Bush forming device and bush forming system
By using a bushing forming device and system, and employing cold heading technology in conjunction with a main die and a punching die mechanism, the complexity of bushing processing and cracking problems have been solved, achieving efficient and low-cost bushing forming, and improving product quality and production efficiency.
Patent Information
- Application Number
- CN202520418775.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-03-11
AI Technical Summary
In existing technologies, bushings have complex structures and are cumbersome to process, making them prone to defects such as cracks, resulting in low production efficiency and high costs.
A bushing forming device and system is adopted, which utilizes the main mold mechanism and the punching die mechanism to form bushing products in one step through cold heading process. The system includes the main mold assembly, through bar, main push tube, punch bar and punching die mechanism, which ensures uniform material filling, avoids cracks and simplifies the processing steps.
It achieves efficient molding of complex bushings, improves production efficiency and yield, reduces costs, has high material utilization, and produces products with complete internal streamlines and high strength.
Smart Images
Figure CN223789387U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of bushing forming technology, and in particular to bushing forming apparatus and bushing forming system. Background Technology
[0002] Bushings are widely used in the automotive industry, for example, in automobile suspension systems where numerous bushings are used to reduce wear between parts and provide functions such as shock absorption and noise reduction. In related technologies, bushings are often manufactured through a series of processes including cutting, heat treatment, turning, and grinding. However, due to the diverse structural forms of bushings, some types have complex structures. For example, for some irregularly shaped bushings with thin-walled holes, processing them using the above methods can easily lead to defects such as cracks. Furthermore, the processing steps are cumbersome, production efficiency is low, and costs are increased. Utility Model Content
[0003] Therefore, it is necessary to provide a bushing forming apparatus and a bushing forming system to address the aforementioned technical problems.
[0004] A bushing forming apparatus, the bushing forming apparatus comprising:
[0005] The main mold mechanism includes a main mold assembly, a through rod, and a main push tube. The main mold assembly has a shaping through hole. One end of the through rod is connected to the main mold assembly, and the other end of the through rod passes through the main push tube and protrudes from the main push tube. The other end of the through rod and the end of the main push tube extend into the shaping through hole.
[0006] A punching mechanism includes a punch bar, the punch bar including a main body and a shaping part protruding from the main body, the shaping part and the main body being configured to extend into the other end of the shaping through hole, wherein the length of the shaping part protruding from the main body is less than the length of the through bar protruding from the main push tube.
[0007] In one embodiment, the side of the shaping portion away from the main body portion has an arcuate surface or plane protruding toward the through rod; and / or
[0008] The end face of the other end of the through rod protrudes towards the shaping part.
[0009] In one embodiment, the orthographic projection of the shaping portion along the depth direction of the shaping through hole coincides with the orthographic projection of the through rod along the depth direction of the shaping through hole.
[0010] In one embodiment, the main body includes a connecting section and a die section, one end of the die section is connected to the connecting section, the other end of the die section is connected to the shaping section, and the die section protrudes from the connecting section in any direction perpendicular to the depth of the shaping through hole.
[0011] In one embodiment, a first transition surface is formed at the connection between the connecting segment and the die segment, and the first transition surface is a smooth curved surface that is recessed toward the center of the main body.
[0012] In one embodiment, the die mechanism further includes a die body and a die back pad, the die back pad being connected to the die body;
[0013] One end of the connecting segment is embedded in the die body and abuts against the die back pad, while the other end of the connecting segment protrudes from the die body and is connected to the die segment.
[0014] In one embodiment, the shaping through hole includes a first through hole and a second through hole connected in sequence. The diameter of the first through hole is larger than the diameter of the second through hole. The first through hole is configured to receive the shaping part and the main body of the punch. The second through hole is configured to receive the punch and the main push tube.
[0015] The connection between the first through hole and the second through hole forms a second transition surface, which is a smooth curved surface protruding toward the center of the shaped through hole.
[0016] In one embodiment, the main mold assembly includes a main mold body and a main mold core, the main mold core being connected to the main mold body, and the main mold core having the shaping through hole.
[0017] In one embodiment, the main mold assembly further includes a main mold back pad and an ejector pin. The main mold back pad is connected to the main mold body. The through rod and the main push tube are both connected to the main mold back pad. The ejector pin passes through the main mold back pad and is located on the side of the main push tube away from the shaping through hole.
[0018] A bushing forming system, the bushing forming system comprising the bushing forming apparatus described in any of the above claims.
[0019] The aforementioned bushing forming apparatus and bushing forming system, the bushing forming system including the bushing forming apparatus, since the length of the shaping part protruding from the main body is less than the length of the through rod protruding from the main push tube, when the punch gradually squeezes the workpiece, the material of the workpiece can fill the space around the shaping part more quickly. This makes the material in the space around the through rod, opposite to the space around the shaping part, more uniformly stressed, reducing the material forming risk in the space around the through rod, and ensuring the formation of a thin-walled hole that meets the requirements. Therefore, the bushing forming apparatus of this application embodiment utilizes the cooperation of the main mold mechanism and the punching mechanism to process bushing products using cold heading technology. The resulting bushing product can be formed in one step, achieving cold heading of bushing products with complex structures without the need for other cutting processing methods. For example, bushings with thin-walled holes can be formed without additional processing, simplifying the production process, improving production efficiency, reducing costs, and ensuring that the internal material of the bushing product has a complete streamline shape and high strength, high processing accuracy, and a high yield rate. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the bushing forming apparatus according to an embodiment of this application.
[0021] Figure 2 for Figure 1 Enlarged view of section M in the middle.
[0022] Figure 3 This is a schematic diagram of the bushing forming apparatus according to another embodiment of this application.
[0023] Figure 4 This is a schematic diagram of the bushing forming system according to an embodiment of this application.
[0024] Figure 5 for Figure 4 A schematic diagram of the processing flow for intermediate bushing products.
[0025] Icon labels:
[0026] 1. Bushing forming system;
[0027] 10. Bushing forming device;
[0028] 100. Main mold mechanism; 110. Main mold assembly; 111. Main mold body; 112. Main mold core; 113. Main mold back pad; 114. Ejector pin; 120. Through pin; 130. Main ejector tube; 140. Shaping through hole; 141. First through hole; 142. Second through hole; 143. Second transition surface;
[0029] 200. Stamping die mechanism; 210. Punch bar; 211. Main body; 211a. Connecting section; 211b. Stamping die section; 211c. First transition surface; 212. Shaping section; 220. Stamping die body; 230. Stamping die back pad;
[0030] 20. Pre-treatment device;
[0031] 30. Post-processing device;
[0032] 2. Parts to be processed;
[0033] 3. Bushing products. Detailed Implementation
[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0035] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0036] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0038] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0040] See Figure 1 and Figure 2 As shown, a schematic diagram of the bushing forming device 10 in one embodiment of this application is shown. The bushing forming device 10 provided in one embodiment of this application includes a main mold mechanism 100 and a punching mechanism 200. By using the cooperation of the main mold mechanism 100 and the punching mechanism 200, the bushing product 3 can be processed and formed by cold heading process, and the yield of the bushing product 3 is high.
[0041] The main mold mechanism 100 is disposed opposite to the punching die mechanism 200. Exemplarily, the main mold mechanism 100 is disposed below the punching die mechanism 200. The main mold mechanism 100 includes a main mold assembly 110, a through rod 120, and a main push tube 130. The main mold assembly 110 has a shaping through hole 140 for receiving the workpiece 2 to be processed. The shape of the shaping through hole 140 can be adapted to the shape of the bushing product 3. Exemplarily, the shaping through hole 140 is disposed vertically, and the depth direction of the shaping through hole 140 is the vertical direction. The through rod 120 has a generally elongated rod-shaped structure. One end of the through rod 120 is connected to the main mold assembly 110, and the other end of the through rod 120 passes through and protrudes from the main push tube 130. Specifically, the bottom end of the through rod 120 abuts against the main mold assembly 110, and the top end of the through rod 120 extends into the bottom end of the shaping through hole 140 together with the main push tube 130.
[0042] The die-casting mechanism 200 is exemplarily disposed above the main die mechanism 100. The die-casting mechanism 200 moves toward the main die mechanism 100 and presses the workpiece 2 located within the shaping through-hole 140, thereby shaping the workpiece 2 into the required shape of the bushing product 3. Specifically, the die-casting mechanism 200 includes a punch 210, which includes a main body 211 and a shaping portion 212 protruding from the main body 211. The shaping portion 212 and the main body 211 are configured to extend into the top end of the shaping through-hole 140. The shaping portion 212 is used to contact and press the workpiece 2 to form it. The length of the shaping part 212 protruding from the main body part 211 is less than the length of the through rod 120 protruding from the main push tube 130. The length of the shaping part 212 protruding from the main body part 211 is the vertical dimension of the shaping part 212, and the length of the through rod 120 protruding from the main push tube 130 is the vertical dimension of the portion of the through rod 120 protruding from the top of the main push tube 130.
[0043] With the above structural design, when the bushing needs to be produced, the through rod 120 and the main push tube 130 are inserted into the bottom end of the shaping through hole 140, and the workpiece 2 to be processed is placed in the shaping through hole 140. Then, the punch 210 of the punching die mechanism 200 is inserted into the top end of the shaping through hole 140. The shaping part 212 of the punch 210 cooperates with the through rod 120 and the main push tube 130 to squeeze the workpiece 2 to be processed, so that the workpiece 2 to be processed is deformed in the shaping through hole 140, and the bushing product 3 is gradually formed. During the production process, since the shaping part 212 of the punch 210 protrudes from the main body 211 and the through rod 120 protrudes from the main push tube 130, when the shaping part 212 and the through rod 120 are pressed against each other, the material of the workpiece 2 tends to diffuse towards the side wall of the shaping through hole 140, allowing the material of the workpiece 2 to quickly fill the space around the shaping part 212 and the space around the through rod 120, thereby filling the entire shaping through hole 140, which is conducive to processing and forming the bushing product 3 of the target shape. Furthermore, by the cooperation and pressing of the through rod 120 with the main push tube 130 and the side wall of the shaping through hole 140, a thin-walled hole can be formed on the workpiece 2, and the top surface of the through rod 120 abuts against the bottom of the thin-walled hole. Since the length of the shaping part 212 protruding from the main body 211 is less than the length of the through rod 120 protruding from the main push tube 130, when the punch 210 gradually squeezes the workpiece 2 from top to bottom, the material of the workpiece 2 can fill the space around the shaping part 212 more quickly. This makes the material in the space around the through rod 120, which is opposite to the space around the shaping part 212, more uniformly stressed, reducing the material forming risk in the space around the through rod 120, ensuring the formation of a thin-walled hole that meets the requirements, and avoiding defects such as cracks in the bushing product 3.
[0044] Therefore, the bushing forming apparatus 10 of this application embodiment utilizes the cooperation of the main mold mechanism 100 and the punching mechanism 200 to process and form the bushing product 3 by cold heading process. The resulting bushing product 3 can be formed in one step without the need for other cutting processing methods to achieve cold heading processing of bushing products 3 with complex structures. For example, bushings with thin-walled holes can be formed without additional processing, simplifying the production process, improving production efficiency, increasing material utilization, reducing material and processing costs, and ensuring that the internal material of the bushing product 3 has a complete streamline shape and high strength, high processing accuracy, and a high yield of bushing product 3.
[0045] In some embodiments, the side of the shaping portion 212 away from the main body portion 211 has an arcuate surface protruding toward the through rod 120, and the end face of the top of the through rod 120 protrudes toward the shaping portion 212. Specifically, see [reference needed]. Figure 2 As shown, the bottom surface of the shaping part 212 is a downward-protruding arc surface, and the top end of the through rod 120 is upward-protruding. In this way, when the shaping part 212 and the through rod 120 are pressed against each other, the material of the workpiece 2 to be processed can quickly diffuse to the periphery of the shaping part 212 and the through rod 120, so as to improve the processing efficiency.
[0046] In other alternative embodiments, see [link to relevant documentation]. Figure 3 As shown, the side of the shaping part 212 away from the main body part 211 has a plane protruding towards the through rod 120. At this time, the workpiece 2 can be squeezed through the shaping part 212, thereby forming a groove with a flat bottom surface on the workpiece 2. This makes it easier to open the groove later to form a through hole that runs through the entire workpiece 2, so as to meet the requirements of the bushing product 3.
[0047] Furthermore, in some embodiments, the orthographic projection of the shaping part 212 along the depth direction of the shaping through hole 140 coincides with the orthographic projection of the through rod 120 along the depth direction of the shaping through hole 140. At this time, the through rod 120 is directly opposite the shaping part 212 in the vertical direction, which facilitates the pressing of the workpiece 2 by the cooperation of the through rod 120 and the shaping part 212, thereby improving processing efficiency.
[0048] See Figure 1 and Figure 3 As shown, in some embodiments, the die mechanism 200 further includes a die body 220 and a die back pad 230, with the die back pad 230 connected to the die body 220. Specifically, the die body 220 forms the outline of the die mechanism 200, the main body portion 211 of the punch 210 passes through the die body 220, and the die back pad 230 is disposed on the side of the die body 220 away from the punch 210 and abuts against the main body portion 211 of the punch 210 to provide support for the main body portion 211.
[0049] The main body 211 includes a connecting section 211a and a die section 211b. One end of the connecting section 211a is embedded in the die body 220 and abuts against the die backing 230. The other end of the connecting section 211a protrudes from the die body 220 and is connected to the die section 211b. One end of the die section 211b is connected to the connecting section 211a, and the other end of the die section 211b is connected to the shaping section 212. The die section 211b protrudes from the connecting section 211a in any direction perpendicular to the depth of the shaping through hole 140. (Example, continue reading...) Figure 1 and Figure 3 As shown, the die section 211b is configured to protrude horizontally from the connecting section 211a, and this horizontal direction is perpendicular to the depth direction of the shaping through hole 140. In this embodiment, the dimension of the die section 211b in the horizontal direction is smaller than that of the connecting section 211a in the horizontal direction. This makes the force transmitted from the connecting section 211a to the die section 211b more concentrated, which is beneficial for extruding and forming the workpiece 2, resulting in higher processing efficiency.
[0050] Continue reading Figure 1 and Figure 3 As shown, in some embodiments, a first transition surface 211c is formed at the connection between the connecting segment 211a and the die segment 211b. The first transition surface 211c is a smooth curved surface recessed towards the center of the main body 211. Therefore, the horizontal dimension of the connection between the connecting segment 211a and the die segment 211b gradually decreases, facilitating force transmission from the connecting segment 211a to the die segment 211b, effectively preventing damage such as cracks at the connection between the connecting segment 211a and the die segment 211b, and improving service life.
[0051] In some embodiments, the main mold assembly 110 includes a main mold body 111 and a main mold core 112. The main mold core 112 is connected to the main mold body 111 and has a shaping through hole 140. Exemplarily, the main mold core 112 can be a tungsten carbide mold core, and it is disposed inside the main mold body 111. Since the shaping through hole 140 is disposed within the main mold core 112, main mold cores 112 with different shaped shaping through holes 140 can be replaced according to different shapes of bushing products 3, thereby improving the adaptability of the main mold assembly 110.
[0052] See Figure 2As shown, in some embodiments, the shaping through hole 140 includes a first through hole 141 and a second through hole 142 connected in sequence. The diameter of the first through hole 141 is larger than the diameter of the second through hole 142. The first through hole 141 is configured to receive the shaping part 212 and the main body part 211 of the punch 210. The second through hole 142 is configured to receive the through rod 120 and the main push tube 130. A second transition surface 143 is formed at the connection between the first through hole 141 and the second through hole 142. The second transition surface 143 is a smooth curved surface protruding toward the center of the shaping through hole 140. Therefore, when the shaping part 212 and the main body part 211 of the punch 210 move downward and squeeze the workpiece 2, the material of the workpiece 2 can flow along the surface of the second transition surface 143, thereby guiding the material of the workpiece 2 to gradually deform through the second transition surface 143, so as to form a bushing product 3 with a reasonable flow pattern direction, ensuring that the strength of the bushing product 3 is reliable and the quality meets the requirements.
[0053] See Figure 1 and Figure 3 As shown, in some embodiments, the main mold assembly 110 further includes a main mold back pad 113 and an ejector pin 114. The main mold back pad 113 is connected to the main mold body 111. The through rod 120 and the main push tube 130 are both connected to the main mold back pad 113. The ejector pin 114 passes through the main mold back pad 113 and is located on the side of the main push tube 130 away from the shaping through hole 140. Specifically, the main mold back pad 113 is disposed at the bottom of the main mold body 111. The bottom ends of the through rod 120 and the main push tube 130 abut against the main mold back pad 113, and the top ends of the through rod 120 and the main push tube 130 are inserted into the shaping through hole 140. Exemplarily, the main mold back pad 113 can be two layers to provide support for the through rod 120 and the main push tube 130 respectively. Furthermore, the number of ejector pins 114 can be multiple, for example, three, with the multiple ejector pins 114 evenly distributed along the circumference of the through rod 120. Therefore, after the workpiece 2 in the through hole 140 is processed, the control die mechanism 200 is moved away from the top of the main die mechanism 100, and then the ejector bar 114 is pushed upward to cooperate with the main push tube 130 to eject the processed workpiece, which is convenient to operate.
[0054] See Figure 4 As shown, Figure 4 A schematic diagram of the bushing forming system 1 in one embodiment of this application is shown. The bushing forming system 1 provided in one embodiment of this application includes the bushing forming device 10 of any of the above embodiments. It should be understood that, due to the complexity of the bushing structure, some workpieces 2 require multiple processing steps to gradually form a bushing product 3 that meets the requirements in terms of shape and quality. Accordingly, the bushing forming system 1 may include multiple bushing forming devices 10 with different structures to meet different processing requirements.
[0055] Exemplarily, in some embodiments, the bushing forming system 1 includes a pre-processing device 20, a bushing forming device 10, and a post-processing device 30. The pre-processing device 20, bushing forming device 10, and post-processing device 30 work together to cold-head thin-walled, flat, round, irregularly shaped stepped bushings for automotive applications. The processing flow is as follows: Figure 5 As shown.
[0056] Specifically, refer to Figure 4 and Figure 5 As shown, the processing flow includes: (1) Cutting: This process cuts the wire into the required length of the workpiece 2; (2) Chamfering: Removes the burrs at the ends of the workpiece 2 to eliminate the influence of the burrs on the final product; (3) Hole setting: Initially sets the inner hole to guide the subsequent hole drawing, avoiding inaccurate guidance leading to inaccurate subsequent hole drawing, which in turn leads to product defects; (4) Hole drawing + chamfering: This process involves hole drawing + bottom chamfering. Holes are drawn at the top of the workpiece 2 and chamfered at the bottom to make the material flow lines of the workpiece 2 shrink inward. It also enables the flange to be preformed, and the chamfer also reduces the material of the forming flat part, so that the material is reasonably distributed; (5) Press flange: This process forms the head flange, and the bushing forming device 10 can generate a reasonable flow pattern so that the product strength is reliable; (6) Forming: This process forms the part 2 to be processed, and the external dimensions basically meet the product requirements; (7) Waste removal: This process is waste removal, which removes the excess material in the hole, so that the dimensions of the inner hole and the complex flange shape meet the qualified product requirements, and obtains the automotive thin-walled hole flat round irregular step bushing.
[0057] The bushing forming system 1 of this application embodiment can cold-forge thin-walled hole flat round irregular stepped bushings, for example, by adopting a cold-forging scheme of hole drawing, extrusion and forming, so that the bushing is formed in one step and the flow pattern is smooth. It can realize the cold-forging of thin-walled hole flat round irregular stepped bushings without the need for other cutting processing methods, effectively saving processing costs. The mold cost is invested once, reducing costs, and can also improve production efficiency, product accuracy and material utilization, avoid product defects such as cracks, and has mass production feasibility.
[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0059] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A bushing forming apparatus, characterized in that, The bushing forming apparatus includes: The main mold mechanism includes a main mold assembly, a through rod, and a main push tube. The main mold assembly has a shaping through hole. One end of the through rod is connected to the main mold assembly, and the other end of the through rod passes through the main push tube and protrudes from the main push tube. The other end of the through rod and the end of the main push tube extend into the shaping through hole. A punching mechanism includes a punch bar, the punch bar including a main body and a shaping part protruding from the main body, the shaping part and the main body being configured to extend into the other end of the shaping through hole, wherein the length of the shaping part protruding from the main body is less than the length of the through bar protruding from the main push tube.
2. The bushing forming apparatus according to claim 1, characterized in that, The shaping portion, on the side away from the main body, has an arc-shaped surface or plane protruding toward the through rod; and / or The end face of the other end of the through rod protrudes towards the shaping part.
3. The bushing forming apparatus according to claim 1, characterized in that, The orthographic projection of the shaping part along the depth direction of the shaping through hole coincides with the orthographic projection of the through rod along the depth direction of the shaping through hole.
4. The bushing forming apparatus according to claim 1, characterized in that, The main body includes a connecting section and a punching section. One end of the punching section is connected to the connecting section, and the other end of the punching section is connected to the shaping section. The punching section protrudes from the connecting section in any direction perpendicular to the depth of the shaping through hole.
5. The bushing forming apparatus according to claim 4, characterized in that, The connection between the connecting section and the die section forms a first transition surface, which is a smooth curved surface that is recessed toward the center of the main body.
6. The bushing forming apparatus according to claim 4, characterized in that, The die mechanism further includes a die body and a die rear pad, wherein the die rear pad is connected to the die body; One end of the connecting segment is embedded in the die body and abuts against the die back pad, while the other end of the connecting segment protrudes from the die body and is connected to the die segment.
7. The bushing forming apparatus according to claim 1, characterized in that, The shaping through hole includes a first through hole and a second through hole connected in sequence. The diameter of the first through hole is larger than the diameter of the second through hole. The first through hole is configured to accommodate the shaping part and the main body of the punch. The second through hole is configured to accommodate the punch and the main push tube. The connection between the first through hole and the second through hole forms a second transition surface, which is a smooth curved surface protruding toward the center of the shaped through hole.
8. The bushing forming apparatus according to claim 1, characterized in that, The main mold assembly includes a main mold body and a main mold core. The main mold core is connected to the main mold body and is provided with the shaping through hole.
9. The bushing forming apparatus according to claim 8, characterized in that, The main mold assembly also includes a main mold back pad and an ejector pin. The main mold back pad is connected to the main mold body. The through rod and the main push tube are both connected to the main mold back pad. The ejector pin passes through the main mold back pad and is located on the side of the main push tube away from the shaping through hole.
10. A bushing forming system, characterized in that, The bushing forming system includes the bushing forming apparatus according to any one of claims 1-9.