Forming mold with positioning function and bicycle pipe fitting

Abstract

The utility model belongs to the technical field of pipe hydraulic forming, and particularly relates to a forming die with a positioning function and a bicycle pipe fitting, which comprise a male die, a female die and a datum plate. The male die and the female die can be buckled to form a forming cavity used for containing a to-be-formed pipe fitting. The datum plate is movably arranged on the female die, can move relative to the female die and is provided with a first position and a second position, when the datum plate is located at the first position, the datum plate is located at one end of the forming cavity and used for abutting against one end of a to-be-formed pipe fitting, and when the datum plate is located at the second position, the datum plate is separated from one end of the forming cavity. According to the die, the movable datum plate is arranged on the female die, so that the length of the part, extending out of the forming cavity, of the to-be-formed pipe fitting is a fixed value when the to-be-formed pipe fitting is placed, in this way, the cutting positions of the formed pipe fittings in different batches are consistent, then it is guaranteed that a reference datum exists in the subsequent cutting operation, and the cutting efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe hydraulic forming, in particular to a forming die with a positioning function and a bicycle pipe fitting. Background Art

[0002] With the development of bicycle technology, bicycles have become an increasingly popular means of transportation, and people are increasingly researching bicycles. Among them, the requirements for bicycle pipe fittings are becoming increasingly higher. As the shapes of pipe fittings become more and more complex, ordinary hard mold cold pressing can no longer meet the complex requirements of the edges and plane shapes of pipe fittings. In order to cope with the complex shape of pipe fittings, a hydraulic forming mold is currently mainly used on the market. This mold forms a cavity by closing the upper and lower molds, and the pipe fitting is placed in the cavity. Sealing plugs are used at both ends of the pipe fitting to plug the pipe fitting and high-pressure liquid is injected into the pipe fitting. With the injection of high-pressure liquid and the propulsion of the sealing plug, the pipe fitting is formed into the required workpiece against the inner wall of the mold cavity.

[0003] With current hydraulic forming dies, the length of the tube extending beyond the die is manually determined visually during tube placement. This results in different placement positions each time, leading to varying lengths of the cut section (caused by the sealing plug) after each forming operation within the same cavity. Consequently, the cutting position during subsequent cutting operations also varies. This lacks a unified reference base for cutting, impacting subsequent cutting operations. Existing techniques typically add an ineffective segment cutting operation to create a cutting reference surface that meets the laser cutting positioning requirements. This not only reduces cutting efficiency but also increases tube manufacturing costs due to the additional cutting process and tool. Utility Model Content

[0004] The purpose of the utility model is to provide a forming die and a bicycle pipe fitting with a positioning function. By arranging a reference plate on the die, the overhanging length of the pipe fitting to be formed each time is consistent, and the cutting position of the pipe fittings after forming different batches is also consistent, thereby ensuring a reference reference for subsequent cutting operations and improving cutting efficiency.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] In one aspect, the present invention provides a molding die with a positioning function, comprising:

[0007] A male mold, wherein the male mold is provided with a first cavity;

[0008] A female mold having a second mold cavity, and the male mold having a molding position for engaging with the female mold and a separation position for separating from the female mold. When the male mold is in the molding position, the first mold cavity and the second mold cavity together enclose a molding chamber, and both ends of the molding chamber are connected to the outside world. The molding chamber is used to place the pipe to be molded;

[0009] A reference plate, the reference plate is movably arranged on the mother mold and the reference plate can move relative to the mother mold to have a first position and a second position. When the reference plate is located at the first position, the reference plate is located at one end of the molding chamber and is used to abut against one end of the pipe to be molded. When the reference plate is located at the second position, the reference plate is separated from one end of the molding chamber.

[0010] Furthermore, the mother mold is slidably connected to the reference plate, one of the mother mold and the reference plate is provided with a sliding groove, and the other is provided with a slider, and the slider is slidably connected to the sliding groove.

[0011] Furthermore, the female mold is further provided with a first position-limiting member, and when the reference plate moves from the second position to the first position, the reference plate abuts against the first position-limiting member.

[0012] Furthermore, when the male mold moves from the separation position to the molding position, the male mold drives the reference plate to move from the first position to the second position.

[0013] Furthermore, the male mold includes a male mold body and a plurality of pressure plates arranged on the male mold body, and the plurality of pressure plates are arranged at intervals along the length direction of the reference plate. When the male mold moves from the separation position to the forming position, the plurality of pressure plates abut against the reference plate and drive the reference plate to move from the first position to the second position.

[0014] Furthermore, the molding die with a positioning function further includes an elastic member, wherein the elastic member is connected between the mother mold and the reference plate, and the elastic member is configured to make the reference plate always have a tendency to move toward the first position.

[0015] Furthermore, the elastic member is a compression spring, the mother mold is also provided with a guide rod, the reference plate is provided with a guide hole, the guide rod is inserted into the guide hole, the compression spring is sleeved on the guide rod and the two ends of the compression spring are respectively in contact with the mother mold and the reference plate.

[0016] Furthermore, a positioning boss is protruding from the first cavity wall or the second cavity wall.

[0017] Furthermore, the mother mold is also provided with a positioning hole, the reference plate is also provided with a pin hole, and the molding mold with a positioning function also includes a pin. When the reference plate moves to the second position, the pin passes through the pin hole and is plugged into the positioning hole to fix the relative position of the reference plate and the mother mold.

[0018] In another aspect, the present invention provides a bicycle pipe fitting, comprising:

[0019] The bicycle tube comprises an effective section in the middle and sections to be cut located at both ends of the effective section. The bicycle tube is formed by processing the tube to be formed through any one of the above-mentioned forming dies with positioning function.

[0020] The molding die with positioning function of the utility model has at least the following beneficial effects:

[0021] The molding die with positioning function of the present invention comprises a male mold, a female mold and a reference plate. The male mold is provided with a first mold cavity; the female mold is provided with a second mold cavity, the male mold has a molding position for engaging with the female mold and a separation position for separating from the female mold. When the male mold is in the molding position, the first mold cavity and the second mold cavity enclose a molding chamber, and both ends of the molding chamber are connected to the outside world. The molding chamber is used to place the pipe to be molded; the reference plate is movably provided on the female mold and the reference plate can be movable relative to the female mold to have a first position and a second position. When the reference plate is in the first position, the reference plate is located at one end of the molding chamber and is used to abut against one end of the pipe to be molded. When the reference plate is in the second position, the reference plate is separated from one end of the molding chamber. The mold is provided with a movable reference plate on the mother mold. When placing the pipe to be formed, the reference plate is moved so that the length of the pipe extending out of the molding chamber is a constant value, thereby ensuring that the extension length of the pipe to be formed is consistent each time it is placed. In this way, the cutting position of the pipes after molding in different batches is also consistent, thereby ensuring a reference base for subsequent cutting operations and improving cutting efficiency.

[0022] The bicycle pipe fitting of the utility model has at least the following beneficial effects:

[0023] The bicycle pipe fitting is processed using the above-mentioned forming mold with a positioning function, and has an effective section and a section to be cut. Since the length of the section to be cut of the pipe fitting is consistent after each forming, the formed pipe fitting can directly meet the requirements of laser cutting positioning, and there is no need to add additional cutting operations for the invalid section, thereby reducing the manufacturing cost of the pipe fitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a forming die with a positioning function in an embodiment of the present utility model;

[0025] Figure 2It is a side view of a forming die with a positioning function in an embodiment of the present utility model;

[0026] Figure 3 This is a structural schematic diagram of a molding die with a positioning function in an embodiment of the present utility model without a male die;

[0027] Figure 4 It is a side view of the molding die with positioning function in the embodiment of the utility model without the male die;

[0028] Figure 5 This is a schematic structural diagram of the male mold in an embodiment of the present utility model;

[0029] Figure 6 In the embodiment of the present utility model Figure 5 A partial enlarged view of point A in the middle;

[0030] Figure 7 It is a structural schematic diagram of the cutting positioning member in an embodiment of the present utility model.

[0031] In the picture:

[0032] 1. Male mold; 11. First cavity; 12. Male mold body; 13. Pressing plate; 14. Positioning boss; 2. Female mold; 21. Second cavity; 22. Slide; 23. First position limiter; 24. Guide rod; 25. Positioning hole; 3. Reference plate; 31. Guide hole; 32. Pin hole; 4. Molding chamber; 5. Slider; 6. Elastic member; 61. Compression spring; 7. Pin; 8. Second position limiter; 9. Cutting positioner; 91. Cutting positioner; 911. Positioning groove. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0034] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0037] In order to cope with the complex shape of pipe fittings, the main method currently used on the market is to use a hydraulic forming mold, which can inject high-pressure liquid into the pipe to be formed so that it can be formed into the desired pipe fitting along the mold cavity. However, since the current hydraulic forming mold is to manually place the pipe fittings and visually judge the length of the pipe fittings extending out of the mold at both ends, the placement position of the pipe fittings will be different each time, which will lead to different lengths of the to-be-cut section (caused by the sealing plug) of the pipe fittings after each forming in the same cavity. As a result, the cutting position of the pipe fittings in subsequent cutting operations is also different each time, that is, there is no unified reference base for cutting, which affects the subsequent cutting operations. The existing technology generally adds an invalid segment cutting operation, and first cuts the to-be-cut section after forming to obtain a cutting reference surface so that it can meet the laser cutting positioning requirements in the subsequent cutting operation. Such an operation not only reduces the cutting efficiency, but also increases the manufacturing cost of the pipe fittings due to the additional cutting process and a cutting tool.

[0038] To address this issue, this embodiment provides a molding die with a positioning function to address the aforementioned issues. This die ensures that the length of the tube protruding from the molding chamber is consistent each time the tube is placed. This ensures that the cutting positions of tubes formed in different batches are consistent, thereby providing a reference for subsequent cutting operations, improving cutting efficiency. Furthermore, the laser cutting positioning requirements can be met without the need for additional cutting of ineffective sections, thereby reducing the manufacturing cost of the tubes. Such tubes include, but are not limited to, bicycle tubes and electric-assisted bicycle tubes, and the die includes, but is not limited to, a hydraulic forming die.

[0039] Please refer to Figures 1 to 6 As shown, the molding die with a positioning function includes a male mold 1, a female mold 2, and a reference plate 3. The male mold 1 is provided with a first cavity 11; the female mold 2 is provided with a second cavity 21. The male mold 1 has a molding position for engaging with the female mold 2 and a separation position for separating from the female mold 2. When the male mold 1 is in the molding position, the first cavity 11 and the second cavity 21 enclose a molding chamber 4, and both ends of the molding chamber 4 are connected to the outside world. The molding chamber 4 is used to place the pipe to be molded. The reference plate 3 is movably provided on the female mold 2 and can move relative to the female mold 2 to have a first position and a second position. When the reference plate 3 is in the first position, the reference plate 3 is located at one end of the molding chamber 4 and is used to abut against one end of the pipe to be molded. When the reference plate 3 is in the second position, the reference plate 3 is separated from one end of the molding chamber 4. Specifically, in this embodiment, when the tube to be formed is placed on the mother mold 2, the reference plate 3 is in the first position and the distance from the side of the reference plate 3 facing the forming chamber 4 to the opening of the forming chamber 4 connected to the outside is a constant. Therefore, when one end of the tube to be formed abuts against the reference plate 3, the length of the tube to be formed extending out of one end of the forming chamber 4 is also a constant. Repeating the above-mentioned action when the tube to be formed is subsequently placed on the mother mold 2 can ensure that the length of the tube to be formed extending out of the forming chamber 4 is the same each time. With such a setting, the cutting positions of different batches of formed tubes can also be consistent. In subsequent cutting operations, the end face of the formed tube can be directly used as the cutting reference for cutting, and there is no need to add an additional invalid segment cutting operation, thereby reducing the manufacturing cost of the tube.

[0040] Alternatively, as Figures 1 to 4 As shown, the master mold 2 is slidably connected to the reference plate 3. One of the master mold 2 and the reference plate 3 is provided with a slide groove 22, and the other is provided with a slider 5, which is slidably connected to the slide groove 22. In this embodiment, the sliding fit between the slider 5 and the slide groove 22 enables the reference plate 3 to move on the master mold 2, thereby allowing the reference plate 3 to move between a first position and a second position. In other embodiments, the reference plate 3 can also be rotatably mounted on the master mold 2 and also have a first position and a second position, and the reference plate 3 can rotate between the first position and the second position.

[0041] Further, if Figures 1 to 4 As shown, the mother mold 2 is further provided with a first stopper 23. When the reference plate 3 moves from the second position to the first position, the reference plate 3 abuts against the first stopper 23. With this arrangement, the first stopper 23 limits the reference plate 3 when it moves to the first position, preventing the reference plate 3 from exceeding the first position. This allows the reference plate 3 to accurately remain in the first position and remain fixed relative to the mother mold 2. When placing a tube to be formed, one end of the tube to be formed can stably abut against the reference plate 3 in this position, thereby achieving the positioning function of the reference plate 3 for the tube to be formed.

[0042] Further, if Figure 1 and Figure 2 As shown, when the male mold 1 moves from the separation position to the forming position, the male mold 1 drives the reference plate 3 to move from the first position to the second position. Specifically, in this embodiment, when the male mold 1 and the female mold 2 are in the separation position, the reference plate 3 is in the first position. At this time, the pipe to be formed is placed on the female mold 2, and then the male mold 1 is fastened. During the fastening process, the male mold 1 drives the reference plate 3 to slide on the female mold 2. The reference plate 3 moves from the first position to the second position and exposes the pipe opening of the pipe to be formed, preparing for subsequent forming work. In other embodiments, the male mold 1 can also drive the reference plate 3 to rotate on the female mold 2, and the reference plate 3 rotates from the first position to the second position and exposes the pipe opening of the pipe to be formed. A separate driving mechanism, such as a cylinder, can also be provided to drive the movement of the reference plate 3.

[0043] Furthermore, if Figure 1 、 Figure 2 and Figure 5 As shown, the male mold 1 includes a male mold body 12 and a plurality of pressure plates 13 disposed on the male mold body 12. The plurality of pressure plates 13 are spaced apart along the length of the reference plate 3. When the male mold 1 moves from the separation position to the forming position, the plurality of pressure plates 13 abut against the reference plate 3 and drive the reference plate 3 from the first position to the second position. With this arrangement, when the male mold 1 and the female mold 2 are engaged, the plurality of pressure plates 13 can drive the movement of the reference plate 3 to ensure the stability of the movement direction of the reference plate 3. It should be noted that in this embodiment, the number of pressure plates 13 is set to two. In other embodiments, the number of pressure plates 13 can be determined based on actual conditions and is not limited here.

[0044] The pressing plate 13 is detachably connected to the male mold body 12 . Specifically, the pressing plate 13 is clamped on the male mold body 12 , which facilitates the maintenance and replacement of the pressing plate 13 in the future.

[0045] Further, if Figure 1 As shown, the molding die with a positioning function also includes an elastic member 6, which is connected between the female mold 2 and the reference plate 3. The elastic member 6 is configured to ensure that the reference plate 3 always has a tendency to move toward the first position. With this arrangement, when the male mold 1 is in the separated position, the elastic member 6 can ensure that the reference plate 3 automatically reaches the first position and positions the tube to be formed. The first position reached by the reference plate 3 is consistent each time, eliminating the need for manual positional intervention on the reference plate 3, thereby improving work efficiency and ensuring positioning accuracy. It should be noted that in this embodiment, the number of elastic members 6 is set to two. In other embodiments, the number of elastic members 6 can be determined based on actual conditions and is not limited here.

[0046] Furthermore, if Figures 2 to 4 As shown, the elastic member 6 is a compression spring 61. The mother mold 2 is also provided with a guide rod 24. The reference plate 3 has a guide hole 31 defined therein. The guide rod 24 is inserted into the guide hole 31. The compression spring 61 is sleeved onto the guide rod 24, with its ends abutting against the mother mold 2 and the reference plate 3, respectively. In this embodiment, the elastic deformation of the compression spring 61 provides the driving force for the movement of the reference plate 3, resulting in a simple and reliable structure and low manufacturing cost. The guide rod 24 serves as a guide, and the reference plate 3 slides axially along the guide rod 24, thereby ensuring a relatively stable sliding process for the reference plate 3. In this embodiment, the number of guide rods 24 matches the number of compression springs 61, both being two.

[0047] Among them, when the pressure plate 13 is facing the guide rod 24, the guide rod 24 is fixedly connected to the mother mold 2, and the pressure plate 13 drives the reference plate 3 to slide more smoothly. At this time, a groove is opened on the pressure plate 13, and the groove space can at least accommodate part of the guide rod 24 to avoid interference between the pressure plate 13 and the guide rod 24 to affect the sliding of the reference plate 3.

[0048] Alternatively, as Figure 5 and Figure 6 As shown, a positioning boss 14 is protruding from the wall of the first cavity 11 or the wall of the second cavity 21. Specifically, in this embodiment, a positioning boss 14 is provided on the wall of the first cavity 11. During the hydroforming process of the tubular component to be formed within the forming chamber 4, the outer wall of the tubular component to be formed contacts the positioning boss 14. As high-pressure liquid is continuously injected, a positioning recess is formed on the outer wall of the tubular component after it is formed, corresponding to the positioning boss 14. This positioning recess is generally located in the section of the tubular component to be cut after it is formed. In other embodiments, a positioning boss 14 may also be provided on the wall of the second cavity 21.

[0049] like Figure 7As shown, in the subsequent cutting operation, the section to be cut needs to be cut, and when cutting the formed pipe fitting, a cutting positioning member 9 is also required to assist. The cutting positioning member 9 includes a cutting positioning head 91, and a positioning groove 911 is provided on the cutting positioning head 91. In this embodiment, the cutting operation is a laser cutting operation, and the cutting positioning member 9 is a laser cutting positioning head. During the cutting operation, since the cross-sectional shape of the cutting positioning head 91 is consistent with the cross-sectional shape of the section to be cut of the formed pipe fitting, the cutting positioning head 91 can be inserted into the interior of the formed pipe fitting, and the outer wall of the cutting positioning head 91 can move along the inner wall of the formed pipe fitting. After the positioning groove 92 moves to the position of the positioning recess, and the groove wall of the positioning groove 92 abuts against the outer surface of the positioning recess, the cutting position is reached, and then the cutting operation is performed. Since the cutting positioning head 91 is inside the formed pipe and the positioning defect is in abutment with the positioning groove 92, the cutting positioning piece 9 can limit the rotation of the formed pipe, that is, the formed pipe is not easy to twist during the cutting process, and thus the formed pipe is more stable during the cutting process, thereby making the end face of the cut pipe smoother and improving the cutting quality.

[0050] Furthermore, if Figure 6 As shown, the positioning boss 14 is set to a plane on the side facing the pipe to be formed, and the plane of the positioning boss 14 is used to abut the outer wall of the pipe during hydraulic forming. Such a setting can reduce the risk of rupture of the outer wall of the pipe after forming, and will not affect the normal abutment and fit between the positioning groove 911 in the cutting positioning head 91 and the positioning recess.

[0051] Alternatively, as Figures 2 to 4 As shown, the mother mold 2 further defines a positioning hole 25, and the reference plate 3 further defines a latch hole 32. The positioning mold further includes a latch 7. When the reference plate 3 moves to the second position, the latch 7 passes through the latch hole 32 and engages with the positioning hole 25, thereby fixing the relative position of the reference plate 3 and the mother mold 2. This arrangement utilizes the latch 7 to secure the reference plate 3 in the second position, preventing collision between the reference plate 3 and other components during the hydroforming process.

[0052] Alternatively, as Figure 2 and Figure 5 As shown, the male mold 1 is also provided with a second limiter 8, which is connected to the male mold body 12. The second limiter 8 is used to limit the sealing plug for injecting high-pressure liquid to prevent the sealing plug from entering the pipe to be formed for too long, thereby causing the molding of the positioning recess to fail, and to prevent the sealing plug from colliding with the mold.

[0053] This embodiment also provides a bicycle tube fitting. The bicycle tube fitting comprises a central active section and sections to be cut at both ends of the active section. The bicycle tube fitting is formed by processing the tube to be formed using a forming die with a positioning function. Because the length of the sections to be cut is consistent after each forming process, the formed tube can directly meet the cutting and positioning requirements, eliminating the need for additional cutting of the inactive sections, thereby reducing the manufacturing cost of the tube fitting. In this embodiment, the cutting operation is laser cutting, assisted by a cutting positioning member 9.

[0054] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A molding die with positioning function, characterized in that: include: A male mold (1), wherein the male mold (1) is provided with a first mold cavity (11); A female mold (2), wherein the female mold (2) is provided with a second mold cavity (21), and the male mold (1) has a molding position for engaging with the female mold (2) and a separation position for separating from the female mold (2); when the male mold (1) is located at the molding position, the first mold cavity (11) and the second mold cavity (21) together enclose a molding chamber (4), and both ends of the molding chamber (4) are connected to the outside world; the molding chamber (4) is used to place a pipe to be molded; A reference plate (3), wherein the reference plate (3) is movably arranged on the mother mold (2) and the reference plate (3) can move relative to the mother mold (2) and has a first position and a second position; when the reference plate (3) is located at the first position, the reference plate (3) is located at one end of the molding chamber (4) and is used to abut against one end of the tube to be molded; when the reference plate (3) is located at the second position, the reference plate (3) is separated from one end of the molding chamber (4).

2. A molding die with positioning function according to claim 1, characterized in that: The master mold (2) is slidably connected to the reference plate (3); one of the master mold (2) and the reference plate (3) is provided with a slide groove (22), and the other is provided with a slider (5); the slider (5) is slidably connected to the slide groove (22).

3. A molding die with positioning function according to claim 2, characterized in that: The female mold (2) is further provided with a first position-limiting member (23); when the reference plate (3) moves from the second position to the first position, the reference plate (3) abuts against the first position-limiting member (23).

4. The molding die with positioning function according to claim 2, characterized in that: When the male mold (1) moves from the separation position to the molding position, the male mold (1) drives the reference plate (3) to move from the first position to the second position.

5. The molding die with positioning function according to claim 4, characterized in that: The male mold (1) comprises a male mold body (12) and a plurality of pressure plates (13) arranged on the male mold body (12), wherein the plurality of pressure plates (13) are arranged at intervals along the length direction of the reference plate (3); when the male mold (1) moves from the separation position to the forming position, the plurality of pressure plates (13) abut against the reference plate (3) and drive the reference plate (3) to move from the first position to the second position.

6. The molding die with positioning function according to claim 2, characterized in that: The molding die with a positioning function further comprises an elastic member (6), wherein the elastic member (6) is connected between the mother die (2) and the reference plate (3), and the elastic member (6) is configured to ensure that the reference plate (3) always has a tendency to move toward the first position.

7. The molding die with positioning function according to claim 6, characterized in that: The elastic member (6) is a compression spring (61), the mother mold (2) is further provided with a guide rod (24), the reference plate (3) is provided with a guide hole (31), the guide rod (24) is inserted into the guide hole (31), the compression spring (61) is sleeved on the guide rod (24), and the two ends of the compression spring (61) are respectively in contact with the mother mold (2) and the reference plate (3).

8. A molding die with positioning function according to any one of claims 1 to 7, characterized in that: A positioning boss (14) is protruding from the cavity wall of the first cavity (11) or the cavity wall of the second cavity (21).

9. A molding die with a positioning function according to any one of claims 1 to 7, characterized in that: The mother mold (2) is further provided with a positioning hole (25), and the reference plate (3) is further provided with a latch hole (32). The molding die with a positioning function further comprises a latch (7). When the reference plate (3) moves to the second position, the latch (7) passes through the latch hole (32) and is plugged into the positioning hole (25) to fix the relative position of the reference plate (3) and the mother mold (2).

10. A bicycle pipe, characterized in that: The bicycle tube comprises an effective section in the middle and sections to be cut located at both ends of the effective section. The bicycle tube is formed by processing the tube to be formed through the forming mold with positioning function according to any one of claims 1 to 9.

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