Air spring iron base stamping spigot die

Abstract

The air spring iron base stamping seam allowance die comprises a bottom plate, an inward shrinkage core pulling structure and an outward shrinkage buckling structure, the inward shrinkage core pulling structure is provided with an installation base, a pulling core and a sliding block set, the pulling core is provided with an inclined guide rail, and a profiled groove is formed in the top of the sliding block set; the external shrinkage buckling structure is provided with an upper die ring and sliding inserts, the upper die ring is provided with a conical ring wall, the sliding inserts are provided with inverted buckle forming parts, the upper die ring moves downwards to enable the sliding inserts to gather together during stamping, the sliding block sets move in a guiding mode according to the guide rails to complete seam allowance manufacturing, and various auxiliary structures such as elastic pieces and stripper plates facilitating stamping and demolding are further arranged. According to the air spring iron base seam allowance stamping device, the technical effects that seam allowance stamping manufacturing of an air spring iron base is efficiently and accurately completed, demolding is convenient, and the production efficiency and the product quality are improved are achieved.

Description

Technical Field

[0001] The present application relates to the field of mechanical processing, and in particular to a stamping die for an iron base of an air spring. Background Art

[0002] In the field of mechanical manufacturing, air springs, as important shock-absorbing components, are widely used in numerous industries, including automobiles, rail transportation, and industrial equipment. With the continuous development of these industries, the performance and quality requirements for air springs are also increasing. As a key component of air springs, the processing quality of the iron tension base of the air spring directly affects the overall performance of the air spring. A high-quality base can improve the stability, reliability, and service life of the air spring, thereby ensuring the safe and stable operation of related equipment and promoting the efficient development of various industries.

[0003] Traditionally, lathe machining has been widely used to create the stoppers of iron air spring extension bases. Furthermore, when undercuts were required to be added to the periphery of the stoppers after the base was stretched, lathe machining was also employed. Lathe machining is a well-established and common metalworking method, using the relative motion between the tool and the rotating workpiece to gradually remove material to achieve the desired shape and size. While this method can meet basic machining requirements to a certain extent, it requires a long processing time and the overall production process is relatively cumbersome.

[0004] However, the long-standing reliance on lathes to machine the stoppers of the iron extension bases of air springs has presented numerous significant drawbacks. First, the production cycle is excessively long, significantly reducing efficiency and making it difficult to meet the market's demand for rapid product delivery. Second, unstable machining dimensions can easily lead to inconsistent product quality, affecting the assembly accuracy and performance of the air springs. Therefore, there is still room for improvement. Summary of the Invention

[0005] In order to improve the production efficiency of the base and product consistency, the present application provides an air spring iron base stamping stopper die.

[0006] The present application provides an air spring iron base stamping die that adopts the following technical solution: A stamping die for an air spring iron base, comprising a base plate, an inward-shrinking core-pulling structure, and an outward-shrinking retaining structure, wherein the inward-shrinking core-pulling structure comprises a mounting seat arranged on the base plate, a core-pulling structure arranged on the mounting seat, and a plurality of slider groups circumferentially distributed at the core-pulling position, wherein a plurality of guide rails slidably engaged with the slider groups are arranged on the circumference of the core-pulling, and the guide rails are arranged obliquely, wherein the inclined upper ends of the plurality of guide rails converge toward the center direction of the core-pulling, and the inclined lower ends of the plurality of guide rails diverge toward the center direction away from the core-pulling, and the outer positions of the tops of the plurality of slider groups are all inwardly recessed and provided with grooves; The outward shrinking buckling structure includes an upper die ring and a plurality of sliding inserts. A tapered ring wall with a narrow upper portion and a wide lower portion is provided on the inner side of the lower portion of the upper die ring. The plurality of sliding inserts are circumferentially distributed on the tapered ring wall. An undercut forming portion is protruded from the inner side of the sliding insert. When stamping a workpiece, the workpiece is sleeved on the outer periphery of several sliders, and the upper die ring is sleeved on the outer periphery of the top of the workpiece. By driving the upper die ring to move vertically downward, several of the sliding inserts gather inward under the guidance of the conical ring wall to apply radial contraction force to the top of the workpiece, so that the sliding inserts are fastened into the workpiece. Several of the slider groups move from top to bottom and from inside to outside at the same time under the guidance of the core-pulling guide rail to complete the production of the workpiece stop.

[0007] By adopting the above technical solution, the guide rail in the inward-retracting core-pulling structure is used, which is inclined and converges toward the core-pulling center at the upper end and diverges away from the core-pulling center at the lower end, so that the slider group can move from top to bottom and from inside to outside at the same time under the guidance of the core-pulling guide rail; the tapered ring wall with a narrow top and a wide bottom is used in the outward-retracting retaining structure, so that the sliding insert applies a radial contraction force on the top of the workpiece when moving inward and retains it in the workpiece, thereby completing the stamping production of the workpiece stop. Compared with lathe processing, the mold is simple to install and easy to operate, which can avoid the problems of workpiece undercut and adhesion, and improve working stability and product consistency.

[0008] Preferably, the sliding insert is an arc-shaped pressure ring unit, and an elastic member is provided between adjacent pressure ring units, and the elastic member is used to drive adjacent pressure ring units away from each other; when performing a stamping operation, several of the pressure ring units gather inward under the guidance of the conical ring wall and form a closed ring body, so that a ring-shaped closed undercut structure is formed on the outer periphery of the top of the workpiece; when demolding, several of the pressure ring units open and reset under the elastic force of the elastic member.

[0009] By adopting the above technical solution, the sliding insert is set as an arc-shaped pressure ring unit, and an elastic member is set between adjacent pressure ring units. During the stamping operation, the guiding effect of the conical ring wall can make the pressure ring unit gather inward to form a closed ring body, which can accurately form an annular closed undercut structure on the top periphery of the workpiece; during demolding, the elastic force of the elastic member can make the pressure ring unit automatically open and reset, avoiding undercut and adhesion of the workpiece, effectively reducing the difficulty of demolding, and improving working stability and product consistency.

[0010] Preferably, the outward retractable retaining structure also includes a stripping plate, and a vertical ring wall is provided on the inner side of the top of the upper mold ring, and the stripping plate is vertically slidably connected to the vertical ring wall; when demolding, the bottom of the stripping plate is against the top position of the workpiece, and the upper mold ring moves upward, and several of the pressure ring units are expanded outward under the elastic force of the elastic member and disengaged from the undercut structure of the workpiece.

[0011] By adopting the above technical solution, during demoulding, the bottom of the stripper plate can press against the top position of the workpiece to keep the workpiece stable. Then, as the upper die ring moves upward, the pressure ring units can move away from each other under the elastic force of the elastic member, so that several pressure ring units are opened outward and separated from the undercut structure of the workpiece, thereby avoiding demoulding difficulties caused by undercutting and adhesion of the workpiece, and improving work stability and product consistency.

[0012] Preferably, a limiting ring is provided on the outer peripheral fixed sleeve of the upper mold ring, and a limiting portion is provided on the bottom of the limiting ring. The limiting portion protrudes inwardly and is provided on the inner peripheral wall of the upper mold ring. When the plurality of the pressure ring units are opened and reset under the elastic force of the elastic member, the pressure ring units rest against the upper surface of the limiting portion, and the limiting portion serves to limit the pressure ring units.

[0013] By adopting the above technical solution, when a limiting ring is fixedly sleeved on the outer periphery of the upper mold ring, and a limiting portion protruding inwardly to the inner peripheral wall of the upper mold ring is provided at the bottom of the limiting ring, during the process of several pressure ring units opening and resetting under the elastic force of the elastic member, the pressure ring unit contacts the upper surface of the limiting portion, and the limiting portion can limit the opening position of the pressure ring unit, thereby preventing the pressure ring unit from excessively opening and separating from the upper mold ring, ensuring the consistency of the reset position of each pressure ring unit each time, thereby improving the stability and accuracy of the mold movement during the demolding stage, and further improving product quality and production efficiency.

[0014] Preferably, several of the slider groups are divided into inner sliders and outer sliders arranged at intervals, and several of the guide rails are divided into first guide rails and second guide rails with different core pulling angles. The outer slider slides in cooperation with the first guide rail, and the inner slider slides in cooperation with the second guide rail. The inner slider and the outer slider perform differential sliding cooperation, and the inner slider moves up and down synchronously with the inner slider.

[0015] By adopting the above technical solution, the first guide rail and the second guide rail with different core pulling angles cooperate to make the inner slider and the outer slider slide differentially, avoiding the interference of the trajectories of the sliders in the retracted core pulling structure when they move up and down and in and out at the same time, effectively avoiding the demoulding difficulties caused by the backlash and adhesion of the workpiece, and improving the work stability and product consistency.

[0016] Preferably, a vertical sliding sleeve on the outer periphery of the mounting seat is provided with a stripping ring. When demolding, the outer sliding block is pushed upward by moving the stripping ring upward. Several of the outer sliding blocks move upward and inward under the guidance of the first guide rail, and the inner sliding blocks move upward and inward under the guidance of the second guide rail.

[0017] By adopting the above technical solution, when demolding, the upward moving stripping ring can push the outer slider, so that the outer slider moves upward and inward under the guidance of the first guide rail, and the inner slider moves upward and inward under the guidance of the second guide rail and differential sliding cooperation with the outer slider, thereby avoiding the workpiece from being reversed or stuck, facilitating demolding, and improving working stability and product consistency.

[0018] Preferably, a plurality of ejection holes are provided at the base, and the plurality of ejection holes are located directly below the stripping ring. When demoulding, the ejection pins cooperating with the ejection holes pass through the ejection holes and support the stripping ring to realize the upward movement of the stripping ring.

[0019] By adopting the above technical solution, the ejection pin is used to pass through the ejection hole to support the stripping ring, so that the stripping ring can be moved upward. Combined with the inward-shrinking core-pulling structure and the outward-shrinking buckling structure, the demoulding difficulties caused by the workpiece being inverted or stuck can be avoided, thereby improving the working stability and product consistency. In addition, this demoulding method also makes the molding process simpler and easier to operate.

[0020] Preferably, the stripping ring is provided with a plurality of sliding grooves, and the plurality of sliding grooves are circumferentially distributed on the top of the stripping ring and extend radially along the stripping ring, and the bottoms of the plurality of outer sliding blocks are provided with connectors that slide in cooperation with the sliding grooves.

[0021] By adopting the above technical solution, a slide groove is provided on the stripping ring, and a connecting piece is provided at the bottom of the outer slider to cooperate with it, so that the stripping ring can drive the outer slider to move more stably and accurately when moving upward, further effectively avoiding the demoulding difficulties caused by the inverted buckle and adhesion of the workpiece, improving the work stability and product consistency, and the mold installation process is simple and easy to operate.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Use stamping dies instead of lathe processing to shorten the production cycle and improve production efficiency; 2. Use the inward-shrinking core-pulling structure and the outward-shrinking buckling structure to cooperate with stamping to improve the processing dimensional stability and ensure product quality and assembly accuracy; 3. The collaborative control logic during the stamping process avoids workpiece undercuts and adhesion, solves the problem of demoulding difficulties, and enhances work stability and product consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the base in a stamping stopper mold of an air spring iron base in an embodiment of the present application.

[0024] Figure 2 yes Figure 1 Enlarged schematic diagram of point A in the middle.

[0025] Figure 3This is an exploded view of a stamping stopper mold for an air spring iron base in an embodiment of the present application.

[0026] Figure 4 This is a cross-sectional view of a stamping stopper die for an air spring iron base in a stamping state according to an embodiment of the present application.

[0027] Figure 5 It is a structural schematic diagram of a sliding insert in a stamping stopper mold for an air spring iron base according to an embodiment of the present application.

[0028] Figure 6 This is a schematic diagram of the positional relationship between the slider group, the core pulling and the stripping ring in the demoulding state in a stamping stopper mold of an air spring iron base in an embodiment of the present application.

[0029] Figure 7 It is a structural schematic diagram of a core pulling and mounting seat in a stamping stopper die for an air spring iron base in an embodiment of the present application.

[0030] Figure 8 It is a structural schematic diagram of the inner and outer sliders in a stamping stopper mold for an air spring iron base in an embodiment of the present application.

[0031] Figure 9 It is a structural schematic diagram of an inner slider in a stamping stopper mold for an air spring iron base according to an embodiment of the present application.

[0032] Explanation of the accompanying drawings: 1. Outward-retracting retaining structure; 11. Mounting plate; 12. Stripping plate; 13. Upper mold ring; 131. Conical ring wall; 132. Vertical ring wall; 14. Limiting ring; 141. Limiting portion; 15. Pressing ring unit; 151. Channel; 152. Undercut forming portion; 2. Inward-retracting core-pulling structure; 21. Outer slider; 22. Inner slider; 23. Core pulling; 231. First guide rail; 232. Second guide rail; 24. Stripping ring; 241. Slide groove; 25. Mounting seat; 26. Bottom plate; 261. Top hole; 3. Connecting piece; 4. Groove. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-9 This application is described in further detail.

[0034] The embodiment of the present application discloses a die for stamping a stopper of an air spring iron base. The base structure is as follows: Figure 1 and Figure 2 , the stamping die structure refers to Figure 3 and Figure 4, specifically including a base plate 26, an inward-shrinking core-pulling structure 2 and an outward-shrinking buckling structure 1, wherein the inward-shrinking core-pulling structure 2 and the outward-shrinking buckling structure 1 are arranged on the base plate 26, and the two cooperate with each other, are triggered by the same driving source, and are controlled by the hydraulic press stroke, which can effectively complete the workpiece stop production and facilitate demolding, avoid workpiece backlash and adhesion, and improve working stability and product consistency.

[0035] Specifically, the inward-retracting core-pulling structure 2 includes a mounting base 25 mounted on a base plate 26, a core pull 23 mounted on the mounting base 25, and a plurality of slider groups distributed circumferentially around the core pull 23. The mounting base 25 is typically made of a high-strength metal, such as alloy steel, and is securely fastened to the base plate 26 by bolts or other means to ensure the stability of the entire inward-retracting core-pulling structure 2. The core pull 23 is generally a columnar structure, and its material can be mold steel, which has good wear resistance and strength.

[0036] Several guide rails are provided around the core pulling 23 to slide with the slider group. The guide rails are tilted and have a T-shaped groove. The tilted upper ends of several guide rails converge toward the center of the core pulling 23, and the tilted lower ends of several guide rails diverge away from the center of the core pulling 23. Different guide rails can adopt different tilt angles, which can be adjusted according to actual processing needs. The slider group and the guide rails are slidably matched through dovetail grooves and other methods to ensure that the slider group can slide smoothly along the guide rails. The outer positions of the tops of several slider groups are all recessed inwardly to provide a groove 4. The shape of the groove 4 can be designed according to the shape of the stop of the workpiece, such as rectangle, trapezoid, etc.

[0037] Specifically, the outward shrinking retaining structure 1 includes a mounting plate 11, an upper die ring 13 fixed below the mounting plate 11, and a plurality of sliding inserts arranged inside the upper die ring 13. The upper die ring 13 is generally made of cast steel and has high strength and rigidity. A conical ring wall 131 that is narrow at the top and wide at the bottom is provided on the inner side of the lower portion of the upper die ring 13. The design of the conical ring wall 131 can convert the vertical downward punching force of the hydraulic press into a radial shrinkage force. A plurality of sliding inserts are circumferentially distributed on the conical ring wall 131. An undercut forming portion 152 is protruding from the inner side of the sliding insert. The undercut forming portion 152 can be integrally formed on the sliding insert by forging or other processes. Its shape and size are determined according to the undercut structure required for the workpiece.

[0038] The sliding inserts can be made of a material with excellent friction-reducing properties, such as bronze, to ensure smooth sliding on the tapered ring wall 131. When stamping a workpiece, the workpiece is sleeved around the outer periphery of the sliders, and the upper die ring 13 is sleeved around the outer periphery of the workpiece's top. By driving the upper die ring 13 vertically downward, the sliding inserts converge inward under the guidance of the tapered ring wall 131, exerting a radial contraction force on the workpiece's top, forcing the sliding inserts into the workpiece. The sliders, guided by the guide rails of the core puller 23, simultaneously move from top to bottom and from inside to outside, completing the workpiece's stopper.

[0039] When several slider groups slide on the guide rails, the inclined design of the guide rails causes the slider groups to move inward and outward while moving up and down. The different inclination angles of the different guide rails ensure that the movement trajectories of the various slider groups do not interfere with each other. Under the action of the conical ring wall 131, the sliding insert cleverly converts the vertical punching force of the hydraulic press into a radial contraction force, thereby securing the workpiece and completing the production of the stop. Through the coordinated cooperation of the inward-retracting core-pulling structure 2 and the outward-retracting retaining structure 1, the mold uses the hydraulic press as the driving source to rationally convert the vertical punching force into the required processing force. Compared with traditional lathe processing methods, its mold installation process is simple and easy to operate, and it can effectively avoid the difficulty of demolding caused by undercutting and adhesion of the workpiece, thereby improving work stability and product consistency. The guide rail design of the inward-retracting core-pulling structure 2 and the movement of the slider group, as well as the coordination between the conical ring wall 131 of the outward-retracting retaining structure 1 and the sliding insert, greatly improve processing efficiency and shorten the production cycle. At the same time, it also ensures the stability of the processing dimensions and reduces processing costs. It is a significant improvement to the existing air spring iron base stop processing technology.

[0040] Reference Figure 4 and Figure 5 In this embodiment, the sliding insert is an arc-shaped pressure ring unit 15. An elastic member is disposed between adjacent pressure ring units 15. The elastic member can be a spring, such as a cylindrical coil spring, and can be made of stainless steel or alloy spring steel. The elastic member is used to drive adjacent pressure ring units 15 away from each other. A hole 151 for accommodating the spring is provided at the end of the pressure ring unit 15. In the initial state, the pressure ring unit 15 is in an open state.

[0041] When the stamping operation is performed, a number of pressure ring units 15 gather inward under the guidance of the conical ring wall 131 and form a closed ring body, so that a ring-shaped closed undercut structure is formed on the outer periphery of the top of the workpiece. At this time, the pressure ring unit 15 overcomes the elastic force of the elastic member and moves inward, fitting tightly together. During demoulding, a number of pressure ring units 15 open and reset under the elastic force of the elastic member, making it convenient to remove the workpiece. By adopting the design of arc-shaped pressure ring units 15 and elastic members, the pressure ring unit 15 can automatically open and close during the stamping and demoulding process without the need for additional complicated operations. The closed ring body is formed during stamping to complete the production of the undercut structure, and reset under the action of the elastic member during demoulding, which further simplifies the operating process and improves work efficiency. At the same time, it can also better ensure the integrity and consistency of the undercut structure. Compared with the traditional method, it has obvious advantages and is an optimization and improvement of the existing mold structure.

[0042] In this embodiment, the outward-retracting retaining structure 1 further includes a stripper plate 12, which is generally made of tool steel with good strength and toughness. A vertical ring wall 132 is provided on the inner side of the top of the upper die ring 13, and the stripper plate 12 is vertically slidably connected to the vertical ring wall 132.

[0043] During demoulding, the bottom of the stripper plate 12 rests against the top of the workpiece, the upper mold ring 13 moves upward, and the plurality of pressure ring units 15 open outward under the elastic force of the elastic member and disengage from the undercut structure of the workpiece. The role of the stripper plate 12 is to limit the workpiece and assist in demoulding during demoulding, thereby preventing the workpiece from adhering to the mold. The addition of the stripper plate 12 further optimizes the demoulding process, making demoulding smoother. It can effectively prevent the workpiece from adhering to the mold due to the undercut structure during demoulding, thereby improving the service life and work efficiency of the mold, ensuring the quality of the product, and further improving the mold structure.

[0044] In this embodiment, a retaining ring 14 is fixedly sleeved around the outer periphery of the upper die ring 13. The retaining ring 14 is secured to the upper die ring 13 via an interference fit or bolt connection. A retaining portion 141 is provided at the bottom of the retaining ring 14. The retaining portion 141 protrudes inward from the inner circumference of the upper die ring 13. When the plurality of compression ring units 15 are opened and reset under the elastic force of the elastic member, the compression ring units 15 abut against the upper surface of the retaining portion 141, thereby limiting the position of the compression ring units 15. The retaining ring 14 and retaining portion 141 can be made of materials such as cast iron, whose hardness and strength meet the required position limits. The size and shape of the retaining portion 141 can be designed based on the size and range of motion of the compression ring units 15 to ensure accurate positioning of the compression ring units 15. The provision of the retaining ring 14 and retaining portion 141 ensures that the compression ring units 15 do not exceed the specified position when opening and resetting, making the entire mold structure more stable and reliable. This avoids the accuracy and stability of the next punching operation being affected by the excessive opening of the pressure ring unit 15, thereby improving the overall performance of the mold and the continuity of work.

[0045] Reference Figure 7-Figure 9 In this embodiment, several slider groups are divided into inner sliders 22 and outer sliders 21 arranged at intervals, and several guide rails are divided into first guide rails 231 and second guide rails 232 with different core pulling angles. The sliding surfaces of the outer slider 21 and the inner slider 22 are both provided with T-shaped slides. The slides of the outer slider 21 slide with the first guide rail 231, and the slides of the inner slider 22 slide with the second guide rail 232. Due to the different core pulling angles of the first guide rail 231 and the second guide rail 232, differential sliding cooperation can be achieved between the inner slider 22 and the outer slider 21, and the inner slider 22 can move up and down synchronously driven by the outer slider 21.

[0046] The pull-out angles of the first and second guide rails 231, 232 are precisely designed based on the actual fit. In this embodiment, the pull-out angles of the first guide rail 231 are 3°, and the pull-out angles of the second guide rail 232 are 6.5°. Because the pull-out angles of the first and second guide rails 231, 232 differ, and the pull-out angle of the second guide rail 232 is greater than that of the first guide rail 231, the retraction speed of the inner slider 22 is greater than that of the outer slider 21. This allows the outer and inner sliders 21, 22, to move synchronously without interfering with each other, forming a differential sliding fit.

[0047] In this embodiment, a vertical sliding sleeve on the outer periphery of the mounting seat 25 is provided with a stripping ring 24, and the stripping ring 24 is provided with a plurality of sliding grooves 241. The plurality of sliding grooves 241 are circumferentially distributed on the top of the stripping ring 24 and extend radially along the stripping ring. The bottom of the plurality of outer sliding blocks 21 is provided with a connecting member 3 that slides with the sliding groove 241. The connecting member 3 can be a structure such as a protrusion or a bolt, and the connection between the outer sliding block 21 and the stripping ring 24 is realized by cooperating with the sliding groove 241.

[0048] The base is provided with a plurality of ejection holes 261, which are located directly below the stripper ring 24. When demolding, the ejection pins that cooperate with the ejection holes 261 pass through the ejection holes 261 and support the stripper ring 24 to achieve the upward movement of the stripper ring 24. The ejection pins can be made of high-strength alloy steel with sufficient strength to lift the stripper ring 24. They can be driven by an electric push rod or by a spring to apply an upward elastic force to achieve the ejection action of the ejection pins. The differential sliding cooperation between the inner slider 22 and the outer slider 21 makes the movement of the slider group more flexible and precise, and can better adapt to the processing requirements of various complex workpieces. The cooperation between the stripper ring 24, the ejection holes 261 and the ejection pins makes the demolding process more automated and efficient. The ejection ring 24 is lifted by the ejection pins, driving the slider group to move upward to achieve separation from the workpiece, avoiding problems such as workpiece back-up and adhesion, and further improving the working efficiency of the mold and product quality.

[0049] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A die for stamping the stopper of an air spring iron base, characterized by: The invention comprises a bottom plate (26), an inward-shrinking core-pulling structure (2) and an outward-shrinking retaining structure (1), wherein the inward-shrinking core-pulling structure (2) comprises a mounting seat (25) arranged on the bottom plate (26), a core-pulling (23) arranged on the mounting seat (25) and a plurality of slider groups circumferentially distributed at the core-pulling (23), wherein a plurality of guide rails slidably matched with the slider groups are arranged on the circumferential side of the core-pulling (23), wherein the guide rails are arranged obliquely, wherein the inclined upper ends of the plurality of guide rails converge toward the center direction of the core-pulling (23), and the inclined lower ends of the plurality of guide rails diverge toward the center direction away from the core-pulling (23), and the outer positions of the tops of the plurality of slider groups are all inwardly recessed and provided with grooves (4); The outward shrinking buckling structure (1) comprises an upper die ring (13) and a plurality of sliding inserts, wherein a tapered ring wall (131) which is narrow at the top and wide at the bottom is provided on the inner side of the lower portion of the upper die ring (13), and the plurality of sliding inserts are circumferentially distributed on the tapered ring wall (131), and an undercut forming portion (152) is provided on the inner side of the sliding insert; When a workpiece is punched, the workpiece is sleeved on the outer periphery of a plurality of sliders, and an upper die ring (13) is sleeved on the outer periphery of the top of the workpiece. By driving the upper die ring (13) to move vertically downward, a plurality of the sliding inserts are gathered inward under the guidance of the conical ring wall (131) to apply a radial contraction force to the top of the workpiece, so that the sliding inserts are fastened into the workpiece. The plurality of the slider groups are simultaneously moved from top to bottom and from inside to outside under the guidance of the core pulling (23) guide rail to complete the production of the workpiece stop.

2. The die for stamping the stopper of the iron base of the air spring according to claim 1, characterized in that: The sliding insert is an arc-shaped pressure ring unit (15), and an elastic member is provided between adjacent pressure ring units (15), and the elastic member is used to drive adjacent pressure ring units (15) away from each other; when performing a stamping operation, a plurality of the pressure ring units (15) gather inward under the guidance of the conical ring wall (131) and form a closed ring body, so that a ring-shaped closed undercut structure is formed on the outer periphery of the top of the workpiece; when demolding, a plurality of the pressure ring units (15) are opened and reset under the elastic force of the elastic member.

3. The die for stamping the stopper of the iron base of the air spring according to claim 2, characterized in that: The outward-retracting retaining structure (1) further comprises a stripping plate (12), a vertical ring wall (132) being provided on the inner side of the top of the upper die ring (13), and the stripping plate (12) being vertically slidably connected to the vertical ring wall (132); when demoulding, the bottom of the stripping plate (12) abuts against the top position of the workpiece, the upper die ring (13) moves upward, and the plurality of pressure ring units (15) are opened outward under the elastic force of the elastic member and are separated from the undercut structure of the workpiece.

4. The die for stamping the stopper of the iron base of the air spring according to claim 2, characterized in that: The upper die ring (13) is fixedly sleeved with a limiting ring (14) on the outer periphery thereof, and a limiting portion (141) is provided at the bottom of the limiting ring (14). The limiting portion (141) protrudes inwardly and is provided on the inner peripheral wall of the upper die ring (13). When the plurality of the pressure ring units (15) are opened and reset under the elastic force of the elastic member, the pressure ring units (15) abut against the upper surface of the limiting portion (141), and the limiting portion (141) plays a limiting role on the pressure ring units (15).

5. The die for stamping the stopper of the iron base of the air spring according to claim 1, characterized in that: Several of the slider groups are divided into inner sliders (22) and outer sliders (21) that are spaced apart, and several of the guide rails are divided into first guide rails (231) and second guide rails (232) with different core pulling angles. The outer slider (21) is in sliding cooperation with the first guide rail (231), and the inner slider (22) is in sliding cooperation with the second guide rail (232). Differential sliding cooperation is performed between the inner slider (22) and the outer slider (21), and the inner slider (22) moves up and down synchronously with the outer slider (22).

6. The die for stamping the stopper of the iron base of the air spring according to claim 5, characterized in that: A stripping ring (24) is provided on the outer periphery of the mounting seat (25). When demoulding, the stripping ring (24) is moved upward to push the outer slider (21). The outer sliders (21) move upward and inward under the guidance of the first guide rail (231), and the inner sliders (22) move upward and inward under the guidance of the second guide rail (232).

7. The die for stamping the stopper of the iron base of the air spring according to claim 6, characterized in that: The base is provided with a plurality of ejecting holes (261), and the plurality of ejecting holes (261) are located directly below the stripping ring (24). When demoulding, an ejecting pin matched with the ejecting hole (261) passes through the ejecting hole (261) and supports the stripping ring (24) to realize the upward movement of the stripping ring (24).

8. The die for stamping the stopper of the iron base of the air spring according to claim 6, characterized in that: The stripping ring (24) is provided with a plurality of slide grooves (241), and the plurality of slide grooves (241) are circumferentially distributed on the top of the stripping ring (24) and extend radially along the stripping ring (24), and the bottoms of the plurality of outer sliding blocks (21) are provided with connecting pieces (3) that slide in cooperation with the slide grooves (241).

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