Device and method for testing bending forming capacity of metal composite plate

Abstract

The invention belongs to the technical field of metal plate processing and testing, and particularly discloses a device and method for testing the bending forming capacity of a metal composite plate. The device comprises a test base, a movable heating mechanism which slides and can be locked on the test base, a bending test mechanism rotationally connected to the test base, a fixed hydraulic mechanism, a first driving motor and a second driving motor, a heating element is arranged in the movable heating mechanism, so that the plates can be uniformly heated on line; the bending test mechanism controls the clamping force and the bending angle of the bearing through a servo motor in a closed-loop manner, and collects pressure and angular displacement data in real time; and the hydraulic telescopic head of the fixed hydraulic mechanism executes reverse pushing after single bending, so that a fatigue cycle test is realized. According to the invention, normal-temperature / thermal-state multi-angle bending and fatigue testing can be carried out on metal composite plates with different specifications, the forming limit and layering failure critical parameters are rapidly obtained, and the process optimization efficiency and the product reliability are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal plate processing and testing, and particularly relates to a metal composite plate bending forming capacity testing device and method. BACKGROUND

[0002] Metal composite plates have been widely used in the manufacturing fields of automobiles, aviation and aerospace due to their comprehensive performances such as lightweight and high strength. In these fields, the metal composite plates usually need to be subjected to forming processes such as stamping and bending. The minimum bending radius and the bending fatigue number are key parameters for judging the forming limit and avoiding cracking or delamination failure. Therefore, how to quickly and accurately measure the bending performance of the metal composite plate is of great significance for optimizing the forming process and improving the product reliability.

[0003] At present, mechanical bending machines and hydraulic bending machines are mainly used in industry for bending processing or bending forming capacity testing of metal plates. The mechanical bending machine drives the upper die to stamp and bend the plate through a motor-driven flywheel and a crank slider mechanism. The mechanical bending machine has simple structure and low cost, but different bending tests of different radii and angles need to replace different bending dies, and the mechanical bending machine is usually only suitable for large-scale bending processing and fixed-size bending tests. The hydraulic bending machine drives the slider to move through a hydraulic cylinder, and the bending force is controlled by adjusting the pressure of the hydraulic system, which can realize larger pressure and more precise stroke control, and is suitable for thicker plates or high-precision bending forming requirements. However, in the bending performance testing process of the hydraulic bending machine, the die and the plate need to be manually adjusted and positioned, the testing process is complicated, and testing errors are easy to occur, so it is difficult to adapt to the testing requirements of the bending forming capacity of metal composite plates of different specifications and thicknesses.

[0004] Therefore, it is necessary to propose a new metal composite plate bending forming capacity testing device and method to overcome the shortcomings of the prior art. SUMMARY

[0005] The present application aims to provide a metal composite plate bending forming capacity testing device and method to solve the above technical problems existing in the prior art.

[0006] To achieve the above object, in one aspect, the present application provides a metal composite plate bending forming capacity testing device, comprising a testing base; a mobile heating mechanism sliding on the testing base and positioned by locking screws, comprising a bending workbench and built-in heating elements, the bending workbench forming a conformal support from the bottom of the metal composite plate; a bending test mechanism rotationally connected to the testing base, comprising a bending clamping slider, a bearing, a pressure sensor and a second drive motor, the bearing and the pressure sensor are both arranged on the side of the bending clamping slider close to the metal composite plate, the second drive motor drives the bending clamping slider to apply clamping force to the surface of the metal composite plate; a fixed hydraulic mechanism fixed to the testing base, provided with a hydraulic telescopic head; the hydraulic telescopic head provides bending guidance and linkage with the bearing to perform reverse pushing and restoring action after single bending; a first drive motor driving the bending test mechanism to rotate as a whole to control the bending angle.

[0007] Further, the heating elements are arranged on the side of the mobile heating mechanism facing the metal composite plate, and conform to the surface of the metal composite plate during work.

[0008] Further, the heating elements are eddy current coils, which generate induced eddy current on the surface layer of the metal composite plate by high-frequency alternating current to achieve instantaneous and uniform heating.

[0009] Further, the side of the fixed hydraulic mechanism in contact with the mobile heating mechanism is provided with a clamping plate clamping groove, which is used to embed the bending workbench to conform and clamp metal composite plates of different thicknesses.

[0010] Further, the bearing is isolated and installed in the bending clamping slider through a bearing mounting sleeve and is axially positioned by a bearing clamping screw.

[0011] Further, a moving groove is opened on the mobile heating mechanism, which realizes sliding guidance and rigid locking with the testing base through locking screw cooperation.

[0012] Further, a positioning stop is provided on the testing base, which adjusts the distance between the bending workbench and the fixed hydraulic mechanism through locking screw cooperation with the moving groove of the mobile heating mechanism.

[0013] Further, a motor cooperation hole is opened on the bending test mechanism, and a motor mounting hole is opened on the fixed hydraulic mechanism, the bending test mechanism is transmissionally connected with the output shaft of the first drive motor through the motor cooperation hole, and the motor cooperation hole and the motor mounting hole are coaxially arranged.

[0014] Further, a motor heat insulation cylinder is fixedly arranged between the first drive motor and the fixed hydraulic mechanism.

[0015] In another aspect, the present application provides a metal composite plate bending forming capacity test method based on the metal composite plate bending forming capacity test device of any one of the above, the method comprising the following steps:

[0016] Adjusting the position of the moving heating mechanism and clamping the metal composite plate;

[0017] Starting the second drive motor to drive the bending clamping slider, so that the bearing is in tangential contact with the metal composite plate and the pressure sensor is initialized;

[0018] Synchronously driving the first drive motor to control the bending angle and the second drive motor to control the clamping force;

[0019] Real-time acquisition of clamping force and angular displacement data, and fusion calculation of bending mechanics parameters;

[0020] Reverse pushing and restoring action is performed by the hydraulic telescopic head to realize bending fatigue cycle test.

[0021] Compared with the prior art, the present application at least discloses the following beneficial effects:

[0022] The device and method of the present application can realize bending test of metal composite plates of different thicknesses at different positions and at various angles, synchronously acquire the limit bending radius at different positions, and provide reliable basis for evaluating the bending forming performance; at the same time, the bending force during bending can be measured in real time to analyze the bending forming capacity of the composite plate in depth; in addition, through cooperation with the heating mechanism, online heating bending test of the test metal composite plate can be realized to acquire the bending forming performance of the metal composite plate at different forming temperatures; the device is also provided with a hydraulic lever bending restoring mechanism to flexibly drive accurate restoration of the plate after bending, which not only meets the demand of conventional bending test, but also provides stable data support for reverse bending fatigue test; the force value change during bending is recorded by sensors at different positions, the change of the bending force at different positions and at different bending angles during bending is monitored in real time, and the accurate control of different loading forces and displacements during bending is realized by the motor, so that the best bending force and the limit bending angle of the metal composite plate bending forming are acquired, and the cracking or delamination failure phenomenon during the forming process of the metal composite plate is effectively avoided. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1The overall structure schematic diagram of the metal composite plate bending forming capacity testing device of the present application;

[0025] Figure 2 The position relation schematic diagram of the mobile heating mechanism, the fixed hydraulic mechanism and the testing base in the device of the present application;

[0026] Figure 3 The structure schematic diagram of the bending testing mechanism in the device of the present application;

[0027] Figure 4 The state diagram of the device of the present application before bending;

[0028] Figure 5 The state diagram of the device of the present application after bending.

[0029] In the figure: 1, testing base; 2, locking screw; 3, mobile heating mechanism; 4, mounting screw; 5, fixed hydraulic mechanism; 6, bending testing mechanism; 7, first driving motor; 8, bearing; 9, motor heat insulation gasket; 10, metal composite plate; 11, motor heat insulation cylinder; 301, mobile groove; 302, heating element; 303, bending workbench; 501, clamping plate clamping groove; 502, fixed hydraulic mechanism mounting hole; 503, hydraulic telescopic head; 504, motor mounting hole; 505, fixed hydraulic mechanism circulating oil port; 601, motor matching hole; 602, bearing clamping screw; 603, bending testing mechanism mounting seat; 604, bending clamping sliding block; 605, bearing mounting sleeve; 606, second driving motor; 607, pressure sensor; 608, bending clamping sliding block mounting bottom plate; 609, bending clamping sliding block driving shaft. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0032] REFERENCE Figures 1 to 5As shown, this embodiment provides a metal composite plate bending forming capability testing device, including a test base 1, a movable heating mechanism 3, a fixed hydraulic mechanism 5, a bending test mechanism 6, and a drive system. The test base 1 serves as the main support platform, providing overall stable support and ensuring precise positioning and coordinated operation of each mechanism. The movable heating mechanism 3 clamps the metal composite plate 10 and provides online heating. The fixed hydraulic mechanism 5 provides clamping reaction force, supports repeated bending cycles, and works with the bending test mechanism 6 to perform bending tests on different positions of the metal composite plate 10. The bending test mechanism 6 executes dynamic bending tests by precisely controlling the bending angle and collects test data in real time. The drive system includes a first drive motor 7 for controlling the bending angle and a second drive motor 606 for precisely controlling the loading force. The two motors operate synchronously to ensure that the angle and force change stably according to preset parameters during the bending process. This device integrates heating, hydraulic recovery, and electromechanical control, solving the industry pain points of traditional equipment being unable to simultaneously test multiple parameters and adapt to multiple specifications.

[0033] Specifically, the test base 1 serves as the main support platform, providing overall stable support and ensuring precise positioning and coordinated operation of each mechanism. The edges of the test base 1 are provided with mounting grooves (such as T-slots) and threaded holes, which can be used to fix the test base 1 to the test platform (T-slot platform) with T-bolts.

[0034] The movable heating mechanism 3 includes a movable groove 301, a heating element 302, and a bending worktable 303. The movable heating mechanism 3 is connected to the test base 1 via locking screws 2. The locking screws 2 cooperate with the movable groove 301 to adjust the position of the movable heating mechanism 3. This position adjustment allows for the clamping of metal composite plates 10 of different thicknesses before bending. Specifically... Figure 2 As shown. The heating element 302 is attached to the metal composite plate 10 that needs to be hot-bent, and heats the metal composite plate 10 online after being powered on, so as to adjust the temperature at different times during the hot bending process. The bending worktable 303 is used to attach to the bottom surface of the metal composite plate 10, keeping the metal composite plate 10 and the bearing 8 in the same horizontal plane.

[0035] In one specific embodiment, the heating element 302 is an eddy current coil, which generates induced eddy currents on the surface of the metal composite plate 10 through high-frequency alternating current to achieve instantaneous uniform heating.

[0036] In one specific embodiment, the test base 1 is provided with a positioning stop for pre-positioning the moving heating mechanism 3. The positioning stop and the moving groove 301 of the moving heating mechanism 3 are engaged by locking screws 2 to achieve sliding guidance and rigid locking.

[0037] The fixed hydraulic mechanism 5 is fixed to the base by mounting screws 4, as follows: Figure 2The fixed hydraulic mechanism 5 is in the shape of a mechanism as a whole, including a clamping plate clamping groove 501, a fixed hydraulic mechanism mounting hole 502, a hydraulic telescopic head 503, a motor mounting hole 504, and a fixed hydraulic mechanism circulating oil port 505. The clamping plate clamping groove 501 is used to be fitted with the bending workbench 303 to adapt to metal composite plates 10 of different thicknesses and achieve clamping. The fixed hydraulic mechanism mounting hole 502 is used for the installation screw 4 to pass through and be screwed with the threaded mounting hole on the test base 1, so as to lock the fixed hydraulic mechanism 5 on the test base 1. The hydraulic telescopic head 503 is driven by a hydraulic cylinder and can be used to implement bending fatigue tests on metal composite plates 10 of different thicknesses, and can also be used to complete bending tests on specified positions of the metal composite plate 10 in cooperation with other bending components. The motor mounting hole 504 is used to be sleeved with the motor heat insulation cylinder 11 and then be fixedly connected with the first driving motor 7, so as to achieve the installation and positioning of the first driving motor 7. The fixed hydraulic mechanism circulating oil port 505 is communicated with the hydraulic cylinder oil circuit and is used to input and return hydraulic oil, so as to control and lock the position of the hydraulic telescopic head 503.

[0038] As shown in Figure 3 The bending test mechanism 6 includes a motor matching hole 601, a bearing clamping screw 602, a bending test mechanism mounting seat 603, a bending clamping sliding block 604, a bearing mounting sleeve 605, a second driving motor 606, a pressure sensor 607, a bending clamping sliding block mounting bottom plate 608, and a bending clamping sliding block driving shaft 609. The motor matching hole 601 is used to be matched and installed with the first driving motor 7 to drive the entire bending test mechanism 6 to rotate at different angles. The bearing clamping screw 602 is used to fix the bearing 8 during the bending process. The bending test mechanism mounting seat 603 is used to mount different components on the bending test mechanism 6. The bending clamping sliding block 604 is provided with a mounting column of the bearing 8, a mounting hole of the pressure sensor 607, and the bending clamping sliding block driving shaft 609. The bearing 8 is driven by the bending clamping sliding block 604 to move linearly on the bending test mechanism 6. The bearing mounting sleeve 605 is used to separate the bearing 8 from the bearing clamping screw 602 at the mounting hole position, so as to ensure that the bearing 8 can stably rotate after being installed. The second driving motor 606 is installed on the driving motor hole of the bending test mechanism 6 to provide driving force for the bending clamping sliding block driving shaft 609. The pressure sensor 607 is installed between the bending clamping sliding block driving shaft 609 and the bending clamping sliding block 604 to measure the clamping force provided by the driving shaft in real time. The bending clamping sliding block mounting bottom plate 608 is matched with the bending clamping sliding block 604 through screws to achieve the installation of the bending clamping sliding block 604 on the bending test mechanism 6. The bending clamping sliding block driving shaft 609 controls the linear movement of the bending clamping sliding block 604 and the bearing 8 at different positions through rotation, so as to achieve the clamping and pressing bending of the metal composite plate 10 by the bearing 8 during the bending process.

[0039] This invention also provides a method for testing the bending and forming capability of metal composite plates, using the metal composite plate bending and forming capability testing device described in the above embodiments. The method includes the following steps:

[0040] S1. Assemble and debug the testing device.

[0041] S101. Use T-bolts to fix the test base 1 to the test platform through several T-slots set on its edge, ensuring that the parallelism between the reference surface of the test base 1 and the plane of the test platform is ≤0.05mm.

[0042] S102. Place the movable heating mechanism 3 in the corresponding positioning stop of the base, and complete the pre-positioning by cooperating with the movable grooves 301 symmetrically opened on both sides of the movable heating mechanism 3 using the locking screws 2; then slide the mechanism to the limit position along the guide of the movable grooves 301 and lock it to ensure that the heating surface is coplanar with the subsequent bending worktable 303.

[0043] S103. Take the fixed hydraulic mechanism 5, align its mounting hole with the threaded hole of the base, and then apply the specified torque with the mounting screw 4 to lock it, forming a rigid clamping frame.

[0044] S104. Insert the bending clamping slider 604 from top to bottom, and then screw the bending clamping slider drive shaft 609 into the center threaded hole of the slider; then fit the bending clamping slider mounting base plate 608 from bottom to top and lock it with screws to ensure that the slider can make backlash-free linear reciprocating motion along the precision guide groove of the bending test mechanism mounting seat 603.

[0045] S105. The pressure sensor 607 is embedded in the sensor groove on the side wall of the bending clamping slider 604. Then, the bearing mounting sleeve 605 is fitted onto the bearing 8 mounting post at the top of the slider. The inner ring of the bearing 8 is then fitted onto the mounting post. Finally, the bearing clamping screw 602 is screwed in to complete the axial positioning and pre-tightening of the bearing 8.

[0046] S106. The pre-assembled bending test mechanism 6 is hoisted onto the base and the motor mating hole 601 is aligned with the motor mounting hole 504. Then, the motor heat insulation cylinder 11 and the first drive motor 7 are placed in sequence and locked with flange screws to form an integrated interface for thermal isolation and power transmission.

[0047] S107, drive the motors and hydraulic cylinders of each mechanism back to their original positions. Figure 4 The initial zero position before bending is shown; power on the heating element 302 of the moving heating mechanism 3 to perform a temperature rise self-test, and confirm that there are no abnormalities in the feedback signals of each module, thus completing the installation of the whole machine.

[0048] S2, control the first drive motor 7 and the fixed hydraulic mechanism 5 reset to the initial zero position; loosen the locking screw 2, adjust the moving heating mechanism 3 opening distance, place the metal composite plate 10 to be tested on the bending workbench 303, lock again, realize accurate positioning and rigid clamping of the plate.

[0049] S3, start the second drive motor 606, drive the bending clamping slider drive shaft 609 to rotate, make the bearing 8 outer circle keep theoretical tangent contact with the surface of the metal composite plate 10, and clear the reading of the pressure sensor 607 as the initial force reference.

[0050] S4, if heat bending test is needed, power on the heating element 302, make the metal composite plate 10 warm up to the preset test temperature, and maintain the temperature fluctuation ±2℃; then start the first drive motor 7 and the second drive motor 606 synchronously.

[0051] S5, while the first drive motor 7 drives the bending test mechanism 6 to rotate, the second drive motor 606 adjusts the bending clamping slider drive shaft 609 angle in real time, ensures that the bearing 8 is always dynamically attached to the metal composite plate 10; the pressure sensor 607 outputs the clamping force in real time, the first drive motor 7 encoder outputs the angular displacement and angular velocity in real time, and the two data fusion calculations instant bending moment, so as to accurately obtain the mechanical parameters required for bending.

[0052] S6, by cooperatively adjusting the angular displacement of the first drive motor 7 and the linear displacement of the second drive motor 606, the metal composite plate 10 can be continuously bent at multiple points and angles; supplemented by the extension stroke of the hydraulic telescopic head 503 in the fixed hydraulic mechanism 5, the local bending of the plate at different transverse positions can be further completed.

[0053] S7, if bending fatigue test is needed, use the hydraulic telescopic head 503 on the fixed hydraulic mechanism 5 to restore the clamped and bent metal composite plate 10 to the state before bending during the extension process; then the hydraulic telescopic head 503 is retracted to zero position, and the first drive motor 7 and the second drive motor 606 are started again to execute the next bending cycle.

[0054] S8, the first drive motor 7 records the number of bending cycles, and outputs the maximum bending force value synchronously in each cycle to form a fatigue life-load mapping database, which is used to evaluate the anti-delamination failure and anti-cracking performance limit of the metal composite plate 10 under specified working conditions.

[0055] Example 1:

[0056] In one specific embodiment, the bending forming ability test of the 9.6mm titanium-aluminum composite plate processed by 12mm aluminum plate and 4mm titanium plate at different temperatures is carried out, wherein the aluminum plate is used as the inner layer of the bending test, and the titanium plate is used as the outer layer of the bending test. The test steps and test results are as follows:

[0057] S1, control the first drive motor 7 and the fixed hydraulic mechanism 5 to return to the state as follows: Figure 4 The initial state before bending is shown. Loosen the locking screw 2, adjust the moving heating mechanism 3 to place the titanium-aluminum composite plate on the bending worktable 303 and then clamp the titanium-aluminum composite plate so that the aluminum plate, as the inner layer of the bending test, contacts the fixed hydraulic mechanism 5, and the titanium plate, as the outer layer of the bending test, contacts the moving heating mechanism 3. Then, use the locking screw 2 to lock the moving heating mechanism 3 that clamps the titanium-aluminum composite plate.

[0058] S2. Use the second drive motor 606 to drive the bending clamping slider drive shaft 609 to rotate, so that the bearing 8 is just tangent to the metal composite plate 10. At this time, the pressure sensor 607 parameters are adjusted to the initial state.

[0059] S3. By adjusting the first drive motor 7 and the second drive motor 606, a bending test was conducted on the titanium-aluminum composite plate. In the initial test, after the bending angle reached 90°, the first drive motor 7 and the second drive motor 606 were controlled to unload the force. It was found that, under room temperature conditions, the titanium-aluminum composite plate exhibited delamination failure after springback from a 90° bend.

[0060] S4. Replace the titanium-aluminum composite plate bending test piece of the same specification that has not been bent and conduct bending forming ability tests at different temperatures. After testing, it was found that the titanium-aluminum composite plate selected in this embodiment has optimized bending forming ability at 300℃. After bending 90°, there will be no delamination failure, but there will be a 25° springback.

[0061] Example 2:

[0062] In one specific embodiment, the bending forming ability of a 5.8mm magnesium-aluminum composite plate processed from an 8mm magnesium plate and a 5mm aluminum plate was tested at different temperatures. The magnesium plate was used as the inner layer for the bending test, and the aluminum plate was used as the outer layer for the bending test. The test steps were the same as in Example 1. The test results showed that the forming performance of the magnesium-aluminum composite plate was significantly improved in the temperature range of 150℃ to 300℃. After a 90° bend, the sample showed almost no springback, and the fracture phenomenon that was prone to occur on the outer aluminum plate at room temperature was completely eliminated under high temperature conditions.

[0063] Compared with the prior art, the present invention has the following significant advantages:

[0064] 1. Employing built-in eddy current coil heating technology, a high-frequency eddy current coil is integrated inside the moving heating mechanism 3 to directly convert high-frequency alternating current into an induced current on the surface of the metal composite plate 10, achieving instantaneous and uniform temperature rise before testing. This design enables bending performance testing of the sheet material at different forming temperatures on a continuous production line, significantly improving testing efficiency and temperature control accuracy.

[0065] 2. The bending-recovery double-acting mechanism driven by hydraulic pressure is adopted to perform reverse recovery action immediately after completing single bending forming, so as to realize reverse bending fatigue test in the same station. Through real-time monitoring of fatigue cycle number and load amplitude, key use parameters are obtained, and cracking or delamination failure risk in forming and service process is identified and avoided in advance.

[0066] 3. The adjustable clamping plate structure of sliding assembly is adopted, the sliding assembly clamping plate combined with the fixed hydraulic mechanism 5 can continuously adjust the clamping distance to adapt to the fixing constraint bending or free bending test requirements of different thickness and different width plates; at the same time, the plate positioning is stable and the data repeatability is high during the test, and a unified benchmark is provided for bending performance evaluation of different specifications of metal composite plate 10.

[0067] 4. The servo motor cooperates with the precision drive shaft to implement closed-loop control on the slider displacement, the stepless accurate setting of loading force is realized through torque adjustment, the load and displacement strictly follow the preset curve during the bending test process is ensured; and multi-dimensional sensors are arranged at key positions, real-time collection of load, displacement and deformation data is realized, and high reliability data support is provided for bending forming performance analysis of metal composite plate 10.

[0068] In the description of the present application, 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" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.

[0069] The above-described embodiments are only preferred modes of the present application, and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A device for testing the bend formability of a metal clad plate, characterized by, Comprising: a test base (1); a mobile heating mechanism (3) sliding on the test base (1) and positioned by locking screws (2), comprising a curved workbench (303) and an embedded heating element (302), the curved workbench (303) is formed from the bottom of the metal composite plate (10) to support the surface; a bending test mechanism (6) rotatably connected to the test base (1), comprising a bending clamping slider (604), a bearing (8), a pressure sensor (607) and a second drive motor (606), the bearing (8) and the pressure sensor (607) are both arranged on the side of the bending clamping slider (604) close to the metal composite plate (10), the second drive motor (606) drives the bending clamping slider (604) to apply clamping force to the surface of the metal composite plate (10); a fixed hydraulic mechanism (5) fixed to the test base (1), provided with a hydraulic telescopic head (503); the hydraulic telescopic head (503) provides bending guide and linkage with the bearing (8) to perform reverse pushing and restoring action after single bending; a first drive motor (7) drives the bending test mechanism (6) to rotate as a whole to control the bending angle.

2. The metal composite sheet bend formability testing apparatus according to claim 1, characterized by, The heating element (302) is arranged on the side of the mobile heating mechanism (3) facing the metal composite plate (10), and is in contact with the surface of the metal composite plate (10) during work.

3. The metal composite sheet bend formability testing apparatus according to claim 2, wherein The heating element (302) is an eddy current coil, which generates induced eddy current on the surface layer of the metal composite plate (10) by high-frequency alternating current to achieve instantaneous and uniform heating.

4. The metal composite sheet bend formability testing apparatus according to claim 1, characterized by, The side of the fixed hydraulic mechanism (5) in contact with the mobile heating mechanism (3) is provided with a clamping plate clamping groove (501), which is used for embedding with the curved workbench (303) to tightly clamp metal composite plates (10) of different thicknesses.

5. The metal composite sheet bend formability testing apparatus according to claim 1, wherein The bearing (8) is isolatedly installed in the bending clamping slider (604) through a bearing mounting sleeve (605) and is axially positioned by a bearing clamping screw (602).

6. The metal composite sheet bend formability testing apparatus according to claim 1, wherein The mobile heating mechanism (3) is provided with a moving groove (301), which realizes sliding guide and rigid locking with the test base (1) through the cooperation of the locking screws (2).

7. The metal composite sheet bend formability testing apparatus according to claim 6, wherein The test base (1) is provided with a positioning stop, which cooperates with the moving groove (301) of the mobile heating mechanism (3) through the locking screws (2) to adjust the distance between the curved workbench (303) and the fixed hydraulic mechanism (5).

8. The metal composite sheet bend formability testing apparatus according to claim 1, wherein The bending test mechanism (6) is provided with a motor cooperation hole (601), and the fixed hydraulic mechanism (5) is provided with a motor mounting hole (504), the bending test mechanism (6) is transmissionally connected with the output shaft of the first drive motor (7) through the motor cooperation hole (601), and the motor cooperation hole (601) and the motor mounting hole (504) are coaxially arranged.

9. The metal composite sheet bend formability testing apparatus according to claim 8, wherein A motor heat insulation cylinder (11) is arranged between the first drive motor (7) and the fixed hydraulic mechanism (5).

10. A method of testing the bend formability of a metal clad plate using the bend formability testing device according to any one of claims 1 to 9, characterized by The steps include: Adjust the position of the mobile heating mechanism (3) and clamp the metal composite plate (10); Start the second drive motor (606) to drive the bending clamping slider (604), make the bearing (8) and the metal composite plate (10) tangential contact and initialize the pressure sensor (607); Synchronous drive the first drive motor (7) to control the bending angle, and the second drive motor (606) to control the clamping force; Real-time acquisition of clamping force and angular displacement data, fusion calculation of bending mechanics parameters; Through the hydraulic telescopic head (503), the reverse pushing and restoring action is performed, and the bending fatigue cycle test is realized.

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