A punch and protrusion die for punching and protruding a steel strip of multiple specifications

Abstract

The utility model relates to the technical field of steel band manufacturing of battery core bundling, specifically relates to a kind of steel band punching and bulging moulding die of matching multiple specifications, it includes upper die holder and lower die holder;Its characterized in that: upper die holder bottom is equipped with upper clamping plate, and upper clamping plate is inlayed with mould core insert piece;Mould core insert piece is equipped with punch for cutting off steel band, several bulging punch pins for stamping out bulging structure on the surface of steel band and two positioning punch pins for punching out welding positioning hole on the surface of steel band;Upper clamping plate bottom is equipped with stop plate, and stop plate bottom is equipped with stripping plate, and stop plate and stripping plate are inlayed with mould core insert piece in both;Lower die holder top is equipped with concave die plate, and concave die plate is inlayed with mould core insert piece.The utility model solves the technical problems that existing steel band punching die cannot adjust bulging position and quantity quickly by modular insert piece, and bulging height is attenuated due to punch pin stress recession.

Description

Technical Field

[0001] This utility model relates to the field of battery cell bundling steel strip manufacturing technology, and more specifically, it relates to a punching and protruding die for steel strips of multiple specifications. Background Technology

[0002] Battery pack cell bundling steel straps (SUS304 material, see reference) Figure 1 In applications of resistance welding, the raised bulge structure (i.e., the protrusions on the steel strip) is a key element in ensuring the quality of the resistance welding process. These protrusions are responsible for providing reliable connection points during welding, directly affecting the stability of the weld strength. Mainstream battery pack manufacturers widely use this type of steel strip, which comes in various specifications (such as 1.0 * 19mm, 1.5 * 25mm, etc.), and multiple steel strips are required to fix a single cell assembly.

[0003] The forming process of steel strip for bundling battery cells is as follows: coil leveling → die blanking → bending and forming → pre-sleeving → resistance welding → heat shrink tubing shrinking → heat shrink tubing trimming → insulation withstand voltage test → labeling → packaging → shipping. However, while the existing die blanking process can produce steel strips, it has inherent defects in handling convex structures, such as the inability to flexibly adjust the position and number of convex points, which limits the company's ability to respond quickly to different specifications of products. In addition, the punches are subjected to uneven force during long-term punching of steel strip materials, and will gradually retract upwards, resulting in a decrease in the height of the convex points. This not only results in insufficient welding contact area but also causes a decrease in welding strength, failing to meet customer requirements. Utility Model Content

[0004] The purpose of this invention is to provide a multi-specification steel strip punching and embossing die to solve the technical problems of existing steel strip punching dies being unable to quickly adjust the position and number of embossings through modular inserts, and the embossing height decreasing due to the force-induced retraction of the punch.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A punching and embossing die for steel strips of various specifications includes an upper die base and a lower die base. The upper die base has an upper clamping plate at its bottom, and a die core insert is embedded in the upper clamping plate. The die core insert contains a punch for cutting the steel strip, several embossing punches for stamping embossed structures on the surface of the steel strip, and two positioning punches for punching welding positioning holes on the surface of the steel strip. The upper clamping plate has a stop plate at its bottom, and a stripper plate is located at its bottom. Both the stop plate and the stripper plate contain die core inserts. The lower die base has a concave template at its top, and a die core insert is embedded in the concave template.

[0007] Preferably, the concave template is inlaid with two sets of baffle assemblies, which are located at one end and the other end of the mold core insert, respectively; the baffle assembly includes at least two floating material blocks, which are located on one side and the other side of the steel strip, respectively; the side of the floating material block closest to the steel strip is provided with a floating material step for supporting the steel strip.

[0008] Preferably, a clamping plate is provided between the upper clamping plate and the upper mold base to prevent the punch from retracting towards the upper mold base; the clamping plate is made of Cr12Mov and has a hardness of HRC58-62.

[0009] Preferably, the convex punch is fixed in the slot of the mold core insert of the upper clamping plate by a hanging platform structure, and its top abuts against the clamping plate pad.

[0010] Preferably, the mold core insert includes a first insert and a second insert; both the first insert and the second insert are embedded in the corresponding upper clamping plate, stop plate, stripper plate and concave template through an inlay structure; the first insert has a plurality of first holes for fitting the corresponding convex punch, a second hole for fitting one of the positioning punches, and a third hole for fitting the punch; the second insert has a fourth hole for fitting another positioning punch.

[0011] Preferably, the mold core insert is made of SKH-9 high-speed steel.

[0012] In summary, this utility model has the following beneficial effects: the interchangeable mold core insert design enables flexible adjustment of the position and number of steel strip protrusions, significantly improving the versatility and adaptability of the mold; the use of Cr12Mov reinforced clamping plates and SKH-9 high-speed steel split mold core inserts effectively solves the problem of protrusion height reduction caused by protrusion punch retraction, ensuring the stability of welding strength; the modular design simplifies the rework process of the mold core inserts, greatly improving maintenance efficiency; at the same time, by optimizing the template material and structural design, the overall strength and wear resistance of the mold are enhanced, the service life is extended, and operational safety is improved, comprehensively optimizing production efficiency and product quality. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the steel strip used to bundle the battery cells.

[0014] Figure 2 This is the front view of this utility model.

[0015] Figure 3 This is an assembly drawing of the concave template and the mold core insert in this utility model.

[0016] Figure 4 yes Figure 3 Top view.

[0017] Figure 5This is a partial structural schematic diagram of the present invention.

[0018] In the diagram: 1. Upper mold base; 2. Lower mold base; 3. Upper clamping plate; 4. Mold core insert; 41. First insert; 411. First socket; 412. Second socket; 413. Third socket; 42. Second insert; 421. Fourth socket; 5. Punch; 6. Convex punch; 7. Positioning punch; 8. Stop plate; 9. Stripper plate; 10. Die plate; 101. Floating material stop block; 1011. Rounded corner; 1012. Floating material step; 102. Locking screw; 11. Clamping plate pad. Detailed Implementation

[0019] To make the objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] This utility model provides a punching and embossing die for steel strips of various specifications, such as... Figure 2-5 As shown, it includes an upper mold base 1 and a lower mold base 2; the upper mold base 1 is provided with an upper clamping plate 3 at the bottom, and a mold core insert 4 is embedded in the upper clamping plate 3; the mold core insert 4 is provided with a punch 5 for cutting steel strip, several punches 6 for punching protrusions on the surface of steel strip, and two positioning punches 7 for punching welding positioning holes on the surface of steel strip; the upper clamping plate 3 is provided with a stop plate 8 at the bottom, and a stripper plate 9 at the bottom of the stop plate 8, and both the stop plate 8 and the stripper plate 9 are provided with mold core inserts 4; the lower mold base 2 is provided with a concave template 10 at the top, and the mold core insert 4 is embedded in the concave template 10.

[0022] Furthermore, the concave template 10 is inlaid with two sets of baffle assemblies, which are located at one end and the other end of the mold core insert 4, respectively. The baffle assembly includes at least two floating material blocks 101, which are located on one side and the other side of the steel strip, respectively. The floating material block 101 is provided with a floating material step 1012 for supporting the steel strip on the side near the steel strip.

[0023] Furthermore, a clamping plate 11 is provided between the upper clamping plate 3 and the upper mold base 1 to prevent the protruding punch 6 from retracting towards the upper mold base 1; the clamping plate 11 is made of Cr12Mov and has a hardness of HRC58-62.

[0024] Furthermore, the convex punch 6 is fixed in the slot of the mold core insert 4 of the upper clamping plate 3 by the hanging platform structure, and its top abuts against the clamping plate pad 11.

[0025] Furthermore, the mold core insert 4 includes a first insert 41 and a second insert 42; the first insert 41 and the second insert 42 are both embedded in the corresponding upper clamping plate 3, stop plate 8, stripper plate 9 and concave template 10 through an inlay structure; the first insert 41 has a plurality of first sleeve holes 411 for fitting the corresponding convex punch 6, a second sleeve hole 412 for fitting one of the positioning punches 7, and a third sleeve hole 413 for fitting the punch 5; the second insert 42 has a fourth sleeve hole 421 for fitting another positioning punch 7.

[0026] Furthermore, the mold core insert 4 is made of SKH-9 high-speed steel.

[0027] Specifically, the clamping plate 11 is fixed to the lower surface of the upper die base 1 with screws, and the upper clamping plate 3 is fixed to the lower surface of the clamping plate 11 with screws. The stripper plate 9 is elastically connected to the upper clamping plate 3 through a conventional method of equal-height sleeve screw assembly (i.e., screw + sleeve + compression spring); that is, the screw shank passes through the stripper plate 9 and is screwed into the threaded hole of the upper clamping plate 3, but an equal-height sleeve is fitted on the screw shank. The length of the sleeve determines the initial position of the stripper plate 9 when it is not under force (i.e., the maximum opening distance between it and the clamping plate); a strong compression spring is installed between the sleeve and the upper clamping plate 3. The elastic force of the compression spring is transmitted through the sleeve, always pushing the stripper plate 9 downward, so that it presses down on the steel strip before stamping. During stamping, the upper die moves downward, the stripper plate 9 presses down on the material first, then the compression spring is compressed, and the upper clamping plate 3 continues to move downward, completing the punching, embossing, and other actions. During the return stroke, the spring force pushes the stripper plate 9 to remove the steel strip from the punch 5 and assists in material ejection. The stop plate 8 is fixedly installed on the lower surface of the upper clamping plate 3 or on the upper surface of the stripper plate 9 by screws; the concave template 10 is fixed to the upper surface of the lower die base 2 by screws; a mold core insert 4 is embedded inside the upper clamping plate 3, the stop plate 8, the stripper plate 9 and the concave template 10; the mold core insert 4 consists of two parts, a first insert 41 and a second insert 42, which are each embedded in the corresponding insert groove through an inlay structure.

[0028] The upper ends of the punch 5, six protruding punches 6, and one positioning punch 7 are all fixedly mounted on the first insert 41 located inside the upper clamping plate 3 by a conventional method of mounting structure (a structure with a T-shaped top). The lower ends of each punch pass through the corresponding third set hole 413, first set hole 411, and second set hole 412 on the first insert 41 located at different positions in sequence. The other positioning punch 7 is mounted on the second insert 42 located inside the upper clamping plate 3 by the mounting structure. Its lower end passes through the corresponding fourth set hole 421 on the second insert 42 located at different positions in sequence.

[0029] Eight floating material stops 101 Figure 3The floating material stop 101 is installed on the concave template 10 at the position shown. A compression spring (not shown in the attached diagram) is installed on the bottom plate of the floating material stop 101, allowing the floating material stop 101 to slide vertically on the concave template 10. A crescent-shaped floating material step 1012 is provided at the lower end of the floating material stop 101. When the upper mold base 1 descends, the floating material step 1012 is pressed down by the steel strip and slides downwards until its top surface is flush with the top surface of the concave template 10. The upper edge of the floating material stop 101 has a rounded corner 1011 to facilitate the steel strip entering between the two floating material stops 101. The distance between the sides of the two floating material steps 1012 (… Figure 4 The distance shown at point D corresponds to the width of the steel strip. When changing to products of different widths, the corresponding floating material stop 101 needs to be replaced. To prevent the first insert 41 from loosening on the concave template 10, it is locked onto the concave template 10 by locking screws 102.

[0030] When the die cutting edge is worn, the first insert 41 can be removed directly from the concave template 10 by loosening the locking screw 102 and using a push rod from the scrap position of the lower die base 2. Alternatively, a magnet with strong magnetic force can be used to remove the first insert 41 from the concave template 10. Under the existing die structure, the rework of the punching cutting edge requires removing the entire lower die part of the die set from the punching machine, loosening the fixing bolts between the template and the die base, and placing the punching template on a large surface grinder. Because the grinding area is large, not only does the punching cutting edge area need to be finely ground, but the flatness of the entire template must also be ensured. This results in a long time to grind the worn parts of the cutting edge. Compared with the existing structure, the first insert 41 is small in size and does not need to be reworked with a large surface grinder. A conventional hand-cranked small grinder can be used for rework, reducing the original 15 minutes of large surface grinder rework time to less than 5 minutes. The concave template 10 can also be directly pressed in on the punching machine, and the locking screw 102 can be tightened to continue working.

[0031] In the original mold structure, the upper clamping plate 3 that holds the punch 6 directly contacts the upper mold base 1. The upper mold base 1 is typically made of 45# steel, with a hardness value between HRC20 and 30. This means that the reaction force of the punch 6 punching through the steel strip acts directly on the upper mold base 1. Even if the 45# steel is heat-treated, its high carbon content increases its brittleness, making it unsuitable for molds with high production stamping requirements. This application adds a 15mm thick Cr12Mov steel clamping pad 11 between the upper clamping plate 3 and the upper mold base 1. After heat treatment and tempering, the hardness value can reach HRC58-62. This effectively blocks the reaction force of the punch 6 punching on the steel strip, ensuring that the punch 6 and the positioning punch 7 do not experience a decrease in punch height or failure to punch through the welding positioning hole due to prolonged punching time.

[0032] The die insert 4, located within the die plate 10, is the main load-bearing component. It can be made of SKH-9 high-speed steel, exhibiting excellent wear resistance during cold stamping of stainless steel strips and maintaining its original physical properties even after overheating during stamping. Even in the event of wear or cracking, the die insert 4 will be damaged first, and the repair and replacement cost of the die insert 4 is far lower than that of the entire die plate 10. Even if the die insert 4 accidentally cracks, the entire die plate 10 will contain it, preventing it from flying directly out of the stamping area and endangering the operator's life.

[0033] In summary, this utility model achieves flexible adjustment of the position and number of steel strip protrusions through the interchangeable mold core insert design, significantly improving the versatility and adaptability of the mold. The use of Cr12Mov reinforced clamping plates and SKH-9 high-speed steel split mold core inserts effectively solves the problem of protrusion height reduction caused by punch retraction, ensuring the stability of welding strength. The modular design simplifies the repair process of the mold core inserts, greatly improving maintenance efficiency. Simultaneously, by optimizing the template material and structural design, the overall strength and wear resistance of the mold are enhanced, extending its service life and improving operational safety, comprehensively optimizing production efficiency and product quality.

[0034] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A punching and embossing die for steel strips of various specifications, comprising an upper die base and a lower die base; characterized in that: The upper mold base has an upper clamping plate at the bottom, and a mold core insert is embedded in the upper clamping plate; the mold core insert has a punch for cutting the steel strip, several punches for punching convex structures on the surface of the steel strip, and two positioning punches for punching welding positioning holes on the surface of the steel strip; the upper clamping plate has a stop plate at the bottom, and a stripper plate at the bottom of the stop plate, and both the stop plate and the stripper plate have mold core inserts embedded in them; the lower mold base has a concave template at the top, and a mold core insert is embedded in the concave template.

2. The steel strip punching and protrusion die according to claim 1, characterized in that: Two sets of baffle assemblies are embedded in the concave template. The two sets of baffle assemblies are located at one end and the other end of the mold core insert, respectively. The baffle assembly includes at least two floating material blocks, which are located on one side and the other side of the steel strip, respectively. The side of the floating material block closest to the steel strip is provided with a floating material step for supporting the steel strip.

3. The steel strip punching and protrusion die according to claim 1, characterized in that: A clamping plate and a pad are provided between the upper clamping plate and the upper mold base to prevent the punch from retracting towards the upper mold base; the clamping plate and pad are made of Cr12Mov and have a hardness of HRC58-62.

4. The steel strip punching and protrusion die according to claim 3, characterized in that: The punch is fixed in the slot of the mold core insert on the upper clamping plate by the hanging platform structure, and its top abuts against the clamping plate pad.

5. The steel strip punching and protrusion die according to claim 4, characterized in that: The mold core insert includes a first insert and a second insert; both the first insert and the second insert are inlaid in the corresponding upper clamping plate, stop plate, stripper plate and concave template through an inlay structure; the first insert has a number of first holes for fitting the corresponding convex punch, a second hole for fitting one of the positioning punches, and a third hole for fitting the punch; the second insert has a fourth hole for fitting another positioning punch.

6. The steel strip punching and protrusion die according to claim 5, characterized in that: The mold core insert is made of SKH-9 high-speed steel.

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