Thermosetting forming die for rim

Abstract

The utility model relates to a thermosetting forming die for a rim, which comprises a plurality of die units which can be spliced or separated, an annular rim curing chamber is formed by splicing the plurality of die units, the thermosetting forming die further comprises a spoke hole pin and a spoke hole pin positioning device, and the spoke hole pin positioning device is fixedly arranged on the radial inner side of the rim curing chamber. The first end of the spoke hole pin is positioned and matched with the spoke hole pin positioning device, the second end of the spoke hole pin penetrates into the rim curing cavity, the second end of the spoke hole pin is used for forming a spoke hole in the rim, the spoke hole pin positioning device comprises a first positioning part, and the first positioning part is of an inclined supporting face structure; and the first positioning part is in contact fit with the circumferential side surface of the spoke hole pin to position the included angle of the spoke hole pin relative to the plane of the rim.

Description

Technical Field

[0001] This utility model relates to wheel manufacturing technology, specifically to a thermosetting mold for wheel rims. Background Technology

[0002] Figure 1 This diagram illustrates the structure of a common bicycle wheel 900, which includes a rim 100, a hub 800, and spokes 200 connecting the rim 100 and the hub. Figure 2 The connection structure between the rim 100 and the spokes 200 is shown. The rim 100 includes a spoke connection portion 101 at the radially inner end and a top 102 at the radially outer end. The spoke connection portion 101 is basically U-shaped. The spoke hole 103 is located at the curved position of the spoke connection portion 101, that is, at the innermost end of the spoke connection portion 101. The spoke hole 103 extends basically radially along the rim 100 (in some wheels, there is a slight angle between the plane of the spokes and the rim, and the spoke hole extends radially towards the center or slightly eccentrically in a basically radial direction depending on the different weaving methods of the spokes between the rim and the hub). When the spokes 200 are connected to the rim 100, the spokes 200 pass through the spoke hole 103, and a spoke joint 300 is connected to the end of the spoke 200 that extends into the rim 100. The other end of the spoke 200 is connected to the hub. The spokes 200 bear the tensile force, so that the spoke joint 300 is pressed against the edge of the spoke hole 103.

[0003] Existing wheel rims 100 are often manufactured using reinforcing materials such as carbon fiber. During manufacturing, a pre-form of the wheel rim is first created through lamination and molding. This pre-form is then placed in a thermosetting mold and cured to obtain the wheel rim 100. In older technologies, spoke holes 103 were typically drilled after the wheel rim 100 had cured. However, in recent years, to improve the load-bearing capacity of the spoke holes 103, some manufacturers pre-form the holes during the wheel rim pre-forming stage. In this case, a spoke hole pin needs to be added to the thermosetting mold during thermosetting. The spoke hole pin passes through the pre-formed hole, allowing the softened reinforcing fibers to surround the spoke hole pin and form the spoke hole 103. However, the positioning and limiting structures for the spoke hole pins in existing technologies are not yet perfect, often resulting in pin displacement and a low product yield. Utility Model Content

[0004] To address the above problems, this utility model proposes a thermosetting mold for wheel rims with optimized structure.

[0005] This utility model is achieved using the following technical solution:

[0006] This utility model proposes a thermosetting molding mold for a wheel rim, comprising several mold units that can be assembled or separated. The assembly of the mold units forms an annular wheel rim curing chamber. It also includes a spoke pin and a spoke pin positioning device. The spoke pin positioning device is fixedly disposed on the radial inner side of the wheel rim curing chamber. The first end of the spoke pin is positioned and fitted with the spoke pin positioning device, and the second end of the spoke pin penetrates into the wheel rim curing chamber. The second end of the spoke pin is used to form spoke holes on the wheel rim. The spoke pin positioning device includes a first positioning part, which is an inclined support surface structure. The first positioning part contacts and fits with the peripheral side of the spoke pin to position the angle between the spoke pin and the plane on which the wheel rim is located.

[0007] Preferably, the second end of the spoke hole pin is provided with a partially enlarged second head, the outer diameter of which is larger than the diameter of the spoke hole.

[0008] Preferably, the spoke pin positioning device further includes a second positioning part, which is a baffle structure. The second positioning part and the axial end face of the first end of the spoke pin are arranged opposite to each other to abut the axial end face and position the spoke pin relative to the wheel rim in its axial direction.

[0009] Preferably, the first positioning part and the second positioning part are connected to form a "T"-shaped limiting groove, and the first end of the spoke hole pin is provided with a partially enlarged first head, which is inserted into the limiting groove.

[0010] Preferably, the spoke hole pin positioning device is a detachable modular structure.

[0011] Preferably, the mold unit includes an upper mold and a lower mold, and the spoke hole pin positioning device is detachably fixedly connected to the lower mold.

[0012] Preferably, the wheel rim also includes an air bladder located in the wheel rim curing chamber, which is used to expand and open the inner wall of the wheel rim after inflation. The second end of the spoke hole pin faces the air bladder, so that the air bladder can push the spoke hole pin radially inward toward the wheel rim after inflation.

[0013] This invention offers the following advantages: It incorporates a spoke pin positioning device. The first positioning part of the device contacts and engages with the circumferential side of the spoke pin, positioning it at the desired angle. The second positioning part of the device abuts against the axial end face of the spoke pin, thus positioning it relative to the rim in its axial direction and determining the wall thickness of the rim's radial inner end. Under the positioning of this device, the spoke pin remains virtually stationary, improving the product manufacturing yield. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a wheel in the prior art;

[0015] Figure 2 This is a schematic diagram of the connection structure between the rim and spokes in existing technology;

[0016] Figure 3 This is a schematic diagram of the thermosetting mold for the wheel rim in the embodiment;

[0017] Figure 4 This is a cross-sectional view of the thermosetting molding die for the wheel rim in one embodiment (excluding the wheel rim preform);

[0018] Figure 5 This is a schematic diagram of removing the upper mold from the thermosetting mold of the wheel rim in the embodiment;

[0019] Figure 6 yes Figure 5 A magnified view of a section at point A in the middle;

[0020] Figure 7 This is a cross-sectional view of the thermosetting molding die for the wheel rim in the embodiment (secondly, including the wheel rim preform). Detailed Implementation

[0021] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0022] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0023] See Figure 3-7 As shown in the preferred embodiment of this utility model, a thermosetting molding mold for a wheel rim is provided, comprising several mold units that can be assembled or separated. Specifically, in this embodiment, the mold unit includes an upper mold 10, a lower mold 20, and several side sliders 30. The upper mold 10, lower mold 20, and several side sliders 30 are assembled to form an annular wheel rim curing chamber 40. Before being placed into the wheel rim curing chamber 40, the wheel rim undergoes basic molding pre-forming to form a wheel rim pre-form 50. During the curing process, the wheel rim pre-form 50 is placed in the wheel rim curing chamber 40 for heating. The thermoplastic wheel rim pre-form 50 can then be heated and finally cooled and cured to form the finished wheel rim. The wheel rim curing chamber 40 is also equipped with an inflatable airbag (not shown in the figure) for inflating and expanding to open the inner wall of the wheel rim, ensuring the formed shape of the wheel rim. The above thermosetting molding technology for wheel rims is prior art and will not be described in detail here.

[0024] Before being placed into the wheel rim curing chamber 40, the preformed wheel rim 50 has pre-drilled holes 51 at the corresponding spoke holes. These pre-drilled holes 51 are located radially inner at the wheel rim preformed wheel rim 50 and are through holes substantially along the radial direction of the preformed wheel rim 50. The spoke hole pin 1 passes through the pre-drilled hole 51. Specifically, the spoke hole pin positioning device 2 is fixedly disposed radially inner on the wheel rim curing chamber 40. In this embodiment, the spoke hole pin positioning device 2 is fixedly connected to the lower mold 20. The first end 11 of the spoke hole pin 1 is positioned and fitted with the spoke hole pin positioning device 2, and the second end 12 of the spoke hole pin 1 passes through the wheel rim curing chamber 40, thus passing through the pre-drilled hole 51. After the thermosetting mold begins heating, the softened reinforcing fibers will form spoke holes around the spoke hole pin 1.

[0025] In wheel construction, some spokes are arranged radially along the rim, while others are at an angle to the plane of the rim. This depends on the different weaving patterns of the spokes between the rim and the hub. If the spokes are to be set at an angle relative to the plane of the rim, then the spoke hole pin 1 also needs to be relatively tilted in the thermosetting mold to form the tilted spoke hole. For example... Figure 7 The spoke pin positioning device 2 includes a first positioning part 21, which is an inclined support surface structure. The first positioning part 21 and the peripheral side of the spoke pin 1 are in contact and cooperate, so that the spoke pin 1 can be positioned at the required angle after it is positioned and cooperated with the first positioning part 21.

[0026] In this embodiment, the spoke pin positioning device 2 is disposed on the lower die 20, and the first positioning part 21 supports the peripheral side of the spoke pin 1 in the direction of gravity. In other embodiments, partial spoke pin positioning devices can be provided on the upper die 10 and the lower die 20 respectively, and the spoke pin 1 is positioned by clamping the spoke pin 1 with these two partial spoke pin positioning devices.

[0027] The second end 12 of the spoke pin 1 has a partially enlarged second head 121. The outer diameter of the second head 121 is larger than the diameter of the spoke hole (or pre-made hole 51). The second end 12 of the spoke pin 1 faces the air bladder. After the air bladder is inflated, it will push the spoke pin 1 radially inward toward the rim. At this time, because the outer diameter of the second head 121 is larger than the diameter of the spoke hole (or pre-made hole 51), the spoke pin 1 will not come out of the rim preform 50. Moreover, under the push of the air bladder, the second head 121 will press on the rim preform 50, so that after the rim is formed, a groove 52 will be formed on the spoke hole, which makes it easier to install the spoke joint.

[0028] Furthermore, because the second head 121, propelled by the airbag, presses against the wheel rim preform 50, the wall thickness of the inner radial end of the wheel rim will be affected by the position of the second head 121. The closer the second head 121 is to the inner radial end of the wheel rim, the smaller the wall thickness of the inner radial end of the wheel rim. Therefore, limiting the position of the positioning spoke pin 1 relative to the wheel rim in its axial direction can better determine the wall thickness of the inner radial end of the wheel rim. In this embodiment, the spoke pin positioning device 2 also includes a second positioning part 22, which is a baffle structure. The second positioning part 22 is disposed opposite to the axial end face of the first end 11 of the spoke pin 1, and is used to abut against the axial end face of the first end 11 of the spoke pin 1 to position the spoke pin 1 relative to the wheel rim in its axial direction.

[0029] Understandably, the second positioning part 22 can be configured to be adjustable, thereby facilitating the adjustment of the wall thickness at the radial inner end of the wheel rim. For example, a screw can be provided on the second positioning part 22, and the position of it abutting the axial end face of the first end 11 of the spoke hole pin 1 can be adjusted by rotating the screw.

[0030] Furthermore, the spoke hole pin positioning device 2 can be configured as a detachable modular structure. For example, in this embodiment, the spoke hole pin positioning device 2 is a block structure threadedly connected to the lower die 20. Then, by replacing the spoke hole pin positioning device 2 of different specifications, different first positioning parts 21 and second positioning parts 22 can be quickly replaced. For example, the angle of the first positioning part 2 can be changed, and the axial position of the second positioning part 22 can be changed. Figure 4 Another feasible spoke pin positioning device 2' is also shown, which is directly integrally formed on the lower mold 20.

[0031] To further simplify the configuration of the spoke hole pin positioning device 2 and facilitate the insertion of the spoke hole pin 1 into the spoke hole pin positioning device 2, please refer to... Figure 6 and Figure 7 The first positioning part 21 and the second positioning part 22 are connected to form a "T"-shaped limiting groove. The first end of the spoke hole pin 1 is provided with a partially enlarged first head 111, which is inserted into the limiting groove.

[0032] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that any changes in form and detail made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims fall within the protection scope of the present invention.

Claims

1. A thermosetting mold for a wheel rim, comprising several mold units that can be assembled or separated, wherein the assembly of the several mold units forms an annular wheel rim curing chamber, characterized in that: It also includes a spoke pin and a spoke pin positioning device. The spoke pin positioning device is fixedly installed on the radial inner side of the wheel rim curing chamber. The first end of the spoke pin is positioned and fitted with the spoke pin positioning device, and the second end of the spoke pin passes through the wheel rim curing chamber. The second end of the spoke pin is used to form spoke holes on the wheel rim. The spoke pin positioning device includes a first positioning part, which is an inclined support surface structure. The first positioning part and the peripheral side of the spoke pin are in contact and fitted to position the angle between the spoke pin and the plane on which the wheel rim is located.

2. The thermosetting mold for wheel rims according to claim 1, characterized in that: The second end of the spoke hole pin is provided with a partially enlarged second head, the outer diameter of which is larger than the diameter of the spoke hole.

3. The thermosetting mold for wheel rims according to claim 2, characterized in that: The spoke pin positioning device also includes a second positioning part, which is a baffle structure. The second positioning part and the axial end face of the first end of the spoke pin are arranged opposite to each other to abut against the axial end face and position the spoke pin relative to the wheel rim in its axial direction.

4. The thermosetting mold for wheel rims according to claim 3, characterized in that: The first positioning part and the second positioning part are connected to form a "T"-shaped limiting groove. The first end of the spoke hole pin is provided with a first head with a partially enlarged diameter, and the first head is inserted into the limiting groove.

5. The thermosetting mold for wheel rims according to claim 1, characterized in that: The spoke hole pin positioning device is a detachable modular structure.

6. The thermosetting mold for wheel rims according to claim 5, characterized in that: The mold unit includes an upper mold and a lower mold, and the spoke hole pin positioning device is detachably fixedly connected to the lower mold.

7. The thermosetting mold for wheel rims according to claim 1, characterized in that: It also includes an airbag located in the wheel rim curing chamber, which is used to expand and open the inner wall of the wheel rim after inflation. The second end of the spoke hole pin faces the airbag, so that the airbag can push the spoke hole pin radially inward towards the wheel rim after inflation.

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