Pin shaft head forming compound die structure

Abstract

The utility model relates to composite mould technical field discloses a pin shaft head forming composite mould structure, including the utility model, including base, the base inside is provided with the ejection mechanism, the base top fixedly connected with the locating plate, the locating plate top slidingly connected with the compression plate, the compression plate's top fixedly connected with the protection mechanism, the compression plate bottom fixedly connected with the positioning mechanism, the positioning mechanism includes a plurality of insertion rods, a plurality of insertion rods top fixedly connected in the compression plate's bottom, a plurality of insertion rods's outer wall all around fixedly connected with the locating strip, the locating plate four corners are provided with a plurality of locating holes, a plurality of locating holes inner wall all slidingly connected with the wear -resisting shaft sleeve, a plurality of insertion rods are slidingly connected with corresponding wear -resisting shaft sleeve respectively, have improved the locating precision of mould whole, thereby has promoted the processing accuracy of pin shaft head forming.

Description

Technical Field

[0001] This utility model relates to the technical field of composite mold structure for forming pin heads, and in particular to a composite mold structure for forming pin heads. Background Technology

[0002] The pin head forming compound mold is an important mold used in the fields of machinery manufacturing and automotive parts processing. It is mainly used to process the head of the pin into a specific shape to meet the usage requirements of different mechanical equipment. In various mechanical assemblies, the pin is a key component for connection and positioning, and the precise shape of its head is crucial for the stable operation of the mechanical equipment. This mold can efficiently and accurately shape the pin head through one or more stamping and forming operations, which greatly improves production efficiency and product quality. It is widely used in various manufacturing plants and processing workshops.

[0003] Traditional pin head forming composite molds typically consist of an upper mold base, a lower mold base, a stamping head, and a positioning device. In use, the pin blank to be processed is placed at a designated position on the lower mold base and initially positioned by the positioning device. Then, the upper mold base drives the stamping head downward to apply pressure to the head of the pin blank, causing it to undergo plastic deformation and thus forming the desired head shape. However, the positioning device has limited accuracy and is prone to wear after repeated use, leading to inaccurate positioning of the pin blank.

[0004] To address the low precision of traditional die stamping heads, existing technologies have improved the die structure by employing more precise positioning devices, increasing the hardness and wear resistance of the stamping head, and optimizing the overall die structure design to enhance its rigidity and stability. While these improvements have enhanced the precision of the stamping head to some extent, several issues remain. The new precision positioning device is highly sensitive to environmental factors such as temperature and humidity, which can affect its positioning accuracy. Furthermore, as production continues, friction between the stamping head and the pin blank still leads to wear. Even with increased hardness and wear resistance, wear cannot be completely avoided. Once the stamping head wears, its shape and dimensions change, thus affecting stamping precision. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a composite mold structure for forming a pin head, which aims to improve the problem of insufficient precision of the stamping head in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a composite mold structure for forming a pin head, including a base, an ejection mechanism provided inside the base, a positioning plate fixedly connected to the top of the base, a pressure plate slidably connected to the top of the positioning plate, a protection mechanism provided at the top of the pressure plate, and a positioning mechanism provided at the bottom of the pressure plate.

[0007] The positioning mechanism includes multiple insertion rods, the tops of which are fixedly connected to the bottom of the pressure plate. Positioning strips are fixedly connected to the outer walls of the multiple insertion rods. Multiple positioning holes are provided at the four corners of the positioning plate. Wear-resistant bushings are slidably connected to the inner walls of the multiple positioning holes. The multiple insertion rods are slidably connected to the corresponding wear-resistant bushings. Multiple fixing screws are threaded to the front and rear sides of the positioning plate. The multiple fixing screws are threaded to the corresponding wear-resistant bushings.

[0008] As a further description of the above technical solution:

[0009] The ejection mechanism includes an ejection block disposed at the bottom of the base. A movement groove is provided at the bottom of the base. The ejection block is slidably connected inside the movement groove. A spring groove is provided at the bottom of the ejection block. An ejection spring is disposed inside the spring groove. A replaceable spring assembly is provided on the front side of the bottom of the base.

[0010] As a further description of the above technical solution:

[0011] The stamping mechanism includes a stamping wall, the top of which is fixedly connected to the bottom of the pressure plate. A return spring is slidably connected around the outer wall of the stamping wall. A telescopic head is threadedly connected inside the stamping wall, and a stamping head is fixedly connected to the bottom of the telescopic head.

[0012] As a further description of the above technical solution:

[0013] The protective mechanism includes a buffer pad, the bottom of which is fixedly connected to the top of the pressure plate, and a buffer keel is fixedly connected inside the buffer pad.

[0014] As a further description of the above technical solution:

[0015] The replacement spring assembly includes a pull block, which is disposed on the front side of the inner wall of the base. A pull groove is provided on the front side of the bottom of the base. The outer wall of the pull block is slidably connected to the inner wall of the pull block. A handle is rotatably connected to the inner wall of the pull block. A locking groove is provided at the top of the inner wall of the pull groove, and the handle engages with the locking groove.

[0016] As a further description of the above technical solution:

[0017] The size of the ejector block is the same as the size of the motion groove, and the size of the spring groove is smaller than the size of the motion groove.

[0018] As a further description of the above technical solution:

[0019] The base is fixedly connected to a fixing plate at its bottom, and the fixing plate has multiple screw holes around its perimeter.

[0020] As a further description of the above technical solution:

[0021] The inner wall of the positioning plate is provided with a sliding wall, the diameter of which is equal to the diameter of the stamping wall.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the mold structure improves the problem of low precision in the prior art through ingenious design. The insertion rod in the positioning mechanism is closely matched with the positioning hole and wear-resistant bushing on the positioning plate. The top of the insertion rod is fixed to the bottom of the pressure plate, so that when the pressure plate moves, the insertion rod can be accurately inserted into the wear-resistant bushing in the positioning hole, realizing the accurate positioning of the pressure plate on the positioning plate. The positioning strip enhances the stability of the insertion rod sliding in the wear-resistant bushing and prevents displacement. The fixing screw firmly fixes the wear-resistant bushing to the positioning plate, further ensuring the reliability of positioning. Through the synergistic cooperation of these structures, the overall positioning accuracy of the mold is improved, thereby improving the processing accuracy of the pin head forming.

[0024] 2. In this utility model, the ejection mechanism effectively improves the problems of complex and high cost of the ejection structure in the prior art through reasonable structural design. The cooperation between the ejection block and the motion groove allows the ejection block to slide smoothly in the motion groove at the bottom of the base, realizing a stable ejection action. The spring groove is opened at the bottom of the ejection block and has a built-in ejection spring to provide power for the ejection action. The structure is simple and efficient. The replacement spring assembly set on the front side of the bottom of the base facilitates quick replacement when the ejection spring malfunctions. The overall design abandons the complex ejection structure, reduces the number of parts, reduces production and maintenance costs, and at the same time ensures the reliability and stability of the ejection function. Attached Figure Description

[0025] Figure 1 This is a perspective view of a composite mold structure for forming a pin head according to the present invention.

[0026] Figure 2 This is a front view of a composite mold structure for forming a pin head according to the present invention.

[0027] Figure 3 This is a schematic diagram of the positioning mechanism of a composite mold structure for forming a pin head, as proposed in this utility model.

[0028] Figure 4 This is a schematic diagram of the protective mechanism structure of a composite mold structure for forming a pin head, as proposed in this utility model.

[0029] Figure 5 This is a schematic diagram of a replacement spring assembly structure for a pin head forming composite mold structure proposed in this utility model.

[0030] Figure 6 This is a schematic diagram of the ejection mechanism of a composite mold structure for forming a pin head, as proposed in this utility model.

[0031] Figure 7 This is a schematic diagram of the stamping mechanism for a composite mold structure for forming a pin head, as proposed in this utility model.

[0032] Legend:

[0033] 1. Base; 2. Positioning mechanism; 201. Insert rod; 202. Positioning strip; 203. Positioning hole; 204. Wear-resistant bushing; 205. Fixing screw; 3. Ejection mechanism; 301. Ejection block; 302. Movement groove; 303. Spring groove; 304. Ejection spring; 305. Replacement spring assembly; 3051. Pull-out block; 3052. Pull-out groove; 3053. Handle; 3054. Locking block groove; 4. Positioning plate; 5. Pressure plate; 6. Stamping mechanism; 601. Stamping wall; 602. Return spring one; 603. Telescopic head; 604. Stamping head; 7. Protection mechanism; 701. Buffer pad; 702. Buffer keel; 8. Fixed connecting plate; 9. Screw hole; 10. Sliding wall. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0035] Reference Figure 1 , Figure 2 and Figure 3This utility model provides an embodiment of a pin head forming composite mold structure, including a base 1. The base 1 serves as the basic support component of the entire mold structure, providing a stable installation platform for other components. An ejection mechanism 3 is provided inside the base 1. The ejection mechanism 3 is used to eject the formed pin from the mold after the pin head is formed, making it convenient to remove the finished product. A positioning plate 4 is fixedly connected to the top of the base 1. The positioning plate 4 plays a positioning and support role, providing an accurate installation position for the pressure plate 5 and other related components. The pressure plate 5 is slidably connected to the top of the positioning plate 4. The pressure plate 5 can slide on the top of the positioning plate 4, and its movement is coordinated with the working process of the mold. A protection mechanism 7 is fixedly connected to the top of the pressure plate 5. The protection mechanism 7 is used to protect the pressure plate 5 and related components that are impacted during the forming process, extending the service life of the mold. A positioning mechanism 2 is fixedly connected to the bottom of the pressure plate 5. The positioning mechanism 2 ensures the accuracy of the position of the pressure plate 5 on the positioning plate 4, so that the mold remains stable during operation.

[0036] The positioning mechanism 2 includes multiple insertion rods 201. As a key component of the positioning mechanism 2, the insertion rods 201 cooperate with the positioning holes 203 and wear-resistant bushings 204 on the positioning plate 4 to achieve precise positioning of the pressure plate 5. The tops of the multiple insertion rods 201 are fixedly connected to the bottom of the pressure plate 5. This connection method ensures that the insertion rods 201 can move synchronously with the pressure plate 5, thereby driving the pressure plate 5 to be accurately positioned on the positioning plate 4. Positioning strips 202 are fixedly connected to the outer walls of the multiple insertion rods 201. The positioning strips 202 further enhance the stability and positioning accuracy of the insertion rods 201 when sliding within the wear-resistant bushings 204, preventing the insertion rods 201 from shifting during sliding. Multiple positioning holes 203 are provided at the four corners of the positioning plate 4, providing insertion positions for the insertion rods 201. Through cooperation with the insertion rods 201, the position of the pressure plate 5 on the positioning plate 4 is determined. In this positioning plate 4, wear-resistant bushings 204 are slidably connected to the inner walls of multiple positioning holes 203. The wear-resistant bushings 204 reduce the friction between the insertion rod 201 and the positioning hole 203, improve the smoothness of the sliding of the insertion rod 201, protect the inner wall of the positioning hole 203, and extend the service life of the positioning plate 4. The multiple insertion rods 201 are slidably connected to the corresponding wear-resistant bushings 204. This connection method realizes the function of sliding and accurately positioning the pressure plate 5 on the positioning plate 4. Multiple fixing screws 205 are threaded on the front and rear sides of the positioning plate 4. The fixing screws 205 are used to fix the wear-resistant bushings 204 on the positioning plate 4 to prevent the wear-resistant bushings 204 from shifting during use. The multiple fixing screws 205 are threadedly connected to the corresponding wear-resistant bushings 204. Through this threaded connection method, it is ensured that the wear-resistant bushings 204 are firmly installed on the positioning plate 4, ensuring the reliability of the positioning mechanism 2.

[0037] Specifically, when the mold is working, the base 1 is first fixed on the workbench, and the object to be processed is placed in the groove of the base 1. The tops of multiple insert rods 201 are fixedly connected to the bottom of the pressure plate 5 and move with the pressure plate 5. Positioning holes 203 are opened at the four corners of the positioning plate 4, and wear-resistant bushings 204 are connected to the inner wall. The insert rods 201 are inserted into them and slidably connected. The positioning strip 202 enhances the sliding stability of the insert rods 201 in the wear-resistant bushings 204, ensuring that the pressure plate 5 is accurately positioned on the positioning plate 4. The fixing screws 205 on the front and rear sides of the positioning plate 4 are threadedly connected to the wear-resistant bushings 204 to prevent displacement. The accurate positioning of the pressure plate 5 drives the stamping mechanism to run accurately, solving the problem of easy displacement and inaccuracy of the stamping head in the existing technology, and realizing the precise forming of the pin head.

[0038] Reference Figure 2 , Figure 5 and Figure 6The ejection mechanism 3 includes an ejection block 301, which serves as the main actuator of the ejection mechanism 3. After the pin head is formed, the ejection block 301 ejects the pin upwards, allowing it to detach from the mold for subsequent removal. The ejection block 301 is located at the bottom of the base 1. This position ensures that the ejection block 301 can stably perform the ejection action under the support of the base 1. A motion groove 302 is provided at the bottom of the base 1, providing movement space for the ejection block 301, allowing it to slide up and down within the groove to achieve the ejection function. The ejection block 301 is slidably connected inside the motion groove 302. This sliding connection ensures that the ejection block 301 can move smoothly within the motion groove 302, accurately completing the pin ejection operation. (Replacement of spring assembly 305) The system includes a pull-out block 3051, a key component for replacing the spring assembly 305, facilitating the convenient replacement of the ejector spring 304. The pull-out block 3051 is located on the front inner wall of the base 1, a position easily accessible to the operator for convenient pull-out operation. A pull-out groove 3052 is provided on the front bottom of the base 1, offering a sliding track for the pull-out block 3051, allowing it to be pulled out along the groove. The outer wall of the pull-out block 3051 is slidably connected to its inner wall, ensuring stability and smoothness of sliding within the pull-out groove 3052. A handle 3053 is rotatably connected to the inner wall of the pull-out block 3051, facilitating the operator's application of force. Pulling the handle 3053 causes the pull block 3051 to slide within the pull groove 3052. A locking groove 3054 is provided on the top of the inner wall of the pull groove 3052. The locking groove 3054 cooperates with the handle 3053 to fix the position of the pull block 3051, preventing accidental sliding when not in use. The handle 3053 and the locking groove 3054 engage, ensuring the pull block 3051 remains stable when the spring is not being replaced, thus not affecting the normal operation of the mold. The size of the ejector block 301 is the same as the size of the motion groove 302. This size matching ensures that the ejector block 301 fits tightly within the motion groove 302, preventing wobbling and ensuring the accuracy of the ejection action. The size of the spring groove 303 is smaller than the motion groove 302. The smaller size of the spring groove 303 allows for a reasonable layout within the movement groove 302, providing installation space for the ejector spring 304 without affecting the normal movement of the ejector block 301 within the movement groove 302. The bottom of the ejector block 301 has a spring groove 303 for mounting the ejector spring 304, providing upward elasticity to the ejector block 301 and fulfilling the function of the ejector pin. The ejector spring 304 is housed inside the spring groove 303, serving as the power source for the ejection action. It generates an upward force through its elastic deformation, pushing the ejector block 301 upward. A replaceable spring assembly 305 is located on the front bottom of the base 1, facilitating replacement in case the ejector spring 304 is damaged or lacks elasticity.The spring assembly 305 can be quickly replaced to ensure the normal operation of the ejection mechanism 3;

[0039] Specifically, after the pin head is formed, the ejector spring 304 elastically deforms in the spring groove 303, generating an upward elastic force to push the ejector block 301 to slide upward in the motion groove 302, accurately ejecting the pin. This solves the problem of the existing technology not being able to eject quickly. The motion groove 302 and the ejector block 301 are size-matched, ensuring stable and accurate ejection. When the ejector spring 304 needs to be replaced, the operator pulls the handle 3053, causing the pull block 3051 to slide in the pull groove 3052, so that the handle 3053 disengages from the locking block groove 3054, allowing for convenient spring replacement. This improves the inconvenience of spring replacement and ensures that the ejector mechanism 3 continues to work normally.

[0040] Reference Figure 1 , Figure 2 and Figure 7 The stamping mechanism 6 includes a stamping wall 601, which serves as the main support structure for the stamping mechanism 6, providing a mounting base for other stamping components and bearing and transmitting pressure during the stamping process. The top of the stamping wall 601 is fixedly connected to the bottom of the pressure plate 5. This connection allows the pressure plate 5 to transmit pressure to the stamping wall 601, thereby driving the stamping mechanism 6 to work and ensuring that the stamping action is coordinated with the overall movement of the mold. Return springs 602 are slidably connected around the outer wall of the stamping wall 601. The return springs 602 are used during the stamping process. After completion, an upward reset force is provided to the stamping wall 601 to return it to its initial position for the next stamping operation. The stamping wall 601 is internally threaded with a telescopic head 603. The telescopic head 603 can adjust its extension length within the stamping wall 601 by rotating, thereby changing the position of the stamping head 604 and adjusting the stamping depth. The bottom of the telescopic head 603 is fixedly connected to the stamping head 604. The stamping head 604 acts directly on the pin head and, through a downward stamping action, makes the pin head achieve the required forming shape.

[0041] Specifically, when the stamping mechanism is working, the pressure plate 5 transmits pressure to the stamping wall 601 fixedly connected to its top. The stamping wall 601, as the main support structure, bears and transmits pressure, driving the stamping head 604 to press the pin head downwards to form it. This solves the problem of uncoordinated stamping actions in the prior art. After stamping is completed, the return spring 602 provides an upward return force, allowing the stamping wall 601 to quickly return to its initial position, solving the problem of not being able to pop out quickly and facilitating the next stamping operation. The position of the stamping head 604 can be adjusted by rotating the telescopic head 603 connected to the internal thread of the stamping wall 601.

[0042] Reference Figure 1 , Figure 3 and Figure 4The protective mechanism 7 includes a buffer pad 701, which buffers the impact force on the top of the pressure plate 5 during the stamping process, protecting the pressure plate 5 and related components from damage caused by excessive impact. The bottom of the buffer pad 701 is fixedly connected to the top of the pressure plate 5. This connection method ensures that the buffer pad 701 can be stably installed on the pressure plate 5 and effectively play its buffering role. A buffer keel 702 is fixedly connected inside the buffer pad 701. The buffer keel 702 enhances the structural strength and buffering performance of the buffer pad 701, making it less prone to excessive deformation when subjected to impact force, thus better protecting the pressure plate 5. A fixing connecting plate 8 is fixedly connected to the bottom of the base 1. The fixing connecting plate 8 is used for... The entire mold structure is fixed on the workbench or other installation position to ensure the stability of the mold during operation. The fixed connecting plate 8 has multiple screw holes 9 around its perimeter. The screw holes 9 facilitate the fastening of the fixed connecting plate 8 to the workbench mounting surface with screws, thus achieving reliable mold fixation. The inner wall of the positioning plate 4 has a sliding wall 10. The sliding wall 10 provides sliding guide space for the stamping wall 601, ensuring the accuracy and stability of the stamping wall 601 during movement. The diameter of the sliding wall 10 is equal to the diameter of the stamping wall 601. This size design allows the stamping wall 601 to slide tightly within the sliding wall 10, reducing shaking and further improving the accuracy of the stamping process.

[0043] Specifically, during mold operation, the protective mechanism 7, the fixed connecting plate 8, and the sliding wall 10 work together. The buffer pad 701 is fixed to the top of the pressure plate 5 through its bottom, buffering the impact force on the pressure plate 5 during stamping. The internal buffer keel 702 enhances its buffering performance, solving the problem that the pressure plate 5 and related components are easily damaged by impact. The fixed connecting plate 8 at the bottom of the base 1 is fastened to the worktable with screws through the screw holes 9 around the perimeter, ensuring the stability of the mold operation. The sliding wall 10 on the inner wall of the positioning plate 4 has the same diameter as the stamping wall 601, providing precise sliding guidance, reducing shaking, improving stamping accuracy, and improving the situation of unstable stamping and low precision of the mold.

[0044] Working principle: Before the mold starts working, the entire mold structure is firmly fixed to the workbench installation position by screws through the screw holes 9 around the fixed connecting plate 8, ensuring the stability of the mold during operation. The positioning plate 4 provides precise positioning and support for the upper structure of the entire mold. During the stamping stage, the pressure plate 5 slides on the top of the positioning plate 4 and is precisely positioned by cooperating with the positioning mechanism 2. The top of the insert rod 201 in the positioning mechanism 2 is fixed to the bottom of the pressure plate 5. The insert rod 201 is inserted into the wear-resistant bushing 204 in the positioning holes 203 at the four corners of the positioning plate 4. The positioning strip 202 enhances its sliding stability. The fixing screws 205 prevent the wear-resistant bushing 204 from shifting, so that the pressure plate 5 can be accurately positioned. The pressure plate 5 is precisely positioned, ensuring accurate operation of the connected stamping mechanism 6 and solving the problem of easy displacement of the stamping head. The pressure plate 5 transmits pressure to the stamping wall 601, which, as the main support structure, bears and transmits pressure to the stamping head 604. The return springs 602 around the outer wall of the stamping wall 601 provide an upward return force after stamping, allowing the stamping wall 601 to return to its initial position for the next stamping operation. By rotating the telescopic head 603 inside the stamping wall 601, the position of the stamping head 604 can be adjusted to regulate the stamping depth. The stamping head 604 presses downward against the pin head to achieve the desired forming shape.

[0045] After stamping is completed, the ejection stage begins. Ejection mechanism 3 then comes into play. Ejection spring 304, located in spring groove 303 at the bottom of ejection block 301, generates an upward force through elastic deformation, pushing ejection block 301 upwards within motion groove 302 at the bottom of base 1. This ejects the formed pin from the mold, solving the problem of stamped items not easily ejecting. If ejection spring 304 is damaged or lacks elasticity, it can be quickly replaced by operating the replacement spring assembly 305 located at the front bottom of base 1. The operator pulls handle 3053, which moves pull block 305. 1. Slide the handle 3053 in the pull-out groove 3052 to disengage it from the locking block groove 3054, and the ejector spring 304 can be replaced. The buffer pad 701 of the protection mechanism 7 is fixed to the top of the pressure plate 5 through the bottom. It buffers the impact force of the outside on the pressure plate 5 during stamping. The internal buffer keel 702 enhances its buffering performance and protects the pressure plate 5 and related components. The sliding wall 10 of the inner wall of the positioning plate 4 provides precise sliding guidance for the stamping wall 601. Because its diameter is equal to that of the stamping wall 601, it reduces the shaking of the stamping wall 601 during movement and further improves the accuracy of the stamping process.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite mold structure for forming a pin head, comprising a base (1), characterized in that: The base (1) is provided with an ejection mechanism (3), the top of the base (1) is fixedly connected to a positioning plate (4), the top of the positioning plate (4) is slidably connected to a pressure plate (5), the top of the pressure plate (5) is provided with a protection mechanism (7), and the bottom of the pressure plate (5) is provided with a positioning mechanism (2). The positioning mechanism (2) includes multiple insert rods (201), the top of which is fixedly connected to the bottom of the pressure plate (5). Positioning strips (202) are fixedly connected to the outer walls of the multiple insert rods (201). Multiple positioning holes (203) are provided at the four corners of the positioning plate (4). Wear-resistant bushings (204) are slidably connected to the inner walls of the multiple positioning holes (203). The multiple insert rods (201) are slidably connected to the corresponding wear-resistant bushings (204). Multiple fixing screws (205) are threadedly connected to the front and rear sides of the positioning plate (4). The multiple fixing screws (205) are threadedly connected to the corresponding wear-resistant bushings (204).

2. The composite mold structure for forming a pin head according to claim 1, characterized in that: The ejection mechanism (3) includes an ejection block (301), which is disposed at the bottom of the base (1). The bottom of the base (1) is provided with a motion groove (302), and the ejection block (301) is slidably connected inside the motion groove (302). The bottom of the ejection block (301) is provided with a spring groove (303), and an ejection spring (304) is disposed inside the spring groove (303). A replacement spring assembly (305) is disposed on the front side of the bottom of the base (1).

3. The composite mold structure for forming a pin head according to claim 1, characterized in that: The bottom of the pressure plate (5) is fixedly connected to a stamping mechanism (6), the stamping mechanism (6) includes a stamping wall (601), a return spring (602) is slidably connected around the outer wall of the stamping wall (601), a telescopic head (603) is threadedly connected inside the stamping wall (601), and a stamping head (604) is fixedly connected to the bottom of the telescopic head (603).

4. The composite mold structure for forming a pin head according to claim 1, characterized in that: The protective mechanism (7) includes a buffer pad (701), the bottom of which is fixedly connected to the top of the pressure plate (5), and a buffer keel (702) is fixedly connected inside the buffer pad (701).

5. The composite mold structure for forming a pin head according to claim 2, characterized in that: The replacement spring assembly (305) includes a pull block (3051), which is disposed on the front side of the inner wall of the base (1). A pull groove (3052) is provided on the front side of the bottom of the base (1). The outer wall of the pull block (3051) is slidably connected to the inner wall of the pull block (3051). A handle (3053) is rotatably connected to the inner wall of the pull block (3051). A locking groove (3054) is provided at the top of the inner wall of the pull groove (3052). The handle (3053) engages with the locking groove (3054).

6. The composite mold structure for forming a pin head according to claim 2, characterized in that: The size of the ejector block (301) is the same as the size of the motion groove (302), and the size of the spring groove (303) is smaller than the size of the motion groove (302).

7. The composite mold structure for forming a pin head according to claim 1, characterized in that: The bottom of the base (1) is fixedly connected to a fixing plate (8), and the fixing plate (8) has multiple screw holes (9) around its perimeter.

8. The composite mold structure for forming a pin head according to claim 3, characterized in that: The inner wall of the positioning plate (4) is provided with a sliding wall (10), the diameter of which is equal to the diameter of the stamping wall (601).

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