JPH01198331A - Manufacture of gear-shape continuous fiber molded body - Google Patents

Abstract

PURPOSE:To deform a continuous fiber into a gear shape so as to follow the shape recovery of flat plates to prevent breakage, by a method wherein the continuous fiber impregnated with a resin is held between two flat plates made of a shape memory alloy in which a gear shape is preliminarily stored and subsequently heated. CONSTITUTION:A pair of upper and lower endless belts 11 made of a shape memory alloy are guided by a large number of guide rollers 12, 12... and guide plates 13, 13. A gear shape is preliminarily stored in each of the endless belts and the endless belts recover the original gear shape during the passage through a heating device 15. A continuous fiber W passes between jet nozzles 16 injecting a resin on the way reaching an inlet A and receives the supply of the resin during this time to be impregnated with the resin. By the continuous rotation of the endless belts and the continuous feed of the continuous fiber W, an infinite length gear-shape continuous fiber molded body P is obtained.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a method for manufacturing a gear-shaped continuous #111m molded body,
More specifically, the present invention relates to a method for manufacturing a molded body that is used as a molding material for a fiber-reinforced resin gear.

(Prior Art) Conventionally, in order to obtain fiber-reinforced resin gears, continuous fibers impregnated with resin (epoxy resin, phenol resin, etc.) are generally used.
Glass fibers, carbon fibers, etc.) were filled into a compression mold, and then heated and compressed to press the material onto the tooth profile of the compression mold to create teeth (for example, in
(Refer to Publication No.-208629). However, according to this method, during compression molding, the continuous fibers (fiber material) impregnated with resin flow largely into the tooth profile of the compression mold, and this causes the problem that the fibers are likely to break. there were.

Therefore, the 8M material is molded into a gear shape in advance, and this gear-shaped continuous edge #I molded body is placed along the tooth profile of the compression mold, and the inside thereof is filled with chopped strands containing resin powder or short fibers. However, the method of heating and compressing it directly has attracted attention and has been used frequently recently.

According to this method, during compression molding, the fiber material hardly flows into the tooth profile of the compression mold, making it possible to prevent the above-mentioned continuous m-fibers from breaking.

Conventionally, in order to obtain the gear-shaped continuous fiber molded article, a flat die 1 having a tooth profile 2 is used as shown in FIG. 5(a).
and a gear 3 are meshed together, and a fiber material W is sandwiched between them to form a gear shape by rotation of the gear 3, or as shown in FIG. It can be made into a gear shape by pinching and rotating both gears, or it can be made into a gear shape by sandwiching the fiber material W between the flat die 1 and the worm 4 and rotating the worm 4, as shown in Figure (c), or by rotating the worm 4. Various methods have been adopted, such as sandwiching a fiber material between a gear 3 and a worm 4 and rotating them to form a gear shape, as shown in (d).

(Problems to be Solved by the Invention) However, according to the above-mentioned conventional method for manufacturing a gear-shaped continuous fiber molded article, for example, the problem shown in FIG. 5(a).

In the method (b), the fiber material W deforms rapidly, so
There is a problem that continuous fibers are easy to break, and on the other hand, as shown in Fig. 5 (
In the methods c) and (d), since twisting force is applied from the worm 4, there is a problem in that the molded article is likely to be twisted.

The present invention has been made in view of the above-mentioned conventional problems.
It is an object of the present invention to provide a manufacturing method that can stably obtain a gear-shaped continuous fiber molded article without causing fiber breakage or deformation.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention is a continuous am cm fiber material in which a resin is impregnated between two flat plates made of a shape memory alloy in which a gear shape is memorized in advance. The main feature is that the continuous fibers are deformed into a gear shape by sandwiching them in a sandwich shape and then heating them to follow the shape recovery of both flat plates.

In the present invention, a reversible shape memory alloy is used as the shape memory alloy. These two flat plates made of shape memory alloy are preferably formed into an endless belt shape. In this case, it is possible to obtain an infinitely long gear-shaped continuous fiber molded product by guiding two discs with a guide roller or the like, partially aligning them, and feeding continuous fibers impregnated with resin between them. can. Further, in the present invention, when the continuous fibers are sandwiched between two flat plates, it is not necessary to sandwich them in close contact with each other, and a slight gap may be provided between the two plates. However, this gap is desirably 1 mm or less in consideration of the accuracy of the tooth shape.

In addition, in the present invention, the types of the continuous fibers and the resin with which they are impregnated are not particularly limited. Can be done.

(Function) In the gear-shaped continuous fiber molded article having the above configuration, by utilizing the deformation of the two flat plates made of shape memory alloy, it is possible to suppress rapid deformation of the fiber material, and the continuous fiber Breakage can be prevented. Moreover, since no torsion force acts on the fiber material, the molded article will not be twisted.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIG. 1 shows an example of a manufacturing apparatus for obtaining a gear-shaped continuous fiber molded article according to the present invention. In the same figure, reference numerals 11 and 11 are endless belts made of shape memory alloy arranged in a pair of upper and lower parts, and each endless belt 11 is
A plurality of guide rollers 12. are partially connected to each other.
12... and guide plates 13, 13. Each endless bell) 11 also has rolling rollers 14,1
4, and are rotated in opposite directions by the driving force of the rolling roller 13. Reference numeral 15 denotes a heating device that can heat a part of the joining range of the pair of endless belts 11 and 11. Thus, each endless belt 11 has a gear shape 11a stored in advance, and recovers its original gear shape while passing through the heating device 15. Note that this gear shape 11a is set to become gradually deeper in the direction of the exit B of the joining range. W is a continuous fiber, which is drawn out from a reel (not shown) and introduced into the entrance A of the joining range of the pair of endless bells h11, 11. The continuous fibers pass between injection nozzles 16 that inject resin on the way to the inlet A,
During this time, resin is supplied and impregnated with it.

When the pair of endless belts 11.11 are now rotated to drive the rolling roller 14 in the manufacturing apparatus described above, each of the endless belts 11.11 is joined at the entrance A and reaches the heating device 15. While passing through, it is heated and deformed into the gear shape 11a. Each endless belt 11 deformed into the gear shape 11a is separated into upper and lower parts at the exit B and passes through the guide plate 13 while maintaining the gear shape 11a, during which time it is cooled by the atmosphere and gradually changes into a flat plate shape. . After that, it reaches the rolling roller 14, where it is shaped into a perfect flat plate, and then goes to the entrance A again.
Repeat this action endlessly.

However, during the lever operation, the continuous fiber W impregnated with the resin supplied from the injection nozzle 16 is introduced between the pair of endless belts 11 from the inlet A, is sandwiched between the two endless belts 11, and is heated. Device 1
5 and there, the gear-shaped continuous fiber molded body P follows the endless belt 11 which recovers its shape to the gear shape 11a.
Then, at exit B, both endless belts 11
．． It separates from 11 and is sent straight forward as it is.

In addition, by continuously rotating each endless belt 11 and continuously feeding the continuous fibers W, a gear-shaped continuous fiber molded body P having an infinite length can be obtained, and productivity is significantly improved.

Moreover, since the gear shape memorized by the endless belt 11 is set to gradually deepen in the direction of the exit B, rapid deformation of the fiber material is suppressed, and the continuous fibers W do not break and become null. Furthermore, the deformation of each endless belt 11 is constant in the plane direction, no torsional force is applied to the fiber material, and the gear-shaped continuous fiber molded body P is stable in shape.

The gear-shaped continuous fiber molded body P obtained as described above is then molded into a gear of a predetermined shape using, for example, a compression mold 20 shown in FIGS. 2 and 3. The compression mold 20 includes a bottomed cylindrical outer mold 21 and the outer mold 2.
It consists of an inner mold 22 which is removably fixed to the center of the mold 1 with bolts and nuts 23, and a punch 24 which is disposed above the outer mold 21 and the inner mold 22 so as to be movable up and down.

In compression molding, first, the gear-shaped continuous fiber molded body P is made to follow the tooth profile 21a on the inner periphery of the outer mold 21 in one layer or in multiple layers, and the inner mold 22 is used to press the gear-shaped continuous fiber molded product P into the core metal 25.
an inner mold 2 which further includes an outer mold 21 and the core bar 25;
2 is filled with an auxiliary material 26 such as resin powder or chopped strands, and then heated for a predetermined time and the punch 24 is moved downward to form the gear-shaped continuous fiber molded body P and the auxiliary material 26 into a predetermined shape. Compress with the pressure of . If the mold is demolded upon completion of compression, a gear 27 in which the gear-shaped continuous fiber molded body P is disposed on the tooth portion 27a can be obtained, as shown in FIG. However, during this compression molding, by aligning the gear-shaped continuous fiber molded body P along the tooth profile 21a of the outer mold 21, the continuous fibers hardly flow into the tooth profile 21a, and therefore the continuous fibers are not broken. The above compression molding conditions include, for example, when polyimide chopped strands are used as the auxiliary material, the heating temperature is 250 to 260°C, and the pressing force is 200 kgf/cm2.
．． It is desirable to select the conditions of heating and pressurizing time of 20 m1n.

(Effects of the Invention) As explained above in detail, according to the method for producing a gear-shaped continuous fiber molded article according to the present invention, continuous This has the effect of not only preventing fiber breakage but also improving the shape accuracy of the molded article.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of an apparatus for carrying out the method for manufacturing a gear-shaped continuous fiber molded article according to the present invention, and FIG. 2 is a schematic diagram showing an example of an apparatus for carrying out the method for producing a gear-shaped continuous fiber molded article according to the present invention. The compression mold is shown in a sectional view taken along the II-II arrow line in Figure 3, Figure 3 is a sectional view taken along the ■-■ arrow line in Figure 2, and Figure 4 is a cross-sectional view taken along the II-II arrow line in Figure 2. The external perspective view of the obtained gear and FIGS. 5(a) to 5(d) are schematic diagrams showing a conventional method for manufacturing a gear-shaped continuous fiber molded body. 11... Flat plate (endless belt) 15 ・
... Heating device W ... Continuous #li textile patent applicant Toyota Motor Corporation representative Patent attorney Yumi Sakai (and 2 others) Figure 2, Figure 3] Endurance, 9'''. Figure 5 (C) 25 Pijunmo; Silkworm; --Zukeichiichi 2■,
””””m27a

Claims (1)

[Claims] (1) Continuous fibers impregnated with resin are sandwiched between two flat plates made of shape memory alloy that have memorized the gear shape in advance, and then the continuous fibers are heated to follow the shape recovery of the flat plates. A method for producing a gear-shaped continuous fiber molded article, which comprises deforming it into a gear shape.