Bicycle tube stamping dies
By using the punch and die components of the bicycle tube stamping die and utilizing the arc structure of the cutting edge to perform secondary stamping on the radius (R) of the tube, the problem of insufficient sharpness in the forming of concave and convex lettering on the surface of the bicycle tube is solved, and a clear visual effect of sharp edges is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GIANT BICYCLES
- Filing Date
- 2025-07-23
- Publication Date
- 2026-07-03
AI Technical Summary
The existing high-pressure molding process is insufficient in forming sharpness when making concave or convex letters on the surface of bicycle tubes, resulting in excessively large radius corners at the edges of the letters, making them blurry and affecting their appearance.
The bicycle tube stamping die, including a punch assembly and a die assembly, utilizes the arc structure of the cutting edge of the guard die and the pressing die to perform secondary stamping deformation on the R-angle of the tube, making it angular and with clearer edges.
It improves the sharpness of the fonts or logos on bicycle parts, meeting design requirements and enhancing the visual quality, making it suitable for designs that pursue a rugged style.
Smart Images
Figure CN224444335U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of metal stamping technology, and in particular to stamping dies for bicycle tube fittings. Background Technology
[0002] High-pressure forming technology for aluminum alloy tubing is widely used in bicycle manufacturing. This process uses hydraulic pressure to deform the tubing within a mold, enabling the high-pressure forming of complex cross-sectional shapes. However, in actual production, significant defects still exist when dealing with the fine features of the tubing surface.
[0003] Existing high-pressure molding processes generally face the problem of insufficient sharpness when creating recessed or raised lettering (such as brand logos, font markings, and specification information) on pipe fittings. Due to the limitations of material flow characteristics under high-pressure fluid, the rounded corners (radius corners) of the molded lettering edges are usually too large, resulting in blurred letter outlines, a lack of angularity, and an unattractive appearance.
[0004] Therefore, there is an urgent need for a stamping die for bicycle tube fittings to solve the above problems. Utility Model Content
[0005] The purpose of this utility model is to provide a stamping die for bicycle tube fittings, so that the fonts or logos on the tube fittings have sharp angles and clearer edges, thereby meeting design requirements and improving visual quality.
[0006] To address the aforementioned problems in the existing technology, this utility model adopts the following technical solution:
[0007] A stamping die for bicycle tubing includes a punch assembly and a die assembly. Both the punch assembly and the die assembly include a pressing die and a retaining die. The retaining die is elastically disposed on the pressing die and protrudes relative to the pressing die. A cutting edge arc is provided between the retaining die and the pressing die. The retaining die of the punch assembly abuts against the bottom wall and side wall of the tubing groove. The pressing die of the punch assembly abuts against one side of the tubing body, so that the cutting edge arc can reduce the R-angle of the tubing groove. The retaining die of the die assembly abuts against the other side of the tubing body and the outer side wall of the tubing protrusion. The pressing die of the die assembly abuts against the top of the tubing protrusion, so that the cutting edge arc can reduce the R-angle of the tubing protrusion.
[0008] When the punch assembly is located outside the pipe fitting, the die assembly is located inside the pipe fitting; when the punch assembly is located inside the pipe fitting, the die assembly is located outside the pipe fitting.
[0009] Preferably, the bicycle fitting stamping die further includes an elastic element, one end of which is connected to the die and the other end of which is connected to the protective mold.
[0010] Preferably, the mold has a groove, the elastic element is disposed in the groove, and the protective mold is slidably disposed in the groove.
[0011] Preferably, when the punch assembly is located outside the pipe, the contact surface shape of the die of the punch assembly is adapted to the outer surface contour of the pipe body.
[0012] Preferably, when the punch assembly is located in the inner cavity of the pipe, the contact surface shape of the die of the punch assembly is adapted to the inner surface contour of the pipe body, and the die of the punch assembly is an internal support die.
[0013] Preferably, when the die assembly is located in the inner cavity of the pipe, the contact surface shape of the protective mold of the die assembly is adapted to the inner surface contour of the pipe body, and the pressing mold of the die assembly is an inner support mold.
[0014] Preferably, when the die assembly is located outside the pipe, the contact surface shape of the protective mold of the die assembly is adapted to the outer surface contour of the pipe body.
[0015] Preferably, the retaining mold of the punch assembly and the pressing mold of the die assembly are in clearance fit.
[0016] Preferably, the die of the punch assembly and the retaining die of the die assembly are in clearance fit.
[0017] Preferably, the die assembly includes a fixed body, a punch, and a wedge. The fixed body abuts against the pipe body, the punch and the protective die are elastically disposed, and the punch abuts against the top of the protrusion of the pipe. The wedge is disposed between the fixed body and the punch, and the wedge can move along the axial direction of the pipe body to separate the punch from the protrusion of the pipe and the protective die from the pipe body.
[0018] The beneficial effects of this utility model are as follows:
[0019] This utility model provides a stamping die for bicycle tubing. The stamping die includes a punch assembly and a die assembly. Both the punch and die assemblies include a pressing die and a retaining die. The retaining die is elastically disposed on the pressing die and protrudes relative to the pressing die. There is a cutting edge arc between the retaining die and the pressing die. The retaining die of the punch assembly abuts against the bottom wall and side wall of the tubing groove, and the pressing die of the punch assembly abuts against one side of the tubing body, so that the cutting edge arc can reduce the R-angle of the tubing groove. The retaining die of the die assembly abuts against the other side of the tubing body and the outer side wall of the tubing protrusion, and the pressing die of the die assembly abuts against the top of the tubing protrusion, so that the cutting edge arc can reduce the R-angle of the tubing protrusion. When the punch assembly is placed in the inner cavity of the tubing, it forms a support. When the die assembly is placed on the outside of the tubing, an external force is applied to the end of the pressing die of the die assembly away from the tubing protrusion, and the cutting edge arc stamps and deforms the R-angle of the tubing protrusion. When the die assembly is placed inside the pipe fitting, it forms a support. The punch assembly is placed outside the pipe fitting. An external force is applied to the end of the punch assembly away from the groove in the pipe fitting. The arc of the cutting edge punches and deforms the radius (R) of the groove in the pipe fitting, making the R of the groove smaller. The convex or concave fonts or logos have sharp edges and clearer edges, meeting design requirements and enhancing visual texture, suitable for designs that pursue a tough style. Attached Figure Description
[0020] Figure 1 This is a first structural schematic diagram of a bicycle tube stamping die provided in an embodiment of the present utility model;
[0021] Figure 2 This is a schematic diagram of the second structure of the bicycle tube stamping die provided in an embodiment of the present invention.
[0022] Figure label:
[0023] 100. Fitting body; 200. Fitting groove; 300. Fitting protrusion;
[0024] 1. Pressing die; 2. Protective die; 3. Cutting edge arc; 4. Elastic element; 5. Groove; 6. Fixing body; 7. Punching die; 8. Angled block. Detailed Implementation
[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0027] 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.
[0028] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0029] like Figures 1-2 As shown, in this embodiment, the bicycle fitting stamping die includes a punch assembly and a die assembly. Both the punch assembly and the die assembly include a pressing die 1 and a retaining die 2. The retaining die 2 is elastically disposed on the pressing die 1 and protrudes relative to the pressing die 1. A cutting edge arc 3 is provided between the retaining die 2 and the pressing die 1. The retaining die 2 of the punch assembly abuts against the bottom wall and side wall of the fitting groove 200. The pressing die 1 of the punch assembly abuts against one side of the fitting body 100, so that the cutting edge arc 3 can reduce the R angle of the fitting groove 200. The retaining die 2 of the die assembly abuts against the other side of the fitting body 100 and the outer side wall of the fitting protrusion 300. The pressing die 1 of the die assembly abuts against the top of the fitting protrusion 300, so that the cutting edge arc 3 can reduce the R angle of the fitting protrusion 300. When the punch assembly is located on the outside of the pipe fitting, the die assembly is located inside the pipe fitting; when the punch assembly is located inside the pipe fitting, the die assembly is located on the outside of the pipe fitting.
[0030] For example, the outer surface of the bicycle fitting is formed by stamping in a convex or concave form to present fonts or logos. Taking the convex type as an example, the arcs of the two vertices of the convex part are the R angles. Taking the concave type as an example, the arcs of the two vertices of the groove 5 are the R angles.
[0031] It should be noted that, as Figure 1 As shown, the lettering or markings on the outer surface of the bicycle fitting are raised relative to the fitting body 100, i.e., the fitting protrusion 300, while the inner cavity of the fitting is recessed relative to the fitting body 100, i.e., the fitting groove 200. Similarly, it can be seen that... Figure 2 As shown, the font or mark on the outer surface of the fitting is recessed inward relative to the fitting body 100, i.e., the fitting groove 200, while the inner cavity of the fitting is raised relative to the fitting body 100, i.e., the fitting protrusion 300.
[0032] Taking outwardly convex pipe fittings as an example, such as Figure 1 As shown, the punch assembly is located inside the pipe fitting, and the die assembly is located outside the pipe fitting. One end face of the die 1 of the punch assembly abuts against the inner wall of the pipe fitting body 100, and the other end face of the die 1 of the punch assembly abuts against a portion of the contact surface of the inner circumferential surface of the pipe fitting body 100 surrounding the opening of the pipe fitting groove 200. The die 1 provides internal support for the pipe fitting body 100, thus preventing deformation. The retaining mold 2 of the punch assembly is located at the center of the die 1 of the punch assembly and protrudes outward. One end of the retaining mold 2 is elastically connected to the die 1, and the other end of the retaining mold 2 fills the pipe fitting groove 200. That is, the outer circumferential surface of the end of the retaining mold 2 abuts against the inner wall of the pipe fitting groove 200, and the top surface of the end of the retaining mold 2 abuts against the bottom of the pipe fitting groove 200. One end of the die 1 of the die assembly is used to apply external force, and the other end of the die 1 of the die assembly abuts against the top of the protrusion 300 of the pipe fitting. The protective die 2 of the die assembly is arranged around the outer periphery of the die 1, and the inner peripheral wall of the protective die 2 has a cutting edge arc 3 between it and the end face of the die 1. The R angle of the cutting edge arc 3 is R0.3. One end of the protective die 2 of the die assembly is elastically connected to the die 1, and the inner peripheral wall of the other end of the protective die 2 of the die assembly abuts against the outer peripheral wall of the protrusion 300 of the pipe fitting. The top surface of the other end of the protective die 2 abuts against the outer peripheral wall of the pipe fitting body 100.
[0033] The punch assembly is placed inside the tube to form a support, and the tube body 100 does not deform relative to the punch assembly. Then, the die assembly is placed on the outside of the tube, and an external force is applied to the end of the die 1 of the die assembly away from the tube protrusion 300. The cutting edge arc 3 performs secondary stamping deformation on the R angle of the tube protrusion 300, making the R angle of the tube protrusion 300 smaller, presenting sharp edges, and making the edges of the fonts or logos clearer, thus meeting the design requirements, improving the visual texture, and suitable for designs that pursue a tough style.
[0034] Taking the grooved type 5 pipe fitting as an example, such as Figure 2 As shown, the punch assembly is located on the outside of the pipe fitting, and the die assembly is located inside the pipe fitting. One end face of the die 1 of the die assembly abuts against the inner wall of the pipe fitting body 100, and the other end face of the die 1 of the die assembly abuts against the top of the protrusion 300 of the pipe fitting. The die 1 is supported from the inside of the pipe fitting body 100, thus preventing deformation. The protective die 2 of the die assembly is arranged in a ring around the center of the die 1. One end of the protective die 2 is elastically connected to the die 1, and the inner peripheral wall of the other end of the protective die 2 abuts against the outer wall of the protrusion 300 of the pipe fitting. The top surface of the other end of the protective die 2 abuts against the inner wall of the pipe fitting body 100. One end of the die 1 of the punch assembly is used to apply external force, and the other end of the die 1 abuts against a portion of the contact surface of the pipe body 100 surrounding the opening of the pipe groove 200. The retaining die 2 of the punch assembly is located at the center of the die 1 and protrudes outward. One end of the retaining die 2 is elastically connected to the die 1, and the other end of the retaining die 2 fills the pipe groove 200, that is, the outer peripheral surface of the end of the retaining die 2 abuts against the inner sidewall of the pipe groove 200, and the top surface of the end of the retaining die 2 abuts against the bottom of the pipe groove 200. There is a cutting edge arc 3 between the outer peripheral wall of the retaining die 2 of the punch assembly and the end face of the die 1, and the R angle of the cutting edge arc 3 is R0.3.
[0035] The die assembly is placed inside the tube to form a support, and the tube body 100 does not deform relative to the die assembly. Then, the punch assembly is placed on the outside of the tube, and an external force is applied to the end of the punch assembly away from the groove 200 of the tube. The cutting edge arc 3 performs secondary stamping deformation on the R-angle of the groove 200 of the tube, making the R-angle of the groove 200 of the tube smaller, presenting sharp edges, and making the edges of the fonts or logos clearer, thus meeting the design requirements, improving the visual texture, and suitable for designs that pursue a tough style.
[0036] Furthermore, referring to Figures 1-2 The bicycle tube stamping die also includes an elastic element 4, one end of which is connected to the die 1 and the other end of which is connected to the mold guard 2. The elastic element 4 is configured as a spring. For the punch assembly and the die assembly, the die 1 of the punch assembly is elastically connected to the mold guard 2 of the punch assembly through the elastic element 4, and the die 1 of the die assembly is elastically connected to the mold guard 2 of the die assembly through the elastic element 4.
[0037] Taking a convex-shaped pipe fitting as an example, under the elastic action of the elastic element 4, the retaining mold 2 of the punch assembly can maintain the wall thickness of the pipe fitting groove 200 relative to the pressing mold 1 of the punch assembly. Simultaneously, under the elastic action of the elastic element 4, the retaining mold 2 of the concave mold assembly can maintain the wall thickness of the outer wall of the pipe fitting body 100 near the protrusion 300 relative to the pressing mold 1 of the concave mold assembly. Taking a groove-type pipe fitting as an example, under the elastic action of the elastic element 4, the retaining mold 2 of the concave mold assembly can maintain the wall thickness of the inner wall of the pipe fitting body 100 near the protrusion 300 relative to the pressing mold 1 of the concave mold assembly. Simultaneously, under the elastic action of the elastic element 4, the retaining mold 2 of the punch assembly can maintain the wall thickness of the pipe fitting groove 200 relative to the pressing mold 1 of the punch assembly.
[0038] Furthermore, referring to Figures 1-2 The mold 1 has a groove 5, the elastic element 4 is disposed in the groove 5, and the protective mold 2 is slidably disposed in the groove 5.
[0039] For example, the elastic element 4 elastically extends and retracts within the groove 5 of the mold 1, and both ends of the elastic element 4 are respectively connected to the mold 1 and the protective mold 2. Under the action of external force, the elastic element 4 can extend or compress within the groove 5, so that the protective mold 2 can maintain the wall thickness at the position of the tube being stamped relative to the mold 1 under the elastic action of the elastic element 4.
[0040] Furthermore, referring to Figures 1-2 When the punch assembly is located on the outside of the pipe fitting, the contact surface shape of the die 1 of the punch assembly is adapted to the outer surface contour of the pipe fitting body 100. When the die assembly is located in the inner cavity of the pipe fitting, the contact surface shape of the die 2 of the die assembly is adapted to the inner surface contour of the pipe fitting body 100.
[0041] Taking the convex pipe fitting as an example, the punch assembly is located in the inner cavity of the pipe fitting. The part of the contact surface of the pipe fitting body 100 surrounding the opening of the pipe fitting groove 200 has an inwardly curved arc structure. The corresponding die 1 of the punch assembly is an inner support die. The contact surface of the die 1 of the punch assembly has an outwardly convex arc structure. The die assembly is located on the outside of the pipe fitting. The part of the contact surface of the pipe fitting body 100 near the outer peripheral wall of the pipe fitting protrusion 300 has an outwardly convex arc structure. The corresponding contact surface of the die 2 of the die assembly has an inwardly curved arc structure. Taking a groove-type pipe fitting as an example, the punch assembly is located on the outside of the pipe fitting. A portion of the contact surface of the pipe fitting body 100 surrounding the opening of the groove 200 has an outwardly convex arc-shaped structure. Correspondingly, the die 1 of the die assembly is an inner support die. The contact surface of the die 1 of the punch assembly has an inwardly curved arc-shaped structure. The die assembly is located inside the pipe fitting. A portion of the contact surface of the pipe fitting body 100 near the inner peripheral wall of the protrusion 300 has an inwardly curved arc-shaped structure. Correspondingly, the contact surface of the die 2 of the die assembly has an outwardly convex arc-shaped structure. Therefore, when stamping convex or concave pipe fittings, it is necessary to replace them with corresponding matching die assemblies and punch assemblies.
[0042] Furthermore, referring to Figures 1-2 The die protector 2 of the punch assembly and the die press 1 of the die cavity assembly are in clearance fit, and the die press 1 of the punch assembly and the die protector 2 of the die cavity assembly are in clearance fit.
[0043] Part of the contact surface of the pipe body 100 is located in the gap between the pressing mold 1 of the punch assembly and the protective mold 2 of the die assembly. The pipe protrusion 300 and the pipe groove 200 are located in the gap between the pressing mold 1 of the die assembly and the protective mold 2 of the punch assembly. Appropriately reducing the above gap restricts the movement of the pipe and makes the R angle closer to the design value of the mold.
[0044] Furthermore, referring to Figures 1-2 The die assembly includes a fixed body 6, a punch 7, and a wedge block 8. The fixed body 6 abuts against the pipe body 100. The punch 7 and the protective die 2 are elastically arranged, and the punch 7 abuts against the top of the pipe protrusion 300. The wedge block 8 is arranged between the fixed body 6 and the punch 7. The wedge block 8 can move along the axial direction of the pipe body 100, so that the punch 7 is separated from the pipe protrusion 300 and the protective die 2 is separated from the pipe body 100.
[0045] The wedge angle of the inclined block 8 is usually 30 to 45 degrees. An external force is applied to the end face of the inclined block 8 perpendicular to the extension direction of the spring. After the punch assembly is placed in the inner cavity of the pipe, the inclined block 8 is pushed, and the die 7 moves toward the protrusion 300 of the pipe and abuts against the protrusion 300. At the same time, the elastic element 4 is gradually compressed, so that the protective die 2 of the punch assembly abuts against the inner peripheral wall of the pipe body 100 near the protrusion 300 of the pipe. This ensures that the punch assembly provides good support inside the pipe body 100, can adapt to pipes of various sizes, and has a good stamping effect. After the stamping is completed, pull the inclined block 8, and the die 7 moves away from the protrusion 300 of the pipe fitting and separates from the protrusion 300 of the pipe fitting. At the same time, the elastic element 4 extends under its own elasticity, so that the protective die 2 of the punch assembly separates from the part of the contact surface of the pipe fitting body 100 near the inner peripheral wall of the protrusion 300 of the pipe fitting. The punch assembly of the inner cavity of the pipe fitting can be easily and quickly disassembled, which is convenient for demolding.
[0046] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A bicycle tube stamping die characterized by, The assembly includes a punch assembly and a die assembly. Both the punch assembly and the die assembly include a pressing die (1) and a retaining die (2). The retaining die (2) is elastically disposed on the pressing die (1) and protrudes relative to the pressing die (1). A cutting edge arc (3) exists between the retaining die (2) and the pressing die (1). The retaining die (2) of the punch assembly abuts against the bottom wall and side wall of the pipe fitting groove (200). The pressing die (2) of the punch assembly... 1) The die (3) abuts against one side of the pipe body (100) so that the cutting edge arc (3) can reduce the R angle of the pipe groove (200); the die (2) of the die assembly abuts against the other side of the pipe body (100) and the outer side wall of the pipe protrusion (300); the die (1) of the die assembly abuts against the top of the pipe protrusion (300) so that the cutting edge arc (3) can reduce the R angle of the pipe protrusion (300); When the punch assembly is located outside the pipe fitting, the die assembly is located inside the pipe fitting; when the punch assembly is located inside the pipe fitting, the die assembly is located outside the pipe fitting.
2. The bicycle tube stamping die of claim 1, wherein, The bicycle tube stamping die also includes an elastic element (4), one end of which is connected to the die (1), and the other end of which is connected to the protective die (2).
3. The bicycle tube stamping die of claim 2, wherein, The mold (1) has a groove (5), the elastic element (4) is disposed in the groove (5), and the protective mold (2) is slidably disposed in the groove (5).
4. The bicycle tube stamping die of claim 1, wherein, When the punch assembly is located outside the pipe, the contact surface shape of the die (1) of the punch assembly is adapted to the outer surface contour of the pipe body (100).
5. The bicycle tube stamping die of claim 1, wherein, When the punch assembly is located in the inner cavity of the pipe, the contact surface shape of the die (1) of the punch assembly is adapted to the inner surface contour of the pipe body (100), and the die (1) of the punch assembly is an inner support die.
6. The bicycle tube stamping die according to claim 1, characterized in that, When the die assembly is located in the inner cavity of the pipe, the contact surface shape of the protective mold (2) of the die assembly is adapted to the inner surface contour of the pipe body (100), and the pressing mold (1) of the die assembly is an inner support mold.
7. The bicycle tube stamping die of claim 1, wherein, When the die assembly is located outside the pipe, the contact surface shape of the protective mold (2) of the die assembly is adapted to the outer surface contour of the pipe body (100).
8. A bicycle tube stamping die according to any one of claims 1 to 7, wherein The retaining mold (2) of the punch assembly and the pressing mold (1) of the die assembly are in clearance fit.
9. A bicycle tube stamping die according to any one of claims 1 to 7, wherein, The die (1) of the punch assembly and the retaining die (2) of the die assembly are in clearance fit.
10. The bicycle tube stamping die of claim 1, wherein, The die (1) of the die assembly includes a fixed body (6), a punch (7), and a wedge (8). The fixed body (6) abuts against the pipe body (100). The punch (7) and the protective die (2) are elastically disposed, and the punch (7) abuts against the top of the pipe protrusion (300). The wedge (8) is disposed between the fixed body (6) and the punch (7). The wedge (8) can move along the axial direction of the pipe body (100) to separate the punch (7) from the pipe protrusion (300) and the protective die (2) from the pipe body (100).