CN116278144B - Fuel cell graphite bipolar plate punching and die pressing integrated die and punching and die pressing method - Google Patents
Fuel cell graphite bipolar plate punching and die pressing integrated die and punching and die pressing method Download PDFInfo
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- CN116278144B CN116278144B CN202310595062.0A CN202310595062A CN116278144B CN 116278144 B CN116278144 B CN 116278144B CN 202310595062 A CN202310595062 A CN 202310595062A CN 116278144 B CN116278144 B CN 116278144B
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- 238000004080 punching Methods 0.000 title claims abstract description 46
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 42
- 239000010439 graphite Substances 0.000 title claims abstract description 42
- 239000000446 fuel Substances 0.000 title claims abstract description 21
- 238000007723 die pressing method Methods 0.000 title description 11
- 238000003825 pressing Methods 0.000 claims abstract description 81
- 238000000034 method Methods 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000000465 moulding Methods 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 19
- 238000000748 compression moulding Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 4
- 239000007770 graphite material Substances 0.000 abstract description 4
- 230000009471 action Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000005086 pumping Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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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
- H01M8/023—Porous and characterised by the material
- H01M8/0234—Carbonaceous material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
- B26F1/14—Punching tools; Punching dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/0005—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for briquetting presses
- B30B15/0017—Deairing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/0094—Press load monitoring means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/26—Programme control arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/32—Discharging presses
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Forests & Forestry (AREA)
- Fuel Cell (AREA)
Abstract
The application provides a punching and molding integrated die and a punching and molding method for a graphite bipolar plate of a fuel cell, wherein the punching and molding integrated die comprises an upper die, a punch, a pressing plate, a lower die core and a base; the punch is fixed at the bottom of the upper die; the pressing plate is in vertical movement connection with the upper die through a vertical movement assembly; the upper die and the lower die core form vertical movable connection through a through connecting piece; the lower die core comprises a female die, and the female die corresponds to the punch in position in the vertical direction; the lower mold core is detachably connected with the base; the lower mold core further comprises an elastic limiting piece, and the pre-pressing distance between the material pressing plate and the lower mold core in the punching process can be kept all the time. The application combines the punch and the pressing plate, adopts a mode of pre-punching and then forming, leads the punch to form Cheng Xianwei column at the port air passage after the punching is finished, and simultaneously effectively utilizes the fluidity of graphite material, thereby preventing the graphite bipolar plate from generating burrs at the port or the air passage in the process of mould pressing.
Description
Technical Field
The application relates to the technical field of fuel cells, in particular to a punching and molding integrated die for a graphite bipolar plate of a fuel cell and a punching and molding method.
Background
Graphite is a traditional bipolar plate material, and the graphite bipolar plate has good conductivity and corrosion resistance, but is limited by raw materials, and has the characteristics of high brittleness, high preparation and processing difficulty and high processing cost. In the prior art, the machining mode of the graphite bipolar plate comprises three modes of machining, injection molding and die pressing.
In the current industry, the extrusion process is adopted, which can cause the problem of burrs of the port or the air passage in the extrusion process, and due to the existence of the burrs, a special deburring process is required to be carried out later, and after bipolar plates are stacked, burrs are arranged to block the flow passage, so that leakage damage and other risks occur to the galvanic pile.
Disclosure of Invention
The integrated punching and molding die and the punching and molding method for the graphite bipolar plate of the fuel cell can break through the conventional thought, adopt a mode of pre-punching and post-molding, and effectively utilize the flowability of the graphite prefabricated plate material, so that burrs are prevented from being generated at a port or an air passage port in the process of molding the graphite bipolar plate, and the technical problems are solved.
The technical scheme for solving the technical problems is as follows:
in a first aspect, the present application provides a fuel cell graphite bipolar plate punch-die integrated die comprising: the device comprises an upper die, a punch, a pressing plate, a lower die core and a base;
the punch is fixed at the bottom of the upper die;
the pressing plate is in vertical movement connection with the upper die through a vertical movement assembly;
the upper die and the lower die core form vertical movable connection through a through connecting piece;
the lower die core comprises a female die, and the female die corresponds to the punch in position in the vertical direction;
the lower mold core is detachably connected with the base;
the lower die core further comprises an elastic limiting piece, and the elastic limiting piece can enable the pre-pressing distance between the material pressing plate and the lower die core to be kept all the time in the punching process;
the base includes: the ejector pin, the air hole, the air passage and the air pipe joint;
the ejector pin is arranged at the top of the air hole, and the top of the ejector pin can extend into the female die;
the air passage is communicated with all the air holes; the air pipe joint is communicated with the air passage.
In some embodiments, a sealing rubber ring is arranged on the contact surface of the base and the lower mold core.
In some embodiments, the vertical movement assembly comprises: an anti-drop bolt and a lock nut; the anti-falling bolt penetrates through the upper die and the pressing plate; the lock nut is locked with the anti-falling bolt at the bottom of the pressing plate, so that the pressing plate can move relative to the upper die along the anti-falling bolt in the vertical direction.
In some embodiments, the vertical movement assembly further comprises: a pressure spring; the pressure spring is arranged on the anti-falling bolt, and is always in a compressed state.
In some embodiments, the through-connection is a guide post; the guide pillar is fixed at the top of the lower mold core and penetrates through the upper mold, so that the upper mold can move relatively with the lower mold core along the guide pillar.
In some embodiments, the resilient limiter comprises: a load spring and a spring guide post; the spring guide post penetrates through the lower die core from the bottom of the lower die core and extends to the top of the lower die core; the bearing spring is sleeved on the spring guide post.
In some embodiments, the inner surface shape of the die matches the outer surface shape of the punch.
According to a second aspect, based on the integrated die for punching and molding the graphite bipolar plate of the fuel cell, the application provides a punching and molding method for the graphite bipolar plate of the fuel cell, which comprises the following steps:
step S1: after the precast slab is placed, starting equipment, transmitting force to a pressure spring along with the stress of an upper die, wherein the pressure spring is stressed and compressed and acts on a material pressing plate, and the material pressing plate moves downwards to a precast slab pre-pressing position;
step S2: the pressing plate is kept motionless, the punch head continues to descend, and the graphite precast slab is punched;
step S3: after blanking is finished, vacuumizing the die, pressing the material pressing plate to a die forming position under pressure, and maintaining pressure by equipment to form the graphite bipolar plate;
step S4: after the forming is finished, the upper die and the pressing plate return, the base is ventilated, and the ejector pin ejects the waste.
In some embodiments, the "vacuuming the mold" in the step S3 includes: when the upper die descends to a preset vacuumizing starting position, starting a vacuum pump, and vacuumizing the die; detecting the internal vacuum degree of the die after the vacuumizing time reaches the preset vacuumizing time;
the "equipment pressure maintaining" in the step S3 includes: and detecting the compression molding pressure value, and maintaining the pressure of the equipment within the preset pressure maintaining time after the pressure value reaches the preset pressure.
The beneficial effects of the application are as follows:
according to the integrated punching and molding die for the graphite bipolar plate of the fuel cell, the punching head and the material pressing plate are combined, and the mode of pre-punching and post-forming is adopted, and meanwhile the flowability of the graphite prefabricated plate material is effectively utilized, so that burrs are prevented from being generated at the port or the air passage port of the graphite bipolar plate in the molding process.
Drawings
FIG. 1 is an exploded view of the structure of the device of the present application;
FIG. 2 is a schematic diagram of the structure of the present application;
FIG. 3 is a schematic diagram of the workflow of the present application.
Reference numerals illustrate:
an upper die-1; a punch head-2; a pressing plate-3; a lower mold core-4; a base-5; air holes-51; airway-52; an air tube connector-53; thimble-54; sealing rubber ring-55; anti-drop bolt-61; a lock nut-62; a pressure spring-63; guide post-7; a load spring-81; spring guide post-82.
Detailed Description
The principles and features of the present application are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the application and are not to be construed as limiting the scope of the application.
In order that the above-recited objects, features and advantages of the present application can be more clearly understood, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be understood that the depicted embodiments are some, but not all, embodiments of the present application. The specific embodiments described herein are to be considered in an illustrative rather than a restrictive sense. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the application, fall within the scope of protection of the application.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
Fig. 1 is an exploded view of the structure of the device of the present application, and fig. 2 is a schematic view of the structure of the present application.
Referring to fig. 1 and 2, a fuel cell graphite bipolar plate punch-press integrated die includes: the upper die 1, the punch 2, the pressing plate 3, the lower die core 4 and the base 5;
the punch 2 is fixed at the bottom of the upper die 1;
the pressing plate 3 is in vertical movement connection with the upper die 1 through a vertical movement assembly;
the upper die 1 and the lower die core 4 form vertical movable connection through a through connecting piece;
the lower die core 4 comprises a female die, and the female die corresponds to the punch 2 in position in the vertical direction;
the lower mold core 4 is detachably connected with the base 5;
the lower die core 4 further comprises an elastic limiting piece, and the elastic limiting piece can enable the material pressing plate 3 to keep a pre-pressing distance with the lower die core 4 all the time in the punching process.
Specifically, the scheme combines punching and die pressing processes of the graphite bipolar plate, and the flowability of graphite materials is utilized in a mode of punching and die pressing firstly, so that burrs cannot be generated at ports or air passage ports of the bipolar plate in the die pressing process. For punching operation, the upper die 1, the punch 2 and the lower die core 4 are matched, and the punch 2 is driven to move downwards to a female die of the lower die core 4 along a through connecting piece by the upper die 1, so that the punching operation is completed, wherein the female die corresponds to the punch 2 in position in the vertical direction, and the shape of the inner surface of the female die is matched with the shape of the outer surface of the punch 2; for the molding operation, after the punching operation is completed, the upper die 1 continues to descend, and the pressing plate 3 is pressed by the vertical moving assembly, thereby molding the prefabricated panel. The effect of elastic limiting piece is then guaranteeing that pressure plate 3 keeps working distance with lower mold core 4 under the pressureless action, before punching process begins, elastic limiting piece's top and pressure plate 3 do not contact, at the beginning of punching work, pressure plate 3 descends gradually, until pressure plate 3 contacts with elastic limiting piece's top, elastic limiting piece can hold pressure plate 3 this moment, make pressure plate 3 and lower mold core 4 keep the pre-compaction distance all the time, thereby guarantee the smooth completion of punching operation, after the completion of punching operation, go up mould 1 and continue to descend, after contacting pressure plate 3, continue to apply pressure for pressure plate 3, at this moment elastic limiting piece is compressed, make pressure plate 3 descend to the compression molding position, and cooperate lower mold core 4 to accomplish the compression molding operation.
In some embodiments, the base 5 comprises: ejector pin 54, air hole 51, air passage 52 and air pipe joint 53;
the ejector pin 54 is placed at the top of the air hole 51, and the top of the ejector pin 54 can extend into the female die;
the air passage 52 is communicated with all the air holes 51; the air pipe joint 53 is communicated with the air passage 52;
specifically, the air pipe connector 53 is communicated with the air passage 52, and the air passage 52 is communicated with all the air holes 51, so that the vacuumizing and the vacuum breaking in the molding process can be realized by pumping and inflating the air pipe connector 53; the ejector pins 54 function to eject the scrap from the lower core 4 after the molding operation is completed.
In some embodiments, a sealing rubber ring 55 is arranged on the contact surface of the base 5 and the lower mold core 4.
Specifically, the sealing rubber ring 55 is used to ensure the air tightness of the whole mold.
In some embodiments, in conjunction with fig. 1, the vertical movement assembly comprises: a drop-preventing bolt 61 and a lock nut 62; the anti-drop bolt 61 penetrates through the upper die 1 and the pressing plate 3; the lock nut 62 is locked with the anti-drop bolt 61 at the bottom of the pressing plate 3, so that the pressing plate 3 can move relative to the upper die 1 along the anti-drop bolt 61 in the vertical direction.
In some embodiments, the vertical movement assembly further comprises: a pressure spring 63; the pressure spring 63 is provided on the drop-preventing bolt 61, and the pressure spring 63 is always in a compressed state.
Specifically, the vertical moving assembly in this embodiment includes a drop-preventing bolt 61, a lock nut 62, and a pressure spring 63. The function of the anti-drop bolt 61 and the lock nut 62 is to ensure that the pressing plate 3 can move relative to the upper die 1 along the anti-drop bolt 61 in the vertical direction, and the pressure spring 63 ensures that the upper die 1 can apply pressure on the pressing plate 3, so that the pre-pressing and the pressing operation are completed.
In some embodiments, the through-connection is a guide post 7; the guide post 7 is fixed on the top of the lower mold core 4 and penetrates through the upper mold 1, so that the upper mold 1 can move relatively with the lower mold core 4 along the guide post 7.
Specifically, the through connecting piece in this scheme adopts the form of guide pillar 7, and the one end of guide pillar 7 is fixed the top of lower mold core 4, and the other end then link up last mould 1 for last mould 1 can take place relative movement along guide pillar 7 with lower mold core 4, thereby guaranteed punching a hole and the going on of mould pressing operation.
In some embodiments, the resilient limiter comprises: a load spring 81 and a spring guide post 82; the spring guide post 82 penetrates through the lower die core 4 from the bottom of the lower die core 4 and extends to the top of the lower die core 4; the bearing spring 81 is sleeved on the spring guide post 82.
Specifically, the elastic limiting piece of this scheme includes: load spring 81 and spring guide post 82. The bearing spring 81 is sleeved on the spring guide post 82 and is used for keeping the working distance between the material pressing plate and the lower die core 4 under the action of no pressure, so that the smooth completion of punching operation is ensured; the spring guide post 82 penetrates the lower die core 4 from the bottom of the lower die core 4 and extends to the top of the lower die core 4, and has the function of limiting the bearing spring 81 between the lower die core 4 and the pressing plate 3 to ensure that the bearing spring is in a controllable position.
In some embodiments, the present solution further includes: a pressure sensor, a negative pressure sensor and a control module; the pressure sensor is arranged on the material pressing plate 3 and is used for monitoring pressure and feeding the pressure back to the control module; the negative pressure sensor is arranged in the air passage 52 and is used for monitoring the negative pressure in the air passage 52 and feeding back the negative pressure value to the control module; the control module is used for controlling the stroke of the punch head and the inflation and deflation of the air passage.
Specifically, in order to facilitate pressure monitoring, the pressure sensor is arranged on the punch, and is used for monitoring the pressure value at the position of the material pressing plate 3 in the punching and die pressing process and feeding the pressure value back to the control module. The control module may control the stroke of the pressing plate 3 according to the pressure value, in this embodiment, the control module may be configured to determine, before the punching operation, whether the pressure value reaches a preset pre-pressing pressure according to the pressure value fed back by the pressure sensor, and if the pressure value does not reach the preset pre-pressing pressure, control the pressing plate 3 to continue to press downwards, and if the pressure value at the pressing plate 3 reaches the preset pre-pressing pressure, control the pressing plate 3 to stop downwards, and simultaneously control the punch 2 to complete the punching operation; in the mould pressing process, judging whether the negative pressure value reaches the preset pressure maintaining pressure according to the negative pressure value fed back by the negative pressure sensor, if not, continuing vacuumizing, and if so, controlling to stop vacuumizing and maintaining the pressure of the equipment within the preset pressure maintaining time.
With reference to fig. 3, which is a schematic diagram of the working flow of the present application, the basic flow of the integrated stamping and molding process for the graphite bipolar plate of the present application is as follows:
after the precast slab is placed, starting equipment; as the upper die 1 is stressed, the force is transmitted to the pressure spring 63, the pressure spring 63 is stressed and compressed, the acting force is on the pressing plate 3, and the pressing plate 3 moves downwards to a pre-pressing position of the precast slab; the pressing plate 3 is kept motionless, the punch head 2 continues to move downwards, and the graphite precast slab is punched; after blanking is finished, the punch 2 forms limit columns at the port and the air passage port immediately, the pressure plate 3 is pressurized and descends to a compression molding position along with the increase of the pressure value, when graphite material flows to the boundary of the punch 2, the graphite material is limited to flow, and is forced to be molded along with the pressure of the pressure plate 3 and the lower die core 4, so that burrs are not generated, and pressure maintaining molding is performed by equipment; after the forming is finished, the upper die 1 and the pressing plate 3 return; after the upper die 1 and the pressing plate 3 return to place, the base 5 is ventilated, and the ejector pins 54 eject the waste materials, so that the whole operation process is completed.
The application also provides a punching and molding method of the graphite bipolar plate of the fuel cell, which comprises the following steps:
step S1: after the precast slab is placed, starting equipment, transmitting force to a pressure spring 63 along with the stress of an upper die 1, wherein the pressure spring 63 is stressed and compressed and acts on a material pressing plate 3, and the material pressing plate 3 moves downwards to a precast slab pre-pressing position;
step S2: the pressing plate 3 is kept motionless, the punch head 2 continues to move downwards, and the graphite precast slab is punched;
step S3: after blanking is finished, vacuumizing the die, pressing the material plate 3 to a die-pressing forming position under pressure, and maintaining pressure by equipment to form the graphite bipolar plate;
step S4: after the forming is finished, the upper die 1 and the pressing plate 3 return, the base is ventilated, and the ejector pins 54 eject the waste.
In some embodiments, the "vacuuming the mold" in the step S3 includes: when the upper die 1 descends to a preset vacuumizing starting position, starting a vacuum pump, and vacuumizing the die; detecting the internal vacuum degree of the die after the vacuumizing time reaches the preset vacuumizing time;
the "equipment pressure maintaining" in the step S3 includes: and detecting the compression molding pressure value, and maintaining the pressure of the equipment within the preset pressure maintaining time after the pressure value reaches the preset pressure.
Specifically, since the flexible graphite precast slab adopts a scaly laminated structure, the compression molding is required to be performed in a vacuum environment, before the formal compression molding, the vacuum pumping operation is required to be performed preferentially, the vacuum pumping is performed within a preset vacuum pumping time, whether the vacuum degree reaches a preset standard is detected, and the upper die 1 can continue to press down after the vacuum degree reaches the preset standard. Meanwhile, when in punching operation, the flexible graphite precast slab is required to be pre-pressed to a certain amount by the punching die pressing plate, so that the reliability and the formability of punching of the flexible graphite precast slab can be ensured; therefore, the pre-pressing amount of the flexible graphite precast slab during punching is required to be strictly controlled within a standard range. In addition, the flexible graphite prefabricated plate must be subjected to pressure maintaining in the molding process to form the finished bipolar plate, so that a preset pressure is required to be set, and the pressure maintaining is performed on the equipment within a preset pressure maintaining time.
Those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments.
Those skilled in the art will appreciate that the descriptions of the various embodiments are each focused on, and that portions of one embodiment that are not described in detail may be referred to as related descriptions of other embodiments.
Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and alterations without departing from the spirit and scope of the present application, and such modifications and alterations fall within the scope of the appended claims, which are to be construed as merely illustrative of the present application, but the scope of the application is not limited thereto, and various equivalent modifications and substitutions will be readily apparent to those skilled in the art within the scope of the present application, and are intended to be included within the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
The present application is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present application, and these modifications and substitutions are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (8)
1. Fuel cell graphite bipolar plate punching die integrated die, its characterized in that includes: the device comprises an upper die, a punch, a pressing plate, a lower die core and a base;
the punch is fixed at the bottom of the upper die;
the pressing plate is in vertical movement connection with the upper die through a vertical movement assembly;
the upper die and the lower die core form vertical movable connection through a through connecting piece;
the lower die core comprises a female die, and the female die corresponds to the punch in position in the vertical direction;
the lower mold core is detachably connected with the base;
the lower die core further comprises an elastic limiting piece, and the elastic limiting piece can enable the pre-pressing distance between the material pressing plate and the lower die core to be kept all the time in the punching process;
the base includes: the ejector pin, the air hole, the air passage and the air pipe joint;
the ejector pin is arranged at the top of the air hole, and the top of the ejector pin can extend into the female die;
the air passage is communicated with all the air holes; the air pipe joint is communicated with the air passage;
further comprises: a pressure sensor, a negative pressure sensor and a control module;
the control module is used for controlling the stroke of the punch head and the inflation and deflation of the air passage; the control module is arranged to judge whether the pressure value reaches a preset pre-pressing pressure according to the pressure value fed back by the pressure sensor before punching operation, if not, the control module controls the material pressing plate to continuously press downwards, and if the pressure value at the material pressing plate reaches the preset pre-pressing pressure, the control module controls the material pressing plate to stop downwards and simultaneously controls the punch to finish punching operation;
the projection of the pressing plate in the vertical direction can completely cover the precast slab.
2. The integrated die for punching and molding the graphite bipolar plate of the fuel cell according to claim 1, wherein a sealing rubber ring is arranged on the contact surface of the base and the lower die core.
3. The fuel cell graphite bipolar plate punch-die integrated mold of claim 2, wherein said vertical movement assembly comprises: an anti-drop bolt and a lock nut; the anti-falling bolt penetrates through the upper die and the pressing plate; the lock nut is locked with the anti-falling bolt at the bottom of the pressing plate, so that the pressing plate can move relative to the upper die along the anti-falling bolt in the vertical direction.
4. The fuel cell graphite bipolar plate punch-press integral die of claim 3, wherein said vertical movement assembly further comprises: a pressure spring; the pressure spring is arranged on the anti-falling bolt, and is always in a compressed state.
5. The fuel cell graphite bipolar plate punch-die integrated die of claim 2, wherein the through-connection member is a guide post; the guide pillar is fixed at the top of the lower mold core and penetrates through the upper mold, so that the upper mold can move relatively with the lower mold core along the guide pillar.
6. The fuel cell graphite bipolar plate punch-die integrated mold of claim 2, wherein the elastic limiting member comprises: a load spring and a spring guide post; the spring guide post penetrates through the lower die core from the bottom of the lower die core and extends to the top of the lower die core; the bearing spring is sleeved on the spring guide post.
7. The fuel cell graphite bipolar plate punch-press integrated mold of any one of claims 1-6, further comprising: a pressure sensor, a negative pressure sensor and a control module; the pressure sensor is arranged on the material pressing plate and used for monitoring pressure and feeding back the pressure to the control module; the negative pressure sensor is arranged in the air passage and is used for monitoring the negative pressure in the air passage and feeding back a negative pressure value to the control module; the control module is used for controlling the stroke of the punch head and the inflation and deflation of the air passage.
8. A fuel cell graphite bipolar plate punch press molding method for a fuel cell graphite bipolar plate punch press molding integrated mold according to claim 1, comprising the steps of:
step S1: after the precast slab is placed, starting equipment, transmitting force to a pressure spring along with the stress of an upper die, wherein the pressure spring is stressed and compressed and acts on a material pressing plate, and the material pressing plate moves downwards to a precast slab pre-pressing position;
step S2: the pressing plate is kept motionless, the punch head continues to descend, and the graphite precast slab is punched;
step S3: after blanking is finished, vacuumizing the die, pressing the material pressing plate to a die forming position under pressure, and maintaining pressure by equipment to form the graphite bipolar plate;
step S4: after the forming is finished, the upper die and the pressing plate return, the base is ventilated, and the ejector pin ejects the waste;
the "vacuuming the mold" in step S3 includes: when the upper die descends to a preset vacuumizing starting position, starting a vacuum pump, and vacuumizing the die; detecting the internal vacuum degree of the die after the vacuumizing time reaches the preset vacuumizing time;
the "equipment pressure maintaining" in the step S3 includes: and detecting the compression molding pressure value, and maintaining the pressure of the equipment within the preset pressure maintaining time after the pressure value reaches the preset pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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|---|---|
| CN116278144A (en) | 2023-06-23 |
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