CN215879421U - Intelligent manufacturing production line for metal polar plate of hydrogen fuel cell - Google Patents
Intelligent manufacturing production line for metal polar plate of hydrogen fuel cell Download PDFInfo
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- CN215879421U CN215879421U CN202121848745.5U CN202121848745U CN215879421U CN 215879421 U CN215879421 U CN 215879421U CN 202121848745 U CN202121848745 U CN 202121848745U CN 215879421 U CN215879421 U CN 215879421U
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Abstract
The utility model discloses an intelligent manufacturing production line for a metal polar plate of a hydrogen fuel cell, which comprises a lower end surface of a male die, a lower convex cambered surface A and horizontal parts A at two ends of the cambered surface A in the arc length direction; the upper end surface of the female die comprises an upward cambered surface B and horizontal parts B at two ends of the cambered surface B in the arc length direction; during mold closing, under the action of mold closing driving force, the arc surface A and the arc surface B gradually generate interaction force from the center to two sides, and form a relative plane matched with the surface of a formed plate in a final mold closing state. The cambered surface A and the cambered surface B are designed into a profile with a convex center, so that gradual loading and stamping forming can be realized, the force loss during plane contact is reduced, the utilization rate of a forming load is higher, and the consistency of a large-area metal pole plate microstructure is better.
Description
Technical Field
The utility model relates to the technical field of stamping and forming of metal polar plates of hydrogen fuel cells, in particular to an intelligent manufacturing production line of the metal polar plates of the hydrogen fuel cells.
Background
The hydrogen energy has the outstanding advantages of cleanness, zero emission, renewability and the like, and is listed as an energy strategy in China. The metal pole plate is a framework and a blood vessel of the hydrogen fuel cell, plays a plurality of roles of distributing fuel gas, collecting current, draining water, dissipating heat, mechanically supporting and the like, and accounts for 24% of the cost, 60% of the volume and 60-80% of the weight. In order to reduce the volume and the weight of the hydrogen fuel cell and improve the volume/mass power density, a metal sheet is adopted for stamping and forming, and the wall thickness is reduced from 100 mu m to 75 mu m or even thinner; the characteristic size of the micro-channel is less than 1.0mm, and the precision is 3-5 mu m; the metal polar plate area is big, and the outer contour dimension is more than 500mm 220 mm.
The structural characteristics of the metal polar plate bring great difficulty to the stamping and forming manufacture of the metal polar plate, the forming quality is not high, and the performance of the hydrogen fuel cell is obviously influenced.
1) The micro-flow channel is extremely uneven in size, low in the middle and high on two sides due to the influences of bending deformation, friction, edge pressing constraint and the like of molded surfaces of a male die and a female die of a stamping die, and in order to ensure reliable contact of the uneven micro-flow channel and a proton exchange membrane group, additional pretightening force needs to be added during assembly of a fuel cell stack, but the diffusion speed of fuel gas in the proton exchange membrane group can be influenced, so that the performance of the fuel cell is reduced.
2) The micro-channel has poor dimensional accuracy, such as low ridge top flatness and large width error, increases the contact resistance between the polar plate and the proton exchange membrane group, and also obviously reduces the performance of the fuel cell. Therefore, it is difficult to solve the above-mentioned bottleneck problem only by the conventional methods such as increasing the press forming force.
Therefore, the utility model provides an intelligent production line for a metal polar plate of a hydrogen fuel cell.
Disclosure of Invention
According to the characteristic of bending deformation of the profile of a sheet stamping forming die, the design of a generally adopted plane profile is changed into the design of a bent profile, the contact between the bent and high-center die profile and the sheet is gradually established, and the local loading force in a central area can ensure that a micro-channel at the central position of the polar plate is firstly formed, so that the width size precision and the size consistency of the ridge of the micro-channel of the polar plate are improved. The influence of the bending deformation of the mold surface on the forming precision of the metal polar plate is compensated, and the formed micro-channel has higher precision and better size consistency by utilizing the local and gradual loading formed by the non-planar surface.
The technical scheme disclosed by the utility model is as follows: hydrogen fuel cell metal polar plate intelligence is made and is produced line includes:
the lower end surface of the male die comprises a downward convex cambered surface A and horizontal parts A at two ends of the cambered surface A in the arc length direction;
the upper end surface of the female die comprises an upwards-convex cambered surface B and horizontal parts B at two ends of the cambered surface B in the arc length direction;
when the die is closed, under the action of a die closing driving force, the cambered surfaces A and B are gradually mutually pressed from the center to two sides, and a relative plane matched with the surface of the formed plate is formed in the final die closing state.
On the basis of the scheme, preferably, the upper end face of the male die is fixedly connected with an upper die base through a male die support, the upper die base is fixedly connected with a driving unit, and the driving unit is a common hydraulic machine, a mechanical press or a servo press.
In addition to the above, it is preferable that a fixing means for fixing the plate material to the horizontal portion B by strong restraint is further included around the male die.
On the basis of the scheme, preferably, the fixing device comprises a guide hole, a guide part, a blank holder and an elastic part, wherein the guide hole, the guide part, the blank holder and the elastic part are arranged on the upper die base, one end of the guide part is fixed on the blank holder surrounding the male die, the other end of the guide part extends into the guide hole, the blank holder is in clearance fit with the male die, each guide part corresponds to one elastic part, one end of the elastic part is fixedly connected with the male die, and the other end of the elastic part is fixedly connected with the upper die base.
On the basis of the above scheme, preferably, the guide member is a guide bolt, the elastic member is a spring, and the spring is sleeved on the guide bolt.
On the basis of the scheme, preferably, the lower end face of the female die is fixedly connected with the lower die holder through the groove support, and the lower die holder is fixedly connected with the working table.
On the basis of the scheme, preferably, the female die support and the lower die holder are fixedly connected through a fixing bolt.
On the basis of the scheme, preferably, the lower end face of the upper die base is fixedly provided with a guide pillar, the lower die base is provided with a guide hole A, and the guide pillar is inserted into the guide hole A.
On the basis of the above scheme, preferably, the arc surface a is provided with a plurality of upper convex portions and an upper concave portion located between two adjacent upper convex portions, the arc surface B is provided with a plurality of lower convex portions and a lower concave portion located between two adjacent lower convex portions, the upper convex portions are matched with the lower concave portions, and the lower convex portions are matched with the upper concave portions.
Compared with the prior art, the utility model has the following beneficial effects:
1. the lower surface of the male die and the upper surface of the female die are designed into convex structures, and the convex structures can compensate metal pole plate stamping forming errors caused by elastic deformation of molded surfaces of the male die and the female die;
2. the cambered surface A and the cambered surface B are designed into the profile with the center raised, so that gradual loading and stamping forming can be realized, the force loss during plane contact is reduced, the utilization rate of a forming load is higher, the consistency of a large-area metal pole plate microstructure is better, specifically, the forming starts from the center, a local load is formed, the forming precision of an ultrathin plate microstructure is improved, then, gradual loading forming is performed from the center under the action of elastic deformation, the force loss during plane contact is reduced by the microstructure, and the consistency of the geometric dimension of the metal pole plate microstructure can be better ensured.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a state diagram after the mold clamping of the present invention;
FIG. 3 is a view showing a state where a male mold and a female mold are in contact with each other;
fig. 4 is a state diagram after the male and female molds are closed.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the utility model, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
As shown in fig. 1-4, the intelligent manufacturing line for the hydrogen fuel cell metal plate comprises a male die 1, wherein the lower end surface of the male die comprises a downward convex cambered surface a2 and horizontal parts A3 at two ends of the cambered surface a in the arc length direction; the upper end surface of the female die comprises an upwards-convex cambered surface B5 and horizontal parts B6 at two ends of the cambered surface B in the arc length direction; when the die is closed, under the action of a die closing driving force, the cambered surfaces A and B are gradually mutually pressed from the center to two sides, and a relative plane matched with the surface of the formed plate is formed in the final die closing state.
The upper end face of the male die is fixedly connected with an upper die base 8 through a male die support 7, the upper die base is fixedly connected with a driving unit, and the driving unit is a common hydraulic press, a mechanical press or a servo press.
And the fixing device surrounds the male die and is used for fixing the plate on the horizontal part B in a strong restraining manner. The fixing device comprises a guide hole 9, a guide part 10, a blank holder 11 and an elastic part 12, wherein the guide hole is formed in the upper die base, one end of the guide part is fixed on the blank holder surrounding the male die, the other end of the guide part extends into the guide hole, the blank holder is in clearance fit with the male die, each guide part corresponds to one elastic part, one end of each elastic part is fixedly connected with the male die, and the other end of each elastic part is fixedly connected with the upper die base.
The guide piece is a guide bolt, the elastic piece is a spring, and the spring is sleeved on the guide bolt.
The lower end surface of the female die is fixedly connected with a lower die holder 14 through a groove support 13, and the lower die holder is fixedly connected with a working table.
The female die support and the lower die holder are fixedly connected through a fixing bolt 15.
The lower end face of the upper die base is fixedly provided with a guide post 16, the lower die base is provided with a guide hole A17, and the guide post is inserted into the guide hole A.
The cambered surface A is provided with a plurality of upper convex parts and an upper concave part positioned between two adjacent upper convex parts, the cambered surface B is provided with a plurality of lower convex parts and a lower concave part positioned between two adjacent lower convex parts, the upper convex parts are matched with the lower concave parts, and the lower convex parts are matched with the upper concave parts.
More specifically, the intelligent manufacturing production line for the hydrogen fuel cell metal polar plate mainly comprises an upper die holder, a male die support, a blank holder, a spring, a guide bolt, a guide pillar, a female die support, a lower die holder, a fixing bolt and the like.
The lower surface of the male die is distributed with microstructures 18, and the upper surface of the female die is also provided with microstructures which are matched with the microstructures on the lower surface of the male die so as to stamp and form the metal pole plate.
The upper surface of the male die is fixed with the upper die base through a male die support, and the upper surface of the male die and the upper die base together form an upper half die which is usually fixed on a moving slide block of equipment. The lower surface of the female die is fixed with the lower die holder through a female die support and a fixing bolt to form a lower half die which is usually fixed on a working table surface of equipment.
The blank holder is arranged on the periphery of the male die, blank holding force is provided by a spring, the spring can be replaced by other elastic elements, the blank holder is connected with the upper die base through a guide bolt, the blank holder can be guaranteed to move up and down within a certain displacement range, and guide is provided by the guide bolt. And the ultrathin plates of stainless steel, titanium and the like are placed between the female die and the male die and between the female die and the blank holder. The blank holder provides pressing force to strongly restrict the movement of the blank holder so that the ultrathin plate is fixed on the female die; and under the action of the microstructure on the lower surface of the male die and the microstructure on the upper surface of the female die, the ultrathin plate is subjected to plastic deformation, and a metal polar plate with the shape consistent with the shape of the microstructure is formed by punching.
The guide post is arranged on the upper die base close to the edge and matched with the guide sleeve arranged on the lower die base to provide guidance for the up-and-down movement of the upper half die so as to ensure the accurate matching of the male die microstructure and the female die microstructure.
In order to improve the stamping forming quality of the metal polar plate microstructure, the lower surface of a male die is designed into a convex shape, and the upper surface of a female die is designed into a convex shape. And (3) with the downward movement of the upper half die, the microstructure at the center of the male die is firstly contacted with the microstructure at the center of the female die, and then the ultrathin plate microstructure is gradually formed by stamping. When the upper half mold continues to move downwards, under the action of external force, the male mold and the female mold elastically deform and are contacted with each other through the micro-structure at the center, and gradually, the whole surface of the micro-structure is completely contacted, and finally, the whole metal pole plate with the micro-structure is formed.
The working process is as follows:
the gradual loading and stamping forming of the bending compensation molded surface of the metal polar plate of the hydrogen fuel cell can be carried out on equipment such as a common hydraulic press, a mechanical press, a servo press and the like. In order to ensure the forming quality of the metal polar plate, a servo press machine which is independently developed is implemented and selected, the tonnage is 15t, and high-precision displacement control of 3-5 mu m can be provided. Placing the forming device on the working table of a servo press, and fixing the forming device through bolts, pressing blocks and the like; and controlling the servo press slide block to move downwards, fixing the upper die base and the press slide block by using a bolt, a pressing block and the like when the servo press slide block is close to contact with the upper surface of the upper die base of the forming device, and driving the upper half die to move up and down by the press slide block through the upper die base.
When the metal polar plate is punched and formed, the upper half die is lifted by 10-50mm through a press slide block, and then a flat and clean 304 or 316 or titanium ultrathin plate with the thickness of 0.05-0.1mm is placed on the upper surface of the concave die. The press is then actuated and the ram is moved downwardly. The blank holder is firstly contacted with the upper surface of the ultrathin plate, continues to move downwards along with the sliding block, and presses the ultrathin plate under the action of the spring to provide strong restraint; the slide block continues to move downwards, and the microstructures at the central parts of the male die and the female die are respectively contacted with the upper surface and the lower surface of the ultrathin plate and then stamped to form the microstructures; and (3) the slide block continues to move downwards, the male die and the female die are elastically deformed, the deformation is gradually increased, the contact area is gradually increased in the process, the gradual loading punching forming is formed, and finally the lower surface of the male die is in close contact with the upper surface of the female die to finish the punching forming. And then, the slide block of the servo press moves upwards, and the upper half die is lifted, so that the metal pole plate formed by stamping can be taken out from the die device. And ending the stamping forming process of the metal polar plate of the hydrogen fuel cell.
Because the lower surface of the male die and the upper surface of the female die are convex and not plane, the influence of elastic deformation of the male die and the female die can be compensated; meanwhile, the microstructure is formed by center contact and then is continuously expanded, and the forming is gradually expanded until the forming is finished. The protruding height of the lower surface of the male die or the upper surface of the female die is determined according to the size of the pole plate, for example, when the length of the pole plate is 300-500mm and the width is 100-250mm, the protruding height is 0.1-0.5mm, and the accurate value can be obtained by analyzing and calculating according to the specific die material and the forming force.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. Hydrogen fuel cell metal polar plate intelligence manufacturing line, its characterized in that includes:
the lower end surface of the male die comprises a downward convex cambered surface A and horizontal parts A at two ends of the cambered surface A in the arc length direction;
the upper end surface of the female die comprises an upwards-convex cambered surface B and horizontal parts B at two ends of the cambered surface B in the arc length direction;
when the die is closed, under the action of a die closing driving force, the cambered surfaces A and B are gradually mutually pressed from the center to two sides, and a relative plane matched with the surface of the formed plate is formed in the final die closing state.
2. The intelligent manufacturing line for metal plates of hydrogen fuel cells according to claim 1, wherein the upper end face of the male die is fixedly connected with the upper die base through the male die support, the upper die base is fixedly connected with the driving unit, and the driving unit is a common hydraulic press, a mechanical press or a servo press.
3. The intelligent manufacturing line for metal plates of hydrogen fuel cells according to claim 2, further comprising fixing means surrounding the male mold for fixing the plate on the horizontal portion B with strong constraint.
4. The intelligent manufacturing line for metal plates of hydrogen fuel cells as claimed in claim 3, wherein the fixing device comprises a guide hole, a guide member, a blank holder, and an elastic member, the guide member is disposed on the upper die base, one end of the guide member is fixed on the blank holder surrounding the male die, the other end of the guide member extends into the guide hole, the blank holder is in clearance fit with the male die, each guide member corresponds to one elastic member, one end of each elastic member is fixedly connected with the male die, and the other end of each elastic member is fixedly connected with the upper die base.
5. The intelligent manufacturing line for metal plates of hydrogen fuel cells as claimed in claim 4, wherein the guiding member is a guiding bolt, the elastic member is a spring, and the spring is sleeved on the guiding bolt.
6. The intelligent manufacturing line for metal plates of hydrogen fuel cells as claimed in claim 2, wherein the lower end face of the female die is fixedly connected with the lower die holder through the groove support, and the lower die holder is fixedly connected with the working table.
7. The intelligent manufacturing line for metal plates of hydrogen fuel cells as claimed in claim 6, wherein the female die support and the lower die holder are fixedly connected by a fixing bolt.
8. The intelligent manufacturing line for metal plates of hydrogen fuel cells as claimed in claim 6, wherein the lower end face of the upper die base is fixedly provided with a guide post, the lower die base is provided with a guide hole A, and the guide post is inserted into the guide hole A.
9. The intelligent manufacturing line for metal plates of hydrogen fuel cells according to any one of claims 1 to 8, wherein the arc surface A has a plurality of upper convex portions and upper concave portions between two adjacent upper convex portions, the arc surface B has a plurality of lower convex portions and lower concave portions between two adjacent lower convex portions, the upper convex portions are engaged with the lower concave portions, and the lower convex portions are engaged with the upper concave portions.
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| CN202121848745.5U CN215879421U (en) | 2021-08-09 | 2021-08-09 | Intelligent manufacturing production line for metal polar plate of hydrogen fuel cell |
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| CN202121848745.5U CN215879421U (en) | 2021-08-09 | 2021-08-09 | Intelligent manufacturing production line for metal polar plate of hydrogen fuel cell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116984467A (en) * | 2023-09-26 | 2023-11-03 | 合肥工业大学 | Ultrasonic-assisted precise forming method for ultrathin metal polar plate |
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2021
- 2021-08-09 CN CN202121848745.5U patent/CN215879421U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116984467A (en) * | 2023-09-26 | 2023-11-03 | 合肥工业大学 | Ultrasonic-assisted precise forming method for ultrathin metal polar plate |
| CN116984467B (en) * | 2023-09-26 | 2023-12-15 | 合肥工业大学 | Ultrasonic-assisted precise forming method for ultrathin metal polar plate |
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Effective date of registration: 20230109 Address after: Room 406, Building 12, Xinxin Garden, Suzhou Industrial Park, Jiangsu Province, 215522 Patentee after: Wang Chunju Address before: 181 Chongyuan Road, Zhouzhuang Town, Kunshan City, Suzhou City, Jiangsu Province Patentee before: Kunshan jiehydrogen New Energy Technology Co.,Ltd. |