JPH0749351B2 - Method for making a fiber composite laminate composed of fiber composite material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a fibrous composition laminate according to the preamble of claim 1.

By a continuous winding and forming method in which a fiber composition outer skin, for example, a fiber composition-sandwich structure is reciprocally moved relative to a rotating core of a thread eye, the reinforcing yarns have an equal number of degrees or It is known that a thread eye is moved forward and backward at different frequencies by one at most and placed on the core. The fiber composition coat thus formed is composed of two yarn structures that are braided so as to intersect with each other, and the intersecting angle of these yarn structures is about twice the lead angle of the reinforcing yarn selected in the winding process. big,
In addition, they have the same strength of fiber reinforcement in the direction of both yarn structures, that is, they have the same strength behavior and rigidity behavior.

On the other hand, when forming into a fiber composition structure composed of a large number of yarn structures that intersect each other through the yarn knotting position and have different yarn densities and are accompanied by a principal stress direction or a deformation direction, it is adapted to the load. And the weight required to reach a favorable fiber distribution, the fiber composition must be made with a warp-reinforced fiber composition-significantly higher mechanical and cost than fabrics, e.g. by a composition method. . In addition to this, such fabrics can only be used at low areal weight stages and with low warp-weft ratios, above all not just the reticulation required for high-grade metering constructions. However, the fact is added that special fiber types at risk of breakage, in particular supermodular carbon fibers, cannot be processed into such fibers.

The object of the invention, on the other hand, is to achieve in a simple and cost-effective manner an individually and steplessly selectable yarn density in each of the fibrous structures which are mutually composed at constant crossing angles of the laminate. And, indeed, virtually any type of fiber, in particular the carbon fibers mentioned above, can be processed without any problem.

This problem is solved according to the invention by a method having the features of patent claim 1.

The present invention provides a continuous and fiber-free wound forming method by intentionally pre-adjusting the lead angles for the forward and backward movements, taking into account the crossing angle and the yarn density ratio. The resulting compositional material-rolled skin is obtained with little mechanical outlay and expense, the fibrous composition laminate having higher fibers on one side in a yarn system braided together under a given crossing angle. Satisfies requirements for reinforcement in an optimal weight condition. Since the thread eye usually has to make many forward and backward movements until the desired thread density is reached, even the thread eye generally makes forward movements more frequently or less frequently than backward movements. Even so, the ratio of the forward movement and the backward movement is a difference based on one.

In this case, in a particularly advantageous construction of the invention, the lead angles for the forward movement and the backward movement are determined very simply by the method according to claim 1 and the peripheral speed of the winding core is determined. And the ratio of the feed rate to the rotation speed is determined by the configuration described in claim 3.

The wound laminate is in particular cut by the method according to claim 4 whereby a common twisting orientation change of the fiber structure is achieved. That is, for example, a fibrous structure having a high degree of fiber reinforcement involvement is oriented in the principal stress direction of the wound skin. It is easily possible to impregnate the thread structure of the wound laminate or wound envelope with the resin matrix of the fiber composition material only after the completion of the winding and molding process, but in terms of the above method technical simplification. Advantageously, the reinforcing yarn is impregnated with the resin before passing through the thread eye by the method according to claim 5. The particular advantages of the method in terms of its extremely lightweight construction are described in claim 6
The method described in the item (1) above is used to form the outer shell of the wound body from carbon fibers of the super module. In order to configure the winding envelope to respond to very high stresses and to produce it with a correspondingly large areal weight, the winding laminate according to the method as claimed in claim 7 is particularly repeated. Winding is performed according to the forming template. As a result, the reinforcing yarns in the laminated body are arranged not only in a dense order but also in a vertically overlapping manner.

Hereinafter, the present invention will be described in detail with reference to the embodiments illustrated in the accompanying drawings.

According to FIG. 1, in order to make a fiber composition material-rolled body laminate composed of two fibrous structures 2, 4 braided to each other at an intersecting angle β, endless reinforcing yarns are alternately and sequentially performed many times. Rotation with end caps (Polkappe) 8 and 10 for reversing the advancing direction of the reinforcing yarn at the end side at a lead angle α corresponding to half the value of the crossing angle β continuously in forward and backward movements It is wound onto a cylindrical winding core 6 until the desired areal weight is reached, after which the winding laminate is brought to the intersection line given beforehand by the fiber orientation in the winding envelope 12 (Fig. 1b). It is cut along with and taken out from the core 6. In the outer cover 12 thus formed, the area weight of the reinforcing yarn is divided into the fiber structures 2 and 4 at the same ratio. That is, both fiber structures 2 and 4 have the same fiber density. In the case of this embodiment, the crossing angle β is 90 °, that is, the lead angle α in the forward and backward movements is 45 °.
And the intersecting lines A-A, B-B are selected so that the fibrous tissue 2,4 in the roll skin 12 has a 90 ° / 0 ° orientation.

The winding and forming method according to the present invention will be described with reference to the winding apparatus shown in FIG. This winding device comprises a cylindrical core 6 having end caps 8 and 10 which continuously rotates at a rotation speed n, and a sled which moves forward and backward in parallel with the core 6. It is constructed in a general manner from an eye 14 and an impregnation vessel 16 connected in front of this thread eye and equipped with an impregnation roller 18. Bobbin
Reinforcing yarns 22 drawn from 20, for example super-modular carbon yarns, are guided along impregnating rollers and impregnated with a resin matrix of fibrous composition material, before being placed on the core 6 with uniform tension. .

The thread eyes 14 are alternately moved forward and backward a number of times to move forward and backward a number of times. The fibers are wound until the area weight is reached. At the same time, however, this areal weight is also distributed differently on both fibrous tissues 2, 4 in a predetermined manner. That is, the yarn density individually determined is given to each of the fiber structures 2 and 4.
For this purpose, the lead angle .alpha.r for the fiber texture 2 wound in the forward movement is the lead angle for the fiber texture 4 wound in the backward movement which complements this lead angle .alpha.r for the crossing angle .beta .. α _R is the formula (In this case, X = required yarn density ratio of the fiber structure 2 wound and formed in the forward movement to the fiber structure 4 wound and formed in the backward movement, m = the frequency of the forward movement of the thread eye 14, and n = The frequency of the backward movement of the thread eye 14.) Is determined.

Since m = n or | m−n | = 1 and m, n> 0, Holds, (In this case, Vr.V _R = feed speed of the thread eye 14 at the forward movement or backward movement, U and nr. Peripheral speed and forward movement frequency or retracting movement power of _R = winding core 6.) Holds.

Other simplified expressions for intersection angle β = 90 ° And Holds.

As shown in the figure, the fiber reinforcement 2 is involved in the fiber reinforcement 4
If the fiber reinforcement is about twice as large, β = 90
In order to set X = 2 in °, αr is adjusted to 26.565 ° and α _R (= β-αr) is adjusted to 63.435 °, and when the rotational speed of the cylindrical core 6 is constant, the backward movement is performed. The feed rate of each thread eye 14 must be selected to be four times the feed rate in forward movement.

The wound laminate (FIG. 3a) thus wound and formed to the desired area weight of the fiber-reinforced portion is then cut into the wound outer shell 12 corresponding to the desired fiber orientation, and in this case, the third In the case of the intersecting lines A-A and BB in the winding shell 12 according to the figure, a fiber orientation of 45 ° is obtained for both fibrous structures 2 and 4 (see FIG. 3b), while the yarn direction of the fibrous structures 2 and 4 is obtained. When the intersecting lines run parallel to or perpendicular to, the winding shell 12 shown in FIG. 3c is formed.
Has a 90 ° orientation with a slight yarn density, and the fiber structure 2 has a 0 ° orientation due to the fiber reinforcement which is about twice as high.

[Brief description of drawings]

FIGS. 1a and 1b are views of a roll laminated body formed by roll forming by a known technique and a roll outer cover cut from the roll laminated body, and FIG. 2 is for explaining a roll forming method according to the present invention. Figure 3a is a highly schematic view of the winding device of Figure 3, Figure 3a is a view of a roll laminate produced by the method according to the invention, and Figure 3b is a view of the roll laminate of Figure 3a with different yarn orientations. FIG. 3 is a diagram of two fiber composition laminates that have been cut differently. The reference numerals in the figure are 2,4 ...... Fiber structure 6 ...... Core 8, 10 ...... End cap 12 ...... Winding shell 14 ...... Thread eye 20 ...... Winding body

Claims (7)

[Claims] 1. A thread having a peripheral speed of a winding core, wherein at least one endless yarn is continuously and alternately moved forward and backward a plurality of thread eyes, and independently rotated with respect to the thread eyes. The winding is performed at a lead angle determined by the ratio of the eye to the feeding speed, and the winding laminated body thus formed is taken out from the winding core in an unhardened state, and is oriented in a first direction. A first fibrous structure composed of reinforcing threads, and at least one second fibrous structure braided in a cross orientation with the first fibrous structure composed of reinforcing threads oriented in a second direction of the other direction; In a method for producing a laminate of pre-impregnated fibrous composite material from at least one fibrous layer of, the lead angle with respect to the forward movement is the crossing angle of both fibrous structures and the preselected yarn density ratio. By adjusting the lead angle with respect to the forward movement and the backward movement, respectively, so that the lead angle with respect to the backward movement is different from the lead angle with the forward movement by the crossing angle of the fiber tissue. A method for producing a fiber composition laminate, characterized in that the textures are wound with variable selectable thread densities independent of each other. 2. When the thread eye is moved forward and backward at the same and / or higher powers, the lead angle for the forward and backward movements is given by the following formula: (In this case, αr = lead angle for the fiber structure wound in the forward movement, α _R = lead angle for the fiber structure wound in the backward movement, β = crossing angle of both fiber structures, 2. The fiber composition laminate according to claim 1, wherein X 1 = the yarn density ratio of the fiber structure wound in the forward movement to the fiber structure wound in the backward movement) is satisfied. How to build a body. 3. When the thread eye is moved forward and backward at the same and / or higher degrees, the ratio of the feed speed to the peripheral speed in the forward movement is expressed by the following equation: In this case, Vr. _R = feeding speed of the fiber tissue in forward and backward movements, Ur. _R = peripheral speed of the winding core in forward and backward movements, β = crossing angle of both fiber tissues, X = winding in forward movement A fiber composition laminate according to claim 1 or 2, which is selected so as to satisfy a yarn density ratio to a fiber structure to be wound in the backward movement of the fiber structure to be formed. Way for. 4. The winding laminate is cut along a line of intersection corresponding to the fiber orientation in the outer cover of the winding body.
A method for producing the fiber composition laminate according to any one of items 1 to 10. 5. A method for making a fiber composition laminate according to any one of claims 1 to 4, wherein the reinforcing yarn is impregnated with resin before it passes through the thread eyes. . 6. A method for producing a fiber composition laminate according to any one of claims 1 to 5, wherein a super-module carbon yarn is wound and formed as a reinforcing yarn. 7. The winding laminate according to any one of claims 1 to 6, wherein the winding laminate is wound and formed according to a winding pattern repeated in multiple layers in order to obtain a larger areal weight of the winding outer cover. A method for making a fibrous composition laminate according to one.