JPH0720672B2 - Filament winding method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fiber-reinforced plastics (hereinafter referred to as FRP), and particularly to a filament winding method (hereinafter referred to as FW method) for producing FRP using long fibers. , In particular, it relates to the FW method, which allows a large number of wound fibers to be formed into a wide tape and wound around a mandrel with high precision.

[Conventional technology and its problems]

In the FW method, as shown in FIG. 1, a large number of wound fibers 2 supplied from a supply unit 1 are passed through a resin bath 3 to impregnate a resin, and then wound around a mandrel 4 which rotates,
This is a method in which the resin impregnated in the wound fiber 2 is cured and then released from the mold. This method is used for molding rotationally symmetrical FRP such as a cylindrical body.

Conventionally, when the winding fiber 2 is wound around the mandrel 4, the eye of the carriage traverse 5 that axially reciprocates a large number of winding fibers 2 with respect to the mandrel 4 in consideration of mass productivity. It is made to reciprocate in the axial direction of the mandrel 4 while being aligned in the form of a tape by passing through 6.

In such a FW method, as shown in FIG.
When the tape-shaped wound fiber 2 is helically wound around the mandrel 4 obliquely, the cone portion 7 having the true cylindrical portion 8 on the small diameter side is connected to both ends of the mandrel 4, and the tape-shaped wound fiber 2 is wound. When the moving direction of the attachment fiber 2 is changed to the opposite direction at both ends of the mandrel 4, the tape-shaped winding fiber 2 is prevented from being caught by the right cylindrical portion 8 of the cone portion 7 and being displaced in the axial direction of the mandrel 4. There is.

By the way, in the case of the helical winding pattern, when the tape-shaped continuous fiber 2 is wound around the mandrel 4, the tape-shaped continuous fiber 2 is kept at a constant winding angle α.
When it is wound while reciprocating at a constant speed, the tape-shaped continuous fiber 2 is wound on the same position on the peripheral surface of the mandrel 4 at the first and second reciprocations, and is continuously wound on the peripheral surface of the mandrel 4. The fiber 2 cannot be wound without a gap. For this reason, conventionally, the winding position of the tape-shaped continuous fiber 2 is the axial width of the tape-shaped continuous fiber 2 on the circumferential surface of the mandrel 4 while the tape-shaped continuous fiber 2 makes one reciprocating movement on the mandrel 4. The tape-shaped continuous fiber 2 is wound so as to be displaced so as to be wound around the peripheral surface of the mandrel 4 without any gap.

In this conventional method, an error occurs in the winding angle while the tape-shaped continuous fiber 2 moves from one end of the mandrel 4 to the other end, and next, there is a problem.

In the helical winding pattern, the tape-shaped continuous fiber 2 may make one reciprocation of the mandrel 4 to be offset by the tape width, or may make two or more reciprocations of butting. In the conventional method, uniform winding is impossible as shown in the following example of butting in two reciprocations, except in the case of butting in one reciprocation.

That is, as shown in FIG. 5, when an arbitrary cross section of the mandrel 4 in the circumferential direction is taken and the arrangement of the fibers in the right row of the tape-shaped continuous fiber 2 is considered, they are wound in the order of 1 → 2 → 3 → 4. It is the first time that they are butted at position 3. Where 1 to 2
The position of cannot be arranged symmetrically (1 and 3 are in contact with each other, so there is a 1/2 shift in 2). Therefore, the length of A is different from the length of B, and part A is n-1 times. Even if it is covered with the tape-shaped continuous fiber 2, there is a problem that a gap is still formed by c at the n-th time. As the tape width of the tape-shaped continuous fiber 2 becomes wider, this gap becomes larger and uniform winding is impossible. It was.

Therefore, the present invention is intended to provide a FW method in which tape-shaped continuous fibers can be wound around the peripheral surface of a mandrel in a state of abutment in a uniform manner without any gap in the axial direction.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention uses a mandrel when reversing the moving direction of the tape-shaped continuous fiber by hooking the tape-shaped continuous fiber on the right cylindrical portion of the cone portion connected to both ends of the mandrel. When the tape-shaped continuous fiber is wound on the mandrel, the winding start part at the end of the mandrel is displaced in the axial direction of the mandrel by the tape width of the tape-shaped continuous fiber. The peripheral speed ratio is kept constant and the winding angle of the tape-shaped continuous fiber is maintained at a predetermined angle.

[Action]

According to the above method, in the cone portion of the mandrel end portion, the winding start portion of the end portion of the mandrel is displaced in the axial direction of the mandrel by the tape width of the tape-shaped continuous fiber at the first and second reciprocations. The second reciprocating tape-shaped continuous fiber is wound around the mandrel so as to abut one side of the winding pattern formed on the. On the mandrel peripheral surface, the winding angle of the tape-shaped continuous fiber is maintained at a predetermined angle, so that the state where the continuous pattern is abutted on one side of the winding pattern formed at the first reciprocation at one end of the mandrel. Maintained from one end to the other and a continuous tape of fibers is uniformly wrapped around the mandrel.

Further, according to the present invention, the tape-shaped continuous fibers can be arranged at the target position on the circumferential cross section of the mandrel even when they are abutted with each other by two or more reciprocations, so that the conventional inconvenience does not occur.

〔Example〕

The present invention will be described below with reference to FIGS.

In FIG. 3, 4 is a mandrel, 7 is a hemispherical cone portion having a straight cylindrical portion 8 on the small diameter side, and 9 is an eye 6 of a carriage traverse 5 to which the continuous fiber 2 wound around the mandrel 4 is fed. The relative position 2 with respect to the mandrel 4 shows the continuous fiber wound around the mandrel 4, respectively. A to F indicate the angular positions of the carriage traverse 5 in the following states.

A, F: When the continuous fiber 2 reaches the right cylindrical portion 8, B, E: When the right cylinder portion C, D: When the continuous fiber 2 reaches the end point of the mandrel A point, F point, that is, the mandrel 4 When the continuous fiber 2 to be wound reaches the right cylindrical portion 8, the carriage traverse 5
Since the moving direction of No. 1 changes to the opposite direction, the carriage traverse 5 is temporarily stopped and the rotation of the mandrel 4 is also temporarily stopped. At this time, namely, the carriage traverse 5 and the mandrel 4 are stopped at points A and F at which the mandrel 4 is swung to move both the points A and F so that the winding position of the tape-shaped continuous fiber 2 is changed. Shift by the tape width in the axial direction of. Assuming that the radius θ of the mandrel 4 is r ₀ , the winding angle is α, and the tape width of the tape-shaped continuous fiber 2 is W, the total turning amount θ of the mandrel 4 at the points A and F is It is represented by. After that, the points A and F shells of the carriage traverse 5 and the mandrel 4 are gradually accelerated, and between the mandrels 4, 1vc / v _M 1 = tan α (vc: moving speed of the carriage traverse, v _M : mandrel Peripheral speed), that is, the moving speed of the carriage traverse 5 and the mandrel 4
The tape-shaped continuous fiber 2 is wound around the peripheral surface of the mandrel 4 while maintaining the winding angle α of the tape-shaped continuous fiber 2 at a predetermined angle while keeping the peripheral speed ratio constant.

By doing so, the winding angle α is uniquely determined by vc / v _M , and the tape width W is secured by the turning of the mandrel 4, so that the tape width W is It is possible to wind while holding the. D is the mandrel diameter.

Next, FIG. 4 shows an example of a winding pattern in the case of forming carbon fiber reinforced plastics by the FW method of the present invention.

4A to 4F show respective positions of the carriage traverse 5 shown in FIG. According to the FW method of the present invention, when the carriage traverse 5 at points A * and F * is temporarily stopped, the mandrel 4 is added in total. In the winding pattern shown in FIG. 5, the mandrel 4 is swung at the point A. , 0 at point F and n times from point A ₀ The winding is performed so that a layer having a winding angle α is formed.

An example of the winding pattern of the present invention when abutting in two or more reciprocations is shown. In the helical pattern in which n reciprocations are abutted, the number of times required for the tape width to cover the mandrel circumference length is a multiple of n. Adjust the tape width so that
When the tape is wound up to the number of turns, the tape is placed in a phase that divides the circumferential length into n equal parts, and at the (n + 1) th time, the tape is shifted by n equal parts plus the tape width, and the tape is wound so that it matches each first reciprocation. By sequentially shifting the circumference length up to 2n times or by dividing the circumference length by n, the fibers can be wound together next to the n-th adjacent fiber.

As a result, if the length of the circumference is divided into n equal parts and the length is covered with the tape width, the whole can be covered and the conventional problems can be avoided.

〔effect〕

According to the present invention, as described above, since the winding angle of the tape-shaped continuous fiber wound around the mandrel becomes constant and the tape width can be maintained constant, the tape-shaped continuous fiber butt Is extremely good, and it is possible to perform highly accurate winding without twisting or uneven thickness.

[Brief description of drawings]

FIG. 1 is a schematic view showing a filament winding method, FIG. 2 is a schematic view of a tape-shaped continuous fiber wound around a mandrel, and FIG. 3 is a schematic view showing a winding operation in the present invention. FIG. 5 is an explanatory view showing an example of a winding pattern in the present invention, and FIG. 5 is an explanatory view showing a winding state by a conventional method. 2 ... Continuous fiber, 4 ... Mandrel, 5 ... Carriage traverse, 7 ... Cone part, 8 ... Straight cylinder part.

Claims (3)

[Claims] 1. A large number of wound fibers impregnated with a resin,
When winding on the mandrel while aligning it in a tape shape by the carriage traverse that reciprocates in the axial direction with respect to the rotating mandrel, at both ends of the mandrel,
Connect the hemispherical cone part that has a straight cylindrical part on the small diameter side,
In the filament winding method in which the tape-shaped winding fiber is hooked on the straight cylindrical portion of the cone portion to reciprocate the tape-shaped winding fiber in the axial direction of the mandrel, a tape-shaped continuous portion is formed on the straight cylindrical portion of the cone portion. When reversing the moving direction of the tape-shaped continuous fiber by hooking the fiber, the mandrel is rotated, and the winding start part of the end of the mandrel is displaced in the axial direction of the mandrel by the tape width of the tape-shaped continuous fiber. The filament winding is characterized in that the winding speed of the carriage traverse and the peripheral speed ratio of the mandrel are kept constant when the continuous fiber of FIG. Law. 2. The amount of displacement of the tape-shaped continuous fibers in the axial direction of the mandrel is evenly distributed in the straight cylindrical portions at both ends of the mandrel.
Filament winding method according to item. 3. The tape width is adjusted so that the number of times required for the tape width to cover the length in the circumferential direction of the mandrel is a multiple of n in the helical pattern of n reciprocating butting, and n
At the time of winding up to a number of times, the tapes are arranged in a phase in which the circumferential length is divided into n equal parts, and in (n + 1) times, the position is shifted by n equal parts plus the tape width and wound. The filament winding method according to claim 1.