Precise cold forging die for baby carriage parts

Abstract

The invention discloses a precision cold forging die for baby carriage parts, and belongs to the field of cold forging dies, the precision cold forging die comprises a lower die and an upper die opposite to the lower die, and a double buffer cold forging assembly is arranged between the lower die and the upper die. The double-buffering cold forging assembly specifically comprises a fixing base fixed to the top end face of the lower die, a groove is formed in the middle of the side face of the fixing base, a limiting groove is formed in the bottom end face of the groove, limiting bases are symmetrically and movably connected to the two sides of the interior of the limiting groove, and adjusting pieces are arranged between the limiting bases and the fixing base. A bearing seat is arranged between the two limiting seats, a lower buffering mechanism is arranged below the bearing seat, a rectangular plate is arranged above the fixing seat, an upper buffering mechanism is arranged between the rectangular plate and the upper die, and a pressing plate and a pressing block are embedded in the middle of the interior of the rectangular plate. According to the invention, die assembly impact can be effectively buffered, forming stability and part precision are improved, and the service life of the die is prolonged.

Description

Technical Field

[0001] This invention relates to the field of cold forging dies, specifically a precision cold forging die for a children's stroller component. Background Technology

[0002] Cold forging is a precision manufacturing technique that applies pressure to a metal blank at room temperature, causing it to undergo plastic deformation within a mold cavity, thereby obtaining parts with the desired shape, size, and performance. This process offers advantages such as high material utilization, high production efficiency, good mechanical properties, and high dimensional accuracy, making it ideal for the mass production of various high-strength, complex-shaped metal structural parts required for children's strollers.

[0003] However, existing cold forging dies, especially those used for forming parts with complex cross-sections or requiring high dimensional consistency, such as Z-shaped connectors for handcarts, typically face the following problems: 1. High impact load and short die life: At the moment of die closing, the high-speed impact of the upper and lower dies generates enormous impact force, easily causing micro-cracks or crushing in the die's working parts (the forming cavity of the lower die and the punch of the upper die), reducing the die's service life. 2. Difficulty in guaranteeing product accuracy and consistency: Simple rigid die closing is prone to slight vibration or displacement under impact, which may lead to insufficient forming of parts, dimensional deviations, or the formation of flash and burrs, affecting the product's assembly accuracy and appearance quality. 3. Poor control of residual stress and springback: After forming, if the stress release process is sudden, the formed parts may deform due to elastic springback, or have large residual stress inside, affecting the fatigue strength and safety of the parts. Therefore, there is an urgent need for a cold forging die that can effectively buffer the impact of die closing, improve forming stability and part accuracy, thereby extending the die's life.

[0004] To address this issue, those skilled in the art have provided a precision cold forging die for children's stroller parts to solve the problems mentioned in the background section. Summary of the Invention

[0005] The purpose of this invention is to provide a precision cold forging die for children's stroller parts, which can effectively buffer the impact of mold closing, improve forming stability and part precision, and extend the die life, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A precision cold forging die for a children's stroller component includes: The lower mold, and the upper mold disposed opposite to the lower mold. The lower die and the upper die are provided with a double buffer cold forging assembly.

[0007] As a further embodiment of the present invention: the double-buffered cold forging assembly specifically includes: a fixed seat fixed on the top surface of the lower die, a groove is provided in the middle of the side of the fixed seat, and a limiting groove is provided on the bottom surface of the groove, limiting seats are symmetrically and movably connected on both sides inside the limiting groove, and an adjusting member is provided between the limiting seats and the fixed seat, a bearing seat is provided between the two limiting seats, and a lower buffer mechanism is provided below the bearing seat, a rectangular plate is provided above the fixed seat, and an upper buffer mechanism is provided between the rectangular plate and the upper die, a pressure plate and a pressure block are embedded in the middle of the rectangular plate, and there is a gap between the pressure plate and the pressure block and they correspond vertically to the bearing seat below.

[0008] As a further embodiment of the present invention: the upper buffer mechanism specifically includes: four shafts arranged in a rectangular shape and fixed on the top surface of a rectangular plate; the top surface of the upper mold has shaft holes corresponding to the shafts; the top of the shafts passes through the shaft holes and is fixedly connected to an anti-detachment head; the top opening of the shaft holes has a slot matching the anti-detachment head; the bottom surface of the upper mold has a strip groove corresponding to the pressure plate; and the top surface of the pressure block is fixedly connected to a limit block.

[0009] As a further embodiment of the present invention: a positioning guide rod is embedded in the middle of the top surface of the bearing seat, and a positioning guide hole is opened on the bottom surface of the pressure block corresponding to the positioning guide rod, and a tapered opening is opened at the bottom opening of the positioning guide hole.

[0010] As a further embodiment of the present invention: the lower buffer mechanism specifically includes: four vertical rods arranged in a rectangular shape and fixed on the bottom surface of the support seat. The bottom end of each vertical rod passes through the lower mold and is fixedly connected to a base. A spring column is sleeved on the lower outer side of the vertical rod. The top end of the spring column is fixedly connected to the lower mold, and the bottom end of the spring column is fixedly connected to the base.

[0011] As a further embodiment of the present invention: the bottom end face of the lower mold is symmetrically and fixedly connected with support seats on both sides, and a groove is formed between the lower mold and the two support seats, the groove providing space for the vertical rod to move downward.

[0012] As a further embodiment of the present invention: the adjusting component specifically includes: a vertical groove formed inside the limiting seat, a rotating head that matches it is movably connected inside the vertical groove, and a threaded rod is fixedly connected to the side of the rotating head away from the bearing seat, one end of the threaded rod passing through the limiting seat and the fixed seat and fixedly connected to a handle, and the threaded rod and the fixed seat are threadedly connected.

[0013] As a further embodiment of the present invention: both sides of the top surface of the upper mold are provided with circular holes, and a sleeve is fixedly connected to the lower part of the circular hole. A matching optical axis is movably connected inside the sleeve, and the bottom end of the optical axis is fixedly connected to the lower mold.

[0014] As a further embodiment of the present invention: a connector is fixedly connected to the center position of the top surface of the upper mold, and the top of the connector is connected to an external pressure device.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This application can significantly extend the service life of molds and reduce maintenance costs. Through a dual buffer system consisting of an upper buffer mechanism (composed of a shaft, shaft hole, anti-slip head, etc.) and a lower buffer mechanism (composed of a vertical rod, spring column, etc.), the intense rigid impact load in traditional cold forging processes is transformed into a smooth and controllable gradual pressure process. This mechanism effectively absorbs and disperses a large amount of instantaneous impact energy, greatly reducing the stress peak and fatigue cycle experienced by the working parts of the mold, fundamentally inhibiting the generation and propagation of microcracks. Therefore, the lifespan of key forming components of the mold can be extended several times, significantly reducing downtime for maintenance and component replacement frequency due to early mold failure, directly lowering production costs.

[0016] 2. This application significantly improves the forming accuracy and consistency of parts. The precision guiding and positioning structure ensures the accuracy of forming during the buffered dynamic process. First, the precision guiding system composed of the optical axis and sleeve ensures the absolute verticality of the upper mold's downward trajectory, avoiding mold misalignment caused by off-center loading. Second, during the mold closing and pressurization stage, the precise fit between the positioning guide rod and the positioning guide hole (including the tapered opening) forces the upper pressure block and the lower support seat to be aligned, eliminating lateral offset that may occur due to buffering activities. This results in uniform flow of the metal blank within the cavity, and the final formed part exhibits extremely high consistency and repeatability in terms of dimensional tolerances, geometry, and surface quality, fully meeting the stringent requirements for assembly reliability and safety in children's stroller structural components (Z-shaped connectors).

[0017] 3. This application optimizes the flowability of metallic materials and improves the internal quality of parts. The elastic support provided by the lower buffer mechanism ensures that the bearing seat is not completely rigid and stationary during the forming process, but rather undergoes controllable elastic downward movement. This characteristic provides a "flexible anvil" effect for the metallic material during plastic deformation, promoting more complete and uniform filling of all corners of the mold cavity, which is particularly beneficial for forming parts with complex cross-sections. At the same time, the gradual load application process reduces shear stress and flow defects within the material, resulting in a denser metallographic structure and continuous fiber flow lines in the formed part, thereby improving the mechanical properties of the part, such as fatigue strength and impact toughness, and enhancing the durability and safety of the final product.

[0018] 4. This application enhances the versatility and production flexibility of the equipment. Through unique adjusting components (including threaded rods, handles, and rotating heads), operators can easily adjust the distance between the two limit seats. It should be noted that with prolonged use of the mold, the limit seats inevitably experience wear, which can lead to a decrease in finished product accuracy. Therefore, by fine-tuning the position of the limit seats, the distance between the limit seats and the support seat is ensured to remain at a reasonable level, thereby improving accuracy. This design significantly reduces tooling investment, shortens production preparation time, and greatly improves the response speed and flexible production capacity of the production line.

[0019] 5. This application ensures stable production processes and improves overall efficiency. The dual buffering mechanism protects not only the mold but also the press itself, reducing vibration and noise during operation and creating a better working environment. A smooth mold closing process reduces vibration caused by impacts, making the connections between mold components more reliable and lowering the failure rate. Furthermore, the extended mold life, shortened mold changeover and debugging time, and improved product yield all contribute to a comprehensive improvement in the overall equipment efficiency of the production line. Attached Figure Description

[0020] Figure 1 A schematic diagram of the structure of a precision cold forging die for a children's stroller component; Figure 2 A schematic diagram of the structure of a double-buffered cold forging component in a precision cold forging die for a children's stroller part; Figure 3 A side view of a precision cold forging die for a children's stroller component; Figure 4 A view showing the combination of a pressure plate and a pressure block in a precision cold forging die for a child stroller component; Figure 5 For a precision cold forging die for a children's stroller component Figure 4 Enlarged view of part A; Figure 6 This is a combined view of the support base and vertical rod in a precision cold forging die for a children's stroller component; Figure 7 This is a schematic diagram of the Z-shaped part in a precision cold forging die for a children's stroller component.

[0021] In the diagram: 1. Lower mold; 2. Support base; 3. Fixed base; 4. Groove; 5. Limiting groove; 6. Limiting seat; 7. Threaded rod; 8. Handle; 9. Upper mold; 10. Round hole; 11. Sleeve; 12. Optical axis; 13. Connector; 14. Rectangular plate; 15. Shaft; 16. Slot; 17. Shaft hole; 18. Anti-detachment head; 19. Rotating head; 20. Vertical groove; 21. Pressure plate; 22. Pressure block; 23. Limiting block; 24. Strip groove; 25. Bearing base; 26. Vertical rod; 27. Positioning guide rod; 28. Positioning guide hole; 29. ​​Conical opening; 30. Base; 31. Spring column; 32. Z-shaped part; 33. First mounting hole; 34. Second mounting hole; 35. Third mounting hole. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] As mentioned in the background section of this application, research has revealed that existing cold forging dies, especially those used for forming parts with complex cross-sections or requiring high dimensional consistency, such as Z-shaped connectors for handcarts, typically face the following problems: 1. High impact load and short die life: At the moment of die closing, the high-speed impact of the upper and lower dies generates enormous impact force, easily causing micro-cracks or crushing in the forming cavity of the lower die 1 and the punch of the upper die 9, reducing the die's service life. 2. Difficulty in guaranteeing product accuracy and consistency: Simple rigid die closing is prone to slight vibration or displacement under impact, which may lead to insufficient forming of parts, dimensional deviations, or the formation of burrs, affecting product assembly accuracy and appearance quality. 3. Poor control of residual stress and springback: After forming, if the stress release process is sudden, the formed parts may deform due to elastic springback, or have large residual stress, affecting the fatigue strength and safety of the parts. Therefore, there is an urgent need for a cold forging die that can effectively buffer the impact of die closing, improve forming stability and part accuracy, thereby extending the die life, but certain shortcomings exist.

[0024] To address the aforementioned deficiencies, this application discloses a precision cold forging die for children's stroller parts, which can effectively buffer the impact of mold closing, improve forming stability and part precision, and extend the die life.

[0025] The following will describe in detail, with reference to the accompanying drawings, how the solution of this application solves the above-mentioned technical problems.

[0026] Please see Figures 1-6In this embodiment of the invention, a precision cold forging die for children's stroller parts includes: a lower die 1 and an upper die 9 disposed opposite to the lower die 1, wherein a double-buffered cold forging assembly is provided between the lower die 1 and the upper die 9. By introducing a two-stage buffering mechanism between the upper die 9 and the lower die 1, this assembly can effectively attenuate the huge impact force generated at the moment of die closing, converting rigid impact into controllable progressive pressure, thereby significantly improving the overall life of the die, ensuring the stability of the forming process, and laying the foundation for obtaining high-precision forgings.

[0027] In this embodiment, the double-buffered cold forging assembly specifically includes: a fixed seat 3 fixed on the top surface of the lower die 1; a groove 4 is provided in the middle of the side of the fixed seat 3; a limiting groove 5 is provided on the bottom surface of the groove 4; limiting seats 6 are symmetrically and movably connected on both sides inside the limiting groove 5; an adjusting member is provided between the limiting seats 6 and the fixed seat 3; a bearing seat 25 is provided between the two limiting seats 6; a lower buffer mechanism is provided below the bearing seat 25; a rectangular plate 14 is provided above the fixed seat 3; an upper buffer mechanism is provided between the rectangular plate 14 and the upper die 9; a pressure plate 21 and a pressure block 22 are embedded in the middle of the rectangular plate 14; there is a gap between the pressure plate 21 and the pressure block 22 and they correspond vertically to the bearing seat 25 below. Through the combined design of the fixed seat 3, adjustable limit seat 6, bearing seat 25, rectangular plate 14 and upper and lower buffer mechanisms, this component not only provides independent buffer paths for the upper and lower molds, with the upper buffer mechanism acting on the pressure end and the lower buffer mechanism acting on the pressure bearing end, but also forms a precise forming area through the middle pressure plate 21, pressure block 22 and bearing seat 25, realizing the physical separation and synergistic effect of the buffer function and the forming function.

[0028] In this embodiment, the upper buffer mechanism specifically includes: four rectangularly distributed shafts 15 fixed to the top surface of the rectangular plate 14; shaft holes 17 are provided on the top surface of the upper mold 9 corresponding to the shafts 15; the top of the shafts 15 passes through the shaft holes 17 and is fixedly connected to an anti-detachment head 18; a slot 16 matching the anti-detachment head 18 is provided at the top opening of the shaft holes 17; a strip groove 24 is provided on the bottom surface of the upper mold 9 corresponding to the pressure plate 21; and a limit block 23 is fixedly connected to the top surface of the pressure block 22. This arrangement achieves a flexible connection and initial buffer between the upper mold 9 and the pressure application component. The cooperative design of the shafts 15, shaft holes 17, anti-detachment head 18, and slot 16 utilizes the displacement of the shafts 15 to absorb the initial impact energy. The strip groove 24 and the limit block 23 ensure the directionality of pressure transmission. This mechanism constitutes the first "soft contact" defense line during the mold closing process.

[0029] In this embodiment, a positioning guide rod 27 is embedded in the middle of the top surface of the support seat 25, and a positioning guide hole 28 is formed on the bottom surface of the pressure block 22 corresponding to the positioning guide rod 27, with a tapered opening 29 at the bottom opening of the positioning guide hole 28. This arrangement ensures precise alignment of the upper and lower forming components during the buffering process. When the pressure block 22 presses down and the support seat 25 moves slightly due to buffering, the positioning guide rod 27 can accurately insert into the positioning guide hole 28, forcibly correcting any slight lateral displacement. The introduction of the tapered opening 29 reduces the difficulty of assembly and alignment, ensuring the concentricity of the forming cavity under dynamic buffering conditions, thereby directly improving the dimensional accuracy and wall thickness uniformity of the parts.

[0030] In this embodiment, the lower buffer mechanism specifically includes four rectangularly distributed vertical rods 26 fixed to the bottom surface of the support seat 25. The bottom ends of the vertical rods 26 penetrate the lower mold 1 and are fixedly connected to the base 30. A spring column 31 is sleeved on the lower outer side of the vertical rods 26. The top end of the spring column 31 is fixedly connected to the lower mold 1, and the bottom end of the spring column 31 is fixedly connected to the base 30. This configuration provides elastic support and secondary buffering for the lower support seat 25 and the blank. The combination of the vertical rods 26, the base 30, and the spring column 31 allows the support seat 25 to undergo controllable, elastic downward movement resisting downward pressure. This design not only absorbs the remaining impact energy from the upper mold 9, but more importantly, it provides an "elastic anvil" for the plastic deformation of the metal, helping the material flow more evenly and reducing the instantaneous peak stress in the mold cavity, thus protecting the core working components of the lower mold 1.

[0031] In this embodiment, support seats 2 are symmetrically fixedly connected to both sides of the bottom end face of the lower mold 1, and a slot is formed between the lower mold 1 and the two support seats 2, providing space for the vertical rod 26 to move downward. This configuration provides the necessary movement space and overall stability for the moving parts of the lower buffer mechanism. The support seats 2 lift the main body of the lower mold 1, and the formed slot ensures that the vertical rod 26 has sufficient stroke when moving downward without interfering with the worktable. At the same time, the two-point symmetrical support structure enhances the mold's anti-overturning ability and installation rigidity when subjected to eccentric loads or unbalanced buffer forces.

[0032] In this embodiment, the adjusting component specifically includes: a vertical groove 20 formed inside the limiting seat 6; a matching rotating head 19 is movably connected inside the vertical groove 20; and a threaded rod 7 is fixedly connected to the side of the rotating head 19 away from the bearing seat 25. One end of the threaded rod 7 passes through the limiting seat 6 and the fixed seat 3 and is fixedly connected to a handle 8, with the threaded rod 7 and the fixed seat 3 being threadedly connected. This arrangement provides a convenient and reliable width adjustment mechanism. By rotating the handle 8 to drive the threaded rod 7, the position of the two limiting seats 6 on the fixed seat 3 can be precisely controlled. The movable connection of the rotating head 19 within the vertical groove 20 converts the rotational motion of the threaded rod into the linear motion of the limiting seat 6, and avoids the thread from jamming due to the force on the bearing seat 25. It should be noted that with prolonged use of the mold, the limiting seat 6 will inevitably wear, which will lead to a decrease in the precision of the finished product. Therefore, by finely adjusting the position of the limiting seat 6, it is ensured that the limiting seat 6 and the bearing seat 25 always maintain a reasonable distance, thereby improving precision and enhancing the versatility and production flexibility of the equipment.

[0033] In this embodiment, circular holes 10 are provided on both sides of the top surface of the upper mold 9, and a sleeve 11 is fixedly connected to the lower part of the circular hole 10. A matching optical axis 12 is movably connected inside the sleeve 11, and the bottom end of the optical axis 12 is fixedly connected to the lower mold 1. This arrangement provides more precise guidance than traditional guide pillars during the downward movement and buffering process of the upper mold 9. Even when the buffering mechanism is working and there is complex relative movement between the upper mold 9 and the lower mold 1, the tight fit between the optical axis 12 and the sleeve 11 can ensure the absolute perpendicularity of the movement trajectory of the upper mold 9, preventing mold wear, scratches or misalignment caused by lateral forces. It is a key basic structure to ensure the smooth and orderly operation of the double buffering mechanism.

[0034] In this embodiment, a connector 13 is fixedly connected to the center of the top surface of the upper mold 9, and the top of the connector 13 is connected to an external pressure-applying device. This configuration serves as a standardized, high-strength interface between the mold and an external power source such as a press. This design ensures that pressure is efficiently and losslessly transmitted from the press to the mold body, while facilitating quick installation and replacement of the mold, thereby improving equipment utilization and maintenance efficiency of the production line.

[0035] The working principle of this invention is as follows: Step 1: Preparation and Adjustment Stage. Based on the blank size or product specifications of the children's stroller component (Z-shaped part 32) to be formed, the mold is adjusted accordingly. The operator rotates the handles 8 located on both sides of the fixed seat 3. The handles 8 drive the threaded rod 7 to rotate. Since the threaded rod 7 is threadedly connected to the fixed seat 3, and the rotating head 19 is constrained within the vertical groove 20 of the limiting seat 6, the rotational motion is converted into linear motion of the limiting seat 6 along the upper limiting groove 5 of the fixed seat 3. By adjusting the opposing or backward movement of the limiting seats 6 on both sides, the distance between them can be changed, thereby providing lateral limiting for the support seat 25. It should be noted that with prolonged use of the mold, the limiting seats 6 inevitably experience wear, which can lead to a decrease in the precision of the finished product. Therefore, by fine-tuning the position of the limiting seats 6, it is ensured that the limiting seats 6 and the support seat 25 always maintain a reasonable distance, thereby improving precision. After adjustment, the metal blank is placed at a predetermined position on the top surface of the support seat 25.

[0036] Step 2: Initial contact and upper buffer intervention stage of mold closing. The external press drives the upper mold 9 to move downward through the connector 13. The upper mold 9 descends smoothly along the precise guide of the optical axis 12. When it descends to a certain distance, the pressure block 22 and pressure plate 21 mounted on the rectangular plate 14 first contact the blank placed on the support seat 25. At this time, the upper buffer mechanism begins to play a key role: since the rectangular plate 14 is floatingly connected to the upper mold 9 through four shafts 15 (the anti-detachment head 18 at the top of the shaft 15 is stuck in the slot 16 of the upper mold 9, but there is axial movement space), when the pressure block 22 is obstructed from contacting the blank, the momentum of the upper mold 9 continuing to descend will not be rigidly transmitted immediately. Instead, the upper mold 9 will produce a small downward displacement relative to the rectangular plate 14, causing the anti-detachment head 18 to disengage from the slot 16. This process achieves the first level of buffering, transforming the initial rigid impact into a flexible, gradual preload, and ensuring that the pressure block 22 is in centered contact with the blank, avoiding lateral slippage.

[0037] Step 3: The forging and forming stage, combined with the lower buffer mechanism, involves continuous pressure application by the press. The force is transmitted through the upper die 9 and the limiting block 23 to the pressure block 22 and the pressure plate 21, ultimately acting on the blank. The blank begins to plastically deform and fill the cavity formed by the pressure plate 21, the lower end face of the pressure block 22, and the upper end face of the support seat 25. Simultaneously, the lower buffer mechanism activates: the forming pressure is transmitted through the blank and the support seat 25 to the four vertical rods 26, attempting to force the support seat 25 downwards. However, the spring pillars 31 (typically high-strength helical springs or nitrogen springs) below the vertical rods 26 provide strong counter-support. The compression of the spring pillars 31 absorbs significant impact energy and provides a controllable, elastic counter-pressure field for the entire forming process—this is the second-stage buffer. At this stage, the positioning guide rod 27 is precisely inserted into the positioning guide hole 28 at the bottom of the pressure block 22. The tapered opening 29 ensures smooth insertion even with minor deviations. This structure ensures that under forming load, the forming components of the upper die 9 (pressure block 22 and pressure plate 21) and the forming components of the lower die 1 (support seat 25) maintain extremely high coaxiality, fundamentally suppressing die misalignment and uneven product wall thickness caused by lateral forces. The dual buffering mechanisms (upper and lower buffering mechanisms) work synergistically at this stage, transforming the powerful impact forging pressure into a relatively smooth, slightly longer-lasting "pressure-slow-release" process. This significantly reduces the instantaneous stress peaks on the die cavity surface and the punch (pressure block 22 and pressure plate 21), effectively preventing the generation of microcracks and allowing for more complete and uniform metal flow, thereby obtaining high-quality forgings with precise dimensions, clear contours, and dense internal structure.

[0038] Step 4: Mold Opening and Reset Stage. After the forming process is completed, the press drives the upper mold 9 to return upwards. The spring column 31 of the lower buffer mechanism releases its stored elastic potential energy, pushing the base 30, vertical rod 26, and bearing seat 25 upwards to reset to their initial positions, making it easier for the robot or operator to remove the formed part. At the same time, the rectangular plate 14 resets relative to the upper mold 9 under its own gravity until the anti-dislodgement head 18 at the top of the shaft 15 re-embeds into the slot 16 of the upper mold 9, preparing for the next mold closing cycle.

[0039] It should be noted that the molded Z-shaped part 32, as Figure 7 As shown, during the preparation and adjustment stage, the second mounting hole 34 of the Z-shaped part 32 is fitted onto the positioning guide rod 27 for easy positioning. In addition, the first mounting hole 33, the second mounting hole 34, and the third mounting hole 35 are all pre-reserved on the blank to facilitate subsequent installation on the handcart.

[0040] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0041] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A precision cold forging die for a child stroller component, characterized in that, include: The lower mold (1) and the upper mold (9) disposed opposite to the lower mold (1). Among them, a double buffer cold forging assembly is provided between the lower die (1) and the upper die (9); The double buffer cold forging assembly specifically includes: a fixed seat (3) fixed on the top surface of the lower die (1), a groove (4) is provided in the middle of the side of the fixed seat (3), and a limiting groove (5) is provided on the bottom surface of the groove (4). A limiting seat (6) is symmetrically and movably connected to both sides inside the limiting groove (5), and an adjusting member is provided between the limiting seat (6) and the fixed seat (3). A bearing seat (25) is provided between the two limiting seats (6), and a lower buffer mechanism is provided below the bearing seat (25).

2. The precision cold forging die for a children's stroller component according to claim 1, characterized in that, A rectangular plate (14) is provided above the fixed seat (3), and an upper buffer mechanism is provided between the rectangular plate (14) and the upper mold (9). A pressure plate (21) and a pressure block (22) are embedded in the middle of the rectangular plate (14), and there is a gap between the pressure plate (21) and the pressure block (22) and they correspond to the bearing seat (25) below.

3. The precision cold forging die for a children's stroller component according to claim 2, characterized in that, The upper buffer mechanism specifically includes: four shafts (15) arranged in a rectangle and fixed on the top surface of the rectangular plate (14); the top surface of the upper mold (9) is provided with shaft holes (17) corresponding to the shafts (15); the top of the shafts (15) passes through the shaft holes (17) and is fixedly connected with an anti-detachment head (18); the top opening of the shaft hole (17) is provided with a slot (16) matching the anti-detachment head (18); the bottom surface of the upper mold (9) is provided with a strip groove (24) corresponding to the pressure plate (21); and the top surface of the pressure block (22) is fixedly connected with a limit block (23).

4. A precision cold forging die for a children's stroller component according to claim 3, characterized in that, A positioning guide rod (27) is embedded in the middle of the top surface of the bearing seat (25). A positioning guide hole (28) is opened on the bottom surface of the pressure block (22) corresponding to the positioning guide rod (27), and a tapered opening (29) is opened at the bottom opening of the positioning guide hole (28).

5. A precision cold forging die for a children's stroller component according to claim 4, characterized in that, The lower buffer mechanism specifically includes: four vertical rods (26) arranged in a rectangle and fixed on the bottom surface of the support seat (25). The bottom end of the vertical rod (26) passes through the lower mold (1) and is fixedly connected to the base (30). A spring column (31) is sleeved on the lower side of the outer side of the vertical rod (26). The top end of the spring column (31) is fixedly connected to the lower mold (1), and the bottom end of the spring column (31) is fixedly connected to the base (30).

6. A precision cold forging die for a children's stroller component according to claim 5, characterized in that, The bottom end face of the lower mold (1) is symmetrically fixedly connected with support seats (2), and a groove is formed between the lower mold (1) and the two support seats (2), which provides space for the vertical rod (26) to move down.

7. A precision cold forging die for a children's stroller component according to claim 6, characterized in that, The adjusting component specifically includes: a vertical groove (20) opened inside the limiting seat (6), a rotating head (19) that matches it is movably connected inside the vertical groove (20), and a threaded rod (7) is fixedly connected to the side of the rotating head (19) away from the bearing seat (25). One end of the threaded rod (7) passes through the limiting seat (6) and the fixed seat (3) and is fixedly connected to a handle (8), and the threaded rod (7) and the fixed seat (3) are threadedly connected.

8. A precision cold forging die for a child stroller component according to claim 7, characterized in that, The upper mold (9) has round holes (10) on both sides of its top surface, and a sleeve (11) is fixedly connected to the lower part of the round hole (10). The sleeve (11) is movably connected to a matching optical axis (12), and the bottom end of the optical axis (12) is fixedly connected to the lower mold (1).

9. A precision cold forging die for a children's stroller component according to claim 8, characterized in that, The top surface of the upper mold (9) is fixedly connected to a connector (13), and the top of the connector (13) is connected to an external pressure device.

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