Rubber injection hole sealing nail cutting die

Abstract

The application relates to a rubber liquid injection hole sealing nail cutting die, and relates to the technical field of die machining. The cutting die comprises an upper die, a lower die and a die cutting assembly. The upper die and the lower die are detachably installed with a cutting positioning plate in sliding connection with the upper die and the lower die. An elastic reset assembly is arranged between the upper die and the lower die. A cutting limiting hole for inserting a sealing nail is formed in the cutting positioning plate. The die cutting assembly comprises a lower cutting cylinder fixed to the lower die and an upper cutting die arranged in a cutting groove of the upper die. The upper cutting die can be inserted into the lower cutting cylinder to form a shearing cooperation. The application can effectively solve the problems of low machining efficiency and unstable product qualification rate caused by the reset jamming of the cutting die, and improve the stability of the cutting process and the product consistency.

Description

Technical Field

[0001] This application relates to the field of cutting die technology, and in particular to a cutting die for a rubber injection hole sealing nail. Background Technology

[0002] Rubber injection port sealing nails are core sealing components in critical equipment such as energy storage batteries and hydraulic systems. Their dimensional accuracy and surface quality directly affect the sealing performance and safe operation of the equipment. In industrial production, these sealing nails are typically manufactured using injection molding. The resulting blanks often have gate residue or edge excess, requiring subsequent cutting processes to meet stringent assembly tolerances. Currently, the industry commonly uses mechanical cutting dies to accomplish this process. The basic working principle is to utilize the relative movement of the upper and lower dies to drive a cutting tool to shear the sealing nail blank placed in the positioning hole, thereby removing excess material and obtaining a final product that meets specifications.

[0003] However, in long-term large-scale production practice, existing cutting technologies face the common challenges of insufficient reset stability and limited processing continuity. Especially in high-frequency reciprocating operation environments, the moving parts inside the mold are prone to motion stagnation, resulting in the inability to precisely synchronize mold closing and opening actions. This lack of smoothness in the movement process not only affects the processing cycle of individual products and limits the improvement of overall production efficiency, but also easily leads to workpiece deformation under pressure or cutting position deviation due to incomplete reset, thereby causing fluctuations in yield and making it difficult to meet the stringent requirements of high-end manufacturing fields for the consistency and reliability of parts. Summary of the Invention

[0004] The purpose of this application is to provide a cutting die for rubber injection hole sealing nails to solve the above-mentioned technical problems.

[0005] This application provides a cutting die for cutting rubber injection hole sealing nails, which adopts the following technical solution: A cutting die for cutting rubber injection hole sealing nails includes an upper die, a lower die, and a die cutting assembly. The upper die and lower die are detachably mounted with a cutting positioning plate, which is slidably connected to the lower die. An elastic reset assembly is provided between the cutting positioning plate and the lower die. The cutting positioning plate has an array of cutting limiting holes, into which the injection hole sealing nail is inserted. The die cutting assembly includes a lower cutting cylinder fixed in an array on the upper side of the lower die. The lower cutting cylinder is inserted into the cutting limiting holes. A pressing platform is provided on the upper die, and a cutting groove is arrayed on the pressing platform. An upper cutting blade is provided in the cutting groove, and the upper cutting blade is inserted into the lower cutting cylinder, forming a shearing force between the upper cutting blade and the lower cutting cylinder.

[0006] Optionally, a positioning platform is fixed at the lower end of the lower cutting cylinder, and a positioning groove is provided at the lower end of the cutting limiting hole, the positioning groove cooperating with the positioning platform.

[0007] Optionally, a limiting cutting ring is provided on the upper side of the cutting limiting hole, and the upper side of the cutting positioning plate is a planar structure. The limiting cutting ring is used to limit the cutting depth of the lower cutting cylinder. The limiting cutting ring and the liquid injection hole sealing nail form a cross-sectional structure, which is used to remove burrs around the liquid injection hole sealing nail.

[0008] Optionally, the lower cutting cylinder includes a sliding part and a cutting part, the cutting surface of the limiting cutting ring has an eight-shaped structure, the upper opening diameter of the limiting cutting ring is larger than the outer diameter of the cutting part, and the upper opening diameter of the limiting cutting ring is smaller than the outer diameter of the sliding part.

[0009] Optionally, the upper cutting blade is a solid structure with an arc-shaped cutting groove at its lower end. A discharge hole is provided on the lower mold for passing the cut liquid injection hole sealing nail through. The diameter of the discharge hole is larger than the inner diameter of the lower cutting cylinder. The cut liquid injection hole sealing nail can be dropped through the discharge hole.

[0010] Optionally, the elastic reset assembly includes a limiting slide rod fixed to the lower side of the cutting positioning plate, a sliding hole is formed on the lower mold, the limiting slide rod passes through the sliding hole, a reset spring is fixed at the upper end of the sliding hole, an abutment ring is fixed at the upper end of the reset spring, the abutment ring abuts against the lower side of the cutting positioning plate, and the reset spring and the abutment ring are sleeved on the limiting slide rod.

[0011] Optionally, a displacement groove is provided on the upper side of the lower mold, and the cutting positioning plate is slidably embedded in the displacement groove, thereby limiting the sliding trajectory of the cutting positioning plate.

[0012] Optionally, a hole cleaning plate is provided between the cutting positioning plate and the upper mold. Multiple cleaning protrusions are fixed in an array on the hole cleaning plate. The cleaning protrusions are inserted into the cutting limiting hole and the lower cutting cylinder. The cleaning protrusions are used to clean the rubber residue remaining in the cutting limiting hole and to push the liquid injection hole sealing nail in the lower cutting cylinder.

[0013] In summary, this application includes at least one of the following beneficial technical effects: 1. This application provides a cutting die for rubber injection hole sealing nails. This solution establishes a stable reciprocating motion foundation by setting a detachable and slidably connected cutting positioning plate between the upper and lower molds and cooperating with an elastic reset component. The sealing nails of the injection holes are precisely positioned by means of the cutting limiting holes distributed in an array on the cutting positioning plate, so that the lower cutting cylinder in the die cutting component can be accurately inserted into the limiting hole. On this basis, the upper cutting blade in the upper mold pressing table moves downward to insert the lower cutting cylinder, and the two form a tight shearing fit, thereby achieving efficient cutting of the sealing nails. 2. The restoring force provided by the elastic reset component pushes the cutting positioning plate to automatically reset along the sliding trajectory, effectively avoiding the motion stagnation caused by the lack of buffer and guidance in traditional structures. This ensures that the mold components return to their initial precise position in each cutting cycle, preventing workpiece crushing damage or cutting deviation caused by reset jamming. This effectively solves the technical problems faced by existing cutting technology solutions, such as insufficient reset stability and limited processing continuity. The resulting motion irregularities not only affect the processing cycle of individual products and limit the improvement of overall production efficiency, but also easily cause workpiece deformation or cutting position deviation due to incomplete reset, leading to fluctuations in yield. Therefore, it avoids resource waste caused by equipment failure downtime or increased scrap rate during production, and significantly improves the automation level, operational stability, and product consistency of rubber sealing nail processing. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a cross-sectional structural diagram of an embodiment of this application; Figure 3 This is an embodiment of the present application. Figure 2 A magnified view of the structure at point A in the middle; Figure 4 This is a schematic diagram of the mold structure in an embodiment of this application; Figure 5 This is a schematic diagram of the mold structure according to an embodiment of this application; Figure 6 This is a schematic diagram of the back structure of the mold in an embodiment of this application; Figure 7 This is a schematic diagram of the cutting and positioning plate structure in an embodiment of this application.

[0015] In the diagram, 1. Upper mold; 11. Pressing table; 12. Cutting groove; 2. Lower mold; 21. Feeding hole; 22. Displacement groove; 3. Mold cutting assembly; 31. Lower cutting cylinder; 311. Positioning table; 312. Sliding part; 313. Cutting part; 32. Upper cutting blade; 321. Arc-shaped cutting groove; 4. Cutting positioning plate; 41. Cutting limiting hole; 411. Positioning groove; 412. Limiting cutting ring; 5. Elastic reset assembly; 51. Limiting slide rod; 52. Sliding hole; 53. Reset spring; 54. Abutment ring; 6. Hole cleaning plate; 61. Cleaning protrusion. Detailed Implementation

[0016] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 This application will be described in further detail below.

[0017] Reference Figure 1 , Figure 2 A cutting die for cutting rubber injection hole sealing pins includes an upper die 1, a lower die 2, and a die cutting assembly 3. A cutting positioning plate 4 is detachably installed between the upper die 1 and the lower die 2, and the cutting positioning plate 4 is slidably connected to the lower die 2. An elastic reset assembly 5 is provided between the cutting positioning plate 4 and the lower die 2. Cutting limiting holes 41 are arrayed on the cutting positioning plate 4, and the injection hole sealing pins are inserted into the cutting limiting holes 41. The die cutting assembly 3 includes a lower cutting cylinder 31 arrayed and fixed on the upper side of the lower die 2. The lower cutting cylinder 31 is inserted into the cutting limiting holes 41. A pressing table 11 is provided on the upper die 1, and cutting grooves 12 are arrayed on the pressing table 11. An upper cutting blade 32 is provided in the cutting groove 12 and is inserted into the lower cutting cylinder 31. A shearing force is formed between the upper cutting blade 32 and the lower cutting cylinder 31.

[0018] In this embodiment, the cutting positioning plate 4 serves as an intermediate transition carrier connecting the upper mold 1 and the lower mold 2. Its main function is to provide a positioning reference for the sealing nails of the injection hole to be cut and to guide the cutting action. The cutting positioning plate 4 is detachably installed between the upper mold 1 and the lower mold 2. This detachable installation facilitates the quick replacement of worn parts or cleaning of the mold interior during production. Specifically, conventional mechanical connection methods such as bolt fastening, magnetic adsorption, or sliding guide can be used. This design ensures the overall modularity of the mold and reduces maintenance difficulty.

[0019] The cutting positioning plate 4 is slidably connected to the lower mold 2. This sliding connection ensures that during the cutting process, the cutting positioning plate 4 can move smoothly downward with the downward pressure of the upper mold 1 and return to its original position smoothly after the external force is removed, thereby avoiding rigid interference between components.

[0020] An elastic reset component 5 is provided between the cutting positioning plate 4 and the lower mold 2. In this structure, the elastic reset component 5 is the core functional component for realizing the automatic reset of the cutting positioning plate 4. Its function is to store and release elastic potential energy. When the upper mold 1 presses down and pushes the cutting positioning plate 4 to overcome the elastic displacement, the elastic reset component 5 is compressed; when the external force is released, its elastic force pushes the cutting positioning plate 4 back to its initial position. By setting the elastic reset component 5, the problem of operation jamming caused by the lack of automatic reset function in traditional molds is effectively solved.

[0021] The cutting positioning plate 4 has an array of cutting limiting holes 41, into which the injection hole sealing pins are inserted. The cutting limiting holes 41 are arranged in a predetermined matrix pattern, their number and distribution density matching the production layout of the rubber injection hole sealing pins, to achieve multiple cuttings at once and improve processing efficiency. After the injection hole sealing pin is inserted into the cutting limiting hole 41, the hole wall provides radial restraint to the sealing pin, preventing it from tilting or shifting during the cutting process. The diameter of the cutting limiting holes 41 should be designed to fit the diameter of the sealing pin, typically slightly larger than the outer diameter of the sealing pin for easy insertion.

[0022] The die-cutting assembly 3 includes a lower cutting cylinder 31 arrayed and fixed on the upper side of the lower die 2, with the lower cutting cylinder 31 inserted into the cutting limiting hole 41. In this technical solution, the lower cutting cylinder 31 serves as the stationary cutting component of the die-cutting assembly 3, fixedly mounted on the lower die 2. The design of the lower cutting cylinder 31 being inserted into the cutting limiting hole 41 ensures that the inner wall of the lower cutting cylinder 31 and the cutting limiting hole 41 together form a multi-positioning structure for the sealing pin. The upper end face of the lower cutting cylinder 31 is typically precision ground to form a sharp cutting edge or a flat cutting surface, so as to cooperate with the upper cutting blade 32 to complete the cutting action. The material of the lower cutting cylinder 31 can be high-hardness die steel, high-speed steel, or cemented carbide to ensure sufficient wear resistance and service life.

[0023] A pressing table 11 is provided on the upper mold 1, and cutting grooves 12 are arrayed on the pressing table 11. An upper cutting blade 32 is arranged in the cutting grooves 12. The pressing table 11 is the working surface of the upper mold 1 that directly contacts and applies force to the cutting positioning plate 4, and the flatness of its bottom surface directly affects the cutting quality. The cutting grooves 12 are formed on the pressing table 11, and their positions correspond one-to-one with the lower cutting cylinder 31 and the cutting limiting hole 41. The upper cutting blade 32, as an active cutting component, is installed and fixed in the cutting groove 12, and the shape of the upper cutting blade 32 matches the inner hole or outer circle of the lower cutting cylinder 31. The upper cutting blade 32 can be fixed to the bottom of the cutting groove 12 by interference fit, bolt fixing, or welding to ensure that it does not loosen under frequent impact loads.

[0024] The upper cutting blade 32 is inserted into the lower cutting cylinder 31, creating a shearing force between them. Specifically, as the upper mold 1 descends, the upper cutting blade 32 moves downwards and enters the inner cavity of the lower cutting cylinder 31. At this time, a tight fit gap is formed between the outer wall of the upper cutting blade 32 and the inner wall of the lower cutting cylinder 31 (or between the cutting edge of the upper cutting blade 32 and the upper end face of the lower cutting cylinder 31), which is typically less than the material thickness. As the upper cutting blade 32 continues to descend, the rubber injection hole sealing pin located between them is subjected to the squeezing and shearing action of the upper and lower cutting edges. Under shear stress, the material undergoes slip fracture, thus achieving separation. This fit method utilizes the principle of material shear failure, which, compared to simple squeezing and cutting, can obtain a smoother cut surface, reduce burrs and deformation, and significantly improve the end face quality of the sealing pin.

[0025] The core innovation of this application lies in the construction of a composite cutting die with automatic reset function and precision guiding shearing structure.

[0026] By introducing a sliding cutting positioning plate 4 with an elastic reset component 5 between the upper mold 1 and the lower mold 2, the traditional fixed cutting is transformed into dynamic follow-up cutting; at the same time, by utilizing the precise insertion and cooperation between the lower cutting cylinder 31 and the upper cutting blade 32, a stable shearing pair is constructed, realizing efficient and precise separation of the rubber injection hole sealing nail.

[0027] The working process and principle of this application are as follows: First, the sealing nail of the injection hole to be cut is inserted into the cutting limiting hole 41 of the cutting positioning plate 4. At this time, the lower cutting cylinder 31 has been pre-inserted into the cutting limiting hole 41 and provides initial support and positioning for the sealing nail. Then, the upper mold 1 is driven to move downward, and the pressing table 11 contacts the cutting positioning plate 4 and pushes it to slide downward against the elastic force of the elastic reset component 5. As the upper mold 1 continues to move downward, the upper cutting blade 32 set in the cutting groove 12 of the pressing table 11 is inserted into the lower cutting cylinder 31 to perform a cutting action on the sealing nail located between the two, completing the waste material removal. After the cutting is completed, the upper mold 1 retracts upward. At this time, the elastic reset component 5 releases the stored elastic potential energy, pushes the cutting positioning plate 4 to slide upward along the lower mold 2 to reset, pushes the cut sealing nail out of the working area, and restores it to the initial waiting state, ready for the next cutting cycle.

[0028] Through the above technical solution, this application achieves the following beneficial effects: Because an elastic reset component 5 is provided between the cutting positioning plate 4 and the lower mold 2, and a sliding connection is adopted, it ensures that the cutting positioning plate 4 can quickly and smoothly reset automatically after each cutting action. This effectively avoids the jamming phenomenon caused by poor reset in traditional molds, reduces equipment downtime for adjustment, and significantly improves production efficiency. Simultaneously, because the upper cutting blade 32 is inserted into the lower cutting cylinder 31 to form a shearing force cooperation structure, utilizing the principle of shearing destruction rather than simple extrusion, the flatness of the sealing nail cut is guaranteed, avoiding rubber deformation or damage caused by extrusion, thereby significantly improving the product's finished product qualification rate and appearance quality. Furthermore, the detachable design of the cutting positioning plate 4 makes mold maintenance, cleaning, and replacement of cutting edge components more convenient, reducing maintenance costs during long-term use.

[0029] Reference Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 A positioning platform 311 is fixed at the lower end of the lower cutting cylinder 31, and a positioning groove 411 is provided at the lower end of the cutting limiting hole 41. The positioning groove 411 cooperates with the positioning platform 311.

[0030] The positioning platform 311 is used to cooperate with the lower mold 2 to limit the horizontal displacement of the lower cutting cylinder 31 and ensure its verticality. A positioning groove 411 is formed on the cutting positioning plate 4, and its shape is adapted to the positioning platform 311. Specifically, the positioning platform 311 is embedded inside the positioning groove 411, forming a precise positioning fit structure. In practical applications, the mating surfaces of the positioning platform 311 and the positioning groove 411 can adopt a clearance fit or a transition fit, which can ensure the positional stability of the lower cutting cylinder 31 during the cutting process, preventing radial displacement or wobbling, and also ensure that the cutting positioning plate 4 can smoothly slide up and down and reset under the action of the elastic reset component 5.

[0031] This embedded design of the boss and groove effectively solves the problem of inaccurate positioning between the lower cutting cylinder 31 and the cutting limiting hole 41 caused by machining errors or long-term wear, significantly improving the cutting accuracy and finished product consistency of the rubber injection hole sealing nail. Because a positioning platform 311 is set at the lower end of the lower cutting cylinder 31, and a corresponding positioning groove 411 is set at the lower end of the cutting limiting hole 41, the two interlock to restrict the horizontal freedom of the lower cutting cylinder 31, thus preventing tilting or displacement during cutting. This structural design ensures a uniform shearing gap between the upper cutting blade 32 and the lower cutting cylinder 31, effectively reducing defects such as burrs or incomplete cutting caused by blade asymmetry, and significantly improving the end face flatness and dimensional accuracy of the sealing nail. At the same time, this positioning structure also enhances the overall mold's resistance to lateral loads and extends the mold's service life.

[0032] Reference Figure 2 , Figure 7 A limiting cutting ring 412 is provided on the upper side of the cutting limiting hole 41. The upper side of the cutting positioning plate 4 is a planar structure. The limiting cutting ring 412 is used to limit the cutting depth of the lower cutting cylinder 31. The limiting cutting ring 412 and the liquid injection hole sealing nail form a cross-sectional structure, which is used to remove the burrs around the liquid injection hole sealing nail.

[0033] The limiting cutting ring 412 is specifically positioned at the upper opening of the cutting limiting hole 41, and its inner edge contour matches the outer diameter of the injection hole sealing pin to be cut. In terms of manufacturing process, the limiting cutting ring 412 can be integrally formed with the cutting positioning plate 4, or it can be fixedly installed as an independent component at the edge of the cutting limiting hole 41 through methods such as inlaying, welding, or threaded connection. The upper side of the cutting positioning plate 4 maintains a planar structure. This design ensures uniform force distribution during mold closing, avoiding stress concentration or positioning deviation caused by local protrusions, thereby guaranteeing the stability of the cutting process.

[0034] In this embodiment, the limiting cutting ring 412 plays a crucial dual role. First, as a physical hard limiting structure, it is used to precisely limit the downward depth of the lower cutting cylinder 31. Unlike conventional designs that rely solely on operator experience or simple scales to control the cutting feed, this application innovatively introduces the limiting cutting ring 412 as a depth reference. When the upper mold drives the lower cutting cylinder 31 downward, the end face of the lower cutting cylinder 31 eventually abuts against the upper end face of the limiting cutting ring 412, thereby forcibly stopping the movement. This depth control method based on mechanical contact can control the cutting depth error within a very small tolerance range, effectively avoiding the problems of damage to the sealing nail body due to excessive downward pressure or incomplete cutting due to insufficient downward pressure, significantly improving the consistency of product dimensions.

[0035] Secondly, the limiting cutting ring 412 and the injection hole sealing pin form a sectional structure to remove circumferential burrs. During the injection molding and cutting process of rubber products, due to the elasticity of the material, tiny burrs or flash are easily generated at the root or circumference of the sealing pin. If not removed, they will seriously affect the sealing performance of subsequent assembly.

[0036] This application overcomes the limitations of traditional single-function cutting by utilizing the sharp inner edge of the limiting cutting ring 412 to perform secondary scraping and finishing on the outer periphery of the sealing nail during the cutting process. When the sealing nail passes through the limiting cutting ring 412, its edge can automatically remove burrs attached to the circumference of the sealing nail ring like a chamfering blade, realizing integrated processing of cutting and deburring. This structural design not only eliminates the need for a dedicated deburring process, significantly improving production efficiency, but also ensures the smoothness of the sealing nail surface by eliminating burrs, thereby significantly improving its assembly compatibility and sealing reliability in the injection hole.

[0037] In summary, through the above technical solutions, this application achieves precise control of cutting depth and effective removal of circumferential burrs. Due to the mechanical limiting design of the limiting cutting ring 412, the problem of overcutting or undercutting caused by uncontrollable depth in traditional cutting dies is solved, ensuring that the cutting length of each sealing nail meets the standard. Simultaneously, by utilizing the cooperation between the limiting cutting ring 412 and the cutting surface of the sealing nail, circumferential burrs are automatically removed during the cutting action, overcoming the limitations of single-function dies and significantly improving the surface quality and finished product qualification rate of the rubber injection hole sealing nails.

[0038] Reference Figure 2 , Figure 3 , Figure 4 , Figure 5 The lower cutting cylinder 31 includes a sliding part 312 and a cutting part 313. The cutting surface of the limiting cutting ring 412 is a figure-eight structure. The opening diameter of the upper end of the limiting cutting ring 412 is larger than the outer diameter of the cutting part 313, and the opening diameter of the upper end of the limiting cutting ring 412 is smaller than the outer diameter of the sliding part 312.

[0039] The lower cutting cylinder 31 adopts a segmented structural design, mainly including a sliding part 312 that provides guidance and support, and a cutting part 313 that performs the actual cutting operation. The sliding part 312 is located below and has a larger outer diameter; the cutting part 313 is located above the sliding part 312 and has a smaller outer diameter than the sliding part 312. In one feasible implementation, the sliding part 312 and the cutting part 313 can be integrally formed to ensure overall rigidity; this stepped outer diameter variation design allows the lower cutting cylinder 31 to form a specific mating relationship with the limiting cutting ring 412, thereby achieving different functional zones during movement.

[0040] The inner wall of the limiting cutting ring 412 has an outwardly expanding conical shape along the axial direction, forming a so-called figure-eight structure. Based on the aforementioned dimensional settings, the diameter of the upper opening of the limiting cutting ring 412 is between the outer diameter of the cutting part 313 and the outer diameter of the sliding part 312. When the cutting positioning plate 4 moves downward, the cutting part 313 with the smaller outer diameter can smoothly pass through the upper opening of the limiting cutting ring 412 and enter the working area. The cutting part 313 cooperates with the upper cutting blade 32 to complete the cutting action.

[0041] As the cutting positioning plate 4 continues to descend, the sliding part 312 with a larger outer diameter gradually approaches and eventually abuts against the figure-eight conical surface of the limiting cutting ring 412. Since the outer diameter of the sliding part 312 is larger than the upper opening diameter of the limiting cutting ring 412, the sliding part 312 is blocked by the limiting cutting ring 412, thereby precisely limiting the downward stroke of the cutting positioning plate 4 and effectively preventing damage to the tool or workpiece due to excessive downward movement.

[0042] In addition, the figure-eight shaped conical surface of the limiting cutting ring 412 also plays an automatic guiding role during the contact process of the sliding part 312. If there is a slight horizontal deviation in the lower cutting cylinder 31 during its downward movement, the conical inner wall will generate a radial component force on the sliding part 312, forcing the lower cutting cylinder 31 to automatically correct its posture and ensure the verticality and precise alignment of the cutting action.

[0043] By utilizing the dimensional difference and geometric fit between the sliding part 312 and the figure-eight cut surface, the precise mechanical limit of the cutting depth is achieved, and a self-centering guiding function is provided. This effectively overcomes the problem of cutting instability caused by processing errors or assembly gaps, and significantly improves the stability of mold operation and the consistency of the cut products.

[0044] Reference Figure 2 , Figure 3 , Figure 4 The upper cutting blade 32 is a solid structure. An arc-shaped cutting groove 321 is provided at the lower end of the upper cutting blade 32. A material discharge hole 21 is provided on the lower mold 2. The material discharge hole 21 is used to pass through the cut liquid injection hole sealing nail. The diameter of the material discharge hole 21 is larger than the inner diameter of the lower cutting cylinder 31. The cut liquid injection hole sealing nail can be dropped through the material discharge hole 21.

[0045] This application provides a blanking and cutting tool structure for a rubber injection hole sealing nail cutting die. The upper cutting blade 32 is a solid structure with an arc-shaped cutting groove 321 at its lower end. As the core component for performing the cutting action, the upper cutting blade 32's solid structure design, unlike traditional hollow tubular blades, significantly enhances the blade's bending stiffness and structural strength. This ensures that the blade is less prone to deformation or breakage under high-frequency, high-intensity shearing impacts, thereby guaranteeing the stability and accuracy of the cutting action.

[0046] The contour shape of the arc-shaped groove 321 is adapted to the cross-sectional shape of the part to be cut of the injection hole sealing nail. During the cutting process, the arc-shaped groove 321 can play a key role in guiding stress concentration, so that the rubber material breaks and separates quickly at the cutting edge, effectively avoiding stringing, tearing or uneven cutting caused by uneven force, and ensuring the smoothness and dimensional consistency of the cutting surface.

[0047] A discharge hole 21 is provided on the lower mold 2. The discharge hole 21 is used to pass through the cut liquid injection hole sealing nail. The diameter of the discharge hole 21 is larger than the inner diameter of the lower cutting cylinder 31. The cut liquid injection hole sealing nail can be dropped through the discharge hole 21.

[0048] The discharge hole 21 is set through the lower mold 2 and corresponds vertically to the cutting positions of the lower cutting cylinder 31 and the upper cutting blade 32, forming an automatic discharge channel for the finished product. By setting the diameter of the discharge hole 21 to be larger than the inner diameter of the lower cutting cylinder 31, it is ensured that the injection hole sealing nail has sufficient falling space after cutting, and will not get stuck or blocked at the upper edge of the discharge hole 21. This large-diameter discharge design, combined with the internal space of the lower cutting cylinder 31, allows the finished product to pass smoothly through the lower mold 2 by its own gravity after losing support. Automatic discharge can be achieved without additional ejection mechanism or manual intervention, thus realizing continuous automated connection between the cutting process and the discharge process, and greatly improving the processing efficiency and production line cycle of rubber injection hole sealing nails.

[0049] In actual operation, the solid upper cutting blade 32 moves downward under the action of driving force and inserts into the lower cutting cylinder 31 to contact the sealing nail. The arc-shaped cutting groove 321 at the lower end cooperates with the cutting edge of the lower cutting cylinder 31 to precisely cut the rubber injection hole sealing nail.

[0050] After the cutting action is completed, the separated finished sealing nail loses the support of the bottom of the lower cutting cylinder 31 and falls directly into the discharge hole 21 directly below. Since the diameter of the discharge hole 21 is larger than the inner diameter of the lower cutting cylinder 31, the sealing nail will not interfere with the hole wall of the discharge hole 21 during the falling process, and can smoothly pass through the lower mold 2 and be discharged into the collection container, making room for the next cutting cycle.

[0051] Through the above technical solutions, this application achieves high strength of the cutting tool and automated discharge of finished products. On the one hand, the solid upper cutting tool 32, combined with the arc-shaped cutting groove 321, solves the problems of easy deformation and poor cutting quality of traditional tools, and improves the stability of cutting and the qualified rate of finished products. On the other hand, by opening a large-diameter discharge hole 21 on the lower mold 2, a smooth material discharge channel is constructed, which solves the technical problem that the sealing nails are difficult to discharge automatically after cutting and require manual intervention, affecting production efficiency. This significantly reduces the labor intensity of operators and improves the automation level and production efficiency of the overall processing equipment.

[0052] Reference Figure 2 , Figure 3The elastic reset component 5 includes a limiting slide rod 51 fixed to the lower side of the cutting positioning plate 4. A sliding hole 52 is provided on the lower mold 2. The limiting slide rod 51 passes through the sliding hole 52. A reset spring 53 is fixed at the upper end of the sliding hole 52. An abutment ring 54 is fixed at the upper end of the reset spring 53. The abutment ring 54 abuts against the lower side of the cutting positioning plate 4. The reset spring 53 and the abutment ring 54 are sleeved on the limiting slide rod 51.

[0053] This embodiment provides an elastic reset assembly 5. The elastic reset assembly 5 includes a limiting slide rod 51, a sliding hole 52, a reset spring 53, and an abutment ring 54. Specifically, the elastic reset assembly 5 includes a limiting slide rod 51 fixed to the lower side of the cutting positioning plate 4, which serves as a guide and support. One end of the limiting slide rod 51 can be fixedly connected to the lower surface of the cutting positioning plate 4 via a threaded connection, interference fit, or welding, while the other end extends downwards.

[0054] A sliding hole 52 is provided on the lower mold 2, through which the limiting slide rod 51 passes. The sliding hole 52 is a through hole opened on the lower mold 2, and the position of the sliding hole 52 corresponds to that of the limiting slide rod 51.

[0055] The inner diameter of the sliding hole 52 matches the outer diameter of the limiting slide rod 51, forming a clearance fit between them, thereby allowing the limiting slide rod 51 to reciprocate axially within the sliding hole 52. The sliding hole 52 radially constrains the movement trajectory of the limiting slide rod 51, ensuring that the cutting positioning plate 4 maintains a horizontal posture during lifting and lowering, and preventing tilting or jamming.

[0056] A return spring 53 is fixed to the upper end of the sliding hole 52, and an abutment ring 54 is fixed to the upper end of the return spring 53. The abutment ring 54 abuts against the lower side of the cutting positioning plate 4. The return spring 53 and the abutment ring 54 are sleeved on the limiting slide rod 51. The return spring 53 is an elastic energy storage element used to provide the return force for the cutting positioning plate 4. The return spring 53 can be a helical compression spring, and the material of the return spring 53 can be alloy spring steel or stainless steel to have good elastic properties and fatigue resistance. The lower end of the return spring 53 can be directly fixed to the bottom of the sliding hole 52 or fixed to the upper surface of the lower mold 2. The upper end of the return spring 53 is fixedly connected to the abutment ring 54. The abutment ring 54 has a ring-shaped plate structure, is sleeved on the limiting slide rod 51, and can slide along the axial direction of the limiting slide rod 51. The abutment ring 54 is used to transmit the elastic force of the return spring 53 to the cutting positioning plate 4.

[0057] In its natural state, the return spring 53 is in a pre-compressed state, continuously pushing upward against the cutting positioning plate 4 via the abutment ring 54, keeping the cutting positioning plate 4 in its upper limit position. When the upper mold presses downward, the cutting positioning plate 4 is forced downward against the elastic force of the return spring 53, at which point the return spring 53 is further compressed, storing elastic potential energy. The elastic force F of the return spring 53 and its compression amount x satisfy Hooke's Law, i.e.: F = k·x Where k is the spring constant of the return spring 53 (N / mm), and x is the compression of the return spring 53 (mm).

[0058] After the upper mold returns to its original position, the return spring 53 releases its stored elastic potential energy, pushing the cutting positioning plate 4 upward along the limiting slide bar 51 via the abutment ring 54 until it returns to its initial working position. The limiting slide bar 51 passes through the return spring 53 and the abutment ring 54, providing radial support for the return spring 53 to prevent it from bending and becoming unstable during compression, and also limiting the maximum stroke of the abutment ring 54, thus acting as a guide to prevent detachment.

[0059] The precise fit between the limiting slide rod 51 and the sliding hole 52 ensures that the vertical freedom of movement of the cutting positioning plate 4 is strictly limited, eliminating lateral sway interference. The return spring 53 is sleeved on the outside of the limiting slide rod 51, using the limiting slide rod 51 as the central axis to effectively avoid radial torsion caused by the spring during high-frequency compression and rebound. The abutment ring 54 converts the point contact or line contact pressure of the spring into surface contact pressure on the bottom surface of the cutting positioning plate 4, making the return thrust distribution more uniform and avoiding deformation of the positioning plate caused by local stress concentration.

[0060] Based on the above structural design, this application achieves stable and reliable operation of the elastic reset assembly 5. By adopting an integrated design of the limiting slide bar 51, sliding hole 52, reset spring 53, and abutment ring 54, and utilizing the guiding effect of the limiting slide bar 51 and the energy storage characteristics of the reset spring 53, the problems of loose structure, uneven reset force, and easy spring deflection and failure in traditional mold reset mechanisms are solved. This structure not only ensures that the cutting positioning plate 4 can quickly and accurately reset after the cutting action, preparing for the next cutting, thus significantly improving the cutting efficiency of the rubber injection hole sealing nail; at the same time, the smooth reset process effectively avoids sealing nail compression damage caused by reset jamming or impact, significantly improving the finished product's pass rate and quality consistency.

[0061] Reference Figure 2 , Figure 4 , Figure 5 A displacement groove 22 is provided on the upper side of the lower mold 2, and the cutting positioning plate 4 is slidably embedded in the displacement groove 22. The sliding trajectory of the cutting positioning plate 4 is limited by the displacement groove 22.

[0062] This application provides a guide and limiting structure for a cutting positioning plate. A displacement groove 22 is provided on the upper side of the lower mold 2. The displacement groove 22 serves as a linear guide mechanism to constrain the motion degrees of freedom of the cutting positioning plate 4, ensuring that it maintains a defined path when it is raised, lowered, or reciprocated.

[0063] The cutting positioning plate 4 is slidably fitted inside the displacement groove 22. The cross-sectional shape of the displacement groove 22 is adapted to the side profile of the cutting positioning plate 4, forming a precise sliding fit. When the cutting positioning plate 4 is subjected to external pressure or the driving force of the elastic reset component 5, its side wall slides tightly against the inner wall of the displacement groove 22, thus being forcibly restricted to linear movement only along the extension direction of the groove. The displacement groove 22 is provided on the upper side of the lower mold 2, and the cutting positioning plate 4 is slidably fitted inside the displacement groove 22. By limiting the sliding trajectory of the cutting positioning plate 4 through the displacement groove 22, the lateral offset, torsion or shaking that may occur during the movement of the cutting positioning plate 4 is effectively eliminated, ensuring the coaxiality and repeatability of the mold during the mold closing and opening processes.

[0064] The cooperation between the displacement slide 22 and the cutting positioning plate 4 constitutes a high-rigidity mechanical guiding system. During the cutting operation, the upper mold 1 presses down, causing the cutting positioning plate 4 to slide down within the displacement slide 22. The sidewall of the displacement slide 22 provides support against lateral overturning moments, allowing the cutting positioning plate 4 to smoothly transmit pressure to the lower cutting cylinder 31 and the liquid injection hole sealing pin, avoiding damage to the cutting blade or skewed cutting of the sealing pin due to tilting of the positioning plate. After cutting is completed, the elastic reset component 5 drives the cutting positioning plate 4 to move upward and reset. At this time, the displacement slide 22 continues to play a guiding role, ensuring that the reset action is rapid, smooth, and without jamming. This solves the mechanical jamming problem that easily occurs in the reciprocating motion of traditional non-guided molds, extends the service life of the mold, and improves the yield rate.

[0065] Through the above technical solution, this application achieves a strict physical constraint on the movement trajectory of the cutting positioning plate 4 by integrating a displacement groove 22 into the lower mold 2 and utilizing the fitting of the groove with the cutting positioning plate 4. This design structurally eliminates the non-linear movement tendency of the cutting positioning plate 4, significantly improving its stability and reliability in high-frequency reciprocating motion, and ensuring the consistency and accuracy of the cutting process of the rubber injection hole sealing nail.

[0066] Reference Figure 1A hole cleaning plate 6 is provided between the cutting positioning plate 4 and the upper mold 1. Multiple cleaning protrusions 61 are fixed in an array on the hole cleaning plate 6. The cleaning protrusions 61 are inserted into the cutting limiting hole 41 and the lower cutting cylinder 31. The cleaning protrusions 61 are used to clean the rubber residue remaining in the cutting limiting hole 41 and to push the liquid injection hole sealing nail in the lower cutting cylinder 31.

[0067] This application embodiment provides a hole cleaning plate 6. A hole cleaning plate 6 is disposed between the cutting positioning plate 4 and the upper mold 1. Multiple cleaning protrusions 61 are fixedly arranged in an array on the hole cleaning plate 6. The cleaning protrusions 61 are inserted into the cutting limiting hole 41 and the lower cutting cylinder 31. The cleaning protrusions 61 are used to clean residual rubber in the cutting limiting hole 41 and to push away the sealing pins of the injection hole in the lower cutting cylinder 31.

[0068] The hole cleaning plate 6 is positioned between the cutting positioning plate 4 and the upper mold 1. Its function is to simultaneously perform hole cleaning and material pushing operations during the mold opening and closing process. Multiple cleaning protrusions 61 are fixedly arranged in an array on the hole cleaning plate 6. The positions of these cleaning protrusions 61 correspond one-to-one with the array positions of the cutting limiting holes 41 and the lower cutting cylinder 31. The outer diameter of the cleaning protrusions 61 is designed to be slightly smaller than the inner diameter of the cutting limiting holes 41 and the lower cutting cylinder 31 to ensure smooth entry and exit while maintaining an appropriate clearance.

[0069] When the cleaning plate 6 moves downwards to close the mold, the cleaning protrusion 61 extends into the cutting limiting hole 41 and the lower cutting cylinder 31. During this process, the sidewall of the cleaning protrusion 61 slides relative to the inner wall of the channel, using physical scraping to remove and carry away the rubber residue adhering to the inner wall. This design achieves an automatic cleaning function without an additional power source, effectively preventing channel blockage caused by the accumulation of impurities, ensuring the long-term cleanliness of the cutting limiting hole 41 and the inner cavity of the lower cutting cylinder 31, thereby maintaining the stability of cutting accuracy.

[0070] Furthermore, after the cutting operation is completed, the hole cleaning plate 6 is lifted and reset, at which time the cleaning protrusion 61 moves upward accordingly. During the upward movement, the lower end face of the cleaning protrusion 61 contacts the already cut liquid injection hole sealing nail located inside the lower cutting cylinder 31, and applies an upward pushing force or disturbance to it, helping to break any vacuum adsorption or static friction that may exist between the sealing nail and the hole wall, thus promoting its smooth passage through the discharge hole 21 to complete the material discharge. This dual-function design, which combines cleaning and material pushing, avoids product damage caused by the sealing nail remaining in the hole.

[0071] Through the above technical solution, this application achieves online self-cleaning and automatic unloading functions for the mold. Due to the installation of the hole cleaning plate 6 and the cleaning protrusion 61, the mechanical movement of the mold opening and closing automatically cleans the rubber residue inside the cutting limit hole 41 and the lower cutting cylinder 31, solving the technical problem of residual rubber impurities inside the cutting limit hole and the lower cutting cylinder affecting the subsequent cutting quality. This effectively avoids mold jamming and positioning deviation caused by impurity accumulation, ensures the consistency and smoothness of the sealing nail cutting surface, extends the mold maintenance cycle, reduces manual maintenance costs, and significantly improves the overall operating efficiency and product qualification rate of the rubber injection hole sealing nail cutting die.

[0072] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cutting die for cutting rubber injection hole sealing pins, comprising an upper die (1), a lower die (2), and a die cutting assembly (3), characterized in that, A cutting positioning plate (4) is detachably installed between the upper mold (1) and the lower mold (2). The cutting positioning plate (4) is slidably connected to the lower mold (2). An elastic reset component (5) is provided between the cutting positioning plate (4) and the lower mold (2). Cutting limiting holes (41) are arrayed on the cutting positioning plate (4). The liquid injection hole sealing nail is inserted into the cutting limiting hole (41). The mold cutting component (3) includes an array fixed on the lower mold. The lower cutting cylinder (31) on the upper side of the mold (2) is inserted into the cutting limiting hole (41). The upper mold (1) is provided with a pressing table (11). The pressing table (11) is provided with an array of cutting grooves (12). An upper cutting blade (32) is provided in the cutting groove (12). The upper cutting blade (32) is inserted into the lower cutting cylinder (31). A shearing force is formed between the upper cutting blade (32) and the lower cutting cylinder (31).

2. The rubber injection hole sealing nail cutting die according to claim 1, characterized in that, A positioning platform (311) is fixed at the lower end of the lower cutting cylinder (31), and a positioning groove (411) is provided at the lower end of the cutting limiting hole (41). The positioning groove (411) cooperates with the positioning platform (311).

3. The rubber injection hole sealing nail cutting die according to claim 2, characterized in that, A limiting cutting ring (412) is provided on the upper side of the cutting limiting hole (41), and the upper side of the cutting positioning plate (4) is a planar structure. The limiting cutting ring (412) is used to limit the cutting depth of the lower cutting cylinder (31). The limiting cutting ring (412) and the liquid injection hole sealing nail form a cross-sectional structure, which is used to remove the burrs around the liquid injection hole sealing nail.

4. The rubber injection hole sealing nail cutting die according to claim 3, characterized in that, The lower cutting cylinder (31) includes a sliding part (312) and a cutting part (313). The cutting surface of the limiting cutting ring (412) is a figure-eight structure. The upper opening diameter of the limiting cutting ring (412) is larger than the outer diameter of the cutting part (313), and the upper opening diameter of the limiting cutting ring (412) is smaller than the outer diameter of the sliding part (312).

5. The rubber injection hole sealing nail cutting die according to claim 4, characterized in that, The upper cutting blade (32) is a solid structure. An arc-shaped cutting groove (321) is provided at the lower end of the upper cutting blade (32). A feeding hole (21) is provided on the lower mold (2). The feeding hole (21) is used to pass through the cut liquid injection hole sealing nail. The diameter of the feeding hole (21) is larger than the inner diameter of the lower cutting cylinder (31). The cut liquid injection hole sealing nail can be dropped through the feeding hole (21).

6. The rubber injection hole sealing nail cutting die according to claim 5, characterized in that, The elastic reset assembly (5) includes a limiting slide rod (51) fixed on the lower side of the cutting positioning plate (4). There is a sliding hole (52) on the lower mold (2). The limiting slide rod (51) passes through the sliding hole (52). A reset spring (53) is fixed at the upper end of the sliding hole (52). An abutment ring (54) is fixed at the upper end of the reset spring (53). The abutment ring (54) abuts against the lower side of the cutting positioning plate (4). The reset spring (53) and the abutment ring (54) are sleeved on the limiting slide rod (51).

7. The rubber injection hole sealing nail cutting die according to claim 6, characterized in that, A displacement groove (22) is provided on the upper side of the lower mold (2), and the cutting positioning plate (4) is slidably embedded in the displacement groove (22), and the sliding trajectory of the cutting positioning plate (4) is limited by the displacement groove (22).

8. The rubber injection hole sealing nail cutting die according to claim 7, characterized in that, A hole cleaning plate (6) is provided between the cutting positioning plate (4) and the upper mold (1). Multiple cleaning protrusions (61) are fixed in an array on the hole cleaning plate (6). The cleaning protrusions (61) are inserted into the cutting limiting hole (41) and the lower cutting cylinder (31). The cleaning protrusions (61) are used to clean the rubber residue remaining in the cutting limiting hole (41) and to push the liquid injection hole sealing nail in the lower cutting cylinder (31).

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