JPS6212581A - Manufacture of fiber composition material-wound body skin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

Continuous winding of the fiber composition shell, e.g. the fiber composition sandwich structure, by reciprocating the thread eye relative to the rotating core, is carried out using reinforcing threads of equal or greater frequency or It is known to make a thread eye resting on the winding core with forward and forward movements of up to one different degree. The fiber composition skin thus formed consists of two intersectingly braided thread structures, the crossing angle of these thread structures being twice the lead angle of the reinforcing threads selected in the winding process. The fiber reinforcement is large and has the same strength of fiber reinforcement in both thread weave directions, ie the same strength and stiffness behavior.

On the other hand, when forming a fiber composition structure with a principal stress direction or a deformation direction, the structure is composed of a large number of yarn structures that intersect with each other through the yarn knotting position and have different yarn densities, and has a principal stress direction or a deformation direction. And the fiber composition required to achieve a favorable fiber distribution by weight has to be produced, for example by weaving methods, with significantly higher mechanical and cost outlays than with warp-reinforced fiber compositions - woven fabrics. . In this case, in addition to this, such fabrics can be used only at low areal weight levels and with low warp-weft softening ratios, which is particularly necessary for highly lightweight construction styles. However, there is the added fact that certain fiber types with a risk of breakage cannot be processed into such fibers, namely particularly ultra-modular carbon fibers.

In contrast, the object of the present invention is to provide a thread density that can be individually and steplessly selected in each of the fiber structures interwoven with each other at a constant angle of intersection of the laminate in a simple and cost-effective manner. The object of the present invention is to create a method for producing fiber composition laminates which can be achieved and which in fact can process any arbitrary type of fiber without problems, in particular even the carbon fibers mentioned above.

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

According to the invention, continuous and non-damaging winding by presetting the forward movement and the lead angle for the forward movement intentionally differently, taking into account the crossing angle and thread density, is a forming method. With little mechanical outlay and expense, a fibrous material-wound shell is obtained, which fibrous material-wound skin is formed on one side in a yarn structure that is interwoven with one another under a predetermined crossing angle. satisfies the demands for higher fiber reinforcement involvement in weight-optimized conditions. Even if the thread eye generally performs forward motions more frequently or less frequently than forward motions, it is often necessary to carry out forward and backward motions of the thread eye many times until the desired thread density is achieved. Even so, the forward motion and the ratio of forward motion are the differences based on - □.

In this case, in a particularly advantageous embodiment of the present invention, the forward movement and the lead angle for the forward movement are determined very simply by the method set forth in claim 2, and the circumferential speed and rotation of the winding core are The ratio of the feed rate to the number is determined by the arrangement according to claim 3.

The rolled laminate is cut in particular by the method according to claim 4, whereby a reorientation of the fiber structure with a common twist pattern is achieved.

That is, for example, a fiber structure with a high fiber reinforcement degree is oriented in the principal stress direction of the winding shell. It is easily possible to impregnate the thread structure of the rolled laminate or the rolled shell with a resin matrix of the fiber composition material only after the winding process has ended, but there are still further technical simplifications. In this case, it is advantageous to impregnate the reinforcing thread with resin before passing through the thread eye by the method according to claim 5. A particular advantage of the method in terms of its extremely lightweight construction is that the winding shell is produced from a supermodular carbon system by the method described in claim 6. In order to make the winding sheath extremely high and stress-responsive and with a correspondingly high areal weight, the winding stack can be produced in particular by repeated multilayer windings by the method according to claim 7. Wrapping and forming are performed according to the forming model. As a result, the reinforcing threads in the laminate are not only arranged in a dense order but also arranged one above the other.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in detail with reference to embodiments illustrated in the accompanying drawings.

According to FIG. 1, in order to create a laminate of fiber composition material consisting of two fiber structures 2, 4 interwoven with each other at a crossing angle β, endless reinforcing threads are carried out a number of times one after the other in alternation. An end cap (Po1ka-pp
e) onto a rotating cylindrical winding core 6 with 8, 10 until the desired areal weight is reached, the wound laminate is then wound with fibers in the outer winding r3i12 (FIG. 1b). It is cut along the intersection line given in advance by the orientation, and the weight is increased from the winding core 6. In the winding outer skin 12 formed in this manner, the area weight of the reinforcing yarn is divided into fiber structures 2 and 4 at the same ratio. That is, both fiber tissues 2,
4 have the same fiber density.

For this implementation, the crossing angle β is 90°, i.e.
The lead angle α in the forward movement and forward movement is 45°, and the intersecting lines AA, B-B are selected such that the fiber structures 2, 4 in the winding shell 12 have an orientation of 90° 10°. Ru.

The winding and forming method according to the present invention will be explained based on the winding apparatus shown in FIG. This winding 1. The device comprises a cylindrical winding core 6 which rotates continuously at a rotational speed n and is provided with end caps 8, 10, a thread eye 14 which moves forward and forward in axis parallel to this winding core 6, and The impregnated row 218 is connected in front of this thread eye.
The impregnating tank 16 is constructed in a conventional manner. The reinforcing yarn 22, e.g. supermodular carbon-based, drawn out from the yarn roller 20 is guided by impregnation rollers and coated with a resin matrix of fibrous composition material before being placed on the winding core 6 under uniform tension. Impregnated.

As the thread eyes 14 alternately move forward and backward a number of times, a predetermined winding layered body is formed on the winding core 6 from the two fiber structures 2 and 4 that are interwoven with each other at an intersecting angle β. Winding is carried out until a fiber-area weight of is reached. At the same time, however, this areal weight is distributed differently on the two fiber structures 2, 4 even in a given manner.

That is, each of the fiber structures 2 and 4 is given an individually determined thread density. For this purpose, in a forward movement the winding is formed with a lead angle αV and a crossing angle β for the fiber structure 2.
This lead angle ay f for the fibrous tissue 4 whose winding is formed with a complementary forward movement is given by the formula (in this case, The winding is determined so as to satisfy the required thread density ratio for the fiber structure 4 to be formed, where m=the number of degrees of forward motion of the thread eye 14, and n=the number of degrees of forward motion of the thread eye 14.

m = n or l m -n l = 1 and m, n)
Since tanα=-, “V”Rx+coaβ (in this case, TV, R=forward movement or feed rate of thread eye 14 in forward movement, ■ and nV, R=speed of winding core 6 Circumferential velocity and forward motion degree or forward motion degree.) holds true.

Regarding the intersection angle β = 900, another simplified formula % formula % As shown in the figure, the involvement of fiber reinforcement in fiber tissue 2 is
When increasing the fiber reinforcement participation by twice as much, i.e. β = 9
If we want x = 2 K I at 0°, then αV to 24565° and α, (=β − αy) f4:61
455° and the rotational speed of the cylindrical winding core 6 is constant, the feed rate of the thread eye 14 in the forward movement must be selected to be four times as great as the feed rate in the forward movement.

The rolled laminate (FIG. 3a) which has been wound and formed in this way up to the desired areal weight K of the fiber reinforcement is then cut into rolled skins 12 corresponding to the desired fiber orientation, in which case Intersection MA-A and B-B inside FJL12 outside the roll according to Figure 3
A fiber orientation of ±45° is obtained for both fiber structures 2, 4 (see FIG. 3b), whereas if the line of intersection runs parallel or perpendicular to the thread direction of the fiber structures 2.4, The winding outer skin 12 shown in Fig. 30 is formed, and in this winding outer F112, the fiber structure 4 has a 90° orientation with a slight thread density, and a 0° orientation with a fiber reinforcement participation that is twice as high as the fiber structure. It has an orientation of

FIG. 2 is a highly schematic diagram of the winding device for explaining the winding and forming method according to the invention; FIG. FIG. 3a is an illustration of two fiber composition material-roll skins cut differently from the roll stack of roll a made by the method according to the invention.

The symbols in the figure are 2.4...Fiber tissue 6...-°・core 8.10・-・End cap 12...roll outer skin 14...-Fist Thread Eye 20... Thread roller

Claims (1)

[Claims] 1. At least one endless yarn is continuously moved forward and backward many times by alternating the threaded eyes, so that the threaded yarn is wound on a winding core that rotates relative to the threaded eyes. Unidirectional winding is carried out by winding at a lead angle determined by the ratio of the circumferential speed of the core to the feed speed of the threaded eye, and by taking out the wound laminate thus formed from the core in an uncured state. a first fiber structure consisting of reinforcing yarns oriented in one direction and a first fiber structure consisting of reinforcing yarns unidirectional and oriented in a second direction in a cross-orientation; A method for making a winding shell - a fiber composition material pre-impregnated from at least one yarn layer consisting of at least one second fibrous structure, in which both fibrous structures are combined into a reed of one or more endless threads. The lead angle changes with each change of direction of the thread eye, and this lead angle is determined for the forward movement depending on the crossing angle of both fiber structures and the desired thread density, and for the backward movement corresponds to the crossing angle in contrast to the above determination. A method for producing the above-mentioned fibrous composition material-wound skin, characterized in that the fiber composition is wound and formed with different thread densities so as to be adjusted to different values. 2. When moving the threaded eye forward and backward with the same degree and/or with more degrees, the lead angle for this forward and backward movement is determined by the following formula: tanα_V=sinβ/(x+cosβ) and tanα
_R=tan(β-α_V)=sinβ/[(1/x)
+ cos β] (in this case, α_V = lead angle for the fibrous structure that is wrapped and formed in the forward movement, α_R = lead angle for the fibrous structure that is wrapped and formed in the backward movement, β = intersection angle of both fibrous structures) The fiber composition according to claim 1, which is selected so that the following is satisfied: Materials - Method for constructing the roll shell. 3. When the threaded eye is moved forward and backward at the same degree and/or greater degree, the ratio of the circumferential speed to the feed rate in the forward movement to the feed rate to the circumferential speed in the backward movement is expressed by the following formula: V_V/U_V: V_R/U_R=[(1/x)+co
sβ]/(x+cosβ) (in this case, V_V_, _R = feed rate of the fiber tissue in forward motion and backward motion, U_V_,_R = circumferential speed of the winding core in forward motion and backward motion, β = crossing angle of both fiber structures , x=thread density ratio of the fiber tissue wrapped and formed in the forward motion to the fiber tissue wrapped and formed in the backward motion). Fiber Composition Material - Method for Making a Roll Shell. 4. The fiber composition material according to any one of claims 1 to 3, in which the rolled laminate is cut along a cross line corresponding to the fiber orientation in the rolled outer skin - the rolled outer skin A method for building. 5. A method for making a fibrous composition-wound shell according to any one of claims 1 to 4, characterized in that the reinforcing thread is impregnated with a resin before it passes through the thread eye. 6. A method for making a fibrous composition material-wound shell according to any one of claims 1 to 5, which comprises winding and molding a super-modular carbon-based reinforcing thread. 7. Any one of claims 1 to 6, wherein the rolled laminate is wound and formed according to a winding pattern that is repeated in multiple layers in order to obtain a larger area weight of the rolled body skin. Fiber composition material according to - Method for making a roll skin.