FIBER LAYING PLANT FOR THE PRODUCTION OF A FIBER PREFORM AND METHOD FOR THIS

Description

[0001] The invention relates to a fiber laying system for producing a fiber preform from a quasi-endless fiber material of a fiber composite. The invention also relates to a method for this.

[0002] Due to the high strength-to-weight ratio and stiffness of fiber-reinforced composite components, these materials are now indispensable in the aerospace industry and many other fields, such as the automotive sector. Their exceptionally favorable strength-to-weight and stiffness ratio makes these fiber-reinforced composites particularly well-suited for lightweight construction.

[0003] In the production of a fiber-reinforced composite component, a matrix material embedding the fiber material is typically cured under temperature and pressure, forming an integral unit with the fiber material after curing. This forces the reinforcing fibers of the fiber material into their predetermined direction, enabling them to transfer the applied loads in that direction.

[0004] Fiber-reinforced composites, from which such fiber-reinforced composite components are manufactured, generally have two main components: a fiber material and a matrix material. Additional secondary components can also be used, such as binders or functional elements to be integrated into the component. If dry fiber materials are used for production, the matrix material of the fiber-reinforced composite is infused into the fiber material during the manufacturing process, so that the dry fiber material is saturated or impregnated with the matrix material. This usually occurs due to a pressure difference between the matrix material and the fiber material, for example, by evacuating the fiber material using a vacuum pump.In contrast, fiber composite materials are also known in which the fiber material is already pre-impregnated with the matrix material (so-called prepregs).

[0005] To ensure the fiber composite component achieves its desired geometry, the fiber material (dry or pre-impregnated fiber semi-finished product) is formed into the desired shape before the matrix material has fully cured. For this purpose, particularly with complex component geometries, so-called preforms are produced beforehand. These preforms either replicate the final component geometry or are very similar to it. Often, several preforms are assembled to form the complete component. Such a preform can then be placed, for example, in a manufacturing setup where it is injected with a matrix material, and subsequently, the matrix material is cured along with the component.

[0006] To prevent the fiber material from shifting during the production of the fiber preform, especially during automated laying or draping processes, the fiber material is fixed in place. This can be achieved, for example, by applying a binder material in the form of a powder or a nonwoven fabric, or by introducing heat energy. With so-called prepregs, adhesion can also be achieved without a binder material by applying heat, as the matrix material contained in the pre-impregnated fibers softens or melts and thus adheres to one another.

[0007] Especially with large components and components with a large layer structure, fixing is necessary to connect individual layers and to give the manufactured preform, also called preform, a certain degree of inherent stiffness.

[0008] Furthermore, it has been shown that warmed or heated prepregs have improved processing properties, so that warmed or heated prepregs can be better shaped into the desired component form.

[0009] From DE 102011 076 463 A1 a repair method for a molded part made of a plastic material is known, in which a passive heating element is provided in the repair area, which is subjected to an alternating magnetic field from the outside without contact.

[0010] From DE 103 53 070 A1, a method and a device for binder activation of fiber semi-finished products are known, in which two electrodes are provided in the mold tool and are in contact with the outer edge regions of the preform. When a voltage is applied to the electrodes, a current flows through the preform, leading to heating and thus binder activation. A disadvantage of this method, however, is that the entire preform is to be heated, which leads to high current flows, especially in preforms with a large number of layers. This is because, due to the arrangement of the electrodes in the mold tool, the current typically flows through the lower fiber semi-finished product layers, meaning that binder activation in higher fiber semi-finished product layers can only be achieved through high heat radiation from the lower layers and thus a high current flow.

[0011] From DE 10 2011 108 157 A1 a molding tool for the production of fiber composite components is known, in which a plurality of induction devices are provided in the molding tool in order to heat the fiber composite component introduced into the molding tool by means of induction.

[0012] A similar device is also known from DE 10 2006 040 049 A1, in which the fiber semi-finished product layers are arranged on the mold under a vacuum bag. A pressure difference presses the carbon fibers together, and an alternating magnetic field is used to generate electric currents in the carbon fibers for binder activation.

[0013] From DE 10 2008 020 564 A1 a tape laying device is known in which the pressure roller is designed in such a way that the laid fiber tapes can be supplied with heat energy by means of infrared radiation or induction.

[0014] From DE 10 2013 107 102 A1, a fiber preform tempering device for tempering a fiber preform formed from several layers of fiber preforms is known, which has a first and a second electrical contact element. The two contact elements are placed on opposite sides of the already manufactured fiber preform in order to effect a current flow in the thickness direction through the fiber preform.

[0015] From DE 10 2013 107 103 A1, a fiber laying head for placing fiber semi-finished products onto a forming tool is known, wherein the fiber laying head has an electrode that interacts with a counter electrode in such a way that when an electrical voltage is applied to the electrode and / or counter electrode, when the electrode and counter electrodes are in contact with the fiber material to be laid, a current flow is caused which serves to temper the fiber material to be laid.

[0016] From DE 10 2013 107 105 A1, a method for locally tempering a previously manufactured fiber preform consisting of several fiber layers is known. In this method, an electrode and a counter electrode are electrically contacted on the same outer side of the fiber preform and pressed towards the fiber preform with a certain contact force, so that when an electrical voltage is applied to the electrode and / or counter electrode, a current flow is caused in a deeper fiber layer of the fiber preform.

[0017] In fiber laying systems where the fiber material is contacted by an electrode in the form of a single deflection roller, temperature control via electrical current has proven disadvantageous due to the very high contact resistances between the electrode and the fiber material. These high contact resistances lead to lower energy efficiency in the process, as a large proportion of the power dissipated in the contact resistance is lost. Furthermore, at a given maximum electrical voltage for the system, high contact resistances reduce the maximum achievable process speed because the overall resistance is increased, resulting in less current being delivered to the fiber material even at the same voltage.

[0018] Furthermore, with thermoplastic carbon fiber semi-finished products, the surface of the semi-finished products is often largely coated with an insulating plastic layer. This can lead to situations where moving semi-finished products cannot be heated with direct electrical contact, or where, during movement of the semi-finished product over the contact electrode, the energy is only introduced into the semi-finished product in isolated, localized bursts in areas with low contact resistance. This creates extremely hot spots that can damage the semi-finished product.

[0019] It is therefore an object of the present invention to provide an improved device and an improved method in order to avoid the disadvantages known from the prior art in the temperature control of fiber semi-finished products by means of the introduction of current.

[0020] The problem is solved according to the invention by the fiber laying system according to claim 1 and the method according to claim 9. Advantageous embodiments of the invention are then found in the corresponding dependent claims.

[0021] According to claim 1, a fiber laying system for producing a fiber preform from a quasi-endless fiber material of a fiber composite is claimed, wherein the fiber composite contains the fiber material and a matrix material. Using the fiber laying system, the fiber material is laid onto a shaping tool surface in order to produce the fiber preform from the fiber material.

[0022] After the fiber preform is produced, the matrix material contained within the fiber preform is consolidated or cured to manufacture the fiber composite component. If dry fiber materials are used to produce the fiber preform, the matrix material is subsequently infused into the dry fiber material of the fiber preform in an infusion process and cured or consolidated. However, if a pre-impregnated fiber material is used to produce the fiber preform, a subsequent infusion process after the fiber preform is produced can be omitted, and the matrix material embedded in the pre-impregnated fiber material can be cured. According to the present invention, the fiber material to be deposited is an electrically conductive fiber material, such as a fiber material containing carbon fibers.

[0023] With thermoset prepregs, the component is cured. If thermoplastic prepregs are used, subsequent processing can be omitted with appropriate process control. The material is essentially cured as soon as it reaches a sufficiently low temperature and is heated above its melting point during deposition.

[0024] By design, the fiber laying system has at least one fiber laying head, which is configured to lay down the fiber material continuously fed to the fiber laying head in order to produce the fiber preform; a fiber feeding device, which is configured to continuously feed the quasi-endless fiber material from a fiber material supply device to the fiber laying head; and a temperature control device, which is configured to temperature-control the quasi-endless fiber material during the continuous feeding and laying process. The fiber material, which is continuously fed to and laid down by the fiber laying head, is temperature-controlled during the continuous feeding and laying process by means of the temperature control device, which creates an electric current flow in the continuously moving fiber material.This current flow leads to a heating of the fiber material due to its electrical resistance, which makes it easier to lay down, process and / or fix the fiber material.

[0025] The fiber feeding device has one or more deflection rollers for the reliable feeding of the fiber material. The fiber material is guided along these rollers in contact with the rollers, and may change direction during this process. At least one of the deflection rollers may be actively driven to provide the necessary feed force to the fiber material. Alternatively, a pair of opposing feed rollers or cylinders may be provided, between which the fiber material is clamped. The active drive of these feed rollers allows the fiber material to be set in motion again from a standstill.

[0026] According to the invention, the temperature control device has a clamping device with two opposing clamping elements between which the fiber material can be passed through in a contact manner, wherein at least one electrode connected or connectable to an electrical energy source is provided on at least one clamping element such that the electrode electrically contacts the fiber material passed through between the clamping elements, wherein the electrode interacts with at least one counter electrode also electrically contacted with the fiber material in such a way that a current flow is effected in the fiber material in a current-energizing section formed by the contacting of the at least one electrode and counter electrode, and wherein at least one of the clamping elements is coupled to a movement mechanism such that the distance between the clamping elements can be increased and decreased.

[0027] Accordingly, the clamping device allows the fiber material to be guided in contact between the two clamping elements, while the two clamping elements exert a clamping force on the fiber material. It has been shown that despite the clamping force and the associated increase in friction between the surfaces of the clamping elements and the fiber material, the fiber material can still be deposited continuously and reliably.

[0028] At least one of the clamping elements has an electrode that is arranged on the clamping element in such a way that the fiber material electrically contacts the electrode when the fiber material is passed between the two clamping elements while clamping force is applied. The fiber material also contacts a counter electrode, which may be located, for example, in the pressure roller or pressure shoe of the fiber laying head, or in the forming tool or the forming tool surface.

[0029] A current-carrying section is thus formed between the electrode and the counter electrode, extending along the fiber direction. The electrode and counter electrode are positioned apart from each other in the feed direction, so that the current flows in the plane of the fiber material. This ensures that a certain distance between the electrode and the counter electrode within the fiber material is energized and thus heated.

[0030] Furthermore, according to the invention, at least one of the clamping elements is coupled to a movement mechanism such that the distance between the clamping elements can be increased and decreased. This ensures that, by increasing the distance between the clamping elements, the fiber material is no longer guided in contact with at least one of the clamping elements, thereby largely eliminating the frictional resistance based on the clamping force when the distance is reduced.

[0031] This is particularly advantageous when, after repositioning the layup head to a new layup position, the fiber material feed into the layup head is restarted, requiring the fiber material to be rethreaded through the two clamping elements of the clamping device. Increasing the distance between the clamping elements creates sufficient space for the fiber material to pass between them until it reaches the layup unit of the layup head. This creates a counter-tension, allowing the clamping elements to reduce their distance and apply the clamping force necessary to energize the fiber material with the lowest possible electrical contact resistance.

[0032] According to one embodiment, the fiber laying system has a cutting device designed to cut the quasi-endless fiber material, with the clamping device of the temperature control unit being arranged downstream of the cutting device in the conveying direction.

[0033] Such a cutting device can be designed in such a way that the quasi-endless fiber material is cut by means of a sharp knife or by means of a laser or other means.

[0034] After the cutting process, the remaining fiber material in the fiber laying head is deposited onto the tool or removed from the fiber laying head, so that the transport path from the cutting unit to the tool is free of fiber material. In this case, there is also no fiber material between the clamping elements of the clamping device. Therefore, to resume fiber feeding for depositing the fiber material, it is advantageous to increase the distance between the opposing clamping elements so that the beginning of the fiber material can be guided between the clamping elements with ample clearance. Then, to temper the fiber material, the distance between the clamping elements is reduced again, ensuring the fiber material is guided through in contact.

[0035] According to one embodiment, the fiber laying system is designed such that, to cut the quasi-endless fiber material, the continuous feed is stopped and the fiber material is cut by means of the cutting device, wherein, before the continuous feed is resumed, the distance between the clamping elements is increased by means of the movement mechanism, and after the continuous feed is resumed, when the fiber material is guided between the clamping elements, the distance between the clamping elements is decreased by means of the movement mechanism until the fiber material is guided in contact between the clamping elements.

[0036] Basically, the clamping elements of the clamping device can be moved using actuators controlled by a control unit in order to increase or decrease the distance between the opposing clamping elements.

[0037] However, it is also conceivable that the clamping elements are designed to increase or decrease their distance from each other using a lever mechanism. This lever mechanism can, for example, be connected to the fiber material via at least one deflection roller in such a way that the distance between the clamping elements is adjusted depending on an axial tensile stress on the fiber material. If, for example, there is no axial tensile stress, such as after the fiber material has been cut, the clamping elements are at their maximum distance from each other. If the laying process is then resumed, the axial tensile stress of the fiber material increases, whereby the force acting on the deflection rollers via the lever mechanism reduces the distance between the clamping elements until the fiber material is guided through the clamping elements in contact.The clamping force of the clamping elements can be adjusted depending on the axial tensile stress of the fiber material. The greater the axial tensile stress, the greater the clamping force of the clamping elements. In this case, the leverage of the lever device, which acts as a clamping force on the clamping elements, is greater the greater the axial tensile stress of the fiber material.

[0038] According to one embodiment, the fiber laying head has a pressing device with which the fiber material is pressed onto the tool for laying, wherein the at least one counter electrode is arranged on the pressing device in such a way that the fiber material electrically contacts the counter electrode when laying the fiber material.

[0039] Such a pressing device can be, for example, a pressing roller or a pressing shoe. If the pressing device is a pressing roller, it is advantageous if the entire circumference of the pressing roller is formed by the counter electrode. This ensures that the fiber material maintains continuous contact with the counter electrode during deposition, thus also generating a continuous current flow. However, it is also conceivable that the counter electrode is divided into several sub-electrodes, which are insulated from each other and located around the circumference of the pressing roller, so that a continuous current flow is not generated in the fiber material during deposition.

[0040] According to one embodiment, at least one electrode is provided in each of the two clamping elements.

[0041] This makes it possible for the current to be introduced into the fiber material from both contact sides of the clamping device.

[0042] According to one embodiment, the clamping elements each have a flat contact surface along which the fiber material is guided in contact, with at least one electrode being provided in the contact surface of at least one clamping element.

[0043] In this embodiment, the clamping elements are designed as clamping jaws. The fiber material is guided over the stationary, flat contact surface of the respective clamping element (relative to the moving fiber material). This large-area contact between the fiber material and the electrode at the respective clamping elements significantly reduces the contact resistance. It has been shown that, despite the frictional contact at the clamping elements, the fiber material is not damaged during continuous lay-up. Instead, a current flow can be reliably introduced into the current-energizing section without increased contact resistance. The clamping elements are designed such that the fiber material contacts the stationary, flat contact surface, resulting in relative movement between the fiber material and the contact surface during lay-up.

[0044] It is advantageous if the contact surface of the respective clamping element, be it the electrode or the surfaces surrounding the electrode, is coated with a material or is made of a material that has a particularly low coefficient of friction.

[0045] According to one embodiment, the temperature control device is provided in the fiber laying head.

[0046] It is also advantageous if the cutting device for cutting the fiber material is also provided in the fiber laying head, with the clamping device of the temperature control device then being arranged in the fiber laying head in the conveying direction after the cutting device.

[0047] According to one embodiment, the clamping device is provided to have a cooling device in order to cool at least one clamping element.

[0048] This allows the clamping elements to be cooled, as they heat up due to friction and / or the electrical current generated during the contact-based conveying of the fiber material during the laying process. The start and end of the cooling process can be controlled by a control unit. Alternatively, the cooling device could be triggered by the previously mentioned lever mechanism.

[0049] If a clamping element also serves as an electrode, it heats up due to the electrical current passing through it. If the material in the clamping area is already heated, heat is also transferred to the clamping element from there.

[0050] The problem is also solved by the method for producing a fiber preform from a quasi-endless fiber material of a fiber composite material, wherein the fiber composite material contains the fiber material and a matrix material embedding the fiber material, wherein the fiber material is deposited onto a tool surface by means of a fiber laying system, wherein the method comprises the following steps: Continuous feeding of the quasi-endless fiber material by means of a fiber feeding device from a fiber material supply device to a fiber laying head, continuous depositing of the continuously fed fiber material onto the tool surface to produce the fiber preform, and temperature control of the quasi-endless fiber material during the continuous feeding and depositing by means of a temperature control device, wherein the fiber material is passed in contact between two opposing clamping elements of a clamping device of the temperature control device, wherein the fiber material electrically contacts at least one electrode provided on one of the clamping elements when the fiber material is passed in contact between the clamping elements, and electrically contacts at least one counter electrode, wherein an electrical voltage is applied to the electrode and / or counter electrode by means of an electrical energy source.that in a current flow section formed by the contacting of the at least one electrode and counter electrode, a current flow is caused in the fiber material, and wherein the distance between the clamping elements is increased or decreased by means of a movement mechanism coupled to the clamping elements.

[0051] According to one embodiment, it is provided that, in order to cut the quasi-endless fiber material, the continuous feed is stopped, the fiber material is cut by means of a cutting device and then the continuous feed is resumed.

[0052] The crucial point is that the material has been cut. A flexible material generally cannot be fed through a narrow, frictional gap – however, it can be pulled through with friction. Therefore, the process with the clamping gap works as long as the material is pulled through the gap. Once the material has been cut, the gap must be opened to allow the material to be fed through the clamping gap.

[0053] According to one embodiment, it is provided that before the continuous feed is resumed, the distance between the clamping elements is increased by means of the movement mechanism, and after the continuous feed is resumed, when the fiber material is guided between the clamping elements, the distance between the clamping elements is decreased by means of the movement mechanism until the fiber material is guided in contact between the clamping elements.

[0054] According to one embodiment, the fiber material between the two clamping elements is electrically contacted from both sides with at least one electrode provided in the respective clamping element.

[0055] According to one embodiment, at least one clamping element is cooled by means of a cooling device.

[0056] According to one embodiment, it is provided that the at least one clamping element is only cooled when the distance between the clamping elements has been increased to such an extent that the clamping element to be cooled does not contact the fiber material.

[0057] The invention is explained in more detail using the attached figures as examples. They show: Figure 1 schematic representation of a fiber laying system of this type; Figure 2 schematic representation during the feeding and depositing of the fiber material; Figure 3 schematic representation during the cutting of the fiber material; Figure 4 schematic representation during the restart of the fiber material feed.

[0058] Figure 1The figure shows a highly simplified schematic representation of a fiber laying system 10, which has a motion unit 11 and a fiber laying head 12 arranged on the motion unit 11 as an end effector. The quasi-endless fiber material is located in a fiber material supply unit 13 and is to be laid onto the forming surface 15 of a tool 14 by means of the fiber laying head 12. For this purpose, the quasi-endless fiber material is fed from the fiber material supply unit 13 to the fiber laying head 12 by means of a fiber feeder, so that the fiber laying head 12 can then lay the fiber material onto the forming surface 15 of the tool.

[0059] The virtually endless fiber material is primarily ribbon-shaped and can be supplied in the form of rovings or tapes. The fiber laying head can lay down multiple ribbon-shaped fiber materials simultaneously, which falls under the formulation of the fiber material.

[0060] Figure 2 Figure 1 shows, in a highly simplified schematic representation, essential elements of the fiber laying head 12. The quasi-endless fiber material 20 is visible, which is fed to a pressure roller 21 of the fiber laying head 12 in such a way that the pressure roller 21 can introduce the supplied fiber material 20 into the tool 14. In the exemplary embodiment of the Figure 2 The fiber material 20 is applied to previously laid layers of fiber material.

[0061] The fiber laying head 12 has a cutting device 22 with which the fiber material 20 can be cut. This is always necessary when the fiber laying head 12 reaches the end of the fiber preform and subsequently has to assume a new laying position without laying down any fiber material during the approach to this new laying position.

[0062] Furthermore, the fiber laying head has a feed unit 23 with which the fiber material 20 can be driven. The rollers of the feed unit 23 are actively driven and can thus convey the fiber material towards the pressure roller 21.

[0063] In the process state, as in Figure 2 As shown, both the feed unit 23 and the cutting device 22 are not in operation and are therefore deactivated.

[0064] Between the cutting device 22 and the pressure roller 21 is a temperature control device 30, which has a clamping device 31. The clamping device 31 consists of two opposing clamping elements 32a, 32b, between which the fiber material 20 is guided in contact, while the fiber material 20 is laid down by means of the pressure roller 21.

[0065] The clamping elements 32a, 32b each have a contact surface 33a, 33b along which the fiber material 20 is guided in contact. During the placement of the fiber material 20, a relative movement occurs between the contact surfaces 33a, 33b and the fiber material 20, so that the fiber material 20 is drawn over the contact surfaces 33a, 33b.

[0066] The clamping device 31 is further designed such that, during the laying down of the fiber material 20, it exerts a clamping force on the fiber material guided between them by means of the clamping elements 32a, 32b, by pressing the clamping elements towards each other with a certain force.

[0067] The contact surfaces 33a, 33b of the contact elements 32a, 32b are at least partially designed as electrodes 34, which are connected to an electrical voltage source (not shown) via a control device in order to apply an electrical voltage to the electrodes 34 when the fiber material is placed on the tool.

[0068] By applying the clamping force using the clamping elements 32a, 32b, the contact resistance between the electrodes and the fiber material 20 is reduced, making the entire process more energy-efficient.

[0069] The pressure roller 21 also has a counter electrode 35 on its outer surface, which is likewise connected to the electrical voltage source via the control device. When an electrical voltage is applied to the electrodes 34 of the clamping device 31, a current-carrying section 36 is created between the electrodes 34 and the counter electrode 35 in the fiber material 20, within which a current flows in the electrically conductive fiber material 20. Due to the electrical resistance of the electrically conductive fiber material 20, the current flow heats the fiber material 20 to the desired process temperature.

[0070] Figure 3Figure 22 shows the process step in which the fiber material is cut using the cutting device 22. Both the feed device 23 and the clamping device 31 hold the fiber material under tensile tension, enabling the cutting device 22 to cut it. The remaining portion of the fiber material, from the cutting device 22 to the pressure roller 21, is then deposited.

[0071] Figure 4 Finally, it shows the process step of restarting after the fiber material has been cut in Figure 3 The feed unit 23 is actively driven and conveys the fiber material towards the pressure roller 21. The cutting device 22 is back in its starting position.

[0072] The clamping elements 32a, 32b of the clamping device 31 are moved into an open position so that there is sufficient space between the clamping elements for the fiber material 20. When the fiber material 20 has reached the pressure roller 21 and thus sufficient tensile tension is applied to the fiber material, the feed unit 23 returns to its starting position and the clamping elements of the clamping device 31 move towards each other again, reducing their distance to establish the necessary clamping force for the current application. From then on, the process begins as described in Figure 1 has been shown anew. Reference symbol list

[0073] 10 Fiber laying system 11 Motion unit 12 Fiber laying head 13 Fiber material supply device 14 Tool 15 Tool surface 20 Fiber material 21 Pressure roller 22 Cutting device 23 Feed unit 30 Temperature control device 31 Clamping device 32a, 32b Clamping elements 33a, 33b Contact surface 34 Electrode 35 Counter electrode 36 Current supply section

Claims

1. Fiber laying apparatus (10) for producing a fiber preform from a quasi-endless fiber material (20) of a fiber composite material, which contains the fiber material (20) and a matrix material, by depositing the fiber material (20) onto a tool surface (15), comprising - a fiber laying head (12) configured to lay the fiber material (20) continuously supplied to the fiber laying head (12) to produce the fiber preform, - a fiber feed device designed to continuously feed the quasi-endless fiber material (20) from a fiber material supply device (13) to the fiber laying head (12), and - a tempering device (30) designed to temper the quasi-endless fiber material (20) during continuous feeding and depositing, characterized in that - the tempering device (30) has a clamping device (31) with two opposing clamping elements (32a, 32b) between which the fiber material (20) can be passed in contact, - wherein at least one electrode (34) connected or connectable to an electrical energy source is provided on at least one clamping element (32a, 32b) in such a way that the electrode (34) makes electrical contact with the fiber material (20) passed in contact between the clamping elements (32a, 32b), - wherein the electrode (34) interacts with at least one counterelectrode (35) which is also electrically contacted with the fiber material (20) in such a way that a current flow is caused in the fiber material (20) in a current segment (36) formed by the contacting of at least one electrode (34) and counterelectrode (35), and - wherein at least one of the clamping elements (32a, 32b) is coupled to a movement mechanism in such a way that the distance between the clamping elements (32a, 32b) can be increased and decreased.

2. Fiber laying device (10) according to claim 1, characterized in that the fiber laying device (10) has a cutting device (22) which is designed to cut the quasi-endless fiber material (20), wherein the clamping device (31) of the tempering device (30) is arranged in the conveying direction after the cutting device (22).

3. Fiber laying device (10) according to claim 2, characterized in that the fiber laying device (10) is designed such that, in order to cut the quasi-endless fiber material (20), the continuous feed is stopped and the fiber material (20) is cut by means of the cutting device (22), whereby, before the continuous feed is resumed, the distance between the clamping elements (32a, 32b) is increased before the continuous feed is resumed by means of the movement mechanism, and after the continuous feed is resumed, when the fiber material (20) is guided between the clamping elements (32a, 32b), the distance between the clamping elements (32a, 32b) is reduced by means of the movement mechanism until the fiber material (20) is guided in contact between the clamping elements (32a, 32b).

4. Fiber laying device (10) according to one of the preceding claims, characterized in that the fiber laying head (12) has a pressing device with which the fiber material (20) is pressed onto the tool (14) for laying, wherein the at least one counter electrode (35) is arranged on the pressing device in such a way that the counter electrode (35) makes electrical contact with the fiber material (20) when the fiber material (20) is laid down.

5. Fiber laying system (10) according to one of the preceding claims, characterized in that at least one electrode (34) is provided in each of the two clamping elements (32a, 32b).

6. Fiber laying device (10) according to one of the preceding claims, characterized in that the clamping elements (32a, 32b) each have a flat contact surface (33a, 33b) along which the fiber material (20) is guided in contact, wherein the at least one electrode (34) is provided in the contact surface (33a, 33b) of at least one clamping element (32a, 32b).

7. Fiber laying device (10) according to one of the preceding claims, characterized in that the tempering device (30) is provided in the fiber laying head (12).

8. Fiber laying device (10) according to one of the preceding claims, characterized in that the clamping device (31) has a cooling device for cooling at least one clamping element (32a, 32b).

9. Method for producing a fiber preform from a quasi-endless fiber material (20) of a fiber composite material, which contains the fiber material (20) and a matrix material, wherein the fiber material (20) is laid down on a tool surface (15) by means of a fiber laying device (10), wherein the method comprises the following steps: - continuously feeding the quasi-endless fiber material (20) by means of a fiber feed device from a fiber material supply device (13) to a fiber laying head (12), - continuous deposition of the continuously fed fiber material (20) on the tool surface (15) to produce the fiber preform, and - tempering the quasi-endless fiber material (20) during continuous feeding and depositing by means of a tempering device (30), characterized in that - the fiber material (20) is passed through between two opposing clamping elements (32a, 32b) of a clamping device (31) of the tempering device (30) in contact, - wherein the fiber material (20) is electrically contacted by at least one electrode (34) provided on one of the clamping elements (32a, 32b) when the fiber material (20) is passed through the clamping elements (32a, 32b) in contact, and at least one counterelectrode (35) is electrically contacted, - whereby an electrical voltage is applied to the electrode (34) and / or counterelectrode (35) by means of an electrical energy source in such a way that a current flow is caused in the fiber material (20) in a current segment (36) formed by the contact between the at least one electrode (34) and counterelectrode (35), and - wherein the distance between the clamping elements (32a, 32b) is increased or decreased by means of a movement mechanism coupled to the clamping elements (32a, 32b).

10. Method according to claim 9, characterized in that, in order to cut the quasi-endless fiber material (20), the continuous feed is stopped, the fiber material (20) is cut by means of a cutting device (22), and then the continuous feed is resumed.

11. Method according to claim 10, characterized in that, before the continuous feed is resumed by means of the movement mechanism, the distance between the clamping elements (32a, 32b) is increased and, after the continuous feed is resumed, when the fiber material (20) is guided between the clamping elements (32a, 32b), the distance between the clamping elements (32a, 32b) is reduced by means of the movement mechanism until the fiber material (20) is guided in contact between the clamping elements (32a, 32b).

12. Method according to one of claims 9 to 11, characterized in that the fiber material (20) is electrically contacted between the two clamping elements (32a, 32b) from both sides by at least one electrode (34) provided in each respective clamping element (32a, 32b).

13. Method according to one of claims 9 to 12, characterized in that at least one clamping element (32a, 32b) is cooled by means of a cooling device.

14. Method according to claim 13, characterized in that the at least one clamping element (32a, 32b) is only cooled when the distance between the clamping elements (32a, 32b) has been increased in such a way that the clamping element (32a, 32b) to be cooled does not contact the fiber material (20).