Device and method for optimizing hidden crack of punch forming characteristic of polar plate

Abstract

The invention relates to a device and method for optimizing hidden cracks of punch forming characteristics of a pole plate, and the method comprises the steps: placing a base material on the surface of a matching assembly in the punch forming process; then, the first die plate is driven to move towards the matching assembly, due to the fact that one of the first male die and the second male die is supported by the elastic piece, the first die plate can be preferentially matched with the one supported by the elastic piece, and the base material is stamped to form an intermediate plate; then, the first die plate is continuously driven to move, the elastic piece is compressed, and the first die plate, the first male die and the second male die are subjected to press fitting. And at the moment, the stamping convex part is in stamping fit with the matching concave part, and the stamping concave part is in stamping fit with the matching convex part, so that the middle plate is molded into the polar plate. Therefore, the device is divided into two-step pressure-bearing forming, the shearing force of one-time forming is reduced, the flowing range and the degree of freedom of the edge of the polar plate in the material forming process are enlarged, materials needed by middle forming of the polar plate are effectively supplemented, and the forming defect probability of hidden cracks and uneven runners is reduced.

Description

Technical Field

[0001] This application relates to the technical field of plate stamping forming, and particularly to a device and method for optimizing the recessive hidden cracks in the stamping forming characteristics of plates. Background Art

[0002] A fuel cell is a device that directly converts the chemical energy of fuel into electrical energy, and it is composed of multiple single cells stacked together. A single cell includes a plate and a membrane electrode. The plates are divided into an anode plate and a cathode plate. Hydrogen is introduced into the anode plate as fuel, and air is introduced into the cathode plate as an oxidant. Under the connection of a load, hydrogen and oxygen react to generate electrical energy. Among them, the plates have multiple important functions such as collecting and conducting current, supporting the membrane electrode, uniformly transporting and isolating reaction gases, circulating coolant, and quickly dissipating heat.

[0003] To optimize the performance of fuel cells, a concave or wavy flow channel structure is usually provided on the surface of the plates. The plates are usually formed by a stamping forming device, for example: using an upper template and a lower template to cooperate and squeeze the plates up and down to obtain different-shaped flow channel structures on the surface of the plates. However, limited by the structural design of traditional stamping forming devices, there are many forming defects such as recessive hidden cracks and uneven flow channels, resulting in a low product yield. Summary of the Invention

[0004] Based on this, it is necessary to provide a device and method for optimizing the recessive hidden cracks in the stamping forming characteristics of plates, reducing the probability of forming defects such as recessive hidden cracks and uneven flow channels, and improving the product yield.

[0005] A device for optimizing the recessive hidden cracks in the stamping forming characteristics of plates includes: a bearing assembly; a first template located above the bearing assembly, and a plurality of stamping protrusions and stamping recesses are alternately arranged on the surface thereof facing the bearing assembly; a matching assembly located between the bearing assembly and the first template; wherein, the matching assembly includes an elastic member, a plurality of first punches and a plurality of second punches. The first punches are arranged at intervals along a first direction, and an embedding gap is formed on at least one side of each first punch along the first direction. Each second punch is embedded in the corresponding embedding gap; one end of each first punch is provided with a matching protrusion for matching with the stamping recess, and one end of each second punch is provided with a matching recess for matching with the stamping protrusion. The elastic member is supported between the bearing assembly and each first punch or each second punch, so that one of the first punch and the second punch is in stamping cooperation with the first template prior to the other.

[0006] The above device for optimizing the recessive hidden cracks in the stamping forming characteristics of the plate electrode places a base material on the surface of the matching component during the stamping forming process. Then, the first template is driven to move towards the matching component. Since one of the first punch and the second punch is supported by an elastic member, the first template can preferentially cooperate with the one supported by the elastic member to stamp the base material to form an intermediate plate member. Then, the first template is continuously driven to move, compressing the elastic member so that the first template is press-fitted with both the first punch and the second punch. At this time, the stamping convex part and the matching concave part are stamped and matched, and the stamping concave part and the matching convex part are stamped and matched, so that the intermediate plate member is formed into a plate electrode. It can be seen that this device is formed under pressure in two steps, reducing the shear force of one-time forming and increasing the range and freedom of the material flow at the edge of the plate electrode during the material forming process, effectively supplementing the materials required for the middle forming of the plate electrode. In this way, the single forming height and the forming thinning rate are reduced, thereby reducing the probability of forming defects such as recessive hidden cracks and uneven flow channels, and improving the product yield.

[0007] In some embodiments, the matching component further includes an inner mold and an outer mold sleeved outside the inner mold. The inner mold and the outer mold are both arranged on the bearing component. Each of the first punches is arranged at intervals along the first direction on the surface of the inner mold facing the first template. Both ends of each of the second punches along the second direction intersecting the first direction are connected to the outer mold, and the elastic member is supported between the outer mold and the bearing component.

[0008] In some embodiments, the elastic member is configured to drive the matching concave part to extend beyond the matching convex part along the third direction when the first template and the matching component are in a separated state in the third direction. Wherein, the first direction, the second direction and the third direction intersect pairwise and the three are not coplanar.

[0009] In some embodiments, the matching component further includes a first backing plate. The first backing plate is arranged on the bearing component. The inner mold and the outer mold are both arranged on the first backing plate. The first backing plate is provided with through holes, and the elastic member passes through the through holes and abuts between the outer mold and the bearing component.

[0010] In some embodiments, the outer mold includes a first part and a second part connected to each other. The first part and the second part are located on opposite sides of the inner mold along the first direction, and the first part and / or the second part is supported on the bearing component by the elastic member.

[0011] In some embodiments, mounting holes are provided on the surface of the first part and / or the second part facing the bearing component, and one end of the elastic member is inserted into the mounting holes.

[0012] In some of these embodiments, both ends of each of the stamping protrusions in the first direction include arc-shaped concave walls, and both ends of each of the mating protrusions in the first direction include arc-shaped convex walls, and the arc-shaped convex walls are arranged corresponding to the arc-shaped concave walls.

[0013] In some of these embodiments, one of the first punches is a first allowance punch, the size of the mating concave portion of the first allowance punch in the first direction is larger than the sizes of the other mating concave portions, one of the second punches is a second allowance punch, the size of the mating convex portion of the second allowance punch in the first direction is larger than the sizes of the other mating convex portions, and at least one of the first punches and at least one of the second punches are distributed between the first allowance punch and the second allowance punch.

[0014] In some of these embodiments, it further includes a second template and a guiding member. The second template is sleeved outside the mating assembly and is arranged on the bearing assembly, and the guiding member is arranged between the first template and the second template for guiding the movement between the first template and the second template.

[0015] A method for optimizing the recessive hidden cracks in the stamping forming features of the electrode plate, using the device for optimizing the recessive hidden cracks in the stamping forming features of the electrode plate according to any one of the above, the method includes the following steps: placing a base material on the surface of the mating assembly facing the first template; driving the first template to move towards the mating assembly so that the stamping protrusions are engaged with the mating concave portions, or the stamping concave portions are engaged with the mating convex portions, and stamping the base material to form an intermediate plate; driving the first template to continue moving so that the stamping protrusions are engaged with the mating concave portions and the stamping concave portions are engaged with the mating convex portions, and stamping the intermediate plate to form an electrode plate; after maintaining the pressure for a preset time, separating the first template from the mating assembly.

[0016] The above method for optimizing the recessive hidden cracks in the stamping forming characteristics of the electrode plate uses the above device for optimizing the recessive hidden cracks in the stamping forming characteristics of the electrode plate. During the stamping forming process, a base material is placed on the surface of the fitting assembly. Then, the first template is driven to move towards the fitting assembly. Since one of the first punch and the second punch is supported by an elastic member, the first template can first cooperate with the one supported by the elastic member to stamp the base material to form an intermediate plate member. Then, the first template is continuously driven to move, compressing the elastic member so that the first template is press-fitted with both the first punch and the second punch. At this time, the stamping convex part and the fitting concave part are press-fitted, and the stamping concave part and the fitting convex part are press-fitted, so that the intermediate plate member is formed into an electrode plate. It can be seen that this device is formed by two-step pressure bearing, reducing the shear force of one-time forming and increasing the range and freedom of the flow of the electrode plate edge during the material forming process, effectively supplementing the materials required for the intermediate forming of the electrode plate. In this way, the single forming height and the forming thinning rate are reduced, thereby reducing the probability of forming defects such as recessive hidden cracks and uneven flow channels, and improving the product yield rate.

[0017] In some of the embodiments, in the step of driving the first template to move towards the fitting assembly, the stamping convex part and the fitting concave part cooperate to stamp the base material to form the intermediate plate member. Wherein, the flow channel height of the intermediate plate member is denoted as h1, the ridge width of the flow channel of the intermediate plate member is denoted as W1, the flow channel height of the electrode plate is denoted as h2, and the ridge width of the corresponding flow channel on the electrode plate and the intermediate plate is denoted as W2, and h2≥1.2h1, W1≥1.4W2. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the device described in some embodiments of the present application.

[0019] Figure 2 It is a structural sectional view of the device described in some embodiments of the present application.

[0020] Figure 3 For Figure 2 The enlarged view of the structure at circle A in

[0021] Figure 4 It is a structural sectional view of the cooperation between the first template and the fitting assembly described in some embodiments of the present application.

[0022] Figure 5 For Figure 4 The enlarged view of the structure at circle B in

[0023] Figure 6 For Figure 4 The enlarged view of the structure at circle C in

[0024] Figure 7 For Figure 4 The enlarged view of the structure at circle D in

[0025] Figure 8 For Figure 4 An enlarged view of the structure at the middle circle E.

[0026] Figure 9 A schematic structural view of the substrate described in some embodiments of the present application.

[0027] Figure 10 A schematic structural view of the intermediate plate member described in some embodiments of the present application.

[0028] Figure 11 A schematic structural view of the electrode plate described in some embodiments of the present application.

[0029] Figure 12 A flowchart of the method described in some embodiments of the present application.

[0030] 10. First template; 11. Stamping convex part; 111. Arc concave wall; 12. Stamping concave part; 13. First convex part; 14. Second convex part; 20. Fitting component; 21. First punch; 211. Fitting convex part; 21a. Arc convex wall; 22. Second punch; 221. Fitting concave part; 22a. Bottom wall; 22b. Protruding part; 23. Embedding gap; 24. First surplus punch; 25. Second surplus punch; 26. Inner mold; 27. Outer mold; 271. First part; 272. Second part; 273. Mounting hole; 274. First concave part; 275. Second concave part; 28. Elastic member; 29. First backing plate; 291. Through hole; 30. Carrying component; 31. Third backing plate; 32. Second die holder; 33. Die set; 34. Support plate; 35. Base; 40. Second template; 41. Guide member; 50. First die holder; 51. Second backing plate; 52. Height limiting column; X. First direction; Y. Second direction; Z. Third direction; 100. Substrate; 200. Intermediate plate member; 300. Electrode plate; 400. Flow channel. Detailed implementation manners

[0031] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe the detailed implementation manners of the present application in conjunction with the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present application.

[0033] In addition, if there are terms such as "first" and "second", these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if there is a term "plurality", the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0034] In the present application, unless otherwise clearly specified and limited, if there are terms such as "mounted", "connected", "coupled", "fixed", etc., these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0036] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0037] In some embodiments, please refer to Figures 1 to 4 , this application provides a device for optimizing the recessive hidden cracks in the stamping forming characteristics of a plate electrode, including: a carrying component 30, a first template 10 and a matching component 20. The first template 10 is located above the carrying component 30, and a plurality of alternately arranged stamping protrusions 11 and stamping recesses 12 are provided on the surface facing the carrying component 30. The matching component 20 is located between the carrying component 30 and the first template 10. Among them, the matching component 20 includes an elastic member 28, a plurality of first punching dies 21 and a plurality of second punching dies 22. The first punching dies 21 are arranged at intervals along the first direction X, and an embedding gap 23 is formed on at least one side of each first punching die 21 along the first direction X. Each second punching die 22 is embedded in the corresponding embedding gap 23. One end of each first punching die 21 is provided with a matching protrusion 211 for matching with the stamping recess 12, and one end of each second punching die 22 is provided with a matching recess 221 for matching with the stamping protrusion 11. The elastic member 28 is supported between the carrying component 30 and each first punching die 21 or each second punching die 22, so that one of the first punching die 21 and the second punching die 22 is in stamping cooperation with the first template 10 prior to the other.

[0038] For the above-mentioned device for optimizing the recessive hidden cracks in the stamping forming characteristics of a plate electrode, during the stamping forming process, a base material 100 is placed on the surface of the matching component 20; then, the first template 10 is driven to move towards the matching component 20. Since one of the first punching die 21 and the second punching die 22 is supported by the elastic member 28, the first template 10 can preferentially cooperate with the one supported by the elastic member 28 to stamp the base material 100 to form an intermediate plate member 200; then, the first template 10 is continuously driven to move, compressing the elastic member 28, so that the first template 10 is press-fitted with both the first punching die 21 and the second punching die 22. At this time, the stamping protrusion 11 is in stamping cooperation with the matching recess 221, and the stamping recess 12 is in stamping cooperation with the matching protrusion 211, so that the intermediate plate member 200 is formed into a plate electrode 300. It can be seen that this device is formed by two-step pressure bearing, reducing the shearing force of one-time forming and increasing the range and freedom of the flow of the edge of the plate electrode 300 during the material forming process, effectively supplementing the materials required for the intermediate forming of the plate electrode 300. In this way, the single forming height and the forming thinning rate are reduced, thereby reducing the probability of forming defects such as recessive hidden cracks and uneven flow channels 400 and improving the product yield.

[0039] It should be noted that during the stamping process, the fluidity of the base material 100 decreases with the increase in the distance from the edge. As a result, at the same stamping depth, the plastic deformation of the runner 400 in the middle of the base material 100 is greater than that of the runner 400 at the edge, leading to a greater internal stress in the middle of the electrode plate 300. After unloading, the springback deformation of the runner 400 in the middle is greater than that of the runner 400 at the edge, resulting in the depth of the runner 400 at the edge being greater than that of the middle runner 400, thus causing uneven runners 400 in the electrode plate 300. At the same time, during the stamping process, the internal stress and springback deformation suffered by the base material 100 are different, and hidden cracks are likely to occur. Among them, hidden cracks refer to the fine crack defects that are not obvious on the surface or inside of the material after forming and are difficult to directly observe with the naked eye. They can be detected by means such as fluorescent penetration, ultrasonic flaw detection, and metallographic analysis.

[0040] Therefore, in this embodiment, the elastic member 28 is used to make one of the first punch 21 and the second punch 22 press-fit with the first template 10 prior to the other, so that the base material 100 forms the intermediate plate member 200; then, further pressing down forms the final required electrode plate 300 from the intermediate plate member 200. This can reduce the shear force generated by one-time forming; at the same time, it is also beneficial to increase the flow range and freedom of the material at the edge, supplement the material required for forming in the middle, thereby reducing the plastic deformation generated by the runner 400 in the middle of the base material 100 and reducing the accumulation of internal stress. In this way, through the step-by-step stamping method, the single forming height of the runner 400 and the forming thinning rate of the electrode plate 300 are reduced, which is beneficial to reducing the probability of forming defects such as hidden cracks and uneven runners 400 and improving the product yield.

[0041] Among them, please refer to Figures 9 to 11 , the base material 100 refers to a plate structure whose surface has not been stamped to form the runner 400, and the intermediate plate member 200 refers to the intermediate structure formed by the base material 100 through the first-step stamping. The runner 400 on the surface of the intermediate plate member 200 has not yet reached the required size. The runner 400 refers to a concave-convex structure formed on the surface of the base material 100 under the stamping cooperation of the stamping convex portion 11 and the mating concave portion 221, and the stamping concave portion 12 and the mating convex portion 211. The number and size of the runners 400 can be determined according to actual needs. At the same time, the shape of the runner 400 can also have various designs, such as: a straight runner 400 extending along the second direction Y, etc. In addition, the shapes of the stamping convex portion 11, the stamping concave portion 12, the mating convex portion 211, and the mating concave portion 221 can be designed according to the shape of the runner 400.

[0042] It should also be noted that the elastic member 28 is supported between the bearing assembly 30 and the first punch 21 or the second punch 22, so that the first punch 21 or the second punch 22 can be more likely to be press-fitted with the first template 10 first to complete the first-step stamping of the base material 100. For example, the elastic member 28 is supported between the first punch 21 and the bearing assembly 30, so that the mating convex portion 211 of the first punch 21 cooperates with the stamping concave portion 12 to stamp the base material 100 preferentially; or, the elastic member 28 is supported between the second punch 22 and the bearing assembly 30, so that the mating concave portion 221 of the second punch 22 cooperates with the stamping convex portion 11 to stamp the base material 100 preferentially.

[0043] When the first punch 21 or the second punch 22 is supported on the bearing assembly 30 by the elastic member 28, before stamping, the position of the one supported by the elastic member 28 will be elevated. For example, when the elastic member 28 is supported between the second punch 22 and the bearing assembly 30, before stamping, the position of the mating concave portion 221 of the second punch 22 will be elastically elevated. At this time, the mating concave portion 221 of the second punch 22 can be flush with or exceed the mating convex portion 211 of the first punch 21. Of course, in some examples, the mating concave portion 221 of the second punch 22 is still lower than the mating convex portion 211 of the first punch 21. When the mating concave portion 221 of the second punch 22 exceeds the mating convex portion 211 of the first punch 21 under the action of the elastic member 28, during the stamping process, the stamping convex portion 11 cooperates with the mating concave portion 221 to stamp the base material 100 preferentially. At this time, the stamping concave portion 12 and the mating convex portion 211 have not yet cooperated and cannot stamp the base material 100. As the first template 10 continues to move downward, the second punch 22 compresses the elastic member 28, so that the stamping concave portion 12 cooperates with the mating convex portion 211 and stamps the intermediate plate member 200.

[0044] In addition, the second punch 22 is embedded in the embedding gap 23, so that the first punch 21 and the second punch 22 can move relative to each other under the action of the elastic member 28. Among them, the second punch 22 can be embedded between two adjacent first punches 21, or can be embedded on one side of the first punch 21 located on the outermost side in the first direction X. Specifically, in some examples, an embedding gap 23 is formed between two adjacent first punches 21.

[0045] In the elastic support, each first punch 21 or second punch 22 is connected together in sequence and supported on the bearing assembly 30 through an elastic member 28; alternatively, each first punch 21 or second punch 22 is supported on the bearing assembly 30 by an independent elastic member 28. The structure of the elastic member 28 can have various designs, such as springs, elastic metal sheets, etc. In addition, the elastic member 28 can support the first punch 21 or second punch 22 directly, for example, one end of the elastic member 28 directly abuts against the first punch 21 or second punch 22; or it can support indirectly, for example, the first punch 21 or second punch 22 is connected to an intermediate structure, and one end of the elastic member 28 abuts against the intermediate structure.

[0046] When the elastic member 28 is a spring, its parameter specifications can be adjusted according to the stamping effect; of course, it can also be obtained by calculation using relevant formulas. For example: the total stamping load is T, the number of springs is n, and the force that each spring needs to bear is: F = T / n. The spring deformation X (after the spring deforms by X, the first template 10 cooperates with the first punch 21 and the second punch 22), the mean diameter D of the spring, and the number of turns N of the spring. At this time, the spring stiffness k = F / x, and k = Gd 4 / 8D 3 N, then the wire diameter d of the spring = (8D 3 Nk / G) 1 / 4 .

[0047] Further, please refer to Figure 4 , the cooperation assembly 20 further includes an inner die 26 and an outer die 27 sleeved outside the inner die 26. The inner die 26 and the outer die 27 are both arranged on the bearing assembly 30. Each first punch 21 is arranged at intervals along the first direction X on the surface of the inner die 26 facing the first template 10. Both ends of each second punch 22 along the second direction Y intersecting with the first direction X are connected to the outer die 27. The elastic member 28 is supported between the outer die 27 and the bearing assembly 30. It can be seen that the outer die 27 is sleeved outside the inner die 26, and each second punch 22 extends along the second direction Y to be connected to the outer die 27, so that the outer die 27 and each second punch 22 form a whole. Since the elastic member 28 is supported between the outer die 27 and the bearing assembly 30, therefore, the elastic member 28 can indirectly support the second punch 22, so that the second punch 22 cooperates with the second template 40 prior to the first punch 21 to stamp the base material 100 of the electrode plate 300, realizing effective step-by-step stamping.

[0048] It is not difficult to understand that the outer die 27 is sleeved outside the inner die 26, and it can be seen that the outer die 27 is a ring structure surrounding the outer periphery of the inner die 26. At this time, the second punch 22 embedded between two adjacent first punches 21 has both ends extending outside the embedding gap 23 along the second direction Y and connected to the inner wall of the outer die 27. To improve the stamping effect, the inner wall of the outer die 27 can be attached to the outer wall of the inner die 26, and the second punch 22 is respectively attached to the first punches 21 on both sides.

[0049] In addition, the elastic member 28 provides elastic support for the second punch 22, so that the second punch 22 is moderately lifted before stamping, so that the stamping convex portion 11 cooperates with the mating concave portion 221, and the base material 100 is preferentially stamped. Since the mating concave portion 221 of the second punch 22 is generally lower than the mating convex portion 211 of the first punch 21, even if the mating concave portion 221 is elastically supported by the elastic member 28, the height difference between the position of the mating concave portion 221 and the position of the mating convex portion 211 is not large. This not only satisfies effective step-by-step stamping, but also ensures that the surfaces of the first punch 21 and the second punch 22 are more flat, facilitating the stable placement of the base material 100 on the mating assembly 20, and avoiding the risk of the base material 100 being easily offset due to uneven surfaces, further improving the stamping effect.

[0050] In some embodiments, please refer to Figure 2 , the elastic member 28 is configured to drive the mating concave portion 221 to extend beyond the mating convex portion 211 in the third direction Z when the first template 10 and the mating assembly 20 are in a separated state in the third direction Z, wherein the first direction X, the second direction Y, and the third direction Z intersect pairwise and are not coplanar. It can be seen that before stamping, under the action of the elastic member 28, the mating concave portion 221 of the second punch 22 extends beyond the mating convex portion 211, so that before the first template 10 cooperates with the second punch 22, the second punch 22 has sufficient downward movement space, thereby ensuring that the stamping convex portion 11 and the mating concave portion 221 have an appropriate time to stamp the base material 100 to obtain an intermediate plate member 200 with stable structure, which is beneficial to improving the quality of the first-step stamping.

[0051] It should be noted that the first template 10 and the mating assembly 20 are in a separated state in the third direction Z, indicating that the first template 10 has not yet moved downward toward the mating assembly 20, that is, it can also be understood that the first template 10 and the mating assembly 20 have not performed stamping operations.

[0052] At the same time, the mating concave portion 221 extending beyond the mating convex portion 211 should be understood as the most protruding part of the mating concave portion 221 being higher than the most protruding part of the mating convex portion 211. In some examples, the inner wall of the mating concave portion 221 includes a bottom wall 22a and protruding portions 22b respectively provided at both ends of the bottom wall 22a along the first direction X. When the first template 10 and the mating assembly 20 are in a separated state in the third direction Z, one end of the protruding portion 22b is higher than one end of the mating convex portion 211 in the third direction Z. Among them, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0053] Furthermore, the dimension that the mating concave portion 221 extends beyond the outer dimension of the mating convex portion 211 along the third direction Z under the action of the elastic member 28 is 5 mm to 30 mm. For example, it can be, but is not limited to, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, etc. It can be seen that controlling the dimension that the mating concave portion 221 extends beyond the mating convex portion 211 to be 5 mm to 30 mm enables the second punch 22 and the first template 10 to have sufficient stroke for stamping first, so as to complete the stamping and forming of the intermediate plate member 200; and it also avoids a large surface height difference between the first punch 21 and the second punch 22, which may cause the substrate 100 to be unable to be placed stably.

[0054] Specifically, in some examples, the inner wall of the mating concave portion 221 includes a bottom wall 22a and protruding portions 22b respectively provided at both ends of the bottom wall 22a along the first direction X. The dimension that the protruding portions 22b extend beyond the outer dimension of the mating convex portion 211 along the third direction Z is 5 mm to 30 mm.

[0055] In some embodiments, please refer to Figure 4 , the mating assembly 20 further includes a first backing plate 29. The first backing plate 29 is provided on the bearing assembly 30. The inner die 26 and the outer die 27 are both provided on the first backing plate 29. A through hole 291 is provided on the first backing plate 29. The elastic member 28 passes through the through hole 291 and abuts between the outer die 27 and the bearing assembly 30. In this way, passing the elastic member 28 through the through hole 291 limits the elastic member 28, avoiding structural failure caused by compression during stamping, thereby ensuring that the elastic member 28 stably supports the outer die 27. At the same time, providing the through hole 291 on the first backing plate 29 enables the second punch 22 to move down to the first backing plate 29 during the second-step stamping of the first template 10 and stamp the substrate 100 of the electrode plate 300 together with the second punch 22.

[0056] In some embodiments, please refer to Figure 4 , the outer die 27 includes a first part 271 and a second part 272 that are connected to each other. The first part 271 and the second part 272 are located on opposite sides of the inner die 26 along the first direction X. The first part 271 and / or the second part 272 are supported on the bearing assembly 30 by the elastic member 28. It can be seen that through the elastic support of the elastic member 28 for the first part 271 or the second part 272, the second punch 22 can be preferentially press-fitted with the first template 10 to perform the first-step stamping on the substrate 100 of the electrode plate 300.

[0057] It should be noted that during the first stamping process, the first part 271 and the second part 272 can also be press-fitted with the first template 10 respectively to stamp the base material 100. For example, a first concave portion 274 is provided on the surface of the first part 271, and a first convex portion 13 that cooperates with the first concave portion 274 is provided on the first template 10; a plurality of spaced second concave portions 275 are provided on the surface of the second part 272, and a plurality of spaced second convex portions 14 are provided on the first template 10. Among them, the number of the first concave portion 274 and the second concave portion 275 can be determined according to the number of the flow channels 400 on the electrode plate 300.

[0058] In addition, when both the first part 271 and the second part 272 are supported on the carrier assembly 30 through the elastic members 28, the elastic force received by the outer mold 27 is more balanced, making the stamping of the base material 100 by the second punch 22 more stable and further improving the stamping effect.

[0059] In some embodiments, please refer to Figure 4 , mounting holes 273 are provided on the surfaces of the first part 271 and / or the second part 272 facing the carrier assembly 30, and one end of the elastic member 28 is inserted into the mounting holes 273. It can be seen that inserting the elastic member 28 into the mounting holes 273 enables the elastic member 28 to be stably combined with the first part 271 or the second part 272, preventing the elastic member 28 from detaching from the first part 271 or the second part 272 due to being compressed during the stamping process and ensuring stable stamping.

[0060] It should be noted that the mounting holes 273 can be provided at the bottom of the first part 271 or the second part 272, or can be provided at the bottoms of both the first part 271 and the second part 272. When both the first part 271 and the second part 272 are provided with the mounting holes 273, both the first part 271 and the second part 272 can be supported by the elastic members 28, making the force on the outer mold 27 more balanced.

[0061] Meanwhile, on the first part 271 or the second part 272, the number of the mounting holes 273 can be one or multiple. When there are multiple mounting holes 273, the elastic members 28 can be inserted into each of the mounting holes 273.

[0062] In addition, please refer to Figure 4 , when a first backing plate 29 with a through hole 291 is provided at the bottom of the outer mold 27 and the inner mold 26, the mounting holes 273 can be kept in communication with the through hole 291. In this way, the elastic member 28 passing through the through hole 291 can be easily inserted into the mounting holes 273, not only enabling the stable installation of the elastic member 28, but also facilitating the contraction of the elastic member 28 in the mounting holes 273 and the through hole 291 during the stamping process.

[0063] In some embodiments, please refer to Figure 5 and Figure 6, both ends of each stamping convex portion 11 along the first direction X include arc concave walls 111, both ends of each mating convex portion 211 along the first direction X include arc convex walls 21a, and the arc convex walls 21a are arranged corresponding to the arc concave walls 111. It can be seen from this that when the stamping convex portion 11 cooperates with the mating concave portion 221 to stamp the base material 100, the arc concave wall 111 of the stamping convex portion 11 extrudes the surface of the base material 100, so that one end of the convex surface of the flow channel 400 formed on the base material 100 is an arc angle, avoiding the accumulation of internal stress at one end of the flow channel 400 during stamping and reducing the occurrence of hidden crack defects during the stamping process. When the first template 10 moves down to be press-fitted with the first punch 21, the arc convex wall 21a of the mating convex portion 211 will perform arc extrusion on one end of the concave surface of the flow channel 400, so that the arc angle at one end of the convex surface of the flow channel 400 can stably reach the required size.

[0064] It should be noted that the radius of the arc concave wall 111 can be equal to the radius of the arc convex wall 21a; it can also be greater than the radius of the arc convex wall 21a. When the radius of the arc concave wall 111 is greater than the radius of the arc convex wall 21a, the bending angle of the arc concave wall 111 on one end of the convex surface of the flow channel 400 is smaller, and the formed arc radius is relatively smaller, and the structure forming is more stable. When the first template 10 moves down to be press-fitted with the first punch 21, the arc convex wall 21a will extrude the flow channel 400 into the stamping concave portion 12, which can increase the bending angle of the flow channel 400, so that the arc radius at one end of the convex surface of the flow channel 400 reaches the required size. For details, please refer to Figure 10 and Figure 11 , when the first template 10 is press-fitted with the second punch 22, the arc radius at one corner of the flow channel 400 formed on the surface of the base material 100 is R1; when the first template 10 moves down to be press-fitted with the first punch 21 at the same time, the arc radius at one corner of the flow channel 400 formed on the surface of the base material 100 is R2, where R1≥R2.

[0065] In some embodiments, please refer to Figure 4, where one of the first punch dies 21 is the first allowance punch die 24, and the dimension of the mating concave portion 221 of the first allowance punch die 24 in the first direction X is greater than that of the other mating concave portions 221. One of the second punch dies 22 is the second allowance punch die 25, and the dimension of the mating convex portion 211 of the second allowance punch die 25 in the first direction X is greater than that of the other mating convex portions 211. At least one first punch die 21 and at least one second punch die 22 are distributed between the first allowance punch die 24 and the second allowance punch die 25. It can be seen that when the stamping convex portion 11 mates with the mating concave portion 221 of the first allowance punch die 24, an edge structure with a larger size can be formed on the base material 100, and this edge structure can play a better role in stamping limit. Similarly, when the stamping concave portion 12 mates with the mating convex portion 211 of the second allowance punch die 25, an edge structure with a larger size can also be formed on the base material 100, playing a better role in stamping limit and ensuring stable stamping.

[0066] It should be noted that, please refer to Figure 10 and Figure 11 , in the first-step stamping process, a runner 400 close to the first allowance punch die 24 is formed on the base material 100. The width dimension of the ridge of the runner 400 in the first direction X is denoted as a1. In the second-step stamping process, that is, after the first template 10 and the first punch die 21 are press-fitted, a runner 400 close to the second allowance punch die 25 is formed on the base material 100. The width dimension of the ridge of the runner 400 in the first direction X is denoted as a2. Among them, a1 ≥ 1.4a2.

[0067] In some embodiments, please refer to Figure 2 , it further includes a second template 40 and a guiding member 41. The second template 40 is sleeved outside the mating assembly 20 and is arranged on the bearing assembly 30. The guiding member 41 is arranged between the first template 10 and the second template 40 and is used to guide the movement between the first template 10 and the second template 40. It can be seen that by introducing the guiding member 41, the movement of the first template 10 relative to the second template 40 becomes more stable, which is beneficial to improving the stamping effect.

[0068] For the convenience of pushing the first template 10, please refer to Figure 2 , the device further includes a first die base 50 and a second backing plate 51. The second backing plate 51 is laminated on the surface of the first template 10 facing away from the mating assembly 20, and the first die base 50 is laminated on the second backing plate 51. At the same time, the bearing assembly 30 includes a third backing plate 31, a second die base 32, a die set 33, a base 35 and a support plate 34. The second template 40 and the mating assembly 20 are both arranged on the second die base 32 through the third backing plate 31, and the second die base 32 is arranged on the base 35 through the die set 33. In addition, a height-limiting column 52 is arranged between the first die base 50 and the second die base 32.

[0069] In some embodiments, please refer to Figure 12, this application provides a method for optimizing the recessive hidden cracks in the stamping forming characteristics of the electrode plate. Using the device for optimizing the recessive hidden cracks in the stamping forming characteristics of the electrode plate as described in any of the above, the method includes the following steps:

[0070] S100. Place the base material 100 on the surface of the mating component 20 facing the first template 10;

[0071] S200. Drive the first template 10 to move towards the mating component 20, so that the stamping convex part 11 cooperates with the mating concave part 221, or the stamping concave part 12 cooperates with the mating convex part 211, and stamp the base material 100 to form the intermediate plate member 200;

[0072] S300. Drive the first template 10 to continue moving, so that the stamping convex part 11 cooperates with the mating concave part 221 and the stamping concave part 12 cooperates with the mating convex part 211, and stamp the intermediate plate member 200 to form the electrode plate 300;

[0073] S400. After maintaining the pressure for a preset time, separate the first template 10 from the mating component 20.

[0074] For the above method of optimizing the recessive hidden cracks in the stamping forming characteristics of the electrode plate, using the above device for optimizing the recessive hidden cracks in the stamping forming characteristics of the electrode plate, during the stamping forming process, place the base material 100 on the surface of the mating component 20; then, drive the first template 10 to move towards the mating component 20. Since one of the first punch 21 and the second punch 22 is supported by the elastic member 28, the first template 10 can preferentially cooperate with the one supported by the elastic member 28 and stamp the base material 100 to form the intermediate plate member 200; then, continue to drive the first template 10 to move, compress the elastic member 28, so that the first template 10 is press-fitted with both the first punch 21 and the second punch 22. At this time, the stamping convex part 11 and the mating concave part 221 are stamping and cooperating, and the stamping concave part 12 and the mating convex part 211 are stamping and cooperating, so that the intermediate plate member 200 is formed into the electrode plate 300. It can be seen that this device is formed by bearing pressure in two steps, reducing the shearing force of one-time forming and increasing the range and freedom of the flow of the electrode plate 300 at the edge during the material forming process, effectively supplementing the materials required for the intermediate forming of the electrode plate 300. In this way, the single forming height and the forming thinning rate are reduced, thereby reducing the probability of forming defects such as recessive hidden cracks and uneven runner 400, and improving the product yield.

[0075] It should be noted that the base material 100 refers to a plate structure whose surface has not been stamped to form the runner 400, and the intermediate plate member 200 refers to the intermediate structure formed by the base material 100 through the first-step stamping, and the runner 400 on the surface of the intermediate plate member 200 has not yet reached the required size. Through the step-by-step stamping method of this embodiment, the stamping of a relatively thin base material 100 can be satisfied. For example, the thickness of the base material 100 can be less than or equal to 2 mm, etc.

[0076] In step S400, when the first template 10 is press-fitted with the first punch 21 and the second punch 22 simultaneously, the pressure can be kept constant for a certain period of time, so that the structure of the formed electrode plate 300 is more stable. The preset time can be determined according to the stamping depth, stamping pressure of the base material 100 and the properties of the material, and no specific limitation is made here.

[0077] In some embodiments, please refer to Figures 9 to 11 , in the step of driving the first template 10 to move towards the mating component 20, the stamping convex part 11 and the mating concave part 221 cooperate to stamp the base material 100 to form an intermediate plate member 200. Among them, the height of the flow channel 400 of the intermediate plate member 200 is denoted as h1, the ridge width of the flow channel 400 of the intermediate plate member 200 is denoted as W1, the height of the flow channel 400 of the electrode plate 300 is denoted as h2, and the ridge width of the flow channel 400 corresponding to the electrode plate 300 and the intermediate plate is denoted as W2, and h2≥1.2h1, W1≥1.4W2. It can be seen that by stamping and forming in two steps, the single-step forming height is reduced, the single-step forming thinning rate is reduced, and after two-step forming decomposition, the required forming characteristics are finally achieved, thereby reducing dark cracks and deformation.

[0078] It should be noted that the ridge of the flow channel 400 refers to the relatively flat part of the convex surface of the flow channel 400. After the first-step stamping, the center distance between the flow channels 400 of the formed intermediate plate member 200 is denoted as L1, the arc radius at one end of the convex surface of the flow channel 400 is denoted as R1, and the thinning rate of the intermediate plate member 200 relative to the base material 100 is denoted as δ1. After the second-step stamping, the center distance between the flow channels 400 of the formed electrode plate 300 is denoted as L2, the arc radius at one end of the convex surface of the flow channel 400 is denoted as R2, the thinning rate of the electrode plate 300 relative to the intermediate plate member 200 is denoted as δ2, and the thinning rate of the electrode plate 300 relative to the base material 100 is denoted as δ3. Among them, δ3 = δ1 * δ2, L1 = L2, R1≥R2.

[0079] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0080] The above-described embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An apparatus for optimizing the recessive hidden cracks in the stamping forming characteristics of the electrode plate, characterized in that, Comprising: a carrier assembly (30); a first template (10), located above the carrier assembly (30), and a plurality of stamping protrusions (11) and stamping recesses (12) are alternately arranged on the surface thereof facing the carrier assembly (30); a fitting assembly (20), located between the carrier assembly (30) and the first template (10); wherein, the fitting assembly (20) includes an elastic member (28), a plurality of first punches (21) and a plurality of second punches (22), the first punches (21) are arranged at intervals along a first direction (X), and an embedding gap (23) is formed on at least one side of each first punch (21) along the first direction (X), and each second punch (22) is embedded in the corresponding embedding gap (23); a fitting protrusion (211) for cooperating with the stamping recess (12) is provided at one end of each first punch (21), a fitting recess (221) for cooperating with the stamping protrusion (11) is provided at one end of each second punch (22), and the elastic member (28) is supported between the carrier assembly (30) and each first punch (21) or each second punch (22) so that one of the first punch (21) and the second punch (22) is in stamping cooperation with the first template (10) prior to the other.

2. The device for optimizing the recessive hidden crack of the stamping forming characteristics of the electrode plate according to claim 1, wherein, The fitting assembly (20) further includes an inner mold (26) and an outer mold (27) sleeved outside the inner mold (26), the inner mold (26) and the outer mold (27) are both arranged on the carrier assembly (30), the first punches (21) are arranged at intervals along the first direction (X) on the surface of the inner mold (26) facing the first template (10), both ends of each second punch (22) along a second direction (Y) intersecting with the first direction (X) are connected to the outer mold (27), and the elastic member (28) is supported between the outer mold (27) and the carrier assembly (30).

3. The device for optimizing the recessive hidden crack of the stamping forming characteristics of the pole plate according to claim 2, wherein The elastic member (28) is configured to drive the fitting recess (221) to extend beyond the fitting protrusion (211) along the third direction (Z) when the first template (10) and the fitting assembly (20) are in a separated state in the third direction (Z), wherein the first direction (X), the second direction (Y) and the third direction (Z) intersect pairwise and the three are not coplanar; and / or, The fitting assembly (20) further includes a first backing plate (29), the first backing plate (29) is arranged on the carrier assembly (30), the inner mold (26) and the outer mold (27) are both arranged on the first backing plate (29), a through hole (291) is provided on the first backing plate (29), and the elastic member (28) passes through the through hole (291) and abuts between the outer mold (27) and the carrier assembly (30).

4. The device for optimizing the recessive hidden cracks of the stamping forming characteristics of the pole plate according to claim 2, characterized in that, The outer mold (27) includes a first part (271) and a second part (272) connected to each other. The first part (271) and the second part (272) are located on opposite sides of the inner mold (26) along the first direction (X). The first part (271) and / or the second part (272) are supported on the bearing assembly (30) by the elastic member (28).

5. The device for optimizing the recessive hidden crack of the stamping forming characteristics of the pole plate according to claim 4, wherein Mounting holes (273) are provided on the surfaces of the first part (271) and / or the second part (272) facing the bearing assembly (30), and one end of the elastic member (28) is inserted into the mounting holes (273).

6. The device for optimizing the recessive hidden cracks of the stamping forming characteristics of the pole plate according to any one of claims 1-5, characterized in that, Both ends of each stamping convex part (11) along the first direction (X) include arc concave walls (111), and both ends of each mating convex part (211) along the first direction (X) include arc convex walls (21a), and the arc convex walls (21a) are arranged corresponding to the arc concave walls (111).

7. The device for optimizing the recessive hidden cracks of the stamping forming characteristics of the pole plate according to any one of claims 1-5, characterized in that, One of the first punches (21) is a first allowance punch (24), and the size of the mating concave part (221) of the first allowance punch (24) along the first direction (X) is larger than the sizes of the other mating concave parts (221). One of the second punches (22) is a second allowance punch (25), and the size of the mating convex part (211) of the second allowance punch (25) along the first direction (X) is larger than the sizes of the other mating convex parts (211). At least one first punch (21) and at least one second punch (22) are distributed between the first allowance punch (24) and the second allowance punch (25).

8. The device for optimizing the recessive hidden cracks of the stamping forming characteristics of the electrode plate according to any one of claims 1-5, characterized in that It further includes a second template (40) and a guiding member (41). The second template (40) is sleeved outside the mating assembly (20) and is arranged on the bearing assembly (30). The guiding member (41) is arranged between the first template (10) and the second template (40) for guiding the movement between the first template (10) and the second template (40).

9. A method for optimizing the recessive hidden cracks in the stamping forming characteristics of the electrode plate, using the device for optimizing the recessive hidden cracks in the stamping forming characteristics of the electrode plate according to any one of claims 1-8, characterized in that, The method includes the following steps: Place a base material (100) on the surface of the mating assembly (20) facing the first template (10); Drive the first template (10) to move towards the mating assembly (20) so that the stamping convex part (11) cooperates with the mating concave part (221), or the stamping concave part (12) cooperates with the mating convex part (211), and stamp the base material (100) to form an intermediate plate (200); Drive the first template (10) to continue moving so that the stamping convex part (11) cooperates with the mating concave part (221) and the stamping concave part (12) cooperates with the mating convex part (211), and stamp the intermediate plate (200) to form a pole plate (300); After maintaining the pressure for a preset time, separate the first template (10) from the mating assembly (20).

10. The method for optimizing the recessive hidden crack of the forming characteristics of the pole plate by stamping according to claim 9, wherein, In the step of driving the first template (10) to move towards the mating component (20), the stamping protrusion (11) and the mating recess (221) cooperate to stamp the substrate (100) to form the intermediate plate member (200). Among them, the height of the flow channel (400) of the intermediate plate member (200) is denoted as h1, the ridge width of the flow channel (400) of the intermediate plate member (200) is denoted as W1, the height of the flow channel (400) of the electrode plate (300) is denoted as h2, and the ridge width of the flow channel (400) on the electrode plate (300) corresponding to the intermediate plate is denoted as W2. h2 ≥ 1.2h1, W1 ≥ 1.4W2.

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