Modular stamping die for urban rail vehicle maintenance

Abstract

The utility model provides a modularized stamping die for maintenance of urban rail vehicles, which comprises a metal base die, a plurality of stamping dies, a plurality of stamping dies and a plurality of stamping dies. The metal base die is provided with a rectangular groove, and the bottom of the rectangular groove is provided with a plurality of threaded holes. The detachable polyether-ether-ketone pad is fixed in the rectangular groove through a plurality of bolts via the plurality of threaded holes of the metal base mold; and the plurality of magnetic positioning edge strips are embedded in the edge of the metal base mold. According to the modularized stamping die for urban rail vehicle maintenance, rapid die replacement can be achieved, the modularized stamping die is suitable for plates with different thicknesses, and the multi-scene adaptability is greatly improved. In addition, the magnetic positioning edgings are automatically attracted and aligned, and the stamping precision is guaranteed by combining the graduated scale. And only the polyether-ether-ketone pad module is replaced after abrasion, so that the cost is reduced. In addition, the stamping die effectively reduces abrasion and deformation of stamping parts.

Description

TECHNICAL FIELD

[0001] The utility model relates to the metal cold processing technical field related to the manufacture, maintenance etc. of city rail vehicles, specifically, a modular stamping die for city rail vehicle maintenance. The die is mainly used for stamping processing of various metal plates during city rail vehicle maintenance, which can effectively improve the stamping efficiency, ensure the stamping quality and reduce the maintenance cost. BACKGROUND

[0002] During the long-term operation of city rail vehicles, the parts of the vehicles will inevitably be damaged, such as the deformation and damage of metal parts such as doors and body panels. In order to restore the normal use function of these damaged parts, stamping repair or re-manufacturing is often required. However, the existing stamping die has the following problems in the application of city rail vehicle maintenance.

[0003] City rail vehicle maintenance involves a variety of different thicknesses of metal plates, from thin plates to thick plates, with a large range of thicknesses. Traditional stamping dies are usually designed and manufactured for specific thicknesses of plates, and the structure and parameters of the die are relatively fixed. When different thicknesses of plates need to be processed, the entire die needs to be replaced, which not only increases the cost of purchasing the die, but also causes the maintenance work to stop, affecting the efficiency of maintenance.

[0004] In addition, during the stamping process, accurate positioning of the plate is crucial to ensure the quality of stamping. The existing stamping die has deficiencies in positioning, and many dies rely on external auxiliary positioning tools such as positioning clamps and positioning pins. These positioning methods are not only cumbersome to operate, but also susceptible to human factors and external environmental influences, resulting in low positioning accuracy. In city rail vehicle maintenance, for some high-precision stamping parts such as the lock catch mounting hole of the door and the connection part of the body, insufficient positioning accuracy may result in inaccurate installation of the stamping parts, affecting the overall performance and safety of the vehicle.

[0005] On the other hand, stamping dies will wear out during long-term use, especially the parts that directly contact the plates. The structural design of traditional dies makes it difficult to repair them locally, and often requires the entire die to be replaced, which undoubtedly increases the maintenance cost of the die.

[0006] In addition, during the stamping process, direct contact between the die and the plate can cause scratches and deformation on the surface of the plate. For the appearance parts of city rail vehicles such as body panels and doors, the surface quality directly affects the overall appearance and market competitiveness of the vehicle. The existing stamping die has certain limitations in protecting the surface quality of the stamping parts, and cannot meet the demand for high-quality stamping parts in city rail vehicle maintenance.

[0007] In summary, the existing stamping die can not well adapt to the actual needs of the urban rail vehicle maintenance, and it is of great practical significance to develop a new type of stamping die suitable for urban rail vehicle maintenance. Utility model content

[0008] The existing stamping die for urban rail vehicle maintenance has poor adaptability, is difficult to cope with various part specifications, has low positioning accuracy, affects the quality of stamped parts, has short die life, increases cost, and is easy to scratch the surface of the stamped part. A new type of stamping die is urgently needed to solve these problems and improve maintenance efficiency and quality. The die of the utility model has strong adaptability, can quickly replace the polyether ether ketone pad to adapt to different plate materials, the magnetic edge strip is accurately positioned with small deviation, the polyether ether ketone pad is wear-resistant, prolonging the service life of the die, the surface grid texture reduces the scratching and deformation of the stamped part, reduces maintenance cost, and improves maintenance efficiency and the quality of the stamped part.

[0009] Specifically, according to the technical scheme of the utility model, a modular stamping die for urban rail vehicle maintenance is provided, comprising:

[0010] A metal base die has a rectangular groove and a plurality of threaded holes at the bottom of the rectangular groove;

[0011] A detachable polyether ether ketone pad is fixed in the rectangular groove through a plurality of threaded holes of the metal base die; and

[0012] A plurality of magnetic positioning edge strips are embedded in the edge of the metal base die. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 A side perspective view of a modular stamping die for urban rail vehicle maintenance using a metal base punch according to one specific embodiment of the utility model is shown;

[0014] Figure 2 A schematic view of a modular stamping die for urban rail vehicle maintenance using a metal base punch according to Figure 1 is shown from the side of the rectangular groove (for clear representation, the detachable polyether ether ketone pad is omitted);

[0015] Figure 3 is a cross-sectional schematic view of a detachable polyether ether ketone pad according to one specific embodiment of the utility model;

[0016] Figure 4 A side perspective view of a modular stamping die for urban rail vehicle maintenance using a metal base punch according to one specific embodiment of the utility model is shown;

[0017] Figure 5A side view of a modular stamping die for metro vehicle repair is shown, which comprises a metal-based punch and a metal-based die, and a plate to be stamped is placed between the metal-based punch and the metal-based die. DETAILED DESCRIPTION

[0018] The utility model will be further described in detail below in combination with the drawings and specific embodiments. It will be understood that other embodiments are considered and can be implemented without departing from the scope or spirit of the utility model. Therefore, the following detailed description is non-limiting.

[0019] Unless otherwise indicated, all numbers expressing features, quantities and physical characteristics in the specification and claims are to be understood as being modified in all instances by the term "about". Accordingly, unless otherwise indicated, the numerical parameters set forth in the specification and the claims are approximations that can vary depending upon the desired properties sought to be obtained by the teachings disclosed herein. At the very least, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Numerical ranges include all numbers and ranges between the numbers, inclusive of those numbers.

[0020] As described above, in view of the poor adaptability, low positioning accuracy, short die life and great impact on the surface quality of the stamped part of the existing stamping die in metro vehicle repair, the utility model has developed a modular stamping die for metro vehicle repair. The die adopts innovative designs such as detachable polyether ether ketone pads and magnetic positioning strips, aiming to improve the versatility, positioning accuracy and service life of the die, and reduce the impact on the surface quality of the stamped part.

[0021] Specifically, the utility model provides a modular stamping die for metro vehicle repair, comprising:

[0022] A metal-based die having a rectangular groove and a plurality of threaded holes at the bottom of the rectangular groove;

[0023] A detachable polyether ether ketone pad fixed in the rectangular groove through the plurality of threaded holes of the metal-based die by a plurality of bolts; and

[0024] A plurality of magnetic positioning strips embedded in the edges of the metal-based die.

[0025] Figure 1 A side perspective view of a modular stamping die 100 for metro vehicle repair using a metal-based punch 1 according to one specific embodiment of the utility model is shown. Figure 2 A side perspective view of a modular stamping die 100 for metro vehicle repair using a metal-based punch 1 according to one specific embodiment of the utility model is shown.Figure 1 is a schematic view of a modular stamping die 100 for a metro vehicle repair using a metal-based punch 1, viewed from the side of the rectangular recess 2 (for the sake of clarity in representing the configuration of the metal-based punch, the detachable polyether ether ketone pad is omitted). Figure 3 is a schematic view of a cross section of the detachable polyether ether ketone pad 3 according to one specific embodiment of the present application.

[0026] In particular, as shown in Figures 1-3 , the modular stamping die 100 for a metro vehicle repair comprises a metal-based punch 1 having a rectangular recess 2 and a plurality of threaded holes 4 at the bottom of the rectangular recess 2, a detachable polyether ether ketone pad 3 fixed in the rectangular recess 2 through the plurality of threaded holes 4 of the metal-based punch 1 by a plurality of bolts 5, and a plurality of magnetic positioning edges 6 embedded in the edges of the metal-based punch 1.

[0027] In addition, as shown in Figure 3 , the detachable polyether ether ketone pad 3 comprises a polyether ether ketone engineering material pad 7 and a metal bottom plate 8 having threaded holes 4 thereon, which are stacked on each other.

[0028] Preferably, the thickness of the detachable polyether ether ketone pad is in the range of 5mm to 20mm, preferably 5-15mm. The thickness of the detachable polyether ether ketone pad is set in the range of 5mm to 20mm as a result of comprehensive consideration of various factors. When the thickness is in this interval, it can not only ensure that the polyether ether ketone engineering material pad has enough material to exert its excellent performance, such as resisting the reaction force of the plate during stamping, reducing its own deformation, and ensuring the dimensional accuracy of the stamped part, but also take into account the compactness of the overall structure of the die and the adaptability to different plates. And the preferred thickness range is set to 5-15mm, because in this range, the detachable polyether ether ketone pad can better balance the weight, cost and stability of the die while meeting various performance requirements. For example, when stamping thinner plates, a pad body with a thickness of 5-15mm can provide appropriate cushioning and support to avoid excessive extrusion of the plate; when stamping thicker plates, a pad body with this thickness range can also withstand the corresponding pressure to ensure smooth stamping. Optionally, in order to realize installation by bolts, the detachable polyether ether ketone pad can have through holes corresponding to the threaded holes.

[0029] Figure 4 shows a side perspective view of a modular stamping die 200 for a metro vehicle repair using a metal-based punch 1 according to another specific embodiment of the present application.

[0030] Figure 5A side view of a modular stamping die for a metro vehicle repair is shown, which simultaneously uses a metal-based punch 1 and a metal-based die 9, and a plate 10 to be stamped is placed between the metal-based punch 1 and the metal-based die 9.

[0031] Specifically, the metal-based die is the core support component of the die, which has a rectangular groove design. The shape and size of this groove are designed to provide mounting positions for the detachable polyether ether ketone pad, ensuring a tight fit between the two and preventing relative displacement during stamping, ensuring stamping accuracy. The evenly distributed multiple threaded holes at the bottom of the groove are used in conjunction with bolts to securely fix the polyether ether ketone pad on the metal-based die. This design not only ensures the stability of the connection, but also facilitates disassembly when the polyether ether ketone pad needs to be replaced, improving the maintenance convenience of the die.

[0032] Preferably, the metal-based die is made of high-strength, high-toughness and good wear-resistant metal materials, such as a specific type of die steel. After special heat treatment process, this kind of steel can withstand the huge pressure and impact force in the stamping process, and is not easy to deform, crack and other damage, so as to ensure the stability and reliability of the die in the long-term use process. For example, the die steel used achieves a good balance between hardness, strength and toughness, its Rockwell hardness reaches a certain range, and the tensile strength and yield strength also meet the design requirements, ensuring that the metal-based die can operate stably under complex stamping conditions.

[0033] According to some preferred technical solutions of the present application, a guide slope is arranged at the corner of the rectangular groove of the metal-based die, which matches the chamfer of the detachable polyether ether ketone pad. When installing the polyether ether ketone pad, the guide slope can play a guiding role, making the installation process more smooth and accurate. The operator can more easily align the polyether ether ketone pad with the rectangular groove for installation, reducing installation time, while improving installation accuracy and avoiding performance degradation of the die due to installation deviation.

[0034] According to certain preferred technical schemes of the utility model, the detachable polyether ether ketone pad is composed of a polyether ether ketone engineering material pad and a metal bottom plate. Polyether ether ketone (PEEK) is a kind of high-performance special engineering plastic, and it has excellent comprehensive performance. Its melting point is as high as 343 DEG C, and the glass transition temperature is about 143 DEG C, which makes it still maintain good mechanical properties in high-temperature environment, and even if a certain heat is generated due to friction in the stamping process, softening, deformation and other problems do not occur, ensuring the precision and stability of the mould. PEEK has high tensile strength and bending strength, which can effectively resist the reaction force of the plate in the stamping process, reduce its deformation, and ensure the dimensional accuracy of the stamped part. Compared with traditional polyurethane materials, PEEK has smaller deformation under the same pressure, and can better meet the processing requirements of high-precision stamped parts in urban rail vehicle maintenance. There are PEEK plates of different thickness specifications on the market, such as plates with thickness of 5-20mm, to meet the requirements of different mould designs for the thickness of the polyether ether ketone pad. For example, related products of Jiangsu Junhua Special Engineering Plastic Products Co., Ltd. and Wuxi Shunxuan New Material Co., Ltd.

[0035] In addition, the stamping operation in urban rail vehicle maintenance often needs to process metal plates of various materials and surface conditions, and the friction between the mould and the plate is inevitable. PEEK material has excellent wear resistance, and its wear resistance is several times higher than that of ordinary engineering plastics, which can effectively reduce the wear of the mould during use and prolong the service life of the mould. For example, after multiple stamping of the metal plate with rough surface, the wear degree of the polyether ether ketone pad is significantly smaller than that of the traditional mould material, reducing the replacement frequency of the mould and saving the maintenance cost. In addition, the self-lubricating property of PEEK reduces the friction between the metal plate and the plate during stamping. This not only helps to improve the surface quality of the stamped part and reduce surface scratches and scratches, but also reduces the pressure required for stamping, reduces energy consumption and improves stamping efficiency.

[0036] Preferably, the metal bottom plate and the polyether ether ketone engineering material pad are tightly combined by vulcanization bonding. The thickness of the metal bottom plate is controlled within the range of 2-5mm, which can ensure that the metal bottom plate has sufficient strength and rigidity to provide stable support for the polyether ether ketone engineering material pad, and will not increase the overall weight and cost of the mould due to excessive thickness. The metal bottom plate is provided with mounting holes corresponding to the threaded holes of the metal base mould, and the detachable polyether ether ketone pad is fixed on the metal base mould by bolts.

[0037] According to certain preferred technical schemes of the utility model, the surface of the detachable polyether ether ketone pad has a grid texture, the depth of the grid texture is 0.5-1mm, the grid density is 5*5mm, and it is a square grid with an error of less than ±0.1mm. This grid texture design has multiple effects:

[0038] Increased friction: During stamping, the grid texture can increase the friction between the polyether ether ketone pad and the metal sheet, effectively preventing the sheet from shifting during stamping, ensuring the dimensional accuracy of the stamped part.

[0039] Dispersing pressure: During stamping, the grid texture can evenly distribute pressure to the entire contact surface, avoiding local excessive pressure that may damage the sheet, reducing surface deformation and scratches of the stamped part. When stamping high-strength metal sheets, the grid texture effectively disperses the pressure, significantly improving the surface quality of the stamped part.

[0040] Buffering effect: The presence of the grid texture allows the polyether ether ketone pad to have a certain elastic deformation space, which can play a buffering role at the moment of stamping, reducing the impact of stamping on the sheet, and further protecting the surface quality of the stamped part.

[0041] Preferably, the plurality of magnetic positioning edges are embedded in the edge of the metal matrix, and neodymium iron boron magnets are used as the magnetic material. Neodymium iron boron magnets have extremely high magnetism and can generate a strong magnetic field, rapidly attracting the metal sheet commonly used in urban rail vehicle maintenance within a short time, automatically aligning it to achieve fast and accurate positioning. Compared with the traditional method of relying on external auxiliary positioning tools, the magnetic positioning edge has faster positioning speed and higher positioning accuracy. The traditional positioning method is greatly affected by human factors, and the positioning error may be several millimeters or even larger, while the magnetic positioning edge can control the positioning deviation within a very small range, greatly improving the production efficiency and quality of the stamped part.

[0042] According to some preferred technical solutions of the present utility model, the outer side of the magnetic positioning edge is provided with a scale ruler, and the accuracy of the scale ruler reaches 0.1mm. The operator can fine-tune the stamping position of the sheet according to the scale ruler, further improving the accuracy of positioning. In actual operation, for some stamped parts with extremely high position accuracy requirements, such as the stamping of door lock mounting holes, the operator can accurately adjust the position of the sheet by observing the scale ruler, ensuring that the hole position accuracy of the stamped part meets the design requirements, effectively avoiding the scrapping of the stamped part due to inaccurate positioning.

[0043] Preferably, the surface of the magnetic positioning edge is covered with a polytetrafluoroethylene coating with a thickness of 20-30μm. Polytetrafluoroethylene has good wear resistance and self-lubricating properties, which can protect the surface of the magnetic positioning edge from damage and prolong its service life. During long-term use, even if the metal sheet is in frequent contact and friction with the magnetic positioning edge, the polytetrafluoroethylene coating can effectively reduce the wear of the magnetic positioning edge and maintain its good performance. At the same time, the self-lubricating property makes the sheet more easily slide during positioning and stamping, further improving the convenience of operation and the efficiency of stamping.

[0044] According to some preferred technical solutions of the utility model, the width of the magnetic positioning edge strip is designed to be 20-30mm, which can ensure that the magnetic positioning edge strip has sufficient magnetic strength and will not affect the overall structure and operation space of the mold due to excessive width. The height thereof is adapted to the edge height of the metal base mold, ensuring that it is flush with the surface of the metal base mold after installation and does not affect the normal use of the mold, while ensuring sufficient contact between the magnetic positioning edge strip and the metal plate and improving the positioning effect.

[0045] When facing different specifications of urban rail vehicle parts, the traditional stamping mold needs to replace the entire mold, which is tedious and time-consuming. However, the mold of the utility model can complete the replacement in a short time by adopting the design of detachable polyether ether ketone pad. For example, when repairing doors of different vehicle models, it may take several hours or even longer to replace the traditional mold, but the operation of replacing the polyether ether ketone pad can be completed within ten minutes using the mold of the utility model, greatly shortening the mold replacement time and improving the repair efficiency.

[0046] In addition, the mold of the utility model can adapt to the stamping processing needs of various metal plates from thin plates to thick plates. The hardness of the polyether ether ketone pad is in the range of 70A-90A, which has good elasticity and buffering performance. Whether it is fine stamping of thinner plates or forming of thicker plates with greater pressure, the quality of the stamped parts can be guaranteed.

[0047] The application of the magnetic positioning edge strip makes the positioning of the plate more intelligent and efficient. When the metal plate is placed on the mold, the strong magnetic field generated by the neodymium iron boron magnet can quickly attract the plate, making it automatically aligned, greatly reducing the time and error of manual positioning. This automatic adsorption alignment method not only improves production efficiency, but also ensures the accuracy and consistency of each positioning.

[0048] Combined with the design of the scale ruler, the operator can accurately fine-tune the stamping position of the plate. The minimum scale of the scale ruler is 0.1mm, which can meet the positioning requirements of high-precision stamped parts in urban rail vehicle maintenance. For example, when stamping parts at the connection position of the vehicle body, the positioning deviation of the plate can be controlled within a very small range with the assistance of the scale ruler, ensuring that the stamped parts can be accurately installed, improving the overall performance and safety of the vehicle.

[0049] According to certain preferred technical solutions of this utility model, the surface grid texture and good elasticity of the polyetheretherketone (PEEK) pad can effectively reduce scratches and deformations on the sheet metal surface during stamping. The pressure-dispersing effect of the grid texture and the cushioning performance of the PEEK pad result in a smoother and flatter surface for the stamped parts, significantly improving surface quality. Actual production verification shows that stamped parts produced using the mold of this utility model exhibit a 90% reduction in surface scratches and deformation, meeting the stringent surface quality requirements for urban rail vehicle exterior components.

[0050] Precise positioning and stable mold performance ensure the dimensional and shape accuracy of stamped parts, improving product quality stability. In urban rail vehicle maintenance, high-quality stamped parts ensure interchangeability and assembly precision, reducing vehicle malfunctions caused by component quality issues and improving the operational reliability of urban rail vehicles.

[0051] exist Figure 5 In the actual operation of the modular composite stamping die for urban rail vehicle maintenance, a suitable removable polyetheretherketone (PEEK) pad is selected according to the specific requirements of the sheet metal to be stamped. The PEEK pad is installed in the rectangular grooves of the metal-based punch and die using bolts, ensuring the bolts are tightened and the PEEK pad is securely fixed. Then, the sheet metal to be stamped is placed on top of the die. The magnetic positioning strips on the edges of the metal-based punch and die quickly attract the sheet metal, automatically aligning it. The operator observes the scale on the magnetic positioning strips and makes fine adjustments to the sheet metal's position to ensure accurate stamping. After the sheet metal is positioned, the stamping equipment is started. The stamping equipment drives the metal-based punch downwards, cooperating with the metal-based die to apply pressure to the sheet metal for stamping. During the stamping process, the removable PEEK pad plays a buffering and protective role. Its surface grid texture increases friction with the sheet metal, preventing displacement and dispersing pressure to reduce damage to the sheet metal surface. Magnetic positioning strips continuously and stably fix the sheet metal, ensuring its position remains unchanged during stamping and guaranteeing that the dimensional and shape accuracy of the stamped parts meets requirements. After stamping, the stamping equipment raises and resets the metal-based punch. The stamped parts are then removed and subjected to quality inspection, including checks on dimensional accuracy, shape accuracy, and surface quality.

[0052] This utility model of modular stamping die for urban rail vehicle maintenance is widely used in all aspects of urban rail vehicle maintenance. In door maintenance, it can precisely stamp out door lock mounting holes, hinge mounting parts, and other components that meet specifications, ensuring the normal use of the doors. In body panel maintenance, it can repair deformed panels through stamping, ensuring the overall appearance and structural strength of the vehicle body. For the maintenance of critical components such as the frame, the high-precision positioning and stability of the die ensure that the stamped parts perfectly match the original parts, ensuring the safety and reliability of the vehicle.

[0053] The following list of embodiments further illustrates various exemplary embodiments of the present invention, which should not be construed as unduly limiting the present invention:

[0054] Specific implementation plan 1 is a modular stamping die for urban rail vehicle maintenance, including:

[0055] A metal base mold having a rectangular groove and multiple threaded holes at the bottom of the rectangular groove;

[0056] A removable polyetheretherketone (PEEK) pad, wherein the removable PEEK pad is secured to the rectangular groove by a plurality of bolts through the plurality of threaded holes in the metal base mold; and

[0057] Multiple magnetic positioning strips are embedded in the edge of the metal base mold.

[0058] Specific implementation scheme 2 is a modular composite stamping die for urban rail vehicle maintenance as described in specific implementation scheme 1, characterized in that the metal base die is a metal base punch and / or a metal base die.

[0059] Specific implementation scheme 3 is a modular composite stamping die for urban rail vehicle maintenance as described in specific implementation scheme 1, characterized in that the metal base die includes a metal base punch and a metal base die.

[0060] Specific implementation scheme 4 is based on the modular composite stamping die for urban rail vehicle maintenance described in specific implementation scheme 1, characterized in that the detachable polyetheretherketone pad includes a polyetheretherketone engineering material pad and a metal base plate stacked on top of each other.

[0061] Specific implementation scheme 5 is a modular composite stamping die for urban rail vehicle maintenance as described in specific implementation scheme 4, characterized in that the thickness of the metal base plate is in the range of 2-5 mm, and the metal base plate is vulcanized and bonded to the polyether ether ketone engineering material pad.

[0062] Specific implementation scheme 6 is based on the modular composite stamping die for urban rail vehicle maintenance described in specific implementation scheme 1, characterized in that the plurality of magnetic positioning strips are neodymium iron boron magnet positioning strips.

[0063] Specific implementation scheme 7 is a modular composite stamping die for urban rail vehicle maintenance as described in specific implementation scheme 1, characterized in that the surface of the detachable polyether ether ketone pad has a grid texture, the depth of the grid texture is 0.5-1mm, and the grid density is 5×5mm.

[0064] Specific implementation 8 is the modular composite stamping die for urban rail vehicle maintenance according to specific implementation 7, characterized in that the grid texture of the detachable polyether ether ketone pad is a square grid, and the edge length error of the grid is controlled within ±0.1 mm.

[0065] Specific implementation 9 is the modular composite stamping die for urban rail vehicle maintenance according to specific implementation 1, characterized in that the corner of the rectangular groove of the metal base mold is provided with a guide inclined surface matched with the chamfer of the detachable polyether ether ketone pad.

[0066] Specific implementation 10 is the modular composite stamping die for urban rail vehicle maintenance according to specific implementation 1, characterized in that the hardness of the detachable polyether ether ketone pad is in the range of 70A-90A, and the pad has good elasticity and buffering performance.

[0067] Specific implementation 11 is the modular composite stamping die for urban rail vehicle maintenance according to specific implementation 1, characterized in that the surface of the plurality of magnetic positioning edge strips has a polytetrafluoroethylene coating with a thickness of 20-30 μm, and the surface has good wear resistance and self-lubricating property.

[0068] Specific implementation 12 is the modular composite stamping die for urban rail vehicle maintenance according to specific implementation 1, characterized in that the width of the plurality of magnetic positioning edge strips is 20-30 mm, and the height is matched with the edge height of the metal base mold.

[0069] Specific implementation 13 is the modular composite stamping die for urban rail vehicle maintenance according to specific implementation 1, characterized in that the thickness of the detachable polyether ether ketone pad is in the range of 5 mm to 20 mm, preferably 5-15 mm.

[0070] Compared with the stamping die in the prior art, the modular composite stamping die for urban rail vehicle maintenance according to the utility model has the advantages that:

[0071] 1. The conventional stamping die is usually designed for a specific specification of plate, and has poor universality. When facing different thickness and shape of urban rail vehicle parts, the die usually needs to be re-manufactured, which is costly and time-consuming. The die of the utility model can quickly replace the pad body suitable for different plates through the modular design of the detachable polyether ether ketone pad, so that one set of die can process multiple specifications of plates, and the universality and use flexibility of the die are improved.

[0072] 2. The existing stamping die mostly relies on external auxiliary positioning tool, the operation is complex and the positioning precision is influenced by many factors. In comparison, the utility model adopts the positioning mode of magnetic positioning edge strip combined with scale ruler, realizes automatic adsorption alignment and accurate fine adjustment of plate material, the positioning deviation can be controlled in a very small range, effectively improves the precision and quality of stamping part, reduces the scrap rate, and improves the production efficiency.

[0073] 3. The traditional die usually needs to be replaced as a whole after wear, and the maintenance cost is high. The die of the utility model can be disassembled and replaced with the pad made of wear-resistant polyether ether ketone material, and only the pad needs to be replaced after wear, which greatly reduces the maintenance cost of the die. At the same time, the long service life of the polyether ether ketone pad also prolongs the overall service life of the die, reduces the frequency of die replacement, and improves the continuity of production.

[0074] 4. The traditional die is easy to cause scratches and deformation on the surface of the plate during stamping, which affects the appearance and performance of the product. The utility model effectively reduces the surface damage of the stamping part through the grid texture design and good elastic buffer performance of the polyether ether ketone pad, improves the surface quality, and meets the demand of urban rail vehicle appearance parts for high-quality stamping parts.

[0075] Obviously, those skilled in the art can make various modifications and variations to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure belong to the scope of the claims of the utility model and its equivalent technologies, the present disclosure also intends to include these modifications and variations.

Claims

1. A modular stamping die for urban rail vehicle maintenance, characterized in that, include: A metal base mold having a rectangular groove and multiple threaded holes at the bottom of the rectangular groove; A removable polyetheretherketone (PEEK) pad, wherein the removable PEEK pad is secured to the rectangular groove by a plurality of bolts through the plurality of threaded holes of the metal base mold, and the thickness of the removable PEEK pad is in the range of 5 mm to 20 mm; and Multiple magnetic positioning strips are embedded in the edge of the metal base mold.

2. The modular stamping die for urban rail vehicle maintenance according to claim 1, characterized in that, The metal base mold is a metal base punch and / or a metal base die.

3. The modular stamping die for urban rail vehicle maintenance according to claim 1, characterized in that, The metal base mold includes a metal base punch and a metal base die.

4. The modular stamping die for urban rail vehicle maintenance according to claim 1, characterized in that, The removable polyetheretherketone (PEEK) pad comprises a polyetheretherketone engineering material pad and a metal base plate stacked on top of each other.

5. The modular stamping die for urban rail vehicle maintenance according to claim 4, characterized in that, The thickness of the metal base plate is in the range of 2-5 mm, and the metal base plate is vulcanized and bonded to the polyetheretherketone engineering material pad.

6. The modular stamping die for urban rail vehicle maintenance according to claim 1, characterized in that, The plurality of magnetic positioning strips are neodymium iron boron magnet positioning strips.

7. The modular stamping die for urban rail vehicle maintenance according to claim 1, characterized in that, The surface of the removable polyetheretherketone (PEEK) pad has a grid texture.

8. The modular stamping die for urban rail vehicle maintenance according to claim 1, characterized in that, The corner of the rectangular groove of the metal base mold is provided with a guide bevel, which matches the chamfer of the removable polyether ether ketone pad.

9. The modular stamping die for urban rail vehicle maintenance according to claim 1, characterized in that, The width of the plurality of magnetic positioning strips is 20-30 mm, and the height is adapted to the edge height of the metal base mold.

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