Device and method for rolling composite plate at different temperatures through current rapid gradient heating

Abstract

The invention belongs to the field of rolling processes, and particularly discloses a device and a method for rolling a composite board at different temperatures through current rapid gradient heating, the device comprises a thermal insulation box located at an inlet of a rolling mill, and a mounting frame and a double-screw-down mechanism are arranged in the thermal insulation box; the double-screw-down mechanism comprises a first screw-down mechanism fixed on the mounting frame and a second screw-down mechanism movably arranged on the mounting frame; the screw-down side translation mechanism comprises two mounting seats, two first linear guide rails are arranged between the two mounting seats, a first cylinder mounting plate slides on the first linear guide rails and is elastically connected with the mounting seat on one side, and a second screw-down mechanism is fixed below the first cylinder mounting plate and can adaptively displace along with the heated extension of a plate; the electrode system comprises two electrodes and is used for feeding pulse current to heat the plate. By accurately controlling the different temperature gradient and heat conduction, the problems of interface slippage, deformation discordance and oxidation in a traditional process are solved, the interface bonding quality, flatness and size precision of the composite board are remarkably improved, energy consumption is reduced, and production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of rolling processes, and particularly to an apparatus and method for current rapid gradient heating and non-isothermal rolling of composite plates. Background Art

[0002] Due to its excellent comprehensive properties, metal laminated composite plates have broad application prospects in many fields such as aerospace, automobile manufacturing, and ocean engineering. Its hot rolling preparation technology has always been one of the research hotspots in the field of materials processing. The traditional process generally uses a heating furnace to uniformly heat the stacked plates and then perform rolling composite. Although this process is relatively simple to operate, due to the difference in deformation resistance of dissimilar metals at the same temperature, it is extremely easy to cause interface slip and deformation incoordination phenomena.

[0003] To improve this coordination problem, researchers have proposed a non-isothermal rolling process, which differentially heats different metals to match their high-temperature deformation characteristics. However, the existing non-isothermal heating technologies still have significant defects: on the one hand, the overall heating method of conventional resistance furnaces or gas furnaces has large thermal inertia, high energy consumption, and it is difficult to precisely control the temperature gradient between dissimilar metals; on the other hand, although the newly developed pulsed current heating technology has significant Joule heating effects and fast heating rates, its sequential stacking method cannot effectively regulate the current distribution and the temperature difference between dissimilar metals, thus seriously affecting the interface bonding quality. Particularly critically, the existing technologies have not solved the problem of active regulation of non-isothermal gradients and the coordinated optimization of heat conduction, resulting in it being difficult to form an ideal metallurgical bonding state at the composite interface.

[0004] In summary, there are still many deficiencies in the existing hot rolling preparation technologies for metal laminated composite plates in non-isothermal heating, and there is an urgent need to develop an apparatus and method that can effectively overcome the above defects. Summary of the Invention

[0005] The purpose of the present invention is to provide an apparatus and method for current rapid gradient heating and non-isothermal rolling of composite plates to achieve precise regulation of non-isothermal gradients and coordinated optimization of heat conduction, thereby improving the interface bonding quality and overall performance of the composite plates.

[0006] To achieve the above purpose, in one aspect, the present invention proposes an apparatus for current rapid gradient heating and non-isothermal rolling of composite plates, including:

[0007] A heat insulation box, provided on the inlet side of the rolling mill, having a sealed cavity inside for forming an inert gas protection environment; an installation frame is fixed inside the heat insulation box;

[0008] A double pressing mechanism for pressing the plate from above, including a first pressing mechanism and a second pressing mechanism, the first pressing mechanism is fixedly connected to the installation frame, and the second pressing mechanism is movably matched with the installation frame;

[0009] The pressing-side translation mechanism includes two first mounting seats spaced apart along a line connecting the first pressing mechanism and the second pressing mechanism; the two first mounting seats are fixedly connected to a mounting frame, and two first linear guide rails are connected therebetween; a first cylinder mounting plate slides on the first linear guide rails and is elastically connected to one side of the first mounting seat; the second pressing mechanism is fixed below the first cylinder mounting plate; when the plate is heated and expanded, the second pressing mechanism pressed against the upper surface of the plate adaptively displaces accordingly;

[0010] The electrode system is used to heat the plate by passing a pulsed current, and comprises two electrodes.

[0011] The aforementioned device for rapid current gradient heating of temperature-varying rolled composite plates utilizes pulsed current as a heating method. During the heating phase, it adapts to the plate's deformation, ensuring that the plate does not warp upward in the middle and instead extends along the plate's plane.

[0012] In some optional schemes of the present invention, an electrode in the electrode system is movably connected to the mounting frame through an electrode side translation mechanism, and the electrode side translation mechanism includes a second mounting seat, a second limit member, an electrode mounting plate, a second return spring and a second linear guide rail, the two second mounting seats are fixed to the mounting frame, and the two second linear guide rails are fixed between the two second mounting seats; the electrode mounting plate slides on the second linear guide rail and is elastically connected to the second mounting seat on one side; the electrode is fixed on the electrode mounting plate and slides on the second linear guide rail with the electrode mounting plate to adapt to the expansion and deformation of the plate when heated.

[0013] In some optional schemes of the present invention, the bottoms of the first pressing mechanism and the second pressing mechanism are both connected to a position difference compensation mechanism, which includes an upper end cover, a ball, a retaining frame, a lower end cover and a moving part, and is used to compensate for the displacement deviation caused by the thickness difference between the upper and lower plates and the deviation caused by the asynchrony of displacement between the pressing side translation mechanism and the electrode side translation mechanism; the ball is limited in the retaining frame and is in rolling contact with the top of the moving part passing through the lower end cover.

[0014] In some optional solutions of the present invention, the bottom end of the moving member is connected to a pressure sensor.

[0015] In some optional solutions of the present invention, a lifting mechanism is further included, and the lifting mechanism includes a lifting platform, which drives the upper and lower plates to adjust the distance between them, and cooperates with the electrode system to achieve precise control of the temperature gradient.

[0016] In some alternative embodiments of the present invention, a first insulating plate is connected to the top of the lifting platform of the lifting mechanism, and a plurality of ceramic columns are supported on the top of the first insulating plate for supporting the plate and preventing current leakage.

[0017] In some alternative embodiments of the present invention, a first return spring is connected between the first cylinder mounting plate and the first mounting seat on one side, a first limiting member is provided between the first cylinder mounting plate and the first mounting seat on one side, and the first limiting member is in threaded cooperation with the first linear guide rail.

[0018] In some alternative embodiments of the present invention, a temperature monitoring system is further included. The temperature monitoring system includes a first temperature sensor and a second temperature sensor. The first temperature sensor is fixed on the first pressing mechanism through an upper sensor mounting plate, and the second temperature sensor is fixed on the mounting frame below the plate through a lower sensor mounting plate.

[0019] In some alternative embodiments of the present invention, a centering mechanism is further included. The centering mechanism includes two sets of positioning units. The two sets of positioning units slide towards each other on a third linear guide rail and are driven by a centering cylinder to move away from or close to each other. A synchronous linkage mechanism for driving the two to act synchronously is also connected between the two sets of positioning units. The two sets of positioning units push the plate from both sides to the centered position.

[0020] Further, the positioning unit includes a bottom support, a centering push plate, and a second insulating plate. The bottom support slides on the two third linear guide rails, and a plurality of centering push plates are fixedly connected to its upper surface. The inner side of the top of the centering push plate is fixedly connected with the second insulating plate, and the second insulating plates of the two positioning units are arranged facing each other. Among them, the centering cylinder is connected to the bottom support of one of the positioning units to drive the positioning unit to move along the third linear guide rail.

[0021] Further, a plurality of centering push plates are arranged at equal intervals along the length direction of the bottom support.

[0022] Further, the rotating mechanism includes a rotating seat fixed on the bottom plate of the heat insulation box. The rotating seat is located at the central position between the two positioning units. A synchronous three-link is rotatably connected to the rotating seat. The center of the middle link of the synchronous three-link rotates on the rotating seat, and the two ends of the middle link are respectively rotatably connected with a first link and a second link. The first link and the second link have the same length; one end of the first link away from the middle link is rotatably connected to the bottom support of one positioning unit, and one end of the second link away from the middle link is rotatably connected to the bottom support of the other positioning unit.

[0023] On the other hand, the present invention also proposes a method for current rapid gradient heating and non-isothermal rolling composite plates, using the device for current rapid gradient heating and non-isothermal rolling composite plates described in any one of the above, including the following steps:

[0024] Step S1, Material Preparation: Select the composite slab to be rolled;

[0025] Step S2, Clamping and Environment Preparation: Transfer the composite slab to the support table and place it in the center, and introduce an inert gas to construct a protective environment;

[0026] Step S3, Different Temperature Gradient Setting and Compaction Control: Adjust the distance between the upper and lower plates, and the double pressing mechanism presses the plates and monitors the compaction force;

[0027] Step S4, Pulse Current Heating and Deformation Adaptation: Pass a pulse current through the electrodes to heat the plates, monitor the temperature in real time and feedback for adjustment, and the translation mechanism adapts to the deformation of the plates;

[0028] Step S5, Rolling and Discharging: Push the heated composite plate to the rolling mill for rolling to complete the rolling of the composite plate.

[0029] Compared with the prior art, the present invention discloses at least the following beneficial effects:

[0030] The present invention provides a device for current rapid gradient heating and different temperature rolling of composite plates. By precisely controlling the different temperature gradient and heat conduction, it solves the problems of interface slip, deformation incoordination and oxidation in the traditional process, significantly improves the interface bonding quality, flatness and dimensional accuracy of the composite plates, reduces energy consumption, and improves production efficiency, having important popularization and application value. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a schematic structural diagram of a device for current rapid gradient heating and different temperature rolling of composite plates according to the present invention;

[0033] Figure 2 It is a schematic structural diagram of the double pressing mechanism in the device of the present invention;

[0034] Figure 3 It is a schematic structural diagram of the first pressing mechanism / second pressing mechanism in the device of the present invention;

[0035] Figure 4 It is a schematic structural diagram of the elevation difference compensation mechanism in the device of the present invention;

[0036] Figure 5 It is a schematic structural diagram of the translation mechanism on the pressing side in the device of the present invention;

[0037] Figure 6 This is a schematic structural diagram of the electrode side translation mechanism in the device of the present invention;

[0038] Figure 7 This is a schematic structural diagram of the lifting mechanism in the device of the present invention;

[0039] Figure 8 This is a schematic structural diagram of the centering mechanism in the device of the present invention.

[0040] In the figure: 1. Rolling mill; 2. Heat insulation box; 3. Double reduction mechanism; 31. First reduction mechanism; 32. Second reduction mechanism; 33. Upper sensor mounting plate; 301. Reduction cylinder; 302. Adjusting gasket; 303. Position difference compensation mechanism; 30301. Upper end cover; 30302. Ball; 30303. Cage; 30304. Lower end cover; 30305. Moving part; 304. Pressure sensor; 4. First temperature sensor; 5. Reduction side translation mechanism; 501. First mounting seat; 502. First limiting part; 503. First linear guide rail; 504. First slider; 505. First return spring; 506. First cylinder mounting plate; 6. Mounting frame; 7. Exhaust port; 8. Multistage oil cylinder; 9. Intake port; 10. Electrode side translation mechanism; 1001. Second mounting seat; 1002. Second limiting part; 1003. Electrode mounting plate; 1004. Second return spring; 1005. Second slider; 1006. Second linear guide rail; 11. Second temperature sensor; 12. Lifting mechanism; 1201. Ceramic column; 1202. First insulating plate; 1203. Lifting table; 13. Electrode; 14. Centering mechanism; 1401. Second cylinder mounting plate; 1402. Third linear guide rail; 1403. Third slider; 1404. Bottom support; 1405. Centering cylinder; 1406. Centering push plate; 1407. Second insulating plate; 1408. Rotary seat; 1409. Synchronous three-link rod. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] The object of the present invention is to provide a device and method for current rapid gradient heating of anisothermal rolling composite plates, aiming to effectively overcome the problems of warping of the plates during pulsed current heating and the anisothermal gradient between the two plates. Through this device and method, the plates can quickly reach the temperature required for rolling, and oxidation is prevented in the protective gas during the transportation of the plates after heating, the phenomenon of intermediate warping caused by fixing reasons is prevented during the heating process, and the anisothermal gradient between the two plates is controlled.

[0043] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Example 1

[0045] Refer to Figures 1 to 8 As shown, Example 1 of the present invention provides a device for current rapid gradient heating of anisothermal rolling composite plates, including a rolling mill 1, a heat insulation box 2, a double reduction mechanism 3, a temperature monitoring system, a deformation adaptive mechanism, an anisothermal gradient control system, a centering mechanism 14 and an electrode system.

[0046] Specifically, the rolling mill 1 is located at the end of the device and is used to perform the rolling process on the heated composite plates. The heat insulation box 2 is made of high-temperature resistant materials, and inert gas (such as argon) is introduced into the interior through the air inlet 9, and the air is discharged through the exhaust port 7 to form an inert gas protection environment. An installation frame 6 is arranged inside the heat insulation box 2, and the installation frame 6 serves as the load-bearing main body of the device, and other functional components are connected thereto. The double reduction mechanism 3 includes a first reduction mechanism 31 and a second reduction mechanism 32. The first reduction mechanism 31 is fixed at the bottom above the installation frame 6, and the second reduction mechanism 32 is movably connected to the bottom above the installation frame 6. The first reduction mechanism 31 and the second reduction mechanism 32 are respectively driven by a reduction cylinder 301 to achieve the pressing and pressure monitoring of the plates. The temperature monitoring system includes a first temperature sensor 4 and a second temperature sensor 11. The first temperature sensor 4 is fixed on the first reduction mechanism 31 through an upper sensor mounting plate 33 and synchronously rises and falls with the first reduction mechanism 31. The second temperature sensor 11 is fixed on the installation frame 6 through a lower sensor mounting plate. The two temperature sensors collect the temperature data of the upper and lower plates in real time. The deformation adaptive mechanism includes a reduction side translation mechanism 5 and an electrode side translation mechanism 10, which adapt to the thermal expansion of the plates through the cooperation of linear guides and return springs.

[0047] Both the reduction side translation mechanism 5 and the electrode side translation mechanism 10 will move with the thermal expansion of the plates. The position difference compensation mechanism 303 is used to compensate for the displacement deviation caused by the thickness difference between the upper and lower plates and the deviation caused by the asynchronous displacement between the reduction side translation mechanism 5 and the electrode side translation mechanism 10.

[0048] The variable temperature gradient control system includes a lifting mechanism 12. The lifting mechanism 12 drives the adjustment of the distance between the upper and lower plates through a lifting table 1203, and combines with the local heating characteristics of the pulsed current to achieve precise control of the temperature gradient. The centering mechanism 14 drives a push plate through a third linear guide rail 1402 and a centering cylinder 1405 to ensure that the plate is placed in the center. The electrode system consists of an electrode 13 and an electrode mounting plate 1003. The electrode mounting plate 1003 is slidably connected through a second slider 1005 and a second linear guide rail 1006 and moves synchronously with the deformation of the plate.

[0049] In the above embodiment, the heat insulation box 2 is located at the entrance of the rolling mill 1. After the plate is heated in the heat insulation box 2, it is pushed to the exit door by a multi-stage oil cylinder 8 and then enters the rolling mill 1 for rolling. An installation frame 6 is fixed in the heat insulation box 2 for installing and supporting other components, such as a double reduction mechanism 3, a lifting mechanism 12, etc.; the box body of the heat insulation box 2 is provided with an air inlet 9 and an air outlet 7. The air inlet 9 and the air outlet 7 are respectively connected to the heat insulation box 2 by threads for the inlet and outlet of gas. The heat insulation box 2 is also provided with a through hole for the multi-stage oil cylinder 8 to pass through, and the multi-stage oil cylinder 8 is fixedly installed on the box body outside the through hole; one side of the heat insulation box 2 has an entrance door and the other side has an exit door to provide a passage for the plate to enter and exit. The main function of the heat insulation box 2 is to isolate the plate during the heating process, prevent the interference of the external environment on the heating process, and at the same time protect the operators and equipment from the influence of high temperature.

[0050] In the above embodiment, as Figure 2 shown, the double reduction mechanism 3 includes a first reduction mechanism 31 and a second reduction mechanism 32. The first reduction mechanism 31 is fixed at the upper bottom of the installation frame 6 to provide a downward pressing force from a fixed position above the plate. The second reduction mechanism 32 is slidably connected to the upper bottom of the installation frame 6 along a first direction, where the first direction is the direction where the connection line of the first reduction mechanism 31 and the second reduction mechanism 32 is located. The second reduction mechanism 32 is connected to the installation frame 6 in a linear sliding manner to be able to adapt to the position movement caused by the deformation of the plate after heating.

[0051] In a specific embodiment, the structures of the first reduction mechanism 31 and the second reduction mechanism 32 are the same, as Figure 3As shown, all include a pressing cylinder 301, an adjusting shim 302, a position difference compensation mechanism 303, and a pressure sensor 304. Among them, the pressing cylinder 301 is vertically fixed below the upper cross beam of the mounting bracket 6 by bolts. The end of the cylinder push rod of the pressing cylinder 301 is connected to the position difference compensation mechanism 303 through the adjusting shim 302. The adjusting shim 302 adjusts the initial position of the position difference compensation mechanism 303 by stacking shims with different thicknesses to adapt to plates with different thicknesses. The pressure sensor 304 is connected below the position difference compensation mechanism 303, directly abuts against the upper surface of the plate, and real-time monitors the pressing force, and feeds the monitored data back to the control system to dynamically adjust the pressure of the pressing cylinder 301.

[0052] In a specific embodiment, as Figure 4 shown, the position difference compensation mechanism 303 includes an upper end cover 30301, balls 30302, a cage 30303, a lower end cover 30304, and a moving member 30305. The upper end cover 30301 is connected to the adjusting shim 302. The moving member 30305 is movably connected below the lower end cover 30304. Its top surface contacts the balls 30302, and its bottom surface is threadedly connected to the pressure sensor 304. The balls 30302 and the cage 30303 are installed between the upper end cover 30301 and the lower end cover 30304. A number of balls 30302 are arranged in an array on the cage 30303, and each ball 30302 can roll along the cage 30303 to compensate for the displacement deviation caused by the thickness difference between the upper and lower plates by reducing the friction force.

[0053] In a specific embodiment, the moving member 30305 has an upper top cover and a bottom cover, which are connected by a central cylinder between the top cover and the bottom cover. The top cover abuts against the balls 30302, and the bottom cover is fixedly connected to the pressure sensor 304. A movable hole with a diameter larger than the outer diameter of the central cylinder is opened in the middle of the lower end cover 30304, and the central cylinder freely passes through the movable hole. Due to the diameter difference between the central cylinder in the middle of the moving member 30305 and the movable hole, the position difference compensation can be achieved by reducing the friction force through the balls 30302.

[0054] In the above embodiment, the second pressing mechanism 32 is movably connected to the mounting bracket 6 through the pressing side translation mechanism 5, and thus can be far from or close to the first pressing mechanism 31 in the first direction.

[0055] In the above embodiment, as Figure 5As shown in the figure, the pressing-down side translation mechanism 5 includes a first mounting base 501, a first limiting member 502, a first linear guide rail 503, a first slider 504, a first return spring 505, and a first cylinder mounting plate 506. Among them, two first mounting bases 501 are arranged at intervals and are both fixed to the top of the mounting frame 6 by bolts. Two first linear guide rails 503 are arranged between the two first mounting bases 501. Two first sliders 504 slide on each first linear guide rail 503. The bottoms of the four first sliders 504 are fixedly connected to the first cylinder mounting plate 506. The first cylinder mounting plate 506 is used for fixedly mounting the pressing-down cylinder 301 of the second pressing-down mechanism 32. A first limiting member 502 and a first return spring 505 are respectively connected between the two first mounting bases 501 on both sides and the first slider 504 close to them. As Figure 5 shown, the first return spring 505 is sleeved on the first linear guide rail 503, and its two ends are respectively connected to the first mounting base 501 and the first slider 504, providing an elastic return force for the first cylinder mounting plate 506 to realize the automatic return function after deformation. Correspondingly, a first limiting member 502 is sleeved on the first linear guide rail 503 between the first mounting base 501 and the slider on the other side. Among them, one end of the first limiting member 502 is fixedly connected to the first mounting base 501, and the other end has an abutting surface in contact with the side surface of the slider, which is used to limit the movement range of the first cylinder mounting plate 506 along the first linear guide rail 503.

[0056] In a specific embodiment, the first limiting member 502 is in threaded cooperation with the first linear guide rail 503. When the lengths of the placed plates are different, by rotating and adjusting the threaded cooperation position of the first limiting member 502 and the first linear guide rail 503, the initial position of the pressing-down cylinder 301 is adjusted. After heating is completed, the pressing-down cylinder 301 can be returned to its original position by the first return spring 505. Since the first linear guide rail 503 needs to bear the gravity of the pressing-down cylinder 301 and the reaction force of pressing the plate in two directions, preferably, the first linear guide rail 503 uses a circular linear guide rail.

[0057] Two electrodes 13 corresponding to the positions of the first pressing-down mechanism 31 and the second pressing-down mechanism 32 are connected to the lower position of the mounting frame 6. Among them, the left electrode 13 is fixedly mounted on the mounting frame 6, and the right electrode 13 is movably connected to the mounting frame 6 through an electrode side translation mechanism 10.

[0058] In the above embodiment, the structure of the electrode side translation mechanism 10 is similar to that of the pressing-down side translation mechanism 5, and is symmetrically mounted on the mounting frame 6 below the pressing-down side translation mechanism 5, used for fixedly mounting the right electrode 13, providing a linear movement space for the right electrode 13 to adapt to the deformation of the plate. Specifically, as Figure 6As shown, the electrode side translation mechanism 10 includes a second mounting base 1001, a second limiting member 1002, an electrode mounting plate 1003, a second return spring 1004, a second slider 1005, and a second linear guide 1006. Among them, there are two second mounting bases 1001 arranged at intervals, both of which are fixed to the mounting frame 6 by bolts. Two second linear guides 1006 are fixedly connected between the two second mounting bases 1001 by bolts. Two second sliders 1005 slide on each second linear guide 1006. The tops of the four second sliders 1005 are fixedly connected to the electrode mounting plate 1003, and the electrode mounting plate 1003 is used to fixedly mount the right electrode 13. A second limiting member 1002 and a second return spring 1004 are respectively connected between the two second mounting bases 1001 and the second slider 1005 close to them. The electrode mounting plate 1003 is connected to the second slider 1005 by bolts. The second slider 1005, the second limiting member 1002, and the second return spring 1004 are axially matched with the second linear guide 1006 through inner holes. The second linear guide 1006 is fixed to the second mounting base 1001 by studs, and the second mounting base 1001 is fixed to the mounting frame 6 by studs. The second return spring 1004 provides an elastic restoring force for the electrode mounting plate 1003 to realize the automatic reset function after deformation.

[0059] In a specific embodiment, the left electrode 13 is fixed to the mounting frame 6 through a groove on the mounting frame 6, and the right electrode 13 is fixed in a groove of the electrode mounting plate 1003 in the electrode side translation mechanism 10.

[0060] In the above embodiment, as Figure 7 As shown, the lifting mechanism 12 includes a lifting platform 1203. The lifting platform 1203 is vertically fixed to the mounting frame 6 by bolts and is driven by a servo motor to lift. The top of the lifting platform 1203 is fixedly connected to a first insulating plate 1202. A plurality of ceramic columns 1201 are fixedly mounted on the top of the first insulating plate 1202 to support the plates and prevent current leakage. By lifting the upper plate through the lifting mechanism 12, the specified interval between the two plates can be changed in the vertical direction, thereby forming a controllable temperature gradient space. Combining with the local heating characteristics of the pulsed current, the differential temperature rise of the upper and lower plates can be realized.

[0061] In the above embodiment, as Figure 8As shown, the centering mechanism 14 includes two sets of positioning units arranged to move towards each other. A centering space for pushing the sheet material to be straightened from both sides is formed between the two positioning units. In order to make the two positioning units operate synchronously, a synchronous linkage mechanism is connected between the two positioning units, and the two positioning units are enabled to perform synchronous movement in opposite directions through the synchronous linkage mechanism. Specifically, the centering mechanism 14 includes two second cylinder mounting plates 1401, and the two second cylinder mounting plates 1401 are fixedly arranged on the bottom plate of the heat insulation box 2 at intervals. A centering cylinder 1405 is fixedly installed on the second cylinder mounting plate 1401. Two parallel third linear guide rails 1402 are arranged inside the two second cylinder mounting plates 1401. Among them, both positioning units slide on the two third linear guide rails 1402. The end of the cylinder push rod of the centering cylinder 1405 is connected to one of the positioning units, and the telescopic movement of the centering cylinder 1405 drives the positioning unit to perform linear reciprocating movement along the third linear guide rail 1402. At the same time, driven by the synchronous linkage mechanism, the other positioning unit is synchronously driven to perform linear reciprocating movement along the third linear guide rail 1402.

[0062] In a specific embodiment, the positioning unit includes a bottom support 1404, a centering push plate 1406, and a second insulating plate 1407. The bottom of the bottom support 1404 is fixedly connected with a third slider 1403, and the third slider 1403 is slidably matched with the third linear guide rail 1402. A plurality of centering push plates 1406 are fixedly connected to the upper surface of the bottom support 1404. The inner side of the top of the centering push plate 1406 is fixedly connected with the second insulating plate 1407, and the second insulating plates 1407 of the two positioning units are arranged facing each other. Among them, the centering cylinder 1405 is connected to the bottom support 1404 of one of the positioning units to drive the positioning unit to move along the third linear guide rail 1402. Further, a plurality of centering push plates 1406 are arranged in an equally spaced array along the length direction of the bottom support 1404.

[0063] In a specific embodiment, the synchronous linkage mechanism includes a rotating seat 1408 fixed on the bottom plate of the heat insulation box 2. The rotating seat 1408 is located at the central position between the two positioning units. A synchronous three-link rod 1409 is rotatably connected to the rotating seat 1408. The center of the middle link of the synchronous three-link rod 1409 rotates on the rotating seat 1408. The two ends of the middle link are respectively rotatably connected to a first link and a second link, and the first link and the second link have the same length. The end of the first link far from the middle link is rotatably connected to the bottom support 1404 of one positioning unit, and the end of the second link far from the middle link is rotatably connected to the bottom support 1404 of the other positioning unit. The first link, the middle link and the second link are sequentially hinged to form a three-link mechanism to realize the synchronization of the two positioning units. The centering mechanism 14 with the above structure can push the plate to the central position to realize the centering operation of the plate. In some embodiments, by adjusting the connection position of the synchronous linkage mechanism and the bottom support 1404, or adjusting the lengths of the first link and the second link, the angle of the push plate can be adjusted to adapt to plates of different widths.

[0064] It should be understood that in practical applications, the centering cylinder 1405 can be replaced by a double-shaft telescopic motor or a double-shaft cylinder. Taking the double-shaft telescopic motor as an example, the double-shaft telescopic motor includes two telescopic shafts arranged in opposite directions, and the ends of the two telescopic shafts are respectively fixedly connected to the bottom supports 1404 of the two positioning units. In this way, the synchronous drive of the two positioning units can also be realized, so that the two move away from or close to each other to achieve the same purpose of centering the plate.

[0065] Embodiment 2

[0066] Embodiment 2 of the present invention proposes a method for current rapid gradient heating and anisothermal rolling of composite plates. Using the device for current rapid gradient heating and anisothermal rolling of composite plates described in Embodiment 1 above, taking the rolling of TA1 titanium plate and T2 copper plate as an example, this method includes the following steps:

[0067] Step S1, Material preparation:

[0068] Select a TA1 titanium plate with dimensions of 150 mm × 50 mm × 2 mm (length × width × thickness) and a T2 copper plate with dimensions of 100 mm × 50 mm × 4 mm, and stack and combine them into a composite plate blank to be rolled.

[0069] Step S2, Clamping and environment preparation:

[0070] Open the entrance door of the heat insulation box 2, and place the stacked composite plate blank on the ceramic column 1201 support surface of the lifting table 1203;

[0071] Start the centering mechanism 14. The centering cylinder 1405 drives the centering push plate 1406 to slide along the third linear guide 1402, and precisely pushes the composite slab to the central position of the heat insulation box 2.

[0072] Close the inlet door, introduce argon through the air inlet 9, and at the same time open the exhaust port 7 to discharge air. Continuously ventilate and monitor the oxygen content in the box until the oxygen content is lower than 50 ppm, creating a good inert gas protection environment to prevent the oxidation of the plates during the subsequent heating process.

[0073] Step S3: Setting of different temperature gradients and pressing control:

[0074] The lifting mechanism 12 is started to lift the upper T2 copper plate, so that the distance between the T2 copper plate and the TA1 titanium plate is 2 mm, preparing for the subsequent formation of a temperature gradient regulation space.

[0075] The first pressing mechanism 31 and the second pressing mechanism 32 act synchronously. The pressure sensor 304 monitors the pressing force in real time and feeds the data back to the control system. The control system dynamically adjusts the cylinder output pressure according to the feedback to ensure that the upper and lower plates receive uniform and appropriate pressing forces.

[0076] The position difference compensation mechanism 303 operates, and the balls 30302 inside it roll in the cage 30303 to automatically compensate for the displacement deviation caused by the thickness difference between the upper and lower plates, further ensuring the uniform distribution of the pressing force and providing a stable plate constraint state for the subsequent heating and rolling processes.

[0077] Step S4: Pulse current heating and deformation adaption:

[0078] Pulse current is passed through the electrode 13 with a current intensity of 500 A, a frequency of 500 Hz, a duty cycle of 50%, and a heating time of 40 s. The Joule heat effect is used to quickly heat the plate interface.

[0079] The temperature sensors installed at the upper and lower positions of the plates monitor the temperature data in real time and feed the data back to the PID control system. The control system dynamically adjusts the current parameters according to the feedback to keep the temperature difference between the upper and lower plates stable within the target range. The lower TA1 titanium plate heats up quickly, and the temperature rise of the upper T2 copper plate lags relatively, forming an ideal controllable temperature gradient.

[0080] As the plates are heated and extended, the slider of the pressing side translation mechanism 5 slides horizontally along the linear guide, and the return spring provides a reverse return force to effectively prevent the plates from warping and deforming during the heating process. At the same time, the electrode side translation mechanism 10 drives the electrode 13 to move synchronously with the deformation of the plates to ensure that the current path always remains stable and guarantee the smooth progress of the pulse current heating process.

[0081] Step S5: Rolling and discharging:

[0082] After the temperatures of the upper and lower plates reach the target temperatures, the double pressing mechanism 3 rises, and the multi-stage oil cylinder 8 operates to push the heated composite plate to the rolling mill 1;

[0083] The rolling mill 1 rolls the composite plate at a set reduction rate of 50%. Under high temperature and high pressure conditions, the interface metal undergoes sufficient plastic deformation and forms a good metallurgical bond, completing the rolling of the composite plate;

[0084] After rolling is completed, the outlet door automatically opens, and the finished composite plate is smoothly output through the conveyor roller table. Thus, a complete processing cycle of differential temperature rolling for the TA1 titanium plate and the T2 copper plate composite plate is completed.

[0085] Compared with the prior art, the above Embodiment 1 and Embodiment 2 disclose at least the following beneficial effects:

[0086] By accurately adjusting the distance between the upper and lower plates through the lifting mechanism 12 and combining with the skin effect of the pulsed current (the skin effect refers to the phenomenon that when a conductor passes through an alternating current, the current density is unevenly distributed across the cross-section of the conductor), the lower plate is rapidly heated, and the temperature rise of the upper plate lags behind, thereby forming a controllable and stable temperature gradient. In the above embodiment, when performing differential temperature rolling on the TA1 titanium plate and the T2 copper plate composite plate, the control accuracy of the differential temperature gradient reaches ±5°C, effectively solving the problems of interface slip and deformation incoordination caused by the difference in deformation resistance of dissimilar metals in the traditional process, and providing a strong guarantee for the good bonding of the composite plate interface.

[0087] The dual adaptive mechanisms of the translation mechanism and the position difference compensation mechanism 303 can effectively offset the lateral extension displacement generated during the heating process of the plate and compensate for the longitudinal thickness difference, completely eliminating the risk of plate warping. The warping amount of the composite plate processed by the device and method of this embodiment is less than 0.1 mm / m, which is 90% lower than that of the control group without the translation mechanism, significantly improving the flatness and dimensional accuracy of the composite plate, and further enhancing the overall quality of the product, meeting the strict quality requirements for metal laminated composite plates in high-end application fields such as aerospace, automotive manufacturing, and ocean engineering.

[0088] The inert gas environment in the heat insulation box 2 effectively prevents the oxidation of the plate during the heating process. At the same time, the instantaneous heating characteristic of the pulsed current (heating time is less than 40 s) avoids the problems of large thermal inertia and difficult temperature precise control in the traditional heating furnace, enabling the interface metal of the composite plate to achieve metallurgical bonding under high temperature and high pressure under more ideal temperature conditions. After testing, for the composite plate of the TA1 titanium plate and the T2 copper plate rolled by this method, the interface shear strength is about 149 MPa, and the tensile strength is 404 MPa, significantly enhancing the interface bonding strength of the composite plate and improving the reliability and service life of the product.

[0089] The pulse current heating technology features fast speed and high efficiency, capable of heating the sheet to the required temperature within a short time. Compared with the overall heating methods of traditional resistance furnaces or gas furnaces, it significantly reduces the heating time, thus remarkably lowering the energy consumption. In the above embodiment, the energy consumption for single heating is reduced by 40%. Meanwhile, due to the fast heating speed and smooth rolling process, the production efficiency is increased by 3 times, providing a more efficient and energy-saving solution for the industrial production of metal laminated composite plates, and having significant economic and social benefits.

[0090] In summary, the present invention effectively solves the key technical problems such as heterogeneous temperature gradient regulation, deformation coordination and interface oxidation, significantly improves the interfacial bonding quality, flatness and dimensional accuracy of the composite plate, reduces the energy consumption, improves the production efficiency, opens up a new way for the industrial production of high-performance metal laminated composite plates, and has broad application prospects and important popularization and application value.

[0091] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0092] The above-described embodiments are only used to describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An apparatus for rapid current gradient heating of a non-isothermal rolled composite plate, characterized in that, Including: A heat insulation box (2), provided on the inlet side of the rolling mill (1), with a sealed cavity inside for forming an inert gas protection environment; an installation rack (6) is fixed inside the heat insulation box (2); A double pressing mechanism (3) for pressing the sheet from above, including a first pressing mechanism (31) and a second pressing mechanism (32), the first pressing mechanism (31) is fixedly connected to the installation rack (6), and the second pressing mechanism (32) is movably matched with the installation rack (6); A pressing side translation mechanism (5), including two first mounting seats (501) arranged at intervals along the connection line direction of the first pressing mechanism (31) and the second pressing mechanism (32); the two first mounting seats (501) are fixedly connected to the installation rack (6), and two first linear guide rails (503) are connected between the two; a first cylinder mounting plate (506) slides on the first linear guide rail (503) and is elastically connected to one of the first mounting seats (501); the second pressing mechanism (32) is fixed below the first cylinder mounting plate (506); when the sheet is heated and extended, the second pressing mechanism (32) pressing on the upper surface of the sheet adapts to the displacement accordingly; An electrode system for passing a pulsed current to heat the sheet, including two electrodes (13).

2. The device for rapid current gradient heating and anisothermal rolling composite plate according to claim 1, characterized in that One of the electrodes (13) in the electrode system is movably connected to the installation rack (6) through an electrode side translation mechanism (10), the electrode side translation mechanism (10) includes a second mounting seat (1001), a second limiting member (1002), an electrode mounting plate (1003), a second return spring (1004) and a second linear guide rail (1006), the two second mounting seats (1001) are fixedly connected to the installation rack (6), and the two second linear guide rails (1006) are fixedly connected between the two second mounting seats (1001); the electrode mounting plate (1003) slides on the second linear guide rail (1006) and is elastically connected to one of the second mounting seats (1001); the electrode (13) is fixed on the electrode mounting plate (1003) and slides on the second linear guide rail (1006) along with the electrode mounting plate (1003) to adapt to the extension deformation of the sheet when heated.

3. The device for rapid current gradient heating and differential temperature rolling composite plate according to claim 2, characterized in that Both the bottom of the first pressing mechanism (31) and the second pressing mechanism (32) are connected to a position difference compensation mechanism (303), the position difference compensation mechanism (303) includes an upper end cover (30301), a ball (30302), a cage (30303), a lower end cover (30304) and a moving member (30305), for compensating the displacement deviation caused by the thickness difference between the upper and lower sheets and the deviation caused by the displacement non-synchronization between the pressing side translation mechanism (5) and the electrode side translation mechanism (10); the ball (30302) is limited in the cage (30303) and is in rolling contact with the top end of the moving member (30305) passing through the lower end cover (30304).

4. The device for rapid current gradient heating and differential temperature rolling composite plate according to claim 3, characterized in that, The bottom end of the moving member (30305) is connected to a pressure sensor (304).

5. The device for rapidly gradient heating and anisothermal rolling composite plates according to claim 1, characterized in that, It further includes a lifting mechanism (12), and the lifting mechanism (12) includes a lifting platform (1203). The distance between the upper and lower plates is adjusted by driving the lifting platform (1203), and the precise control of the temperature gradient is realized in cooperation with the electrode system.

6. The device for rapid current gradient heating and anisothermal rolling composite plate according to claim 5, characterized in that The top of the lifting platform (1203) of the lifting mechanism (12) is connected to a first insulating plate (1202), and a plurality of ceramic columns (1201) are supported on the top of the first insulating plate (1202) for supporting the plates and preventing current leakage.

7. The device for rapid current gradient heating and differential temperature rolling composite plate according to claim 1, characterized in that A first return spring (505) is connected between the first cylinder mounting plate (506) and the first mounting seat (501) on one side. A first limiting member (502) is provided between the first cylinder mounting plate (506) and the first mounting seat (501) on one side, and the first limiting member (502) is in threaded cooperation with the first linear guide rail (503).

8. The device for rapid current gradient heating and isothermal rolling composite plate according to claim 1 or 5, characterized in that, It further includes a temperature monitoring system. The temperature monitoring system includes a first temperature sensor (4) and a second temperature sensor (11). The first temperature sensor (4) is fixed on the first pressing mechanism (31) through an upper sensor mounting plate (33), and the second temperature sensor (11) is fixed on a mounting bracket (6) below the plate through a lower sensor mounting plate.

9. The device for rapid current gradient heating and anisothermal rolling composite plate according to claim 1, characterized in that, It further includes a centering mechanism (14). The centering mechanism (14) includes two groups of positioning units. The two groups of positioning units slide towards each other on a third linear guide rail (1402), and are driven by a centering cylinder (1405) to move away from or close to each other. A synchronous linkage mechanism for driving the two groups of positioning units to act synchronously is also connected between the two groups of positioning units. The two groups of positioning units push the plate from both sides to the centered position.

10. A method for preparing a composite plate with rapid current gradient heating and non-isothermal rolling, using the device for preparing a composite plate with rapid current gradient heating and non-isothermal rolling according to any one of claims 1 to 9, characterized in that, It includes the following steps: Step S1, material preparation: Select the composite plate blank to be rolled. Step S2, clamping and environment preparation: Transfer the composite plate blank to the support table and place it in the center, and introduce an inert gas to build a protective environment. Step S3, setting of different temperature gradients and pressing control: Adjust the distance between the upper and lower plates, and the double pressing mechanism (3) presses the plate and monitors the pressing force. Step S4, pulse current heating and deformation adaptation: Pulse current is introduced into the electrode (13) to heat the plate, the temperature is monitored in real time and feedback adjusted, and the translation mechanism adapts to the deformation of the plate. Step S5, rolling and discharging: Push the heated composite plate to the rolling mill (1) for rolling to complete the rolling of the composite plate.

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