Die forging device for central hole punching and window die forging in hub forging

Abstract

The utility model discloses a central hole and window die forging die device for forging a hub, and belongs to the technical field of die forging die devices. The device comprises an upper die structure and a lower die structure, the upper die structure is located above the lower die structure, the front face of a forging stock corresponds to the upper die structure, and the back face of the forging stock corresponds to the lower die structure; the upper die structure comprises an upper large plate, a center punch and a window punch. The upper large plate is used for driving the central punch and the window punch to move; the lower die structure comprises a lower large plate and a lower die base shell. The lower large plate is used for supporting the lower die holder shell, and the lower die holder shell is used for fixing a forging stock; the lower die base shell comprises a lower die center hole and a lower die window hole, the lower die center hole corresponds to the center punch, the lower die center hole is used for allowing center waste materials after stamping forging to pass through, the lower die window hole corresponds to the window punch, and the lower die window hole is used for allowing window waste materials after stamping forging to pass through. According to the device, the back of the forging stock with a simple structure is placed on the lower die structure, so that the demolding difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of forging die devices, and in particular to a forging die device for punching a center hole and window in a forged wheel hub. Background Technology

[0002] During the production of forged wheels, a punching operation is required to form the center hole and window of the wheel. The center hole is used to connect the wheel and the axle and to support the vehicle. The window is the space between the spokes on the front of the wheel, used for aesthetic purposes or to achieve wheel weight reduction.

[0003] In related technologies, the forged blank of a wheel is placed face down on a lower die for punching. However, in these technologies, the face shape of the forged blank is complex, making demolding difficult. Therefore, a device is urgently needed to solve the above problems. Summary of the Invention

[0004] This utility model provides a forging die device for punching a center hole and window in a forged wheel hub, to solve the above-mentioned problems. The technical solution is as follows:

[0005] On the one hand, a forging die device for punching center holes and windows in forged wheel hubs is provided. The forging die device for punching center holes and windows in forged wheel hubs includes: an upper die structure and a lower die structure. The upper die structure is located above the lower die structure. The front side of the forged blank corresponds to the upper die structure, and the back side of the forged blank corresponds to the lower die structure.

[0006] The upper mold structure includes an upper plate, a center punch, and a window punch;

[0007] The upper plate is used to drive the center punch and the window punch to move. The center punch is used to punch the center hole, and the window punch is used to punch the window.

[0008] The lower mold structure includes a lower large plate and a lower mold base housing;

[0009] The lower plate is used to support the lower die holder housing, and the lower die holder housing is used to fix the reverse side of the forging billet;

[0010] The lower die housing includes a lower die center hole and a lower die window hole. The lower die center hole corresponds to the center punch. The lower die center hole is used for the passage of center scrap after forging. The lower die window hole corresponds to the window punch. The lower die window hole is used for the passage of window scrap after forging.

[0011] Optionally, the upper die structure further includes: an upper die pressure plate; the upper die pressure plate includes a through hole for the center punch and the window punch to pass through; the upper die pressure plate is connected to the upper large plate by a first bolt and a first nut, and the upper die pressure plate is used to fix the front side of the forging blank; and a spring is provided between the upper die pressure plate and the upper large plate, the spring being used to drive the upper die pressure plate to spring open towards the forging blank when the upper die structure moves upward, so that the punched forging blank is separated from the center punch and the window punch.

[0012] Optionally, the lower die housing includes a cavity for the forging center scrap and the forging window scrap to fall through.

[0013] Optionally, the lower die structure further includes: a scrap sloping slide, the scrap sloping slide being located in the cavity, and the first end of the scrap sloping slide being connected to the inner wall of the lower die housing through an inner wall welding point; the second end of the lower die housing near the scrap sloping slide further includes a scrap discharge channel, the first end being higher than the second end; the scrap discharge channel is used to discharge the forging center scrap and the forging window scrap that slide down along the scrap sloping slide.

[0014] Optionally, the lower profile of the upper die plate is a three-dimensional shape obtained by Boolean operation on the forming surface of the front side of the forging blank, and the upper profile of the lower die housing is a three-dimensional shape obtained by Boolean operation on the forming surface of the back side of the forging blank.

[0015] Optionally, the structure of the center punch, the structure of the window punch, the number of window punches, and the arrangement of the window punches are determined based on the reference structure of the forging blank.

[0016] Optionally, the side of the upper plate away from the forging blank includes an upper die positioning pin hole and an upper die center positioning groove, the upper die positioning pin hole and the upper die center positioning groove being used to position the upper die structure; the side of the lower plate away from the forging blank includes a lower die positioning pin hole and a lower die center positioning groove, the lower die positioning pin hole and the lower die center positioning groove being used to position the lower die structure.

[0017] Optionally, the upper plate further includes an upper die lifting hole on the side away from the forging blank and an upper die side lifting lug on the side; the upper die lifting hole and the upper die side lifting lug are used to lift the upper die structure; the lower plate further includes a lower die lifting hole on the side away from the forging blank and a lower die side lifting lug on the side; the lower die lifting hole and the lower die side lifting lug are used to lift the lower die structure.

[0018] Optionally, the forging die device for punching the center hole and window of the forged wheel hub further includes a loading and unloading structure; the loading and unloading structure is used to move the forging billet.

[0019] Optionally, the forging die device for punching the center hole and window of the forged wheel hub is used to punch holes in the forged blank after the wheel rim has been spun.

[0020] The technical solution provided by this utility model brings at least the following beneficial effects:

[0021] The technical solution provided by this utility model makes demolding easier by placing the back of the forging billet, which has a simpler structure than the front of the forging billet, on the lower die structure. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a forging die device for punching a center hole and window in a forged wheel hub, as proposed in this utility model.

[0024] Figure 2 This is a schematic diagram of the structure of a lower plate, a waste inclined slide, and a waste discharge channel proposed in this utility model;

[0025] Figure 3 This is a schematic diagram of the layout structure of the center punch and the window punch proposed in this utility model;

[0026] Figure 4 This is a schematic diagram of another layout structure of the center punch and window punch proposed in this utility model;

[0027] Figure 5 This is a schematic diagram of the operating state of a forging die device for punching a center hole and window in a forged wheel hub, as proposed in this utility model.

[0028] Figure reference numerals: 1. Upper plate, 2 and 9. 3. Upper die lifting hole, 4. Second bolt, 6. Third bolt, 5. Upper die positioning pin hole, 7. Upper die center positioning groove, 8. Inner wall welding point, 10. Upper die side lifting lug, 11. Spring, 12. Upper die pressure plate, 13. Forging billet, 14. Window punch, 15. Center punch, 16. Lower die base housing, 17. Fourth bolt, 18. Lower die side lifting lug, 19. Lower die positioning pin hole, 20. Lower die center positioning groove, 21. Lower die lifting hole, 22. Lower plate, 23. Scrap material sloping slide, 24. Scrap material discharge channel, 25. Center scrap after forging, 26. Window scrap after forging, 27. First nut, 28. Robot arm, 29. Lower die center hole, 30. Lower die window hole. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be described in further detail below with reference to the accompanying drawings.

[0030] It should be noted that the terms "first," "second," etc. (if applicable) in the specification of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of utility models consistent with some aspects of this application.

[0031] Punching is a crucial step in the production of forged wheels (also known as wheel hubs). The purpose of punching is to create a center hole and a window on the wheel. The center hole connects the wheel to the axle, supporting the vehicle; while the window is the space between the spokes on the front of the wheel, serving not only an aesthetic purpose but also contributing to wheel weight reduction. In existing technology, the forging blank (or billet, i.e., the unfinished product in the die forging process) is placed face down on the lower die for punching. However, the complex shape of the forging blank, especially the window area, makes demolding very difficult. During punching, the complex shape can easily interfere with the die, leading to die damage or forging blank deformation. Furthermore, the difficulty in demolding increases production costs and reduces production efficiency.

[0032] Therefore, see Figure 1 The diagram shows a structural schematic of a forging die device for punching a center hole and a window in a forged wheel hub, which facilitates the demolding of the forged billet after punching. The forging die device for punching the center hole and window of the forged wheel hub includes an upper die structure and a lower die structure. The upper die structure is located above the lower die structure. The front of the forged blank 13 corresponds to the upper die structure, and the back of the forged blank 13 corresponds to the lower die structure. The upper die structure includes an upper plate 1, a center punch 15, and a window punch 14. The upper plate 1 is used to drive the center punch 15 and the window punch 14 to move. The center punch 15 is used to punch the center hole, and the window punch 14 is used to punch the window. The lower die structure includes a lower plate 22 and a lower die base housing 16. The lower plate 22 is used to support the lower die base housing 16, and the lower die base housing 16 is used to fix the back of the forged blank 13. The lower die base housing 16 includes a lower die center hole 29 and a lower die window hole 30. The lower die center hole 29 corresponds to the center punch 15 and is used for the passage of the center scrap 25 after punching. The lower die window hole 30 corresponds to the window punch 14 and is used for the passage of the window scrap 26 after punching.

[0033] This device is a mold device specifically designed for the punching operation in the production process of forged wheels (hubs). It consists of two parts: an upper mold structure and a lower mold structure. The upper mold structure is located above the lower mold structure, and the two work together to complete the punching task. The upper plate 1 serves as the main body and is moved up and down by a mechanical drive device (such as a slider on a press), driving the central punch 15 and the window punch 14 to punch the forging blank 13. This invention does not limit the fixing method of the central punch 15 and the window punch 14. For example, the central punch 15 is connected to the upper plate by a second bolt 4, and the window punch is connected to the upper plate by a third bolt 6.

[0034] The lower die structure includes a lower large plate 22 and a lower die housing 16. The lower large plate 22 is located on the lower slide of the press and provides stable support, while the lower die housing 16 is designed according to the reverse shape of the forging billet 13 to ensure the stability of the forging billet 13 during the punching process. The lower die housing 16 also includes a lower die center hole 29 and a lower die window hole 30 for the discharge of waste material after punching. This utility model does not limit the connection method between the lower large plate 22 and the lower die housing 16; for example, the lower die housing 16 can be connected to the lower large plate 22 by a fourth bolt 17.

[0035] For example, the punching process may include: placing the forging blank 13 on the lower die housing 16, ensuring that its reverse side is in close contact with the lower die housing 16. Simultaneously, adjusting the position of the upper die structure so that the center punch 15 and the window punch 14 are aligned with the center hole and window position of the forging blank 13. Activating the mechanical drive device, the upper plate 1 moves the center punch 15 and the window punch 14 downwards to punch the forging blank 13. During the punching process, the front and back sides of the forging blank 13 are simultaneously subjected to pressure, forming the center hole and the window. After punching, the center scrap and window scrap are discharged through the lower die center hole 29 and the lower die window hole 30, respectively, into a scrap collection device outside the die. After punching is completed, the mechanical drive device moves the upper die structure upwards, separating the forging blank 13 from the lower die housing 16, achieving demolding.

[0036] By placing the back side of the forging billet 13 on the lower die structure, and utilizing the relatively simple shape of the back side of the forging billet 13, the demolding process becomes simpler and smoother. This reduces demolding difficulty and improves production efficiency. Due to its simple demolding, high production efficiency, and long die life, this device can significantly reduce production costs.

[0037] In one possible implementation, the upper die structure further includes: an upper die pressure plate 12; the upper die pressure plate 12 includes a through hole for the center punch 15 and the window punch 14 to pass through; the upper die pressure plate 12 is connected to the upper large plate 1 by first bolts (2 and 9) and first nut 27, the upper die pressure plate 12 is used to fix the front side of the forging blank 13; and a spring 11 is provided between the upper die pressure plate 12 and the upper large plate 1, the spring 11 is used to drive the upper die pressure plate 12 to spring open towards the forging blank 13 when the upper die structure moves upward, so that the punched forging blank 13 is separated from the center punch 15 and the window punch 14.

[0038] In order to further optimize the performance of the forging die device for punching the center hole and window of the forging wheel hub, especially to improve the demolding efficiency and ensure product quality, an upper die plate 12 and related components such as through holes, first bolts (2 and 9), first nut 27, and spring 11 are added in this embodiment.

[0039] The upper die plate 12 is located between the upper plate 1 and the forging blank 13, serving to fix the front of the forging blank 13 and assist in demolding. The shape and size of the upper die plate 12 are designed according to the shape of the front of the forging blank 13 to ensure that the two can fit tightly together. The upper die plate 12 is provided with through holes to allow the center punch 15 and the window punch 14 to pass smoothly through for stamping the forging blank 13. The position and size of the through holes need to match the position and size of the center punch 15 and the window punch 14 to ensure the accuracy and stability of the stamping process. The upper die plate 12 is connected to the upper plate 1 by the first bolts (2 and 9) and the first nut 27.

[0040] A spring 11 is installed between the upper die plate 12 and the upper large plate 1. The spring 11 is introduced to utilize its elastic force to drive the upper die plate 12 to spring open towards the forging blank 13 when the upper die structure moves upward (i.e., after stamping, the upper large plate 1 drives the center punch 15 and the window punch 14 to move upward). The spring-opening action of the spring 11 helps the punched forging blank 13 to quickly detach from the center punch 15 and the window punch 14, thereby achieving fast and efficient demolding. In addition, the introduction of the spring 11 can also reduce the impact and wear on the upper die structure during the punching process to a certain extent, extending the service life of the die.

[0041] In one possible implementation, the lower die housing 16 includes a cavity for the forging center scrap 25 and the forging window scrap 26 to fall.

[0042] A cavity refers to one or more enclosed or semi-enclosed spaces within the lower die housing 16, which serve to contain and guide scrap during the forging process. The cavity is located inside the lower die housing 16, corresponding to the lower die center hole 29 and the lower die window hole 30. Specifically, the cavity can be designed as an annular or groove-shaped structure surrounding the lower die center hole 29 or the lower die window hole 30 to ensure that scrap can fall smoothly into it.

[0043] During the forging process, center scrap and window scrap are discharged from the lower die center hole 29 and lower die window hole 30, respectively. The cavity design provides a temporary containment space for these scraps, preventing them from accumulating or scattering inside the die, thus keeping the die clean and tidy. The shape and size of the cavity can be customized according to the shape and size of the scrap to ensure that the scrap falls smoothly along a predetermined path into the scrap collection device below. The guiding effect helps reduce scrap scattering and waste, improving production efficiency and resource utilization.

[0044] Furthermore, the cavity can also protect the mold from the impact and wear of scrap to a certain extent. When scrap is discharged from the lower mold center hole 29 and the lower mold window hole 30, the scrap will first come into contact with the wall of the cavity, thus avoiding direct impact on the mold. This helps to extend the service life of the mold and reduce production costs.

[0045] Combination Figure 2 The diagram shows a structure consisting of a lower plate, a waste chute, and a waste discharge channel. Figure 2 A in the text is Figure 1 The schematic diagram of a forging die device for punching a center hole and window in a forged wheel hub, shown below, includes a front view of a lower plate, a scrap chute, and a scrap discharge channel. Figure 2 B in the text is Figure 1 The schematic diagram of a forging die device for punching a center hole and window in a forged wheel hub, shown in the diagram, includes a lower plate, a scrap chute, and a scrap discharge channel (left view). Figure 2 C in the diagram is a schematic diagram of the scrap sloping slide. In one possible embodiment, the lower die structure further includes: a scrap sloping slide 23, which is located in the cavity, and the first end of the scrap sloping slide 23 is connected to the inner wall of the lower die housing 16 through an inner wall welding point 8; the second end of the lower die housing 16 near the scrap sloping slide 23 also includes a scrap discharge channel 24, with the first end being higher than the second end; the scrap discharge channel 24 is used to discharge the forging center scrap 25 and the forging window scrap 26 that slide down along the scrap sloping slide 23.

[0046] In one possible embodiment of the forging die device for punching the center hole and window of a forged wheel hub, the lower die structure is further optimized by adding a key component, the scrap chute 23. The scrap chute 23 is designed to more effectively handle and remove scrap generated during the forging process, thereby improving production efficiency and die cleanliness.

[0047] The scrap chute 23 is an inclined plate-like structure located in the cavity of the lower die housing 16. It guides the center scrap and window scrap generated after forging along its surface until they are discharged from the die. The first end of the scrap chute 23 is securely connected to the inner wall of the lower die housing 16 via an inner wall weld point 8, ensuring its stability and reliability within the die. The scrap chute 23 slopes from the first end to the second end, forming a gradually descending ramp to facilitate the smooth sliding of the scrap.

[0048] Guided by the waste chute 23, waste can reach the waste discharge channel 24 more quickly, thereby improving waste discharge efficiency. This reduces waiting time in the production process and improves overall production efficiency.

[0049] The lower mold base housing 16 also includes a waste discharge channel 24 at its second end near the waste sloping slide 23. This channel is typically designed to connect to the second end of the waste sloping slide 23, forming a smooth waste discharge path. The shape and size of the waste discharge channel 24 can be customized according to the shape and size of the waste to ensure that the waste can be discharged smoothly.

[0050] Optionally, the design of the waste sloping slide 23 and the waste discharge channel 24 should fully consider the characteristics of the waste, such as its shape, size, and density, to ensure that the waste can slide and be discharged smoothly. Furthermore, the shape and position of the waste sloping slide 23 and the waste discharge channel 24 should be coordinated with the overall structure of the mold to avoid adverse effects on the strength and stability of the mold.

[0051] In one possible implementation, the lower profile of the upper die plate 12 is a three-dimensional shape obtained by Boolean operation on the forming surface of the front side of the forging blank 13, and the upper profile of the lower die housing 16 is a three-dimensional shape obtained by Boolean operation on the forming surface of the back side of the forging blank 13.

[0052] In one possible implementation of the forging wheel hub mold, both the upper die plate 12 and the lower die housing 16 undergo Boolean operations to obtain their three-dimensional shapes, followed by CNC contouring machining to ensure accurate positioning. Boolean operations are mathematical methods that can perform union, intersection, and difference operations on two or more sets (typically referring to three-dimensional models in mold design) to obtain new sets. In this mold design, Boolean operations are widely used for surface generation and optimization. The three-dimensional model obtained after Boolean operations constitutes the mold's surface shape. This shape accurately reflects the shape and dimensions of the forging blank 13 after spinning, providing a reliable basis for subsequent CNC contouring machining.

[0053] The lower profile of the upper die plate 12 is a three-dimensional shape obtained through Boolean operations from the forming surface of the forged blank 13 after spinning. This ensures that the upper die plate 12 and the front surface of the forged blank 13 can fit tightly together during the spinning process, thereby achieving precise forming. For example, to ensure accurate positioning of the lower profile of the upper die plate 12, it needs to be CNC profiled. This machining process ensures that the lower profile of the upper die plate 12 and the forming surface of the forged blank 13 maintain a high degree of consistency in shape, size, and position, thereby effectively preventing circumferential misalignment.

[0054] The upper profile of the lower die housing 16 is a three-dimensional shape obtained through Boolean operations from the forming surface of the back of the forged blank 13 after spinning the forged wheel hub. Similar to the lower profile of the upper die plate 12, this design ensures that the lower die housing 16 and the back of the forged blank 13 can fit tightly together during the spinning process, achieving precise forming. Similarly, to ensure accurate positioning of the upper profile of the lower die housing 16, it also needs to be CNC profiled. This machining process ensures that the upper profile of the lower die housing 16 and the forming surface of the back of the forged blank 13 maintain a high degree of consistency in shape, size, and position, thereby effectively preventing circumferential die misalignment.

[0055] The surface design of the upper die plate 12 and the lower die housing 16 ensures that the forged wheel hub achieves precise forming during the spinning process. Simultaneously, the application of CNC contour machining further improves the positioning accuracy of the die, effectively preventing problems such as circumferential die misalignment.

[0056] In one possible implementation, the structure of the center punch 15, the structure of the window punches 14, the number of window punches 14, and the arrangement of the window punches 14 are determined based on the reference structure of the forging blank 13. During the design process of the forging die, the structure, number, and arrangement of the center punch 15 and the window punches 14 are not arbitrarily determined, but require precise calculation and design based on the reference structure of the forging blank 13. This invention does not limit the specific layout of the center punch 15 and the window punches 14. Figure 3 and Figure 4The schematic diagram of the layout structure of the center punch and the window punch shown is only one possible implementation of this utility model.

[0057] The center punch 15 is a key component in the die used to stamp the center portion of the forging blank 13. Its structural design needs to fully consider the shape, size, and material properties of the center portion of the forging blank 13. Through precise calculation and simulation analysis, the shape, size, and material selection of the center punch 15 can be determined to ensure that the center portion of the forging blank 13 can be accurately formed during the stamping process, while avoiding problems such as die damage and deformation of the forging blank 13.

[0058] Window punch 14 is used to stamp the window portion on the forging blank 13. Similar to the center punch 15, its structural design also requires precise calculation and design based on the shape, size, and material properties of the window portion on the forging blank 13. Furthermore, the number of window punches 14 needs to be determined according to the number and distribution of windows on the forging blank 13. A reasonable number setting ensures that the die can simultaneously form multiple windows during the stamping process, improving production efficiency.

[0059] The arrangement of the window punches 14 needs to fully consider factors such as the distribution, shape, and size of the windows on the forging blank 13 during the design process to determine the optimal arrangement of the window punches 14. A reasonable arrangement can ensure that the die is evenly stressed during the stamping process, avoiding problems such as die damage and deformation of the forging blank 13. At the same time, it can also improve the forming accuracy and production efficiency of the die.

[0060] The reference structure of forging billet 13 is determined by the user based on requirements. First, detailed information about forging billet 13 needs to be collected, including its shape, dimensions, material properties, and the number and distribution of windows. A detailed analysis of the structure of forging billet 13 is conducted to identify its key components and forming difficulties. Based on the shape and dimensions of the central portion of forging billet 13, the structure and material selection of the central punch 15 are designed. Based on the shape, dimensions, and number of windows in forging billet 13, the structure and number of window punches 14 are designed. Taking into account the distribution, shape, and size of the windows on forging billet 13, the optimal arrangement of the window punches 14 is determined. The forming process of the mold is simulated and analyzed using simulation analysis software, and the mold design is optimized and adjusted based on the analysis results.

[0061] By designing the structure, quantity, and arrangement of the center punch 15 and window punch 14 based on the reference structure of the forging blank 13, it can be ensured that the die can accurately form the forging blank 13 during the stamping process, while improving production efficiency and product quality.

[0062] In one possible implementation, the side of the upper plate 1 away from the forging blank 13 includes an upper die positioning pin hole 5 and an upper die center positioning groove 7, which are used to position the upper die structure; the side of the lower plate 22 away from the forging blank 13 includes a lower die positioning pin hole 19 and a lower die center positioning groove 20, which are used to position the lower die structure.

[0063] In the design of forging dies, it is necessary to ensure the accurate positioning of each part of the die structure in order to improve the forming accuracy and product quality, extend the service life of the die, and reduce production costs.

[0064] The upper plate 1 has a positioning pin hole 5 on the side away from the forging blank 13. The positioning pin hole 5 is used to install the positioning pin, which, by cooperating with the corresponding hole on the upper die structure, achieves precise positioning of the upper die structure. The combination of the positioning pin hole and the positioning pin ensures that the upper die structure maintains a stable position during die installation and operation, preventing a decrease in forming accuracy or die damage due to positional deviation.

[0065] In addition to the locating pin holes, the upper plate 1 is also designed with a center locating groove 7 for the upper die. The groove is typically located in the central area of ​​the die to further ensure the accuracy of the center position of the upper die structure. The center locating groove, by engaging with the corresponding inclined surface on the upper die structure, provides a more stable positioning method. This not only prevents lateral displacement of the die during the stamping process but also corrects, to some extent, positioning inaccuracies caused by minor errors.

[0066] Similar to the upper plate 1, the lower die positioning pin hole 19 is also designed on the side of the lower plate 22 away from the forging blank 13. These holes are also used to install positioning pins, and by cooperating with the corresponding holes on the lower die structure, the precise positioning of the lower die structure is achieved. The combination of the lower die positioning pin hole 19 and the positioning pin ensures that the lower die structure maintains a stable position during die installation and operation, providing a strong guarantee for the precise forming of the forging blank 13. The lower plate 22 is also designed with a lower die center positioning groove 20 to further ensure the accuracy of the center position of the lower die structure. These grooves usually correspond to the upper die center positioning groove 7, together forming the die's center positioning system.

[0067] The lower die center positioning groove 20, by cooperating with the corresponding inclined surface on the lower die structure, provides a more stable center positioning method. This not only prevents the die from shifting vertically during the stamping process but also ensures that the center positions of all parts of the die remain consistent, thereby improving forming accuracy and product quality.

[0068] In one possible implementation, the upper plate 1 further includes an upper die lifting hole 3 on the side away from the forging blank 13 and an upper die side lifting lug 10 on the side; the upper die lifting hole 3 and the upper die side lifting lug 10 are used to lift the upper die structure; the lower plate 22 further includes a lower die lifting hole 21 on the side away from the forging blank 13 and a lower die side lifting lug 18 on the side; the lower die lifting hole 21 and the lower die side lifting lug 18 are used to lift the lower die structure.

[0069] To ensure the safe and convenient hoisting of the mold, one possible implementation is to provide hoisting structures, including hoisting holes and side lifting lugs, on the upper plate 1 and lower plate 22 respectively. The upper plate 1 has a hoisting hole 3 on the side away from the forging billet 13. The hoisting hole 3 can be located at the top or side of the mold structure and is used to install hoisting tools (such as lifting rings, hooks, etc.) to hoist the entire upper mold structure. The hoisting hole 3 provides a safe and reliable hoisting method, ensuring the stability of the upper mold structure during hoisting and preventing damage or safety accidents caused by shaking or tilting.

[0070] Optionally, in addition to the lifting holes, the side of the upper plate 1 is also designed with upper mold side lifting lugs 10. These lugs can be U-shaped or V-shaped, used to engage with the chains or ropes of lifting tools to provide additional lifting points. The upper mold side lifting lugs 10 increase the diversity of lifting points, making the lifting process more flexible. Suitable for lifting large, heavy mold structures, they can distribute the stress during lifting, protecting the mold structure from damage.

[0071] Similar to the upper plate 1, the lower plate 22 also has a lower die lifting hole 21 on the side away from the forging billet 13. The lower die lifting hole 21 is also used to install lifting tools to lift the lower die structure as a whole. The lower die lifting hole 21 provides a safe and reliable lifting method, ensuring the stability of the lower die structure during lifting. This makes the installation, maintenance, and replacement of the die more convenient and improves work efficiency. The lower plate 22 also has lower die side lifting lugs 18 on its side, for use with the chains or ropes of the lifting tools. The lifting lugs are usually used in conjunction with the lower die lifting hole 21 to jointly undertake the lifting task of the die structure. The lower die side lifting lugs 18 provide additional lifting points, making the lifting process more stable and safe. This is suitable for die structures requiring multi-angle and multi-directional lifting, ensuring that the die maintains the correct position and posture throughout the lifting process.

[0072] In one possible implementation, the forging die device for punching the center hole and window of the forging wheel hub also includes a loading and unloading structure; the loading and unloading structure is used to move the forging billet 13.

[0073] Combination Figure 5The diagram shows the operating status of a forging die device for punching a center hole and window in a forged wheel hub. Through an automated loading and unloading structure, the time and labor required for manually handling the forged billet 13 can be significantly reduced, thereby improving the overall efficiency of the production line. The precise design and control of the loading and unloading structure ensures accurate positioning of the forged billet 13 within the die, thus avoiding forging defects caused by inaccurate positioning. The automated loading and unloading structure reduces reliance on manual labor, lowers labor costs, and simultaneously improves the stability and reliability of the production line, minimizing losses due to downtime.

[0074] This invention does not limit the loading and unloading structure; for example, it can be a robotic arm. In automated production lines, the robotic arm 28 is typically used to pick up the forging billet 13 from the conveyor line and place it into the mold, as well as to remove the forged billet 13 from the mold and place it into the next process or conveyor line after forging. The robotic arm 28 features high precision and high efficiency, ensuring accurate placement and rapid movement of the forging billet 13.

[0075] In one possible implementation, the forging wheel hub punching center hole and window forging die device is used to punch holes in the forged blank 13 after the wheel rim has been spun.

[0076] In the production process of forged wheels, the five-step closed forging method is a classic and widely used process flow, which includes five main steps: rotary forging, pre-forging, final forging, punching, and rim spinning. However, in the punching step, the front of the forging blank 13 is easily damaged by the downward pressure of the press. At the same time, the complex shape makes demolding difficult, and the waste generated by punching sometimes adheres to the lower die, causing more damage to the forging blank 13 in subsequent forging processes, resulting in an increased defect rate and making automated production difficult to achieve.

[0077] Therefore, this invention changes the manufacturing sequence to: rotary forging, pre-forging, final forging, rim spinning, and punching. This optimizes the forming process of the forging billet 13, reduces damage to the front surface of the forging billet 13 during punching, and improves the feasibility of automated production. In the adjusted process, after initial forging, final forging, and rim spinning, the shape and size of the forging billet 13 are close to the final product. In particular, during the rim spinning process, the rim portion of the forging billet 13 is further processed to form the required shape and size. At this point, the internal structure of the forging billet 13 has been optimized, the material distribution is more uniform, and the strength and toughness are improved. In the final punching step, since the forging billet 13 has undergone the previous forming steps, its shape and size are more stable, thus greatly reducing the risk of damage to the front surface (window area) of the forging billet 13 during punching. At the same time, since there is a certain gap between the inner wall of the forging billet 13 and the lower die housing 16, i.e., they do not directly contact each other, this further reduces the possibility of damage to the front surface of the forging billet 13 during punching. The presence of gaps makes it easier for scrap to be discharged from the die during punching, reducing the amount of scrap adhering to the lower die and thus avoiding damage to the forging billet 13 during subsequent forging processes.

[0078] Based on the above device, the following punching process can be achieved: the upper slide of the press is in the upper position, and the upper and lower die structures are in the open state. Then, the robotic arm 28 places the forged billet after the previous spinning on the upper end of the lower die housing 16. Next, the upper slide of the press drives the upper plate 1, the upper die pressure plate 12, the window punch 14, and the center punch 15 downward. The upper die pressure plate 12 compacts the forged billet 13, and the window punch 14 and the center punch 15 continue to descend to punch the window and center hole of the forged billet 13. At the same time, the spring 11 is compressed, and the punched scrap falls onto the scrap slide 23. After punching is completed, the upper slide of the press drives the upper plate 1, the upper die pressure plate 12, the window punch 14, and the center punch 15 upward. At the same time, the spring 11 extends, that is, the elastic force of the spring 11 itself detaches the forged billet 13 from the window punch 14 and the center punch 15 and pushes it onto the upper end surface of the lower die housing 16. The robotic arm's grippers then remove the forging billet 13 and place it into the next process.

[0079] In summary, the technical solution provided by this utility model simplifies demolding by placing the back side of the forging billet, which has a simpler structure than the front side, onto the lower die structure. Furthermore, by changing the manufacturing sequence and first performing rim spinning on the forging billet, the inner wall of the forging billet and the lower die housing do not come into contact, further reducing the difficulty of demolding.

[0080] Those skilled in the art will understand that Figure 1 , Figure 2 and Figure 5 The structure shown does not constitute a limitation on the structure of this utility model. It may include more or fewer components than shown, or combine certain components, or use different component arrangements.

[0081] It should be understood that "multiple" as used in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0082] The above are merely exemplary embodiments of the present utility model and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A forging die device for punching a center hole and window in a forged wheel hub, characterized in that, The forging die device for punching the center hole and window of the forged wheel hub includes an upper die structure and a lower die structure. The upper die structure is located above the lower die structure, the front side of the forging blank corresponds to the upper die structure, and the back side of the forging blank corresponds to the lower die structure. The upper mold structure includes an upper plate, a center punch, and a window punch; The upper plate is used to drive the center punch and the window punch to move. The center punch is used to punch the center hole, and the window punch is used to punch the window. The lower mold structure includes a lower large plate and a lower mold base housing; The lower plate is used to support the lower die holder housing, and the lower die holder housing is used to fix the reverse side of the forging billet; The lower die housing includes a lower die center hole and a lower die window hole. The lower die center hole corresponds to the center punch. The lower die center hole is used for the passage of center scrap after forging. The lower die window hole corresponds to the window punch. The lower die window hole is used for the passage of window scrap after forging.

2. The forging die device for punching the center hole and window of a forged wheel hub according to claim 1, characterized in that, The upper mold structure further includes: an upper mold pressure plate; the upper mold pressure plate includes a through hole for the center punch and the window punch to pass through; The upper die plate is connected to the upper large plate by a first bolt and a first nut. The upper die plate is used to fix the front side of the forging blank. A spring is provided between the upper die plate and the upper large plate. The spring is used to drive the upper die plate to spring away from the forging blank when the upper die structure moves upward, so that the punched forging blank can be separated from the center punch and the window punch.

3. The forging die device for punching the center hole and window of the forged wheel hub according to claim 1, characterized in that, The lower die housing includes a cavity for the forging center scrap and the forging window scrap to fall through.

4. The forging die device for punching the center hole and window of the forged wheel hub according to claim 3, characterized in that, The lower mold structure further includes a waste material inclined slide, which is located in the cavity, and the first end of the waste material inclined slide is connected to the inner wall of the lower mold base housing through an inner wall welding point; The lower mold base housing also includes a waste discharge channel at the second end near the waste material inclined slide, and the first end is higher than the second end; The waste discharge channel is used to discharge the post-forging center waste and the post-forging window waste that slide down the waste chute.

5. The forging die device for punching the center hole and window of a forged wheel hub according to claim 2, characterized in that, The lower profile of the upper die plate is a three-dimensional shape obtained by Boolean operation on the forming surface of the front side of the forging blank, and the upper profile of the lower die base shell is a three-dimensional shape obtained by Boolean operation on the forming surface of the back side of the forging blank.

6. The forging die device for punching the center hole and window of a forged wheel hub according to any one of claims 1-5, characterized in that, The structure of the center punch, the structure of the window punch, the number of window punches, and the arrangement of the window punches are determined based on the reference structure of the forging blank.

7. The forging die device for punching the center hole and window of a forged wheel hub according to claim 6, characterized in that, The side of the upper plate away from the forging blank includes an upper die positioning pin hole and an upper die center positioning groove, which are used to position the upper die structure. The lower plate, on the side away from the forging blank, includes a lower die positioning pin hole and a lower die center positioning groove. The lower die positioning pin hole and the lower die center positioning groove are used to position the lower die structure.

8. The forging die device for punching the center hole and window of the forged wheel hub according to claim 7, characterized in that, The upper plate also includes an upper die lifting hole on the side away from the forging blank and an upper die side lifting lug on the side; the upper die lifting hole and the upper die side lifting lug are used to lift the upper die structure; The lower plate also includes a lower die lifting hole on the side away from the forging billet and a lower die side lifting lug on the side; the lower die lifting hole and the lower die side lifting lug are used to lift the lower die structure.

9. The forging die device for punching the center hole and window of a forged wheel hub according to claim 8, characterized in that, The forging wheel hub punching center hole and window forging die device also includes a loading and unloading structure; The loading and unloading structure is used to move the forging billet.

10. The forging die device for punching the center hole and window of a forged wheel hub according to claim 9, characterized in that, The forging die device for punching the center hole and window of the forged wheel hub is used to punch holes in the forged blank after the wheel rim has been spun.

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