Abstract

A heat sink for use in electromagnetic welding of molded parts includes reinforcing fibers embedded in a matrix material, where substantially all of the reinforcing fibers are oriented unidirectionally in a fiber direction, where the reinforcing fibers have a thermal conductivity at room temperature from 100-1000 W/m.° K and an electrical resistivity at room temperature from 0.5-10μΩ.m, and where the matrix material comprises a high temperature resistant material, optionally a thermosetting resin, having a glass transition temperature Tg above 350° C. The heat sink is used in a method of connecting surfaces of a first molded part and a second molded part by electromagnetic welding. Cooling of the outer surface of the first molded part is provided by the heat sink in direct contact with the outer surface.

IPC Classes  ?

• B29C 65/00 - Joining of preformed partsApparatus therefor
• B29C 65/32 - Induction

Abstract

A method of connecting surfaces of first and second molded parts by electromagnetic welding. The first molded part includes a first lightning strike protection (LSP) material at an outer surface thereof. The method includes providing the first and second molded parts to comprise a heat meltable coupling and an induction-sensitive component; bringing together the surfaces to be connected and pressurizing the surfaces by providing a pressurizing body against the molded parts; generating an electromagnetic field in the surfaces to be connected of the molded parts by means of an inductor, thereby heat melting the coupling means by heating the induction-sensitive component; cooling the outer surface of the first molded part by providing a heat sink in contact with the outer surface; and coupling the molded parts under pressure by the molten heat meltable coupling means. A second lightning strike protection (LSP) material is provided at the surfaces to be connected.

IPC Classes  ?

• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B29C 35/00 - Heating, cooling or curing, e.g. crosslinking or vulcanisingApparatus therefor
• B29C 35/16 - Cooling
• B29C 65/54 - Applying the adhesive between pre-assembled parts
• B29L 31/30 - Vehicles, e.g. ships or aircraft, or body parts thereof
• B64D 45/02 - Lightning protectorsStatic dischargers

Abstract

A device for electromagnetic spot welding of moulded parts includes a pressurizing body, first displacing means configured for moving a pressurizing surface of the pressurizing body against the moulded parts or vice versa to join contact surfaces of the moulded parts to be fused by welding under pressure, an inductor provided in the pressurizing body and configured to generate an electromagnetic field in at least the contact surfaces of the moulded parts, and a mechanical fastener configured to be heated by the electromagnetic field generated by the inductor, or by other means. Second displacing means are configured for moving the mechanical fastener towards the moulded parts and drive the heated mechanical fastener into the joined moulded parts to a position further than the contact surfaces of the moulded parts. A method for electromagnetic welding of moulded parts using the device.

IPC Classes  ?

• B29C 65/00 - Joining of preformed partsApparatus therefor

Abstract

A device for electromagnetic spot welding of moulded parts includes a pressurizing body, and first displacing means for moving a pressurizing body against the moulded parts or vice versa to join contact surfaces of the moulded parts to be fused by welding under pressure. The pressurizing body includes an inductor that generates an electromagnetic field in at least the contact surfaces of the moulded parts. A shielding is provided in the pressurizing body around at least a part of the inductor to protect against overheating. A heat sink is provided in the pressurizing body in between the inductor and the pressurizing surface in direct contact with the inductor and the pressurizing surface. The inductor includes cooling means configured for cooling the inductor, the shielding and the heat sink. A method for electromagnetic welding of moulded parts using the device.

IPC Classes  ?

• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B25J 11/00 - Manipulators not otherwise provided for
• B29C 65/78 - Means for handling the parts to be joined, e.g. for making containers or hollow articles
• B29C 35/16 - Cooling

Abstract

A fiber-reinforced composite laminate for use in electromagnetic welding of molded parts of said laminates. The laminate has a plurality of structural layers, each formed of electrically conductive fibers embedded in a thermoplastic matrix. Eddy currents may be induced in the electrically conductive fibers by an electrical conductor that generates an electromagnetic field. The structural layers include a first, a second and, optionally, a third pair of two adjacently positioned structural layers. The first pair has an intermediate layer which allows eddy currents to flow between the two structural layers of the first pair. The second pair has an intermediate layer which prevents eddy currents from flowing between the two structural layers of the second pair. The optional third pair does not have an intermediate layer. The laminate shows efficient heating by an electromagnetic field.

IPC Classes  ?

• B32B 5/26 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous one layer being a fibrous or filamentary layer another layer also being fibrous or filamentary
• B29C 65/00 - Joining of preformed partsApparatus therefor
• B29C 65/38 - Impulse heating
• B32B 5/02 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by structural features of a layer comprising fibres or filaments

Abstract

A method for determining an offset of the center of gravity (CoG) of an elongated body with respect to a geometrical center in a plane of the elongated body is described. The method comprises providing a first rotation axis and a second rotation axis at a distance to the first rotation axis and both perpendicular to the plane and at offset positions to the geometrical center of the elongated body. A subsequent step involves balancing the elongated body on the first rotation axis into an equilibrated first balanced position and subsequently balancing the elongated body on the second rotation axis into an equilibrated second balanced position. A first and a second rotation angle in the plane of the elongated body in the equilibrated first and second balanced positions respectively is then measured. The offset of the CoG in the plane is then determined by geometrical triangulation using the measured rotation angles.

IPC Classes  ?

• G01M 1/12 - Static balancingDetermining position of centre of gravity

Abstract

ΩΩ.m, and wherein the matrix material comprises a high temperature resistant material, optionally a thermosetting resin, having a glass transition temperature Tg above 350°C. The heat sink is advantageously used in a method of connecting surfaces of a first molded part and a second molded part by electromagnetic welding. Cooling of the outer surface of the first molded part is provided by the heat sink in direct contact with the outer surface.

IPC Classes  ?

• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B29L 31/30 - Vehicles, e.g. ships or aircraft, or body parts thereof

Abstract

Described is a heat sink for use in electromagnetic welding of molded parts. The heat sink comprises reinforcing fibers embedded in a matrix material, wherein substantially all of the reinforcing fibers are oriented unidirectionally in a fiber direction, wherein the reinforcing fibers have a thermal conductivity at room temperature from 100-1000 W/m.°K and an electrical resistivity at room temperature from 0.5-10 ??.m, and wherein the matrix material comprises a high temperature resistant material, optionally a thermosetting resin, having a glass transition temperature Tg above 350°C. The heat sink is advantageously used in a method of connecting surfaces of a first molded part and a second molded part by electromagnetic welding. Cooling of the outer surface of the first molded part is provided by the heat sink in direct contact with the outer surface.

IPC Classes  ?

• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction

Abstract

Described is a method of connecting surfaces of a first molded part and a second molded part by electromagnetic welding. The first molded part is provided with a first lightning strike protection (LSP) material at an outer surface thereof. The method comprises providing the first and the second molded part to comprise a heat meltable coupling means and an induction-sensitive component; bringing together the surfaces to be connected and pressurizing the surfaces to be connected by providing a pressurizing surface of a pressurizing body against the molded parts; generating an electromagnetic field in at least the surfaces to be connected of the molded parts by means of an inductor, thereby heat melting the coupling means by heating the induction-sensitive component; cooling the outer surface of the first molded part by providing a heat sink in direct contact with the outer surface; and coupling the molded parts under pressure by the molten heat meltable coupling means. A second lightning strike protection (LSP) material is provided at the surfaces to be connected.

IPC Classes  ?

• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction

Abstract

Described is a method of connecting surfaces of a first molded part and a second molded part by electromagnetic welding. The first molded part is provided with a first lightning strike protection (LSP) material at an outer surface thereof. The method comprises providing the first and the second molded part to comprise a heat meltable coupling means and an induction-sensitive component; bringing together the surfaces to be connected and pressurizing the surfaces to be connected by providing a pressurizing surface of a pressurizing body against the molded parts; generating an electromagnetic field in at least the surfaces to be connected of the molded parts by means of an inductor, thereby heat melting the coupling means by heating the induction-sensitive component; cooling the outer surface of the first molded part by providing a heat sink in direct contact with the outer surface; and coupling the molded parts under pressure by the molten heat meltable coupling means. A second lightning strike protection (LSP) material is provided at the surfaces to be connected.

IPC Classes  ?

• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B29C 65/48 - Joining of preformed partsApparatus therefor using adhesives
• B29C 65/50 - Joining of preformed partsApparatus therefor using adhesives using adhesive tape

Abstract

A fuselage structure of an aircraft includes a fuselage skin, and a plurality of frame elements spaced apart from one another in a direction parallel to the aircraft longitudinal axis for supporting the fuselage skin. The fuselage skin includes a plurality of interconnected fiber-reinforced composite skin panels that extend between each pair of frame elements and are connected thereto. The composite skin panels further comprise a stiffener integrally formed in each composite skin panel. A method for manufacturing the fuselage skin. The composite skin panels may be interconnected and/or connected to a frame element through an induction welded connection.

IPC Classes  ?

• B64C 1/12 - Construction or attachment of skin panels
• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B29D 99/00 - Subject matter not provided for in other groups of this subclass
• B29L 31/30 - Vehicles, e.g. ships or aircraft, or body parts thereof
• B64C 1/06 - FramesStringersLongerons
• B64C 1/00 - FuselagesConstructional features common to fuselages, wings, stabilising surfaces or the like

Abstract

Described is a device (1) for electromagnetic spot welding of moulded parts (2, 3). The device (1) comprises a pressurizing body (10); first displacing means (50) configured for moving a pressurizing surface (100) of the pressurizing body (10) against the moulded parts (2, 3) or vice versa to join contact surfaces (20, 30) of the moulded parts (2, 3) to be fused by welding under pressure; an inductor (11) provided in the pressurizing body (10) and configured to generate an electromagnetic field in at least the contact surfaces (20, 30) of the moulded parts (2, 3); and a mechanical fastener (6) that is configured to be heated by the electromagnetic field generated by the inductor (11), or by other means, and second displacing means (7) configured for moving the mechanical fastener (6) towards the moulded parts (2, 3) and drive the heated mechanical fastener (6) into the joined moulded parts (2, 3) to a position further than the contact surfaces (20, 30) of the moulded parts (2, 3). A method for electromagnetic welding of moulded parts (2, 3) using the device (1) is also disclosed.

IPC Classes  ?

• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B29C 65/46 - Joining a heated non-plastics element to a plastics element heated by induction
• B29C 65/48 - Joining of preformed partsApparatus therefor using adhesives
• B29C 65/56 - Joining of preformed partsApparatus therefor using mechanical means
• B29C 65/72 - Joining of preformed partsApparatus therefor by combined operations, e.g. welding and stitching

Abstract

Described is a device (1) for electromagnetic spot welding of moulded parts (2, 3). The device (1) comprises a pressurizing body (10), and first displacing means (50) for moving a pressurizing surface (100) of the pressurizing body (10) against the moulded parts (2, 3) or vice versa to join contact surfaces (20, 30) of the moulded parts (2, 3) to be fused by welding under pressure. The pressurizing body (10) further comprises an inductor (11) that generates an electromagnetic field in at least the contact surfaces (20, 30) of the moulded parts (2, 3). A shielding (12) is provided in the pressurizing body (10) around at least a part of the inductor (11) to protect against overheating. A heat sink (13) is provided in the pressurizing body (10) in between the inductor (11) and the pressurizing surface (100) in direct contact with the inductor (11) and the pressurizing surface (100). The inductor (11) is equipped with cooling means (111) configured for cooling the inductor (11), the shielding (12) and the heat sink (13). A method for electromagnetic welding of moulded parts (2, 3) using the device (1) is also disclosed.

IPC Classes  ?

• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B29C 65/46 - Joining a heated non-plastics element to a plastics element heated by induction
• B29C 65/56 - Joining of preformed partsApparatus therefor using mechanical means
• B29C 65/72 - Joining of preformed partsApparatus therefor by combined operations, e.g. welding and stitching
• B29C 65/48 - Joining of preformed partsApparatus therefor using adhesives
• B29K 101/12 - Thermoplastic materials
• B29K 105/06 - Condition, form or state of moulded material containing reinforcements, fillers or inserts
• B29K 307/04 - Carbon

Abstract

Described is a device (1) for electromagnetic spot welding of moulded parts (2, 3). The device (1) comprises a pressurizing body (10); first displacing means (50) configured for moving a pressurizing surface (100) of the pressurizing body (10) against the moulded parts (2, 3) or vice versa to join contact surfaces (20, 30) of the moulded parts (2, 3) to be fused by welding under pressure; an inductor (11) provided in the pressurizing body (10) and configured to generate an electromagnetic field in at least the contact surfaces (20, 30) of the moulded parts (2, 3); and a mechanical fastener (6) that is configured to be heated by the electromagnetic field generated by the inductor (11), or by other means, and second displacing means (7) configured for moving the mechanical fastener (6) towards the moulded parts (2, 3) and drive the heated mechanical fastener (6) into the joined moulded parts (2, 3) to a position further than the contact surfaces (20, 30) of the moulded parts (2, 3). A method for electromagnetic welding of moulded parts (2, 3) using the device (1) is also disclosed.

IPC Classes  ?

• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B29C 65/46 - Joining a heated non-plastics element to a plastics element heated by induction
• B29C 65/56 - Joining of preformed partsApparatus therefor using mechanical means
• B29C 65/72 - Joining of preformed partsApparatus therefor by combined operations, e.g. welding and stitching
• B29C 65/48 - Joining of preformed partsApparatus therefor using adhesives
• B29K 101/12 - Thermoplastic materials
• B29K 105/06 - Condition, form or state of moulded material containing reinforcements, fillers or inserts
• B29K 307/04 - Carbon

Abstract

Described is a device (1) for electromagnetic spot welding of moulded parts (2, 3). The device (1) comprises a pressurizing body (10), and first displacing means (50) for moving a pressurizing surface (100) of the pressurizing body (10) against the moulded parts (2, 3) or vice versa to join contact surfaces (20, 30) of the moulded parts (2, 3) to be fused by welding under pressure. The pressurizing body (10) further comprises an inductor (11) that generates an electromagnetic field in at least the contact surfaces (20, 30) of the moulded parts (2, 3). A shielding (12) is provided in the pressurizing body (10) around at least a part of the inductor (11) to protect against overheating. A heat sink (13) is provided in the pressurizing body (10) in between the inductor (11) and the pressurizing surface (100) in direct contact with the inductor (11) and the pressurizing surface (100). The inductor (11) is equipped with cooling means (111) configured for cooling the inductor (11), the shielding (12) and the heat sink (13). A method for electromagnetic welding of moulded parts (2, 3) using the device (1) is also disclosed.

IPC Classes  ?

• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B29C 65/46 - Joining a heated non-plastics element to a plastics element heated by induction
• B29C 65/48 - Joining of preformed partsApparatus therefor using adhesives
• B29C 65/56 - Joining of preformed partsApparatus therefor using mechanical means
• B29C 65/72 - Joining of preformed partsApparatus therefor by combined operations, e.g. welding and stitching

Abstract

A tooling for use in a method for electromagnetic welding of two contacted surfaces of molded parts. The tooling includes a rubber body and pressurizing means for pressurizing the rubber body and applying pressure to the contacted surfaces. The rubber body includes an embedded stiff body shaped such as to define different rubber body thicknesses in different directions, which causes a different pressure build-up in the different directions. A method for manufacturing the tooling. The tooling may be used in electromagnetic welding of two contacted surfaces of molded parts by moving a joining inductor along the contacted surfaces, generating an electromagnetic field in an induction-sensitive component of the molded parts to heat a thermally activated coupling means of the molded parts to above a melting temperature of the coupling means.

IPC Classes  ?

• B29C 65/78 - Means for handling the parts to be joined, e.g. for making containers or hollow articles
• B29C 39/02 - Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressureApparatus therefor for making articles of definite length, i.e. discrete articles
• B29C 65/32 - Induction
• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B29C 65/00 - Joining of preformed partsApparatus therefor
• B33Y 80/00 - Products made by additive manufacturing
• B29K 21/00 - Use of unspecified rubbers as moulding material
• B29L 31/00 - Other particular articles

Abstract

A fiber-reinforced composite laminate for use in electromagnetic welding of molded parts of said laminates is described. The laminate has a plurality of structural layers, each formed of electrically conductive fibers embedded in a thermoplastic matrix, wherein eddy currents may be induced in the electrically conductive fibers by an electrical conductor that generates an electromagnetic field. The structural layers comprise a first, a second and, optionally, a third pair of two adjacently positioned structural layers. The first pair has an intermediate layer between its structural layers which substantially allows eddy currents to flow between the two structural layers of the first pair. The second pair has an intermediate layer between its structural layers which substantially prevents eddy currents from flowing between the two structural layers of the second pair. The optional third pair does not have an intermediate layer in between the two structural layers of the pair. The laminate shows efficient heating by an electromagnetic field.

IPC Classes  ?

• B29C 65/14 - Joining of preformed partsApparatus therefor by heating, with or without pressure using wave energy or particle radiation
• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B32B 37/06 - Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method

Abstract

A fiber-reinforced composite laminate for use in electromagnetic welding of molded parts of said laminates is described. The laminate has a plurality of structural layers, each formed of electrically conductive fibers embedded in a thermoplastic matrix, wherein eddy currents may be induced in the electrically conductive fibers by an electrical conductor that generates an electromagnetic field. The structural layers comprise a first, a second and, optionally, a third pair of two adjacently positioned structural layers. The first pair has an intermediate layer between its structural layers which substantially allows eddy currents to flow between the two structural layers of the first pair. The second pair has an intermediate layer between its structural layers which substantially prevents eddy currents from flowing between the two structural layers of the second pair. The optional third pair does not have an intermediate layer in between the two structural layers of the pair. The laminate shows efficient heating by an electromagnetic field.

IPC Classes  ?

• B29C 65/14 - Joining of preformed partsApparatus therefor by heating, with or without pressure using wave energy or particle radiation
• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B32B 37/06 - Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method

Abstract

A method for joining moulded parts by electromagnetic welding. A joining inductor is moved along contact surfaces of the moulded parts, generating an electromagnetic field in an induction-sensitive component of the moulded part(s) to heat a thermally activated coupling means of the moulded part(s) to above a melting temperature of the coupling means. The strength of the electromagnetic field suitable for joining is determined by previously moving a sensing inductor along the contact plane, generating a relatively weak electromagnetic field to slightly heat the thermally activated coupling means to a sensing temperature, measuring the field strength generated by the sensing inductor in the moulded part(s), determining a discrepancy between the measured field strength of the sensing inductor and the field strength suitable for joining, and adjusting the field strength suitable for joining to close the discrepancy. A device for carrying out the method.

IPC Classes  ?

• B29C 65/00 - Joining of preformed partsApparatus therefor
• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction

Abstract

A fuselage structure of an aircraft is described. The fuselage structure comprises a fuselage skin, and a plurality of frame elements (30), spaced apart from one another in a direction parallel to the aircraft longitudinal axis for supporting the fuselage skin. The fuselage skin is composed of a plurality of interconnected fiber-reinforced composite skin panels (6) that extend between each pair of frame elements and are connected thereto. The composite skin panels further comprise a stiffener (66) integrally formed in each composite skin panel. Also described is a method for manufacturing the fuselage skin. The composite skin panels may be interconnected and/or connected to a frame element through an induction welded connection.

IPC Classes  ?

• B64C 1/06 - FramesStringersLongerons
• B64C 1/12 - Construction or attachment of skin panels
• B64F 5/10 - Manufacturing or assembling aircraft, e.g. jigs therefor

Abstract

A fuselage structure of an aircraft is described. The fuselage structure comprises a fuselage skin, and a plurality of frame elements (30), spaced apart from one another in a direction parallel to the aircraft longitudinal axis for supporting the fuselage skin. The fuselage skin is composed of a plurality of interconnected fiber-reinforced composite skin panels (6) that extend between each pair of frame elements and are connected thereto. The composite skin panels further comprise a stiffener (66) integrally formed in each composite skin panel. Also described is a method for manufacturing the fuselage skin. The composite skin panels may be interconnected and/or connected to a frame element through an induction welded connection.

IPC Classes  ?

• B64C 1/06 - FramesStringersLongerons
• B64C 1/12 - Construction or attachment of skin panels
• B64C 1/00 - FuselagesConstructional features common to fuselages, wings, stabilising surfaces or the like

Abstract

A composite fibrous susceptor for use in induction welding is described, along with methods of its construction and use. The composite fibrous susceptor can include a magnetically susceptible continuous fiber in conjunction with a thermoplastic polymer. The composite fibrous susceptor can be deposited according to an additive manufacturing process on a surface to be bonded according to an induction welding process.

IPC Classes  ?

• H01F 1/00 - Magnets or magnetic bodies characterised by the magnetic materials thereforSelection of materials for their magnetic properties
• F16B 5/08 - Joining sheets or plates to one another or to strips or bars parallel to them by means of welds or the like
• H05B 6/02 - Induction heating
• H05B 6/10 - Induction heating apparatus, other than furnaces, for specific applications
• B32B 5/00 - Layered products characterised by the non-homogeneity or physical structure of a layer
• D01F 8/18 - Conjugated, i.e. bi- or multicomponent, man-made filaments or the likeManufacture thereof from other substances

Abstract

A tooling for use in a method for electromagnetic welding of two contacted surfaces of molded parts is described. The tooling comprises a rubber body and pressurizing means for pressurizing the rubber body and applying pressure to the contacted surfaces. The rubber body comprises an embedded stiff body shaped such as to define different rubber body thicknesses in different directions, which causes a different pressure build-up in said different directions. Also described is a method for manufacturing the tooling. The tooling may be used in electromagnetic welding of two contacted surfaces of molded parts by moving a joining inductor along the contacted surfaces, generating an electromagnetic field in an induction-sensitive component of the molded parts to heat a thermally activated coupling means of the molded parts to above a melting temperature of the coupling means.

IPC Classes  ?

• B29C 65/00 - Joining of preformed partsApparatus therefor
• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B29C 65/78 - Means for handling the parts to be joined, e.g. for making containers or hollow articles
• B29C 65/48 - Joining of preformed partsApparatus therefor using adhesives

Abstract

A tooling for use in a method for electromagnetic welding of two contacted surfaces of molded parts is described. The tooling comprises a rubber body and pressurizing means for pressurizing the rubber body and applying pressure to the contacted surfaces. The rubber body comprises an embedded stiff body shaped such as to define different rubber body thicknesses in different directions, which causes a different pressure build-up in said different directions. Also described is a method for manufacturing the tooling. The tooling may be used in electromagnetic welding of two contacted surfaces of molded parts by moving a joining inductor along the contacted surfaces, generating an electromagnetic field in an induction-sensitive component of the molded parts to heat a thermally activated coupling means of the molded parts to above a melting temperature of the coupling means.

IPC Classes  ?

• B29C 65/00 - Joining of preformed partsApparatus therefor
• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B29C 65/48 - Joining of preformed partsApparatus therefor using adhesives
• B29C 65/78 - Means for handling the parts to be joined, e.g. for making containers or hollow articles

Abstract

A method for joining moulded parts by electromagnetic welding is described. A joining inductor is moved along contact surfaces of the moulded parts, generating an electromagnetic field in an induction-sensitive component of the moulded part(s) to heat a thermally activated coupling means of the moulded part(s) to above a melting temperature of the coupling means. The strength of the electromagnetic field suitable for joining is determined by previously moving a sensing inductor along the contact plane, generating a relatively weak electromagnetic field to slightly heat the thermally activated coupling means to a sensing temperature, measuring the field strength generated by the sensing inductor in the moulded part(s), determining a discrepancy between the measured field strength of the sensing inductor and the field strength suitable for joining, and adjusting the field strength suitable for joining to close the discrepancy. A device for carrying out the method is also described.

IPC Classes  ?

• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B29C 65/48 - Joining of preformed partsApparatus therefor using adhesives

Abstract

A method for joining moulded parts by electromagnetic welding is described. A joining inductor is moved along contact surfaces of the moulded parts, generating an electromagnetic field in an induction-sensitive component of the moulded part(s) to heat a thermally activated coupling means of the moulded part(s) to above a melting temperature of the coupling means. The strength of the electromagnetic field suitable for joining is determined by previously moving a sensing inductor along the contact plane, generating a relatively weak electromagnetic field to slightly heat the thermally activated coupling means to a sensing temperature, measuring the field strength generated by the sensing inductor in the moulded part(s), determining a discrepancy between the measured field strength of the sensing inductor and the field strength suitable for joining, and adjusting the field strength suitable for joining to close the discrepancy. A device for carrying out the method is also described.

IPC Classes  ?

• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• B29C 65/48 - Joining of preformed partsApparatus therefor using adhesives

Abstract

A method for electromagnetic welding of molded parts wherein a mold and at least two molded parts for coupling are placed in the mold, wherein at least a contact surface between the molded parts comprises a thermally activiated coupling means and an induction-senstive component. The coupling means is activated by heating the induction-senstive component by means of an inductor. The inductor comprises an electrical conductor which, under alternating voltage, generates an electromagnetic field which is substantially cylindrical in at least a direction of welding. The molded parts are pressed together in the configuration defined by the mold, wherein the molded parts are coupled by the thermally activated coupling means. Also disclosed is an assembly of molded parts, an inductor, an assembly of the inductor with an alternating current generator, and a device for electromagnetic welding.

IPC Classes  ?

• B29C 65/02 - Joining of preformed partsApparatus therefor by heating, with or without pressure

Abstract

The invention relates to a method for electromagnetic welding of moulded parts. In the method a mould is provided, and at least two moulded parts for coupling are placed in the mould, wherein at least a contact surface between the moulded parts comprises a thermally activated coupling means and an induction-sensitive component. The coupling means is activated by heating the induction-sensitive component by means of an inductor. The inductor comprises an electrical conductor which, under alternating voltage, generates an electromagnetic field which is substantially cylindrical in at least a direction of welding. The moulded parts are pressed together in the configuration defined by the mould, wherein the moulded parts are coupled by the thermally activated coupling means. The invention also relates to an assembly of moulded parts obtained in accordance with the method, an inductor for use in the method, an assembly thereof with an alternating current generator, and a device for electromagnetic welding.

IPC Classes  ?

• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• H05B 3/38 - Powder conductors

Abstract

The invention relates to a method for electromagnetic welding of moulded parts. In the method a mould is provided, and at least two moulded parts for coupling are placed in the mould, wherein at least a contact surface between the moulded parts comprises a thermally activated coupling means and an induction-sensitive component. The coupling means is activated by heating the induction-sensitive component by means of an inductor. The inductor comprises an electrical conductor which, under alternating voltage, generates an electromagnetic field which is substantially cylindrical in at least a direction of welding. The moulded parts are pressed together in the configuration defined by the mould, wherein the moulded parts are coupled by the thermally activated coupling means. The invention also relates to an assembly of moulded parts obtained in accordance with the method, an inductor for use in the method, an assembly thereof with an alternating current generator, and a device for electromagnetic welding.

IPC Classes  ?

• B29C 65/36 - Joining of preformed partsApparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
• H05B 3/38 - Powder conductors