Repair procedure for a molded part

Abstract

Repair method for a molded part made of a plastic material, in which a repair part made of a plastic material is placed on a repair area of ​​the molded part and the repair part is bonded to the repair area of ​​the molded part by the application of heat, wherein the heat is applied by means of a coil device (10), wherein the coil device (10) comprises at least one current-carrying high-frequency strand (18) and a support (12) for the at least one high-frequency strand (18), wherein the at least one support (12) is a mesh (14) and the at least one high-frequency strand (18) is held by one or more retaining threads (46) which are in contact with the at least one high-frequency strand (18) and webs (16) of the mesh (14), and the coil device (10) is adapted in its geometric shape to the repair area and / or the repair part.

Description

[0001] The invention relates to a repair method for a molded part made of a plastic material, in which a repair part made of a plastic material is placed on a repair area of ​​the molded part and the repair part is connected to the repair area of ​​the molded part by applying heat.

[0002] DE 10 2011 076 463 A1 discloses a repair method for a molded part made of a plastic material. In this method, a repair element made of the plastic material is applied to a damaged area of ​​the molded part and bonded to it by applying heat. The heat is generated by a passive heating element made of an electrically conductive material, which is exposed to an alternating magnetic field.

[0003] An induction heating coil is known from EP 0 271 250 A1.

[0004] The invention is based on the object of providing a repair method of the type mentioned above, which has variable application possibilities.

[0005] This object is achieved according to the invention in the repair method mentioned at the outset in that the heat is introduced using a coil device, wherein the coil device comprises at least one current-carrying high-frequency stranded wire and a carrier for the at least one high-frequency stranded wire, wherein the at least one carrier is a mesh network and the at least one high-frequency stranded wire is held by one or more holding threads which bear against the at least one high-frequency stranded wire and webs of the mesh network, and the coil device is adapted in its geometric shape to the repair area and / or the repair part.

[0006] In the repair method according to the invention, a coil device can be used in an advantageous manner, wherein the coil device is adapted in its geometric shape to the repair area and / or the repair part.

[0007] This makes it possible to carry out repairs on molded parts even with complex and, in particular, single or multiple curved geometric shapes.

[0008] In particular, the repair area and / or the repair part is curved singly or multiply, and the mesh of the coil device, and thus the entire coil device, is curved accordingly. This allows for optimized heat transfer.

[0009] A coil device is used, comprising at least one current-carrying high-frequency stranded wire and a carrier for the at least one high-frequency stranded wire, characterized in that the at least one carrier is a mesh network and that the at least one high-frequency stranded wire is held by one or more holding threads which bear against the at least one high-frequency stranded wire and webs of the mesh network.

[0010] The mesh provides a flexible and, in particular, bendable support. This makes it possible to modify the geometric surface shape of the coil device and, for example, to design it with a single or multiple curved surface.

[0011] The webs of the mesh provide attachment elements for securing the at least one high-frequency strand via one or more retaining threads. This allows for a simple and secure fixation of the at least one high-frequency strand to the mesh. The fixation can be designed in such a way that the geometric surface shape can be adapted.

[0012] In this way, a flexible coil device and in particular a surface induction heating device can be provided in a simple manner.

[0013] In particular, the meshes of the mesh net are formed between webs of the mesh net. The webs can serve as a support element for the at least one retaining thread. A retaining thread can be threaded through the meshes to form retaining loops.

[0014] It is particularly advantageous if the at least one high-frequency strand is sewn to the mesh via the at least one retaining thread. This allows a winding to be easily created and secured to the mesh.

[0015] It is advantageous if the mesh network has a first side and a second side opposite the first side, wherein the at least one high-frequency stranded wire is arranged on the second side, wherein in particular at least 80% and preferably at least 90% of the at least one high-frequency stranded wire, based on its total length, is arranged on the second side. This allows a large portion of a winding of the high-frequency stranded wire to be arranged on only one side of the mesh network. This allows a flat coil to be easily realized, in particular to create a heating coil.

[0016] It can be provided that at least one magnetic flux concentrator layer is arranged on the first side, wherein in particular the at least one magnetic flux concentrator layer is designed to be flexible. This allows flux concentration to be achieved in a frontal area in front of the second side, for example, in order to create an effective heating coil.

[0017] Furthermore, a first outer electrical insulating layer and a second outer electrical insulating layer can be provided, between which the mesh network is positioned, wherein, in particular, the first outer electrical insulating layer and the second outer electrical insulating layer are designed to be flexible. This allows the realization of a compactly constructed coil device that is protected from the environment.

[0018] From a design perspective, it is advantageous if the mesh is a textile structure. In particular, it is made of an electrically non-conductive material.

[0019] It is particularly advantageous if the mesh is flexible. This allows the coil device to be formed into a variable geometric surface shape, which can, for example, be single- or multiply curved, or even have one or more edges.

[0020] In one embodiment, the meshes of the mesh network are rectangular or square. Such a mesh network can be manufactured easily.

[0021] A high-frequency source device is provided, to which the at least one high-frequency stranded wire is connected. The high-frequency source device provides the corresponding alternating electromagnetic field, which can be used, for example, to realize induction heating.

[0022] The coil device is designed, in particular, as a surface induction heating device. This allows for the introduction of heat in a defined manner, with the shape of the heat source being geometrically adaptable.

[0023] The at least one high-frequency strand is arranged in a flat winding on the mesh. This allows for the effective realization of a surface induction heating device.

[0024] The following description of preferred embodiments, taken in conjunction with the drawings, serves to further explain the invention. They show: Fig. 1 a schematic plan view of an embodiment of a coil device according to the invention; Fig. 2 a sectional view along the line 2-2 according to Fig. 1; Fig. 3 a schematic representation of an embodiment of a high-frequency stranded wire; Fig. 4 an embodiment of a first geometric shape of the coil device; and Fig. 5 a second embodiment of a geometric shape.

[0025] An embodiment of a coil device which is shown in the Fig. 1 and Fig. 2 and designated there by 10, comprises a carrier 12. This carrier 12 is designed as a mesh network 14.

[0026] The mesh net, for example, is a textile structure, such as a woven or knitted fabric.

[0027] The mesh 14 comprises webs 16, which are made, for example, of a thread material. The webs delimit meshes 17. The meshes 17 of the mesh 14 are, in particular, rectangular or square.

[0028] The mesh net 14 is bendable as a whole.

[0029] A current-carrying high-frequency strand 18 is arranged on the mesh network 14.

[0030] The high-frequency stranded wire 18 is used to carry a high-frequency alternating current. The high-frequency stranded wire 18 is a bundle 20 of individual wires 22, each of which is electrically insulated from one another by an insulation 24. This effectively increases the cross-section involved in the current flow compared to a solid wire, while reducing the influence of the skin effect. Furthermore, the displacement of charge carriers to one side of the corresponding conductor is reduced by the magnetic field of a coil made from it (proximity effect).

[0031] In one embodiment, the wire bundle 20 is arranged in a sheath 26, which is in particular multi-layered.

[0032] The coil device 10 is associated with a high-frequency source device 28 ( Fig. 1). All individual wires 22 of the wire bundle 20 are electrically connected to corresponding terminals 30a, 30b of the high-frequency source device 28.

[0033] The high-frequency source device 28 serves to generate a high-frequency electromagnetic alternating field, which is applied to the high-frequency stranded wire 18. The frequency is at least 20 kHz and is typically approximately 150 kHz.

[0034] The high frequency source device 28 comprises an electronic switching device for generating the corresponding alternating field when the primary electrical source is a direct current source.

[0035] The high-frequency stranded wire 18 is a linearly bending flexible cable.

[0036] The mesh network 14 has a first side 32 and a second side 34 opposite the first side ( Fig. 2). The high-frequency stranded wire 18 is arranged exclusively or largely on the second side 34.

[0037] In the Fig. In the embodiment shown in Figure 1, the high-frequency stranded wire 18 has a first end 36, which is electrically connected to the terminal 30a, and a second end 38, which is electrically connected to the terminal 30b. The first end 36 is arranged on the second side 34 of the mesh network 14.

[0038] The second end 38 is arranged at a region 40 of the high-frequency stranded wire 18. This region 40 can be positioned on the first side 32 if overlapping of regions of the high-frequency stranded wire 18 is to be avoided.

[0039] At least 80% of the length of the high-frequency stranded wire 18 relative to the total length of the high-frequency stranded wire 18 is arranged on the second side 34 of the mesh network 14.

[0040] The high-frequency stranded wire 18 is positioned on the mesh network 14 as a flat coil. It has, for example, a spiral arrangement.

[0041] The high-frequency stranded wire 18 encloses a surface area 42, wherein windings of the high-frequency stranded wire 18 are located in the surface area 42.

[0042] A winding axis 44 of the high-frequency strand 18 lies transversely and in particular perpendicular to the mesh network 14.

[0043] The high-frequency stranded wire 18 is held to the mesh 14 by one or more holding threads 46. A holding thread 46 rests against the high-frequency stranded wire 18 and against a web 16 of the mesh 14, and rests in opposite directions to secure the high-frequency stranded wire 18 to the mesh 14 by the holding thread(s) 46.

[0044] The high-frequency strand 18 is sewn to the mesh 14 via the holding thread(s) 46.

[0045] In one embodiment, a retaining thread 46 is provided, which rests against the high-frequency strand 18, is passed through meshes 17, and in turn rests against a side of the web 18 facing away from the high-frequency strand 18. The retaining thread 18 runs in a zigzag or meandering pattern.

[0046] In one embodiment, a magnetic flux concentrator layer 48 is arranged on the first side 32 of the mesh network 14. This magnetic flux concentrator layer 48, which is made of a material with appropriate magnetic permeability, serves to concentrate the magnetic flux generated during operation of the coil device 10 into a forecourt area in front of the second side 34.

[0047] Furthermore, a first outer electrical insulating layer 50 and a corresponding second outer electrical insulating layer 52 may be provided. These outer electrical insulating layers 50 and 52 form the surface of the coil device 10. Between these, the mesh network 14 with the high-frequency stranded wire 18 arranged thereon and, if appropriate, the magnetic flux concentrator layer 48 is arranged.

[0048] The outer electrical insulating layers 50, 52 are made, for example, of a silicone material.

[0049] The outer electrical insulation layers 50, 52 and the magnetic flux concentrator layer 48 are designed to be flexible.

[0050] The mesh 14 is flexible. The high-frequency stranded wire 18 is bendable with the mesh 14. The connection of the high-frequency stranded wire 18 to the mesh 14 via the retaining thread(s) 46 enables the bendability.

[0051] The coil device 10 can be made into different geometric shapes, as shown in Fig. 4 and Fig. 5. For example, a single curvature or multiple curvatures are possible.

[0052] The coil device 10 is designed as a surface induction heating device. This device can emit a corresponding electromagnetic field, which in particular has an intensity distribution in the area in front of the second side 34, which, for example, is bell-shaped and by means of which induction heating can be realized.

[0053] The position of the high-frequency strand 18 on the mesh network 14 determines the field formation.

[0054] The flexibility of the coil device 10 allows the geometric shape to be adjusted for surface heating. This makes it possible to provide a heating surface that is adaptable to an application, and in particular, adaptable to a single- or multiply-curved surface of an application.

[0055] An application process is a repair process for a molded part made of a plastic material. The plastic material can be fiber-reinforced or non-fiber-reinforced.

[0056] In such a method, as described, for example, in DE 10 2011 076 463 A1, to which express reference is made, a repair element made of a plastic material (which may be the same material as that of the molded part or may be a different material) is placed on a damaged area of ​​the molded part and a material-to-material bond is achieved by the action of heat.

[0057] According to the invention, the coil device 10 is then used for this purpose. The geometric shape of the coil device 10 is adapted via the mesh network 14 to the shape of the repair area of ​​the molded part and / or the geometric shape of the repair element in order to enable optimized heat input. This makes it possible to repair even geometrically complex components, in which a repair area, in particular, has a single or multiply curved geometric shape.

[0058] A coil device with a variable geometric shape is provided. In particular, a surface induction heating device with a variable geometric shape is provided. List of reference symbols 10 Coil device 12 carriers 14 mesh net 16 bridges 17 stitches 18 high-frequency strands 20 wire bundles 22 single wires 24 Insulation 26 Wrapping 28 High-frequency source device 30a, b connection 32 First page 34 Second page 36 First End 38 Second End 40 area 42 surface area 44 Winding axis 46 holding thread 48 Magnetic flux concentrator layer 50 First outer electrical insulation layer 52 Second outer electrical insulation layer

Claims

[1] Repair method for a molded part made of a plastic material, in which a repair part made of a plastic material is placed on a repair area of the molded part and the repair part is connected to the repair area of the molded part by introducing heat, the heat being introduced using a coil device (10), the coil device (10) comprising at least one current-carrying high-frequency stranded wire (18) and a carrier (12) for the at least one high-frequency stranded wire (18), the at least one carrier (12) being a mesh network (14) and the at least one high-frequency stranded wire (18) being held by one or more holding threads (46) which bear against the at least one high-frequency stranded wire (18) and webs (16) of the mesh network (14), and the coil device (10) is adapted in its geometric shape to the repair area and / or the repair part. [2] Repair method according to claim 1, characterized bythat the repair area and / or the repair part is curved once or multiple times and the mesh network (14) of the coil device (10) is curved to suit. [3] Repair method according to claim 1 or 2, characterized by that the meshes (17) of the mesh network (14) are formed between webs (16) of the mesh network (14). [4] Repair method according to one of the preceding claims, characterized by that the at least one high-frequency strand (18) is sewn to the mesh (14) via the at least one holding thread (46). [5] Repair method according to one of the preceding claims, characterized byin that the mesh network (14) has a first side (32) and a second side (34) opposite the first side (32), wherein the at least one high-frequency strand (18) is arranged on the second side (34), wherein in particular at least 80% of the at least one high-frequency strand (18) based on its total length is arranged on the second side (34). [6] Repair method according to claim 5, characterized by that at least one magnetic flux concentrator layer (48) is arranged on the first side, wherein in particular the at least one magnetic flux concentrator layer (48) is designed to be flexible. [7] Repair method according to claim 5 or 6, characterized by a first outer electrical insulating layer (50) and a second outer electrical insulating layer (52), between which the mesh network (14) is positioned, wherein in particular the first outer electrical insulating layer (50) and the second outer electrical insulating layer (52) are designed to be flexible. [8] Repair method according to one of the preceding claims, characterized by that the mesh net (14) is a textile structure. [9] Repair method according to one of the preceding claims, characterized by that the mesh net (14) is flexible. [10] Repair method according to one of the preceding claims, characterized by that meshes (17) of the mesh network (14) are rectangular or square. [11] Repair method according to one of the preceding claims, characterized by a high-frequency source device (28) to which the at least one high-frequency strand (18) is connected. [12] Repair method according to one of the preceding claims, characterized by training as a surface induction heating device. [13] Repair method according to claim 12, characterized by that the at least one high-frequency strand (18) is arranged in a flat winding on the mesh network (14).

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