mold

Abstract

The application provides a mold, comprising: an upper mold assembly; a lower mold assembly opposite to the upper mold assembly, the lower mold assembly comprising a first forming part and a second forming part, the second forming part being arranged around the first forming part, the first forming part being movably arranged relative to the second forming part to process a first region of a workpiece through the first forming part and process a second region of the workpiece through the second forming part; wherein when the upper mold assembly is in an open position, a first machining surface of the first forming part is higher than a second machining surface of the second forming part. The application solves the problem of low processing efficiency of a metal plate in the prior art.

Description

Technical Field

[0001] This invention relates to the field of metal electrode plate processing mold technology, and more specifically, to a mold. Background Technology

[0002] Fuel cells, especially hydrogen fuel cells, are primarily used in new energy vehicles such as fuel cell-powered cars, buses, trucks, fuel cell locomotives, fuel cell-assisted bicycles, aircraft, and distributed power sources for homes. Their main structure consists of multiple stacked single modules (single cells) with membrane electrode assemblies (MEAs) held between bipolar plates. The bipolar plate is the core component of the fuel cell stack, also known as the "skeleton," and functions to distribute reactant gases, support the MEAs, and collect and guide the water generated after the gas reaction. Based on the substrate material, bipolar plates can be classified as graphite bipolar plates, metal bipolar plates, and composite material bipolar plates. Metal bipolar plates offer advantages such as excellent mechanical strength, high conductivity, good airtightness, and ease of manufacturing and molding. Metal bipolar plates are constructed by welding cathode and anode plates. If the depth deviation between the flow channel and the sealing groove exceeds the tolerance during the molding process, it will affect the sealing performance of the fuel cell. This can cause inconsistent contact between different parts during fuel cell press-fitting, leading to reduced fuel cell performance or potential safety hazards. Meanwhile, because a membrane electrode exists between the two metal bipolar plates, higher forming requirements are placed on the cross-sectional shape of the metal electrode flow channel in order to increase the contact area between the two bipolar plates and the membrane electrode. Therefore, improving the forming precision of the metal electrode is a necessary requirement to ensure the quality of the metal bipolar plate.

[0003] Because metal bipolar plates use ultra-thin materials with a thickness of 0.07mm-0.12mm, and because the flow channel shape of the metal plates is complex and the forming area is large, the forming pressure required in the flow channel area during the forming process is greater than that in the outer area. Currently, the main methods for stamping metal plates are: single-step forming, which controls the depth consistency of the plate through depth compensation during processing; and multi-step forming, which achieves the precision requirements of the metal plate. Existing methods for depth control through processing compensation may require multiple trial moldings and processing modifications for different products, which is costly and time-consuming. Multi-step forming, on the other hand, requires multiple sets of molds, which is costly, has a long manufacturing cycle, and requires high repeatability and positioning accuracy of the product. Both of these forming methods reduce the processing efficiency of metal plates. Summary of the Invention

[0004] The main objective of this invention is to provide a mold to solve the problem of low processing efficiency of metal electrode plates in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, a mold is provided, comprising: an upper mold assembly; and a lower mold assembly opposite to the upper mold assembly, the lower mold assembly including a first forming portion and a second forming portion, the second forming portion being disposed around the first forming portion, the first forming portion being movably disposed relative to the second forming portion, so as to process a first region of a workpiece by means of the first forming portion and to process a second region of a workpiece by means of the second forming portion; wherein, when the upper mold assembly is in an open position, a first processing surface of the first forming portion is higher than a second processing surface of the second forming portion.

[0006] Furthermore, the lower mold assembly also includes: a third forming part, which is disposed around the second forming part and is movably disposed relative to the first forming part; a first positioning part is provided on the third forming part, at least a portion of which contacts the side of the workpiece to position the workpiece.

[0007] Furthermore, the third molding part includes a third molding component, which is disposed around the second molding part; the third molding component is provided with a positioning end face, and a first positioning part is disposed on the positioning end face, which protrudes relative to the positioning end face; when the upper mold assembly is in the open position, the positioning end face is higher than the first processing surface of the first molding part.

[0008] Furthermore, the third forming part includes a third forming member, which is disposed around the second forming part; the third forming member is provided with a positioning end face; the third forming part also includes a second positioning part, which extends along the circumferential direction of the third forming member, protrudes relative to the positioning end face, and at least a portion of the second positioning part is in contact with the workpiece.

[0009] Furthermore, the third molding part includes a third molding component, which is arranged around the second molding part; the lower mold assembly also includes: a lower mold base, on which the first molding part and the second molding part are respectively disposed; and a first elastic member, disposed between the lower mold base and the third molding component, with both ends of the first elastic member connected to the lower mold base and the third molding component respectively, and the first elastic member being elastically disposed.

[0010] Furthermore, the third molded part is provided with a first guide hole, and the lower mold assembly also includes: a first guide member, which is disposed on the lower mold base, and at least a portion of the first guide member passes through the first guide hole to guide the third molded part.

[0011] Furthermore, the third molding part is also provided with a second guide hole, and the lower mold base is provided with a first mounting hole. The lower mold assembly also includes: a limiting component, which is disposed in the first mounting hole. The end of the limiting component away from the lower mold base is inserted into the second guide hole. A first limiting part is provided on the hole wall of the first mounting hole, and a second limiting part is provided on the limiting component. At least a portion of the first limiting part extends toward the center of the first mounting hole. The first limiting part stops the second limiting part to limit the limiting component.

[0012] Furthermore, the first molding part includes a first molding component, and the lower mold assembly further includes: a lower mold base disposed below the first molding component; and a second elastic member disposed between the lower mold base and the first molding component. The second elastic member is telescopically disposed, and its two ends are respectively connected to the lower mold base and the first molding component.

[0013] Furthermore, the lower mold assembly also includes: a first lower pad plate connected to the lower mold base, and a second molding part disposed on the first lower pad plate; a second lower pad plate disposed between the first molding part and the first lower pad plate, the second lower pad plate being fixedly connected to the first molding part, and a gap between the first lower pad plate and the second lower pad plate, and the two ends of the second elastic member being connected to the first lower pad plate and the second lower pad plate respectively.

[0014] Furthermore, the second molding part includes a second molding component, which is fixedly connected to the first lower pad. The second molding component extends circumferentially along the first lower pad to form a limiting space, and the first molding component is disposed within the limiting space.

[0015] According to the technical solution of this invention, the mold includes an upper mold assembly and a lower mold assembly, with the lower mold assembly opposite to the upper mold assembly. The lower mold assembly includes a first forming part and a second forming part, with the second forming part surrounding the first forming part. The position of the first forming part relative to the second forming part is movably configured so that a first area of ​​the workpiece is processed by the first forming part, and a second area of ​​the workpiece is processed by the second forming part. When the upper mold assembly is in the open position, the first processing surface of the first forming part is higher than the second processing surface of the second forming part. This configuration allows for the processing of the workpiece by utilizing the first and second forming parts to process the first and second areas of the product respectively, achieving partitioned forming of the workpiece. Furthermore, by adjusting the position of the first forming part, the force applied to the first area of ​​the workpiece during processing can be adjusted, thereby reducing dimensional deviations caused by excessive deformation of the product under high pressure. After processing, no further manual processing or reprocessing of the workpiece is required, improving processing efficiency. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A schematic diagram of an embodiment of the mold according to the present invention is shown;

[0018] Figure 2 A cross-sectional view of the mold according to the present invention is shown;

[0019] Figure 3 It shows according to Figure 2 Enlarged view of part A;

[0020] Figure 4 An assembly schematic diagram of the limiting component of the mold according to the present invention is shown;

[0021] Figure 5 A schematic diagram of the structure of the workpiece according to the present invention is shown;

[0022] Figure 6 A schematic diagram of the structure of the first processing area of ​​the workpiece according to the present invention is shown;

[0023] Figure 7 A schematic diagram of the structure of the second processing zone of the workpiece according to the present invention is shown.

[0024] The above figures include the following reference numerals:

[0025] 100. Upper mold assembly; 110. Top plate; 120. Upper backing plate; 130. Upper mold core; 140. Second guide component;

[0026] 200. Lower mold assembly; 210. First forming part; 2101. First machined surface; 211. First molded part; 220. Second forming part; 2202. Second machined surface; 221. Second molded part; 230. Third forming part; 231. First positioning part; 232. Third molded part; 2320. Positioning end face; 233. Second positioning part; 240. Lower mold base; 241. First elastic element; 2321. First guide hole; 242. First guide element; 2322. Second guide hole; 2401. First mounting hole; 243. Limiting component; 2420. First limiting part; 2430. Second limiting part; 244. Second elastic element; 251. First lower pad; 252. Second lower pad; 260. Guide sleeve; 270. Lower pad block; 280. Base plate;

[0027] 300. Workpiece; 310. First processing area; 320. Second processing area. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] As mentioned in the background section, when processing metal electrodes, based on their structural characteristics, a flow channel structure needs to be machined in the middle of the electrode, and a sealing groove structure needs to be machined on the side of the flow channel structure. However, since the flow channel structure and the sealing groove structure require different forming pressures during formation, and both structures are machined simultaneously during mold processing, existing methods require manual compensation of the flow channel or sealing groove depth after stamping the electrode to ensure consistency. Alternatively, a multi-step forming method can be used, requiring multiple sets of molds for repeated processing of the metal electrode. However, this multi-mold processing method requires high precision in the repeated positioning of the metal electrode and involves a complex processing flow. Furthermore, manual adjustment after stamping requires setting parameters multiple times for different products, increasing labor intensity and reducing the production efficiency of metal electrodes. Therefore, to address the aforementioned technical problems, in the mold of this application, the lower mold assembly 200 includes a first forming part 210 and a second forming part 220. The second forming part 220 is arranged around the first forming part 210, and the position of the first forming part 210 relative to the second forming part 220 is movably arranged. In this way, the first forming part 210 can be used to process the first area of ​​the workpiece 300, and the second forming part 220 can be used to process the second area of ​​the workpiece. When the upper mold assembly 100 is in the open position, the first processing surface 2101 of the first forming part 210 is higher than the second processing surface 210 of the second forming part 220. 202. During the bonding process between the upper die assembly 100 and the lower die assembly 200, the upper die assembly 100 first bonds with the first area of ​​the workpiece 300 for processing, and then bonds with the second area of ​​the workpiece 300 for processing. This allows for secondary processing of the first area while stamping the second area, enabling control over the forming of different areas of the workpiece 300, improving product precision and forming quality. Furthermore, when the die wears out or requires adjustment, it is easier to repair or replace individual forming parts, reducing die maintenance costs and time, and improving production efficiency. Simultaneously, the zoned forming design makes the overall die structure more flexible, adaptable to different products or forming requirements, enhancing the die's versatility and adaptability.

[0030] Please refer to Figures 1 to 4This application provides a mold, including: an upper mold assembly 100; and a lower mold assembly 200 opposite to the upper mold assembly 100. The lower mold assembly 200 includes a first forming part 210 and a second forming part 220, the second forming part 220 being disposed around the first forming part 210. The position of the first forming part 210 relative to the second forming part 220 is movably disposed so that a first region of a workpiece 300 is processed by the first forming part 210, and a second region of the workpiece 300 is processed by the second forming part 220. When the upper mold assembly 100 is in the open position, the first processing surface 2101 of the first forming part 210 is higher than the second processing surface 2202 of the second forming part 220.

[0031] According to the mold provided in this application, there are upper mold assembly 100 and lower mold assembly 200. The lower mold assembly 200 is opposite to the upper mold assembly 100. The lower mold assembly 200 includes a first forming part 210 and a second forming part 220. The second forming part 220 is arranged around the first forming part 210. The position of the first forming part 210 relative to the second forming part 220 is movably arranged so that a first area of ​​the workpiece 300 is processed by the first forming part 210 and a second area of ​​the workpiece 300 is processed by the second forming part 220. When the upper mold assembly 100 is in the open position, the first processing surface 2101 of the first forming part 210 is higher than the second processing surface 2202 of the second forming part 220. This configuration allows for the processing of workpiece 300 by utilizing the first forming part 210 and the second forming part 220 to process the first and second regions of the product, respectively, thereby achieving partitioned forming of workpiece 300. Furthermore, by adjusting the position of the first forming part 210, the force applied to the first region of workpiece 300 during processing can be adjusted, thereby reducing dimensional deviations caused by excessive deformation of the product under high pressure. After processing, no further manual processing or reprocessing of workpiece 300 is required, thus improving the processing efficiency of workpieces.

[0032] Specifically, the lower mold assembly 200 further includes: a third forming part 230, disposed around the second forming part 220, and the third forming part 230 is movably disposed relative to the first forming part 210; a first positioning part 231 is provided on the third forming part 230, at least a portion of the first positioning part 231 is inserted into the positioning hole of the workpiece to position the workpiece 300. During processing, the positioning hole on the workpiece 300 contacts the first positioning part 231, positioning the workpiece 300 within a predetermined processing area.

[0033] In the specific implementation process, such as Figure 2 and Figure 3As shown, the third forming part 230 includes a third forming member 232, which surrounds the second forming part 220. A positioning end face 2320 is provided on the third forming member 232, and a first positioning part 231 is disposed on the positioning end face 2320, protruding from the positioning end face 2320. When the upper mold assembly 100 is in the open position, the positioning end face 2320 is higher than the first processing surface 2101 of the first forming part 210. The first positioning part 231 positions the workpiece, ensuring accurate positioning of the workpiece during processing and avoiding processing errors caused by workpiece position deviation. Preferably, the first positioning part 231 is a positioning protrusion, and there are multiple positioning protrusions. These multiple positioning protrusions are spaced apart circumferentially along the third forming member 232 to form a limiting space for limiting the workpiece 300.

[0034] In this application, the third molding part 230 includes a third molding member 232, which is disposed around the second molding part 220; a positioning end face 2320 is provided on the third molding member 232; the third molding part 230 further includes a second positioning part 233, which extends along the circumferential direction of the third molding member 232, protrudes relative to the positioning end face 2320, and at least a portion of the second positioning part 233 is in contact with the workpiece 300. Preferably, the second positioning part 233 is located on the side of the first positioning part 231 near the second forming part 220. Preferably, the second positioning part 233 is a positioning rib. During the processing of the workpiece 300, it is beneficial to control the flow deformation of the sheet metal during the forming process. When the force between the positioning rib and the workpiece 300 is too large, the force of the positioning rib to block the deformation of the workpiece 300 increases, and the workpiece 300 is more likely to wrinkle. When the force between the positioning rib and the workpiece 300 is too small, the deformation flow performance of the workpiece 300 increases, and the workpiece 300 is more likely to deform and warp.

[0035] like Figure 2As shown, the third forming part 230 includes a third forming component 232, which surrounds the second forming part 220. The lower mold assembly 200 further includes a lower mold base 240, on which the first forming part 210 and the second forming part 220 are respectively disposed. A first elastic member 241 is disposed between the lower mold base 240 and the third forming component 232, with both ends of the first elastic member 241 connected to the lower mold base 240 and the third forming component 232 respectively. The first elastic member 241 is elastically disposed. Preferably, the first elastic member 241 is a spring. The elastic force of the first elastic member 241 provides force for the movement and reset of the third forming component 232. Before the mold closes, the third forming component 232 is held at a certain height by the action of the spring, higher than the first forming component 211 and the second forming component 221. When the metal sheet is placed in the mold, the spring allows the third forming component 232 to gently press the sheet, ensuring that the sheet is in the correct position, reducing the displacement of the sheet during the forming process, and improving the positioning accuracy of the formed product. The spring also provides cushioning for the third forming part 232 during its vertical movement, preventing damage to the sheet metal due to sudden impacts or pressure changes. Simultaneously, the spring, in conjunction with the first guide part 242, ensures precise vertical guidance of the third forming part 232, allowing it to move smoothly and accurately when pressing and releasing the sheet metal, reducing wear on the mold and the sheet metal. The spring pressure can be preset to accommodate sheet metal of different thicknesses or hardnesses. During mold closing, as the upper mold core is pressed down, the spring under the third forming part 232 gradually compresses, providing pre-forming pressure to the sheet metal. When the upper mold core is in contact with the first forming part 211 and is pressed down further, the third forming part 232 moves together with the first forming part 211. At this time, the spring compression increases, providing additional pressure for the secondary forming of the sheet metal until the final forming pressure is reached. When the mold opens, the spring quickly returns to its original state, causing the third forming part 232 to rise and detach from the sheet metal, allowing the formed metal electrode plate to be easily removed from the mold, improving production efficiency. At the same time, the rapid return of the spring reduces the resistance when removing the product, avoiding additional stress or deformation to the molded product during the removal process.

[0036] By connecting the spring to the third forming component 232, this mold design enables pre-positioning, pre-clamping, pressure adjustment, and rapid release of the sheet metal, improving the forming accuracy and efficiency of the metal electrode plate while reducing mold maintenance costs and cycles. The use of the spring makes the mold more flexible during operation, adapting to the forming needs of different products and enhancing its versatility and production adaptability.

[0037] Furthermore, the third molded part 232 is provided with a first guide hole 2321, and the lower mold assembly 200 also includes a first guide member 242, which is disposed on the lower mold base 240. At least a portion of the first guide member 242 passes through the first guide hole 2321 to guide the third molded part 232. Wherein, the first guide member 242, passing through the first guide hole 2321, not only guides the third molded part 232 during the pressing process of the upper mold assembly 100, but also cooperates with the first inner guide sleeve in the upper mold assembly 100 to guide the upper mold assembly 100.

[0038] The third molded part 232 is also provided with a second guide hole 2322, and the lower mold base 240 is provided with a first mounting hole 2401. The lower mold assembly 200 also includes a limiting member 243, which is disposed in the first mounting hole 2401. One end of the limiting member 243 away from the lower mold base 240 is inserted into the second guide hole 2322. A first limiting part 2420 is provided on the hole wall of the first mounting hole 2401, and a second limiting part 2430 is provided on the limiting member 243. At least a portion of the first limiting part 2420 extends toward the center of the first mounting hole 2401, and the first limiting part 2420 stops the second limiting part 2430 to limit the limiting member 243. The setting of the limiting member 243 not only ensures the movement range of the third molded part, but also improves the safety and reliability of the processing. In the forming and processing of complex curved surface workpieces, such as mobile phone casings and automotive dashboards, the workpieces often have complex geometric features and require precision forming in multiple directions. This mold design uses a limiting component to precisely control the movement of the third forming part, avoiding forming errors caused by excessive movement, ensuring high-precision forming of complex curved surface workpieces, and reducing the risk of equipment damage due to excessive mold movement. Preferably, the limiting component 243 is a limiting bolt. In this application, the limiting bolt passes through the guide sleeve, and the second limiting part 2430 is disposed on the guide sleeve. The second limiting part 2430 has a stepped structure and abuts against the first limiting part 2420 to achieve the purpose of limiting.

[0039] In this application, a second mounting hole is provided on the first lower pad 251. The diameter of the second mounting hole is smaller than the diameter of the first mounting hole 2401. This forms a stepped end face between the first mounting hole 2401 and the second mounting hole, which mates with the second limiting part 2430, to limit the limiting bolt.

[0040] Furthermore, the first molding section 210 includes a first molding part 211, and the lower mold assembly 200 further includes: a lower mold base 240 disposed below the first molding part 211; and a second elastic member 244 disposed between the lower mold base 240 and the first molding part 211. The second elastic member 244 is telescopically configured, and its two ends are respectively connected to the lower mold base 240 and the first molding part 211. The second elastic member provides elastic support for the first molding part, which helps to maintain close contact between the workpiece and the first molding part during processing, and is particularly suitable for workpieces requiring high-pressure molding. Preferably, the second elastic member 244 is a nitrogen spring.

[0041] Nitrogen springs provide stable and adjustable high pressure, which is crucial in the molding process. Compared to traditional mechanical springs, nitrogen springs maintain more uniform pressure during compression and release, which is essential for ensuring the precision and consistency of the metal plates during molding. Nitrogen springs are used to control the movement of the first molded part relative to the second molded part. In the initial stage of mold closure, the nitrogen spring holds the first molded part in a pre-forming position, at which point the protrusions on the lower mold core pre-form the metal sheet, creating the preliminary shape of the sealing groove. Pre-forming can be performed at lower pressure, helping to improve the molding accuracy of the sealing groove area. As the upper mold core continues to press down and contacts the lower molding plate, the nitrogen spring provides sufficient pressure to allow the lower mold core to press down further together with the floating plate (or upper mold core), achieving secondary molding of the metal sheet's runner area. Secondary molding is performed at higher pressure, which helps ensure high-precision molding of the runner area while avoiding excessive stress and deformation caused by primary molding. The pressure of the nitrogen spring can be adjusted as needed, facilitating mold adjustments. If insufficient or excessive molding pressure is detected during mold use, it can be compensated for by adjusting the pressure of the nitrogen spring without requiring physical modifications to the mold, significantly reducing debugging costs and time. The nitrogen spring absorbs and buffers the impact force during molding, reducing damage to the mold and stamping equipment under high pressure. This helps extend the mold's lifespan and improve equipment stability. The use of nitrogen springs provides flexibility for mold maintenance and adjustment. When a part of the mold (such as the mold core) needs replacement due to wear, the nitrogen spring can be easily disassembled and reinstalled without affecting the function and positioning accuracy of other parts of the mold.

[0042] In the embodiments provided in this application, the lower mold assembly 200 further includes: a first lower pad 251 connected to the lower mold base 240, a second molding part 220 disposed on the first lower pad 251; a second lower pad 252 disposed between the first molding part 211 and the first lower pad 251, the second lower pad 252 being fixedly connected to the first molding part 211, a gap being between the first lower pad 251 and the second lower pad 252, and the two ends of the second elastic member 244 being connected to the first lower pad 251 and the second lower pad 252 respectively.

[0043] The second forming section 220 includes a second forming member 221, which is fixedly connected to a first lower pad 251. The second forming member 221 extends circumferentially along the first lower pad 251 to form a limiting space, and the first forming member 211 is disposed within the limiting space. The first / second lower pads provide stable support for both the first and second forming members, and the height of the first forming member can be adjusted by a second elastic member, making it suitable for workpieces requiring forming at different heights.

[0044] The relative movement of the first forming part 210 and the second forming part 220 enables precise machining of different areas of the workpiece, improving processing efficiency and accuracy. Simultaneously, the positioning of the workpiece by the third forming part 230 ensures its stability during machining, further enhancing processing quality. The inclusion of elastic components provides a buffering effect during mold opening and closing, extending mold life and reducing maintenance costs. The use of guide and limiting components ensures precise alignment and stable operation between components, improving the overall performance of the mold. This design not only optimizes the mold structure but also improves production efficiency.

[0045] The second forming part 221, the first lower pad 251, the lower mold base 240, the lower pad block 270, and the base plate 280 are fixed together by bolts and pins, forming a single unit fixed to the lower worktable of the press. The third forming part 232 is driven by the first elastic element, guided by the first guide element, and limited by the limiting component 243, and has a relative movement relationship with the fixed part of the lower mold. The first forming part and the second lower pad 252 are fixed together by bolts and pins, forming a single unit. This unit is driven by the second elastic element 244, guided by the guide post, and limited by bolts, and also has a relative movement relationship with the fixed part of the lower mold. The floating height of the third forming part is greater than that of the first forming part.

[0046] A first inner guide sleeve is installed on the third forming part 232, which slides and engages with the first guide part 242 installed on the first lower pad 251, guiding the third forming part during its up-and-down movement. A limiting bolt is installed on the lower side of the third forming part, limiting it to the lower mold base. The limiting bolt passes through the first lower pad, and its sleeve mounting surface fits against the first lower pad 251 to limit the third forming part. A limiting bolt clearance hole is machined on the lower mold base 240. A first elastic element 241 is also installed between the third forming part 232 and the lower mold base 240, passing through a through hole in the first lower pad 251. Two first positioning parts 231 are installed on the front, rear, left, and right sides of the third forming part 232 for positioning the sheet metal.

[0047] The first molding part 211 and the second lower pad 252 are fixed together by bolts and positioned by pins to form a whole. An inner guide post is installed on the second lower pad 252, which slides with the second inner guide sleeve installed on the first lower pad 251, guiding the first molding part 211 during its up-and-down movement. A limiting bolt is installed on the lower side of the second lower pad 252, passing through the first lower pad. The limiting bolt limits the first molding part through the sleeve mounting of the limiting bolt and the mating surface of the lower side of the second lower pad. A limiting bolt clearance hole is machined on the lower mold base 240. A nitrogen spring (second elastic element 244) is also installed between the second lower pad 252 and the lower mold base 240, passing through a through hole in the lower pad and positioned between the second lower pad 252 and the lower mold base 240.

[0048] The mold in this application, taking the processing of metal sheets as an example, is as follows: Figures 5 to 7 As shown, the metal sheet has a first processing area 310 and a second processing area 320. The first processing area 310 processes a flow channel structure, and the second processing area 320 processes a sealing groove structure. Before the press moves, the mold is in the open state, with the upper and lower mold frames completely separated. The metal sheet is placed into the positioning block of the third forming part. At this time, due to the presence of the spring, the third forming part 232 floats up, with its upper surface higher than the upper surface of the first forming part and higher than the upper surface of the forming plate. Due to the presence of the nitrogen spring, the first forming part is also in a floating state, with a floating height higher than the forming plate but lower than the third forming part.

[0049] During mold operation, the upper slide of the press drives the upper mold frame to move downwards. The upper mold assembly 100 includes an interconnected top plate 110, an upper pad plate 120, and an upper mold core 130. As the press continues to move downwards, the second guide member 140 installed on the upper mold frame begins to contact the guide sleeve 260 installed on the lower mold frame. As the press continues to move downwards, the second guide member 140 enters the guiding state. When the guiding amount of the second guide member 140 reaches 30mm-50mm, the third inner guide sleeve installed on the upper mold core 130 begins to guide the first guide member 242 passing through the third forming part on the lower mold frame. When the guiding amount of the first guide member 242 reaches 10mm-20mm, the upper mold core 130 contacts the third forming part first. As the press continues to move downwards, the helical spring on the lower side of the third forming part begins to compress, and the metal sheet is pressed between the upper mold core and the third forming part. After the third forming part moves downwards with the press a certain distance, the upper mold core fits into the first forming part. The press continues to move downwards and apply pressure. Because a nitrogen spring is installed under the second lower pad, the overall pressure is relatively high. At this point, the metal sheet between the first forming part begins to deform under the pressure. However, since the force provided by the nitrogen spring does not reach the forming pressure of the product flow channel, the flow channel area is pre-formed. When the pressure applied by the press exceeds the sum of the total pressure of all nitrogen springs in the lower die and the total pressure of all springs in the third forming part, the third forming part continues to move downwards with the first forming part along with the upper die. This continues until the upper die core is in contact with the forming plate. At this point, all components of the die are in contact, and the press continues to apply pressure until the required process pressure is reached, simultaneously reaching the lowest point of the press's operation. The middle area of ​​the product undergoes secondary forming, and the sealing groove area undergoes initial forming, achieving the required product dimensions. As the press moves upwards, the various parts of the die operate in the opposite manner to when the press moves downwards. Each moving part releases sequentially, ultimately completing the separation of the upper and lower dies. The press returns to its highest point, completing one full working stroke. After stamping, the product is removed. Using the die in the above embodiment improves the consistency between the sealing groove depth and the flow channel depth on the metal electrode plate, improving product precision and forming quality.

[0050] After stamping, measure the product dimensions. If a depth difference is found between the sealing groove area and the flow channel area, the mold can be disassembled and adjusted by adding shims under the forming plate or under the first forming part. It is not necessary to correct the mold by machining.

[0051] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0052] According to the mold provided in this application, there are upper mold assembly 100 and lower mold assembly 200. The lower mold assembly 200 is opposite to the upper mold assembly 100. The lower mold assembly 200 includes a first forming part 210 and a second forming part 220. The second forming part 220 is arranged around the first forming part 210. The position of the first forming part 210 relative to the second forming part 220 is movably arranged so that a first area of ​​the workpiece 300 is processed by the first forming part 210 and a second area of ​​the workpiece 300 is processed by the second forming part 220. When the upper mold assembly 100 is in the open position, the first processing surface 2101 of the first forming part 210 is higher than the second processing surface 2202 of the second forming part 220. This configuration allows for the processing of workpiece 300 by utilizing the first forming part 210 and the second forming part 220 to process the first and second regions of the product, respectively, thereby achieving partitioned forming of workpiece 300. Furthermore, by adjusting the position of the first forming part 210, the force applied to the first region of workpiece 300 during processing can be adjusted, thereby reducing dimensional deviations caused by excessive deformation of the product under high pressure. After processing, no further manual processing or reprocessing of workpiece 300 is required, thus improving the processing efficiency of workpieces.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A mold, characterized in that, include: Upper mold assembly (100); The lower mold assembly (200) is opposite to the upper mold assembly (100). The lower mold assembly (200) includes a first forming part (210) and a second forming part (220). The second forming part (220) is disposed around the first forming part (210). The position of the first forming part (210) relative to the second forming part (220) is movably disposed so that a first area of ​​the workpiece (300) is processed by the first forming part (210), and a second area of ​​the workpiece (300) is processed by the second forming part (220). When the upper mold assembly (100) is in the open position, the first processing surface (2101) of the first molding part (210) is higher than the second processing surface (2202) of the second molding part (220). The lower mold assembly (200) also includes: A third molding part (230) is disposed around the second molding part (220), and the third molding part (230) is movably disposed relative to the first molding part (210); The third forming part (230) is provided with a first positioning part (231), at least a portion of the first positioning part (231) is aligned with the side of the workpiece (300) to position the workpiece (300); The third molding part (230) includes a third molding member (232) which is disposed around the second molding part (220); The third molded part (232) is provided with a positioning end face (2320), and the first positioning part (231) is provided on the positioning end face (2320), and the first positioning part (231) protrudes from the positioning end face (2320); When the upper mold assembly (100) is in the open position, the positioning end face (2320) is higher than the first processing surface (2101) of the first forming part (210). The first molding part (210) includes a first molding component (211), and the lower mold assembly (200) further includes: The lower mold base (240) is located below the first molded part (211); The second elastic element (244) is disposed between the lower mold base (240) and the first molding part (211). The second elastic element (244) is telescopically disposed, and its two ends are respectively connected to the lower mold base (240) and the first molding part (211).

2. The mold according to claim 1, characterized in that, The third molding part (230) includes a third molding component (232), which is disposed around the second molding part (220); the third molding component (232) is provided with a positioning end face (2320). The third molding section (230) also includes: The second positioning part (233) extends along the circumferential direction of the third molded part (232), the second positioning part (233) protrudes relative to the positioning end face (2320), and at least a portion of the second positioning part (233) is in contact with the workpiece (300).

3. The mold according to claim 1, characterized in that, The third molding section (230) includes a third molding component (232) disposed around the second molding section (220); the lower mold assembly (200) further includes: The lower mold base (240) has the first molding part (210) and the second molding part (220) respectively disposed on the lower mold base (240); A first elastic element (241) is disposed between the lower mold base (240) and the third molding component (232). The two ends of the first elastic element (241) are respectively connected to the lower mold base (240) and the third molding component (232). The first elastic element (241) can be elastically disposed.

4. The mold according to claim 3, characterized in that, The third molding part (232) is provided with a first guide hole (2321), and the lower mold assembly (200) further includes: A first guide member (242) is disposed on the lower mold base (240), and at least a portion of the first guide member (242) passes through the first guide hole (2321) to guide the third molded part (232).

5. The mold according to claim 3, characterized in that, The third molding part (232) is also provided with a second guide hole (2322), the lower mold base (240) is provided with a first mounting hole (2401), and the lower mold assembly (200) further includes: A limiting component (243) is disposed in the first mounting hole (2401). The end of the limiting component (243) away from the lower mold base (240) is inserted into the second guide hole (2322). A first limiting part (2420) is provided on the hole wall of the first mounting hole (2401). A second limiting part (2430) is provided on the limiting component (243). At least a portion of the first limiting part (2420) extends toward the center of the first mounting hole (2401). The first limiting part (2420) stops the second limiting part (2430) to limit the limiting component (243).

6. The mold according to claim 1, characterized in that, The lower mold assembly (200) also includes: The first lower pad (251) is connected to the lower mold base (240), and the second forming part (220) is disposed on the first lower pad (251); The second lower pad (252) is disposed between the first molded part (211) and the first lower pad (251). The second lower pad (252) is fixedly connected to the first molded part (211). There is a gap between the first lower pad (251) and the second lower pad (252). The two ends of the second elastic member (244) are respectively connected to the first lower pad (251) and the second lower pad (252).

7. The mold according to claim 6, characterized in that, The second molding part (220) includes a second molding member (221), which is fixedly connected to the first lower pad (251). The second molding member (221) extends circumferentially along the first lower pad (251) to form a limiting space, and the first molding member (211) is disposed within the limiting space.

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