Automobile pipe expanding die

Abstract

The utility model discloses a kind of automobile pipe fittings pipe expanding die, including opening and closing mould clamping assembly and closed mould forming assembly.The utility model adopts "opening and closing mould clamping assembly+closed mould forming assembly" composite structure, combined with elastic ejection and punch hidden collaborative design, elastic ejection mechanism fine layout, give consideration to thick-walled pipe fittings compatibility and automated mass production, overcome the defects that existing opening and closing mould exist axial closing line, closed mould is not easy to remove material and is not conducive to automation, can guarantee that pipe fittings has good appearance without post-processing, adapt thick / thin-walled pipe fittings, facilitate automated feeding and discharging, improve production efficiency and batch accuracy, reduce quality risk and production cost.

Description

Technical Field

[0001] This utility model relates to a mold for expanding pipes in automotive fittings. Background Technology

[0002] In the production process of automotive pre-retractable seat belt tubes, the tube expansion mold is a key processing equipment. The mainstream tube expansion molds in the existing technology are mainly divided into two structural forms: open and closed molds and closed molds. Both have obvious advantages and disadvantages, and it is difficult to simultaneously meet the requirements of quality, efficiency and cost in tube production.

[0003] The advantages of open and close molds are that the pipe fittings are easy to unload after processing and are suitable for the expansion of thick-walled pipe fittings. They also facilitate automated loading and unloading, improving production efficiency. However, the disadvantages are equally prominent. Due to the characteristics of the mold's open and close structure, the appearance of the pipe fittings after forming will have axial parting lines (i.e., material flash). An additional process is required to remove the parting lines, which not only prolongs the production process but may also introduce quality risks such as scratches and dimensional deviations in the pipe fittings due to post-processing operations. At the same time, it increases labor and time costs.

[0004] The advantage of closed molds is that the mold is closed and formed as a whole, the appearance of the pipe is good, there is no axial parting line, and no post-processing is required. However, the disadvantage is that the pipe is not easy to remove after processing, and it is only suitable for the expansion processing of thin-walled pipes. It is difficult to be compatible with the production of thick-walled pipes. At the same time, it is not conducive to the docking of automated loading and unloading equipment, resulting in low production efficiency and inability to meet the needs of large-scale mass production.

[0005] In summary, both existing tube expansion mold structures have unavoidable technical defects. Regardless of which mold is chosen, it will lead to high quality risks and high production costs in the production of automotive pre-shrink seat belt fittings. There is an urgent need for an improved tube expansion mold that can combine the advantages of both molds. Utility Model Content

[0006] To address the aforementioned problems, this utility model provides an automotive pipe expansion mold that overcomes the shortcomings of existing open and close molds, such as axial mold line, difficulty in material removal from closed molds, and lack of automation, effectively solving the problems mentioned in the background art.

[0007] The technical solution adopted in this utility model is:

[0008] An automotive pipe expansion mold includes an opening and closing mold clamping assembly and a closing mold forming assembly;

[0009] The opening and closing mold clamping assembly includes a mold base, and a lower mold and an upper mold disposed on the mold base. The upper mold can move in the vertical direction and forms an opening and closing structure with the lower mold for clamping the pipe body section of the pipe fitting. The pipe body section refers to the part of the pipe fitting that does not need to be formed.

[0010] The closed mold forming assembly is located on the side of the opening and closing mold clamping assembly, including a movable tube expanding mold base, a forming mold base fixed on the tube expanding mold base, and a forming slide between the forming mold base and the pipe. The forming slide and the forming mold base are elastically slidably connected in the lateral direction by an elastic ejection mechanism. A forming outer mold is fixed on the side of the forming slide facing the pipe. A punch is matched at the center of the forming outer mold. The rear end of the punch is fixed to the forming mold base. A through hole matching the punch is opened on the forming slide. The tube expanding mold base moves laterally towards or away from the pipe.

[0011] Preferably, when the elastic ejection mechanism is in the ejection reset state, the punch is hidden inside the forming outer mold, and when the elastic ejection mechanism is in the retracted state, the punch is ejected to the outside of the forming outer mold.

[0012] Preferably, the elastic ejection mechanism includes multiple springs and multiple guide posts. The two ends of the springs are fixed to the forming mold base and the forming slide, respectively. The rear end of the guide post is fixed to the forming mold base. The forming slide has multiple guide holes that match the guide posts. The springs are rectangular springs with a rectangular cross-section. Rectangular springs have the advantages of small size, good elasticity, high stiffness, and high precision.

[0013] Preferably, the springs and guide posts are arranged in a staggered, circumferential pattern around the punch.

[0014] Preferably, all the springs are provided with a height equalizing screw at their center, and the front end of the height equalizing screw is fixedly connected to the forming mold base by a thread. The forming slide is provided with a plurality of countersunk holes that match the height equalizing screw.

[0015] Preferably, a base is provided below the tube expansion mold base, and the tube expansion mold base is slidably connected to the base through a linear slide rail assembly. The linear slide rail assembly is fixed in the horizontal direction to ensure that the movable tube expansion mold base moves stably in the horizontal direction.

[0016] Preferably, the outer mold is a closed structure, which can contact the upper and lower clamping molds during the pipe expansion process to form a closed forming space that wraps the forming section of the pipe fitting. The forming section refers to the part of the pipe fitting that needs to be formed.

[0017] The innovative points of this utility model are as follows:

[0018] I. Core Innovation: The "opening and closing mold + closing mold" composite structure design breaks through the performance limitations of single molds.

[0019] 1. Clear division of functions, taking into account the core advantages of both types of molds:

[0020] The "opening and closing mold clamping assembly" (lower clamping mold + vertically movable upper clamping mold) is responsible for clamping and loading / unloading the pipe body section: Utilizing the characteristics of the opening and closing structure, on the one hand, it is convenient for automated equipment to put / take out the pipe (solving the defect of the closed mold "not conducive to automated loading and unloading"), and on the other hand, it can be adapted to thick-walled pipes by adjusting the clamping force (solving the limitation of the closed mold "only adapting to thin-walled pipes").

[0021] The "closed mold forming assembly" (forming outer mold + punch) is responsible for the closed forming of the pipe fitting forming section: through the cooperation of the closed forming outer mold and the punch, the axial mold parting line caused by the "opening and closing structure" of the opening and closing mold is avoided (solving the defect of "mold parting line requiring post-processing" in the opening and closing mold), and the appearance quality of the pipe fitting can be guaranteed without additional processes;

[0022] 2. Strong structural linkage, enabling smooth connection of the entire process of "clamping-forming-unloading".

[0023] The closed mold forming assembly is located on the side of the opening and closing mold clamping assembly. The tube expanding mold base can move horizontally toward / away from the tube: when the tube expanding mold base approaches, the outer forming mold contacts the upper and lower clamping molds to form a "closed forming space that wraps the forming section", ensuring forming accuracy; when the tube expansion is completed, the tube expanding mold base moves away, the opening and closing mold assembly opens, and the tube is easily removed quickly, breaking the deadlock of existing molds that are "either difficult to form or difficult to remove".

[0024] II. Key Innovation: Coordinated Design of Flexible Ejection and Punch Concealment

[0025] 1. Elastic ejection mechanism: During molding, the outer mold can always wrap around the outside of the forming section of the pipe, ensuring that the outer mold and the opening and closing mold clamping assembly form a closed forming space for the pipe.

[0026] The forming slide and the forming mold base are connected by a spring and a guide post to form an elastic sliding connection: when the tube expanding mold base moves the forming component toward the tube, the outer forming mold contacts the tube first. As it continues to move, the spring is compressed (the elastic ejection mechanism enters the contraction state), and the punch is ejected to the outside of the outer forming mold to complete the tube expansion forming; when the tube expansion is finished and the tube expanding mold base retracts, the spring returns to its original position (the elastic ejection mechanism enters the ejection reset state).

[0027] 2. Punch "Hidden-Ejection" State Switching: Balancing Forming Accuracy and Ease of Unloading

[0028] Ejection and reset state (non-forming): The punch is hidden inside the forming mold. At this time, the opening of the forming mold makes it easier to put the tube into the forming area, while avoiding the punch from contacting the tube in advance and causing positioning deviation.

[0029] Shrinking state (during forming): The punch is ejected to the outside of the forming mold and precisely inserted into the inside of the tube to complete the tube expansion forming, ensuring the forming dimensional accuracy;

[0030] This state switching is automatically achieved through the compression / reset of the elastic ejection mechanism, without the need for additional drive components, which simplifies the structure while ensuring the continuity of "positioning-forming-unloading".

[0031] III. Detail Innovation: The refined layout of the flexible ejection mechanism ensures the stability and consistency of mass production.

[0032] 1. The "spring + guide post" are distributed in a staggered pattern around the circumference to ensure uniform force distribution and stable sliding.

[0033] With the punch as the axis, the spring and guide post are arranged in a staggered circular pattern: the spring provides uniform elastic restoring force, avoiding excessive elastic force in one direction that could cause the forming slide to tilt.

[0034] The guide post engages with the guide hole of the forming slide to restrict the sliding direction of the forming slide (only laterally), preventing offset or jamming during sliding, ensuring the coaxiality of the punch and the tube during each forming, and improving the dimensional consistency of mass production.

[0035] 2. Equal height screw limit design to control the accuracy of elastic stroke.

[0036] All springs are equipped with equal-height screws at their centers. The front end of the screw is threaded to the forming mold base, and the rear end passes through the countersunk hole of the forming slide. The equal-height screws can precisely limit the maximum ejection amount of the spring (i.e., the maximum ejection stroke of the elastic ejection mechanism) to ensure the stability of the forming accuracy of the tube.

[0037] IV. Scenario Innovation: Balancing "Compatibility with Thick-Walled Pipe Fittings" and "Automated Mass Production" to Expand the Applicability of Molds

[0038] 1. Compatible with thick-walled pipe fittings: Adaptive clamping of the opening and closing clamping assembly.

[0039] The upper clamping mold can be adjusted in the vertical direction to move a distance and flexibly control the clamping gap according to the wall thickness of the pipe. It can not only stably clamp thick-walled pipes (avoiding pipe shaking during expansion), but also adapt to thin-walled pipes, breaking the limitation of closed molds that "can only process thin-walled pipes".

[0040] 2. Adaptable to automated loading and unloading: The convenience of the openable structure

[0041] The vertically moving opening and closing mechanism of the upper clamping mold facilitates automated equipment (such as robotic arms) to quickly place pipe fittings into the lower clamping mold or remove them from the mold without manual intervention. This solves the problem of "difficult loading and unloading and difficulty in connecting with automated lines" in existing closed molds, and meets the efficiency requirements of large-scale mass production.

[0042] This utility model adopts a composite structure of "opening and closing mold clamping component + closing mold forming component", which combines the coordinated design of elastic ejection and punch hiding, and the refined layout of elastic ejection mechanism. It takes into account the compatibility of thick-walled pipe fittings and automated mass production, and overcomes the defects of existing opening and closing molds, such as axial mold parting line, difficulty in material removal in closing mold and unfavorable to automation. It can ensure that the pipe fittings have a good appearance without post-processing, adapt to thick / thin-walled pipe fittings, facilitate automated loading and unloading, improve production efficiency and batch accuracy, and reduce quality risks and production costs. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of this utility model;

[0044] Figure 2 This is a cross-sectional view of the closed mold forming assembly. Detailed Implementation

[0045] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0048] Furthermore, the terms "first" and "second" are used 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 as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0052] like Figure 1-2 As shown, an automotive pipe expansion mold includes an opening and closing mold clamping assembly and a closing mold forming assembly;

[0053] The opening and closing mold clamping assembly includes a mold base 9, and a lower mold 8 and an upper mold 6 disposed on the mold base 9. The upper mold 6 can move in the vertical direction and forms an opening and closing structure with the lower mold 8 for clamping the pipe body section of the pipe fitting 7.

[0054] The closed mold forming assembly is located on the side of the opening and closing mold clamping assembly, including a movable tube expanding mold base 13, a forming mold base 14 fixed on the tube expanding mold base 13, and a forming slide 3 disposed between the forming mold base 14 and the pipe 7. The forming slide 3 and the forming mold base 14 are elastically slidably connected in the lateral direction by an elastic ejection mechanism. A forming outer mold 4 is fixed on the side of the forming slide 3 facing the pipe 7. A punch 5 is matched at the center of the forming outer mold 4. The rear end of the punch 5 is fixed to the forming mold base 14. A through hole 15 matching the punch 5 is opened on the forming slide 3. The moving direction of the tube expanding mold base 13 is laterally towards or away from the pipe 7.

[0055] When the elastic ejection mechanism is in the ejection reset state, the punch 5 is hidden inside the forming outer mold 4. When the elastic ejection mechanism is in the retracted state, the punch 5 is ejected to the outside of the forming outer mold 4.

[0056] The elastic ejection mechanism includes multiple springs 2 and multiple guide posts 1. The two ends of the springs 2 are fixed to the forming mold base 14 and the forming slide 3 respectively. The rear end of the guide post 1 is fixed to the forming mold base 14. The forming slide 3 is provided with multiple guide holes 16 that match the guide posts 1.

[0057] The spring 2 and guide post 1 are arranged in a staggered circular pattern with the punch as the axis.

[0058] All the springs 2 are provided with a height equalizing screw 10 at their center. The front end of the height equalizing screw 10 is fixedly connected to the forming mold base 14 by a thread. The forming slide 3 is provided with a plurality of countersunk holes 17 that match the height equalizing screw 10.

[0059] The expansion mold base 13 is provided with a base 11 below it. The expansion mold base 13 is slidably connected to the base 11 through a linear slide rail assembly 12. The linear slide rail assembly 12 is fixed in the horizontal direction to ensure that the movable expansion mold base 13 moves stably in the horizontal direction.

[0060] The outer mold 4 is a closed structure, which can contact the upper clamping mold 6 and the lower clamping mold 8 during the pipe expansion process to form a closed forming space that wraps the forming section of the pipe fitting 7.

[0061] This utility model revolves around a composite structure of "opening and closing mold clamping assembly + closing mold forming assembly," and is based on the coordinated action logic of each component in the entire process of "clamping-forming-unloading." Its core is to achieve the goal of "automated loading and unloading, compatibility with thick / thin-walled pipes, and no axial parting line" through component linkage. Specifically, it is divided into five stages: initial state, loading and unloading stage, clamping stage, pipe expansion forming stage, and unloading stage.

[0062] I. Initial state: All components are in place, ready for processing.

[0063] Before processing begins, all components of the mold are in their preset initial positions to ensure a smooth start of subsequent processes.

[0064] Mold opening and closing clamping assembly: The upper clamping mold is in the open state in the vertical direction (away from the lower clamping mold), and the lower clamping mold is fixed on the clamping mold base, with enough space reserved between the two for the pipe fitting to be inserted;

[0065] Closed mold forming assembly: The tube expansion mold base is positioned away from the tube fitting in its initial position via a linear slide rail assembly (horizontally fixed on the base) to avoid interference with loading and unloading;

[0066] Elastic ejection mechanism: When the spring is in its natural extended state (ejection reset state), the forming slide moves away from the forming mold base under the spring thrust. At this time, the punch fixed on the forming mold base is completely hidden inside the outer mold due to the position of the forming slide (the punch is not exposed to avoid premature contact with the tube and resulting positioning deviation).

[0067] Key limit: The rear end of the equal height screw (passing through the center of the spring) passes through the countersunk hole of the forming slide, and the front end is threaded to the forming mold base. Its length has been preset to the maximum stroke of the elastic ejection mechanism to ensure the accuracy of subsequent actions;

[0068] II. Loading and unloading stage: Based on the opening and closing structure, it is adapted to automated operation.

[0069] The core of this stage is to utilize the "opening and closing characteristics" of the mold clamping assembly to solve the problem of "difficult loading and unloading" in traditional closed molds:

[0070] Automated equipment (such as a robotic arm) places the automotive tubing to be processed (such as a pre-retractable seat belt tubing) into the positioning groove of the lower clamping mold, clearly defining the "tubing body section" (the part that does not need to be formed) and the "formed section" (the part that needs to be expanded) of the tubing – the tubing body section corresponds to the lower clamping mold area, and the formed section faces the side of the closed mold forming assembly;

[0071] Since the upper clamping mold is in the open state and the opening and closing direction is vertical (without lateral obstruction), the automated equipment can directly complete the "insertion" action of the pipe fitting without complicated avoidance, which is suitable for the needs of large-scale mass production automated lines.

[0072] III. Clamping Stage: Fixing the pipe fitting, compatible with thick / thin wall machining.

[0073] This stage utilizes the clamping action of the mold opening and closing clamping assembly to ensure that the pipe does not wobble during expansion, while also accommodating the processing requirements of thick-walled pipes.

[0074] The drive mechanism (such as a hydraulic cylinder) drives the upper clamping mold to move vertically downwards until it fits against the lower clamping mold, firmly clamping the "pipe body section" of the fitting.

[0075] The clamping force can be flexibly adjusted through the drive mechanism, completely solving the limitation of traditional closed molds that are "only suitable for thin-walled pipes";

[0076] IV. Tube Expansion and Forming Stage: Closed-loop forming + elastic ejection, no axial parting line

[0077] This stage is the core processing step of the mold. Through the lateral movement of the closed mold forming components and the extension and retraction of the elastic ejection mechanism, "no parting line, high-precision tube expansion" is achieved. It is specifically divided into two steps:

[0078] 1. The outer mold contacts first, creating a closed molding space.

[0079] The drive mechanism moves the pipe expansion mold base horizontally toward the pipe along the linear slide rail assembly (the linear slide rail ensures a stable movement trajectory without deviation);

[0080] As the expansion mold base moves, the outer forming mold (closed structure) fixed on the forming slide first contacts the forming section of the pipe fitting, and continues to move until it fits against the edges of the upper clamping mold and the lower clamping mold. At this time, the outer forming mold, the upper clamping mold, and the lower clamping mold together form a "closed forming space that wraps the forming section of the pipe fitting", which completely blocks the possibility of axial mold line generated by the "opening and closing gap" of the traditional open and closing mold.

[0081] 2. Spring compression and punch ejection complete tube expansion.

[0082] 1. As the expansion mold continues to move toward the pipe fitting, the outer forming mold is blocked by the pipe fitting and cannot move forward. At this time, the forming slide slides in the opposite direction relative to the forming mold (the forming mold continues to move with the expansion mold, and the forming slide is blocked by the pipe fitting).

[0083] 2. When the forming slide slides, it will compress the spring between it and the forming mold base (the elastic ejection mechanism enters the contracted state). At the same time, the guide hole on the forming slide slides along the guide post (the guide post is fixed on the forming mold base). The cooperation between the guide post and the guide hole ensures that the forming slide slides only laterally without tilting or jamming, ensuring the coaxiality of the punch and the tube.

[0084] 3. Since the rear end of the punch is fixed on the forming mold base (the position does not move), when the forming slide slides, the punch will gradually extend out from the "through hole" of the forming slide, and finally be ejected to the outside of the forming outer mold, and accurately inserted into the forming section of the pipe.

[0085] 4. The punch is continuously inserted into the forming section of the pipe fitting, and the internal size of the pipe fitting is expanded to the preset size by mechanical force to complete the pipe expansion forming. During this process, the equalizing screw will limit the maximum ejection amount of the spring to ensure that the forming size of each batch of pipe fittings is consistent.

[0086] V. Unloading Stage: Component Reset and Automated Part Retrieval

[0087] After the tube expansion is completed, the components reverse their movements to remove the tube without damage, preparing it for the next processing cycle.

[0088] 1. The expansion mold base moves laterally away from the pipe along the linear slide rail assembly, and the outer mold first detaches from the pipe;

[0089] 2. As the expanding mold base continues to retract, the compressed spring recovers its elastic potential energy, pushing the forming slide to reset in a direction away from the forming mold base (the elastic ejection mechanism returns to the ejection reset state).

[0090] 3. When the forming slide is reset, the punch moves with the forming mold base, exits from the forming section of the pipe, and is hidden back inside the forming outer mold (to avoid scratches caused by friction between the punch and the pipe).

[0091] 4. Finally, the upper clamping mold moves vertically upward to open, and the automated equipment extends into the space between the lower and upper clamping molds to remove the formed pipe fitting (without axial parting line, no post-processing required). The mold returns to its initial state and enters the next processing cycle.

[0092] Finally, it should be noted that the above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. A pipe expansion mold for automotive pipe fittings, characterized in that, The system includes an opening and closing mold clamping assembly and a closing mold forming assembly. The opening and closing mold clamping assembly includes a clamping mold base (9), and a lower clamping mold (8) and an upper clamping mold (6) disposed on the clamping mold base (9). The upper clamping mold (6) is movable in the vertical direction and forms an opening and closing structure with the lower clamping mold (8) for clamping the pipe body section of the pipe fitting (7). The closing mold forming assembly is disposed on the side of the opening and closing mold clamping assembly and includes a movable pipe expanding mold base (13), a forming mold base (14) fixed on the pipe expanding mold base (13), and a forming mold base (14) disposed on the forming mold base (14) and the forming mold base (14). The forming slide (3) between the pipe fittings (7) is elastically slidably connected to the forming mold base (14) in the transverse direction through an elastic ejection mechanism. The forming slide (3) has a forming outer mold (4) fixed on the side facing the pipe fittings (7). The center of the forming outer mold (4) is matched with a punch (5). The rear end of the punch (5) is fixed to the forming mold base (14). The forming slide (3) has a through hole (15) that matches the punch (5). The moving direction of the expanding mold base (13) is transverse towards or away from the pipe fittings (7).

2. The automotive pipe expansion mold according to claim 1, characterized in that, When the elastic ejection mechanism is in the ejection reset state, the punch (5) is hidden inside the forming outer mold (4). When the elastic ejection mechanism is in the contraction state, the punch (5) is ejected to the outside of the forming outer mold (4).

3. The automotive pipe expansion mold according to claim 2, characterized in that, The elastic ejection mechanism includes multiple springs (2) and multiple guide posts (1). The two ends of the springs (2) are fixed to the forming mold base (14) and the forming slide (3) respectively. The rear end of the guide post (1) is fixed to the forming mold base (14). The forming slide (3) is provided with multiple guide holes (16) that match the guide posts (1).

4. The automotive pipe expansion mold according to claim 3, characterized in that, The spring (2) and guide post (1) are arranged in a staggered pattern around the punch.

5. The automotive pipe expansion mold according to claim 4, characterized in that, All the springs (2) are provided with equal height screws (10) at their center. The front end of the equal height screws (10) is fixedly connected to the forming mold base (14) by threads. The forming slide (3) is provided with multiple countersunk holes (17) that match the equal height screws (10).

6. The automotive pipe expansion mold according to claim 5, characterized in that, The expansion mold base (13) is provided with a base (11) below it. The expansion mold base (13) is slidably connected to the base (11) through a linear slide rail assembly (12). The linear slide rail assembly (12) is fixed in the horizontal direction to ensure that the movable expansion mold base (13) moves stably in the horizontal direction.

7. The automotive pipe expansion mold according to claim 6, characterized in that, The outer mold (4) is a closed structure. During the pipe expansion process, it can contact the upper clamping mold (6) and the lower clamping mold (8) to form a closed forming space that wraps the forming section of the pipe fitting (7).

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