JPS595030A - Manufacture of fiber reinforced composite material made parts - Google Patents

Abstract

PURPOSE:To prevent thinning of the thickness of a fiber reinforced composite material at its corner part, by decreasing a frictional resistance between the fiber reinforced composite material before a cure and a mold by clamping the mold after covering a thermoplastic resin on the surface of a stock material. CONSTITUTION:The stock material 15 covered with a fiber reinforced composite material 16 is shaped by braiding a reinforcing fiber 5 on the outside of an elastomer made hollow object 1 by a winder 3, passing it through a resin path 11 and sticking a thermosetting resin 9. Then, a thermoplastic resin 17 is covered on the outer periphery of the stock material 15 film like by a tape winder 21. The stock 15 is placed in a mold 25, an internal pressure being added, preheated to a predetermined temperature, then the mold 25 is clamped. Accordingly, the thermoplastic resin 17 is softened or melted during a mold clamping, the thermosetting resin 9 in a straight part 31 moves easily and supplements and it is prevented that the thickness of the reinforcing material 16 becomes thin at a corner part 29.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing fiber-reinforced composite parts, such as a stabilizer for an automobile, using fiber-reinforced composite materials.

As a conventional method for manufacturing parts made of m-fiber reinforced composite materials, there are methods shown in FIGS. 1 and 2, for example. 1 and 2 show a method of manufacturing the stabilizer, in which the material 115 is a reinforced wire 1105 made of IIN or the like on the outer periphery of the elastic pipe 101; It is formed by covering a fiber-reinforced composite material 116 made of resin 109. This material 115 is placed in the groove 127a of the lower mold 127 of the mold 125. At this time, the element 0115 is stored in a bent state by the corner part 129 of the groove 1278. Next, the upper mold 128 is placed over the material 115 to clamp the material 115, and the material 115 is preheated at a predetermined temperature to thermally cure the fiber reinforced composite material 116, thereby lowering its viscosity.

By curing the thermosetting resin to some extent, its viscosity is lowered.

When the viscosity of the curable resin has decreased, fluid is pressurized into the elastic pipe 101 and internal pressure is applied as shown by the arrow in FIG.
a, J along 128a: Sea urchin molding. Once the shape of the material 115 is set, heating is performed to harden the thermosetting resin 109, thereby obtaining a molded stabilizer.

By the way, according to this manufacturing method, since the pipe 101 made of elastic material is carved by applying internal pressure, it has the advantage that it is easy to obtain a well-shaped product. however,
When internal pressure is applied to the elastic pipe 101, the material 115
Due to the expansion of the fiber-reinforced composite material 116 on the outside of the cope part 129, the fiber-reinforced composite material 116 on the outside of the cope part 129 extends by 8α from the hair as shown in FIG. As shown in FIG. 4, the upper and lower grooves 127a
, 128a. In this case, if the fiber-reinforced composite material 116 is replenished into the corner part 129 by moving as shown by the arrow in FIG.
The fiber-reinforced composite material 116 at No. 9 has no problem in the upper and lower grooves 127a.
, 128a. However, material 115
When the #AH reinforced composite material 116 is clamped by the mold 125, the thermosetting resin 109 of the #AH reinforced composite material 116 does not have a fixed shape before curing, so it is likely to cause mold jamming C as shown in Fig. 5. There is. When this type of bite C occurs in the fiber reinforced composite material 116 at the straight portion 131, the fiber reinforced composite material 116 cannot move as shown by the arrow in FIG. is the upper and lower groove 127a
, 128a. For this reason, the corner part 12 of the stabilizer assembly obtained by hardening
9 became flat (D+<D2) as shown in FIG. 6, resulting in a decrease in strength. Furthermore, the mold bite C disturbs the fiber structure of the fiber reinforced composite material 116, which also causes a decrease in strength. Furthermore, even if mold engagement C does not occur, when applying internal pressure to the elastic pipe 101, the thermosetting resin 109 of the fiber-reinforced composite material 116 has not yet hardened, so the frictional resistance between it and the mold 125 increases. This is large, making it difficult for the fiber-reinforced composite material 116 to move as indicated by the arrow in FIG.

Therefore, some of the corners of the stabilizer obtained by curing become flat as shown in FIG. 6, resulting in a decrease in strength.

This invention was devised in view of the above-mentioned problems, and provides a method for manufacturing parts made of fiber-reinforced composite material 3, which makes it possible to obtain a molded product with a well-shaped part even at the corners and prevent a decrease in strength. This is what we provide.

In order to achieve this object, the present invention provides a first method of forming a material by coating the outer periphery of a hollow body made of an elastic body with a fiber-reinforced composite material.
and a second step of clamping the material with a mold having a corner part, applying internal pressure to the hollow body made of an elastic body, and then heating and curing the material, the method comprising: Between the first step and the second step, a step of coating the surface of the material with a thermoplastic resin in the form of a film is added.

Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 7 and 8.

FIGS. 7 and 8 show a method for manufacturing fiber-reinforced composite parts, such as stabilizers. As shown in FIG. 3, reinforcing fiber [5] such as carbon fiber is knitted.

The elastic hollow body 1 knitted with reinforcing fibers H5 is the 10th-
7, and further passed through a resin tank 11 filled with a thermosetting resin 9 made of epoxy resin or the like before curing. By passing through the resin tank 11, the thermosetting resin 9 infiltrates and adheres to the reinforcing fibers H5 knitted around the outer periphery of the elastic hollow body 1. Next, the elastic hollow body 1 is passed through the 20th lathe 13 outside the resin tank 11, with the thermosetting resin 9 still attached to the knitted reinforcing fibers H5. This 20th-
By passing the material through the rubber 13, excess resin 9 is squeezed out, and a tubular material 15 is formed. In this way, the first step of forming the cable material 15 by covering the outer periphery of the elastic hollow body 1 with the mtix reinforced composite material 16 made of the reinforcing fibers 5 and the thermosetting resin 9 is completed.

The material 15 is further fed, and the outer periphery of the material 15 is coated with a thermoplastic resin 17 along the way. Thermoplastic resin 17
is a tape-like material made of polyethylene or the like, which is sequentially fed out from a tape feeder 19 and coated on the surface of the material 15 in a film form by a tape winder 21. Thermoplastic resin 17
The material 15 coated with is passed through the 30th-ra 23.

The 30th wire 23 has a temperature high enough to harden the thermoplastic resin 17, and when the material 15 passes through the 30th wire 23, the thermoplastic resin 17 hardens and becomes circular in cross section. The T culm is shaped and the material 15 is coated with the thermoplastic resin 17.

The material 15 coated with the thermoplastic resin 17 is clamped using a mold 25 as shown in FIG. This mold 25 is a mold consisting of a lower mold 27 and an upper mold (not shown), and the corner part 29 where the cable material 15 is stored in a bent state between the groove 278 of the lower mold 27 and the groove of the upper mold is straight. It has a straight part 31 that can be accommodated in a straight line. Then, the material 15 is placed along the groove 27a of the lower mold 27, the upper mold is aligned with the lower mold 27, and the mold is clamped between the groove 127a of the lower mold 27 and the groove of the upper mold. At this time, since the surface of the material 15 has been shaped with the thermoplastic resin 17, it can be easily placed between the groove 27a of the lower mold 27 and the groove of the upper mold, and
There is no possibility that the mold of the material 15 will be caught between the mold and the upper mold. One end of the elastic hollow body 1 of the clamped material 15 is closed, and fluid pressure such as air pressure or hydraulic pressure is applied as internal pressure from the other end, while the material 15 is preheated to a predetermined temperature. When internal pressure is applied to the elastic hollow body 1, the material 15 expands and assumes a shape along the grooves 27a of the lower mold 27 and the grooves of the upper mold. At this time, the fiber-reinforced composite material 16 of the material 15 on the outside of the corner part 29 stretches and tries to become thinner. As the thermosetting resin 9 softens or melts, the thermosetting resin 9 in the straight portion 31 easily moves to the corner portion 29 as shown by the arrow in FIG. 8 and is replenished, so that it does not become thin. Therefore, the material 15 has a corner part of 29 degrees and a straight part 3.
1, the shape follows the grooves 27a of the lower die 27 and the grooves of the upper die. Then, by heating I! The thermosetting resin 9 of the navy blue reinforced composite material 7 is cured, the second step is completed, and a molded stabilizer is obtained. Since the thermoplastic resin 17 is brought into a molten state or a state close to it by heating during curing of the thermosetting resin 9, gas in the thermosetting resin 9 can be easily released. Therefore, it is possible to prevent the strength of the II fiber-reinforced composite material 16 from decreasing due to gas remaining in the thermosetting resin 9.

Note that this invention is not limited to the above-mentioned embodiment. For example, in the above embodiment, a tape-shaped thermoplastic resin 17 was used to cover the rope material 15.
It is also possible to harden the liquid when it passes through the 30th-ra 23. It is also effective to attach highly sliding silicon particles to the front or back surface of the thermoplastic resin 17 or to mix them into the thermoplastic resin 17 in advance. In the above embodiment, the material 15 has no pattern bite and the material 15
As described above, preheating softens or melts the thermoplastic resin 17 on the surface, making it easier for the thermosetting resin 9 to move during expansion. A sufficient effect can be expected only by reducing the frictional resistance between the mold 9 and the mold 25. It is efficient to prepare a plurality of molds 25 and clamp the material 15 at once. The internal pressure applied to the elastic hollow body 1 is not limited to fluid pressure, but can also be obtained by injecting a thermal expansion material or the like. This invention is of course applicable not only to the molding of stabilizers but also to other products.

According to the configuration of the present invention as described above, the previous 9-IA is applied to the surface of the material.
7 8- Since the plastic resin is coated and then the mold is clamped, it is possible to reduce the frictional resistance between the 1llft reinforced composite material before curing and the mold. Therefore, when internal pressure is applied to the hollow body made of elastic material, the IjAM reinforced composite material moves from both sides of the corner to the corner part and is easily replenished, and the fiber reinforced composite material becomes thin even in the corner part. This makes it possible to mold the product into a shape that follows the mold. Therefore, it is possible to obtain a well-shaped molded product even at a portion of the corner, and a decrease in strength can be prevented. Furthermore, since the surface of the material before hardening is coated with a thermoplastic resin, the outer shape of the material can be easily adjusted before being placed in a mold, and it is also possible to prevent so-called mold clogging.

Therefore, it is possible to prevent replenishment of the m-fiber-reinforced composite material to a part of the corner due to mold jamming, and in this case, it is also possible to obtain a well-shaped molded product and prevent a decrease in strength. can. Further, it is possible to prevent mH of the fiber-reinforced composite material from being disturbed due to mold bite, and it is possible to prevent a decrease in strength. When the fiber-reinforced composite material is heated and cured, the plastic resin is brought into a molten state or a state close to this, so that gas in the fiber-reinforced composite material is easily released. This causes gas to remain in the fiber-reinforced composite!
It is possible to prevent a decrease in the strength of the Li navy blue reinforced composite material.

[Brief explanation of drawings]

Figures 1 to 6 are explanatory diagrams of the conventional example, where Figure 1 is a perspective view showing the state in which the material is clamped, Figure 2 is an enlarged sectional view taken along the line ■-■ in Figure 1, and Figure 3. is a plan view showing the elongation of the material in a part of the corner, and Figure 4 is a plan view showing the elongation of the material in a part of the corner.
l An enlarged plan view showing the movement of the reinforced composite material, Fig. 5 is an enlarged sectional view showing the mold engagement, Fig. 6 is an enlarged plan view showing the deformed state of the molded product at a part of the corner, Figs. 7 and 8. 7 is a layout diagram showing the molding process, and FIG. 8 is an enlarged plan view showing the movement of the IIi fiber-reinforced composite material in a part of the corner. 1...Hollow body made of elastic material 15...Material 16...I
IM reinforced composite material 17...Thermoplastic resin 19...Tape feeder 21...Tape winder 23...Third
0-ra 25...type 29...]-na part

Claims (1)

[Claims] A first step of forming a material by coating the outside of the hollow body made of an elastic material with a fiber-reinforced composite material, and a step of clamping the material with a mold having a part of a corner and applying internal pressure to the hollow body made of an elastic material. A method for manufacturing a fiber-reinforced composite component comprising a second step of heating and curing, further comprising a step of coating the surface of the material with a thermoplastic resin in the form of a film between the first step and the second step. A method of manufacturing a component made of ljAm reinforced composite material, characterized by the following.