JPH0732497A - Pultrusion molding method for fiber reinforced plastic members - Google Patents

Abstract

(57) [Summary] [Object] The present invention aims to mold a fiber-reinforced resin rod having a large diameter. [Structure] A resin 3 is attached to a fiber 2 continuously fed from a feeding portion 1, and the fiber 2 is converged and heated in a aligned state by a molding portion 4 to obtain a rod-shaped fiber-reinforced resin member 5 having a desired diameter. A pultrusion molding method for molding, which has a diameter L
In the case of molding the fiber-reinforced resin member 5 of No. 1, the resin-adhered fiber 2 in an amount necessary for molding a bundle having a diameter (L-α) is fed from the feeding unit 1 and the first molding unit S on the most upstream side.
1 in order to bundle the fibers 2 to a diameter (L-α) and heat the bundle to a pre-cured state, and subsequently to make the bundle of diameter (L-α) into a bundle of diameter L The resin-attached fibers 2'of a certain amount are continuously added to the bundle of diameter (L-α)
In the final forming portion SL located on the downstream side of the forming portion S1, the bundle is made to have a diameter L, and the entire bundle having the diameter L is heated until it is cured to form the fiber-reinforced resin member 5 having a diameter L.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a rod-shaped fiber reinforced resin member having an arbitrary diameter.

[0002]

2. Description of the Related Art Conventionally, there is a pultrusion molding method as a method for molding a rod-shaped fiber-reinforced resin member 5. In this pultrusion molding method, as shown in FIG. 1, a resin 2 is impregnated in a fiber 2 continuously fed from a feeding portion 1, and the fed resin-impregnated fiber 2 is aligned by a die (forming portion 4). In this method, the rod-shaped fiber-reinforced resin member 5 having a desired diameter is formed by converging and heating in (2) (the same components as those in this embodiment are designated by the same reference numerals).

This conventional pultrusion molding method can theoretically mold a rod-shaped fiber-reinforced resin member 5 having a large diameter by appropriately setting the amount of fibers continuously fed and the diameter of a die. In reality, the rod-shaped fiber-reinforced resin member 5 having a certain diameter is the limit.

This is due to the following reason.

When molding the rod-shaped fiber-reinforced resin member 5 having a large diameter, the drawing speed must be slowed in the above-mentioned drawing method.

If the drawing speed is increased, the heating by the die does not transfer heat to the core, and the core is in an uncured state.

Therefore, a rod-shaped fiber-reinforced resin member 5 having a large diameter is used.
In the case of molding, taking the heat transfer to the core into consideration, the drawing speed must be considerably slowed down, workability is extremely lowered, and manufacturing cost is increased.

Although it is possible to achieve heating up to the core by lengthening the die and lengthening the heating zone instead of slowing down the drawing speed, the longer the die, the greater the drawing friction resistance and The surface of the molded product is easy to scrape,
Therefore, there arises a problem that it is difficult to pull out. Generally, the heating zone has a limit of about 100 cm to 150 cm.

If the drawing speed is set too slow, reaction heat is accumulated in the core, the core burns, and cracks occur in the core, which lowers the production efficiency. Therefore,
The advantage of pultrusion molding, which is continuous molding, is significantly impaired.

Therefore, at present, it is difficult to form the rod-shaped fiber reinforced resin member 5 having a large diameter by the pultrusion method as a practical problem. In fact, the rod-shaped fiber reinforced resin member 5 having a certain diameter is actually formed. The pultrusion molding method is adopted only when molding, and the pultrusion molding method is not adopted for molding the rod-shaped fiber-reinforced resin member 5 having a large diameter, but a filament winding method or the like is adopted.

In practice, the pultrusion molding method is often used for molding the rod-shaped fiber-reinforced resin member 5 having a diameter of 0.5 to 30 mm.

Incidentally, in the pultrusion molding method, a means for avoiding heating failure up to the core portion by irradiating microwaves in the middle instead of reducing the drawing speed so much has recently been carried out. Since it has to be provided, there is a problem that the entire device is complicated and the cost is high.
In addition, actually, it is very troublesome to adjust the irradiation amount of microwaves and select the wavelength of microwaves. From this point of view, the means is not so often adopted.

The present invention relates to a pultrusion molding method for a fiber-reinforced resin member that completely solves the above problems. According to the present invention, a rod-shaped fiber-reinforced resin member having an arbitrary diameter can be easily molded. Become.

[0014]

The gist of the present invention will be described with reference to the accompanying drawings.

The resin 3 is attached to the fibers 2 continuously fed from the feeding portion 1, and the fibers 2 are converged and heated by the molding portion 4 in a aligned state to obtain a rod-shaped fiber-reinforced resin member 5 having a desired diameter. In the pultrusion molding method for molding, in the case of molding the fiber-reinforced resin member 5 having the diameter L, the resin-adhered fiber 2 in an amount necessary for molding the bundle having the diameter (L-α) from the feeding portion 1 is used. The fibers 2 are fed out to converge the fibers 2 to a diameter (L-α) in the first molding portion S1 on the most upstream side, and the bundle is heated to a pre-cured state, and then a bundle of diameter (L-α) is formed. The first amount is obtained by continuously adding the resin-attached fibers 2 ′ in an amount of α necessary for forming a bundle having a diameter L to the bundle having a diameter (L−α).
In the final forming portion SL located on the downstream side of the forming portion S1, the bundle is made to have a diameter L, and the entire bundle having the diameter L is heated until it is cured to form the fiber-reinforced resin member 5 having the diameter L. The present invention relates to a pultrusion molding method for a characteristic fiber-reinforced resin member.

The resin 3 is attached to the fibers 2 continuously fed from the feeding unit 1, and the fibers 2 are focused and heated in a aligned state by the molding unit 4 to obtain a rod-shaped fiber-reinforced resin member 5 having a desired diameter. It is a pultrusion molding method for molding, and in the case of molding a fiber reinforced resin member 5 having a diameter L, an amount of resin necessary for molding a bundle having a diameter (L-α ₂ -α ₁ ) from the feeding portion 1 The attached fiber 2 is fed out and the first on the most upstream side
In the molding section S1, the fibers 2 are bundled to a diameter (L-α ₂ -α ₁ ) and the bundle is heated to a pre-cured state.
The resin-attached fiber 2'of the amount of α ₁ necessary for making the bundle of (L-α ₂ -α ₁ ) into the bundle of diameter (L-α ₂ ) has the diameter (L-α ₂ -α ₁ )
In the second molding section S2 located downstream of the first molding section S1 by continuously adding the converging body to the diameter (L
-Α ₂ ) and heat the focus to a pre-cured state,
Then, continuously added to a bundle of size (L-alpha ₂₎ diameter alpha ₂ of the resin adhered fiber 2 'required for the bundle of the bundle of the diameter L of (L-alpha ₂₎ Then, in the final forming portion SL located on the downstream side of the second forming portion S2, the focusing body is made to have a diameter L, and the entire focusing body having the diameter L is heated until it is cured, and the diameter L
The fiber-reinforced resin member 5 is molded, and the fiber-reinforced resin member 5 is drawn.

A resin 3 is attached to the fibers 2 continuously fed from the feeding portion 1, and the fibers 2 are focused and heated in a aligned state by the molding portion 4 to obtain a rod-shaped fiber-reinforced resin member 5 having a desired diameter. In the pultrusion molding method for molding, in the case of molding the fiber reinforced resin member 5 having the diameter L, the amount of the amount necessary for molding the bundle having the diameter (L-αn -... -α ₁ ) from the feeding portion 1 is used. The resin-adhered fiber 2 is fed out, and the fiber 2 is fed at a diameter (L-αn -...
₁ ) and heating the bundle to a pre-cured state, and then a bundle having a diameter (L-αn -...- α ₁ ) having a diameter (L-αn -...-
alpha ₂₎ alpha ₁ amount necessary for the focusing of the resin attachment fibers 2 '
Are continuously added to the converging body having a diameter (L-αn -... -α ₁ ), and the converging body is moved to a diameter (L-αn- ...- α ₂ ) and heat the bundle to a pre-cured state, and then repeat the same treatment as above, and then make the bundle of diameter (L-αn) into the bundle of diameter L. The diameter of the resin-attached fiber 2'for the necessary αn
The n-th molding portion Sn is continuously added to the (L-αn) focusing body.
In the final forming portion SL located on the downstream side of the fiber, the bundle is made to have a diameter L, and the entire bundle having the diameter L is heated until it is cured to form the fiber-reinforced resin member 5 having a diameter L. The present invention relates to a pultrusion molding method for a fiber-reinforced resin member.

[0018]

Since the method is to add the resin-attached fibers 2'in stages, it is not necessary to slow down the drawing speed.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show one embodiment of the present invention.
This will be described below.

The drawing shows a die S (molding portion 4) having a diameter (the diameter of the hole through which the fiber passes. The same applies hereinafter) of 15 mm.
1. Die S2 with a diameter of 30 mm, Die SL with a diameter of 45 mm
Is a case where the rod-shaped fiber reinforced resin member 5 having an outer diameter of 45 mm is formed in parallel.

The fiber may be glass fiber, carbon fiber or the like, and the resin may be any resin as long as it is a thermosetting resin such as epoxy resin.

A predetermined amount of the resin-impregnated fiber 2 is continuously fed out from the feeding portion 1 and passed through the die S1, and the outer diameter 1
5 mm surface layer semi-cured rod is molded, subsequently, a predetermined amount of resin-impregnated fiber 2'is continuously added and passed through the die S2 to mold a surface layer semi-cured rod with an outer diameter of 30 mm, Then, a predetermined amount of the resin-impregnated fiber 2'is continuously added and passed through the die SL to mold a cured rod having an outer diameter of 45 mm.

Reference numeral 3'is a resin for adhering to the additional fiber 2 ', 6 is a squeeze roll, 7 is a take-up device, and 8 is a cutting part.

What is important here is that when the rod passes through the die S1, the rod is not cured (the epoxy resin is not sufficiently reacted) and when the surface layer is in a semi-cured state (state before reaction), the next fiber 2 ' Is to set conditions such as the heating temperature of each die S1, S2, SL, the drawing speed of the rod, and so on. The surface layer may be in a semi-cured state, and the core may be cured. Then, the entire rod may be hardened at the time of passing the last die SL. The surface layer does not have to reach a semi-cured state (the core portion may be uncured). The point is that the dies do not cure, and the next die reacts to gel (apparently solidify) or cure.

For example, when the rod surface layer is cured when passing through the die S1, and the resin-impregnated fiber 2'is added to the cured surface layer, a layer is finally formed in the finished rod, causing a problem of delamination. This is because the strength is insufficient.

According to the present embodiment, although the rod having the outer diameter of 45 mm is molded, the pulling speed is the same as that of the rod having the outer diameter of 15 mm, and the manufacturing efficiency is greatly improved. become.

Since the rod that has passed through the die S1 is heated to a predetermined temperature, if the resin-impregnated fiber 2'is not added and if it enters the die S2 as it is, the reaction of the resin proceeds,
The temperature rises to the kick-off temperature (about 150 ° C in the case of epoxy resin), and when it reaches the kick-off temperature, a rapid temperature rise (up to about 300 ° C) occurs.
Due to this violent reaction, the expansion and contraction of the resin is greatly expressed,
A crack will occur in the center.

However, in the case of this embodiment, since the resin-impregnated fiber 2'is newly added to the rod that has passed through the die S1, the rod is cooled by this additional fiber 2 ', and such a problem is also avoided. You can Therefore, from this viewpoint, the setting of the distance between the dies is also important. Specific examples are as follows. According to this embodiment, a rod having an outer diameter of 45 mm with good quality is molded.

3, 4 and 5 are explanatory views showing the outer diameter of the fiber reinforced resin member 5 at the x, y and z positions in FIG.

From the feeding section (creel) 1, 60 pieces of glass roving R4630 count (fiber 2) were continuously drawn out and impregnated with epoxy resin in a resin tank, and the excess resin was squeezed with a squeezing roll 6 15 mmφ die S1
To form a semi-hardened rod with an outer diameter of 15 mmφ, and then add 175 R4630 counts (fiber 2 ′) impregnated with resin in the same manner continuously to add a die S with a diameter of 30 mmφ.
2 to form a semi-hardened rod with an outer diameter of 30 mmφ, and similarly add 290 R4630 counts (fiber 2 ′) continuously and pass through a die SL with a diameter of 45 mmφ to obtain an outer diameter of 45 mmφ. , Glass roving volume content 60
% Cured rod was obtained. The withdrawal speed in this case is 30-
40 cm / min (equal to the speed when a rod having an outer diameter of 15 mmφ is drawn), the temperature of the die S1 is 140 ° C., the temperature of the die S2 is 145 ° C., and the temperature of the die SL is 155 ° C. In this case, the length a of the dice S1 and the dice S2,
b is about 60 cm, and the length c of the die SL is about 100 cm,
Distance d between dice S1 and dice S2 is about 70 cm, dice S
The distance e between the two dies SL is about 120 cm.

In order to obtain a rod having an outer diameter of 45 mm by drawing, the drawing speed must be about several cm / min. It is impossible to put this into practice in terms of mass production. According to the present embodiment, such a problem is completely solved.

According to this embodiment, the outer diameter is 60 to 70 mm.
It is possible to obtain a rod of a certain degree without any trouble.

[0033]

As described above, the present invention makes it possible to mold a rod-shaped fiber-reinforced resin member having an arbitrary diameter.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a pultrusion molding method.

FIG. 2 is an explanatory diagram of the present embodiment.

FIG. 3 is an explanatory view of the outer diameter of the fiber reinforced resin member according to the present embodiment at the x position in FIG.

FIG. 4 is an explanatory view of the outer diameter of the fiber-reinforced resin member according to the present embodiment at the y position in FIG.

5 is an explanatory diagram of the outer diameter of the fiber reinforced resin member according to the present embodiment at the z position in FIG.

[Explanation of symbols]

 1 Feeding Part 2 Fiber 2'Fiber 3 Resin 4 Molding Part 5 Fiber Reinforced Resin Member S1 First Molding Part S2 Second Molding Part SL Final Molding Part

Claims (3)

[Claims] 1. A pultrusion molding for molding a rod-shaped fiber-reinforced resin member to a desired diameter by depositing a resin on fibers continuously fed from a feeding unit and heating the fibers in a aligned state by a shaping unit to focus and heat the fibers. Method for molding a fiber-reinforced resin member having a diameter L,
An amount of resin-adhered fiber required for forming the (L-α) bundle is fed out to focus the fiber to a diameter (L-α) in the first molding section S1 on the most upstream side, and After heating to a state before curing, resin-attached fibers in an amount of α necessary to make a bundle of diameter (L-α) into a bundle of diameter L are continuously applied to the bundle of diameter (L-α). In addition to the above, the final forming section SL located on the downstream side of the first forming section S1 has a diameter L of the focusing body, and the entire focusing body having the diameter L is heated until it is cured and the diameter L
1. A pultrusion molding method for a fiber-reinforced resin member, which comprises molding the fiber-reinforced resin member. 2. A pultrusion molding for molding a rod-shaped fiber-reinforced resin member to a desired diameter by depositing a resin on the fibers continuously fed from the feeding unit and heating the fibers in a aligned state by the molding unit to focus and heat the fibers. Method for molding a fiber-reinforced resin member having a diameter L,
(L-α ₂ -α ₁ ) The amount of resin-adhered fiber required to form the bundle is fed out, and the fiber has a diameter (L-α ₂ -α ₁ ) at the most upstream side first molding portion S1. Α ₁ required for converting the bundle having the diameter (L-α ₂ -α ₁ ) into the bundle having the diameter (L-α ₂ ). A second molding portion S located downstream of the first molding portion S1 by continuously adding a certain amount of resin-attached fibers to a bundle having a diameter (L-α ₂ -α ₁ ).
And focuses the said population Tabatai in diameter (L-alpha ₂₎ in 2 to heat the said population Tabatai until hardened before state, followed by diameter (L-alpha ₂₎ a bundle of for the focusing of the diameter L of The amount of α ₂ resin-adhered fiber required for the above is continuously added to the bundle of diameter (L−α ₂ ), and the diameter of the bundle is increased in the final forming section SL located on the downstream side of the second forming section S2. A pultrusion method for a fiber-reinforced resin member, characterized in that the fiber-reinforced resin member having a diameter L is formed by heating the entire bundle having a diameter L and curing the bundle. 3. A pultrusion molding for molding a rod-shaped fiber-reinforced resin member to a desired diameter by applying resin to fibers continuously fed from a feeding portion and heating the fibers in a aligned state by a shaping portion to heat the fibers to a desired diameter. Method for molding a fiber-reinforced resin member having a diameter L,
(L-αn -...- α ₁ ) The amount of resin-adhered fiber required to form the bundle is fed out, and the fiber has a diameter (L-αn -... -α) in the first forming section S1 on the most upstream side. ₁ ) and heating the bundle to a pre-cured state, followed by a diameter (L-αn -...
The α ₁ amount of the resin-adhered fiber necessary for making the bundle of −α ₁ ) into the bundle of diameter (L−αn −... −α ₂ ) has the diameter (L−αn −...−
α ₁ ) is continuously added to the converging body, and the converging body is radiated in the second molding section S2 located on the downstream side of the first molding section S1.
(L-αn -...- α ₂ ) and the bundle is heated to a pre-curing state, and then the same treatment as described above is repeated. The amount of resin-adhered fiber required to form the bundle of (n) is continuously added to the bundle of diameter (L-αn), and the bundle is converged in the final forming portion SL located on the downstream side of the n-th forming portion Sn. The diameter L of the body and the diameter L
The pultrusion method for a fiber-reinforced resin member, characterized in that the fiber-reinforced resin member having a diameter L is molded by heating the entire bundle to cure.