JPH0761658B2 - Device and method for manufacturing fiber-reinforced resin wheel - Google Patents

Description

TECHNICAL FIELD The present invention relates to an automobile wheel manufacturing apparatus and manufacturing method for manufacturing a wheel by compression molding a fiber reinforced resin material.

2. Description of the Related Art Conventional techniques and their problems Conventionally, various methods have been proposed for manufacturing an automobile wheel by compression molding a fiber reinforced resin material. (For example, Japanese Examined Patent Publication No. 61-3242 and Japanese Patent Laid-Open No. 55-133949) However, an automobile wheel has a shape composed of a cylindrical rim portion and a plate-shaped disc portion orthogonal to the central axis thereof. The rim portion has a shape having an undercut in the central axis direction. For this reason, when compression-molding an automobile wheel having the above-described shape, as shown in FIG. 5, the disc part (15) is positioned on the horizontal plane of the lower mold (17) arranged on the base (8). Then, a manufacturing apparatus having a structure in which the rim portion (16) is positioned on the vertical cylindrical side surface of the rim mold (18) arranged around the rim part (16) and the upper mold (19) is arranged on the upper part is used.

When compression molding is performed by the above manufacturing apparatus, since the pressing force acts only in the vertical direction, effective pressure acts on the disk part (15) located between the horizontal surfaces of the mold, but it is located between the vertical surfaces of the mold. The effective pressure did not act on the rim portion (16), which caused the strength of the rim portion to decrease.

That is, when molding a product that requires relatively little strength, the fiber content of the fiber-reinforced resin material used is small,
Since the fluidity of the material is great, even with the above-mentioned molding device, the pressing force acting on the horizontal surface of the mold is accompanied by the flow of the material,
Since it also works effectively on the vertical surface of the mold, the strength is not reduced.

However, when molding products that require high strength such as automobile wheels, the fiber content of the fiber-reinforced resin material used is large and its fluidity is extremely small, so when setting the material in a mold, The material was set in an area of about 90% of the projected area of the molded product so that the material was sufficiently filled in the mold during the pressure molding. However, when an automobile wheel is molded using the above molding device, the pressing force acting on the horizontal surface of the mold is not effectively transmitted to the vertical surface of the mold when the material fluidity is low, and the rim portion of the molded product is always pressed. There was a problem that the pressure became insufficient and the product strength was reduced.

Means for Solving Problems The present invention has been made to solve the above problems, and is an apparatus for molding a fiber reinforced resin wheel by compression molding a fiber reinforced resin material, which comprises an upper die and a lower die. A mold is composed of a mold and a rim mold that can be opened and closed, and a heat-resistant elastic body is attached to the rim side mold surface of the upper mold or the upper mold and the lower mold,
Manufacturing apparatus and manufacturing of fiber-reinforced resin wheel in which a fluid is pressurized and injected between the mold surface and the heat-resistant elastic body so that an effective pressure is applied to the rim portion located on the mold vertical surface. The purpose is to provide the law.

Operation A predetermined material is set in a recess formed by the lower mold of the wheel manufacturing apparatus according to the present invention and the closed rim mold,
Close the upper mold and heat and pressurize. Then, by injecting a fluid under pressure between the upper mold or the upper and lower molds and the heat-resistant elastic body covering it, and holding it for a certain period of time, the required pressure is applied to the rim of the wheel. Is added to obtain a wheel made of fiber-reinforced resin with no reduction in strength.

Example An example of an apparatus for manufacturing a fiber-reinforced resin wheel of the present invention will be described with reference to the drawings.

As shown in FIG. 1, (1) is a lower mold which is detachably provided on a base (8) arranged in a hydraulic press by bolts or other fixing means.

An upper die (2) is arranged above the lower die (1) so as to be movable up and down. (3) is a rim type and a lower type (1)
And the upper mold (2) is arranged so as to surround the periphery of the upper mold (2) and is divided into 2 to 4 so as to move in the radial direction. (4) is a slide base provided under the rim type (3),
It is detachably fixed to the base (8). (5) is a slide mechanism for opening and closing the rim type (3) while sliding it on the slide base (4).

The upper mold (2) has a rim mold surface (6) forming a rim portion of a wheel covered with a heat resistant elastic body (7), and both ends of the heat resistant elastic body (7) are fixed. In addition, the rim mold surface (6) of the upper mold (2) is provided with a plurality of holes (9) for fluid injection communicating with the surface of the rim mold surface (6) at equal intervals. A fluid is injected between the surface of (6) and the heat-resistant elastic body (7).

Three to eight holes (9) for injecting fluid are provided in the circumferential direction on the circumferential surface of the upper mold (2), and the vertical direction has two stages in the figure. The holes (9) are communicated with each other by communication holes (10). Further, the communication hole (10) is connected to the hydraulic pump (12) through the connection pipe (11), and the fluid is supplied to the hole (9) at a constant pressure to constitute an automobile wheel manufacturing apparatus. There is.

In the above-mentioned examples, as the heat-resistant elastic body (7), silicone rubber, fluorine rubber or synthetic rubber having excellent heat resistance can be used. Further, as the fluid, a non-flammable hydraulic oil (for example, light emitting Daphne Fire Bruch P)
Alternatively, a heat resistant oil can be used.

Further, in the above-mentioned embodiment, the heat resistant elastic body (7) is not used for the lower mold (1), but as shown in FIG. 4, on the mold surface corresponding to the rim flange portion of the lower mold (1), A heat-resistant elastic body (7) is fixedly attached to the lower mold at both ends so as to cover the mold surface, and a fluid is injected between the mold surface and the heat-resistant elastic body so that the mold is formed. It is also possible to provide a fluid injection hole (9) communicating with the surface and connect it to a hydraulic pump via a connection pipe (11). It can also be connected to a pump.

Next, a manufacturing method for manufacturing a fiber-reinforced resin wheel using the above-mentioned automobile wheel manufacturing apparatus will be described.

In FIG. 2, a fiber reinforced resin material (13) cut into a predetermined shape is set in a recess formed by the lower mold (1) and the rim mold (3) already closed.

In this example, as the fiber reinforced resin material (13), a glass fiber reinforced unsaturated polyester sheet molding compound (Polymer Matt HSMC manufactured by Takeda) was used.

Then, as shown in FIG. 3, the upper mold (2) is closed and pressurized. At this time, the upper mold (2), the lower mold (1) and the rim mold (3) are preheated to 130 ° C to 150 ° C. As the heating method, an electric heater is used in this embodiment, but other heating methods such as a steam circulation type and a heating oil circulation type may be used. In addition, pressurization uses a hydraulic press,
The press pressure is set and maintained so that the molding pressure is 100 to 150 Kg / cm ² .

Immediately after closing the upper die (2), as shown in FIG. 3 (b), the fluid is transferred to the upper die (2) and the heat resistant elastic body by the hydraulic pump (12) arranged as the fluid pressure injection means. Pressure injection is carried out between (7). In this example, non-flammable hydraulic oil was heated to 130 to 150 ° C. as a fluid and pressurized. The injection pressure is 50 to 60 Kg / cm ² , and the molding product is maintained for a predetermined time to cure. When the lower mold (1) is provided with the heat resistant elastic body (7), a fluid is added between the lower mold (1) and the heat resistant elastic body (7) as in the upper mold (2). It is to inject pressure.

As described above, the fluid is applied to the upper mold (2) and the heat resistant elastic body (7).
A heat-resistant elastic body (7) by injection under pressure between and
Can expand in the radial direction and can be applied with appropriate pressure to the rim portion of the wheel located on the vertical cylindrical surface, which is difficult to press only in the vertical direction by pressing or the like.

The molding of the fiber-reinforced resin wheel is completed as described above, and thereafter, the fluid is poured out from the hole (9), the mold is opened, and the wheel (14) is taken out.

Advantageous Effects of Invention The present invention covers the surface of a mold of a fiber-reinforced resin wheel with a heat-resistant elastic body, and pressurizes and injects a fluid between the heat-resistant elastic body and the mold body so as to apply only in the vertical direction. Since the rim portion of the wheel, which is hard to apply pressure, can be pressed from the inner surface side of the mold, the invention has an excellent effect that the disk portion and the rim portion of the wheel are uniformly pressed, and the wheel can be manufactured without deterioration in strength. Is.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an apparatus for producing a fiber-reinforced resin wheel of the present invention, FIGS. 2 to 3 show a method of producing a wheel of the present invention, and FIG. FIG. 3 (a) is an explanatory view showing a pressed state,
FIG. 3B is an explanatory view of a main part showing a state of injecting a fluid,
FIG. 5 is a sectional view showing another embodiment of the lower mold of the present invention, and FIG. 5 is a sectional view showing a conventional wheel manufacturing apparatus. (1), (17) …… Lower mold, (2), (19) …… Upper mold (3), (18) …… Rim type, (4) …… Slide base (5) …… Slide mechanism, (6) …… Rim type surface (7) …… Heat resistant elastic body, (8) …… Base (9) …… Fluid injection hole, (10) …… Communication hole (11) …… Connection pipe, (12) …… hydraulic pump (13) …… fiber reinforced resin material (14) …… wheel, (15) …… disc part (16) …… rim part

Claims (3)

[Claims] 1. A manufacturing apparatus for manufacturing a fiber-reinforced resin wheel by compression-molding a fiber-reinforced resin material, wherein a molding die is composed of an upper die, a lower die and a rim die that can be opened and closed. A plurality of holes for injecting fluid and a heat-resistant elastic body attached so as to cover the mold surface are provided on at least the rim-side mold surface of the upper mold and the mold surface. An apparatus for manufacturing a fiber-reinforced resin wheel, characterized in that a fluid pressurizing and injecting means for pressurizing and injecting a fluid between the heat resistant elastic body and the heat-resistant elastic body are connected to each other through a connecting pipe. 2. A method for manufacturing a fiber-reinforced resin wheel obtained by compression molding a fiber-reinforced resin material, comprising setting a fiber-reinforced resin material in a recess formed by a lower mold and a closed rim mold, After the molding die is heated, the upper die is closed and pressurized, and at the same time, the fluid is pressurized and injected between the die surface and the heat-resistant elastic body by the fluid pressure injecting means. Resin wheel manufacturing method. 3. The method for manufacturing a fiber-reinforced resin wheel according to claim 2, wherein the fluid is heated in advance before the fluid is injected under pressure.