JPH0669734B2 - Method for manufacturing carbon fiber reinforced plastic disc wheel for bicycle - Google Patents

Description

The present invention relates to a method for manufacturing a carbon fiber reinforced plastic disc wheel for a bicycle.

(Prior Art) As shown in FIG. 3, a conventional bicycle disc wheel is made by combining aluminum alloy square pipes, urethane foam, wood, etc. and adhering them together to form a disc-shaped aluminum honeycomb structure disc wheel body ( 8) is made, and the rim part (7) is fixed to the outer peripheral part thereof, and outer plates (glass fiber plate, carbon fiber reinforced plastic plate, or both sides) of the rim part (7) and the disc wheel body (8) are formed. A bicycle disc wheel is manufactured by bonding an aluminum alloy plate (13), inserting the hub (12) into the center hole of the disc wheel body (8), and joining it to the disc wheel body (8). There is.

(Problems to be Solved by the Invention) In the conventional method for manufacturing a bicycle disc wheel, since the disc wheel body (8) is molded as a disc-shaped aluminum honeycomb structure, the bonding work at that time is complicated. The centering work of the rim portion (7) after molding requires many steps, resulting in low productivity and high cost.

The present invention is proposed in view of the above problems, and an object of the present invention is to provide a method for manufacturing a carbon fiber reinforced plastic disk wheel for a bicycle, which has high productivity and can reduce manufacturing cost. In point.

(Means for Solving the Problems) In order to achieve the above object, a method for manufacturing a carbon fiber reinforced plastic disc wheel for a bicycle according to the present invention comprises:
The outer mold of the rim portion was set on the outer periphery of the lower mold, and then a plurality of prepregs obtained by impregnating carbon fiber with a thermosetting resin were placed on the lower mold in the laminated state and Apply the outer periphery of the prepreg to the inner peripheral surface of the rim molding outer mold, then set the upper mold on the portion of the prepreg excluding the outer periphery, and then to the same mold and the rim molding outer mold. Insert the square silicone rubber rim part inner mold onto the prepreg between them, and bring the outermost peripheral part of the prepreg into contact with the upper surface of the silicone rubber rim part inner mold, and then the outermost part of the prepreg. The pressing die is set on the above, the prepreg is pressed through the pressing die and the upper die, and the rim portion outer mold, the holding die, and the silicone rubber rim portion inner die are pressed. The rim is molded by and the prepreg is After heating to the curing temperature of the curable resin to cure it and cooling it, the upper and lower molds, the rim part molding outer mold and the pressing mold are separated from each other and the silicone rubber rim part molding inner mold is rimmed. Take out from the inside of the unit, make a disk wheel body with rim on one side, overlap the disk wheel body with symmetrical rim with the rim disk disk body made in the same way, and then overlap with this double rim The hub is inserted into the center hole of the disk wheel body, and the contact portion between the disk wheel bodies with rims and the contact portion between the disk wheel body with rims and the hub are bonded with a structural adhesive.

(Operation) The present invention is configured as described above, and in manufacturing a carbon fiber reinforced plastic disc wheel for a bicycle, a rim forming outer die is set on the outer peripheral portion of the lower die, and then the carbon fiber is set. A plurality of prepregs obtained by impregnating the prepreg with the thermosetting resin are placed on the lower mold in a laminated state, and the outer peripheral portion of the prepreg is applied to the inner peripheral surface of the outer mold for molding the rim portion, and then, The upper mold is set on the part of the same prepreg excluding the outer peripheral part, and then a square silicone rubber rim part inner mold is inserted on the prepreg between the same mold and the rim part molding outer mold. Contact the outermost periphery of the prepreg with the upper surface of the silicone rubber rim molding inner die, and then set a pressing die on the outermost periphery of the prepreg, and press the holding die and the upper die. Pressurize the above prepreg through Then, the rim portion is molded by the rim portion molding outer die, the pressing die, and the silicone rubber rim portion molding inner die, and the prepreg is heated to the curing temperature of the thermosetting resin to be cured, After cooling, the upper and lower molds, the rim part molding outer mold and the pressing mold are separated from each other, and the silicone rubber rim part molding inner mold is taken out from the rim part to make a disc wheel body with a rim on one side, The disc wheel body with rim and the symmetrical disc wheel body with rim made in the same manner are superposed face to face, and then a hub is inserted into the center hole of the disc wheel body with double rims. The carbon fiber reinforced plastic bicycle disk is made by adhering the contact parts of the wheel bodies to each other and the disk body with rims to the hub with a structural adhesive. To complete the wheel.

(Example) Next, a method of manufacturing the carbon fiber reinforced plastic disc wheel for a bicycle of the present invention will be specifically described with reference to Figs. 1 and 2. (1) in Fig. 1 is a lower mold, and (2) is Upper mold,
(3) is a mold for molding the rim portion, (4) is a holding metal fitting, (5)
Is a silicone rubber rim molding inner mold, (6) is a prepreg, (9) in FIG. 2 is a rim, (10) is a disc wheel body, (11) is a contact portion between disc wheel bodies (11), When manufacturing a carbon fiber reinforced plastic bicycle disc wheel (12), a rim molding outer mold (3) is set on the outer periphery of the lower mold (1).
Next, a plurality of prepregs (6) obtained by impregnating carbon fibers with a thermosetting resin are placed on the lower mold (1) in a laminated state, and the outer peripheral portion of the prepregs (6) is outside the rim portion molding. Apply to the inner peripheral surface of the mold (3), then set the upper mold (2) on the part of the prepreg (6) excluding the outer peripheral part, and then mold the upper mold (2) and the outer mold for molding the rim ( 3) Insert a rectangular silicone rubber rim part forming inner mold (5) on the prepreg (6) between the prepreg (6) and the outermost peripheral part of the prepreg (6) and make a silicone rubber rim part forming inner mold (5). ) Is contacted with the upper surface of the prepreg (6), then the pressing die (4) is set on the outermost peripheral portion of the prepreg (6), and the prepreg (6) is inserted through the pressing die (4) and the upper die (2). The rim is pressed by the outer mold (3) for forming the rim portion, the pressing die (4) and the inner mold (5) for forming the rim portion made of silicon rubber. While molding the prepreg (6), the prepreg (6) is heated to the hardening temperature of the thermosetting resin to be hardened, and after cooling, the upper mold (2), the rim part molding outer mold (3) and the pressing mold ( 4) and the silicone rubber rim molding inner mold (5) is taken out from the rim and a disc wheel body (10) with a rim on one side is made, the same as the disc wheel body with a rim (10). The symmetrical disc wheel body with rims (10) made in the way is overlaid face to face, and then the hub (12) is placed in the center hole of this double rimmed disc wheel body (10) (10).
Insert the disc wheel body with rim (10) into contact with each other, the disc wheel body with rim (10) and the hub (12)
The carbon fiber reinforced plastic disc wheel for bicycles is completed by adhering the contact area with the structural adhesive.

(Effect of the Invention) As described above, the method for manufacturing a carbon fiber reinforced plastic disc wheel for a bicycle according to the present invention can form the disc wheel body and the rim portion as a double plate-shaped body and a cylindrical body as described above. The complicated bonding work and centering work of the rim portion after molding, which were required when molding the disk wheel body as a disk-shaped aluminum honeycomb structure like this, can be dispensed with and the productivity can be improved. Is effective.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a method of manufacturing a carbon fiber reinforced plastic bicycle disc wheel according to the present invention, and FIG. 2 is a vertical sectional side view of a carbon fiber reinforced plastic bicycle disc wheel after molding. , FIG. 3 is a vertical sectional side view of a conventional bicycle disc wheel. (1) …… Lower mold, (2) …… Upper mold, (3) …… Rim molding outer mold, (4) …… Pressing mold, (5) …… Silicone rubber rim molding inside Mold, (6) …… prepreg,
(9) …… Rim part, (10) …… Disk wheel body,
(11) …… Contact part, (12) …… Hub.

Claims (1)

[Claims] 1. A plurality of prepregs obtained by setting a rim portion molding outer die on the outer periphery of a lower die and then impregnating carbon fibers with a thermosetting resin are laminated on the lower die. In this state, the outer peripheral part of the prepreg is applied to the inner peripheral surface of the outer mold for the rim part, and then the upper mold is set on the part excluding the outer peripheral part of the prepreg. Insert the square silicone rubber rim part inner mold on the prepreg between the part mold outer mold, and bring the outermost peripheral part of the prepreg into contact with the upper surface of the same silicone rubber rim part mold inner mold.
Next, a pressing die is set on the outermost peripheral part of the prepreg, and the prepreg is pressed through the pressing die and the upper die to form the outer mold for forming the rim portion, the holding die and the silicone. While molding the rim portion with the rubber rim portion inner mold, the prepreg is heated to the curing temperature of the thermosetting resin to cure and then cooled, and then the upper and lower molds and the rim portion outer mold are formed. A rim with a symmetrical shape made in the same way as the disc wheel body with a rim by separating the press die from the mold and taking out the inner mold for molding the rim part made of silicon rubber from the rim part. The disc wheel body with rim is placed face-to-face, and then the hub is inserted into the center hole of the disc wheel body with rims. Method for producing a beam with disc wheel body and the carbon fiber-reinforced plastic made bicycle disc wheel is characterized in that the contact portion between the hub is bonded by construction adhesive.