A stripper plate for an automotive stamping die
By improving the stripper plate design and using the precise combination of positioning pins, spring devices and guide sleeves, the problems of positioning accuracy and uneven stripping force in the high-frequency stamping process of traditional stripper plates are solved, achieving stable stripping effect and long service life, and improving the production efficiency and quality of automotive stamping parts.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO JIANGZI MOULD CO LTD
- Filing Date
- 2025-08-25
- Publication Date
- 2026-07-21
AI Technical Summary
Traditional stripper plates suffer from problems such as decreased positioning accuracy, uneven stripping force, and short service life during high-frequency stamping, which affect the production efficiency and product quality of automotive stamping parts.
The device adopts a rectangular stripper plate body, combined with a precise design of positioning pins, spring devices and guide sleeves. The positioning pins adopt a three-section structure, the spring devices are combined structures, and the guide sleeves adopt a double-layer structure. It is connected to the mold by fixing bolts to achieve precise positioning and stable stripping.
It improves the positioning accuracy and service life of the stripper plate, ensures uniform distribution of stripping force, reduces workpiece deformation and surface damage, improves production efficiency and product quality, and reduces production costs.
Smart Images
Figure CN224525794U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of automotive parts mold technology, specifically, it relates to a stripper plate for automotive stamping molds. Background Technology
[0002] In the automotive manufacturing industry, stamping dies are key equipment for producing body parts. The stripper plate, as an important component of the stamping die, primarily functions to separate the workpiece from the punch after stamping, ensuring smooth separation and subsequent processing. Traditional stripper plates typically employ a simple flat plate structure, using springs to provide stripping force and guiding devices for positioning. However, with the increasing precision requirements and faster production cycles in the automotive industry, existing stripper plate technology has revealed several problems. First, the positioning devices of traditional stripper plates often use simple cylindrical locating pins, which are prone to positioning drift during high-frequency stamping, leading to a decrease in workpiece dimensional accuracy. Second, the spring devices of existing stripper plates typically use a single spring structure, resulting in uneven stripping force distribution, which can easily cause workpiece deformation and surface quality issues during stripping. Third, the guiding devices of traditional stripper plates lack an effective lubrication mechanism, making them prone to wear and jamming during long-term use, affecting the movement accuracy and service life of the stripper plate. Furthermore, the contact surface between the existing stripper plate and the workpiece is typically planar, resulting in a limited contact area, low stripping force transmission efficiency, and a tendency to generate localized stress concentrations, thus affecting the surface quality of the workpiece. These technical problems severely restrict the production efficiency and product quality of automotive stamping parts. Particularly in mass production, the frequent replacement and maintenance of the stripper plate significantly increases production costs. Therefore, there is an urgent need to develop a new type of stripper plate for automotive stamping dies to solve the problems of positioning accuracy, uneven stripping force, and short service life inherent in existing technologies. Utility Model Content
[0003] In view of this, the present invention provides a stripper plate for automotive stamping dies, which can solve the technical problems of decreased positioning accuracy of the stripper plate during high-frequency stamping, uneven stripping force leading to workpiece deformation, and short service life of the stripper plate in the prior art. This utility model is implemented as follows: This utility model provides a stripper plate for an automotive stamping die, comprising a stripper plate body, locating pins, spring devices, guide sleeves, and fixing bolts. The stripper plate body has a rectangular plate structure. Multiple locating holes are provided on the upper surface of the stripper plate body, and locating pins are installed in the locating holes. The upper end of the locating pin has a conical guide head, and the lower end of the locating pin has a cylindrical locating section. Multiple spring mounting holes are provided on the lower surface of the stripper plate body, and spring devices are installed in the spring mounting holes. The spring devices include compression springs and spring seats. Guide sleeve mounting positions are provided around the perimeter of the stripper plate body, and guide sleeves are installed at these positions. The inner hole of the guide sleeve is cylindrical, and the outer wall of the guide sleeve is threaded. The stripper plate body is connected to the upper die base of the die by fixing bolts.
[0004] The technical advantages of the stripper plate for an automotive stamping die provided by this utility model are as follows: Through the combined design of the stripper plate body with the locating pin, spring device, guide sleeve, and fixing bolts, precise positioning and stable operation of the stripper plate are achieved. The stripper plate body is made of 45# steel, which has good strength and toughness. The conical guide head and cylindrical locating section design of the locating pin achieve precise positioning. The spring device provides suitable stripping force, the guide sleeve ensures smooth movement of the stripper plate, and the fixing bolts ensure a reliable connection between the stripper plate and the die.
[0005] Based on the above technical solution, the stripper plate of the automobile stamping die of this utility model can be further improved as follows: The positioning pin includes a conical guide head, a cylindrical positioning section, and a connecting neck. The conical guide head is located at the upper end of the positioning pin, and the cone angle of the conical guide head is 30 to 45 degrees. The cylindrical positioning section is located at the lower end of the positioning pin, and the diameter of the cylindrical positioning section matches the diameter of the positioning hole. The connecting neck is located between the conical guide head and the cylindrical positioning section, and the diameter of the connecting neck is smaller than the diameter of the cylindrical positioning section, which is used to provide elastic deformation space for the positioning pin.
[0006] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the three-section structural design of the locating pin—the conical guide head, the cylindrical locating section, and the connecting neck—enables the locating pin to achieve stable guidance and precise positioning during operation. The 30- to 45-degree cone angle design of the conical guide head facilitates the smooth entry of the stripper plate, and the reduced diameter design of the connecting neck provides the locating pin with the necessary elastic deformation space, improving positioning accuracy and service life.
[0007] Furthermore, the spring device includes a compression spring, a spring seat, and a spring cover plate; the upper end of the compression spring abuts against the lower surface of the stripper plate body, and the lower end of the compression spring abuts against the upper surface of the spring seat; the spring seat has a circular disc-shaped structure, and a guide hole is provided in the center of the spring seat, through which the spring seat is fitted onto the spring cover plate; the spring cover plate has a cylindrical structure, and a flange is provided at the upper end of the spring cover plate, the diameter of which is larger than the diameter of the guide hole of the spring seat.
[0008] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the combined structure of the compression spring, spring seat, and spring cover plate of the spring device ensures that the stripper plate can provide a stable stripping force during operation. The circular disc structure and central guide hole design of the spring seat enable the spring device to work stably, while the cylindrical structure and flange design of the spring cover plate prevent the spring seat from falling off, ensuring the reliability and stability of the spring device. The flange can produce slight elastic deformation.
[0009] Furthermore, the guide sleeve includes a sleeve body and an inner liner; the sleeve body has a cylindrical structure, the outer wall of the sleeve body is provided with an M12 thread, and the inner diameter of the sleeve body is 16 mm to 20 mm; the inner liner is disposed in the inner hole of the sleeve body, the inner liner is made of bronze material, and the inner surface of the inner liner is provided with lubrication grooves, which are distributed in a spiral shape; the sleeve body is fixed to the guide sleeve installation position of the stripper plate body by threaded connection, and the inner liner and the sleeve body are connected by interference fit.
[0010] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the double-layer structure design of the guide sleeve body and the inner liner enables precise guidance and smooth movement of the stripper plate. The M12 threaded outer wall design of the sleeve body facilitates installation and disassembly, and the bronze material used for the inner liner has good wear resistance and self-lubricating properties. The spiral lubrication groove design on the surface of the inner liner effectively reduces frictional resistance and improves the service life and guiding accuracy of the guide sleeve.
[0011] Furthermore, the upper surface of the stripping plate body is provided with a plurality of trapezoidal protrusions, the height of which is 1 mm to 3 mm and the apex angle of which is 60 degrees to 80 degrees. The trapezoidal protrusions are evenly distributed along the length direction of the stripping plate body.
[0012] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The trapezoidal protrusion design on the upper surface of the material plate effectively increases the contact area and friction between the stripper plate and the workpiece. The 1 mm to 3 mm height and 60 to 80 degree apex angle design of the trapezoidal protrusions ensure good stripping effect while avoiding damage to the workpiece surface. The evenly spaced distribution design makes the stripping force evenly distributed, improving the stripping quality. Furthermore, the conical guide head surface of the positioning pin is provided with a spiral guide groove, the spiral angle of which is 15 degrees to 25 degrees, the depth of which is 0.2 mm to 0.5 mm, and the width of which is 1 mm to 2 mm.
[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the spiral guide groove design on the conical guide head surface of the locating pin significantly improves the guiding performance and self-cleaning ability of the locating pin. The spiral guide groove's 15-degree to 25-degree helix angle design allows the locating pin to automatically remove chips and debris during operation. The groove depth of 0.2 mm to 0.5 mm and the groove width of 1 mm to 2 mm ensure both cleaning effectiveness and without affecting the strength of the locating pin.
[0014] Furthermore, the compression spring has 8 to 12 coils, the wire diameter is 3 to 5 mm, the outer diameter is 20 to 30 mm, and the free length is 30 to 40 mm.
[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the precise design of the number of coils, wire diameter, outer diameter, and free length of the compression spring ensures that the spring device can provide stable unloading force and good service life. The design of 8 to 12 coils ensures the stability of the spring, the design of 3 mm to 5 mm wire diameter and 20 mm to 30 mm outer diameter meets the strength requirements, and the design of 30 mm to 40 mm free length provides a suitable compression stroke.
[0016] Compared with existing technologies, the beneficial effects of the stripper plate for automotive stamping dies provided by this utility model are as follows: This utility model, through the precise fit design of the stripper plate body with the positioning pin, spring device, guide sleeve, and fixing bolts, fundamentally solves the positioning accuracy problem and uneven stripping force problem existing in existing stripper plates. The three-section structure design of the positioning pin and the spiral guide groove design of the conical guide head enable the stripper plate to maintain stable positioning accuracy during high-frequency stamping, effectively avoiding workpiece dimensional defects caused by positioning deviations. The combination structure of the compression spring, spring seat, and spring cover plate of the spring device ensures uniform distribution and stable output of stripping force, preventing deformation and damage to the workpiece during stripping. The double-layer structure design and spiral lubrication groove design of the guide sleeve significantly improve the movement accuracy and service life of the stripper plate, reducing the accuracy degradation problem caused by friction and wear. The trapezoidal protrusion design on the upper surface of the stripper plate body optimizes the contact state between the stripper plate and the workpiece, making the stripping force distribution more uniform and improving the stripping quality. The coordinated design of the entire structure enables the stripper plate to maintain stable performance during long-term, high-frequency use, effectively extending its service life and reducing production costs. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a front view of a stripper plate for an automotive stamping die. Figure 2 A cross-sectional view of a stripper plate of an automotive stamping die; The attached diagram lists the components represented by each number as follows: 10. Stripper plate body; 11. Spring mounting hole; 12. Trapezoidal protrusion; 20. Locating pin; 21. Conical guide head; 22. Cylindrical positioning section; 23. Connecting neck; 30. Spring device; 31. Compression spring; 32. Spring seat; 33. Spring cover plate; 40. Guide sleeve; 41. Sleeve body; 42. Inner liner. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0020] like Figure 1-2 The diagram shows an embodiment of a stripper plate for an automotive stamping die provided by this utility model. In this embodiment, it includes a stripper plate body 10, a positioning pin 20, a spring device 30, a guide sleeve 40, and fixing bolts. The stripper plate body has a rectangular plate structure. The upper surface of the stripper plate body is provided with multiple positioning holes, and positioning pins are installed in the positioning holes. The upper end of the positioning pin is provided with a conical guide head 21, and the lower end of the positioning pin is provided with a cylindrical positioning section 22. The lower surface of the stripper plate body is provided with multiple spring mounting holes 11, and spring devices are installed in the spring mounting holes. The spring devices include compression springs 31 and spring seats 32. Guide sleeve mounting positions are provided around the perimeter of the stripper plate body. Guide sleeves are installed at the guide sleeve mounting positions. The inner hole of the guide sleeve is cylindrical, and the outer wall of the guide sleeve is threaded. The stripper plate body is connected to the upper die base of the die by fixing bolts.
[0021] In the above technical solution, the positioning pin includes a conical guide head 21, a cylindrical positioning section 22, and a connecting neck 23. The conical guide head is located at the upper end of the positioning pin, and the cone angle of the conical guide head is 30 to 45 degrees. The cylindrical positioning section is located at the lower end of the positioning pin, and the diameter of the cylindrical positioning section matches the diameter of the positioning hole. The connecting neck is located between the conical guide head and the cylindrical positioning section, and the diameter of the connecting neck is smaller than the diameter of the cylindrical positioning section, which is used to provide elastic deformation space for the positioning pin.
[0022] Furthermore, in the above technical solution, the spring device includes a compression spring 31, a spring seat 32, and a spring cover plate 33; the upper end of the compression spring abuts against the lower surface of the stripper plate body, and the lower end of the compression spring abuts against the upper surface of the spring seat; the spring seat has a circular disc-shaped structure, and a guide hole is provided in the center of the spring seat, through which the spring seat is fitted onto the spring cover plate; the spring cover plate has a cylindrical structure, and a flange is provided at the upper end of the spring cover plate, the diameter of which is larger than the diameter of the guide hole of the spring seat.
[0023] Furthermore, in the above technical solution, the guide sleeve includes a sleeve body 41 and an inner liner 42; the sleeve body has a cylindrical structure, the outer wall of the sleeve body is provided with an M12 thread, and the inner diameter of the sleeve body is 16 mm to 20 mm; the inner liner is set in the inner hole of the sleeve body, the inner liner is made of bronze material, and the inner surface of the inner liner is provided with lubrication grooves, which are distributed in a spiral shape; the sleeve body is fixed to the guide sleeve installation position of the stripper plate body by threaded connection, and the inner liner and the sleeve body are connected by interference fit.
[0024] Furthermore, in the above technical solution, the upper surface of the stripper plate body is provided with a plurality of trapezoidal protrusions 12, the height of the trapezoidal protrusions is 1 mm to 3 mm, the apex angle of the trapezoidal protrusions is 60 degrees to 80 degrees, and the trapezoidal protrusions are evenly distributed along the length direction of the stripper plate body.
[0025] Furthermore, in the above technical solution, the conical guide head surface of the positioning pin is provided with a spiral guide groove, the spiral angle of the spiral guide groove is 15 degrees to 25 degrees, the depth of the spiral guide groove is 0.2 mm to 0.5 mm, and the width of the spiral guide groove is 1 mm to 2 mm.
[0026] Furthermore, in the above technical solution, the number of coils of the compression spring is 8 to 12, the diameter of the steel wire of the compression spring is 3 to 5 mm, the outer diameter of the compression spring is 20 to 30 mm, and the free length of the compression spring is 30 to 40 mm.
[0027] First, install the stripper plate body onto the upper die base using fixing bolts, ensuring accurate positioning of the stripper plate body and the die. During installation, guide sleeves are used to achieve precise alignment between the stripper plate and the lower die. Before installation, the inner lubrication groove of the guide sleeve needs to be filled with an appropriate amount of lubricating oil to ensure good lubrication performance. Insert the locating pin into the locating hole of the stripper plate body, with the conical guide head of the locating pin facing upwards, ensuring the fitting accuracy between the locating pin and the locating hole. Install the spring seat, compression spring, and spring cover plate sequentially into the spring mounting hole, adjusting the preload of the spring device to provide suitable stripping force when the stripper plate is in the working position. Before the stamping operation begins, check that all functions of the stripper plate are normal, including the guiding function of the locating pin, the elastic recovery function of the spring device, and the lubrication status of the guide sleeve. During the stamping process, when the upper die descends, the stripper plate achieves precise positioning with the lower die through the guiding action of the locating pin. The trapezoidal protrusions on the upper surface of the stripper plate body contact the workpiece, preparing for the subsequent stripping process. After stamping, the upper die rises, and the stripper plate, under the action of the spring device, applies stripping force to the workpiece. The trapezoidal protrusion design ensures that the stripping force is evenly distributed on the workpiece surface, achieving smooth workpiece removal. During stripping, the spiral guide groove of the locating pin plays a cleaning role, automatically removing chips and debris from the contact surface and maintaining positioning accuracy. The lubrication groove of the guide sleeve continuously provides lubrication during the movement of the stripper plate, ensuring smooth and accurate movement. During long-term use, regularly check the wear condition of each component, replenish the lubricating oil of the guide sleeve in a timely manner, and replace severely worn locating pins and spring devices to ensure that the stripper plate always maintains good working performance.
[0028] The following is a specific embodiment of this utility model: The stripper plate of this utility model is applied in a door outer panel stamping production line of an automobile manufacturing plant. The stripper plate body is made of 45# steel, with dimensions of 600 mm × 400 mm × 25 mm. The upper surface has 24 positioning holes, each 10 mm in diameter and 18 mm deep, arranged in a rectangular array with a center-to-center distance of 50 mm × 80 mm. Each positioning hole houses a positioning pin, made of T10 carbon tool steel, hardened and tempered to a hardness of HRC58-62. The total length of the positioning pin is 20 mm, the conical guide head is 6 mm long with a 35-degree cone angle, the cylindrical positioning section is 10 mm long with a 9.98 mm diameter, and the connecting neck is 4 mm long with an 8 mm diameter. The surface of the conical guide head is machined with a spiral guide groove with a 20-degree helix angle, a groove depth of 0.3 mm, and a groove width of 1.5 mm. The lower surface of the stripper plate body has 16 spring mounting holes, each 25 mm in diameter and 35 mm deep, spaced 100 mm × 120 mm apart. Each hole houses a spring assembly. The compression spring is made of 65Mn spring steel, with 10 coils, a wire diameter of 4 mm, an outer diameter of 24 mm, a free length of 35 mm, and a compression force of 800 Newtons. The spring seat is made of 40Cr alloy steel, with a diameter of 22 mm, a thickness of 5 mm, and a central guide hole diameter of 12 mm. The spring cover plate is made of 40Cr alloy steel, with a diameter of 10 mm, a length of 30 mm, and a top flange diameter of 16 mm. Guide sleeves are located at the four corners of the stripper plate body. These guide sleeves are made of 20CrMnTi carburized steel, with an outer diameter of 30 mm, an inner diameter of 20 mm, a length of 40 mm, and an M30 × 1.5 thread machined on their outer walls. The guide sleeve liner is made of ZCuSn10Pb1 bronze material with a thickness of 3 mm. The inner surface is machined with spiral lubrication grooves, 0.5 mm deep, 2 mm wide, and spaced 6 mm apart. The stripper plate body is connected to the upper mold base of the die by 16 M10×50 fixing bolts made of 35CrMo alloy steel, using matching 65Mn spring steel washers with a thickness of 2.5 mm. The upper surface of the stripper plate body is machined with trapezoidal protrusions, 2 mm high, with a 70-degree apex angle, spaced 20 mm apart along the length, for a total of 30 trapezoidal protrusions. In the stamping production of car door outer panels, with a working cycle of 15 pieces per minute, during 8 hours of continuous production, the positioning accuracy of the stripper plate remained within ±0.05 mm, the stripping force was evenly distributed, and the workpiece surface quality was good, with no scratches or deformation. The lubrication groove design of the guide sleeve effectively reduced frictional resistance, ensuring smooth movement of the stripper plate without jamming. The spiral guide groove of the locating pin automatically removes chips and debris during operation, maintaining good positioning accuracy.The three-element combination structure of the spring device provides a stable stripping force, and the spring's service life reaches over 500,000 cycles. The overall design of the stripper plate achieves the expected technical effect, effectively solving the problems of positioning accuracy, uneven stripping force, and short service life existing in the prior art. It significantly improves the production efficiency and product quality of automotive stamping parts, providing strong technical support for the development of the automotive manufacturing industry.
[0029] Specifically, the principle of this utility model is as follows: This utility model achieves a comprehensive improvement in the working performance of the stripper plate through structural optimization and functional coordination design of each component. Regarding positioning accuracy, a three-section structure design of the positioning pin is adopted. The conical guide head provides initial guidance, and its 30-45 degree cone angle design enables a smooth guiding transition during the stripper plate's descent, avoiding impact and positioning deviation caused by rigid contact. The reduced diameter design of the connecting neck provides elastic deformation space for the positioning pin. When the stripper plate is subjected to lateral force, the connecting neck can generate slight elastic deformation to absorb the impact and protect the cylindrical positioning section from damage. The precise fit between the cylindrical positioning section and the positioning hole ensures accurate positioning of the stripper plate, and the spiral guide groove design on its surface automatically removes chips and debris during operation, preventing a decrease in positioning accuracy due to debris accumulation. Regarding the uniform distribution of stripping force, the three-element combination structure of the spring device plays a crucial role. The 8- to 12-turn design of the compression spring ensures the stability and uniform force output of the spring. The circular disc structure and central guide hole design of the spring seat enable the spring force to be transmitted vertically, avoiding uneven force distribution caused by spring skewing. The flange design of the spring cover plate prevents the spring seat from falling off, ensuring the overall stability of the spring device. In terms of guiding accuracy and service life, the double-layer structure design of the guide sleeve fully utilizes the performance advantages of the materials. The outer sleeve is made of high-strength 20CrMnTi carburized steel to bear the main mechanical load, while the inner liner is made of bronze material with good wear resistance and self-lubricating properties to reduce friction and wear. The spiral lubrication groove design on the inner liner surface forms an effective lubricant storage and distribution system, allowing the lubricant to be evenly distributed on the contact surface during the movement of the stripping plate, significantly reducing frictional resistance and wear. The trapezoidal protrusions on the upper surface of the stripper plate increase the contact area with the workpiece, allowing the stripping force to be distributed more evenly on the workpiece surface. The 60- to 80-degree apex angles of the trapezoidal protrusions ensure good stripping effect while avoiding damage to the workpiece surface.
[0030] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A stripper plate for an automotive stamping die, characterized in that, The system includes a stripper plate body, locating pins, spring devices, guide sleeves, and fixing bolts. The stripper plate body has a rectangular plate structure. The upper surface of the stripper plate body has multiple locating holes, in which locating pins are installed. The upper end of the locating pin has a conical guide head, and the lower end of the locating pin has a cylindrical locating section. The lower surface of the stripper plate body has multiple spring mounting holes, in which spring devices are installed. The spring devices include compression springs and spring seats. The four edges of the stripper plate body have guide sleeve mounting positions, in which guide sleeves are installed. The inner hole of the guide sleeve is cylindrical, and the outer wall of the guide sleeve is threaded. The stripper plate body is connected to the upper mold base of the mold by fixing bolts.
2. The stripper plate of an automotive stamping die according to claim 1, characterized in that, The locating pin includes a conical guide head, a cylindrical locating section, and a connecting neck. The conical guide head is located at the upper end of the locating pin, and the cone angle of the conical guide head is 30 to 45 degrees. The cylindrical locating section is located at the lower end of the locating pin, and the diameter of the cylindrical locating section matches the diameter of the locating hole. The connecting neck is located between the conical guide head and the cylindrical locating section, and the diameter of the connecting neck is smaller than the diameter of the cylindrical locating section, which is used to provide elastic deformation space for the locating pin.
3. The stripper plate of an automotive stamping die according to claim 2, characterized in that, The spring device includes a compression spring, a spring seat, and a spring cover plate; the upper end of the compression spring abuts against the lower surface of the stripper plate body, and the lower end of the compression spring abuts against the upper surface of the spring seat; the spring seat has a circular disc-shaped structure, and a guide hole is provided in the center of the spring seat, through which the spring seat is fitted onto the spring cover plate; the spring cover plate has a cylindrical structure, and a flange is provided at the upper end of the spring cover plate, the diameter of which is larger than the diameter of the guide hole of the spring seat.
4. The stripper plate of an automotive stamping die according to claim 3, characterized in that, The guide sleeve includes a sleeve body and an inner liner; the sleeve body has a cylindrical structure, and the outer wall of the sleeve body is provided with an M12 thread. The inner diameter of the sleeve body is 16 mm to 20 mm; the inner liner is set in the inner hole of the sleeve body, and the inner liner is made of bronze material. The inner surface of the inner liner is provided with lubrication grooves, which are distributed in a spiral shape; the sleeve body is fixed to the guide sleeve installation position of the stripper plate body by threaded connection, and the inner liner and the sleeve body are connected by interference fit.
5. The stripper plate of an automotive stamping die according to claim 4, characterized in that, The upper surface of the stripping plate body is provided with multiple trapezoidal protrusions, the height of which is 1 mm to 3 mm and the apex angle of which is 60 degrees to 80 degrees. The trapezoidal protrusions are evenly distributed along the length of the stripping plate body.
6. The stripper plate of an automotive stamping die according to claim 5, characterized in that, The conical guide head of the positioning pin is provided with a spiral guide groove. The spiral guide groove has a spiral angle of 15 degrees to 25 degrees, a depth of 0.2 mm to 0.5 mm, and a width of 1 mm to 2 mm.
7. The stripper plate of an automotive stamping die according to claim 6, characterized in that, The compression spring has 8 to 12 coils, the wire diameter is 3 to 5 mm, the outer diameter is 20 to 30 mm, and the free length is 30 to 40 mm.