; the first principal stress data set is a set of radial principal stresses at the bimetallic bonding interface on the rolling neutral plane of the third composite blank;

[0020] Based on the first principal stress data set, plotting a first principal stress distribution curve;

[0021] According to the position where the compressive stress starts to decrease in the first principal stress distribution curve, setting the preset position and the preset radius of the prefabricated curvature acting on the simulated lining plate blank;

[0022] Manufacture a first prefabricated liner according to a preset position and a preset radius;

[0023] Manufacture a third rolled piece based on the first prefabricated liner and the third composite blank;

[0024] Extract a second principal stress data set of the third rolled piece; the second principal stress data set is a set of radial principal stresses at the bimetal bonding interface on the rolling neutral plane of the third rolled piece;

[0025] Draw a second principal stress distribution curve based on the second principal stress data set;

[0026] Determine a target prefabrication position and a target prefabrication radius acting on the upper surface of the liner blank based on the first principal stress distribution curve and the second principal stress distribution curve.

[0027] Preferably, the determining the target prefabrication position and the target prefabrication radius acting on the upper surface of the liner blank based on the first principal stress distribution curve and the second principal stress distribution curve may include:

[0028] Determine a first target principal stress point based on the first principal stress distribution curve; the first target principal stress point is the coordinate point at which the edge compressive stress of the bimetal composite plate represented in the first principal stress distribution curve starts to decrease;

[0029] Determine a second target principal stress point based on the second principal stress distribution curve; the second target principal stress point is the coordinate point at which the edge compressive stress of the bimetal composite plate represented in the second principal stress distribution curve starts to decrease;

[0030] Determine the actual distance between the initial drop point of the principal stress at the bimetal composite plate bonding interface on the rolling neutral plane of the third rolled piece and the two side edges of the bimetal composite plate according to the coordinate data corresponding to the second target principal stress point;

[0031] If the actual distance is less than or equal to the target distance, determine the preset position and the preset radius corresponding to the manufacture of the first prefabricated liner as the target prefabrication position and the target prefabrication radius acting on the liner blank;

[0032] If the actual distance is greater than the target distance, adjust the thickness, the prefabricated arc radius, and the prefabricated arc position of the liner blank to manufacture a second prefabricated liner; manufacture a fourth rolled piece that meets the requirements based on the second prefabricated liner and the third composite blank; the actual distance between the initial drop point of the principal stress at the bimetal composite plate bonding interface on the rolling neutral plane of the fourth rolled piece and the two side edges of the bimetal composite plate is less than or equal to the target distance.

[0033] Preferably, the step of prefabricating the arc of the liner blank based on the target prefabrication position and the target prefabrication radius to obtain the target liner may include:

[0034] Determine the target prefabrication arc of the upper surface of the liner blank in the target prefabrication direction according to the target prefabrication position and the target prefabrication radius; the target prefabrication direction is the direction of prefabricating the arc from the edge to the middle along the transverse direction of the liner blank;

[0035] Based on the target prefabrication arc and the target prefabrication direction, prefabricate the arc of the upper surface of the liner blank to obtain the target liner.

[0036] Preferably, the step of manufacturing the first rolled piece based on the target liner and the first composite blank may include:

[0037] Heat-treat the first composite blank according to a preset temperature to obtain a second composite blank;

[0038] Manufacture the first rolled piece based on the target liner and the second composite blank.

[0039] Preferably, the step of manufacturing the first rolled piece based on the target liner and the second composite blank may include: uniformly applying an isolation material on the lower surface of the target liner to obtain a prefabricated target liner; stacking the prefabricated target liner on the second composite blank in a positive manner and transporting it to a rolling mill for rolling to obtain the first rolled piece.

[0040] Preferably, before stacking and assembling the target base plate and the target cover plate, it may include: pre-treating the surfaces to be composite of the target base plate and the target liner; the pre-treatment includes at least one or more of sandblasting, pickling, machining, and cleaning.

[0041] Preferably, the hardness of the target base plate is greater than or equal to the hardness of the target cover plate, and the hardness of the target liner is greater than the hardness of the target base plate; the thickness of the target liner is 0.1 to 2 times the thickness of the target base plate, and the radius of the target prefabrication arc is 0.1 to 5 times the thickness of the target base plate.

[0042] In a second aspect, the present invention provides a rolling device for a bimetallic composite plate, characterized in that the rolling device may include a providing unit, an assembling unit, a manufacturing unit, a rolling unit, and a peeling unit;

[0043] The providing unit is used to provide a target substrate, a target cover plate and a target liner plate; the target substrate and the target cover plate have the same length and width; the target substrate and the target cover plate are made of different metal materials; the target liner plate is a liner plate with a target prefabricated curvature made from a liner plate blank having the same length and width as the target substrate;

[0044] The assembly unit is used to stack and assemble the target substrate and the target cover plate to obtain a first composite blank;

[0045] The manufacturing unit is used to manufacture a first rolled piece based on the target liner and the first composite blank;

[0046] The rolling unit is used to perform rolling processing on the first rolled piece to obtain a second rolled piece;

[0047] The stripping unit is used to strip the liner from the second rolled piece to obtain a bimetallic composite plate.

[0048] Compared with the prior art, the present invention provides a rolling method for a bimetallic composite plate, which provides a target substrate, a target cover plate and a target lining plate; wherein the target substrate and the target cover plate have equal length and width, and the target substrate and the target cover plate have different metal materials; the target lining plate is a lining plate with a target prefabricated curvature made based on a lining plate blank with equal length and width to the target substrate; firstly, the target substrate and the target cover plate are stacked and assembled to obtain a first composite blank; further, a first rolled piece is made based on the target lining plate and the first composite blank; the first rolled piece is rolled to obtain a second rolled piece; finally, the lining plate on the second rolled piece is peeled off to obtain a bimetallic composite plate; based on this, the present invention increases the bonding strength of the lateral edge of the bimetallic composite plate by adding a target lining plate, combining the target lining plate with the bimetallic composite blank and then rolling them, thereby expanding the yield rate of the composite material of the lateral edge of the bimetallic composite plate, reducing the waste area, and thus reducing the use cost of the bimetallic composite plate; the problems of high rolling cost and low yield rate of the bimetallic composite plate in the prior art are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] 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:

[0050] Figure 1 A main flow chart of a rolling method of a bimetallic composite plate provided by the present invention;

[0051] Figure 2 A main flow chart of manufacturing a target liner in a rolling method of a bimetallic composite plate provided by the present invention;

[0052] Figure 3 The main flowchart of the target liner for the simulation design of a rolling method for a bimetallic composite plate provided by the present invention;

[0053] Figure 4 A schematic diagram for comparing the transverse principal stress distribution curves of the rolling neutral plane before and after adding the target liner for a rolling method for a bimetallic composite plate provided by the present invention;

[0054] Figure 5 A schematic cross-sectional view of the prefabricated radian of the target liner for a rolling method for a bimetallic composite plate provided by the present invention;

[0055] Figure 6 An overall axonometric schematic diagram after prefabricating the radian of the target liner for a rolling method for a bimetallic composite plate provided by the present invention;

[0056] Figure 7 A schematic structural diagram of a rolling device for a bimetallic composite plate provided by the present invention.

[0057] Reference numerals: 700 - rolling device, 710 - providing unit, 720 - blank assembling unit, 730 - manufacturing unit, 740 - rolling unit, 750 - peeling unit. Detailed implementation manners

[0058] For the convenience of clearly describing the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, terms such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and effects. For example, the first threshold and the second threshold are only used to distinguish different thresholds, and do not limit their sequence. Those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity and execution order, and "first", "second", etc. do not necessarily mean different.

[0059] It should be noted that in the present invention, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present invention should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly, using words such as "exemplary" or "for example" is intended to present related concepts in a specific manner.

[0060] In the present invention, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects in the previous time are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b and c, where a, b, c can be single or multiple.

[0061] At present, bimetallic composite plates are compressed in the thickness direction during the rolling process. According to the law of constant volume, the volume of the rolled piece is equal before and after rolling, so the composite plate will have a larger extension along the rolling direction and a smaller expansion along the width direction. According to the law of least resistance along the width direction, the metal flow direction of the composite plate from the edge to the center and then to the edge in the width direction is along the expansion direction to the rolling direction and then along the expansion direction. Due to the different metal flow directions, the radial compressive stress distribution of the composite plate from the edge to the middle during the rolling process is uneven, which leads to a decrease in the edge bonding strength of the composite plate, thereby increasing the scrap area at the edge, resulting in a lower yield rate and a higher cost of metal material use.

[0062] In view of this, in order to improve the problem of reduced bonding strength at the lateral edges of the bimetallic composite plate, the present invention provides a rolling method and equipment for a bimetallic composite plate, by utilizing a lining plate having the same length and width as the bimetallic composite plate, to manufacture a target lining plate having a target prefabricated curvature at the edge, and the target lining plate and the bimetallic composite billet are rolled together to obtain a bimetallic composite plate, thereby improving the bonding strength at the lateral edges of the bimetallic composite plate, improving the yield of the bimetallic composite plate, and reducing the cost of use.

[0063] Next, the technical solution of the present invention is described in detail with reference to the accompanying drawings:

[0064] See also Figure 1 , Figure 1 The main flow chart of a rolling method of a bimetallic composite plate provided by the present invention is a server or terminal device equipped with the technical solution disclosed in the embodiment of the present invention, such as a plate rolling platform or a small rolling equipment.

[0065] exist Figure 1 In, the method may include:

[0066] Step 110: Provide a target substrate, a target cover plate and a target liner plate; the target substrate and the target cover plate have equal length and width; the target substrate and the target cover plate are made of different metal materials; the target liner plate is a liner plate with a target prefabricated curvature made based on a liner plate blank having the same length and width as the target substrate.

[0067] Step 120: stacking and assembling the target substrate and the target cover plate to obtain a first composite blank; wherein the stacking and assembling method may include one or more of welding, binding and riveting.

[0068] Step 130: manufacturing a first rolled piece based on the target liner and the first composite blank.

[0069] In step 110 to step 130, a target substrate, a target cover plate and a target liner are first provided, wherein the length and width of the target substrate and the target cover plate are equal, and the target liner is a liner with a target prefabricated curvature made based on a liner blank with the same length and width as the target substrate; it can be understood that the length and width of the liner blank are also equal to the length and width of the target cover plate. The target substrate and the target cover plate are further stacked and assembled to form a first composite blank, and then the target liner plate and the first composite blank are used to make a first rolled piece, so that step 140 can be performed to send the first rolled piece to a rolling mill for rolling processing. Among them, the role of the target liner is to improve the bonding strength of the edges of the bimetallic material composed of the target substrate and the target cover plate during the rolling process, thereby improving the yield rate of the bimetallic material and obtaining a bimetallic composite plate with higher quality and better effect.

[0070] Step 140: rolling the first rolled part to obtain a second rolled part.

[0071] Step 150: peeling off the liner on the second rolled piece to obtain a bimetallic composite plate.

[0072] In step 140 to step 150, the first rolled piece is first sent to a rolling mill for rolling treatment to obtain a second rolled piece, and then the liner on the second rolled piece is peeled off, thereby obtaining the bimetallic composite plate to be obtained by the present invention; since the bimetallic composite billet is combined with the target liner and then sent to the rolling mill for rolling, with the support of the target liner, the bonding strength of the edges of the bimetallic composite billet during the rolling process can be increased, thereby improving the yield of the billet and reducing the use cost of the metal material.

[0073] Compared with the prior art, the present invention provides a rolling method for a bimetallic composite plate, which comprises providing a target substrate, a target cover plate and a target lining plate; wherein the target substrate and the target cover plate have the same length and width, and the target substrate and the target cover plate have different metal materials, and the target lining plate is a lining plate with a target prefabricated curvature made based on a lining plate blank having the same length and width as the target substrate; the target substrate and the target cover plate are stacked and assembled to obtain a first composite blank; a first rolled piece is made based on the target lining plate and the first composite blank; the first rolled piece is further rolled to obtain a second rolled piece; and finally the lining plate on the second rolled piece is peeled off to obtain a bimetallic composite plate; based on this, in the rolling process of the bimetallic composite blank, the bonding strength of the lateral edge of the bimetallic composite plate is increased based on the target lining plate, the yield rate of the composite material of the lateral edge of the bimetallic composite plate is expanded, the waste area is reduced, and thus the use cost of the bimetallic composite plate is reduced.

[0074] Before step 110, preferably, refer to Figure 2 , Figure 2 The present invention provides a main flow chart for manufacturing a target liner in a rolling method of a bimetallic composite plate.

[0075] exist Figure 2 In the process, i.e. before providing the target liner, it may include:

[0076] Step 210: Obtain the sizes of the target substrate and the target cover plate.

[0077] Step 220: Using finite element analysis software, determine the target prefabrication position and target prefabrication radius acting on the upper surface of the liner blank.

[0078] Step 230: Based on the target prefabrication position and the target prefabrication radius, perform arc prefabrication on the liner blank to obtain the target liner.

[0079] In steps 210 to 230, the target substrate and target cover plate are metal plates with relatively regular length and width that can be manufactured and measured using conventional technical means; the target lining plate is based on a lining plate blank with the same length and width as the target substrate and the target cover plate, and a lining plate with a target preset position on its upper surface is manufactured according to a target preset radius to obtain a lining plate with a target curvature; therefore, it is necessary to first use finite element analysis software to determine how to manufacture the target lining plate, and then manufacture the target lining plate based on the target prefabrication position and target prefabrication radius obtained from the simulation results.

[0080] In step 220, preferably, refer to Figure 3 , Figure 3 The main flow chart of the simulation design target liner of the rolling method of a bimetallic composite plate provided by the present invention.

[0081] existFigure 3 In this method, by using finite element analysis software, the target prefabrication position and target prefabrication radius acting on the upper surface of the liner blank can be determined, which may include:

[0082] Step 2201: Based on the dimensions of the target base plate, target cover plate, and liner blank, use finite element analysis software to obtain a simulated target base plate, a simulated target cover plate, and a simulated liner blank.

[0083] Step 2202: Stack and form the simulated target base plate and the simulated target cover plate to obtain a third composite blank.

[0084] Step 2203: Extract the first principal stress data set of the third composite blank; the first principal stress data set is a set of radial principal stresses at the bimetallic bonding interface on the rolling neutral plane of the third composite blank.

[0085] Step 2204: Based on the first principal stress data set, plot the first principal stress distribution curve.

[0086] Step 2205: According to the position where the compressive stress starts to decline in the first principal stress distribution curve, set the preset position and preset radius of the prefabricated arc acting on the simulated liner blank.

[0087] Step 2206: According to the preset position and preset radius, fabricate the first prefabricated liner.

[0088] Step 2207: Based on the first prefabricated liner and the third composite blank, fabricate the third rolled piece.

[0089] Step 2208: Extract the second principal stress data set of the third rolled piece; the second principal stress data set is a set of radial principal stresses at the bimetallic bonding interface on the rolling neutral plane of the third rolled piece.

[0090] Step 2209: Based on the second principal stress data set, plot the second principal stress distribution curve; preferably, the first prefabricated liner is stacked directly on the third composite blank to obtain the third rolled piece.

[0091] Step 2210: Based on the first principal stress distribution curve and the second principal stress distribution curve, determine the target prefabrication position and target prefabrication radius acting on the upper surface of the liner blank.

[0092] Steps 2201 to 2210 are the specific steps in a rolling method for a bimetallic composite plate provided by the present invention on how to obtain the target prefabrication position and target prefabrication radius acting on the upper surface of the liner blank through finite element analysis.

[0093] Please refer to Figure 4 , Figure 4Schematic diagram for comparison of transverse principal stress distribution curves of the rolling neutral plane before and after adding the target liner in a rolling method of a bimetallic composite plate provided by the present invention. In Figure 4 , the horizontal axis represents the width of the bimetallic composite plate (i.e., the transverse direction of the composite plate), with the unit of millimeter. Taking the width of the bimetallic composite plate being 60 mm as an example, 0 mm represents the side position of the bimetallic composite plate, and 30 mm represents the transverse midline position of the bimetallic composite plate; the vertical axis represents the compressive stress (principal stress) S22, with the unit of megapascal; the “ ” curve represents the stress curve C1 before adding the liner, that is, the compressive stress distribution curve before adding the target liner, and point B is the point (position) where the compressive stress starts to decrease; the “ ” curve represents the stress curve C2 after adding the liner, that is, the distribution curve of the compressive stress after adding the target liner, and point A is the point (position) where the compressive stress starts to decrease. It should be noted that the principal stress at a certain position of the rolled piece corresponds to the compressive stress that the rolling mill needs to apply to this position point on the rolled piece.

[0094] Specifically, first, use finite element analysis software to extract the principal stress S22 along the radial direction at the bonding interface of the bimetallic composite plate on the rolling neutral plane before adding the liner, and obtain the stress distribution curve C1 before adding the liner. According to the position where the compressive stress starts to decrease in C1, preset the position and radius of the prefabricated arc of the liner; further, extract the compressive stress along the radial direction at the bonding interface of the bimetallic composite plate on the rolling neutral plane after adding the liner, and obtain the stress distribution curve C2 after adding the liner; finally, adjust the position and radius of the prefabricated arc according to the comparison of the stress distribution changes before and after, until the point where the compressive stress starts to decrease at the bonding interface of the bimetallic composite plate on the rolling neutral plane is within 5% of the two side edges.

[0095] Preferably, in step 2210, based on the first principal stress distribution curve and the second principal stress distribution curve, determining the target prefabricated position and target prefabricated radius acting on the upper surface of the liner blank may include:

[0096] Based on the first principal stress distribution curve, determine the first target principal stress point; wherein, the first target principal stress point is the coordinate point representing the start of the decrease in the edge compressive stress of the bimetallic composite plate in the first principal stress distribution curve; that is, Figure 4 the position of point B in

[0097] Based on the second principal stress distribution curve, determine the second target principal stress point; wherein, the second target principal stress point is the coordinate point representing the start of the decrease in the edge compressive stress of the bimetallic composite plate in the second principal stress distribution curve.

[0098] According to the coordinate data corresponding to the second target principal stress point, determine the actual distance between the initial decrease point of the principal stress at the bonding interface of the bimetallic composite plate on the rolling neutral plane of the third rolled piece and the two side edges of the bimetallic composite plate;

[0099] If the actual distance is less than or equal to the target distance, the preset position and preset radius corresponding to the production of the first prefabricated lining plate are determined as the target prefabricated position and target prefabricated radius acting on the lining plate blank; if the actual distance is greater than the target distance, the thickness, prefabricated arc radius and prefabricated arc position of the lining plate blank are adjusted to produce the second prefabricated lining plate; based on the second prefabricated lining plate and the third composite blank, a fourth rolled part that meets the requirements is produced; wherein the actual distance between the initial drop point of the principal stress at the interface of the bimetallic composite plate on the rolling neutral plane of the fourth rolled part and the edges of both sides of the bimetallic composite plate is less than or equal to the target distance; that is, Figure 4 The position of point A must be less than or equal to the target distance.

[0100] It should be noted that, in the process of adjusting the thickness of the lining blank, the prefabricated arc radius and the prefabricated arc position to make the second prefabricated lining, it is necessary to refer to the actual distribution of the first principal stress distribution curve and the second principal stress distribution curve, so that the stress starting point in the second principal stress distribution curve is closer to the edge than the stress starting point in the first principal stress curve; if the position and radius are set unreasonably, it may cause the stress starting point to be closer to the center of the lining blank after adding the lining.

[0101] Specifically, when the actual distance is greater than the target distance, there may be the following two situations:

[0102] 1. If the stress fluctuation amplitude is too large after adding the prefabricated liner, reduce the thickness of the liner, increase the radius of the prefabricated arc, and move the prefabricated arc position to the edge of the liner; the thickness of the prefabricated liner is any value between 0.1 and 2 times the target substrate thickness, and the end position of the prefabricated arc is the position where the principal stress indicated in the first principal stress curve begins to decrease.

[0103] 2. If the stress fluctuation amplitude is too small after adding the prefabricated liner, increase the liner thickness, reduce the prefabricated arc radius, and move the prefabricated arc position toward the center of the liner.

[0104] Based on the adjusted parameters, based on steps 2206 to 2210, the Nth prefabricated liner is prefabricated, and the Nth rolled piece is made based on the Nth prefabricated liner and the third composite blank; the Nth principal stress data set of the Nth rolled piece is extracted, and the corresponding principal stress curve is drawn; when the actual distance between the initial drop point of the principal stress at the interface of the bimetallic composite plate on the rolling neutral plane of the Nth rolled piece and the edges on both sides of the bimetallic composite plate is less than or equal to the target distance, the fourth rolled piece is obtained; wherein the target distance is preferably 5% of the width of the bimetallic composite plate, that is, the width from the edges on both sides of the bimetallic composite plate is not greater than 5% of the width of the bimetallic composite plate. For example: if the width of the first composite plate blank is X, then the target distance is X×0.05; thereby improving the yield rate of the composite material and improving the rolling quality of the composite material.

[0105] Further, please refer to Figures 5 to 6 , Figure 5 , which is a schematic cross-sectional view of the prefabricated arc of the target liner for a rolling method of a bimetallic composite plate provided by the present invention; Figure 6 , which is an overall axonometric view of the target liner after prefabricating the arc for a rolling method of a bimetallic composite plate provided by the present invention.

[0106] Preferably, based on the target prefabrication position and the target prefabrication radius, prefabricating the arc of the liner blank to obtain the target liner may include: determining the target prefabricated arc of the upper surface of the liner blank in the target prefabrication direction according to the target prefabrication position and the target prefabrication radius; the target prefabrication direction is the direction of prefabricating the arc along the transverse direction of the liner blank from the edge to the middle of the liner blank; based on the target prefabricated arc and the target prefabrication direction, prefabricating the upper surface of the liner blank to obtain the target liner.

[0107] Specifically, in Figure 5 , L represents the transverse width of the liner blank, t is the thickness of the base plate, and the thickness of the liner can be 0.1 to 2 times the thickness of the base plate; the target prefabrication radius can be 0.1 to 5 times the thickness of the base plate. Based on this, using the target prefabrication position and the target prefabrication radius obtained by the finite element analysis software, prefabricating the arc of the liner blank in the target prefabrication direction, the target liner as shown in Figure 6 is obtained.

[0108] As an example, the thickness T1 of the liner blank can be preset within the range of 0.1 - 2 times the thickness of the base plate first, and the end position of the prefabricated arc is located at the point where the compressive stress starts to decrease in the curve C1. According to the decreasing amplitude of the edge compressive stress of the bimetallic composite plate, the radius R1 of the prefabricated arc is preset within the range of 0.1 - 5 times the thickness of the base plate, and then the starting point of the prefabricated arc can be determined accordingly. Next, compare curve C2 with curve C1. If the point where the edge compressive stress of the bimetallic composite plate starts to decrease moves significantly towards the edge and the overall compressive stress increases, it can be considered that the transverse bonding strength of the bimetallic composite plate is improved; if the effect is not ideal, reset the thickness T2 of the liner blank and the radius R2 of the prefabricated arc according to C1 and C2; for example: if the stress fluctuation amplitude is too large after adding the liner, then decrease T2, increase R2, and move the prefabrication arc position towards the edge at the same time; conversely, increase T2, decrease R2, and move the prefabrication arc position towards the center; thus obtaining the stress distribution curve C3 after changing the parameters, and compare C3 with C1, and so on, until the point where the compressive stress starts to decrease at the bonding interface of the bimetallic composite plate on the rolling neutral plane is within 5% of both edges.

[0109] Based on this, the finite element analysis method provided by the present invention is used to determine the target prefabrication position and target prefabrication radius acting on the upper surface of the liner blank, thereby obtaining the stress change curve of the simulated rolling bimetallic composite plate, such as Figure 4 The black curve shown in the figure has a point where the compressive stress drops at a distance of about 2.0 mm from the edge of the bimetallic composite blank. Compared with the stress drop point of 10 mm without adding the target liner, the yield rate of the bimetallic composite plate is greatly increased.

[0110] In step 120, preferably, manufacturing a first rolled piece based on the target liner and the first composite billet may include: heating the first composite billet according to a preset temperature to obtain a second composite billet; and manufacturing the first rolled piece based on the target liner and the second composite billet.

[0111] Specifically, the first composite billet is heated at a preset temperature to obtain a second composite billet having a preset temperature, i.e., a hot composite billet; while the target liner is in an unheated state. Based on this, the hot composite billet is combined with the cold target liner and then rolled, which is more conducive to increasing the edge strength of the composite billet during the rolling process and is also more conducive to the peeling of the liner after rolling.

[0112] Preferably, making a first rolled part based on the target liner and the second composite billet may include: evenly applying an isolation material on the lower surface of the target liner to obtain a prefabricated target liner; stacking the prefabricated target liner on the second composite billet, transferring it to a rolling mill for rolling, and obtaining a first rolled part; wherein, in the second composite billet, the target substrate is on top and the target cover is on the bottom; that is, the substrate is in contact with the target liner.

[0113] Preferably, before stacking and assembling the target substrate and the target cover plate, the following steps may be performed: pre-treating the surfaces of the target substrate and the target liner plate to be composited; the pre-treatment may include at least one or more of sandblasting, pickling, machining and cleaning.

[0114] Preferably, the hardness of the target substrate is greater than or equal to the hardness of the target cover plate, and the hardness of the target lining plate is much greater than the hardness of the target substrate. For example, the hardness of the target lining plate can be 5, 6 or 10 times that of the target substrate, which can be set according to requirements in practical applications; the thickness of the target lining plate is 0.1 to 2 times the thickness of the target substrate, and the radius of the target prefabricated arc is 0.1 to 5 times the thickness of the target substrate.

[0115] In order to further illustrate the technical solution of the present invention, a specific metal sheet is used as an example to further explain the technical solution in detail. Embodiment 1:

[0116] Taking the rolling composite process of a titanium-steel composite plate as an example, the size of the target steel plate is 100mm×60mm×3mm, the size of the target titanium plate is 100mm×60mm×2mm, and the size of the backing plate blank is 100mm×60mm×3.5mm. Among them, the steel plate serves as the base plate, and the titanium plate serves as the clad plate. The size parameters are all length×width×height.

[0117] A rolling method for a bimetallic composite plate provided by the present invention may include the following steps:

[0118] S1. Using the finite element analysis method in steps 2201 to 2210, perform simulation calculations to obtain the target preset position and target prefabricated radius for manufacturing the target backing plate; thereby prefabricating the radian of the backing plate blank to obtain the target backing plate. In the target backing plate, the end position of the transition arc is 8mm away from the edge of the backing plate, and the radius of the transition arc is 7.5mm.

[0119] S2. Apply a release agent to the lower surface of the target backing plate.

[0120] S3. Perform surface pretreatment on the surfaces to be composite of the target steel plate and the target titanium plate.

[0121] S4. Stack and form the treated steel plate and titanium plate into a billet. The forming method is edge welding to obtain a titanium-steel composite plate billet.

[0122] S5. Heat the formed titanium-steel composite plate billet in a tube-type vacuum heating furnace at 850°C for 1h.

[0123] S6. Send the heated titanium-steel composite plate and the backing plate together to a two-high rolling mill for single-pass rolling with a reduction rate of 30%. Among them, the lower surface of the backing plate is placed opposite to the upper surface of the composite billet.

[0124] S7. Separate the backing plate to obtain the finished titanium-steel composite plate. Example 2:

[0125] Taking the rolling composite process of a steel-aluminum composite plate as an example, the size of the target steel plate is 300mm×180mm×20mm, the size of the target aluminum plate is 300mm×180mm×16mm, and the size of the backing plate blank is 300mm×180mm×5.5mm; among them, the steel plate serves as the base plate, and the aluminum plate serves as the clad plate. The size parameters are all length×width×height.

[0126] A rolling method for a bimetallic composite plate provided by the present invention may include the following steps:

[0127] S1. Using the finite element analysis method in step 2201 to step 2210, simulation calculation is performed to obtain the target preset position and target prefabrication radius of the target liner; thereby arc prefabrication is performed on the liner blank to obtain the target liner. In the target liner, the transition arc end position is 12 mm away from the liner edge, and the transition arc radius is 10 mm.

[0128] S2. Apply a release agent to the lower surface of the target liner.

[0129] S3. Surface treatment is performed on the surfaces of the steel plate and the aluminum plate to be composited.

[0130] S4. The processed steel plates and aluminum plates are stacked and assembled by edge binding to obtain steel-aluminum composite plate blanks.

[0131] S5. The assembled steel-aluminum composite plate blank is heated in a box-type heating furnace at 500° C. for 1.5 h.

[0132] S6. The heated steel-aluminum composite plate and the liner are sent to a two-roll rolling mill for single-pass rolling with a 40% reduction rate, wherein the lower surface of the liner is placed opposite to the upper surface of the composite billet.

[0133] S7, separating the liner to obtain a finished steel-aluminum composite plate.

[0134] Based on this, the present invention provides a rolling method for a bimetallic composite plate, and the interface bonding strength of the obtained bimetallic composite plate is improved as a whole, and the compressive stress at the same position near the edge is increased, which can effectively reduce the trimming width and improve product quality and yield rate; and adding a liner with a prefabricated arc during the rolling process can greatly improve the problem of rapid strength drop at the edge of the bimetallic composite plate, and at the same time can effectively reduce the total reduction rate required for rolling while meeting the target bonding strength, reduce the loss of rolling equipment, and reduce the number of rolling passes; the position and radius of the prefabricated arc on the upper surface of the liner can also be adjusted to achieve the effect of regulating the stress distribution, thereby realizing the control of the lateral bonding strength of the bimetallic composite plate.

[0135] In a second aspect, based on the same technical concept as the first aspect, the present invention provides a rolling device for a bimetallic composite plate. Figure 7 , Figure 7 A schematic structural diagram of a bimetallic composite plate rolling device provided by the present invention.

[0136] exist Figure 7 In the embodiment, the rolling equipment 700 includes a providing unit 710 , an assembling unit 720 , a manufacturing unit 730 , a rolling unit 740 and a stripping unit 750 .

[0137] The providing unit 710 is used to provide a target substrate, a target cover plate and a target lining plate; the target substrate and the target cover plate have equal length and width; the target substrate and the target cover plate are made of different metal materials; the target lining plate is a lining plate with a target prefabricated curvature made based on a lining plate blank with the same length and width as the target substrate.

[0138] The assembly unit 720 is used to stack and assemble the target substrate and the target cover plate to obtain a first composite blank.

[0139] The manufacturing unit 730 is used to manufacture a first rolled piece based on the target liner and the first composite blank.

[0140] The rolling unit 740 is used to perform rolling processing on the first rolled piece to obtain a second rolled piece.

[0141] The stripping unit 750 is used to strip the liner from the second rolled piece to obtain a bimetallic composite plate.

[0142] Based on this, the present invention provides a rolling equipment 700 for a bimetallic composite plate, which is provided by setting a providing unit 710, a blanking unit 720, a manufacturing unit 730, a rolling unit 740 and a stripping unit 750. The providing unit 710 is used to provide a target substrate, a target cover plate and a target lining plate; the length and width of the target substrate and the target cover plate are equal; the metal materials of the target substrate and the target cover plate are different; the target lining plate is a lining plate with a target prefabricated curvature made based on a lining plate blank with the same length and width as the target substrate. First, the blanking unit 720 is used to stack and assemble the target substrate and the target cover plate to obtain a first composite blank; then, the manufacturing unit 730 is used to manufacture a first rolled piece based on the target lining plate and the first composite blank; then, the rolling unit 740 is used to roll the first rolled piece to obtain a second rolled piece; finally, the stripping unit 750 is used to strip the lining plate on the second rolled piece to obtain a bimetallic composite plate. Thereby, during the rolling process of the bimetallic composite billet, the bonding strength of the lateral edge of the bimetallic composite plate is increased based on the target liner, the yield rate of the composite material of the lateral edge of the bimetallic composite plate is expanded, the waste area is reduced, and the use cost of the bimetallic composite plate is reduced.

[0143] Although the present invention is described herein in conjunction with various embodiments, in the process of implementing the claimed invention, those skilled in the art may understand and implement other variations of the disclosed embodiments by viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "one" or "an" does not exclude multiple situations. A single processor or other unit may implement several functions listed in a claim. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0144] Although the present invention has been described in connection with specific features and their embodiments, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the invention. Accordingly, the present specification and drawings are merely exemplary illustrations of the invention defined by the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A rolling method for a bimetallic composite plate, characterized in that: include: providing a target substrate, a target cover plate, and a target backing plate; The target substrate and the target cover plate have equal length and width; The target substrate and the target cover plate are made of different metal materials; The target lining plate is a lining plate with a target prefabrication curvature made based on a lining plate blank having the same length and width as the target substrate; wherein, before providing the target lining plate, it includes: obtaining the dimensions of the target substrate and the target cover plate; using finite element analysis software to determine the target prefabrication position and target prefabrication radius acting on the upper surface of the lining plate blank; based on the target prefabrication position and the target prefabrication radius, performing curvature prefabrication on the lining plate blank to obtain the target lining plate, including: determining the target prefabrication curvature of the upper surface of the lining plate blank in the target prefabrication direction according to the target prefabrication position and the target prefabrication radius; the target prefabrication direction is the direction of curvature prefabrication from the edge of the lining plate blank to the middle along the transverse direction of the lining plate blank; based on the target prefabrication curvature and the target prefabrication direction, performing curvature prefabrication on the upper surface of the lining plate blank to obtain the target lining plate; Stacking the target substrate and the target cover plate to obtain a first composite blank; Based on the target liner and the first composite blank, a first rolled piece is manufactured; Rolling the first rolled piece to obtain a second rolled piece; The liner on the second rolled piece is peeled off to obtain a bimetallic composite plate.

2. A method for rolling a bimetallic composite plate according to claim 1, characterized in that: The method of using finite element analysis software to determine a target prefabrication position and a target prefabrication radius acting on the upper surface of the liner blank includes: Based on the sizes of the target substrate, the target cover plate and the lining plate blank, a finite element analysis software is used to obtain a simulated target substrate, a simulated target cover plate and a simulated lining plate blank; The simulation target substrate and the simulation target cover plate are stacked and assembled to obtain a third composite blank; Extracting a first principal stress data set of the third composite blank; the first principal stress data set is a set of radial principal stresses at a bimetallic bonding interface on a rolling neutral plane of the third composite blank; Based on the first principal stress data set, drawing a first principal stress distribution curve; According to the position where the compressive stress in the first principal stress distribution curve starts to decrease, setting a preset position and a preset radius of the prefabricated arc acting on the simulated liner blank; Manufacturing a first prefabricated lining plate according to a preset position and a preset radius; Based on the first prefabricated liner and the third composite blank, a third rolled piece is manufactured; Extracting a second principal stress data set of the third rolled piece; the second principal stress data set is a set of radial principal stresses at a bimetallic bonding interface on a rolling neutral plane of the third rolled piece; Based on the second principal stress data set, drawing a second principal stress distribution curve; Based on the first principal stress distribution curve and the second principal stress distribution curve, a target prefabrication position and a target prefabrication radius acting on the upper surface of the liner blank are determined.

3. A method for rolling a bimetallic composite plate as claimed in claim 2, characterized in that: The determining of a target prefabrication position and a target prefabrication radius acting on the upper surface of the liner blank based on the first principal stress distribution curve and the second principal stress distribution curve comprises: Based on the first principal stress distribution curve, a first target principal stress point is determined; the first target principal stress point is a coordinate point at which the compressive stress at the edge of the bimetallic composite plate represented by the first principal stress distribution curve begins to decrease; Based on the second principal stress distribution curve, a second target principal stress point is determined; the second target principal stress point is a coordinate point at which the compressive stress at the edge of the bimetallic composite plate represented by the second principal stress distribution curve begins to decrease; Determine, according to the coordinate data corresponding to the second target principal stress point, the actual distance between the initial drop point of the principal stress at the interface of the bimetallic composite plate on the rolling neutral plane of the third rolled piece and the edges on both sides of the bimetallic composite plate; If the actual distance is less than or equal to the target distance, the preset position and preset radius corresponding to the first prefabricated lining plate are determined as the target prefabrication position and target prefabrication radius acting on the lining plate blank; If the actual distance is greater than the target distance, the thickness, prefabricated arc radius and prefabricated arc position of the lining plate blank are adjusted to produce a second prefabricated lining plate; based on the second prefabricated lining plate and the third composite blank, a fourth rolled part that meets the requirements is produced; the actual distance between the initial drop point of the principal stress at the bonding interface of the bimetallic composite plate on the rolling neutral plane of the fourth rolled part and the edges of both sides of the bimetallic composite plate is less than or equal to the target distance.

4. A method for rolling a bimetallic composite plate according to claim 1, characterized in that: The method of manufacturing a first rolled piece based on the target liner and the first composite blank comprises: Heating the first composite blank according to a preset temperature to obtain a second composite blank; The first rolled piece is manufactured based on the target liner and the second composite billet.

5. A method for rolling a bimetallic composite plate as claimed in claim 4, characterized in that: The step of manufacturing the first rolled piece based on the target liner and the second composite blank comprises: Evenly applying an isolation material on the lower surface of the target liner to obtain a prefabricated target liner; The prefabricated target liner is stacked on the second composite billet and transferred to a rolling mill for rolling to obtain the first rolled piece.

6. A method for rolling a bimetallic composite plate according to claim 1, characterized in that: The stacking and assembling of the target substrate and the target cover plate comprises: The surfaces to be composited of the target substrate and the target liner are pretreated; the pretreatment includes at least one or more of sandblasting, pickling, machining and cleaning.

7. A method for rolling a bimetallic composite plate according to claim 1, characterized in that: The hardness of the target substrate is greater than or equal to the hardness of the target cover plate, and the hardness of the target backing plate is greater than the hardness of the target substrate; The target liner thickness is 0.1 to 2 times the target substrate thickness, and the target prefabricated arc radius is 0.1 to 5 times the target substrate thickness.

8. A rolling equipment for a bimetallic composite plate, characterized in that: The rolling equipment includes a providing unit, a billet assembly unit, a manufacturing unit, a rolling unit and a stripping unit; The providing unit is used to provide a target substrate, a target cover plate and a target lining plate; the target substrate and the target cover plate have the same length and width; the target substrate and the target cover plate are made of different metal materials; the target lining plate is a lining plate with a target prefabricated curvature made based on a lining plate blank having the same length and width as the target substrate; before providing the target lining plate, it includes: obtaining the dimensions of the target substrate and the target cover plate; using finite element analysis software to determine the target prefabrication position and target prefabrication radius acting on the upper surface of the lining plate blank ; Based on the target prefabrication position and the target prefabrication radius, the lining blank is prefabricated in an arc to obtain the target lining, including: determining a target prefabrication arc for the upper surface of the lining blank in a target prefabrication direction according to the target prefabrication position and the target prefabrication radius; the target prefabrication direction is a direction for prefabricating the arc from the edge of the lining blank to the middle along the lateral direction of the lining blank; based on the target prefabrication arc and the target prefabrication direction, the upper surface of the lining blank is prefabricated in an arc to obtain the target lining; The assembly unit is used to stack and assemble the target substrate and the target cover plate to obtain a first composite blank; The manufacturing unit is used to manufacture a first rolled piece based on the target liner and the first composite blank; The rolling unit is used to perform rolling processing on the first rolled piece to obtain a second rolled piece; The stripping unit is used to strip the liner from the second rolled piece to obtain a bimetallic composite plate.

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