A mould for forming a carbon fibre bicycle frame

Abstract

This utility model relates to a molding die for a carbon fiber bicycle frame, including a top die, a bottom die, and an intermediate die disposed between the top die and the bottom die. The intermediate die includes an upper core, a lower core, a left core, and a right core, which are distributed circumferentially and can be spliced ​​together adjacent to each other. The upper core, lower core, left core, and right core are slidably assembled to the bottom die through pre-set grooves on the bottom die. The cavity formed by the top die, bottom die, upper core, lower core, left core, and right core constitutes the molding cavity of the frame. This embodiment adds an intermediate die, setting the intermediate die as a four-sided core that can be spliced ​​together. Moreover, each side core is slidably assembled through a corresponding groove on the bottom die, and together with the corresponding positioning structure on the top die, they form an overall molding cavity. This reduces the design and processing difficulty of the overall cavity, and only requires disassembly and replacement of the corresponding damaged core, reducing maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of carbon fiber bicycle frame manufacturing technology, and in particular to a molding die for carbon fiber bicycle frames. Background Technology

[0002] Currently, carbon fiber frames used in foldable electric bicycles mostly employ an air-molding process. This involves combining a pre-molded carbon fiber prepreg with an inflatable inner liner, placing it between a top mold and a bottom mold, closing the mold, inflating it to make the prepreg expand and fit tightly into the cavity, and then heating and curing it to form the final shape. However, existing two-part molds are difficult to adapt to the increasingly complex structural features of frames (such as complex curved contours, hollow structures, and folding joint mounting positions). Not only is the design and manufacturing of the overall cavity difficult and costly, but if the cavity is worn or damaged, it cannot be repaired individually and requires complete rework or replacement, resulting in high maintenance costs. Therefore, there is an urgent need for a molding die that can adapt to complex structures and is easy to maintain. Summary of the Invention

[0003] Therefore, it is necessary to provide a molding die for carbon fiber bicycle frames.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A molding die for a carbon fiber bicycle frame includes a top die, a bottom die, and an intermediate die disposed between the top die and the bottom die. The intermediate die includes an upper core, a lower core, a left core, and a right core that are distributed circumferentially and can be spliced ​​together adjacent to each other. The upper core, lower core, left core, and right core are slidably assembled to the bottom die through a pre-set groove on the bottom die. The cavity formed by the top die, bottom die, upper core, lower core, left core, and right core constitutes the molding cavity of the frame.

[0005] Furthermore, the lower core is provided with a convex arc portion forming the inner cavity of the frame. The head of the convex arc portion and the connection between the upper core are provided with guide grooves to guide the positioning of the two. The guide groove wall on one side of the upper core is recessed inward to form an opening communicating with the inner cavity of the frame.

[0006] Furthermore, the lower core includes a first lower module and a second lower module that together form the convex arc portion. The head of the first lower module is provided with the guide groove. The second lower module includes a first insert and a second insert that can be detachably assembled. The first insert and the second insert together form an installation channel for installing the air nozzle pipe on the vehicle frame.

[0007] Furthermore, the first lower module is detachably fixed to the bottom mold by means of a pin passing through a pre-set pin hole between the first lower module and the bottom mold.

[0008] Furthermore, the lower core also includes a separable third insert, a fourth insert, and a tube. The third insert is slidably mounted on the bottom mold. The third insert and the fourth insert are connected to the second lower module. The third insert and the fourth insert together form a through hole. The tube passes through the through hole and its two ends abut against the hole wall of the through hole and the positioning groove preset in the bottom mold, respectively.

[0009] Furthermore, the left core includes a fifth insert and a sixth and a seventh insert located at both ends of the fifth insert. The sixth insert engages with the fifth insert and the lower mold core, respectively, and the seventh insert is slidably assembled on the bottom mold and tightly engaged with the fifth insert.

[0010] Furthermore, the upper core and the seventh insert are respectively provided with limiting annular grooves for limiting the side of the insertion tube, and the limiting annular grooves are adapted to the outer diameter of the insertion tube.

[0011] Furthermore, the right-side core includes an eighth insert, a ninth insert, a bottom insert, and a top insert. The bottom insert is assembled between the bottom mold and the eighth insert, and the top insert is assembled between the eighth insert and the ninth insert. One end of the top insert passes through the inner hole of the lower core and is positioned within the positioning hole of the upper core. The top insert is clearance-fitted with the inner hole of the lower core.

[0012] Furthermore, the bottom mold has a snap-fit ​​groove in the area where the top insert rod is provided on the upper core, which allows an external snap-fit ​​block to engage with it. The snap-fit ​​block is tightly pressed against the side wall of the upper core.

[0013] Furthermore, the side wall of the bottom mold is provided with a first positioning block for pre-positioning the preset through hole of the frame, and the side wall of the top mold is provided with a second positioning block for cooperating with the first positioning block to position and calibrate the through hole of the frame.

[0014] By adopting the above technical solution, the present invention has at least the following beneficial effects: The present invention adds an intermediate mold between the top mold and the bottom mold, and sets the intermediate mold as an upper core, a lower core, a left core, and a right core that can be spliced ​​and matched. Moreover, each core is slidably assembled through a corresponding groove on the bottom mold, and together with the corresponding positioning structure on the top mold, they form an integral molding cavity. In this way, each core can be adapted and adjusted to meet the complex structural features around the frame, thereby reducing the design and processing difficulty of the overall cavity, effectively meeting the molding requirements of complex structures, and when the cavity is locally worn or damaged, only the corresponding damaged core needs to be disassembled and replaced, which can reduce maintenance costs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the combined state of an optional embodiment of the molding die for carbon fiber bicycle frames according to the present invention; Figure 2 This is a schematic diagram of the structure of a mold for forming carbon fiber bicycle frames according to an optional embodiment of the present invention, showing the removal of the top mold. Figure 3 This is a schematic diagram of the structure of an optional embodiment of the molding die for carbon fiber bicycle frames of this utility model, showing the disassembly of the intermediate mold; Figure 4 This is a schematic diagram of the structure of the first lower module of an optional embodiment of the molding die for carbon fiber bicycle frames according to this utility model; Figure 5 This is a schematic diagram of the bottom mold of an optional embodiment of the molding die for carbon fiber bicycle frames according to the present invention.

[0017] In the attached diagram: 1. Top mold; 11. Second positioning block; 2. Bottom mold; 20. Insert groove; 21. Positioning groove; 22. Locking block; 23. Locking groove; 24. First positioning block; 25. Pin hole; 3. Upper core; 30. Recessed part; 31. Positioning hole; 33. Limiting ring groove; 4. Lower core; 40. Convex arc part; 41. Guide groove; 42. First lower mold; 420. Pin; 43. Second lower mold Blocks; 43a, First insert; 43b, Second insert; 44, Mounting channel; 45, Third insert; 46, Fourth insert; 47, Insert tube; 48, Through hole; 49, Inner hole; 5, Left core; 51, Fifth insert; 52, Sixth insert; 53, Seventh insert; 6, Right core; 61, Eighth insert; 62, Ninth insert; 63, Bottom insert rod; 64, Top insert rod; 100, Frame. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other. The technical solutions of the present invention will be further described below with reference to the accompanying drawings of the embodiments. The present invention is not limited to the specific embodiments described below.

[0019] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "front," "rear," "left," "right," "top," and "bottom" 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 component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms describing positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0020] like Figures 1-5 As shown, an optional embodiment of this utility model provides a molding die for a carbon fiber bicycle frame, including a top mold 1, a bottom mold 2, and an intermediate mold disposed between the top mold 1 and the bottom mold 2. The intermediate mold includes an upper core 3, a lower core 4, a left core 5, and a right core 6 distributed circumferentially and capable of being spliced ​​together. The upper core 3, lower core 4, left core 5, and right core 6 are slidably assembled to the bottom mold 2 through a pre-set groove 20 on the bottom mold 2. The cavity formed by the top mold 1, bottom mold 2, upper core 3, lower core 4, left core 5, and right core 6 constitutes the molding cavity of the frame 100.

[0021] This embodiment of the invention adds an intermediate mold between the top mold 1 and the bottom mold 2. The intermediate mold is configured as an upper core 3, a lower core 4, a left core 5, and a right core 6 that can be spliced ​​together. Each core is slidably assembled through a corresponding groove 20 on the bottom mold 2, and together with the corresponding positioning structure on the top mold 1, they form an integral molding cavity. In this way, each core can be adapted and adjusted to meet the complex structural features around the frame 100, thereby reducing the design and processing difficulty of the overall cavity, effectively meeting the molding requirements of complex structures. Moreover, when the cavity is locally worn or damaged, only the corresponding damaged core needs to be disassembled and replaced, which can reduce maintenance costs.

[0022] In one optional embodiment of this utility model, such as Figures 1-5As shown, the lower core 4 is provided with a convex arc portion 40 forming the inner cavity of the frame 100. A guide groove 41 is provided at the junction of the head of the convex arc portion 40 and the upper core 3 to guide their positioning. The guide groove 41 on one side of the upper core 3 has an inwardly recessed wall for forming an opening communicating with the inner cavity of the frame 100. In this embodiment, by providing a guide groove 41 at the junction of the head of the convex arc portion 40 and the upper core 3, a tight fit between the splicing surfaces of the upper core 3 and the lower core 4 can be ensured. Furthermore, by providing a recessed portion 30 on the wall of the guide groove 41 on one side of the upper core 3, an opening structure communicating with the inner cavity can be integrally formed during the frame 100 forming process, facilitating structural forming.

[0023] In one optional embodiment of this utility model, such as Figures 1-5 As shown, the lower core 4 includes a first lower module 42 and a second lower module 43 that together form the convex arc portion 40. The head of the first lower module 42 is provided with the guide groove 41. The second lower module 43 includes a first insert 43a and a second insert 43b that can be separably assembled. The first insert 43a and the second insert 43b enclose and form an installation channel 44 for the air nozzle pipe on the frame 100. In this embodiment, by further dividing the lower core 4 into the first lower module 42 and the second lower module 43 that together form the convex arc portion 40, it is convenient to process the convex arc contours of different areas of the inner cavity of the frame 100, reducing the manufacturing difficulty. In addition, by setting the second lower module 43 as a separable first insert 43a and a second insert 43b, the two together form the installation channel 44 for the air nozzle pipe of the frame 100, which facilitates the demolding operation of the air nozzle pipe after molding and reduces damage to the carbon fiber frame 100 during demolding.

[0024] In one optional embodiment of this utility model, such as Figures 1-5 As shown, the first lower module 42 is detachably fixed to the bottom mold 2 by means of a pin 420 passing through a pre-set pin hole 25 between the first lower module 42 and the bottom mold 2. In this embodiment, by using a detachable fixing method where the pin 420 passes through the pre-set pin hole 25 between the first lower module 42 and the bottom mold 2, displacement of the first lower module 42 can be prevented during mold closing, inflation, and heating curing, thus ensuring the forming accuracy of the convex arc portion 40.

[0025] In one optional embodiment of this utility model, such as Figures 1-5As shown, the lower core 4 includes a detachable third insert 45, a fourth insert 46, and a tube 47. The third insert 45 is slidably mounted on the bottom mold 2. The third insert 45 and the fourth insert 46 are connected to the second lower module 43. The third insert 45 and the fourth insert 46 enclose a through hole 48. The tube 47 passes through the through hole 48 and its two ends abut against the hole wall of the through hole 48 and the positioning groove 21 preset in the bottom mold 2, respectively. In this embodiment, the through hole 48 is formed by the third insert 45 and the fourth insert 46, and the tube 47 passes through the through hole 48 and its two ends abut against the hole wall and the positioning groove 21 preset in the bottom mold 2, respectively. In this way, the tube 47 can be used to form the through structure on the frame 100 corresponding to the vertical tube of the frame 100 that needs to be installed, and it also facilitates mold assembly and demolding operations.

[0026] In one optional embodiment of this utility model, such as Figures 1-5 As shown, the left core 5 includes a fifth insert 51 and a sixth insert 52 and a seventh insert 53 located at both ends of the fifth insert 51. The sixth insert 52 engages with the fifth insert 51 and the lower mold core, respectively. The seventh insert 53 is slidably assembled on the bottom mold 2 and tightly engaged with the fifth insert 51. In this embodiment, by dividing the left core 5 into a fifth insert 51 and a sixth insert 52 and a seventh insert 53 located at both ends of it, the sixth insert 52 engages with the fifth insert 51 and the lower core 4, and the seventh insert 53 tightly engages with the fifth insert 51, which effectively improves the fit between the left core 5 and the contour of the frame 100.

[0027] In one optional embodiment of this utility model, such as Figures 1-5 As shown, the upper core 3 and the seventh insert 53 have corresponding limiting annular grooves 33 on their opposite surfaces for limiting the side of the insertion tube 47. The limiting annular grooves 33 are adapted to the outer diameter of the insertion tube 47. In this embodiment, by opening limiting annular grooves 33 that are adapted to the outer diameter of the insertion tube 47 on the opposite surfaces of the upper core 3 and the seventh insert 53, the rotation or shaking of the insertion tube 47 is restricted, ensuring that the insertion tube 47 always maintains the preset positional accuracy.

[0028] In one optional embodiment of this utility model, such as Figures 1-5As shown, the right-side core 6 includes an eighth insert 61, a ninth insert 62, a bottom insert 63, and a top insert 64. The bottom insert 63 is assembled between the bottom mold 2 and the eighth insert 61, and the top insert 64 is assembled between the eighth insert 61 and the ninth insert 62. One end of the top insert 64 passes through the inner hole 49 of the lower core 4 and is positioned within the positioning hole 31 of the upper core 3. The top insert 64 and the inner hole 49 of the lower core 4 are in clearance fit. In this embodiment, by assembling the bottom insert 63 between the bottom mold 2 and the eighth insert 61, the positioning and fixing of the eighth insert 61 on the bottom mold 2 can be quickly achieved. The top insert 64 passes through the eighth insert 61 and the ninth insert 62 and through the inner hole 49 of the lower core 4, and is finally positioned within the positioning hole 31 of the upper core 3 to avoid displacement during mold closing or molding, thus accurately molding the right-side structure of the frame 100.

[0029] In one optional embodiment of this utility model, such as Figures 1-5 As shown, the bottom mold 2 has a snap-fit ​​groove 23 in the area corresponding to the top insertion rod 64 of the upper core 3, which allows the external snap-fit ​​block 22 to engage. The snap-fit ​​block 22 abuts tightly against the side wall of the upper core 3. In this embodiment, by opening the snap-fit ​​groove 23 in the area of ​​the bottom mold 2 corresponding to the top insertion rod 64 of the upper core 3, and cooperating with the external snap-fit ​​block 22 to engage with the snap-fit ​​groove 23 and abut tightly against the side wall of the upper core 3, the installation stability of the upper core 3 is ensured.

[0030] In one optional embodiment of this utility model, such as Figures 1-5 As shown, the side wall of the bottom mold 2 is provided with a first positioning block 24 for pre-positioning the preset through holes of the frame 100, and the side wall of the top mold 1 is provided with a second positioning block 11 for cooperating with the first positioning block 24 to position and calibrate the through holes of the frame 100. In this embodiment, by setting the first positioning block 24 and the second positioning block 11, preliminary positioning can be quickly achieved during the placement stage of the frame (carbon fiber prepreg semi-finished product). After the mold is closed, the second positioning block 11 cooperates with the first positioning block 24 to calibrate the position of the through holes, thereby improving the forming accuracy of the carbon fiber frame 100 assembly structure.

[0031] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. 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 molding die for a carbon fiber bicycle frame, comprising a top die and a bottom die, characterized in that, The molding die also includes an intermediate die disposed between the top die and the bottom die. The intermediate die includes an upper core, a lower core, a left core, and a right core that are distributed circumferentially and can be spliced ​​together. The upper core, lower core, left core, and right core are slidably assembled to the bottom die through a pre-set groove on the bottom die. The cavity formed by the top die, bottom die, upper core, lower core, left core, and right core constitutes the molding cavity of the frame.

2. The molding die for a carbon fiber bicycle frame according to claim 1, characterized in that, The lower core has a convex arc portion forming the inner cavity of the frame. The head of the convex arc portion and the connection between the upper core are provided with guide grooves to guide the positioning of the two. The guide groove wall on one side of the upper core is recessed inward to form an opening communicating with the inner cavity of the frame.

3. The molding die for a carbon fiber bicycle frame according to claim 2, characterized in that, The lower core includes a first lower module and a second lower module that together form the convex arc portion. The head of the first lower module is provided with the guide groove. The second lower module includes a first insert and a second insert that can be detachably assembled. The first insert and the second insert together form an installation channel for the air nozzle pipe on the vehicle frame.

4. The molding die for a carbon fiber bicycle frame according to claim 3, characterized in that, The first lower module is detachably fixed to the bottom mold by means of a pin passing through a pre-set pin hole between the first lower module and the bottom mold.

5. The molding die for a carbon fiber bicycle frame according to claim 3, characterized in that, The lower core also includes a separable third insert, a fourth insert, and a tube. The third insert is slidably mounted on the bottom mold. The third insert and the fourth insert are connected to the second lower module. The third insert and the fourth insert together form a through hole. The tube passes through the through hole and its two ends abut against the hole wall of the through hole and the positioning groove of the bottom mold, respectively.

6. The molding die for a carbon fiber bicycle frame according to claim 5, characterized in that, The left core includes a fifth insert and a sixth and a seventh insert located at both ends of the fifth insert. The sixth insert engages with the fifth insert and the lower mold core, respectively. The seventh insert is slidably assembled on the bottom mold and tightly engaged with the fifth insert.

7. The molding die for a carbon fiber bicycle frame according to claim 6, characterized in that, The upper core and the seventh insert are respectively provided with limiting annular grooves for limiting the side of the insertion tube, and the limiting annular grooves are adapted to the outer diameter of the insertion tube.

8. The molding die for a carbon fiber bicycle frame according to claim 1, characterized in that, The right-side core includes an eighth insert, a ninth insert, a bottom insert, and a top insert. The bottom insert is assembled between the bottom mold and the eighth insert, and the top insert is assembled between the eighth insert and the ninth insert. One end of the top insert passes through the inner hole of the lower core and is positioned within the positioning hole of the upper core. The top insert is clearance-fitted with the inner hole of the lower core.

9. The molding die for a carbon fiber bicycle frame according to claim 8, characterized in that, The bottom mold has a snap-fit ​​groove in the area where the top insert rod is located on the upper core, which allows for the engagement of an external snap-fit ​​block. The snap-fit ​​block is tightly pressed against the side wall of the upper core.

10. The molding die for a carbon fiber bicycle frame according to claim 1, characterized in that, The bottom mold has a first positioning block protruding from its side wall for pre-positioning the pre-set through hole of the frame, and the top mold has a second positioning block protruding from its side wall for cooperating with the first positioning block to position and calibrate the through hole of the frame.

Images