CN112974642B - Electrically-assisted forming device and process for metal polar plate of fuel cell - Google Patents
Electrically-assisted forming device and process for metal polar plate of fuel cell Download PDFInfo
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- CN112974642B CN112974642B CN202110175962.0A CN202110175962A CN112974642B CN 112974642 B CN112974642 B CN 112974642B CN 202110175962 A CN202110175962 A CN 202110175962A CN 112974642 B CN112974642 B CN 112974642B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
- B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0206—Metals or alloys
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention relates to an electric auxiliary forming device and process for a fuel cell metal polar plate, which comprises a power supply, a forming die, a metal sheet to be formed, a sensor and the like. By installing the sample in the forming die and connecting the sample with a power supply, the joule heat and the electro-plastic effect generated by current are utilized to promote the plastic flow of metal and reduce the flow stress, and further the precise forming of the polar plate is realized under the action of the die. Compared with the prior art, the invention can effectively reduce the residual stress of sheet forming and inhibit uneven resilience by controlling the parameters such as the size, the frequency, the acting time and the like of the current, solves the problems of easy cracking, low precision, poor consistency, whole plate warping and the like of the large-scale micro-channel structure forming of the metal polar plate, and improves the manufacturing quality of the metal polar plate of the fuel cell. The device has simple structure, can be combined with various basic forming processes, has strong expandability, is easy to adjust process parameters, has the advantages of high efficiency, low cost, obvious improvement of forming limit height and precision and the like, and is suitable for large-batch high-precision forming and manufacturing of the metal polar plates of the fuel cells.
Description
Technical Field
The invention relates to the field of manufacturing of key components of a fuel cell metal polar plate, in particular to an electric auxiliary forming device and process of the fuel cell metal polar plate.
Background
In recent years, hydrogen is regarded as one of the most promising energy sources to replace fossil fuels due to its advantages of being renewable, nearly zero-emission, and the like as a new energy source. Proton Exchange Membrane Fuel Cells (PEMFCs), as a hydrogen energy conversion device, have a wide development prospect due to their advantages of low noise, low operating temperature, high power density, etc., and have been successfully used in the fields of portable power generation equipment, automobiles, unmanned aerial vehicles, etc.
The bipolar plate is one of the key components of the PEMFC, plays a plurality of roles of collecting current and conducting, managing water heat, separating oxidant and reducing agent and the like in a fuel cell, and must meet the comprehensive performance requirements of corrosion resistance, electric conduction, easy processing, long service life and the like. The bipolar plates currently used mainly include metal bipolar plates, graphite-based bipolar plates, and the like. The ultrathin metal bipolar plate has the advantages of light weight, good conductivity, suitability for mass production, low cost and the like, and has wide development prospect.
The precise formation of the ultra-thin metal polar plate is one of the important links restricting the development of the metal bipolar plate. At present, the metal polar plate produced by adopting the stamping technology faces a plurality of problems: firstly, the micro-channel on the surface of the bipolar plate has complex characteristics, severe plastic deformation and large difference of residual stress in different areas, and the problem of uneven resilience is serious when stamping production is adopted, so that the forming consistency of micro-characteristics is poor, and the rejection rate and the production cost of the production are increased; secondly, the metal pole plate is limited by the flowing property of the metal material, the formability is often insufficient, the limit forming height is limited, and the further improvement of the power density of the fuel cell is restricted; thirdly, the size of the metal bipolar plate is increasing, the required forming force is also increasing, the requirement on the press is increasing, and the processing beat is long and the cost is high. Due to these problems, there is a need for a method of manufacturing a high-precision metal bipolar plate for a fuel cell that is efficient, simple, and inexpensive.
On the other hand, electrically assisted molding has attracted increasing attention in recent years as an emerging assisted molding process. The process changes the mechanical properties of the material in a short time by applying current to the metal material to be processed. The existing research finds that the process can obviously reduce the flow stress of the material in the forming process, inhibit the rebound of the formed material and improve the formability of the material, thereby improving the forming quality of the material. Based on this, the electrically assisted process has been applied to various forming processes such as drawing, bending, rolling, stamping, and the like.
When the electric assist technology is applied to the forming process of the metal bipolar plate, the springback after forming can be inhibited, the formability of the material can be improved, and the required forming force can be reduced, so that the forming precision and the yield of the metal bipolar plate can be improved, and the whole manufacturing cost can be reduced. However, the related patent is not found in the aspect.
The retrieval shows that the Chinese patent publication numbers are as follows: CN110534765A, name: a method for forming a high-precision metal bipolar plate required by a fuel cell comprises the following steps: selecting a bipolar plate raw material; designing and manufacturing a die 1 for punch forming of the bipolar plate and a die 2 for punch forming of the bipolar plate; pre-stamping and forming; complete punch forming; punching and cutting; and welding to obtain the bipolar plate. However, the technology does not consider that the bipolar plate has large resilience and serious warpage in multi-step forming, needs a plurality of sets of dies and has high production cost.
And the Chinese patent publication numbers are found as follows through retrieval: CN102013494A, name: the electromagnetic forming device comprises an upper template, a coil, a driving sheet, a mould, a lower template and a fastening bolt, and the method is characterized in that a strong pulse magnetic field is excited by discharging to the coil, and the transient strong pulse magnetic field generates an induced eddy current on the surface of the driving sheet so as to generate a magnetic field opposite to the direction of the magnetic field of the coil; under the repulsive force among the magnetic fields, the driving sheet drives the plate blank to do die-sticking motion towards the die. However, this technique does not take into account the complexity of the adjustment of the electromagnetic forming device, the requirements on the equipment are high, and the forming process is difficult to control.
Through the research of the literature, the Chinese patent publication numbers are: CN105161731A, name: a superplastic forming device and process for a proton exchange membrane fuel cell metal polar plate comprises the following steps: the device comprises a plate, a guide sleeve, a spring, a guide pillar, a pressure applying rod, an environment box, an upper template, a lower template, a base, a connecting plate, a side pressing plate, a metal plate and a support rod. The process implemented with the device: (1) opening an environment box; (2) fixing the metal sheet of the workpiece on the lower template; (3) Closing the environment box, determining the superplastic forming degree according to the processed plate and inputting the superplastic forming degree into a control system; (4) Setting the stroke and the movement rate of the upper template according to the superplastic strain rate and the flow channel shape of the processed plate; (5) Starting a circuit system and an environment box, and starting a pressure forming machine to move downwards to complete stamping; (6) starting the upper die plate of the press to reversely return to the initial position; and (7) opening the environment box, and cooling and taking out the formed piece. However, this technique does not consider that the production efficiency of superplastic forming is low and the required cost is high.
Disclosure of Invention
The invention aims to provide an electric auxiliary forming device and a process for a fuel cell metal polar plate, which have high production efficiency and wide application range and are simple and easy to adjust.
The purpose of the invention can be realized by the following technical scheme: an electrically-assisted forming device for a metal polar plate of a fuel cell comprises a power supply, a forming die, a metal sheet to be formed, a sensor and the like. The metal sheet to be formed is connected with a power supply, and the metal sheet is softened by utilizing the electro-plasticity and the thermal effect generated by the current and is formed under the action of a forming die.
Furthermore, the power supply can output direct current and alternating current with any waveform, the current amplitude is 0-1000A, the duty ratio is 0.01-100%, the frequency is 1Hz-10kHz, and the acting time is 0-300s, so that the current required by the accurate forming of the metal bipolar plate is provided.
Furthermore, the method for connecting the metal sheet to be formed with a power supply comprises the following steps: 1) The metal sheet is fixed on the guide plate and then placed in the forming die, and the guide plate is connected with a power supply through a lead, so that the current output by the lead uniformly acts on the metal sheet, and the surface oxidation caused by local overheating is prevented. Furthermore, one end of the guide plate is connected with the lead, the other end of the guide plate is an opening end, the width of the guide plate is uniformly increased from the end of the lead to the opening end, and the width of the opening end is larger than or equal to the width of the metal sheet. The metal sheet is inserted into the guide plate from the opening end, and the guide plate and the metal sheet are fixed through the fastening structure. The current that the wire transmitted realizes the evenly distributed of current on its sheet metal through the guide plate, evenly passes through the open end and evenly passes through to the sheet metal, guarantees that the current density that passes through everywhere on the sheet metal is even to prevent the surface oxidation that local overheat caused. 2) The power supply can also be directly connected with the forming die through a lead, and the forming die is contacted with the metal sheet in the forming process, so that the current transmitted by the lead is uniformly transferred to the metal sheet.
Furthermore, a current sensor is arranged on the lead to monitor the waveform information of the output current in the electric auxiliary forming process in real time.
The forming die comprises an upper die and a lower die, the upper die and the lower die are positioned by adopting a guide pillar and a guide sleeve, the upper die and the lower die are matched with a current applying process, an acting force is applied to a to-be-formed metal sheet to realize the plastic forming of a metal polar plate, and the current applying process is carried out before the upper die and the lower die are combined, in the die combining process and after the die is combined, or in any two combination of the upper die and the lower die or in the whole process.
Furthermore, the upper die and the lower die are respectively composed of a die frame, a die holder and a die core, wherein the die core is any one of forming dies such as a rigid stamping die and a rubber soft die.
Furthermore, contact or non-contact temperature sensors are arranged inside the forming die to acquire temperature data of different areas.
The invention also provides a process of the electric auxiliary forming device adopting the fuel cell metal polar plate, which comprises the following steps:
(1) Placing a metal sheet between the upper die and the lower die and connecting the metal sheet with a power supply through a guide plate or a forming die;
(2) Before, during and after the forming die is molded, and in any two combination or the whole process of the forming die, the current density, the frequency, the duty ratio and the acting time of a power supply are adjusted, a current action is applied to the metal sheet, the ductility of the material is improved, the flow stress, the residual stress and uneven resilience of the material are reduced by using the joule heat and the electro-plastic effect generated by the current, the forming force of a polar plate is reduced, and the forming depth, the processing precision and the consistency are improved;
(3) And in cooperation with the current application process, acting force is applied to the metal sheet through the upper die and the lower die to realize plastic forming of the metal pole plate.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, current is introduced into the forming process of the metal bipolar plate, the formability of the metal sheet is improved by using the joule heat and the electro-plastic effect, the required forming force is reduced, the stamping resilience and the residual stress are inhibited, and the forming height, the precision, the consistency and the flatness of the whole plate are improved;
2. the invention combines devices such as a current sensor, a temperature sensor, a guide plate and the like, and improves the forming precision of the metal bipolar plate on the premise of ensuring the surface quality;
3. the invention adopts the guide plate to conduct current to the metal sheet, so that the current output by the lead is uniformly transferred to the metal sheet, and the forming defects of surface oxidation, adhesion and the like caused by local overheating are avoided.
4. The invention has high production efficiency, wide application range, simple and easy adjustment, can be combined with various basic forming processes, and meets the precise forming requirements of fuel cell metal polar plates with different materials and different thicknesses.
5. The invention reduces the required forming force, inhibits the forming rebound, reduces the residual stress, improves the material formability, solves the problems of easy cracking, low forming precision, poor consistency, whole plate warping and the like of the large-scale micro-channel structure of the metal bipolar plate by controlling the parameters of the current such as the size, the frequency, the acting time and the like and utilizing the current joule heat and the electro-plastic effect, and improves the manufacturing quality of the metal polar plate of the fuel cell. The device has simple structure, can be combined with various basic forming processes, has strong expandability, easily adjusts process parameters, has the advantages of high production efficiency, low cost, high forming precision and the like, and is suitable for large-batch high-precision forming of the metal polar plates of the fuel cells.
Drawings
FIG. 1 is an overall schematic view of the present invention;
FIG. 2 is an overall front view of the present invention;
FIG. 3 is a top view of the lower forming die, power supply, wires, etc. of the present invention;
FIG. 4 is a schematic view of a baffle of the present invention;
FIG. 5 is a schematic view of a mold core, wires, a power supply, etc. in embodiment 4 of the present invention;
in the figure: 1-a power supply; 2-guide sleeve; 3-a wire; 4-guide column; 5-a spring; 6-lower die carrier; 7-a lower die holder; 8-lower mold core; 9-a metal sheet; 10-mounting a mould frame; 11-an upper die holder; 12-upper mold core; 13-a current sensor; 14-a temperature sensor; 15-a baffle; 16-bolt; 17-nut.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
Referring to fig. 1 to 4, the electrically assisted forming device for a metal plate of a fuel cell according to the present invention includes a power supply 1, a forming mold, a lead 3, a baffle 15, a metal sheet 9, a current sensor 13, a temperature sensor 14, etc.;
the forming die comprises an upper die and a lower die, wherein the upper die comprises an upper die frame 10, an upper die base 11 and an upper die core 12, the upper die core 12 is installed on the upper die base 11, and the upper die base 11 is installed on the upper die frame 10. The upper die frame 10 is connected with a press; the lower die comprises a lower die frame 6, a lower die base 7 and a lower die core 8, wherein the lower die base and the lower die core are sequentially arranged above the lower die frame, and the upper die core 12 is positioned right above the lower die core 8. A guide post 4 is fixed on the lower die frame 6, a spring 5 is sleeved on the guide post 4, the top of the guide post 4 is inserted into the guide sleeve 2 on the upper die frame 10, and the upper die moves up and down along the guide post under the driving of the press.
One end of the guide plate 15 is an open end, the width of the guide plate is larger than or equal to the width of the metal sheet 9, the metal sheet 9 is inserted into the guide plate 15 from the open end, the guide plate 15 is fixedly connected with the metal sheet 9 through a bolt 16 and a nut 17, and then the guide plate is arranged between the upper mold core 12 and the lower mold core 8.
The power supply 1 is connected with the guide plate 15 through the lead 3, so that the current output by the lead uniformly acts on the metal sheet and the surface oxidation caused by local overheating is prevented. The lead 3 is provided with a current sensor 13 for monitoring the waveform information of the output current in the electric auxiliary forming process in real time.
A contact type or non-contact type temperature sensor 14 is arranged in the inner part of the mold core of the forming mold to acquire temperature data of different areas and monitor the temperatures of the different areas in the electric auxiliary forming process in real time.
The method for processing the metal polar plate of the fuel cell by adopting the device comprises the following steps:
before the metal thin plate 9 is formed, the metal thin plate 9 is firstly fastened on the deflector 15 through a bolt 16 and a nut 17; the power supply 1 sets the required current density, frequency and duty ratio, the generated current is transmitted to a metal sheet 9 placed on a forming die through a lead 3 and a guide plate 15, and then the forming process is carried out; for a forming die, a lower die core 8 is connected with a lower die 6 through a lower die holder 7, an upper die core 12 is connected with an upper die frame 10 through an upper die holder 11, and the upper die and the lower die are quickly matched under the action of a press; the guide post 4 is matched with the guide sleeve 2, and the spring 5 provides supporting force; meanwhile, the current waveform is measured in real time through a current sensor 13, and the temperature of the metal sheet 9 is monitored in real time through a temperature sensor 14 fixed in the lower mold core 8; after the forming is finished, the power supply 1 is turned off, the upper die and the lower die are separated, and the formed metal sheet is taken out, so that the processing process of the microstructure on the surface of the metal sheet is finished.
For setting the output current parameters of the power supply, when a high-frequency square wave pulse power supply is selected, the requirement of meeting the effective current density (current density multiplied by duty ratio) 0.5 ) Greater than 30A/mm 2 . For a metal sheet with the width of 100mm and the thickness of 0.1mm, when a metal bipolar plate micro-channel with the groove width of 1.2mm and the height of 0.35mm is formed, the pulse current amplitude is 800A, the current duty ratio is 50%, the current frequency is 50Hz, and the action time is 1s. At this time, the current density was 800/(100 × 0.1) =80A/mm 2 The effective current density is 80 x 50% 0.5 ＝56.57A/mm 2 In the process, the temperature of the metal sheet is higher than 300 ℃, the surface profile of the formed metal bipolar plate micro-channel is measured by a laser confocal microscope, the height deviation among different grooves is less than 10 mu m, and better groove height consistency can be achieved.
Example 2
Referring to fig. 1 to 4, the electrically assisted forming device for a fuel cell metal plate according to the present invention is the same as that of embodiment 1, and the electrically assisted process can also shape the formed metal sheet after the forming is finished;
before the metal sheet is formed, the metal sheet 9 is firstly fastened on the deflector 15 through a bolt 16 and a nut 17; then, under the action of a press, the upper die and the lower die are quickly closed to finish the forming process; after the forming is finished, the required current density, frequency, duty ratio and action time are set in the power supply 1, and the generated current is transmitted to the metal sheet 9 placed on the forming die through the guide plate 15 by the lead 3 and acts for a given time; and then the power supply 1 is automatically closed, the upper die and the lower die are separated, and the formed metal sheet is taken out, so that the processing process of the fine structure on the surface of the metal sheet is completed.
Example 3
Referring to fig. 1 to 4, the electrically assisted forming device for a fuel cell metal plate according to the present invention can also perform soft mold stamping forming of a metal bipolar plate, similar to the first embodiment, except that the upper mold core 12 is replaced by a high temperature resistant rubber soft mold;
before the metal sheet is formed, the metal sheet 9 is firstly fastened on the deflector 15 through a bolt 16 and a nut 17; the power supply 1 sets the required current density, frequency and duty ratio, the generated current is transmitted to a metal sheet 9 placed on a forming die through a lead 3 and a guide plate 15, and then the forming process is carried out; for a forming die, a rigid lower die core 8 is connected with a lower die 6 through a lower die base 7, a rubber soft die core upper die core 12 is connected with an upper die frame 10 through an upper die base 11, and the rigid lower die core 8 and the rubber soft die core upper die core 12 complete die assembly under the action of a press; the guide post 4 is matched with the guide sleeve 2, and the spring 5 provides supporting force; meanwhile, the current waveform is measured in real time through a current sensor 13, and the temperature of the metal sheet 9 is monitored in real time through a temperature sensor 14 fixed in the lower mold core 8; after the forming is finished, the power supply 1 is turned off, the upper die and the lower die are separated, and the formed metal sheet is taken out, so that the processing process of the fine structure on the surface of the metal sheet is finished.
Example 4
Referring to fig. 5, in the electrically assisted forming apparatus for a metal plate of a fuel cell according to the present invention, the leads may also be connected to the upper and lower dies, respectively, and the current passes through the leads and the upper and lower dies from the power source to act on the metal sheet, similar to the first embodiment, the difference is that the guide plate 15, the bolt 16, and the nut 17 are removed, and the lead 3 is directly connected to the upper die core 12 and the lower die core 8, respectively;
before the metal sheet is formed, a power supply 1 sets required current density, frequency and duty ratio, generated current is transmitted to the metal sheet 9 through a conducting wire 3 and an upper die core 12 and a lower die core 8 respectively, and then the forming process is carried out; for a forming die, a lower die core 8 is connected with a lower die 6 through a lower die holder 7, an upper die core 12 is connected with an upper die frame 10 through an upper die holder 11, and the upper die and the lower die are quickly matched under the action of a press; the guide post 4 is matched with the guide sleeve 2, and the spring 5 provides supporting force; meanwhile, the current waveform is measured in real time through a current sensor 13, and the temperature of the metal sheet 9 is monitored in real time through a temperature sensor 14 fixed in the lower mold core 8; after the forming is finished, the power supply 1 is turned off, the upper die and the lower die are separated, and the formed metal sheet is taken out, so that the processing process of the fine structure on the surface of the metal sheet is finished.
The scope of the present invention should be determined by the following claims, and is intended to include all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (7)
1. An electrically-assisted forming device for a metal polar plate of a fuel cell is characterized by comprising a power supply, a forming die and a metal sheet to be formed, wherein the metal sheet to be formed is connected with the power supply, the metal plastic flow is improved and the flow stress is reduced by utilizing the heat and electro-plastic effect generated by current, and then the metal polar plate is formed under the action of the forming die;
the power supply can output direct current and alternating current with any waveform, the current amplitude is 0-1000A, the duty ratio is 0.01-100%, the frequency is 1Hz-10kHz, the acting time is 0-300s, and the current required by the accurate forming of the metal polar plate is provided;
the mode that the metal sheet to be formed is connected with a power supply comprises the following steps:
the metal sheet is fixed on the guide plate and then placed in the forming die, the guide plate is connected with a power supply through a wire, so that the current output by the wire is uniformly applied to the metal sheet and surface oxidation caused by local overheating is prevented, one end of the guide plate is connected with the wire, the other end of the guide plate is an open end, the width of the guide plate is uniformly increased from the end of the wire to the open end, the width of the open end is larger than or equal to the width of the metal sheet, the metal sheet is inserted into the guide plate from the open end and is fixed with the metal sheet through a fastening structure, the current transmitted by the wire is uniformly distributed on the metal sheet through the guide plate and is uniformly transited to the metal sheet through the open end, the uniform density of the current passing through each part of the metal sheet is ensured, and therefore, the surface oxidation caused by local overheating is prevented;
or, the power supply is directly connected with the forming die through a lead, and the forming die is contacted with the metal sheet in the forming process, so that the current transmitted by the lead is uniformly transferred to the metal sheet.
2. The electrically assisted forming device for a metal plate of a fuel cell of claim 1, wherein the power supply outputs current through a lead, and the lead is provided with a current sensor for monitoring waveform information of the output current in the electrically assisted forming process in real time.
3. The electrically assisted forming device of a fuel cell metal plate of claim 1, characterized in that the forming mold comprises an upper mold and a lower mold, the upper mold and the lower mold are positioned by a guide pillar and a guide sleeve, and the upper mold and the lower mold are matched with a current applying process to apply force to the metal thin plate to be formed so as to realize plastic forming of the metal plate.
4. An electrically assisted forming apparatus for a metal plate of a fuel cell according to claim 3, wherein the current application process occurs before the upper and lower dies are closed, during the closing process, after the closing process, or any combination of two or all of the three processes.
5. The electrically assisted forming device of the fuel cell metal polar plate of claim 4, characterized in that the upper die and the lower die are both composed of a die frame, a die holder and a die core, wherein the die core is any one of a rigid stamping die and a soft rubber die.
6. The electrically assisted forming device for a metal plate of a fuel cell according to claim 1, wherein a contact type or non-contact type temperature sensor is arranged inside the forming die to collect temperature data of different areas.
7. A process for using the fuel cell metal plate electrically assisted forming apparatus of any of claims 1 to 6, comprising the steps of:
(1) Placing the metal sheet in a forming die and connecting a power supply;
(2) Before, during and after the forming die is molded, and in any two combination or the whole process of the forming die, adjusting the current density, the frequency, the duty ratio and the acting time of a power supply, and applying a current action to the metal sheet;
(3) And in cooperation with the current application process, the metal polar plate plastic forming is realized by applying acting force to the metal sheet through the forming die.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110175962.0A CN112974642B (en) | 2021-02-09 | 2021-02-09 | Electrically-assisted forming device and process for metal polar plate of fuel cell |
| PCT/CN2021/097642 WO2022170701A1 (en) | 2021-02-09 | 2021-06-01 | Electrically assisted forming device and process for fuel cell metal plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110175962.0A CN112974642B (en) | 2021-02-09 | 2021-02-09 | Electrically-assisted forming device and process for metal polar plate of fuel cell |
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| CN112974642A CN112974642A (en) | 2021-06-18 |
| CN112974642B true CN112974642B (en) | 2022-10-11 |
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| WO (1) | WO2022170701A1 (en) |
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| CN114309232B (en) * | 2021-12-27 | 2022-08-16 | 华中科技大学 | Micro-channel fillet correction device and method for metal plate |
| CN115133090B (en) * | 2022-09-01 | 2022-11-18 | 浙江晨阳新材料有限公司 | Stable shaping device and method for proton exchange membrane fuel cell |
| CN115832346B (en) * | 2022-12-12 | 2024-06-04 | 大连理工大学 | Fuel cell metal polar plate and manufacturing method thereof |
| CN116140478B (en) * | 2023-04-21 | 2023-09-15 | 昆明锐敏科技有限公司 | Split type formed hardware mold and forming process thereof |
| CN118321426B (en) * | 2024-06-13 | 2024-08-23 | 合肥工业大学 | Partitioned time-by-time type electric auxiliary forming device and process for hemispherical shell |
| CN118371583B (en) * | 2024-06-21 | 2024-09-03 | 合肥工业大学 | Metal plate electric auxiliary stamping forming device |
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