A servo motor-ultrasonic vibration compound stamping device and method for bipolar plate forming

Abstract

This invention discloses a servo motor-ultrasonic vibration composite stamping device and method for bipolar plate forming. The device includes a frame, a servo drive mechanism, a double-sided lead screw transmission mechanism, a whole-machine guide mechanism, a moving crossbeam, an ultrasonic vibration mechanism, and a punch and die. This invention uses dual servo motors to drive the double-sided lead screw mechanism to move the moving crossbeam and punch vertically, facilitating the adjustment of displacement, speed, and action sequence during the forming process. It is suitable for parameter setting and process control in bipolar plate forming experiments. Introducing ultrasonic vibration into the bipolar plate stamping process allows the punch to superimpose high-frequency vibration during pressing, which helps reduce forming force and provides a device basis for studying the influence of ultrasonic vibration on the bipolar plate forming process. This invention combines the servo drive structure, ultrasonic vibration mechanism, punch, and die into the same device, facilitating bipolar plate forming and ultrasonic-assisted forming related experiments, and is suitable for process parameter adjustment and forming process research.

Description

Technical Field

[0001] This invention relates to the field of metal bipolar plate stamping equipment technology, and in particular to a servo motor-ultrasonic vibration composite stamping device and method for bipolar plate forming. Background Technology

[0002] Metal bipolar plates are crucial functional components in fuel cells, serving to separate reactant gases, conduct electricity and heat, and support the internal structure of the cell. Compared to traditional graphite bipolar plates, metal bipolar plates are thinner, stronger, and easier to mass-produce and assemble, thus showing promising application prospects in the development of lightweight, miniaturized, and high-power-density fuel cells.

[0003] Currently, metal bipolar plates are mostly formed from relatively thin metal sheets such as stainless steel, titanium, and their alloys. Due to the small sheet thickness and the fact that the surface of the bipolar plate usually includes flow channels, frames, and sealing-related structures, the sheet material needs to undergo complex local plastic deformation under relatively small thickness conditions during the stamping process. This can easily lead to problems such as local thinning, wrinkling, cracking, springback, and insufficient flow channel formation, thus affecting the forming quality of the bipolar plate.

[0004] In existing bipolar plate forming research and experiments, mechanical presses, hydraulic equipment, or conventional loading devices are commonly used to achieve mold closure, causing plastic deformation of the sheet metal between the punch and die. While this method can achieve basic forming, bipolar plate forming experiments typically require devices with better applicability in areas such as loading displacement and speed adjustment, forming process control, and ultrasonic-assisted forming applications. Ultrasonic vibration-assisted plastic forming is an auxiliary forming method that superimposes high-frequency micro-amplitude vibrations onto conventional forming loads, and it has been applied in thin sheet forming and some precision plastic forming research. Therefore, it is necessary to provide a bipolar plate forming device that combines servo motor drive with ultrasonic vibration assistance to meet the requirements of bipolar plate forming experiments and related process research. Summary of the Invention

[0005] In order to overcome the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a servo motor-ultrasonic vibration composite stamping device and method for bipolar plate forming.

[0006] This invention combines the precise loading of a servo motor with the vibration assistance of ultrasound to achieve precise control of the loading stroke and speed during bipolar plate forming, and the synergistic application of ultrasonic-assisted friction reduction and softening effects.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] This invention provides a servo motor-ultrasonic vibration composite stamping device for bipolar plate forming, characterized in that it includes: a frame 1, a servo drive mechanism 2, a double-sided lead screw transmission mechanism 3, a whole machine guide mechanism 4, a moving crossbeam 5, an ultrasonic vibration mechanism 6, a punch 7, a die 8, and a control system.

[0009] The frame 1 adopts a portal frame structure, including a base 11, a mold base 12, a left column 13, a right column 14, and a top beam 15; the mold base 12 is set on the base 11 and is used to install the die 8; the left column 13 and the right column 14 are set on both sides of the base 11; the top beam 15 is connected to the upper ends of the left column 13 and the right column 14.

[0010] The portal frame structure formed by the frame 1 provides a mounting base for the servo drive mechanism 2, the double-sided lead screw transmission mechanism 3, the whole machine guide mechanism 4, the motion crossbeam 5, the ultrasonic vibration mechanism 6, and the punch 7 and die 8.

[0011] The double-sided lead screw transmission mechanism 3 is respectively arranged on the left and right sides of the frame 1, and each side includes a coupling 31, a bearing support 32, a lead screw 33 and a nut seat 34;

[0012] The lead screw 33 is vertically arranged on the left and right sides of the frame 1 and is installed on the frame 1 through the bearing support 32. The lead screw 33 is threadedly engaged with the nut seat 34. When the drive mechanism 2 drives the lead screw 33 to rotate, the nut seat 34 moves along the axial direction of the lead screw 33. The left and right nut seats 34 are respectively connected to the moving crossbeam 5, thereby converting the rotational motion of the drive mechanism 2 into the up and down linear motion of the moving crossbeam 5.

[0013] The servo drive mechanism 2 includes two servo motors 21, which are installed on the left and right sides above the top crossbeam 15, respectively. The output end of each servo motor 21 is connected to the corresponding lead screw 33 through a coupling 31. The rotational motion output by the servo motor 21 is transmitted to the lead screw 33 through the coupling 31, thereby driving the lead screw 33 to rotate.

[0014] The whole machine guiding mechanism 4 is located inside the frame 1; the whole machine guiding mechanism 4 includes a linear guide rail 41 and a slider 42; the linear guide rail 41 is fixed inside the frame 1, and the slider 42 is connected to the moving crossbeam 5; when the double-sided screw transmission mechanism 3 drives the moving crossbeam 5 to move up and down, the slider 42 slides synchronously along the linear guide rail 41, thereby guiding and constraining the movement direction of the moving crossbeam 5.

[0015] The moving crossbeam 5 is located in the middle working area of ​​the frame 1, and its left and right sides are connected to the left and right nut seats 34 respectively. When the two servo motors 21 run synchronously, the moving crossbeam 5 can rise and fall in the vertical direction under the combined action of the double-sided screw transmission mechanism 3.

[0016] The ultrasonic vibration mechanism 6 is mounted on the moving crossbeam 5. The ultrasonic vibration mechanism 6 includes an ultrasonic transducer 61, a mounting flange 62, an amplitude transformer 63, and a tool head 64. After the ultrasonic transducer 61 is connected to an external ultrasonic power supply, it is used to convert the input electrical signal into high-frequency mechanical vibration. The mounting flange 62 is used to fix the ultrasonic vibration mechanism 6 on the moving crossbeam 5. The amplitude transformer 63 is used to transmit vibration. The tool head 64 is located at the lower end of the amplitude transformer 63. During operation, the high-frequency mechanical vibration generated by the ultrasonic transducer 61 is transmitted downward to the punch 7 through the amplitude transformer 63 and the tool head 64, so that the punch 7 is superimposed with high-frequency vibration during the forming process.

[0017] The punch 7 is connected to the lower end of the ultrasonic vibration mechanism 6. As an upper forming component, the punch 7 moves downward in the vertical direction under the drive of the servo drive mechanism 2 and cooperates with the lower die 8 to apply a forming effect to the sheet metal. Since the punch 7 is connected to the ultrasonic vibration mechanism 6, the ultrasonic vibration is directly transmitted to the punch 7 through the tool head 64 during the forming process, so that the punch 7 is superimposed with high frequency vibration on the basis of static load.

[0018] The concave mold 8 is installed on the mold base 12; the concave mold 8 is located below the convex mold 7 and is arranged vertically and vertically corresponding to the convex mold 7.

[0019] A method for operating a servo motor-ultrasonic vibration composite stamping device for bipolar plate forming; the method includes: after the servo motor 21 outputs rotational motion, it is transmitted to the left and right lead screws 33 via the coupling 31, and the lead screws 33 rotate to move the nut seat 34 in the vertical direction; the nut seat 34 is connected to the moving crossbeam 5, and the moving crossbeam 5 and the ultrasonic vibration mechanism 6 and the punch 7 on it rise or fall accordingly; during the movement, the whole machine guide mechanism 4 guides and constrains the moving crossbeam 5; when the ultrasonic vibration mechanism 6 is activated, high-frequency mechanical vibration is transmitted to the punch 7 along the amplitude transformer 63 and the tool head 64, so that the punch 7 is superimposed with axial high-frequency vibration on the basis of static load; the sheet material is located between the punch 7 and the die 8, and gradually undergoes plastic deformation and forms the target structure during the downward movement of the punch 7.

[0020] A bipolar plate forming test method includes: first, installing the corresponding punch 7 and die 8 according to the test requirements, and adjusting the relative positions of the punch 7 and die 8 to make them in a suitable working state; then, checking the installation status of the servo motor 21, lead screw 33, nut seat 34, whole machine guide mechanism 4 and ultrasonic vibration mechanism 6 to confirm whether the device is in an operational state.

[0021] After confirming that the device is in an operational state, the metal sheet to be formed is placed in the corresponding area of ​​the die 8. The control system starts two servo motors 21, which synchronously drive the lead screws 33 on both sides to rotate, causing the nut seat 34 to move vertically, which in turn drives the moving beam 5 and its ultrasonic vibration mechanism 6 and punch 7 to move vertically downward. As the punch 7 moves downward, the sheet gradually enters between the punch 7 and the die 8 and enters the forming stage. The ultrasonic vibration mechanism 6 is started as needed to make the punch 7 obtain axial high-frequency vibration. At this time, the sheet gradually undergoes plastic deformation between the punch 7 and the die 8 to form the shape required for the bipolar plate. When the predetermined stroke or predetermined forming state is reached, the control system stops the downward pressing action, and then controls the servo motors 21 to run in reverse, causing the moving beam 5 to drive the punch 7 to move upward, realizing the mold opening. Finally, the formed workpiece is taken out to complete the test.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] This invention uses dual servo motors to drive a double-sided lead screw mechanism to move the moving crossbeam and punch in the vertical direction, which facilitates the adjustment of displacement, speed and action sequence during the forming process. It is suitable for parameter setting and process control in bipolar plate forming tests.

[0024] This invention introduces ultrasonic vibration into the bipolar plate stamping process, causing the punch to superimpose high-frequency vibration during the pressing process, which helps to reduce the forming force and provides a device basis for studying the influence of ultrasonic vibration on the bipolar plate forming process.

[0025] This invention combines a servo drive structure, an ultrasonic vibration mechanism, a punch, and a die into a single device, which facilitates bipolar plate forming and ultrasonic-assisted forming related experiments, and is applicable to process parameter adjustment and forming process research. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective;

[0028] Figure 3 This is a schematic diagram of the frame and double-sided lead screw transmission mechanism of the present invention;

[0029] Figure 4 This is a schematic diagram of the moving crossbeam, the overall guiding mechanism, and the ultrasonic vibration mechanism of the present invention;

[0030] Figure 5 This is a schematic diagram of the ultrasonic vibration mechanism of the present invention;

[0031] Figure 6This is a schematic diagram of the relative arrangement of the punch and die of the present invention.

[0032] The attached diagram shows the following reference numerals: 1. Frame; 11. Base; 12. Mold base; 13. Left column; 14. Right column; 15. Top beam; 2. Servo drive mechanism; 21. Servo motor; 3. Double-sided lead screw transmission mechanism; 31. Coupling; 32. Bearing support; 33. Lead screw; 34. Nut seat; 4. Overall guiding mechanism; 41. Linear guide rail; 42. Slider; 5. Moving beam; 6. Ultrasonic vibration mechanism; 61. Ultrasonic transducer; 62. Mounting flange; 63. Amplitude rod; 64. Tool head; 7. Punch; 8. Die; Mold guiding and positioning structure; 101. Positioning guide post; 102. Guide sleeve. Detailed Implementation

[0033] The present invention is further described below through specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0034] like Figure 1-6 As shown, this invention discloses a servo motor-ultrasonic vibration composite stamping device for bipolar plate forming, comprising: a frame 1, a servo drive mechanism 2, a double-sided lead screw transmission mechanism 3, a whole machine guide mechanism 4, a moving crossbeam 5, an ultrasonic vibration mechanism 6, a punch 7, a die 8, and a control system (not shown in the figure); the control system is used to control the operating status of the servo drive mechanism and the working parameters of the ultrasonic vibration mechanism.

[0035] The frame 1 adopts a portal frame structure, including a base 11, a mold base 12, a left column 13, a right column 14, and a top beam 15; the mold base 12 is set on the base 11 and is used to install the die 8; the left column 13 and the right column 14 are set on both sides of the base 11; the top beam 15 is connected to the upper ends of the left column 13 and the right column 14.

[0036] The portal frame structure formed by the frame 1 provides a mounting base for the servo drive mechanism 2, the double-sided lead screw transmission mechanism 3, the whole machine guide mechanism 4, the motion crossbeam 5, the ultrasonic vibration mechanism 6, and the punch 7 and die 8.

[0037] The dual-sided lead screw transmission mechanism 3 is respectively disposed on the left and right sides of the frame 1. Each side includes a coupling 31, a bearing support 32, a lead screw 33, and a nut seat 34. The lead screw 33 is vertically arranged on the left and right sides of the frame 1 and is mounted on the frame 1 through the bearing support 32. The lead screw 33 and the nut seat 34 are threadedly engaged. When the drive mechanism 2 drives the lead screw 33 to rotate, the nut seat 34 moves along the axial direction of the lead screw 33. The left and right nut seats 34 are respectively connected to the moving crossbeam 5, thereby converting the rotational motion of the drive mechanism 2 into the up-and-down linear motion of the moving crossbeam 5. The lead screw 33 can be a ball screw.

[0038] The servo drive mechanism 2 includes two servo motors 21, one on the left and one on the right, respectively mounted above the top crossbeam 15. The output of each servo motor 21 is connected to a corresponding lead screw 33 via a coupling 31. The rotational motion output by the servo motor 21 is transmitted to the lead screw 33 via the coupling 31, thereby driving the lead screw 33 to rotate. The main function of the servo drive mechanism 2 is to provide adjustable driving force for the device, facilitating speed and displacement adjustment of the punch 7's movement.

[0039] The overall guiding mechanism 4 is located inside the frame 1. The overall guiding mechanism 4 includes a linear guide rail 41 and a slider 42. The linear guide rail 41 is fixed inside the frame 1, and the slider 42 is connected to the moving crossbeam 5. When the double-sided screw transmission mechanism 3 drives the moving crossbeam 5 to move up and down, the slider 42 slides synchronously along the linear guide rail 41, thereby guiding and constraining the movement direction of the moving crossbeam 5. The main function of the overall guiding mechanism 4 is to reduce the possibility of deviation or swaying of the moving crossbeam 5 during lifting and lowering, ensuring it moves in a predetermined direction.

[0040] The moving crossbeam 5 is located in the middle working area of ​​the frame 1, and its left and right sides are connected to the left and right nut seats 34 respectively. When the two servo motors 21 run synchronously, the moving crossbeam 5 can move up and down in the vertical direction under the combined action of the double-sided screw transmission mechanism 3. The moving crossbeam 5 is an important load-bearing component connecting the double-sided screw transmission mechanism 3, the whole machine guide mechanism 4, the ultrasonic vibration mechanism 6 and the punch 7. Its main function is to support the upper forming mechanism and drive the punch 7 to move up and down as a whole under the action of servo drive.

[0041] The ultrasonic vibration mechanism 6 is mounted on the moving crossbeam 5. The ultrasonic vibration mechanism 6 includes an ultrasonic transducer 61, a mounting flange 62, an amplitude transformer 63, and a tool head 64. The ultrasonic transducer 61, after being connected to an external ultrasonic power supply, converts the input electrical signal into high-frequency mechanical vibration. The mounting flange 62 is used to fix the ultrasonic vibration mechanism 6 to the moving crossbeam 5. The amplitude transformer 63 is used to transmit vibration. The tool head 64 is located at the lower end of the amplitude transformer 63; in this embodiment, the amplitude transformer 63 and the tool head 64 are an integral structure. During operation, the high-frequency mechanical vibration generated by the ultrasonic transducer 61 is transmitted downwards to the punch 7 via the amplitude transformer 63 and the tool head 64, causing the punch 7 to superimpose high-frequency vibration during the forming process.

[0042] The punch 7 is connected to the lower end of the ultrasonic vibration mechanism 6. As an upper forming component, the punch 7 moves downward in the vertical direction under the drive of the servo drive mechanism 2 and cooperates with the lower die 8 to apply a forming effect to the sheet metal. Since the punch 7 is connected to the ultrasonic vibration mechanism 6, the ultrasonic vibration is directly transmitted to the punch 7 through the tool head 64 during the forming process, so that the punch 7 is superimposed with high frequency vibration on the basis of static load.

[0043] The die 8 is mounted on the die base 12; the die 8 is located below the punch 7 and is positioned vertically corresponding to the punch 7. The main function of the die 8 is to support the sheet metal to be formed and, together with the punch 7 above, form the deformation area required for bipolar plate stamping. Before forming, the sheet metal is placed in the area above the die 8. During forming, as the punch 7 moves downward, the sheet metal gradually enters between the punch 7 and the die 8, and undergoes plastic deformation under the combined action of the two.

[0044] As another embodiment, the present invention can also be equipped with a conventional mold guiding and positioning structure. The mold guiding and positioning structure includes positioning guide posts 101 disposed on both sides or at the four corners of the die 8, and guide holes or guide sleeves 102 disposed in parts that move synchronously with the punch 7. The positioning guide posts 101 are fixed to the mold base 12 where the die 8 is located and are situated outside the forming area of ​​the die 8; the guide holes or guide sleeves 102 are disposed in parts that move synchronously with the punch 7. During mold closing, as the moving beam 5 drives the punch 7 downward, the positioning guide posts 101 first enter the guide holes or guide sleeves 102, thereby guiding the relative position of the punch 7 and the die 8. This structure mainly plays an auxiliary role in the present invention. The punch 7 and the die 8 can be disassembled and replaced to adapt to forming tests of different bipolar plate structures.

[0045] The control system is connected to both the servo drive mechanism 2 and the ultrasonic vibration mechanism 6, and is used to control the operation of the entire device. The control system can be used to control the start, stop, synchronous operation, and reverse operation of the two servo motors 21, and also to control the start and stop of the ultrasonic vibration mechanism 6. Furthermore, the control system can be used to adjust parameters such as motion displacement, running speed, holding time, and ultrasonic loading timing. Although the control system is not drawn separately in the existing mechanical drawings, its role as an external electrical control component does not affect the mechanical structure representation of this invention.

[0046] The operation process of the servo motor-ultrasonic vibration composite stamping device of the present invention is as follows:

[0047] The servo drive mechanism 2 drives the double-sided lead screw transmission mechanism 3 to move, causing the moving crossbeam 5 to move the ultrasonic vibration mechanism 6 and the punch 7 in the vertical direction. At the same time, the ultrasonic vibration mechanism 6 applies high-frequency vibration to the punch 7, so that the sheet metal is stamped with ultrasonic assistance between the punch 7 and the die 8. Specifically, after the servo motor 21 outputs rotational motion, it is transmitted to the left and right lead screws 33 through the coupling 31. The rotation of the lead screws 33 causes the nut seat 34 to move in the vertical direction. The nut seat 34 is connected to the moving crossbeam 5, and the moving crossbeam 5 and the ultrasonic vibration mechanism 6 and the punch 7 on it rise or fall accordingly. During the movement, the whole machine guide mechanism 4 guides and constrains the moving crossbeam 5. When the ultrasonic vibration mechanism 6 is activated, the high-frequency mechanical vibration is transmitted to the punch 7 along the amplitude rod 63 and the tool head 64, so that the punch 7 is superimposed with axial high-frequency vibration on the basis of static load. The sheet metal is located between the punch 7 and the die 8, and gradually undergoes plastic deformation and forms the target structure during the downward movement of the punch 7.

[0048] When using the device of the present invention to conduct bipolar plate forming tests, firstly, install the corresponding punch 7 and die 8 according to the test requirements, and adjust the relative positions of punch 7 and die 8 to make them in a suitable working state; then, check the installation status of servo motor 21, lead screw 33, nut seat 34, whole machine guide mechanism 4 and ultrasonic vibration mechanism 6 to confirm whether the device is in an operational state.

[0049] After confirming the device is operational, the metal sheet to be formed is placed in the corresponding area of ​​the die 8. The control system activates two servo motors 21, which synchronously rotate the lead screws 33 on both sides, causing the nut seat 34 to move vertically. This, in turn, drives the moving beam 5, its ultrasonic vibration mechanism 6, and the punch 7 to move vertically downwards. As the punch 7 moves downwards, the sheet gradually enters the space between the punch 7 and the die 8 and enters the forming stage. The ultrasonic vibration mechanism 6 is activated as needed to give the punch 7 axial high-frequency vibration. At this time, the sheet gradually undergoes plastic deformation between the punch 7 and the die 8, forming the desired shape of the bipolar plate. When the predetermined stroke or predetermined forming state is reached, the control system stops the downward pressing action, and can hold the current position briefly if necessary. Then, the servo motors 21 are reversed, causing the moving beam 5 to move the punch 7 upwards, thus opening the die. Finally, the formed workpiece is removed, completing the test. The next test can be conducted according to the test requirements, or the test can be repeated after adjusting the process parameters.

[0050] Those skilled in the art will readily understand that the above description is merely an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A servo motor-ultrasonic vibration composite stamping device for bipolar plate forming, characterized in that, include: The machine frame (1), servo drive mechanism (2), double-sided lead screw transmission mechanism (3), whole machine guide mechanism (4), motion crossbeam (5), ultrasonic vibration mechanism (6), punch (7), die (8) and control system; The frame (1) adopts a portal frame structure, including a base (11), a mold base (12), a left column (13), a right column (14) and a top beam (15); the mold base (12) is set on the base (11) and is used to install the die (8); the left column (13) and the right column (14) are set on both sides of the base (11); the top beam (15) is connected to the upper end of the left column (13) and the right column (14); The portal frame structure formed by the frame (1) is used to provide a mounting base for the servo drive mechanism (2), the double-sided lead screw transmission mechanism (3), the whole machine guide mechanism (4), the motion beam (5), the ultrasonic vibration mechanism (6), and the punch (7) and die (8).

2. The servo motor-ultrasonic vibration composite stamping device for bipolar plate forming according to claim 1, characterized in that, The double-sided screw drive mechanism (3) is respectively set on the left and right sides of the frame (1), and each side includes a coupling (31), a bearing support (32), a screw (33) and a nut seat (34). The lead screw (33) is vertically arranged on the left and right sides of the frame (1) and is installed on the frame (1) through the bearing support (32); the lead screw (33) is threadedly engaged with the nut seat (34). When the drive mechanism (2) drives the lead screw (33) to rotate, the nut seat (34) moves along the axial direction of the lead screw (33); the left and right nut seats (34) are respectively connected to the moving crossbeam (5), thereby converting the rotational motion of the drive mechanism (2) into the vertical linear motion of the moving crossbeam (5).

3. The servo motor-ultrasonic vibration composite stamping device for bipolar plate forming according to claim 1, characterized in that, The servo drive mechanism (2) includes two servo motors (21) on the left and right sides respectively, which are installed on the left and right sides above the top crossbeam (15); the output end of each servo motor (21) is connected to the corresponding lead screw (33) through a coupling (31); the rotational motion output by the servo motor (21) is transmitted to the lead screw (33) through the coupling (31), thereby driving the lead screw (33) to rotate.

4. The servo motor-ultrasonic vibration composite stamping device for bipolar plate forming according to claim 1, characterized in that, The whole machine guide mechanism (4) is located inside the frame (1); the whole machine guide mechanism (4) includes a linear guide rail (41) and a slider (42). The linear guide rail (41) is fixed inside the frame (1), and the slider (42) is connected to the moving beam (5). When the double-sided screw transmission mechanism (3) drives the moving beam (5) to move up and down, the slider (42) slides synchronously along the linear guide rail (41), thereby guiding and constraining the movement direction of the moving beam (5).

5. The servo motor-ultrasonic vibration composite stamping device for bipolar plate forming according to claim 1, characterized in that, The moving crossbeam (5) is located in the middle working area of ​​the frame (1), and its left and right sides are connected to the left and right nut seats (34) respectively. When the two servo motors (21) run synchronously, the moving crossbeam (5) can rise and fall in the vertical direction under the combined action of the double-sided screw transmission mechanism (3).

6. The servo motor-ultrasonic vibration composite stamping device for bipolar plate forming according to claim 5, characterized in that, The ultrasonic vibration mechanism (6) is mounted on the moving crossbeam (5); the ultrasonic vibration mechanism (6) includes an ultrasonic transducer (61), a mounting flange (62), an amplitude transformer (63), and a tool head (64); after the ultrasonic transducer (61) is connected to an external ultrasonic power supply, it is used to convert the input electrical signal into high-frequency mechanical vibration; the mounting flange (62) is used to fix the ultrasonic vibration mechanism (6) on the moving crossbeam (5); the amplitude transformer (63) is used to transmit vibration; the tool head (64) is located at the lower end of the amplitude transformer (63); during operation, the high-frequency mechanical vibration generated by the ultrasonic transducer (61) is transmitted downward to the punch (7) through the amplitude transformer (63) and the tool head (64), so that the punch (7) is superimposed with high-frequency vibration during the forming process.

7. The servo motor-ultrasonic vibration composite stamping device for bipolar plate forming according to claim 6, characterized in that, The punch (7) is connected to the lower end of the ultrasonic vibration mechanism (6); the punch (7) is the upper forming component, and moves downward in the vertical direction under the drive of the servo drive mechanism (2), and cooperates with the lower die (8) to apply forming action to the sheet metal; since the punch (7) is connected to the ultrasonic vibration mechanism (6), during the forming process, the ultrasonic vibration is directly transmitted to the punch (7) through the tool head (64), so that the punch (7) is superimposed with high frequency vibration on the basis of static load.

8. The servo motor-ultrasonic vibration composite stamping device for bipolar plate forming according to claim 6, characterized in that, The die (8) is mounted on the die base (12); the die (8) is located below the punch (7) and is positioned vertically and vertically corresponding to the punch (7).

9. The method of operating the servo motor-ultrasonic vibration composite stamping device for bipolar plate forming according to any one of claims 1-8, characterized in that... The operation method includes: after the servo motor (21) outputs rotational motion, it is transmitted to the left and right lead screws (33) via the coupling (31). The lead screws (33) rotate to make the nut seat (34) move in the vertical direction. The nut seat (34) is connected to the moving beam (5). The moving beam (5) and the ultrasonic vibration mechanism (6) and punch (7) on it rise or fall accordingly. During the movement, the whole machine guide mechanism (4) guides and constrains the moving beam (5). When the ultrasonic vibration mechanism (6) is turned on, the high-frequency mechanical vibration is transmitted to the punch (7) along the amplitude rod (63) and the tool head (64), so that the punch (7) is superimposed with axial high-frequency vibration on the basis of static load. The sheet material is located between the punch (7) and the die (8). During the downward movement of the punch (7), it gradually undergoes plastic deformation and forms the target structure.

10. A bipolar plate forming test method, characterized in that... The servo motor-ultrasonic vibration composite stamping device for bipolar plate forming as described in any one of claims 1-8 is used; the implementation steps include: First, install the corresponding punch (7) and die (8) according to the test requirements, and adjust the relative positions of the punch (7) and die (8) to make them in a suitable working state; then, check the installation status of the servo motor (21), lead screw (33), nut seat (34), whole machine guide mechanism (4) and ultrasonic vibration mechanism (6) to confirm whether the device is in an operational state. After confirming that the device is in an operational state, place the metal sheet to be formed in the corresponding area of ​​the die (8); start two servo motors (21) through the control system, and the two servo motors (21) drive the left and right lead screws (33) to rotate synchronously, so that the nut seat (34) moves in the vertical direction, and then drives the moving beam (5) and its ultrasonic vibration mechanism (6) and punch (7) to move downward in the vertical direction; as the punch (7) moves downward, the sheet gradually enters between the punch (7) and the die (8) and enters the forming stage; start the ultrasonic vibration mechanism (6) as needed to make the punch (7) obtain axial high-frequency vibration; at this time, the sheet gradually undergoes plastic deformation between the punch (7) and the die (8) to form the shape required for the bipolar plate; when the predetermined stroke or predetermined forming state is reached, the control system stops the pressing action; then control the servo motor (21) to run in reverse, so that the moving beam (5) drives the punch (7) to move upward to realize the mold opening; finally, take out the formed workpiece and complete the test.

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