DE102014200736B4 - Apparatus and method for producing a wound fiber composite component - Google Patents

Abstract

Device for producing a wound fiber composite component with a winding core (12) which is arranged rotatably about a rotation axis (A) and a plurality of fiber deposition units (14) arranged at radial distance (r) from the winding core (12) and parallel to the rotation axis (A) are arranged individually displaceable and from which at the same time endless fibers (18) to the winding core (12) can be performed, characterized in that a control is provided which is adapted to individually control the individual Faserablegeeinheiten (14) so that several layers simultaneously be wound and cross over the fibers of the individual layers at a plurality of connection points and intertwine, the position angles (α, β) are individually controlled.

Description

The invention relates to a device and a method for producing a wound fiber composite component according to the preamble of claim 1 or of claim 6.

Winding processes are well suited for the production of comparatively lightweight and yet stable hollow bodies. In this case, wound on a winding core, which determines the inner shape of the later hollow body, continuous fibers, which are impregnated with a resin. The fibers can be deposited on the surface of the winding core in the form of rovings, ie in the form of substantially parallel fiber bundles.

In such a winding method, the winding core is rotated about a rotation axis, while a Faserablegeeinheit is moved parallel to the axis of rotation of the winding core back and forth, so that the course of the fiber on the winding core results from the interaction of the rotational movement of the winding core and the linear movement of the Faserablegeeinheit. The winding pattern thus generated is determined by the so-called position angle between the course of the fiber on the winding core and the axis of rotation. The offset of the fiber track along the axis of rotation results in uniform layers of adjacent fibers.

Even if two intersection points of the fibers per wrapping result at smaller ply angles, essentially layers of fibers or fiber bundles running in parallel are formed. This has the disadvantage that essentially only the adhesive forces of the resin matrix act between superimposed fiber layers, but only slight mechanical interweavings of the individual layers exist with one another.

In the generic US Pat. No. 7,407,556 B2 a winding device is shown in which a plurality of Faserablegeeinheiten are provided which are individually displaceable along an axis of rotation of the winding core, but synchronously moved

The DE 10 2010 015 027 A1 , the EP 2 532 507 A2 , the DE 10 2008 014 380 A1 and the DE 27 36 125 show further winding devices.

In the WO 2010/091732 A1 It is described to cover a support core by means of a round braiding machine with a braid, which is then solidified with a binder to form a hollow body. To reinforce the braid, the round braiding machine is moved back and forth in sections of the support body.

The object of the invention is to increase the stability of a wound fiber composite component in a simple manner.

This is inventively achieved with a device for producing a wound fiber composite component having the features of claim 1. In this way, several layers are simultaneously applied independently of each other on the winding core, which inevitably cross over the fibers of the individual layers and thus intertwined. This results in a large number of connection points between the individual layers, which lead to the reinforcement of the entire fiber composite.

Another advantage is that the process time is shortened because several layers are wound simultaneously.

The distribution of the fibers on several Faserablegeeinheiten also has the advantage that fewer bobbin changes are required, since the total length of fiber used per Faserablegeeinheit reduced and the total fiber length can be distributed over several coils.

The device according to the invention can be integrated, for example, in a known computer-controlled CNC winding machine. This preferably also has the possibility of detecting the shape of the winding core, either itself by a laser scanning process or by the input of appropriate data. It is advantageous if the winding machine controls the rotational movement of the winding core and the linear movement of the Faserablegeeinheiten both parallel to the axis of rotation and preferably also in the radial direction accordingly to achieve an optimal winding process. The displacement of the individual Faserablegeeinheiten along the axis of rotation and / or the current position angle are individually controlled, the control can be done by the control of the winding machine. In this way individually adapted to the respective winding core winding patterns can be generated, which optimizes the production of the wound fiber composite component in a simple manner.

Each of the fiber delivery units is preferably associated with a separate fiber biasing device for maintaining a constant fiber tension.

The respective fiber biasing device may be rigidly connected to the associated Faserablegeeinheit so that they can be moved as a unit.

The winding core is for example a base hollow body of a fuel tank, which may also be designed as a pressure tank. The hollow body determines the inner volume of the fuel tank and also ensures the tank is sealed to the outside. The wound fibers of the fiber composite component form the majority of the outer wall of the fuel tank and significantly determine its strength and pressure stability.

Suitable fibers are all known and suitable for winding processes suitable fibers, either as a single continuous fiber in the form of rovings or in other suitable compositions. As is known, the fibers are also provided with a resin in a suitable process, so that the finished fiber composite component has a resin matrix with fibers embedded therein.

In a method according to the invention for producing a fiber composite component having the features of claim 5, which can be carried out in particular with a device as described above, endless fibers of a plurality of fiber deposition units arranged radially outside the winding core and displaceable parallel to the axis of rotation of the winding core are deposited simultaneously on a rotating winding core

The continuous fibers are thereby deposited on the winding core by at least two fiber depositing units at different layer angles. At the same time, layers with different layer angles are formed, but because of the fiber intersections, they are intertwined at several points per layer both along the circumference and along the axis of rotation of the winding core.

The winding core preferably rotates at a constant angular velocity. However, it is also possible to vary the angular velocity of the winding core, for example as a function of its geometry or of the winding pattern to be produced. The winding speed of the winding core can be controlled by the control of the winding machine as well as the movement of the Faserablegeeinheiten.

Preferably, the Faserablegeeinheiten and the winding core in their movement are coordinated so that each continuous fiber is deposited on a geodetic winding track on the winding core to prevent slippage of the fibers on the winding core or the already wound fiber composite component. This tuning is preferably taken over by the control unit of the winding machine.

The invention will be described in more detail below with reference to an embodiment with reference to the accompanying drawings. In the drawings show:

1 a schematic representation of a winding device according to the invention for carrying out a winding method according to the invention in a side view; and

2 the device off 1 in a schematic front view.

1 shows a device 10 for producing a wound fiber composite component (not shown in more detail).

A winding core 12 , which determines the later contour of the fiber composite component and which is formed for example as a hollow body, is rotatably mounted about a rotation axis A. The device 10 is part of a winding machine, not shown, whose control, inter alia, the angular velocity of the winding core 12 certainly. The angular velocity can be kept constant or varied as needed.

Radially outside of the winding core 12 are several fiber delivery units 14 arranged ( 2 schematically shows six Faserablegeeinheiten 14 However, any number can be used, depending on the size of the hub 12 ).

Each of the fiber delivery units 14 here is rigid with a separate fiber biasing device 16 connected to the tension of an endless fiber 18 on the hub 12 is stored under the specification of the controller keeps constant. The endless fiber 18 Here, each of the fiber delivery units becomes 14 from a separate coil 20 fed.

The endless fibers 18 be in known manner before application to the hub 12 impregnated with a suitable resin, wherein the resin supply takes place in a known way and is not shown here.

The fiber delivery units 14 are arranged so that they can be moved parallel to the axis of rotation A back and forth, while the endless fiber 18 lay down. It is possible the device 10 form so that the Faserablegeeinheiten 14 can also be moved in the radial direction r.

2 shows the device 10 seen from an end face, in the example shown, the Faserablegeeinheiten 14 all are arranged at the same radius.

In the example shown, each of the Faserablegeeinheiten 14 the endless fiber 18 with a different position angle α, β to the winding core 12 , The ply angle α, β is defined as the angle between the continuous fiber 18 on the winding core 12 and a parallel of the axis of rotation A ', on the surface of the winding core 12 lies. In this way, at the same time several layers with different layer angles α, β, but at several points along the circumference and along the longitudinal extent of the winding core 12 intertwined, since inevitably the continuous fibers 18 both layers due to the rotation of the hub 12 cross. In this way, almost any winding pattern can be produced with multiple, simultaneously arising layers.

For example, two layers with layer angles of 15 ° and 90 ° can be wound simultaneously. In this case, the substantially spirally wound along the axis of rotation A layer with the layer angle of 90 ° at a very shallow angle thereto extending reinforcements obtained by the wound with the layer angle of 15 ° layer. This results in a very good interweaving and a high stability of the finished fiber composite component.

It is possible that each of the Faserablegeeinheiten 14 used a different layer angle, but it can also be some or all Faserablegeeinheiten 14 use the same position angle α, β.

The control of the device 10 ensures that the movement of Faserablegeeinheiten 14 along the axis of rotation A in combination with the rotation of the winding core 12 if possible always done so that the continuous fiber 18 along a geodesic on the hub 12 is filed.

Claims (7)

Device for producing a wound fiber composite component with a winding core ( 12 ), which is arranged rotatably about a rotation axis (A), and a plurality of fiber deposition units ( 14 ), which with radial distance (r) to the winding core ( 12 ) and parallel to the axis of rotation (A) are arranged individually displaceable and of which at the same time continuous fibers ( 18 ) to the winding core ( 12 ), characterized in that a control is provided which is adapted to the individual Faserablegeeinheiten ( 14 ) individually so that several layers are wound simultaneously and the fibers of the individual layers cross at a plurality of connection points and intertwine, wherein the layer angles (α, β) are individually controllable. Device according to claim 1, characterized in that each of the fiber depositing units ( 14 ) a separate fiber pretensioning device ( 16 ) is assigned to maintain a constant fiber tension. Device according to claim 2, characterized in that the respective fiber pretensioning device ( 16 ) rigidly with the associated Faserablegeeinheit ( 14 ) connected is. Device according to one of the preceding claims, characterized in that the winding core ( 12 ) is a hollow body of a fuel tank. Method for producing a fiber composite component, in particular by means of a device according to one of the preceding claims, characterized in that on a rotating winding core ( 12 ) Endless fibers ( 18 ) of several radially outside of the winding core ( 12 ), parallel to the axis of rotation (A) of the winding core ( 12 ) individually displaceable fiber depositing units ( 14 ) are deposited simultaneously, characterized in that a plurality of layers are wound simultaneously and the fibers of the individual layers cross over and intertwine at a multiplicity of connection points, the continuous fibers ( 18 ) of at least two fiber delivery units ( 14 ) under different position angles (α, β) on the winding core ( 12 ) are stored. Method according to claim 5, characterized in that the winding core ( 12 ) with variable angular velocity. Method according to one of claims 5 and 6, characterized in that the Faserablegeeinheiten ( 14 ) and the winding core ( 12 ) are coordinated in their movement so that each continuous fiber ( 18 ) on a geodesic winding track on the winding core ( 12 ) is stored.

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