A thin metal bipolar plate blanking die

Abstract

The utility model discloses a kind of thin metal bipolar plate blanking die, including punch, die and blanking table;The punch bottom side is equipped with the blade and punching punch knife that protrude outward, the shape of the blade is adapted to the outer contour of thin metal bipolar plate, the punching punch knife is in the blade and corresponds with the bipolar position of thin metal bipolar plate;The die is equipped below the punch, recess is opened in the die top side, the groove bottom around of recess is equipped with the falling blade groove adapted to the blade;The sidewall of the die is equipped with the feed channel being communicated with the sidewall of recess, blanking hole and blanking groove are equipped in the recess, the position of blanking hole corresponds with the punching punch knife, blanking groove is equipped in the side opposite to the feed channel;The blanking table is equipped below the die, blanking table is opened with blanking passage, blanking passage upper end is communicated with blanking hole and blanking groove, lower end is communicated to blanking table outside.

Description

Technical Field

[0001] This utility model relates to the field of proton exchange membrane fuel cell technology, and in particular to a thin metal bipolar plate punching die. Background Technology

[0002] Proton exchange membrane fuel cells (PEMFCs), as highly efficient and environmentally friendly energy conversion devices, are widely used in portable power supplies, transportation, and other fields. Bipolar plates are one of the core components, accounting for 60-80% of the total weight of the fuel cell stack and 20-40% of its total cost. Metal bipolar plates have become the mainstream choice due to their excellent electrical and thermal conductivity and ease of mass production. However, channelless thin metal bipolar plates have even greater application potential due to their simple structure, light weight, and low material usage.

[0003] Existing processing methods for channelless thin metal bipolar plates mainly rely on laser cutting or machining, which have the following problems: unevenness, deformation, twisting and flash are prone to occur after processing, resulting in substandard geometric dimensions and accuracy, and a high defect rate; low production efficiency and low material utilization rate, which cannot meet the needs of large-scale production.

[0004] To address the aforementioned issues, this invention proposes a thin metal bipolar plate punching die. Through optimized structural design, it achieves efficient, precise, and low-deformation processing, meeting the needs of large-scale production. Utility Model Content

[0005] The purpose of this utility model is to provide a thin metal bipolar plate punching die to solve the problems mentioned in the background art. To achieve the above objective, this utility model provides the following technical solution:

[0006] A thin metal bipolar plate stamping die, comprising:

[0007] The punch has an outwardly protruding blade and a punching tool on its bottom side. The blade is designed to be annular and adapted to the outer contour of the thin metal bipolar plate. The punching tool is located in the blade and corresponds to the bipolar position of the thin metal bipolar plate.

[0008] A die cavity is located below the punch. A groove is formed on the top side of the die cavity, and a cutting groove, adapted to the cutting edge, is formed around the bottom of the groove. A feeding channel, communicating with the side wall of the groove, is formed on the side wall of the die cavity. A blanking hole and a blanking groove are provided in the groove. The blanking hole is positioned corresponding to the punch, and the blanking groove is located on the side opposite to the feeding channel.

[0009] A blanking platform is located below the die cavity. The blanking platform has a blanking channel. The upper end of the blanking channel is connected to the blanking hole and the blanking groove, and the lower end is connected to the outside of the blanking platform.

[0010] Furthermore, the cutting edge and the punch protrude to the bottom side of the punch at the same height.

[0011] Furthermore, the bottom side of the punch is provided with a boss that matches the shape of the groove, and the cutting edge and the punching tool are provided outwardly on the bottom side of the boss, and the cutting edge is arranged around the boss.

[0012] Furthermore, the punch has an internal threaded hole, the upper end of the punching tool has an external thread, the upper end of the punching tool is threadedly connected to the internal threaded hole, and the lower end protrudes to the bottom side of the punch.

[0013] Furthermore, the bottom of the groove is provided with a material discharge hole.

[0014] Furthermore, the sidewall of the feed channel is connected to the sidewalls at both ends of the groove to form a single unit.

[0015] Furthermore, the height of the feed channel is greater than the thickness of the thin metal bipolar plate.

[0016] Furthermore, the die cavity is provided with multiple grooves, which are arranged side by side along the feeding direction of the feeding channel, and the adjacent sidewalls of two adjacent grooves are connected; the bottom side of the punch is provided with multiple sets of cutting edges and punches, which are the same number as the grooves.

[0017] The beneficial effects of this utility model are as follows: Through optimized structural design, the thin metal bipolar plate punching die of this utility model can complete the punching of the entire bipolar plate and through holes in one go, without secondary processing, which greatly improves production efficiency and shortens the processing cycle; the material discharge channel of the blanking table realizes automatic discharge of waste, avoids the accumulation of waste and affects the continuity of production, and further improves production efficiency; and the overall structure is simple, the manufacturing cost is low, it is easy to mass-produce, and can meet the needs of large-scale production. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the punching die of this utility model.

[0020] Figure 2 This is an exploded structural diagram of the blanking die of this utility model.

[0021] Figure 3This is a cross-sectional view of one side of the punching die of this utility model.

[0022] Figure 4 This is a cross-sectional view of the other side of the punching die of this utility model.

[0023] Figure 5 This is a schematic diagram of the structure of the punch of this utility model.

[0024] Figure 6 This is an exploded structural diagram of the punch of this utility model.

[0025] Figure 7 This is a schematic diagram of the punching tool of this utility model.

[0026] Figure 8 This is a schematic diagram of the structure of the concave mold of this utility model.

[0027] Figure 9 This is a schematic diagram of the bottom structure of the concave mold of this utility model.

[0028] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0031] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0032] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0033] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0034] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0035] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0036] A thin metal bipolar plate blanking die mainly includes three core components: a punch 1, a die 2, and a blanking table 3. Figures 1 to 4 As shown, the specific structure of each component and their interconnections are as follows:

[0037] The punch 1 is fixed to the press head of the press through the mounting hole and can move up and down with the press head. The bottom side of the punch 1 is provided with an outwardly protruding blade 11 and a punching cutter 12. The blade 11 is designed to be annular and adapted to the outer contour of the thin metal bipolar plate 4. The punching cutter 12 is located in the annular area enclosed by the blade 11 and its position corresponds to the bipolar position of the thin metal bipolar plate 4.

[0038] The die 2 is located below the punch 1, with the two corresponding vertically. A groove 21 is formed on the top side of the die 2 for positioning the metal bipolar plate. Around the bottom of the groove 21, there are drop grooves 22 that match the cutting edge 11. The bottom of the drop grooves 22 is deeper than the bottom of the groove 21, allowing the cutting edge 11 to embed during punching. A feeding channel 23, connected to the side wall of the groove 21, is formed on the side wall of the die 2 for feeding the metal substrate. The groove 21 has a blanking hole 24 and a blanking groove 25, both penetrating the die 2. The blanking hole 24 corresponds to the punching cutter 12, and the blanking groove 25 is located on the side opposite to the feeding channel 23.

[0039] The blanking table 3 is located below the die 2. The die 2 is fixedly connected to the blanking table 3, which is fixedly installed on the press operating table. The blanking table 3 has a blanking channel 31. The upper end of the blanking channel 31 is connected to the blanking hole 24 and the blanking groove 25, and the lower end is connected to the outside of the blanking table 3 for discharging waste material.

[0040] The working principle of the thin metal bipolar plate punching die in this embodiment is as follows: During processing, the metal plate substrate is fed into the groove 21 through the feeding channel 23 of the die 2. The groove 21 and the feeding channel 23 cooperate to achieve precise positioning of the substrate. Then, the press is started, and the punch 1 moves downward with the press head. The blade 11 and the punching punch 12 on the bottom side of the punch 1 pre-press the substrate downward. After the blade 11 punches out the overall outer contour of the thin metal bipolar plate 4, it falls into the drop groove 22 of the die 2. At the same time, the punching punch 12 punches out the through hole of the bipolar plate through the drop hole 24 of the die 2. The waste generated by punching (outer contour waste and through hole waste) enters the drop channel 31 of the drop table 3 through the drop groove 25 and the drop hole 24, and is finally discharged to the outside of the die. After the punching is completed, the punch 1 moves upward to reset. The finished product remains in the groove 21 of the die 2 or is taken out through the subsequent unloading structure. After taking it out, the above steps are repeated to achieve continuous production.

[0041] The thin metal bipolar plate punching die of this embodiment achieves one-time simultaneous punching of the entire bipolar plate and through holes through optimized die structure design, eliminating the need for secondary processing, significantly improving production efficiency and shortening the processing cycle; the feeding channel 23 and the groove 21 cooperate to achieve precise positioning of the metal plate, reducing displacement during processing and effectively solving the problems of unevenness, deformation, and inaccurate dimensions of products in the prior art; the discharge channel 31 of the discharge table 3 enables automatic discharge of waste, avoiding waste accumulation that affects production continuity and further improving production efficiency; the overall structure is simple, the manufacturing cost is low, it is easy to mass-produce, and it can meet the needs of large-scale production.

[0042] In some implementation schemes, see Figures 3 to 5The cutting edge 11 and the punching cutter 12 protrude to the bottom side of the punch 1 at the same height, meaning that the lower end faces of the cutting edge 11 and the punching cutter 12 are on the same horizontal plane. Because the cutting edge 11 and the punching cutter 12 protrude at the same height, when the punch 1 descends, both can simultaneously contact the metal sheet substrate and complete the punching action. The cutting edge 11 simultaneously cuts off the outer contour, and the punching cutter 12 simultaneously punches out the through hole, achieving "one-time punching, full-size forming." This avoids "step-by-step punching" caused by the different heights of the cutting edge 11 and the punching cutter 12, reducing the stress deformation of the metal sheet during the punching process (such as local stress concentration that may result from step-by-step punching). It ensures the relative positional accuracy of the outer contour and the through hole, avoids dimensional deviations caused by secondary processing, and improves the product qualification rate. Furthermore, it shortens the single punching time and improves production efficiency.

[0043] In some implementation schemes, see Figures 3 to 5 The bottom side of the punch 1 is provided with a boss 13 that matches the shape of the groove 21, that is, the shape of the boss 13 matches the inner cavity of the groove 21; the cutting edge 11 and the punching tool 12 are provided on the bottom side of the boss 13, with the cutting edge 11 arranged around the perimeter of the boss 13, and the punching tool 12 distributed on the bottom side of the boss 13 at positions corresponding to the bipolar parts of the thin metal bipolar plate 4. During operation, after the metal plate substrate is fed into the groove 21 of the die 2, when the punch 1 moves downward, the boss 13 enters the groove 21 and fits against the inner wall of the groove 21, realizing the pre-positioning of the cutting edge 11 and the cutting groove 22; subsequently, the cutting edge 11 and the punching tool 12 on the bottom side of the boss 13 complete the punching under pressure. The boss 13 structure enhances the overall rigidity of the punch 1. The cooperation between the boss 13 and the groove 21 enhances the guiding accuracy of the mold, realizes the precise alignment of the punch 1 and the die 2, avoids damage to the cutting edge 11 or the die 2 due to alignment deviation, and extends the service life of the mold. In the punching process, it can also limit the warping or deformation of the metal plate, further ensuring the flatness and dimensional accuracy of the product.

[0044] In some implementation schemes, see Figure 6 and Figure 7 The punch 1 has an internal threaded hole 14, and the upper end of the punching cutter 12 has an external thread. The upper end of the punching cutter 12 is threadedly connected to the internal threaded hole 14, and the lower end protrudes to the bottom side of the punch 1. The threaded connection structure is simple, and assembly and disassembly are convenient, which facilitates the replacement and maintenance of the punching cutter 12 and reduces the maintenance cost of the mold. During assembly, the punching cutter 12 is screwed into the internal threaded hole 14 of the punch 1 to the preset position and fixed. When the punching cutter 12 needs to be replaced, the old punch can be unscrewed and the new punch can be screwed in directly without disassembling the entire punch 1.

[0045] In some implementation schemes, see Figure 8 and Figure 9The bottom of the groove 21 is also provided with a material ejection hole 26, which penetrates the die 2 (connecting the top and bottom). After the blanking is completed, if the finished product is stuck in the groove 21 of the die 2 due to adhesion or jamming, external force can be applied through the material ejection hole 26 (such as pushing from the bottom of the die 2 upward with a push rod) to push the finished product out of the groove 21, realizing convenient material removal, solving the problem of finished product stuck in the groove 21 after blanking, avoiding scratches or deformation during manual material removal, ensuring product quality, and improving production continuity and efficiency.

[0046] In some implementation schemes, see Figure 4 The sidewalls of the feeding channel 23 and the sidewalls at both ends of the groove 21 are connected as a single unit, meaning the feeding channel 23 and the groove 21 are integrally formed without any seams, creating a continuous guide surface. This enhances the guiding and positioning accuracy of the metal sheet and prevents problems such as incomplete finished products and inaccurate dimensions caused by feeding deviation. When the metal sheet substrate is fed into the feeding channel 23, its edges always fit against the continuous sidewalls, avoiding "jamming" or "deviation" caused by seams. This ensures that the metal sheet accurately enters the preset processing position of the groove 21, facilitating rapid feeding and improving production efficiency.

[0047] In some implementation schemes, see Figure 1 and Figure 4 The height of the feeding channel 23 is slightly higher than the thickness of the thin metal bipolar plate 4. This ensures that the metal plate substrate can pass smoothly through the channel, facilitating the rapid feeding of the metal plate, reducing jamming during the feeding process, and improving feeding efficiency. At the same time, the channel sidewall restricts the vertical warping of the metal plate, ensuring that it enters the groove 21 in a flat state for processing, laying the foundation for subsequent precise punching.

[0048] In some implementation schemes, see Figure 2 , Figure 5 and Figure 8The die 2 has multiple grooves 21 arranged side-by-side along the feeding direction of the feed channel 23, with adjacent sidewalls of two adjacent grooves 21 connected. The bottom side of the punch 1 is provided with multiple sets of cutting edges 11 and punching cutters 12, the same number as the grooves 21. Each set of cutting edges 11 and punching cutters 12 is adapted to the processing requirements of one groove 21. During the punching process, after the metal sheet substrate is fed in through the feed channel 23, it can sequentially cover multiple parallel grooves 21. When the punch 1 moves downward, the multiple sets of cutting edges 11 and punching cutters 12 simultaneously punch the metal sheet in the multiple grooves 21, producing multiple thin metal bipolar plates in one operation. The scrap after punching is discharged into the unloading table 3 through the unloading holes 24 and unloading grooves 25 corresponding to each groove 21. The finished products remain in each groove 21 or are taken out through the ejection holes 26. By using multiple grooves 21 to share the feeding channel 23 and multiple sets of structures to process synchronously, the feeding auxiliary time for a single product is reduced, enabling multiple products to be punched at once, ensuring the consistency of multiple products, increasing the output per unit time and the stability of batch production, and meeting the needs of large-scale mass production.

[0049] It should also be noted that, without conflict, the embodiments of this utility model and the features therein can be combined with each other to obtain new embodiments.

[0050] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. The scope of protection of the present utility model should be determined by the scope of the claims. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A thin metal bipolar plate punching die, characterized in that, include: The punch (1) has an outwardly protruding blade (11) and a punching tool (12) on its bottom side. The shape of the blade (11) is adapted to the outer contour of the thin metal bipolar plate (4). The punching tool (12) is located in the blade (11) and corresponds to the bipolar position of the thin metal bipolar plate (4). A die (2) is located below the punch (1). A groove (21) is provided on the top side of the die (2). A cutting groove (22) adapted to the cutting edge (11) is provided around the bottom of the groove (21). A feeding channel (23) connected to the side wall of the groove (21) is provided on the side wall of the die (2). A blanking hole (24) and a blanking groove (25) are provided in the groove (21). The blanking hole (24) is located opposite to the punch (12). The blanking groove (25) is located on the side opposite to the feeding channel (23). The blanking platform (3) is located below the die (2). The blanking platform (3) has a blanking channel (31). The upper end of the blanking channel (31) is connected to the blanking hole (24) and the blanking groove (25), and the lower end is connected to the outside of the blanking platform (3).

2. The thin metal bipolar plate punching die according to claim 1, characterized in that, The blade (11) and the punch (12) protrude to the bottom side of the punch (1) at the same height.

3. The thin metal bipolar plate punching die according to claim 1, characterized in that, The bottom side of the punch (1) is provided with a boss (13) that matches the shape of the groove (21). The cutting edge (11) and the punching tool (12) are provided on the bottom side of the boss (13) and the cutting edge (11) is arranged around the boss (13).

4. The thin metal bipolar plate punching die according to claim 1, characterized in that, The punch (1) has an internal threaded hole (14), and the upper end of the punching tool (12) has an external thread. The upper end of the punching tool (12) is threadedly connected to the internal threaded hole (14), and the lower end protrudes to the bottom side of the punch (1).

5. The thin metal bipolar plate punching die according to claim 1, characterized in that, The groove (21) is also provided with a material discharge hole (26) at the bottom.

6. The thin metal bipolar plate punching die according to claim 1, characterized in that, The sidewall of the feed channel (23) is connected to the sidewalls at both ends of the groove (21) to form a whole.

7. The thin metal bipolar plate punching die according to claim 1, characterized in that, The height of the feed channel (23) is greater than the thickness of the thin metal bipolar plate (4).

8. The thin metal bipolar plate punching die according to claim 1, characterized in that, The die (2) has multiple grooves (21) arranged in parallel along the feeding direction of the feeding channel (23), and the adjacent sidewalls of two adjacent grooves (21) are connected; the bottom side of the punch (1) is provided with multiple sets of cutting edges (11) and punching punches (12) in the same number as the multiple grooves (21).

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