JPH09248859A - Production of hollow fiber reinforced resin molded object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bring the inner and outer surfaces of a hollow fiber reinforced resin molded object to good smooth surfaces. SOLUTION: A taper shaft core 7 having a gradient almost same to that of the inner surface 6 of the taper hole provided to a mold 5 and the molding material B composed of a fiber reinforced resin material 11 wound around the taper shaft core 7 are inserted into the taper hole. The molding material B is appropriately moved in an axially narrowing direction to press the fiber reinforced resin material 11. In this state, the molding material is cured to mold a hollow fiber reinforced resin molded object 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hollow fiber-reinforced resin molded product, which can make the inner surface and the outer surface of the hollow fiber-reinforced resin molded product a good smooth surface.

[0002]

2. Description of the Related Art As a conventional technique, a filament winding method (FW method) in which a sheet-shaped or tape-shaped molding material is wound around a shaft core and molded, and a molding material is arranged around a highly flexible cylinder. Then, there is an internal pressure molding method in which a molding material is pressed against a mold circular surface and molded by applying a circular pressure to the cylindrical body to expand it.

[0003]

In the FW method, the inner surface of the molded product is smooth and the inner diameter accuracy is good, but the outer surface has large irregularities and the accuracy is poor. Further, in the internal pressure molding method, the outer surface is smooth and the outer diameter accuracy is good, but the inner surface is uneven and the accuracy is poor. Furthermore, the thickness uniformity cannot be obtained.

[0004]

Therefore, as a result of intensive research, the inventors of the present invention have made extensive efforts to solve the above-mentioned problems, and as a result, have found that the present invention provides a taper having substantially the same slope as the inner surface of a tapered hole provided in a mold. A molding material composed of a shaft core and a fiber-reinforced resin material wound around the tapered shaft core is inserted into the inner surface of the tapered hole, and the molding material is appropriately moved in a direction in which the fiber is reinforced. By pressing and curing in this state to form a hollow fiber-reinforced resin molded body to form a hollow fiber-reinforced resin molded body,
Both the inner surface and the outer surface can be formed smoothly, and the above problems are solved.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A manufacturing method according to a first embodiment of the present invention will be described below with reference to FIGS. First, the components thereof will be described. FIG. 1 shows the entire apparatus. A is a press device, the press body 1 has a substantially U-shape, and a fixing plate 2 in which a heating body such as a heater and a cooling pipe are embedded is provided on one side of the vertical part. A movable plate 3 is movably provided by a drive cylinder 4 on the other vertical portion side. Therefore, the movable plate 3 is configured to move in parallel with the fixed plate 2 and to be pressed with an appropriate pressure.

Reference numeral 5 is a mold made of aluminum alloy or the like,
It is divided into left and right molds, and inside thereof, a tapered hole inner surface 6 is formed so as to narrow toward the lower side.
The surface of the inner surface 6 of the tapered hole is formed in a smooth shape with high precision. The six inner surfaces of the vertical tapered hole are divided into left and right sides at the center position of the circular cross section. A taper shaft core 7 (also referred to as a “mandrel”) having a slope substantially the same as the slope of the taper hole on the inner surface 6 of the taper hole is provided, and the surface of the taper shaft core 7 is also formed into a smooth surface with high accuracy. There is. Above and below the tapered shaft core 7, an upper sliding pipe 8a and a lower sliding pipe 8b are provided on the same shaft core, and the upper sliding pipe 8a and the lower sliding pipe 8b are the same as those of the mold 5. It is configured to be slidable in the vertical direction by being inserted into the holes of the upper guide 9a and the lower guide 9b provided above and below. At the lower end of the lower sliding tube 8b at the lower end of the tapered shaft core 7,
A pulling means 10 for pulling downward is provided. The pulling means 10 may be a hydraulic drive cylinder, a screw drive machine, or the like, but may be pulled by a weight in some cases.

Next, the manufacturing method of the first embodiment will be described. First, the taper shaft core 7 wound with a fiber reinforced resin material 11 made of a synthetic resin impregnated with carbon fiber or the like is wound. Deploy as molding material B. Then, the molding material B is inserted into the mold 5 that has been clamped. While pulling the lower slide tube 8b provided on the molding material B downward through the pulling means 10, the mold 5 is heated to a molding temperature of 200 or more. Then, the fiber-reinforced resin material 11 is pressed by the pressure drawn by the inner tapered shaft core 7 and the inner surface 6 of the tapered hole. As a result, the fiber-reinforced resin material 11
The inner surface and the outer surface of the are formed smooth. After a certain period of time through these steps, the mold 5 is cooled to the glass transition temperature of the resin, which is several tens of degrees, and the cured molding material B (molded product) is taken out from the mold 5. After that, the tapered shaft core 7 is taken out from the molding material B, and the cured hollow fiber-reinforced resin molded body 12 is manufactured.

Next, the manufacturing method of the second embodiment will be described. According to this manufacturing method, a product without a gradient is obtained in which the outer diameter side of the hollow fiber-reinforced resin material 11 is in the axial direction. As a component used in this manufacturing method, in particular, as shown in FIG. 5 (B), the mold 20 is provided with a straight hole inner surface 21 having a cavity having a gradient of 0 in the axial direction.
Further, a wall thickness adjusting material 22 is provided to make the axial direction on the outer diameter side of the fiber reinforced resin material 11 zero. The other constituent members are the same as those in the first embodiment, and therefore their explanations are omitted.

In the manufacturing method of the second embodiment, the taper shaft core 7 is wound with the fiber reinforced resin material 11 and the outer diameter side of the fiber reinforced resin material 11 has a gradient of 0 in the axial direction. A material 22 for adjusting the thickness is provided. Specifically, the material 22 for adjusting the wall thickness is laminated while being displaced by a constant distance in the direction in which the shaft core diameter decreases. This interval is the fiber reinforced resin material 1
It is adjusted by the change in the wall thickness of No. 1 in the axial direction and the wall thickness of the wall thickness adjusting material 22 after molding. Fiber reinforced resin material 1
After 1 and the material 22 for adjusting the wall thickness are laminated on the tapered shaft core 7, molding is performed in the same manner as in the manufacturing method of the first embodiment.

[0010]

EXAMPLE This is an example of the manufacturing method of the first embodiment, in which the fiber-reinforced resin material 11 is a continuous carbon fiber as a reinforcing fiber and a nylon resin continuous fiber as a matrix resin, and the continuous carbon fiber is 60% by weight. Two layers of the fiber-reinforced resin material 11, which is a mixed Ny6 / cf rounded blade obtained by mixing and composition, is laminated on the tapered shaft core 7 of the cavity (gradient 1/500) to obtain a molding material B, which is Inserted into the inner surface 6 of the tapered hole, the mold 5 is molded at a molding temperature of 250 to 25
Heat to 5 ° C. After reaching the molding temperature, the pulling force of the pulling means 10 is set to 100 kg / cm ² (relative to the cross-sectional area of the molded product), and after a certain time (for example, how long) has passed,
Mold 5 with nylon glass transition temperature of about 50 ° C
Then, the cured fiber-reinforced resin material 11 is taken out of the mold, and then the tapered shaft core 7 is taken out of the molding material B to manufacture a cured hollow fiber-reinforced resin molded body 12.

Next, in an example of the manufacturing method according to the second embodiment, two layers of Ny6 / cf round punching blade as the fiber reinforced resin material 11 are laminated on the tapered shaft core 7 of the cavity (gradient 1/500). Then, as the material 22 for adjusting the wall thickness,
Ny6 / cf round striking blades having a yarn diameter of 1/4 of the base material are laminated while being displaced by a constant distance in the direction in which the axial core diameter decreases. In this way, the fiber-reinforced resin material 11 and the wall-thickness adjusting material 22 are laminated on the taper shaft core 7, and the outer diameter side axial direction is formed into a gradient of 0 to produce a forming material. The manufacturing method is performed in the same manner as in the first embodiment, whereby a cured hollow fiber-reinforced resin molded body 13 having an outer diameter gradient of 0 is manufactured.

The hollow fiber reinforced resin moldings 12 obtained in the first and second embodiments have smooth inner and outer surfaces and high precision in both inner and outer diameters. In the molded article of Example 1,
The thickness uniformity was excellent, and the variation in thickness was within 1%.

[0013]

According to the first aspect of the present invention, the tapered shaft core 7 having substantially the same gradient as the inner surface 6 of the tapered hole provided in the die 5 is provided.
And the fiber-reinforced resin material 1 wound around the tapered shaft core 7.
1 is inserted into the inner surface 6 of the tapered hole, the molding material B is appropriately moved in the axial constriction direction to press the fiber reinforced resin material 11, and the fiber reinforced resin material 11 is cured in this state. Since the hollow fiber-reinforced resin molded body 12 is formed by molding the hollow fiber-reinforced resin molded body 12, the hollow fiber-reinforced resin molded body 12 has smooth inner and outer surfaces and high accuracy in inner and outer diameters. In addition, the uniform thickness can be produced.

To explain this effect in detail, the fiber-reinforced resin material 11 is sandwiched between the tapered shaft core 7 on the inner surface side and the inner surface 6 of the tapered hole on the outer surface side, and the tapered shaft core 7 is narrowed in the narrowing direction. When moved, the taper axis 7
The outer periphery of the fiber-reinforced resin material 11 acts to press the fiber-reinforced resin material 11 against the inner surface 6 of the tapered hole, and the fiber-reinforced resin material 11 is subjected to a compression effect. Therefore, the inner surface and the outer surface of the fiber reinforced resin material 11 can follow the outer surface of the tapered shaft core 7 and the inner surface of the tapered hole inner surface 6 to obtain smooth surfaces equivalent to the respective surfaces. There is a great advantage that the hollow fiber-reinforced resin molded body 12 cured thereafter can have smooth inner and outer surfaces and a uniform wall thickness.

Next, in the invention of claim 2, in claim 1, the moving direction is the same as the direction of gravity, and the tapered shaft core 7 is pulled by the pulling means 10 to form a hollow fiber-reinforced resin molded body. By adopting the manufacturing method of 1, the taper shaft core 7 can be pulled in the direction of gravity, and a pulling force for easily moving the taper shaft core 7 can be applied, so that the manufacturing method can be provided at low cost. Further, the outer diameter of the hollow fiber-reinforced resin molded body 12 is small, or in the case of a long molded product, the axis thereof is very likely to bend in a direction other than the gravity direction. Therefore, the greatest advantage is that the prevention of bending can be ensured.

Further, in the invention of claim 3, the fiber reinforced resin material 11 is wound around the tapered shaft core 7, and the wall thickness adjusting material 22 is used so that the outer periphery of the fiber reinforced resin material 11 becomes a straight cylindrical surface. A molding material B ₂ composed of the fiber-reinforced resin material 11, the material 22 for adjusting the wall thickness, and the tapered shaft core 7 formed by
Is inserted into the inner surface 21 of the linear hole provided in the mold 20, and the molding material B ₂ is appropriately moved in the axially constricting direction of the tapered shaft core 7 to adjust the fiber reinforced resin material 11 and the wall thickness. The material 22 is pressed, and cured in this state to form the hollow fiber-reinforced resin molded body 13. The hollow fiber-reinforced resin molded body is manufactured by the taper shaft core 7. Resin material 11 and material 2 for adjusting wall thickness
As a result, the hollow material composed of the fiber reinforced resin material 11 and the wall thickness adjusting material 22 can be formed into a smooth inner surface and outer surface. In particular, in this case,
It is possible to provide a product whose outer surface is a straight cylindrical surface without taper.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of an apparatus used in a manufacturing method according to a second embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view showing a state in which a fiber reinforced resin material is wound around a taper shaft core.

FIG. 3 is a partially enlarged cross-sectional view of the state shown in FIG. 2 inserted in a mold.

FIG. 4 (A) is a partially enlarged cross-sectional view showing a state in which a taper shaft core with a fiber reinforced resin material inserted in a mold is moved downward to press the molding material, and (B) is a fiber reinforced after molding. Take out the taper shaft core with resin material, remove the molding material from the taper shaft core, and partially enlarge a cross-sectional view of the inner and outer surfaces formed to be smooth.

FIG. 5 (A) is a partially enlarged cross-sectional view showing a state in which a fiber reinforced resin material and a material for adjusting the wall thickness are wound around a taper shaft core used in the manufacturing method of the second embodiment of the present invention. Part A is an enlarged cross-sectional view of the state in which A) is inserted into the mold, the taper shaft core is moved downward, the molding material is pressed, and the inner and outer surfaces are molded to be smooth.

[Explanation of symbols]

5,20 ... die 6 ... taper hole inner surface 7 ... taper axis 10 ... pulling means 11 ... fiber reinforced resin material 12, 13 ... hollow fiber-reinforced resin molded body 22 ... thickness adjusting material B, B ₂ ... molding Material

Claims (3)

[Claims] 1. A molding material comprising a taper shaft core having substantially the same gradient as that of a taper hole inner surface provided in a mold and a fiber reinforced resin material wound around the taper shaft core is inserted into the taper hole inner surface, A hollow fiber reinforced resin characterized by molding the hollow fiber reinforced resin molded body by appropriately moving the molding material in the axially narrowing direction to press the fiber reinforced resin material and curing in this state. Method for manufacturing molded body. 2. The method for manufacturing a hollow fiber-reinforced resin molded body according to claim 1, wherein the moving direction is the same as the direction of gravity and the tapered shaft core is pulled by a pulling means. 3. A fiber reinforced resin material formed by wrapping a fiber reinforced resin material around a tapered shaft core and using a material for adjusting wall thickness such that the outer circumference of the fiber reinforced resin material is a straight cylindrical surface and the wall thickness adjustment. The fiber-reinforced resin material is formed by inserting a molding material composed of a molding material and a taper shaft core into the inner surface of a straight hole provided in a mold, and appropriately moving the molding material in a direction in which the taper shaft core is narrowed in the axial direction. A method for producing a hollow fiber-reinforced resin molded product, characterized in that the hollow fiber-reinforced resin molded product is molded by pressing and a material for adjusting the wall thickness and curing in this state.