Punching device

Abstract

The utility model belongs to the technical field of battery manufacturing, and particularly discloses a punching device which comprises a workbench, an upper die assembly, a lower die assembly and a driving piece. The upper die assembly is arranged on a mounting frame of the workbench in a sliding mode, the lower die assembly is arranged on the workbench, and the driving piece can drive the upper die assembly to move in the direction close to the lower die assembly. Through cooperation of the upper die assembly and the lower die assembly, an annular tangent plane can be formed on a workpiece to be machined in a punching mode. Therefore, the nozzle waste on the to-be-machined workpiece is automatically cut off, and the remaining part after the nozzle waste is cut off is a finished product. Through the punching device, the water gap waste can be rapidly cut off, the machining efficiency is high, meanwhile, the water gap waste is completely cut off, the defects of burrs, flashes and the like are avoided, and the appearance quality of a finished product is good.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a punching device. Background Art

[0002] In order to insulate the battery cell from the battery cover, an annular insulating gasket is placed between the battery cell and the battery cover. Generally speaking, the annular insulating gasket can be manufactured by injection molding.

[0003] At present, in some existing injection molding schemes of annular insulating gaskets, a round cake-shaped sheet structure can be first made using a mold, and then a through hole is manually formed at the center of the sheet structure through the mold, thereby processing the round cake-shaped sheet structure into a circular annular insulating gasket.

[0004] However, the manual cutting method is time-consuming and has low production capacity. In addition, during the punching process, burrs are easily formed on the inner side of the annular insulating gasket due to incomplete removal of the nozzle waste, resulting in poor appearance quality of the finished product. Utility Model Content

[0005] The purpose of the utility model is to provide a punching device that can realize the automatic cutting of nozzle waste with high processing efficiency. At the same time, the nozzle waste can also be cut cleanly to avoid defects such as burrs and flash, and the appearance quality of the finished product is better.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] The utility model provides a punching device, which includes:

[0008] A workbench, wherein a mounting frame is provided on the workbench;

[0009] An upper mold assembly is slidably mounted on the mounting frame, the upper mold assembly comprising a first base, a second base, and a punching knife, the second base being elastically connected to the first base, a guide cylinder being provided on the second base, one end of the punching knife being connected to the first base, the other end of the punching knife having an annular blade, and the end of the punching knife having the annular blade being slidably mounted in the guide cylinder;

[0010] A lower die assembly is arranged on the workbench, the lower die assembly includes a third base, a positioning cylinder is provided on the third base, and an annular mounting position for placing a workpiece to be processed is provided on the positioning cylinder, and a projection of the positioning cylinder on the workbench along the height direction of the third base and a projection of the guide cylinder on the workbench at least partially overlap, and an annular section can be formed on the workpiece to be processed when one end of the punching knife provided with the annular blade extends out of the guide cylinder and enters the interior of the positioning cylinder;

[0011] The driving member is arranged on the mounting frame, and the output end of the driving member is connected to the upper mold assembly. The driving member is used to drive the upper mold assembly to move toward or away from the lower mold assembly.

[0012] Optionally, along the radial direction of the positioning cylinder, the single-sided interference between the annular section and the annular blade is 0.025 mm-0.050 mm.

[0013] Optionally, one end of the punching knife provided with the annular blade is further provided with an avoidance groove with a circular cross-section, and the avoidance groove is arranged concentrically with the annular blade.

[0014] Optionally, the annular mounting position includes a first annular support surface, a second annular support surface and a transition surface, two ends of the transition surface are respectively connected to the first annular support surface and the second annular support surface, and there is a height difference between the first annular support surface and the second annular support surface.

[0015] Optionally, an annular limiting portion is provided on one end of the guide cylinder facing the positioning cylinder, and the annular limiting portion abuts against a side of the workpiece to be processed that is away from the positioning cylinder.

[0016] Optionally, a guide column is provided on the first base, and a guide hole is provided on the third base. The guide column is arranged through the second base. When the upper mold assembly moves toward the direction close to the lower mold assembly, the guide column can be inserted into the guide hole and slide in contact with the inner wall of the guide hole.

[0017] Optionally, there are multiple guide cylinders, punching knives and positioning cylinders, multiple punching knives are arranged at intervals on the first base, multiple guide cylinders are arranged at intervals on the second base, and multiple positioning cylinders are arranged at intervals on the third base, and the guide cylinders, punching knives and positioning cylinders correspond to each other one by one.

[0018] Optionally, the upper mold assembly includes a connecting bolt and an elastic member, the connecting bolt passes through the second base and is threadedly connected to the first base, the elastic member is sleeved on the punching knife, and one end of the elastic member abuts against the first base, and the other end of the elastic member abuts against the second base or the guide cylinder.

[0019] Optionally, the second base includes a first plate and a second plate, the first plate is provided with an avoidance hole, the second plate is provided with a mounting hole, the guide cylinder is arranged in the mounting hole, and the end of the guide cylinder close to the first base is provided with an annular limiting groove, one end of the elastic member abuts against the first base, and the other end of the elastic member passes through the avoidance hole and abuts against the bottom wall of the annular limiting groove.

[0020] Optionally, the mounting frame includes a support column, a fixed plate and a movable mounting plate, the two ends of the support column are respectively connected to the fixed plate and the workbench, the driving member is arranged on the fixed plate, the output end of the driving member passes through the fixed plate and is connected to the side of the movable mounting plate away from the workbench, the upper mold assembly is arranged on the side of the movable mounting plate close to the workbench, and a sliding sleeve is provided on the movable mounting plate, and the sliding sleeve can slide back and forth along the support column.

[0021] The beneficial effects of the utility model are:

[0022] The utility model provides a punching device, including a workbench, an upper mold assembly, a lower mold assembly and a driving member. The upper mold assembly is slidably arranged on the mounting frame of the workbench, and the lower mold assembly is arranged on the workbench. The upper mold assembly includes a first base, a second base and a punching knife, the second base is elastically connected to the first base, a guide cylinder is provided on the second base, one end of the punching knife is connected to the first base, and the other end of the punching knife has an annular blade, and the end of the punching knife provided with the annular blade is slidably arranged in the guide cylinder. The lower mold assembly includes a third base, a positioning cylinder is provided on the third base, and an annular mounting position is provided on the positioning cylinder, and the workpiece to be processed is placed on the annular mounting position. The driving member is fixed on the mounting frame, and the output end of the driving member is connected to the upper mold assembly. The upper mold assembly can be driven by the driving member to move in a direction close to or away from the lower mold assembly.

[0023] The upper mold assembly is driven toward the lower mold assembly by a driver. The bottom end of the guide cylinder contacts the workpiece mounted on the annular mounting position. The end of the punching cutter, equipped with an annular blade, then extends out of the guide cylinder and enters the interior of the positioning cylinder. The punching cutter then forms an annular section on the workpiece. The position of the annular section corresponds to the point where the workpiece on the annular mounting position engages the punching cutter. This automatically removes the waste material from the nozzle of the workpiece, and the remaining portion after removal is the finished product. This punching device allows for rapid removal of nozzle waste, resulting in high processing efficiency. The nozzle waste is cleanly removed, avoiding defects such as burrs and flash, resulting in a high-quality finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the punching device provided in an embodiment of the present utility model;

[0025] Figure 2 It is a structural schematic diagram of the upper mold assembly and the lower mold assembly provided in an embodiment of the present utility model;

[0026] Figure 3 It is a cross-sectional view of the upper mold assembly and the lower mold assembly provided in an embodiment of the present utility model;

[0027] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle;

[0028] Figure 5 It is a cross-sectional view of the guide cylinder, punching knife and positioning cylinder provided in the embodiment of the present utility model;

[0029] Figure 6 yes Figure 5 A partial enlarged view of point B in the middle.

[0030] In the picture:

[0031] 10. Workpiece to be processed; 11. Annular section; 12. Finished product; 13. Waste material from nozzle;

[0032] 100, workbench; 110, mounting frame; 111, support column; 112, fixed plate; 113, movable mounting plate; 114, sliding sleeve;

[0033] 200, upper die assembly; 210, first base; 220, second base; 221, first plate; 2211, avoidance hole; 222, second plate; 2221, mounting hole; 2222, limiting step; 2223, sink; 230, punching knife; 231, annular blade; 232, avoidance groove; 240, guide cylinder; 241, annular limiting portion; 242, annular limiting groove; 250, guide column; 260, connecting bolt; 270, elastic member;

[0034] 300, lower mold assembly; 310, third base; 311, guide hole; 320, positioning cylinder; 321, annular mounting position; 3211, first annular support surface; 3212, second annular support surface; 3213, transition surface; 330, translation mechanism; 331, mobile platform; 332, slider; 333, slide rail;

[0035] 400. Driving parts. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0037] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0040] like Figure 1-Figure 4 As shown, this embodiment provides a punching device, which includes a workbench 100, an upper die assembly 200, a lower die assembly 300 and a driving member 400.

[0041] Among them, a mounting frame 110 is provided on the workbench 100. The upper mold assembly 200 is slidably set on the mounting frame 110, and the lower mold assembly 300 is set on the workbench 100. The upper mold assembly 200 includes a first base 210, a second base 220 and a punching knife 230. The second base 220 is elastically connected to the first base 210. A guide cylinder 240 is provided on the second base 220. One end of the punching knife 230 is connected to the first base 210, and the other end of the punching knife 230 has an annular blade 231. The end of the punching knife 230 with the annular blade 231 is slidably set in the guide cylinder 240. The lower mold assembly 300 includes a third base 310. A positioning cylinder 320 is provided on the third base 310. The positioning cylinder 320 is provided with an annular mounting position 321. The workpiece 10 to be processed is placed on the annular mounting position 321, and along the height direction of the third base 310 ( Figure 2 The projection of positioning cylinder 320 on workbench 100 (in the Z-axis direction shown in FIG) at least partially overlaps with the projection of guide cylinder 240 on workbench 100, and the projection of positioning cylinder 320 on workbench 100 is concentric with the projection of guide cylinder 240 on workbench 100. A driving member 400 is fixed to mounting bracket 110, and an output end of driving member 400 is connected to upper mold assembly 200. Driving member 400 can drive upper mold assembly 200 toward or away from lower mold assembly 300.

[0042] When the driving member 400 drives the upper mold assembly 200 toward the lower mold assembly 300, the distance between the second base 220 and the third base 310 gradually decreases until the bottom end of the guide cylinder 240 abuts against the workpiece 10 set on the annular mounting position 321. Then, the driving member 400 drives the upper mold assembly 200 to continue to approach the lower mold assembly 300. The relative positions of the second base 220 and the third base 310 remain unchanged. The first base 210 continues to approach the third base 310. The end of the punching knife 230 with the annular blade 231 will extend out of the guide cylinder 240 and enter the interior of the positioning cylinder 320. At this time, the punching knife 230 can punch out an annular section 11 on the workpiece 10. The position of the annular section 11 is the position where the workpiece 10 on the annular mounting position 321 engages with the punching knife 230. This achieves the automatic removal of the nozzle waste 13 on the workpiece 10. The remaining portion after the nozzle waste 13 is removed is the finished product 12. By adopting the punching device in this embodiment, the nozzle waste 13 can be quickly cut off with high processing efficiency. At the same time, the nozzle waste 13 is cleanly cut off to avoid defects such as burrs and flash, and the appearance quality of the finished product 12 is better.

[0043] Alternatively, the workpiece 10 in this embodiment may be a semi-finished material of an annular insulating gasket, which is a sheet-like structure approximately in the shape of a round cake formed by injection molding. The driving member 400 is a pressurized cylinder.

[0044] See also Figure 5 and Figure 6 , along the radial direction of the positioning cylinder 320 (ie Figure 5 In the X-axis direction in FIG, the unilateral interference between the annular section 11 of the workpiece 10 to be processed and the annular blade 231 is 0.025 mm to 0.050 mm. By way of example, in this embodiment, the unilateral interference between the annular section 11 and the annular blade 231 can be 0.025 mm, 0.030 mm, 0.035 mm, 0.040 mm, 0.045 mm, or 0.050 mm, etc. By setting a smaller unilateral interference between the annular section 11 and the annular blade 231, it is ensured that no burrs or burrs are formed when the nozzle waste 13 on the workpiece 10 to be processed is removed, and the outer surface of the finished product 12 is smooth and has a good appearance quality. Of course, the unilateral interference between the annular section 11 and the annular blade 231 should not be too large, otherwise it will affect the size and final shape of the finished product 12, and the quality of the finished product 12 will be poor; the unilateral interference between the annular section 11 and the annular blade 231 should not be too small, otherwise it will be impossible to avoid the generation of burrs and burrs when cutting off the sprue waste 13.

[0045] Furthermore, one end of the punching knife 230 having the annular blade 231 is also provided with an avoidance groove 232 having a circular cross-section, and the avoidance groove 232 is arranged concentrically with the annular blade 231. In this embodiment, by providing the avoidance groove 232, an avoidance space can be provided for the sprue waste 13, thereby preventing the center position of the punching knife 230 from colliding with the sprue waste 13 of the workpiece 10 before the annular blade 231 of the punching knife 230 contacts the workpiece 10, thereby preventing poor punching and defects on the outer surface of the finished product 12. After providing the avoidance groove 232, this problem can be well solved, ensuring that the annular section 11 contacts the annular blade 231 first, and the surface of the annular section 11 after punching is smooth and flat.

[0046] Continue to see Figure 5The annular mounting position 321 includes a first annular support surface 3211, a second annular support surface 3212, and a transition surface 3213. The transition surface 3213 connects the first annular support surface 3211 and the second annular support surface 3212 at both ends, and there is a height difference between the first annular support surface 3211 and the second annular support surface 3212. The shapes of the first annular support surface 3211, the second annular support surface 3212, and the transition surface 3213 match the outer shape of the finished product 12 to be processed. The provision of the first annular support surface 3211 and the second annular support surface 3212 provides good support for the workpiece 10 to be processed when the guide cylinder 240 contacts the positioning cylinder 320, thereby allowing the punching blade 230 to form an annular cut surface 11 on the workpiece 10 to remove the nozzle waste 13. It should be noted that there is a transition fit between the first annular support surface 3211 and the inner ring of the finished product 12, that is, the inner diameter of the first annular support surface 3211 is slightly smaller than the inner diameter of the finished product 12 of the workpiece 10 to be processed, so as to avoid the annular blade 231 of the punching knife 230 damaging the finished product 12 and ensure that the size of the finished product 12 meets the requirements.

[0047] Optionally, an annular stopper 241 is further provided at one end of the guide cylinder 240 facing the positioning cylinder 320. The annular stopper 241 abuts against the side of the workpiece 10 facing away from the positioning cylinder 320. For example, the annular stopper 241 may be an annular protrusion that mates with the side of the workpiece 10 facing away from the positioning cylinder 320, thereby enabling the guide cylinder 240 and the positioning cylinder 320 to stably clamp the workpiece 10, allowing the punching blade 230 to punch out the annular section 11 in the workpiece 10.

[0048] Continue to see Figure 2 and Figure 3 In this embodiment, a guide post 250 is provided on the first base 210, and a guide hole 311 is provided on the third base 310. The guide post 250 is disposed through the second base 220. When the upper mold assembly 200 moves toward the lower mold assembly 300, the guide post 250 can be inserted into the guide hole 311 and slide against the inner wall of the guide hole 311. Thus, the cooperation between the guide post 250 and the guide hole 311 ensures that the movement trajectory of the first base 210 is accurate, thereby ensuring accurate positioning between the guide cylinder 240 and the positioning cylinder 320, and between the punching blade 230 and the positioning cylinder 320. This results in a high degree of consistency and good appearance quality in the finished product 12.

[0049] As an optional solution, in this embodiment, two guide posts 250 and two guide holes 311 are each provided. The two guide posts 250 are respectively arranged on either side of the guide cylinder 240 and are symmetrically arranged. The two guide holes 311 are respectively arranged on either side of the positioning cylinder 320 and are also symmetrically arranged, thereby further improving the accuracy of the movement trajectory of the first base 210. Of course, in other embodiments, the number of guide posts 250 and guide holes 311 can be set to a larger number, which is not limited here.

[0050] Furthermore, in this embodiment, the guide cylinder 240, the punching knife 230, and the positioning cylinder 320 are each provided in plurality. The plurality of punching knives 230 are arranged at intervals on the first base 210, the plurality of guide cylinders 240 are arranged at intervals on the second base 220, and the plurality of positioning cylinders 320 are arranged at intervals on the third base 310. The guide cylinders 240, the punching knives 230, and the positioning cylinders 320 correspond to each other one by one. By providing a plurality of the guide cylinders 240, the punching knives 230, and the positioning cylinders 320, a plurality of workpieces 10 to be processed can be punched at the same time, greatly improving the processing efficiency. For example, in this embodiment, the guide cylinders 240, the punching knives 230, and the positioning cylinders 320 can each be provided in four, with two guide cylinders 240, two punching knives 230, and two positioning cylinders 320 forming a row, and the guide cylinders 240, the punching knives 230, and the positioning cylinders 320 forming two rows in total.

[0051] As an optional solution, the upper mold assembly 200 in this embodiment further includes a connecting bolt 260 and an elastic member 270. The connecting bolt 260 passes through the second base 220 and is threadedly connected to the first base 210. The elastic member 270 is sleeved on the punching blade 230, and one end of the elastic member 270 abuts against the first base 210, and the other end of the elastic member 270 abuts against the second base 220 or the guide cylinder 240. Through the arrangement of the connecting bolt 260 and the elastic member 270, before the second base 220 contacts the third base 310, the elastic member 270 can exert a force on the second base 220 in a direction away from the first base 210, and cooperate with the limiting effect of the connecting bolt 260 to maintain a preset distance between the second base 220 and the first base 210. When the driving member 400 drives the upper mold assembly 200 toward the lower mold assembly 300, the elastic member 270 can absorb part of the impact force to avoid rigid contact between the second base 220 and the third base 310, and between the guide cylinder 240 and the workpiece 10 on the positioning cylinder 320. For example, the elastic member 270 can be a spring.

[0052] See also Figure 3 and Figure 4In this embodiment, the second base 220 includes a first plate 221 and a second plate 222. The first plate 221 is provided with an avoidance hole 2211, and the second plate 222 is provided with a mounting hole 2221. The guide cylinder 240 is disposed within the mounting hole 2221. Specifically, the guide cylinder 240 has a raised portion at one end adjacent to the first plate 221. A limiting step 2222 is provided within the mounting hole 2221, and the raised portion abuts against the limiting step 2222. After the guide cylinder 240 is installed in the mounting hole 2221, the second plate 222 is fixed to the first plate 221, thereby fixing the position of the guide cylinder 240 on the second base 220. Optionally, the second plate 222 and the first plate 221 may be connected by bolts or welding. Furthermore, an annular retaining groove 242 is provided at the end of the guide cylinder 240 near the first base 210. One end of the elastic member 270 abuts the first base 210, while the other end of the elastic member 270 passes through the avoidance hole 2211 in the first plate 221 and abuts the bottom wall of the annular retaining groove 242. The provision of the annular retaining groove 242 stabilizes the position of the elastic member 270 on the second base 220, preventing the elastic member 270 from shifting, and effectively positioning the elastic member 270.

[0053] Optionally, a recessed groove 2223 is further provided on the side of the second base 220 facing the third base 310. The head of the connecting bolt 260 is embedded in the recessed groove 2223, and the tail of the connecting bolt 260 passes through the second base 220 and is threadedly connected to the first base 210. By embedding the head of the connecting bolt 260 in the recessed groove 2223, interference between the connecting bolt 260 and the third base 310 is avoided.

[0054] Continue to see Figure 1The mounting frame 110 in this embodiment includes a support column 111, a fixed plate 112 and a movable mounting plate 113. The two ends of the support column 111 are respectively connected to the fixed plate 112 and the workbench 100. The driving member 400 is arranged on the fixed plate 112. The output end of the driving member 400 passes through the fixed plate 112 and is connected to the side of the movable mounting plate 113 away from the workbench 100. The upper mold assembly 200 is arranged on the side of the movable mounting plate 113 close to the workbench 100. A sliding sleeve 114 is provided on the movable mounting plate 113, and the sliding sleeve 114 can slide back and forth along the support column 111. Therefore, when the output end of the driving member 400 drives the movable mounting plate 113 to move toward the lower mold assembly 300, the upper mold assembly 200 set on the movable mounting plate 113 will also move in the direction close to the lower mold assembly 300. The setting of the support column 111 and the sliding sleeve 114 can ensure that the moving trajectory of the movable mounting plate 113 is determined, thereby ensuring that the upper mold assembly 200 and the lower mold assembly 300 are accurately aligned, so that the guide cylinder 240 can press the workpiece 10 to be processed onto the annular mounting position 321 of the positioning cylinder 320, making it convenient for the punching knife 230 to perform punching operations on the workpiece 10 to be processed.

[0055] As a more preferred solution, the lower mold assembly 300 in this embodiment also includes a translation mechanism 330, which includes a movable platform 331, a slider 332, and a slide rail 333. The slide rail 333 is arranged on the workbench 100, and the slider 332 is arranged on the side of the movable platform 331 close to the workbench 100. The slider 332 is slidably connected to the slide rail 333. The third base 310 is arranged on the side of the movable platform 331 away from the workbench 100. Furthermore, the movable platform 331 can be manually driven by an operator, or can also be driven by a cylinder, a linear motor, etc. Therefore, after a batch of workpieces 10 to be processed are punched, the third base 310 can be removed from the bottom of the upper mold assembly 200 by moving the movable platform 331, making it convenient to replace a new batch of workpieces 10 to be processed. After a new batch of workpieces 10 to be processed are placed on the annular mounting position 321 of the positioning cylinder 320 , the movable platform 331 can be reset to be located below the upper mold assembly 200 so as to perform the punching operation again.

[0056] Optionally, in some embodiments, a waste collection trough (not shown in the figure) can be provided on the side of the mobile platform 331 close to the workbench 100, and the positioning cylinder 320 is connected to the waste collection trough. When the punching knife 230 cuts off the sprue waste 13 of the workpiece 10 to be processed, the sprue waste 13 can pass through the positioning cylinder 320 and fall into the waste collection trough, thereby facilitating the unified recycling and processing of the sprue waste 13.

[0057] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A punching device, characterized in that: include: A workbench (100), wherein a mounting frame (110) is provided on the workbench (100); An upper mold assembly (200) is slidably arranged on the mounting frame (110), the upper mold assembly (200) comprising a first base (210), a second base (220) and a punching knife (230), the second base (220) being elastically connected to the first base (210), a guide cylinder (240) being provided on the second base (220), one end of the punching knife (230) being connected to the first base (210), the other end of the punching knife (230) being provided with an annular blade (231), and the end of the punching knife (230) provided with the annular blade (231) being slidably arranged in the guide cylinder (240); A lower die assembly (300) is arranged on the workbench (100), and the lower die assembly (300) includes a third base (310). A positioning cylinder (320) is provided on the third base (310). The positioning cylinder (320) is provided with an annular mounting position (321) for placing a workpiece (10) to be processed. The projection of the positioning cylinder (320) on the workbench (100) along the height direction of the third base (310) at least partially overlaps with the projection of the guide cylinder (240) on the workbench (100). When one end of the punching knife (230) provided with the annular blade (231) extends out of the guide cylinder (240) and enters the interior of the positioning cylinder (320), an annular section (11) can be formed on the workpiece (10) to be processed. A driving member (400) is arranged on the mounting frame (110), an output end of the driving member (400) is connected to the upper mold assembly (200), and the driving member (400) is used to drive the upper mold assembly (200) to move toward or away from the lower mold assembly (300).

2. The punching device according to claim 1, characterized in that Along the radial direction of the positioning cylinder (320), the single-side interference between the annular section (11) and the annular blade (231) is 0.025 mm to 0.050 mm.

3. The punching device according to claim 1, characterized in that One end of the punching knife (230) provided with the annular blade (231) is also provided with an avoidance groove (232) with a circular cross section, and the avoidance groove (232) is arranged concentrically with the annular blade (231).

4. The punching device according to claim 1, characterized in that The annular mounting position (321) comprises a first annular supporting surface (3211), a second annular supporting surface (3212) and a transition surface (3213); the two ends of the transition surface (3213) are respectively connected to the first annular supporting surface (3211) and the second annular supporting surface (3212); and there is a height difference between the first annular supporting surface (3211) and the second annular supporting surface (3212).

5. The punching device according to claim 1, characterized in that An annular limiting portion (241) is provided at one end of the guide cylinder (240) facing the positioning cylinder (320), and the annular limiting portion (241) abuts against a side of the workpiece (10) to be processed that is away from the positioning cylinder (320).

6. The punching device according to claim 1, characterized in that A guide column (250) is provided on the first base (210), and a guide hole (311) is provided on the third base (310). The guide column (250) is arranged through the second base (220). When the upper mold assembly (200) moves toward the lower mold assembly (300), the guide column (250) can be inserted into the guide hole (311) and slide in contact with the inner wall of the guide hole (311).

7. The punching device according to claim 1, characterized in that There are multiple guide cylinders (240), punching knives (230) and positioning cylinders (320). Multiple punching knives (230) are arranged at intervals on the first base (210), multiple guide cylinders (240) are arranged at intervals on the second base (220), and multiple positioning cylinders (320) are arranged at intervals on the third base (310). The guide cylinders (240), punching knives (230) and positioning cylinders (320) correspond to each other one by one.

8. The punching device according to claim 1, characterized in that The upper mold assembly (200) includes a connecting bolt (260) and an elastic member (270). The connecting bolt (260) passes through the second base (220) and is threadedly connected to the first base (210). The elastic member (270) is sleeved on the punching knife (230), and one end of the elastic member (270) abuts against the first base (210), and the other end of the elastic member (270) abuts against the second base (220) or the guide cylinder (240).

9. The punching device according to claim 8, characterized in that The second base (220) includes a first plate (221) and a second plate (222), the first plate (221) is provided with an avoidance hole (2211), the second plate (222) is provided with a mounting hole (2221), the guide cylinder (240) is arranged in the mounting hole (2221), and the end of the guide cylinder (240) close to the first base (210) is provided with an annular limiting groove (242), one end of the elastic member (270) abuts against the first base (210), and the other end of the elastic member (270) passes through the avoidance hole (2211) and abuts against the bottom wall of the annular limiting groove (242).

10. The punching device according to any one of claims 1 to 9, characterized in that: The mounting frame (110) includes a support column (111), a fixed plate (112) and a movable mounting plate (113), the two ends of the support column (111) are respectively connected to the fixed plate (112) and the workbench (100), the driving member (400) is arranged on the fixed plate (112), the output end of the driving member (400) passes through the fixed plate (112) and is connected to the side of the movable mounting plate (113) away from the workbench (100), the upper mold assembly (200) is arranged on the side of the movable mounting plate (113) close to the workbench (100), and the movable mounting plate (113) is provided with a sliding sleeve (114), and the sliding sleeve (114) can slide back and forth along the support column (111).

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