JPH0554416B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to fiber-reinforced plastics (hereinafter referred to as
It concerns the molding method of FRP (FRP), especially the filament winding method.

[Conventional technology and its problems]

The filament winding method, which is one of the FRP molding methods, is, for example, as shown in Figure 3.
Multiple continuous fiber bobbins 2 installed in supply 1
The continuous fiber 3 is drawn out from the
After being impregnated with a matrix resin 5 such as unsaturated polyester resin or epoxy resin in a resin impregnation tank 4, the material is passed through a reciprocating carriage traverse 6 and wound around the circumferential surface of a rotating mandrel 7. This method forms a cylindrical FRP around 7. Generally, this method uses fiber 3
can be wound around the mandrel 7 at any angle, it is possible to form a highly accurate cylindrical FRP body, and it is possible to form a high-performance FRP with a high fiber content vf.

Here, continuous fibers are ultra-fine (e.g., several μm to several tens of μm) continuous fibers bundled together (e.g., several thousand to several tens of μm).
tens of thousands) say something.

Conventionally, the carriage traverse 6 has a fourth
As shown in the figure, a guide hole 8 called an eye is provided to guide the continuous fibers, and the inner cross-sectional shape of the guide hole 8 is designed to prevent cutting and fuzzing due to wear when guiding the continuous fibers. It is formed into a donut-shaped arc. When a plurality of continuous fibers 3 are passed through the guide hole 8 of this carriage traverse 6, since tension is applied to the continuous fibers 3, as shown in FIG. When the winding angle becomes small, a plurality of continuous fibers 3 are attached to the edge of the guide hole 8.
The object skids sideways and becomes focused. For this reason, when increasing the number of continuous fibers 3 in order to efficiently manufacture thin and wide FRP around the mandrel 7, each continuous fiber 3 does not spread in the width direction (direction of the rotation axis of the mandrel). There is a problem that the thickness of the FRP that is wrapped around the mandrel 7 becomes thicker in the thickness direction and becomes unstable, and that the surface thereof becomes uneven. Furthermore, when the irregularities on the surface of the molded article are processed by machining, most of the fibers on the surface are cut, so there is a problem that the strength becomes extremely weak.

Therefore, this invention aims to enable the production of high-quality FRP in which each layer of FRP is thinned by providing a method for winding multiple continuous fibers around a mandrel without converging them. It is.

In other words, the purpose of the present application is to spread one continuous fiber sufficiently in a stable state, and while maintaining this state, even if multiple continuous fibers are supplied, the number of The aim is to provide a spread of fibers.

[Means for solving problems]

In order to solve the above problems, this invention
A plurality of pins perpendicular to the direction of the rotation axis of the mandrel are provided in parallel on the carriage traverse, and one continuous fiber is passed between each pin to spread the plurality of continuous fibers in the direction of the rotation axis of the mandrel. It was designed so that it could be wrapped around a mandrel.

[Effect]

In the above method, by passing the plurality of continuous fibers one by one between each of the plurality of pins perpendicular to the direction of the rotation axis of the mandrel, the plurality of continuous fibers are prevented from converging. Since the continuous fibers are spread in the direction of the rotation axis of the mandrel, each continuous fiber is regularly wound around the circumferential surface of the mandrel in parallel in the direction of the rotation axis of the mandrel. Therefore, it is possible to solve the problems that occurred with the conventional donut-shaped arc-shaped guide hole as described below, and it is possible to reduce the thickness of each layer that makes up FRP, making it possible to reduce the surface of the molded product. It is possible to prevent unevenness from occurring on the surface.

When a continuous fiber is passed between two pins,
The path of the continuous fibers at the pin part is uniquely determined by the front stage guide and the landing point of the mandrel, and at this time, the continuous fibers are aligned due to the R shape of the pin cross section, and the diameter of the guide hole is infinite. This makes it possible for the continuous fibers to spread even further than the guide holes.

In the case of guide holes, since multiple continuous fibers are introduced into the guide hole, it is necessary to satisfy both the expansion of the tape width and the convergence of the fibers at the same time, and there are cases where the expansion of the tape width is sacrificed. However, in this invention, the fibers are spread by pins one by one, and the fibers are aligned by the distance between the pins. Therefore, even if the number of continuous fibers supplied is increased, the spread of the fibers is not narrowed. Needless to say, since the continuous fibers are passed between the pins, the continuous fibers do not cross each other, making it possible to spread one fiber multiple times.

In helical winding, a pattern is formed by alternating right and left rows, but in the case of guide holes, the inner diameter of the guide hole, that is, the curvature, is the main factor from the viewpoint of focusing, and the number of continuous fibers introduced increases. Therefore, a guide hole with a larger inner diameter is required. In this case, the arrangement of the continuous fibers may become unstable at the time of winding turn at the end of the mandrel transitioning from left to right, and alignment properties may deteriorate; however, in this invention, the left The right and left sides of the pins of the continuous fibers act on the rows and right rows, and the distance between the pins only needs to be opened by the extent of the continuous fibers, so there is no instability factor as seen in guide holes.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

The carriage traverse 6' of this invention has a first
As shown in the figure, a guide rod 10 and a threaded rod 11 are provided parallel to the rotation axis 9 of the mandrel 7, a moving body 12 is attached to the guide rod 10 and the threaded rod 11, and the moving body 12 is attached to the threaded rod 11. Therefore, the mandrel 7 is made to reciprocate in the direction of the rotation axis 9. The moving body 12 includes a mandrel 7
A plurality of pins 13 that are orthogonal to the rotation axis 9 of the mandrel 7 are protruded in parallel on the surface facing the mandrel 7 . A plurality of continuous fibers 3 are passed between each of the pins 13, one by one. On this occasion,
A plurality of guides 14 parallel to the guide rod 10 are attached to the upper surface of the movable body 12 using a support frame 15, and before guiding the continuous fibers 3 between the pins 13, the continuous fibers 3 are divided one by one in advance. This is effective in preventing the continuous fibers 3 from becoming fluffy or adjusting the winding width.

The continuous fibers 3 passing between the pins 13 are wound on the mandrel 7 at predetermined intervals depending on the spacing between the pins 13. Therefore, the distance between each pin 13 is adjusted as appropriate depending on the number of continuous fibers 3, the type of continuous fibers 3, the winding angle, etc.

〔effect〕

Because the present invention is as described above, even when the number of continuous fibers wound around the mandrel is increased or when the winding angle is set to a small angle of 60°, especially 45° or less, the continuous fibers can be Since the continuous fibers are spread out one by one in the direction of the rotation axis of the mandrel without convergence, the continuous fibers can be regularly wound in parallel around the mandrel.

Therefore, according to the present invention, it is possible to make the continuous fibers wound around the mandrel thinner and wider.
This has the effect of shortening the winding time and improving the reliability of FRP.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the carriage traverse and mandrel portion of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a schematic diagram showing the entire conventional example, and FIG.
The figure is a schematic plan view showing a conventional carriage traverse and mandrel portion. 3... Continuous fiber, 6... Carrette traverse, 7... Mandrel, 13... Pin.

Claims (1)

[Claims] 1 In a method for forming fiber-reinforced plastics in which a plurality of continuous fibers impregnated with resin are wound around the circumferential surface of a rotating mandrel through a reciprocating carriage traverse, the rotation of the mandrel is applied to the carriage traverse. A plurality of pins are installed in parallel perpendicular to the axial direction, and one continuous fiber is placed between each pin.
A method for forming fiber-reinforced plastics, which is characterized by passing a plurality of continuous fibers one by one and winding them around a mandrel while spreading them in the direction of the rotation axis of the mandrel.