A composite strip rolling and press forming apparatus and a composite strip rolling and press forming method

Abstract

The application discloses a composite strip rolling and stamping forming equipment and a composite strip rolling and stamping method, and relates to the rolling technical field.The equipment comprises unwinding devices, pulse current heating devices, rolling composite devices, strip buffering devices, annealing and straightening devices, stamping forming devices and winding devices which are arranged in sequence along the conveying direction of the strip.The unwinding devices release metal strips;the current heating components of the pulse current heat the metal strips;the rolling composite devices roll multiple metal strips into metal composite strips;the strip buffering devices perform buffering and conveying;the annealing and straightening devices perform annealing and straightening treatment;the stamping forming devices perform stamping and edge cutting;and the winding devices perform winding.The current heating components can precisely heat each metal strip to high temperature, improve the electrical plasticity of the strip, improve the interface bonding strength of the copper-steel metal strip, effectively improve the edge rebound and wrinkling of the stamping product through the electrical plasticity, and improve the product quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rolling technology, in particular to a composite strip rolling and stamping forming equipment and a composite strip rolling and stamping method. BACKGROUND

[0002] The copper-steel composite strip is a bimetallic material formed by combining copper layer and steel layer through rolling force by rolling process, which has excellent performance of both copper and steel. In the prior art, copper-steel strip is preliminarily combined by cold rolling through a rolling mill, and then composite strip is obtained by long time high temperature annealing. Although this method effectively improves the uneven distribution of residual stress of the composite strip after rolling, the metallurgical bonding capacity of copper-steel metal strip is weak, and only mechanical bonding can be achieved by the rolling force generated by cold rolling, so the bonding interface strength is low. The composite strip is then separately transferred to a stamping machine for stamping and edge cutting to cut the uneven width of the strip after rolling into a metal composite strip with consistent width and neat edges. However, due to the low bonding interface strength of the composite strip, during the stamping and edge cutting process, the shear force exists between the layers due to the mismatch of the deformation coordination of different materials of the composite strip, resulting in interlayer cracking. In addition, due to the need for long time high temperature annealing, the composite strip needs to stay in the annealing station for a long time, so that after completing the annealing process, the composite strip is separately transported to other processes such as stamping process, and then the stamping process is separately completed. Therefore, the rolling, annealing and stamping processes of the strip cannot be effectively connected, and the production efficiency is low. SUMMARY

[0003] The purpose of the present application is to provide a composite strip rolling and stamping forming equipment and a composite strip rolling and stamping method, which can improve the metallurgical bonding strength of copper-steel metal strip and realize the coordinated and efficient continuous production of rolling, straightening and stamping.

[0004] In order to achieve the above purpose, the present application provides the following technical scheme:

[0005] In a first aspect, the present application provides a composite strip rolling and stamping forming equipment, comprising: unwinding devices, pulse current heating devices, rolling and combining devices, strip buffering devices, annealing and straightening devices, stamping forming devices and winding devices arranged in sequence along the conveying direction of the strip.

[0006] The unwinding device is used to unwind a plurality of different metal strips.

[0007] The pulse current heating device comprises a plurality of current heating components, each of which is used to electrify and heat a corresponding metal strip.

[0008] The rolling and combining device comprises a roller assembly, which is used to roll and combine a plurality of metal strips to form a metal composite strip.

[0009] The strip buffering device is used for buffering the metal composite strip in conveying;

[0010] The annealing and straightening device is used for annealing and straightening the metal composite strip;

[0011] The stamping forming device is used for stamping and trimming the metal composite strip to obtain the metal composite strip with the same width and neat edges;

[0012] The winding device is used for winding the metal composite strip after stamping.

[0013] Optionally, in the composite strip rolling and stamping forming equipment, the electric current heating assembly comprises an electric chute, a conductive sheet, a pulse power source, a conductive column and an electric brush, the electric chute is a cavity structure with a receiving cavity, the electric chute extends along the metal strip conveying direction, and an input port and an output port connected with the cavities are respectively arranged at two ends of the electric chute, the metal strip enters the cavity of the electric chute through the input port, and the metal strip is output through the output port.

[0014] The conductive sheet is arranged on the two side walls of the electric chute, one end of the conductive sheet penetrates into the electric chute, and the other end of the conductive sheet is used for being connected with the pulse power source, so that the conductive sheet is electrically connected with the metal strip in the electric chute.

[0015] The pulse power source is connected with the conductive column through the electric brush, and the conductive column is electrically connected with the conductive sheet.

[0016] Optionally, in the composite strip rolling and stamping forming equipment, the pulse current heating device further comprises a connecting rod assembly arranged between two adjacent electric chutes, the connecting rod assembly comprises a first connecting rod and a second connecting rod which are hingedly connected with each other, one end of the first connecting rod is hingedly connected with one of the two adjacent electric chutes, and one end of the second connecting rod is hingedly connected with the other of the two adjacent electric chutes.

[0017] Optionally, in the composite strip rolling and stamping forming equipment, the pulse current heating device further comprises a spring assembly arranged between two adjacent electric chutes, the spring assembly comprises a support spring and an end cap, and two ends of the support spring are respectively installed on the outer wall surfaces of the two adjacent electric chutes through the end caps.

[0018] Optionally, in the composite strip rolling and stamping forming device, the pulse current heating device comprises two groups of the current heating assemblies, the extension length of one of the electric grooves of the two groups of the current heating assemblies is greater than the extension length of the other electric groove, and the output ports of the two electric grooves are aligned.

[0019] Optionally, in the composite strip rolling and stamping forming device, the strip buffering device comprises a box, an inlet positioning roller, an outlet positioning roller and a supporting roller, the box is a cavity structure with a containing cavity, the box extends along the conveying direction of the metal composite strip, a strip inlet is formed at one end of the box close to the rolling composite device, a strip outlet is formed at the other end of the box, and the strip inlet and the strip outlet are both connected with the inner cavity of the box.

[0020] The inlet positioning roller is arranged at the strip inlet, the outlet positioning roller is arranged at the strip outlet, and a plurality of the supporting rollers are arranged between the inlet positioning roller and the outlet positioning roller along the direction from the strip inlet to the strip outlet.

[0021] Optionally, in the composite strip rolling and stamping forming device, the annealing and straightening device comprises an upper pressing plate, a lower pressing plate, an electric heating wire, a pressing wheel, a nitrogen gas nozzle and a driving assembly.

[0022] The upper pressing plate is located above the lower pressing plate, the upper pressing plate is driven to move towards the lower pressing plate by the driving assembly, recesses are formed on the opposite surfaces of the upper pressing plate and the lower pressing plate, the two recesses are matched to form a containing cavity for accommodating the metal composite strip when the upper pressing plate and the lower pressing plate are in close contact, and the groove bottom of at least one of the recesses is paved with a plurality of the electric heating wires.

[0023] The two side edges of the upper pressing plate and the two side edges of the lower pressing plate are both provided with a plurality of the pressing wheels, each of the pressing wheels is distributed at intervals along the conveying direction of the metal composite strip, and the pressing wheels of the upper pressing plate and the pressing wheels of the lower pressing plate are arranged in a staggered manner, and the pressing wheels are used for pressing the edges of the metal composite strip.

[0024] The nitrogen gas nozzle is arranged on the upper pressing plate, the upper pressing plate is provided with a gas injection channel communicated with the recess, and the nitrogen gas nozzle sprays nitrogen gas into the recess through the gas injection channel.

[0025] Optionally, in the composite strip rolling and stamping forming device, the stamping forming device comprises a die guide groove and a stamping head, and the die guide groove extends along the conveying direction of the metal composite strip, and the metal composite strip is stamped and trimmed by being pressed into the die guide groove by the stamping head.

[0026] In a second aspect, the present application provides a composite strip rolling and punching forming method for rolling and punching forming a steel strip and a copper strip into a composite strip by the strip rolling and punching forming device according to any one of the above, the composite strip rolling and punching forming method comprising:

[0027] releasing the steel strip and the copper strip by a releasing device;

[0028] feeding the steel strip and the copper strip into two current heating components of the pulse current heating device respectively, and electrifying the steel strip and the copper strip in each current heating component to heat, wherein the transmission speed of the steel strip and the copper strip is the same, the electrifying time of the steel strip is greater than that of the copper strip, and the frequency of the pulse current of the two current heating components is adjusted according to the thickness of the steel strip and the copper strip;

[0029] feeding the steel strip and the copper strip into the rolling composite device to roll and obtain a metal composite strip;

[0030] feeding the metal composite strip into the annealing and straightening device after buffering by the strip buffering device to anneal and straighten;

[0031] feeding the straightened metal composite strip into the punching forming device to punch and cut edges to obtain the metal composite strip with the same width and neat edges;

[0032] winding the punched metal composite strip by a winding device.

[0033] Optionally, in the composite strip rolling and punching forming method, the adjusting the frequency of the pulse current of the two current heating components according to the thickness of the steel strip and the copper strip comprises: obtaining the frequency of the pulse current of the current heating component according to the thickness of the steel strip and the copper strip and formula one, the formula one is: ;

[0034] wherein, is the skin depth, is the current frequency, is the magnetic permeability, is the electrical conductivity, is the resistivity, is the angular frequency.

[0035] The composite strip rolling and punching forming device and the composite strip rolling and punching forming method provided by the present application have the following beneficial effects:

[0036] The composite strip rolling and stamping forming device provided by the present application comprises a plurality of different metal strips, and each metal strip is heated by a current heating assembly in a pulse current heating device before being rolled into a metal composite strip, and only one current heating assembly is used to heat one metal strip, so that each metal strip reaches a high temperature before being rolled by a rolling composite device through a rolling roller, and then the metal composite strip is formed by rolling, and then the metal composite strip is buffered by a strip buffering device and then conveyed to an annealing and straightening device for annealing and straightening treatment, and finally the annealed and straightened metal composite strip enters a stamping forming device for stamping and edge cutting, so that a metal composite strip with uniform width and neat edges is finally prepared. In the whole process, the plurality of different metal strips are continuously unwound by an unwinding device, and the metal composite strip after stamping and edge cutting is continuously wound by a winding device. Compared with the prior art, the strip rolling and stamping forming device provided by the present application can accurately adjust the power-on time and power-on amount of the corresponding current heating assembly for each metal strip with different materials, thicknesses and other parameters, so as to perform appropriate power-on heating, accurately power-on heat each metal strip to a high temperature, improve the electrical plasticity of the strip, simplify the production process and process complexity, improve the interfacial bonding strength of the copper-steel metal strip and the synergistic deformation capability, thereby improving the interfacial bonding strength and the interlayer cracking problem caused by the mismatch of metal layer deformation coordination in the stamping process, effectively improving the edge springback and wrinkling of the stamping product by the electrical plasticity, improving the product quality, and the composite strip rolling and stamping forming device provided by the present application integrates rolling, annealing, straightening and stamping. Since the pulse current heating device can power-on heat the metal strip and improve the bonding performance of the strip joint, the annealing time can be shortened, and the annealing and straightening are performed synchronously, thereby simplifying the production process and process complexity, reducing the production cost and time, and continuously conveying the strip by the unwinding device and the winding device during the whole rolling, annealing, straightening and stamping process. The metal composite strip is buffered by the strip buffering device, so that the metal composite strip with faster rolling progress is partially accumulated in the strip buffering device to buffer the conveying progress, adapt to the progress of the subsequent annealing and straightening process, avoid the strip drawing and breakage caused by the mismatch of production speed, realize the coordination of multiple processes, ensure the continuous production of the production line, and improve the smoothness of the production process and the efficiency of the production.

[0037] The composite strip rolling and stamping forming method provided by the present application has all the technical effects of the above-mentioned strip rolling and stamping forming device, and will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0039] Figure 1 Structure diagram of the rolling and stamping forming equipment for the composite strip disclosed by the embodiment of the application;

[0040] Figure 2 Structure diagram of the current heating assembly disclosed by the embodiment of the application;

[0041] Figure 3 Schematic diagram of the current flow disclosed by the embodiment of the application;

[0042] Figure 4 Structure diagram of the rolling composite device disclosed by the embodiment of the application;

[0043] Figure 5 Structure diagram of the annealing and straightening device disclosed by the embodiment of the application;

[0044] Figure 6 Structure diagram of the edge roller in the annealing and straightening device disclosed by the embodiment of the application;

[0045] Figure 7 Structure diagram of the stamping forming device disclosed by the embodiment of the application;

[0046] Figure 8 Temperature rise diagram of the strip under the action of the pulse current disclosed by the embodiment of the application;

[0047] Figure 9 Simulation diagram of the copper-steel composite strip bulging test disclosed by the embodiment of the application;

[0048] Figure 10 Physical diagram of the copper-steel composite strip bulging test disclosed by the embodiment of the application.

[0049] Reference signs:

[0050] 100 is the current heating assembly, 110 is the electric chute, 120 is the conductive sheet, 130 is the conductive column, 140 is the brush, 150 is the pulse power supply, 160 is the connecting rod assembly, 170 is the supporting spring, and 180 is the end cap;

[0051] 200 is the rolling composite device, 210 is the upper roller, and 220 is the lower roller;

[0052] 300 is the strip buffering device, 310 is the box body, 320 is the inlet positioning roller, 330 is the outlet positioning roller, and 340 is the supporting roller;

[0053] 400 is an annealing straightening device, 410 is an upper pressing plate, 420 is a lower pressing plate, 430 is an electric heating wire, 440 is a pressing wheel, 450 is a nitrogen jet head, 460 is a telescopic column, 470 is a hydraulic cylinder, and 480 is an electric control box;

[0054] 500 is a punch forming device, 510 is a mold guide groove, and 520 is a punch head;

[0055] 600 is an uncoiler;

[0056] 700 is a coiler. DETAILED DESCRIPTION

[0057] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0058] 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.

[0059] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited. The meaning of "several" is one or more, unless otherwise explicitly and specifically limited.

[0060] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, and are only used for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application.

[0061] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] As shown in Figure 1 and Figure 4 , the embodiment of the present application discloses a strip rolling stamping forming device, which comprises unwinding device, pulse current heating device, rolling composite device 200, strip buffering device 300, annealing straightening device 400, stamping forming device 500 and winding device arranged in turn along the conveying direction of the strip. Among them, the metal strip conveyed out from the unwinder 600 of the unwinding device is first conveyed to the current heating assembly 100 in the pulse current heating device, and the metal strip is heated by the current heating assembly 100 before rolling to make the metal strip quickly heat up to a high temperature state, and the current heating assembly 100 is provided with multiple groups, and a group of current heating assembly 100 heats the current passing through the corresponding metal strip to ensure that the current passing through each metal strip is accurately heated, and then the metal strip reaching high temperature through the current heating assembly 100 is conveyed to the rolling composite device 200, the roller assembly in the rolling composite device 200 includes upper roller 210 and lower roller 220, the upper roller 210 is located above the lower roller 220, and a gap is left between the upper roller 210 and the lower roller 220 to make the metal strip pass through, after multiple metal strips in high temperature state enter between the upper roller 210 and the lower roller, the rolling roller applies pressure to the metal strip, and then each metal strip is rolled into a metal composite strip, in addition, the roller can be made of high-temperature-resistant and insulating ceramic material to prevent safety hazards during power-on, the metal composite strip output from the rolling composite device 200 is conveyed to the strip buffering device 300, the metal composite strip is buffered in the strip buffering device 300 and then continuously conveyed to the annealing straightening device 400, the metal composite strip is annealed and straightened in the annealing straightening device 400, and finally the annealed and straightened metal composite strip enters the stamping forming device 500 for stamping and edge cutting to prepare a metal composite strip with the same width size and neat edges, and finally the metal composite strip after stamping and edge cutting is wound and arranged by the winding machine 700 of the winding device.

[0063] The strip rolling stamping forming device provided by the embodiment can realize precise electric heating of each metal strip to high temperature by adjusting the energization time and the energization amount of the current heating assembly, and the metal strips with different materials, thicknesses and other parameters are appropriately electrically heated, thereby improving the electrical plasticity of the strip, simplifying the production process and the process complexity, improving the interfacial bonding strength of the copper-steel metal strip and the synergistic deformation capacity, and thereby improving the interfacial bonding strength and the interlayer cracking problem caused by the mismatch of the deformation of the metal layers during the stamping process, the metal composite strip bulging experiment generates bidirectional tensile deformation of the strip through internal pressure (such as hydraulic bulging or mechanical bulging), and by controlling the bulging amount, the deformation rate and other parameters, the critical deformation condition during stamping can be simulated, and whether the interlayer delamination occurs can be observed, so as to directly verify whether the delamination is caused by uneven stress distribution or insufficient interlayer bonding, such as the copper-steel composite strip bulging test simulation diagram shown in Figure 9 As shown in Figure 10 The copper-steel composite strip bulging test simulation diagram of the strip rolling stamping forming device provided by the embodiment can be seen, and the copper-steel composite strip prepared by the strip rolling stamping forming device provided by the embodiment satisfies the stamping requirement of the surface bonding strength of the copper-steel composite strip, and prevents the problem of obvious delamination of the edge of the strip during the stamping and cutting process, effectively improves the springback and wrinkling of the edge of the stamping product, and improves the product quality, and the composite strip rolling stamping forming device provided by the embodiment integrates rolling, annealing, straightening and stamping, simplifies the production process and the process complexity, reduces the production cost and time, and the metal composite strip is buffered by the strip buffering device during the whole rolling, annealing, straightening and stamping process, realizes the coordination of multiple processes, ensures the continuous production of the production line, and improves the smoothness of the production process and the efficiency of the production.

[0064] As shown in Figure 2 and Figure 3As shown, in a specific embodiment, the current heating assembly 100 comprises an electric chute 110, a conductive sheet 120, a pulse power supply 150, a conductive column 130 and a brush 140, the electric chute 110 is a cavity structure with a receiving cavity, the receiving cavity of the electric chute 110 extends along the conveying direction of the metal strip, and the two ends of the electric chute 110 are respectively provided with an input port and an output port, both of which are in communication with the cavity of the electric chute 110, and the metal strip enters the cavity of the electric chute 110 through the input port and then is output through the output port. At the same time, a plurality of conductive sheets 120 are arranged on the two side walls of the electric chute 110, the number of conductive sheets 120 arranged on the two side walls is the same and one-to-one correspondence, and each conductive sheet 120 is arranged in the extension direction of the electric chute 110, wherein each conductive sheet 120 located on the same side wall is connected in series, one end of the conductive sheet 120 penetrates the side wall of the electric chute 110 and extends into the cavity of the electric chute 110, so that the conductive sheet 120 can be attached to the metal strip conveyed into the electric chute 110, and the other end of the conductive sheet 120 is connected with the pulse power supply 150, thereby guiding the current into the metal strip in the electric chute 110 through the conductive sheet 120 attached to the metal strip. In order to improve the safety performance of the equipment, the electric chute 110 is made of insulating material to reduce the risk of accidental electric shock. The pulse power supply 150 is electrically connected to the brush 140 through a wire, the brush 140 is clamped and fixed on the circumferential surface of the conductive column 130, and one end of the conductive column 130 is connected and fixed with one conductive sheet 120 arranged on the side wall of the electric chute 110. In this way, the negative electrode of the pulse power supply 150 is electrically connected to one conductive sheet 120 located in one side of the electric chute 110 through the brush 140 and the conductive column 130, and the positive electrode of the pulse power supply 150 is electrically connected to one conductive sheet 120 located in the other side of the electric chute 110 through the brush 140 and the conductive column 130, and each conductive sheet 120 located on the same side wall is connected in series, so that each conductive sheet 120 can simultaneously conduct electricity to the metal strip in the electric chute 110. The plurality of conductive sheets 120 arranged on the electric chute 110 not only provide uniform current for the moving metal strip, but also ensure that the current passes through different positions of the moving metal strip, so that the current can be accumulated on the metal strip, improving the heating efficiency of the metal strip and ensuring that the metal strip is rapidly heated to a high temperature state in a short time.

[0065] In a specific embodiment, the pulse current heating device is further provided with a linkage assembly 160, the linkage assembly 160 comprises a first linkage and a second linkage, the end of the first linkage is hingedly connected with the end of the second linkage, the other end of the first linkage is hingedly connected with one of the adjacent two electric grooves 110, and the other end of the second linkage is hingedly connected with the other of the adjacent two electric grooves 110, and the first linkage and the second linkage are hingedly connected with the side wall of the electric groove 110, the linkage assembly 160 can adjust the inclination angle of the adjacent two electric grooves 110, so that the metal strip output from the electric groove 110 can adapt to the entrance angle of the roller assembly, which improves the smoothness of the metal strip conveying into the roller assembly. In addition, in order to improve the stability of the included angle between the adjacent two electric grooves 110, the linkage assembly 160 can be provided in multiple groups, and each linkage assembly 160 is spaced along the extension direction of the electric groove 110. In this embodiment, the linkage assembly 160 is provided with two groups, one of which is close to the input port of the electric groove 110, and the other is close to the output port of the electric groove 110.

[0066] As shown in Figure 2 some specific embodiments, the pulse current heating device provided by the present embodiment is further provided with a spring assembly arranged between the adjacent two electric grooves 110. The spring assembly comprises a supporting spring 170 and an end cap 180. One end of the end cap 180 is a flat surface for abutting with the outer wall of the electric groove 110. The end cap 180 is provided with a receiving cavity for the end of the supporting spring 170 to extend into. Thus, the two ends of the supporting spring 170 are connected to the corresponding outer walls of the adjacent two electric grooves 110 through the end cap 180. Through the spring assembly, the electric groove 110 above is not only supported, but also the spring assembly with elastic extension and contraction can adaptively adjust the spacing between the adjacent two electric grooves 110 during the adjustment of the included angle between the adjacent two electric grooves 110 by the linkage assembly 160, thereby stably providing support.

[0067] As shown in Figure 2 and Figure 8 In a specific embodiment, the pulse current heating device in the strip rolling and stamping forming device provided by the present embodiment is provided with two groups of current heating assemblies 100. In the two groups of current heating assemblies 100, the extension length of the electric groove 110 in one group of current heating assemblies 100 is greater than that of the electric groove 110 in the other group of current heating assemblies 100. During assembly, the output ports of the two electric grooves 110 need to be aligned. When rolling the copper strip and the steel strip into a metal composite strip, the steel strip is conveyed into the electric groove 110 with longer extension length, and the copper strip is conveyed into the electric groove 110 with shorter extension length, so that the current heating time of the steel strip is greater than that of the copper strip, thereby ensuring that the steel strip has sufficient time to heat to a high temperature state.

[0068] As Figure 1 shown, the strip buffering device 300 in the composite strip rolling and stamping forming equipment provided by the embodiment comprises a box body 310, an inlet positioning roller 320, an outlet positioning roller 330 and a supporting roller 340. The box body 310 is a cavity structure, extends along the conveying direction of the metal composite strip, and is provided with a strip inlet at one end close to the rolling composite device 200 and a strip outlet at the other end. The metal composite strip conveyed out of the rolling composite device 200 enters the cavity of the box body 310 through the strip inlet and is then conveyed out of the box body 310 through the strip outlet. The inlet positioning roller 320 in the strip buffering device 300 is arranged at the strip inlet, the outlet positioning roller 330 is arranged at the strip outlet, and the supporting roller 340 is arranged between the inlet positioning roller 320 and the outlet positioning roller 330. The number of the supporting rollers 340 is multiple, and each supporting roller 340 is arranged at intervals along the direction from the inlet positioning roller 320 to the outlet positioning roller 330. Therefore, during the process of the metal composite strip entering the strip buffering device 300, the outlet positioning roller 330 arranged at the strip outlet first corrects the position of the metal composite strip to avoid large position deviation of the metal composite strip entering the strip buffering device 300. After the metal composite strip is conveyed to the supporting rollers 340, the metal composite strip will form accumulation between the supporting rollers 340 under the action of gravity. The metal composite strip forms an accumulated state, which plays a buffering role for the next process, balances the production rhythm difference between the rolling composite device 200 and the stamping machine, and avoids strip drawing and strip breaking caused by the mismatch of production speed. When the metal composite strip is conveyed out of the strip buffering device 300, the outlet positioning roller 330 arranged at the strip outlet further corrects the position of the conveyed metal composite strip to ensure the position accuracy of the metal composite strip entering the downstream process.

[0069] As Figure 1 , Figure 5 and Figure 6As shown, in a specific embodiment, the annealing and straightening device 400 of the composite strip rolling and stamping forming equipment provided by the present embodiment comprises an upper pressing plate 410, a lower pressing plate 420, electric heating wires 430, edge pressing wheels 440, nitrogen gas nozzles 450 and a driving assembly, wherein the upper pressing plate 410 is located above the lower pressing plate 420, the upper pressing plate 410 is driven to move towards the lower pressing plate 420 by the driving assembly, and the opposite two sides of the upper pressing plate 410 and the lower pressing plate 420 are both provided with grooves, and the two ends of the grooves are both provided with openings, so that after the upper pressing plate 410 and the lower pressing plate 420 are attached, the grooves of the upper pressing plate 410 and the grooves of the lower pressing plate 420 cooperate to form a cavity for accommodating the metal composite strip, and the groove bottoms of at least one groove are paved with a plurality of electric heating wires 430, and each electric heating wire 430 is distributed along the conveying direction of the metal composite strip, and the electric heating wires 430 are controlled by the electric control box 480 to heat and anneal the metal composite strip between the upper pressing plate 410 and the lower pressing plate 420, and the nitrogen gas nozzles arranged on the upper pressing plate 410 can fill the cavity with nitrogen through the jetting channels communicated with the grooves to prevent the oxidation of the composite strip during the annealing process and improve the surface quality of the product. And the two side edges of the upper pressing plate 410 and the two side edges of the lower pressing plate 420 of the annealing and straightening device 400 are both provided with a plurality of edge pressing wheels 440, and each edge pressing wheel 440 is distributed along the conveying direction of the metal composite strip, and the edge pressing wheels 440 of the upper pressing plate 410 correspond to the edge pressing wheels 440 of the lower pressing plate 420 in staggered arrangement, and the edge pressing wheels 440 are pressed on the edges of the metal composite strip, which limits the longitudinal movement of the metal composite strip and also eliminates the internal residual stress of the metal composite strip after rolling in combination with the annealing temperature, thereby playing a straightening role. In a specific embodiment, when the steel strip and the copper strip are rolled into a metal composite strip and then enter the annealing and straightening device 400 for annealing treatment, the annealing temperature is 600-650°C, which can significantly improve the plasticity of the copper-steel composite strip, eliminate the residual stress of the strip after rolling, and reduce the material deformation resistance during stamping.

[0070] In a specific embodiment, the driving assembly includes a telescopic column 460 and a hydraulic cylinder 470, the telescopic column 460 includes a telescopic column body nested in a sleeve, and the column body is movable up and down along the axis of the telescopic column 460 for telescoping, the upper pressing plate 410 and the lower pressing plate 420 are connected by the telescopic column 460, wherein the upper pressing plate 410 is connected with the telescopic column body of the telescopic column 460, the lower pressing plate 420 is connected with the relatively fixed sleeve, and the telescopic column 460 is connected with the hydraulic cylinder 470, and then the telescopic column 460 is driven to extend or contract by the hydraulic cylinder 470, so as to realize the movement or away of the upper pressing plate 410 to the lower pressing plate 420, and in addition, the telescoping length of the telescopic column 460 can be set by adjusting the telescopic column 460, so that the annealing and straightening device 400 can anneal and straighten the metal composite strip of different thicknesses. The telescopic column 460 provided in the embodiment is provided in plurality, each telescopic column 460 is distributed on both sides of the upper pressing plate 410 and the lower pressing plate 420 and corresponds one by one, and one telescopic column 460 is connected with one hydraulic cylinder 470, so that each telescopic column 460 can move independently, and the stability of the connection of the upper pressing plate 410 and the lower pressing plate 420 is improved, and the stability of the movement of the upper pressing plate 410 is also improved.

[0071] As shown in Figure 1 and Figure 7 In a specific embodiment, the stamping and forming device 500 in the composite strip rolling and stamping and forming equipment provided in the present example includes a die guide groove 510 and a stamping head 520, the die guide groove 510 extends along the conveying direction of the metal composite strip, the die guide groove 510 is a groove structure matched with the stamping head 520, after the annealing and straightening treatment of the metal composite strip in the annealing and straightening device 400 is completed, the metal composite strip is conveyed into the die guide groove 510 of the stamping and forming device 500, then the stamping head 520 moves to the die guide groove 510, and the metal composite strip is stamped and trimmed by the stamping head 520 pressed into the die guide groove 510, so as to prepare the metal composite strip with consistent width and neat edges. Since the current heating assembly 100 precisely heats the steel strip and the copper strip respectively, the copper / steel composite strip interface bonding strength and the synergistic deformation ability are improved, the interface bonding strength is low and the metal layer deformation is not matched during stamping, which causes the interlayer cracking problem to be improved, and the stamping product edge wrinkling phenomenon is effectively improved by the electroplasticity, the product quality is improved, in addition, the die guide groove 510 adopts a ceramic material which is high-temperature resistant and insulating, so as to prevent safety hazards during electrification, and finally the remaining material is wound and recycled by the winding machine 700.

[0072] The strip rolling and stamping forming device provided by the embodiment integrates the precise current heating of the current heating assembly 100 on each metal strip, the rolling and composite device 200 for rolling into a composite strip, then the gravity buffering of the strip buffering device 300, the rapid annealing of the annealing and straightening device 400, and finally the stamping and edge cutting of the stamping and forming device 500, compared with the long process of the prior art of “cold rolling→cooling→long-time annealing→stamping”, and “overall current application→rolling→cooling→stamping”, the energy consumption is reduced by 40%, the production cycle is shortened by 50%, and the material electroplasticity is significantly improved, and the interface bonding strength of the copper-steel material characteristics is effectively improved to reduce the delamination phenomenon of the composite strip stamping and edge cutting.

[0073] The embodiment of the application further discloses a composite strip rolling and stamping method, which rolls and stamps the steel strip and the copper strip into a composite strip through the above-mentioned strip rolling and stamping forming device, and the composite strip rolling and stamping method provided by the embodiment comprises the following steps:

[0074] Step 01, the steel strip and the copper strip are respectively discharged through the unwinding device;

[0075] The steel strip and the copper strip should be polished by a sand belt or a steel wire brush, and the polishing mode can also be dry polishing or wet polishing, so as to remove the oxide film on the surface, reduce the influence of the oxide film on the conductivity in the current heating process, and improve the rolling bonding strength of the steel strip and the copper strip. After the surface polishing treatment is completed, the surface oil stains and impurities also need to be removed through a cleaning agent to improve the cleanliness of the surface, and then the surface-treated steel strip and copper strip are wound on the uncoiler 600 in the unwinding device for use.

[0076] Step 02, the steel strip and the copper strip are respectively input into the two current heating assemblies 100 of the pulse current heating device, each current heating assembly 100 is respectively electrified to heat the steel strip and the copper strip, wherein the transmission speed of the steel strip and the copper strip is the same, the electrification time of the steel strip is greater than that of the copper strip, and the frequency of the pulse current of the two current heating assemblies is adjusted according to the thickness of the steel strip and the copper strip;

[0077] The cleaned steel strip and copper strip are conveyed to the pulse current heating device by the uncoiler 600 at this time, the conveying speed of the steel strip and copper strip in the pulse current heating device is the same, so as to ensure that the steel strip and copper strip are synchronously heated in the pulse current heating device. However, the electrical conductivity of the copper strip is significantly greater than that of the steel strip, and the electrical plasticity effect of the steel strip is not significant, so if the copper strip is conducted for a long time, the temperature will rise sharply, causing the surface of the copper strip to oxidize and reducing the interfacial bonding strength during rolling. Specifically, the extension length of the electric chute 110 used for heating the steel strip is greater than the extension length of the electric chute 110 used for heating the copper strip, that is, the heating time of the steel strip is greater than the heating time of the copper strip, and the copper strip needs a smaller frequency pulse current to achieve precise current conduction, while the steel strip needs a larger frequency pulse current to better excite the electrical plasticity of the strip. Therefore, the above-mentioned strip rolling and stamping forming device realizes the adjustment of the current frequency and the action time for different materials with high efficiency and precision, saves electricity, reduces resource waste, and effectively improves the overall current conduction efficiency of the copper-steel composite strip. In a specific embodiment, the copper strip is heated by the pulse current for about 0.15 seconds, so that the copper strip is heated to 600°C under the action of the pulse current thermal effect for a short time, and the steel strip is heated by the pulse current for about 0.2 seconds, so that the steel strip is heated to 500°C under the action of the pulse current thermal effect for a short time. At this time, if the conveying speed of the strip is 0.6 m / s, the length of the electric chute 110 used for heating the steel strip is calculated to be 120 mm, and the length of the lower electric chute is 90 mm. At the same time, in order to realize the precise action of the pulse current on different thicknesses of metal strips, the frequency of the pulse current needs to be accurately controlled according to the thickness of the strip.

[0078] Step 03, the steel strip and copper strip are sent into the rolling composite device 200 for rolling to obtain a metal composite strip;

[0079] The copper strip and steel strip heated by the pulse current heating device are conveyed between the upper roller 210 and the lower roller 220 in the rolling composite device 200, and the copper strip and steel strip are rolled by the rotation of the upper roller 210 and the lower roller 220 to form a copper-steel composite strip.

[0080] Step 04, the metal composite strip is buffered by the strip buffering device 300 and then conveyed to the annealing and straightening device 400 for annealing and straightening;

[0081] The copper-steel composite strip rolled by the rolling composite device 200 is continuously conveyed to the strip buffering device 300, which buffers the copper-steel composite strip in conveying, plays a buffering role for the next process, avoids the strip from being pulled out or broken due to the mismatch of production speed, and the copper-steel composite strip conveyed from the strip buffering device 300 is conveyed to the annealing and straightening device 400 for annealing and straightening treatment.

[0082] Step 05, the straightened metal composite strip is conveyed to a punch forming device for punch trimming to obtain a metal composite strip with the same width and neat edges;

[0083] Finally, the copper-steel composite strip after straightening and annealing treatment enters the punch forming device 500, and the copper-steel composite strip is punched and trimmed by the mold guide groove 510 and the punch head 520 in the punch forming device 500 to prepare a metal composite strip with the same width and neat edges.

[0084] Step 06, the metal composite strip after punch trimming is wound by a winding device;

[0085] After the punch forming device 500 completes the punching, the punched metal composite strip is wound and arranged by the winding machine 700 of the winding device.

[0086] In a specific embodiment, the frequency of the pulse current of the two current heating assemblies is adjusted according to the thicknesses of the steel strip and the copper strip, including: obtaining the frequency of the pulse current of the current heating assembly according to the thicknesses of the steel strip and the copper strip and Formula I;

[0087] The skin depth can be determined by Formula I, that is, the skin depth The skin depth is the penetration depth at which the current density decays to the surface value of , so that the skin depth is approximately equal to the thickness of the strip, thereby realizing that the current penetrates the entire surface of the metal layer and improving the electroplasticity of the strip as a whole. Formula I is:

[0088] ;

[0089] wherein, is the skin depth; is the current frequency; is the magnetic permeability; is the electrical conductivity is the resistivity, is the angular frequency, and .

[0090] Specifically, taking the steel strip as an example to calculate the pulse current reaching the skin depth , the required current frequency size is determined, and the calculation process is as follows:

[0091] The steel electrical conductivity is known: ;

[0092] The steel magnetic permeability is: ;

[0093] The current frequency , it is known that the pulse current reaches the skin depth The current frequency size required to be applied when the pulse current reaches the skin depth .

[0094] The pulse current reaches the skin depth The current frequency size required to be applied, and the calculation process is as follows:

[0095] The copper conductivity is known: ;

[0096] The copper magnetic conductivity is: ;

[0097] The current frequency , the pulse current reaches the skin depth The current frequency size required to be applied is .

[0098] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0099] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A composite strip rolling press forming apparatus characterized by, The device comprises unwinding devices, pulse current heating devices, rolling composite devices, strip buffering devices, annealing and straightening devices, stamping forming devices and winding devices arranged in sequence along the conveying direction of the strip; The unwinding devices are used to unwind a plurality of different metal strips; The pulse current heating devices comprise a plurality of current heating components, each of which is used to electrify a corresponding metal strip for heating; The rolling composite devices comprise roller assemblies, through which a plurality of metal strips are rolled to form a metal composite strip; The strip buffering devices are used to buffer the metal composite strip in conveying; The annealing and straightening devices are used to anneal and straighten the metal composite strip; The stamping forming devices are used to stamp and edge the metal composite strip to obtain the metal composite strip with the same width size and neat edges; The winding devices are used to wind the stamped metal composite strip; The current heating component comprises an electric chute, a conductive sheet, a pulse power source, a conductive column and an electric brush, the electric chute is a cavity structure with a receiving cavity, the electric chute extends along the conveying direction of the corresponding metal strip, and the two ends of the electric chute are respectively provided with an input port and an output port communicating with the receiving cavity, the metal strip enters the electric chute through the input port, and the metal strip is output through the output port; The two side walls of the electric chute are arranged with the conductive sheet, one end of the conductive sheet penetrates into the electric chute, and the other end of the conductive sheet is used to connect with the pulse power source, so that the conductive sheet is electrically connected with the metal strip in the electric chute; The pulse power source is electrically connected with the conductive column through the electric brush, and the conductive column is electrically connected with the conductive sheet; The pulse current heating device comprises two groups of current heating components, the extension length of one electric chute in the two groups of current heating components is greater than that of the other electric chute, and the output ports of the two electric chutes are aligned.

2. The composite strip rolling press forming apparatus according to claim 1, characterized by The pulse current heating device further comprises a connecting rod assembly arranged between two adjacent electric chutes, the connecting rod assembly comprises a first connecting rod and a second connecting rod which are hingedly connected, and one end of the first connecting rod is hingedly connected to one of the two adjacent electric chutes, and one end of the second connecting rod is hingedly connected to the other of the two adjacent electric chutes.

3. The composite strip rolling press forming apparatus according to claim 1, wherein The pulse current heating device is further provided with a spring assembly arranged between two adjacent electric chutes, the spring assembly comprises a supporting spring and an end cap, and the two ends of the supporting spring are respectively installed on the corresponding outer wall surfaces of the two adjacent electric chutes through the end caps.

4. The composite strip rolling press forming apparatus according to claim 1, wherein The strip buffering device comprises a box body, an inlet positioning roller, an outlet positioning roller and a supporting roller, one end of the box body near the rolling composite device is provided with a strip inlet, and the other end is provided with a strip outlet, and the strip inlet and the strip outlet are in communication with the box body; The entrance positioning roller is arranged at the strip entrance, the exit positioning roller is arranged at the strip exit, and a plurality of support rollers are arranged between the entrance positioning roller and the exit positioning roller in the direction from the strip entrance to the strip exit, the support rollers are used for supporting the metal composite strip, and the intervals between adjacent support rollers are used for accommodating redundant metal composite strips.

5. The composite strip rolling press forming apparatus according to claim 1, wherein The annealing straightening device comprises an upper pressing plate, a lower pressing plate, an electric heating wire, a pressing wheel, a nitrogen gas nozzle and a driving assembly; The upper pressing plate is located above the lower pressing plate, the upper pressing plate can be driven to move towards the lower pressing plate by the driving assembly, the upper pressing plate and the lower pressing plate are both provided with grooves on opposite surfaces, the two grooves are matched to form an accommodation cavity for accommodating the metal composite strip when the upper pressing plate and the lower pressing plate are in close contact, and the groove bottom of at least one groove is paved with the electric heating wire; The two side edges of the upper pressing plate and the two side edges of the lower pressing plate are both provided with a plurality of pressing wheels, the plurality of pressing wheels are distributed at intervals along the conveying direction of the metal composite strip, and the pressing wheels of the upper pressing plate and the pressing wheels of the lower pressing plate are arranged in a staggered manner, and the pressing wheels are used for pressing the edges of the metal composite strip. The nitrogen gas nozzle is arranged on the upper pressing plate, the upper pressing plate is provided with a gas injection channel communicated with the groove, and the nitrogen gas nozzle sprays nitrogen gas into the groove through the gas injection channel.

6. The composite strip rolling press forming apparatus according to claim 1, wherein The stamping forming device comprises a die guide groove and a stamping head, and the die guide groove extends along the conveying direction of the metal composite strip, and the metal composite strip is pressed into the die guide groove by the stamping head to perform stamping and trimming on the metal composite strip.

7. A method of roll forming a composite strip, characterized by, The composite strip rolling stamping forming equipment of any one of claims 1-6, the composite strip rolling stamping method comprises: The unwinding device unwinds the steel strip and the copper strip respectively; The steel strip and the copper strip are respectively fed into two current heating assemblies of the pulse current heating device, each current heating assembly is respectively connected to the steel strip and the copper strip to heat, wherein the transmission speed of the steel strip and the copper strip is the same, the electrification time of the steel strip is greater than that of the copper strip, and the frequency of the pulse current of the two current heating assemblies is adjusted according to the thickness of the steel strip and the copper strip; The steel strip and the copper strip are sent into the rolling composite device for rolling to obtain a metal composite strip; The metal composite strip is buffered by the strip buffering device and then conveyed to the annealing straightening device for annealing and straightening; The straightened metal composite strip is conveyed to the stamping forming device for stamping and trimming to obtain the metal composite strip with the same width and neat edges; The punched metal composite strip is wound by the winding device.

8. The composite strip rolling and profiled method according to claim 7, characterized in that, According to the thickness of the steel strip and the copper strip, the frequency of the pulse current of the current heating assembly is obtained according to the thickness of the steel strip and the copper strip and formula one, The formula one is: ​ wherein, is the skin depth, is the current frequency, is the magnetic permeability, is the electrical conductivity, is the resistivity, is the angular frequency.

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