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Method for forming frame of bicycle

A molding method and bicycle technology, which can be applied to household components, household appliances, other household appliances, etc., can solve the problems of increased material cost, damage, poor fiber orientation, etc., and achieve the effect of saving materials

Inactive Publication Date: 2007-06-27
XIAMEN KEENTECH COMPOSITE TECH CO LTD
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Problems solved by technology

[0004] However, the above-mentioned production process has the following defects: when the pipes are preformed, because the resin has not yet solidified, the pipes are too soft, so the appearance of the reinforcing yarn sheet cannot reach the appearance after curing, and wrinkles appear in the fibers during molding. There will be a phenomenon of poor fiber direction, which will affect the strength of the joints of the pipe fittings, resulting in stress concentration at each joint. This phenomenon is not easy to be found in the inspection. harm to the user
In order to ensure the strength of the joint, only more yarn sheets are added during preforming to increase its joint strength, which virtually increases the cost of materials

Method used

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Embodiment Construction

[0017] As shown in Figure 2, the molding method of bicycle frame of the present invention is:

[0018] 1. First, install the nylon air duct on the mandrel;

[0019] 2. After impregnating the yarn with resin, roll it outside the nylon air pipe to form the rough shape of each pipe fitting of the frame;

[0020] 3. Then put the pipe fittings into the freezer to freeze, the temperature in the freezer is controlled at 0 to minus 20 degrees Celsius, freeze for 1 to 5 hours, and shape the pipe fittings;

[0021] 4. Then take the pipe fittings out of the freezer and pull out the mandrel;

[0022] 5. Preform the frame pipe fittings in a low-temperature room with an ambient temperature below 20 degrees Celsius, that is, cut out the joint gaps at the joints of each pipe fittings and then splice them. After splicing, the joints will be covered with reinforcing yarn. In this preforming process, it takes a certain amount of time for the temperature to rise. Therefore, when the reinforcing...

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Abstract

The present invention discloses a forming method of bicycle frame. Said method includes the following steps: (1). mounting nylon air pipe on the spindle; (2). making the yarn sheet impregnated with resin be winded round the exterior of the nylon air pipe; (3). freezing in ice room; (4). taking out the pipe piece from ice room and drawing out the spindle; (5). performing, placing yarn sheet in the junction of pipe piece; (6). placing the above-mentioned pipe piece into mould interior, heating, solidifying and forming; and (7). finishing appearance.

Description

technical field [0001] The invention relates to a forming method of a bicycle frame made of composite materials. Background technique [0002] In traditional bicycles, the entire vehicle frame is made of metal pipe fittings, but the bicycle with this welded metal structure has a heavy body and poor fatigue resistance. Therefore, in order to reduce the weight of the body and increase its fatigue resistance, the entire frame is made of light-weight, high-strength composite carbon fiber material. [0003] The existing vehicle frame made of composite fiber adopts integral molding technology, as shown in Figure 1, its specific manufacturing process is: 1) rolling the yarn sheet made of composite fiber impregnated with resin on the mandrel to form a pipe; 2 ) Then take out the mandrel, and then put it into the nylon air duct; 3) preform: place reinforcing yarn pieces at the joints of the pipes; 4) place them in the mold for heating and curing; 5) exterior renovation. The integra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C53/56B29C53/84B29C53/80B29C35/02B29C73/00B29L31/30
Inventor 沈文振
Owner XIAMEN KEENTECH COMPOSITE TECH CO LTD
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