JPS6334125A - Manufacturing method of fiber reinforced plastics - Google Patents

Abstract

PURPOSE:To make it possible to uniformly and broadly wind in the form of a tape by a method wherein a guide bar, through which continuous resin- impregnated fibers passed through the eye part of a traverse are fed to the surface of a mandrel, is provided so as to keep the direction of the axis center line of the guide bar at an angle of as near 90 deg. as possible with respect to the direction of the continuous fibers running from the guide bar to the mandrel. CONSTITUTION:An eye 6 consists of a collared outer cylinder 61, bearings 62, a collared inner cylinder 63 and a columnar guide bar 65, which is laterally supported between a pair of fulcrum shafts 63 and 64. The inner cylinder 63 together with the guide bar 65 is rotated forward and backward by the predetermined angle through the advancement and retreat of a driving shaft 68, which is connected through a hinge pin to an arm 66 attached to the outer periphery of the collar of the inner cylinder, of a driving means 67 so as to keep the direction of the shaft center line of the guide bar 65 at an angle of as near 90 deg. as possible with respect to the feeding directions of long fibers A in order to feed the long fibers A to a mandrel 5. Thus, the feeding positions of the continuous fibers on the guide bar 65 are made to be constant and at the same time the fibers are fully broadened by means of the guide bar 65.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is directed to manufacturing fiber-reinforced plastics, particularly fiber-reinforced plastics (hereinafter referred to as FRP) using long fibers, using a filament winding method (hereinafter referred to as FW). Specifically, it relates to a method that enables uniform and wide tape wrapping in order to efficiently produce high-quality products.

[Conventional technology]

Forming methods for high-performance FRP include press molding, resin injection, etc., but for rotationally symmetrical products such as cylinders, FW determination is required due to uniformity and arbitrariness of fiber arrangement, high volume fiber content, etc. has been adopted.

As shown in FIG. 5, in the FW method, long fibers A supplied from a supply section 1 are passed through a resin bath 2 and impregnated with resin.
After further aligning them, they are passed through the eye 4 of the reciprocating carriage traverse 3 to be converged and wound around the rotating mandrel 5, whereupon the matrix resin is cured by heating, etc. This is a method of removing the mold.

In the above-mentioned FW method, the tape width of the fiber is uniquely determined by the eye structure, but conventionally, the winding is performed using a donut-shaped ring formed in a wire drawing die as shown in Fig. 6. It is a touch to use the eye.

[Problem that the invention seeks to solve]

When attempting to mass produce FRP based on the FW Law,
First, it may be possible to speed up the winding, but this method not only impairs the impregnation of the resin into the fibers, but also increases the fuzziness of the fibers, which may reduce the performance of the FRP.

Therefore, another method may be to increase the number of fibers during winding. However, in this case, in order to enable precision winding in which the wall thickness of each layer is limited, it is necessary to widen the tape when winding it around a mandrel to eliminate the increase in tape thickness due to increased fibers. On the other hand, in the conventional eye structure described above, the fibers introduced into the eye hit the inner surface of the eye, where they are collected and brought out, so the more fibers are bundled, the more difficult it is to align them. The problem arises that the inner radius of the eye must also be thick.

Note that as a countermeasure to this problem, it is possible to make the eye hole a long hole with an infinitely large radius of curvature on the inner surface, but if this method is adopted, fiber convergence in the longitudinal direction of the eye hole at the eye portion will be reduced. Almost no force is applied, and as a result, the point at which the fibers are drawn out at the eye portion is not constant, and the winding angle of the fibers is not kept constant, making winding impossible.

This invention was made in view of the above, and the product ffF
The purpose is to enable uniform and wide tape winding for highly efficient production of RP.

[Means for solving problems]

The method of the present invention which achieves the above object is to provide a guide rod in the carriage traverse in the FW method to feed the resin-impregnated continuous fibers that have passed through the eye portion of the traverse toward the mandrel surface. The winding is characterized in that the orientation of the axis of the guide rod is maintained as much as possible at 90° with respect to the direction of propagation of the continuous fibers from the guide rod to the mandrel.

[Effect]

The direction of the guide rod with respect to the fibers fed out of the mandrel (
When the angle between the fibers and the unrolled fibers approaches 90°, the fibers become difficult to slip when wrapped around the guide rod, which makes it possible to increase the curvature of the guide rod, and ultimately to make the guide rod straight. It is also possible to form it into a cylinder.

For this reason, compared to conventional eyes, the fibers on the guide rod are smaller! i The focusing power becomes smaller. However, although the spreadability of the fibers improves due to the decrease in the focusing force, the eyes prevent the fibers from spreading beyond a predetermined width. Therefore, it is possible to stably widen the fiber tape and to align it well, and the point at which it is fed onto the mandrel can also be kept constant.

〔Example〕

An example of the method of the present invention will be explained based on the attached FIGS. 1 to 4. Figures 2 and 3 show an example of an eye that enables the method of the invention. The eye 6 includes an outer cylinder 61 with a flange fixed to the carrier body, an inner cylinder 63 with a flange rotatably supported by the outer cylinder via a bearing 62, and an inner cylinder 63 with a flange that hangs down from the lower end of the inner cylinder. It consists of a cylindrical guide rod 65 that is supported laterally between a pair of attached support shafts 64 and 64. A drive shaft 68 of a drive means 67 such as a cylinder actuator or a servo motor is connected to an arm 66 attached to the outer periphery of the inner cylinder's flange through a hinge pin, and as the drive shaft 68 moves back and forth, the inner cylinder 63 is guided. Together with the rod 65, it can be rotated by a predetermined angle in forward and reverse directions.

Note that the drive shaft 68 shown in FIG. 3 needs to synchronize the rotation of the mandrel 5 with the axial position of the carriage traverse 3, and the rotation angle when the carriage traverse moves clockwise is α. (See FIG. 3), the rotation angle when moving leftward is naturally -α.

According to the present invention, as described above, the direction of the axis of the guide rod 65 is maintained at 90 degrees in the direction of feeding out the long fibers A shown in FIG. 1, and the long fibers A are fed out onto the mandrel 5. According to this method, the position at which the continuous fibers are fed out on the guide rod 65 is made constant, and the width of the fibers is sufficiently widened by the guide rod, thereby achieving the intended purpose of the present application.

In addition, in FIG. 1, a guide rod 6 is installed on the entrance side of the eye 6.
A second guide rod 7 having a different direction from that of guide rod 5 is installed, and the guide rod 6
Placing the rotation center of the guide rod 65 on the line connecting the center of gravity of the fibers on the second guide rod 7 and the center of gravity of the fibers on the second guide rod 7 means that the winding on the guide rod 65 will prevent the fibers from slipping. It is effective to do less.

Further, the angle between the winding and the mandrel axis of the fiber changes continuously or discontinuously at both ends of the mandrel.

In response to this change, it is possible to synchronize the drive means 67 described above and adjust the direction of the guide rod 65 so that the angle of 90° is always maintained. For example, as shown in FIG. In addition, by providing an annular R protrusion 6s like a conventional eye on the inner cylinder 63 of the eye and allowing the fiber to slide within the inner radius rg of the protrusion, subtle changes in the winding angle at both ends of the mandrel can be avoided. On the other hand, the direction of the guide rod is set to +α rotation position and -
It can also be said that dealing with only two rotational positions of α is effective in terms of simplifying the work.

〔effect〕

As described above, in the method of the present invention, a guide rod is provided on the exit side of the eye, and fiber winding is performed using the guide rod as a feeding point onto the mandrel. While maintaining the angle of 90'' as much as possible to achieve a stable spread of the fibers, winding a wide tape with an increased number of fibers,
It has the effect of being able to wrap the tape uniformly and with the same wall thickness as the width tape, and is extremely effective when used in the mass production of FRP cylindrical bodies such as rotating bodies that require wall thickness accuracy. It is true.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the process of winding fibers around a mandrel in the method of the present invention, Fig. 2 is a sectional view showing an example of an eye used in the method, Fig. 3 is a plan view thereof, and Fig. 4 5 is a partial sectional view showing a modified example of the inner cylinder of the eye, (A) in FIG. 5 is a side view of the conventional FW method, (B) is a front view of the mandrel part in (A), FIG. 6 is a partially cutaway front view of a conventional eye. 1... Supply part, 2... Resin bath, 3... Carrenoji traverse, 6... Eye for, 61... Outer cylinder, 63... ...Inner cylinder, 64 ... Support shaft, 65 ... Guide rod,
67... Drive means, A... Long fiber.

Claims (2)

[Claims] (1) In a method for forming fiber-reinforced plastics, in which continuous fibers impregnated with resin are wound around the outer circumferential surface of a rotating mandrel through a reciprocating carriage traverse, and cured and molded, the above-mentioned carriage traverse is A guide rod is provided to feed out the resin-impregnated continuous fibers that have passed through the eye portion of the traverse toward the mandrel surface, and while the fibers are being wound around the mandrel, the above-mentioned guide rod is provided to feed out the resin-impregnated continuous fibers that have passed through the eye of the traverse toward the mandrel surface. A method for producing fiber-reinforced plastics, characterized in that the orientation of the axis of the guide rod is maintained at 90° as much as possible. (2) A second guide which supports the guide rod rotatably on a plane parallel to the mandrel axis, and whose rotation center is located between the center of gravity of the fibers on the guide rod and the entrance side of the eye portion. The method for manufacturing fiber-reinforced plastics according to claim 1, wherein the fibers are placed on a line connecting the center of gravity of the fibers on the rod.