WO2009063515A1 - Device for the generation of a temperature-controlled thermal barrier to the magnetic induction poles of a welding head - Google Patents

Device for the generation of a temperature-controlled thermal barrier to the magnetic induction poles of a welding head Download PDF

Info

Publication number
WO2009063515A1
WO2009063515A1 PCT/IT2008/000443 IT2008000443W WO2009063515A1 WO 2009063515 A1 WO2009063515 A1 WO 2009063515A1 IT 2008000443 W IT2008000443 W IT 2008000443W WO 2009063515 A1 WO2009063515 A1 WO 2009063515A1
Authority
WO
WIPO (PCT)
Prior art keywords
induction
welding head
thermal barrier
electrodes
polar
Prior art date
Application number
PCT/IT2008/000443
Other languages
French (fr)
Inventor
Bruno Ceraso
Original Assignee
Cedal Equipment Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cedal Equipment Srl filed Critical Cedal Equipment Srl
Publication of WO2009063515A1 publication Critical patent/WO2009063515A1/en

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/46—Manufacturing multilayer circuits
    • H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
    • H05K3/4638—Aligning and fixing the circuit boards before lamination; Detecting or measuring the misalignment after lamination; Aligning external circuit patterns or via connections relative to internal circuits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0205—Non-consumable electrodes; C-electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3644—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a ribbon, band or strip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3656—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a layer of a multilayer part to be joined, e.g. for joining plastic-metal laminates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3672—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic
    • B29C65/368—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic with a polymer coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72321—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8182—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects
    • B29C66/81821—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects of the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8187—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects
    • B29C66/81871—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the electrical insulating constructional aspects of the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91212—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91655—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the current intensity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements
    • H05B6/365—Coil arrangements using supplementary conductive or ferromagnetic pieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3668—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special induction coils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2305/00—Use of metals, their alloys or their compounds, as reinforcement
    • B29K2305/08—Transition metals
    • B29K2305/10—Copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2309/00—Use of inorganic materials not provided for in groups B29K2303/00 - B29K2307/00, as reinforcement
    • B29K2309/08—Glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B29L2009/003—Layered products comprising a metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3425—Printed circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/06—Lamination
    • H05K2203/065—Binding insulating layers without adhesive, e.g. by local heating or welding, before lamination of the whole PCB
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/10—Using electric, magnetic and electromagnetic fields; Using laser light
    • H05K2203/101—Using electrical induction, e.g. for heating during soldering

Definitions

  • the present invention relates to machinery for induction heating, and more ' precisely to a device for generating a temperature-controlled thermal barrier to the magnetic induction poles of a welding head.
  • the invention will be described with special attention to its application for the local welding of the layers a multilayer printed circuit is composed of, but this should not be understood as a limitation of its application.
  • FIG. 1 a perspective view is shown of a multilayer printed circuit 1 , having for example four layers with a circuit path respectively indicated with the references 2, 4, 6 and 8, and three insulating layers respectively indicated with the references 3, 5 and 7.
  • the latter are constituted of a thermally bonding agent made of fibreglasses impregnated with resin, known as prepreg.
  • the insulating layers alternate with the layers having a circuit path, and all the layers have a rectangular shape and the same size.
  • the first and the last layer of the stack have a circuit path.
  • the circuit path layers 2, 4, 6 and 8 have a perimetric copper-free band 9adjacent to a rectangular copper crown 10, which marks off the circuit path.
  • metal-free respect areas 11 of rectangular shape can be seen, with the exception of two mutually adjacent short circuit windings 12 and 12'.
  • the respect areas 11 with the windings 12 and 12' are located at the same positions in all the layers, forming groups of respect are as and windings superimposed through the multilayer. Each group of superimposed windings makes a heating unit.
  • variable magnetic flux generated induces in the windings 12 and 12' high short circuit currents, which heat the conductors by Joule effectmelting the surrounding prepreg. When the currents cease, the prepreg hardens again and the layers become mutually welded.
  • a machinery for the welding process comprising the following elements: - a structure with at least one induction device 13 endowed with aU-shaped magnetic circuit, composed by a core 14 with an induction winding and two arms 15, whereby at the outer end of each arm 15 a corresponding induction electrode 16, 17 is placed and the two electrodes 16 and 17 being disposed perpendicularly in respect of the multilayer printed circuit 1, placed on a circuit carrier plate (not shown), coaxially one another, and movable in both directions; a device (not shown) for fastening the layers 2, 3, 4, 5, 6, 7, 8 of the multilayer printed circuit 1 to the circuit carrier plate; - a control device (non shown) of the movement of the circuit carrier plate, arranged to locate the groups of respect areas 11 between the pair of induction electrodes 17, 18 of the induction device 13; and a control device (non shown) of each pair of induction electrodes 16, 17, arranged to locate the electrodes in contact with the group of the respect areas 11 and exert a pressure on said
  • the induction winding 13 In operation, the induction winding 13 generates a variable magnetic field (induction flux) within the magnetic circuit 14, 15 and the induction electrodes 16 and 17, and from there it continues inside the air gap where the multilayer 1 to be welded is located.
  • the flux is concatenated with the windings 12, 12' of the heating unit concerned.
  • variable short-circuit currents are formed. These currents are very high and heat the surrounding substrate by Joule effect, partially melting the prepreg substrates at the respect areas. When the magnetic induction ceases, the heated areas cool remaining welded together. Description of the technical problem
  • the purpose of the above shown induction welding is to handle the multilayer during the different stages of operation, without causing a misalignment among the circuit paths which must correspond one another in the different layers. For this reason, the welding operation must uniformly heat the different respect areas stacked inside their own group. It is also important that the temperature at the interface among the different layers is kept under a limit value, in order to avoid burns or the generation of gas bubbles into the prepreg. Unfortunately, these requirements are not guaranteed with the machinery described in figure 1. The reason is due to the different heat conditions to which the most external layers are subjected within the circuit path 2 and 8, in comparison with the remaining layers.
  • the magnetic induction electrodes 17 and 16 which in general are formed of ferrites with a great mass and a certain heat conductivity (approx. a fifth of that of copper), and therefore can rapidly cool the contact surfaces.
  • the intensity of the feeding current of the induction winding must be increased, making consequently uncontrolled harmful temperature increases more likely to occur in the welding areas.
  • the machinery according to the known art lacks completely of a control of the heating temperature of the layers within the welding areas; this is due to the objective difficulty which arises from the measurement of the temperature in areas which can not be reached by any measuring instrument.
  • the feeding time of the induction winding 15 should be increased, but this would reduce the efficiency of the process on an industrial scale, both in terms of costs and time.
  • the drawbacks indicated for the printed circuit multilayers have a wider significance, due to the fact that they could involve also other examples of application of the induction magnetic welding, for the reason that it is generally true that the surface of an object to be heated, brought in contact with a massive graphite electrode, heats much less rapidly that the remaining body. It is also true that the measurement of the temperature would present difficulties similar to those found for the multilayer.
  • the main purpose of the invention is to indicate a welding head which permits to reach an inductive heating condition, uniformly distributed within the thickness of a body to be heated, in particular a multilayer to be welded, with particular care to the surface strictly contacting the induction electrode.
  • the present invention provides a head for induction welding, particularly of multilayer printed circuits , said head comprising: - a structure for housing an induction U-shaped device with polar expansions and an electric induction winding; two induction electrodes, aligned along a same translation axis ' maintaining the contact with the end surface of a respective polar expansion; means for impressing a translation motion to the induction electrodes, said means being controlled for stopping the electrodes in contact with the surface of the object to be heated, exerting a pressure on the surface; whereby the opposite ends of the induction electrodes comprise thermal barrier means fixd to respective polar faces, and each of the thermal barrier means including: a plate-shaped layer made of an electrically and thermally insulating material, one face of the plate-shaped layer being in contact with the polar face of the induction electrode; a metallic laminate, in contact with
  • the numerical value of said predetermined part is calculated by means of a compromise criterion between the value of the thermal power generated by the thermal barrier and the reduction of the flux in the ferrite of the induction electrode, caused by the antagonist effect of the flux generated by the currents induced in the metallic laminate, preferably made of copper.
  • a maximum value of 0.5 has been found to be a good choice for the copper laminate of rectangular shape, with the greater side equal to that of the polar face of the ferrite (and of the plate-shaped layer). In this case, the former induction flux will not be reduced significantly.
  • the rectangular shape of the copper laminate is the easiest to obtain, but nevertheless this choice is not binding, and other forms could be used for this purpose, like for example a square, a circle, a polygon, etc. Further characteristics of the present invention considered as innovative are described in the dependent claims.
  • the head for induction welding comprises also a thermocouple brought in contact with the surface of the metal laminate of at least one of the thermal barrier means, for generating an electric signal for measuring the local temperature to be sent to a control device of the current circulating in the induction circuit.
  • a small lid for closing each thermal barrier device is provided.
  • the support plate of the metal laminate is made of Teflon ®, a material with a low thermal conductivity and resistant to high temperatures without melting.
  • said Teflon® plate is glued to the polar face of the corresponding electric induction electrode, by means of a biadhesive support (band or sheet) electrically insulated and with a low thermal conductivity, normally found in the market.
  • a biadhesive support band or sheet
  • the small lids for closing the thermal barrier devices are made of an electrically and thermally insulating material, preferably also of Teflon®.
  • the thermocouple is of tape or sheet-type, normally found in the market.
  • the head for induction welding is used for manufacturing multilayer printed circuits, where the layers with a circuit path comprise respect areas in perimetric fixed positions, with internal short-circuit metal windings forming a heating element.
  • the alignment axis of the two magnetic induction electrodes is perpendicular to the multilayer printed circuit.
  • thermal barrier the device according to the invention.
  • high short-circuit currents induced by the variable magnetic field generated by the' inductor are flowing in the copper laminate of the thermal barrier, with the same intensity of the currents flowing inside the windings, within the respect areas of the multilayer; these currents heat the thermal barrier of laminate, which transfers the heat towards the most external layer of the multilayer structure, preventing it from a possible cooling;
  • the small Teflon® lid also increases the efficiency of the heat barrier, for the fact that after a short thermal transient, a nearly isothermal state is determined on the two faces of the small lid, without any possibility of heat transfer between the heat barrier and the multilayer (which is therefore heated from the inside, without any heat dispersion to the outside).
  • the heat barrier according to this invention makes a uniform heat transmission for melting the resin, through the thickness of the layers to join, increasing the number of the joinable layers.
  • figure 1 shows an axonometric view of an induction welding head which is part of a machinery made according to the known art for the welding of the layers of a multilayer printed * circuit, an exploded view of which is shown;
  • - figure 2 shows a perspective view of an induction welding head according to the present invention;
  • figure 3 shows a cross-section of the induction welding head of figure 2, taken along a longitudinal symmetry plane; an enlarged view is also shown of a part which represents the cross-section of a device for generating a controlled-temperature heat barrier, which is the core of the present invention;
  • figure 4 shows a bottom view of the heat barrier device of figure 3;
  • - figure 5 shows an exploded partial axonometric view of the end part of an induction electrode of figure 3, completed with the thermal barrier.
  • a head for induction welding 21 is shown, particularly for welding a multilayer printed circuit as of that shown in figure 1.
  • the head has a housing shell 22 of an induction device, made of an U-shaped ferrite magnetic circuit, with a core 23 of polar expansions 23a and 23b and an induction winding 24 with a few turns of a copper wire of an appropriate cross-section.
  • the end faces of the two arms of the U (polar expansions) are in contact with the lateral surface of two induction ferrite parallelepiped electrodes 25 and 26, within their own housings 27 and 28.
  • the electrodes 25 and 26 are aligned along the same axis, with the possibility to translate in both directions.
  • the sliding axis is parallel to the central arm 23 of the U- shaped inductor, and is perpendicular to the surface of a multi-layer (not shown).
  • the end faces of the polar expansions 23a and 23b are in contact with the lateral surface of the electrodes 25 and 26; the contact is sliding, and it is maintained also during the translation of the electrodes, therefore guaranteeing the continuity of the path of the flux lines of the magnetic field.
  • the shells 22, 27 and 28 are made of ErtalonTM, a polyamide material similar to NylonTM which has an optimum combination of properties, such as: mechanical strength, stiffness, hardness, damping, sliding properties, machinability, wear resistance, thermal inertia and electric insulation.
  • the top ends of the induction electrodes 25 and 26 are bound to sliding rods 29 and 30 of two pneumatic actuators 31 and 32, held in position by two groups of squares 33 and 34, firmly secured to the ErtalonTM shells 22, 27 and 28.
  • the pneumatic actuators 31 and 32 permit the gripping of the induction actuators 25 and 26 on the two sides of the multilayer, by applying a certain pressure to the external layers during the welding.
  • the opposed faces of the induction electrodes 25 and 26 are polar expansions which support a small TeflonTM lid respectively 35 and 36, connected by screws. Between each polar face of the ferrites 25 and 26 and the corresponding small lid, a device 37 A, 37B is located, which has been called "thermal barrier" in accordance with its function.
  • the only heat barrier 37A shown enlarged in the ellipse of the figure, comprises a thermocouple 41 from which a flexible flat cable 42 with two conductors directed to a terminal block 43, screwed to the shell 27 of the upper electrode 25.
  • the thermocouple 41 is of the ribbon type, for example TT260J, normally to be found in the market.
  • the length of the flexible board 42 facilitates the translation of said electrode up to the complete elongation of the arm 29 externally of the actuator 31.
  • the heat barrier is made of a laminate formed by a rectangular TeflonTM board 38 and a copper layer 40 fixed to a face of the TeflonTM board.
  • the thickness of the copper layer 40 is of approximately 70 microns, and lids practically the most external half of the board 38 (the drawing is not to scale). The latter has the same shape and the same size of the polar face of the induction electrode 25.
  • a bi-adhesive band/sheet 39, electrically insulating and with a low heat conductivity is glued on one side to the TeflonTM board 38, and on the other side to the polar face of the induction electrode 25.
  • the previously described features of the heat barrier 37A are common to the barrier 37B.
  • the only thermal barrier 37A carries the thermocouple 41, as shown in figure 4 with the thermocouple 41 in contact with the copper layer 40.
  • thermocouple 41 From the thermocouple 41 two conductors 42a and 42b (of the flat cable 42) made of different materials for the generation of an electric potential in the contact point (Seebeck effect), depart.
  • the ferrite 25 upon which the heat barrier 37A is glued, is held within the shell 27, which has four holes for screwing the small lid 35.
  • Figure 5 shows in an exploded view the mutual relations among the various parts around the heat barrier 37 A.
  • the thermocouple 41 is blocked against the copper laminate 40 by fastening the small lid 35, facilitating the thermal contact.
  • the general principle the function of the welding head is based on does not differ from that of the machinery shown in figure 1, as in both cases a variable magnetic field has to be generated, with a high intensity within an air gap.
  • the main use is the welding of the layers of a multi-layer printed circuit, by means of the heating action generated by Joule effect within respective short-circuit windings which capture an inductive flux and are present on some layers.
  • the main difference is the presence of heat barriers on the polar faces of the induction electrodes and of a thermocouple to limit their heating.
  • the ferrites 25 and 26 are no more in direct " contact with the multilayer with the consequence of cooling the same, but rather they are in contact through the heat barriers 37A and 37B and the corresponding small lids 35 and 36 respectively, which prevent the multilayer cooling and improve the uniformity of heating.
  • the induction flux is slightly reduced by the increased thickness of the air gap, due to the presence of the two heat barriers, and for the partially shielding effect of the induced heating currents circulating in the two additional laminates, but considering the high intensity of the induction flux and the small thickness of the heat barriers, it can be plainly stated that such reduction is negligible, while the advantages are clear.
  • the winding 24 (with 27 turns) is like an inductance fed by a voltage of 500 Vsquare wave at 24 kHz industrial frequency of.
  • the current being the integral of the voltage, is a triangular wave generating a time-varying magnetic field.
  • the variable magnetic field hits the copper laminates 40 of the heat barriers 37A and 37B, inducing a variable current equal to the conductivity of the copper multiplied by a voltage proportional to the time derivative of the induction magnetic field.
  • thermocouple 41 The very high conductivity of copper makes the thermal barriers similar to a short-circuit, where the current generated is very high so as to heat the copper in a short time.
  • Teflon plate support 38 consists in creating a thermal insulation in order to prevent the heat dispersion towards the ferrites 25 and 26.
  • the function of the thermocouple 41 is to generate an information signal on the temperature reached inside the thermal barrier towards a control system of the power circuit feeding the induction winding 24 (both not shown in the figure).
  • the control system is configured for: a) feeding the induction windings 24 and sampling the temperature values measured by the thermocouple 41, detecting when a predetermined temperature has been reached; b) maintaining the feeding for a predetermined time; c) interrupting the feeding when the predetermined time has expired; d) restoring the feeding, when the measured temperature drops under the predetermined value; e) repeating the previous cycle to a new welding operation.

Abstract

An induction welding head for welding multilayer printed circuits (PCB) comprises a ferrite induction device with polar U-shaped expansions in sliding contact against two movable induction electrodes of elongated form. The induction electrodes are aligned along the same translation axis and are controlled by pneumatic actuators in order to be positioned against the multilayer exerting a pressure on the contact surface. Each opposed ends of the induction electrodes has a thermal barrier constituted by a small Teflon™ plate with a 70-microns copper layer sticked at one face, and the other face glued by a bi-adhesive tape to the polar face of the induction electrode. The copper layer extends for a part of the end surface of the induction electrode. A ribbon thermocouple is brought in contact with the copper layer of the thermal barrier maintained against it by a small Teflon lid. The thermocouple sends a measurement signal of the temperature reached by the thermal barrier to a controller device of the power circuit feeding the induction winding with 500 V square-wave at 24 kHz (fig. 3).

Description

Device for the generation of a temperature-controlled thermal barrier to the magnetic induction poles of a welding head Field of application of the invention
The present invention relates to machinery for induction heating, and more ' precisely to a device for generating a temperature-controlled thermal barrier to the magnetic induction poles of a welding head. Hereafter, the invention will be described with special attention to its application for the local welding of the layers a multilayer printed circuit is composed of, but this should not be understood as a limitation of its application.
Review of the prior art
Spot inductive welding of the various layers of a multilayer printed circuit, is known from the Spanish patent No. 2190757, which up to now should be considered the nearest known art to the invention to be described. With reference to figure 1 (corresponding to figures 1, 2 and 3 of said document), a perspective view is shown of a multilayer printed circuit 1 , having for example four layers with a circuit path respectively indicated with the references 2, 4, 6 and 8, and three insulating layers respectively indicated with the references 3, 5 and 7. The latter are constituted of a thermally bonding agent made of fibreglasses impregnated with resin, known as prepreg. In the indicated arrangement of the multilayer 1, the insulating layers alternate with the layers having a circuit path, and all the layers have a rectangular shape and the same size. The first and the last layer of the stack have a circuit path. The circuit path layers 2, 4, 6 and 8 have a perimetric copper-free band 9adjacent to a rectangular copper crown 10, which marks off the circuit path. With a regular distribution on the longest sides of the crown 10, metal-free respect areas 11 of rectangular shape can be seen, with the exception of two mutually adjacent short circuit windings 12 and 12'. The respect areas 11 with the windings 12 and 12' are located at the same positions in all the layers, forming groups of respect are as and windings superimposed through the multilayer. Each group of superimposed windings makes a heating unit. An expressly generated variable magnetic flux generated induces in the windings 12 and 12' high short circuit currents, which heat the conductors by Joule effectmelting the surrounding prepreg. When the currents cease, the prepreg hardens again and the layers become mutually welded.
The above mentioned patent claims also a machinery for the welding process, comprising the following elements: - a structure with at least one induction device 13 endowed with aU-shaped magnetic circuit, composed by a core 14 with an induction winding and two arms 15, whereby at the outer end of each arm 15 a corresponding induction electrode 16, 17 is placed and the two electrodes 16 and 17 being disposed perpendicularly in respect of the multilayer printed circuit 1, placed on a circuit carrier plate (not shown), coaxially one another, and movable in both directions; a device (not shown) for fastening the layers 2, 3, 4, 5, 6, 7, 8 of the multilayer printed circuit 1 to the circuit carrier plate; - a control device (non shown) of the movement of the circuit carrier plate, arranged to locate the groups of respect areas 11 between the pair of induction electrodes 17, 18 of the induction device 13; and a control device (non shown) of each pair of induction electrodes 16, 17, arranged to locate the electrodes in contact with the group of the respect areas 11 and exert a pressure on said area.
In operation, the induction winding 13 generates a variable magnetic field (induction flux) within the magnetic circuit 14, 15 and the induction electrodes 16 and 17, and from there it continues inside the air gap where the multilayer 1 to be welded is located. The flux is concatenated with the windings 12, 12' of the heating unit concerned. Inside the windings, variable short-circuit currents are formed. These currents are very high and heat the surrounding substrate by Joule effect, partially melting the prepreg substrates at the respect areas. When the magnetic induction ceases, the heated areas cool remaining welded together. Description of the technical problem
The purpose of the above shown induction welding is to handle the multilayer during the different stages of operation, without causing a misalignment among the circuit paths which must correspond one another in the different layers. For this reason, the welding operation must uniformly heat the different respect areas stacked inside their own group. It is also important that the temperature at the interface among the different layers is kept under a limit value, in order to avoid burns or the generation of gas bubbles into the prepreg. Unfortunately, these requirements are not guaranteed with the machinery described in figure 1. The reason is due to the different heat conditions to which the most external layers are subjected within the circuit path 2 and 8, in comparison with the remaining layers. They are placed directly in contact with the magnetic induction electrodes 17 and 16, which in general are formed of ferrites with a great mass and a certain heat conductivity (approx. a fifth of that of copper), and therefore can rapidly cool the contact surfaces. To compensate for the differential cooling of the external layers, the intensity of the feeding current of the induction winding must be increased, making consequently uncontrolled harmful temperature increases more likely to occur in the welding areas. The machinery according to the known art lacks completely of a control of the heating temperature of the layers within the welding areas; this is due to the objective difficulty which arises from the measurement of the temperature in areas which can not be reached by any measuring instrument. In order to avoid an increase of the value of the current, the feeding time of the induction winding 15 should be increased, but this would reduce the efficiency of the process on an industrial scale, both in terms of costs and time.
The drawbacks indicated for the printed circuit multilayers have a wider significance, due to the fact that they could involve also other examples of application of the induction magnetic welding, for the reason that it is generally true that the surface of an object to be heated, brought in contact with a massive graphite electrode, heats much less rapidly that the remaining body. It is also true that the measurement of the temperature would present difficulties similar to those found for the multilayer. Purposes of the invention The main purpose of the invention is to indicate a welding head which permits to reach an inductive heating condition, uniformly distributed within the thickness of a body to be heated, in particular a multilayer to be welded, with particular care to the surface strictly contacting the induction electrode. Another purpose of the invention is to set an automatic limitation to the maximum value of the heating temperature, directly measurable at the interface by the induction electrode. Summary of the invention To achieve this main purpose, the present invention provides a head for induction welding, particularly of multilayer printed circuits , said head comprising: - a structure for housing an induction U-shaped device with polar expansions and an electric induction winding; two induction electrodes, aligned along a same translation axis ' maintaining the contact with the end surface of a respective polar expansion; means for impressing a translation motion to the induction electrodes, said means being controlled for stopping the electrodes in contact with the surface of the object to be heated, exerting a pressure on the surface; whereby the opposite ends of the induction electrodes comprise thermal barrier means fixd to respective polar faces, and each of the thermal barrier means including: a plate-shaped layer made of an electrically and thermally insulating material, one face of the plate-shaped layer being in contact with the polar face of the induction electrode; a metallic laminate, in contact with the other face of the plate-shaped insulating layer, the metallic laminate being extended for a predetermined part of the surface of said polar face of the induction electrode, as described in claim 1. The numerical value of said predetermined part is calculated by means of a compromise criterion between the value of the thermal power generated by the thermal barrier and the reduction of the flux in the ferrite of the induction electrode, caused by the antagonist effect of the flux generated by the currents induced in the metallic laminate, preferably made of copper. A maximum value of 0.5 has been found to be a good choice for the copper laminate of rectangular shape, with the greater side equal to that of the polar face of the ferrite (and of the plate-shaped layer). In this case, the former induction flux will not be reduced significantly. The rectangular shape of the copper laminate is the easiest to obtain, but nevertheless this choice is not binding, and other forms could be used for this purpose, like for example a square, a circle, a polygon, etc. Further characteristics of the present invention considered as innovative are described in the dependent claims.
According to one further aspect of the invention, the head for induction welding comprises also a thermocouple brought in contact with the surface of the metal laminate of at least one of the thermal barrier means, for generating an electric signal for measuring the local temperature to be sent to a control device of the current circulating in the induction circuit.
According to another aspect of the invention, a small lid for closing each thermal barrier device is provided. Advantageously, in the thermal barrier means the support plate of the metal laminate is made of Teflon ®, a material with a low thermal conductivity and resistant to high temperatures without melting.
Advantageously, said Teflon® plate is glued to the polar face of the corresponding electric induction electrode, by means of a biadhesive support (band or sheet) electrically insulated and with a low thermal conductivity, normally found in the market.
Advantageously, the small lids for closing the thermal barrier devices are made of an electrically and thermally insulating material, preferably also of Teflon®. Advantageously, the thermocouple is of tape or sheet-type, normally found in the market.
Advantageously, the head for induction welding is used for manufacturing multilayer printed circuits, where the layers with a circuit path comprise respect areas in perimetric fixed positions, with internal short-circuit metal windings forming a heating element. In this preferred case of utilization of the invention, the alignment axis of the two magnetic induction electrodes is perpendicular to the multilayer printed circuit.
From the above it can be considered appropriate to have called thermal barrier the device according to the invention. In effect, with particular reference to the use in the manufacturing of the multilayer printed circuits: • high short-circuit currents induced by the variable magnetic field generated by the' inductor are flowing in the copper laminate of the thermal barrier, with the same intensity of the currents flowing inside the windings, within the respect areas of the multilayer; these currents heat the thermal barrier of laminate, which transfers the heat towards the most external layer of the multilayer structure, preventing it from a possible cooling;
• the Teflon ® plate supporting the copper laminate of the heat barrier prevents the heat generated by the latter to disperse in the ferrite, by making a more efficient heating;
• the small Teflon® lid also increases the efficiency of the heat barrier, for the fact that after a short thermal transient, a nearly isothermal state is determined on the two faces of the small lid, without any possibility of heat transfer between the heat barrier and the multilayer (which is therefore heated from the inside, without any heat dispersion to the outside).
Advantages of the invention
In the cases where welding has to be localized in predetermined points of a multilayer printed circuit, the heat barrier according to this invention makes a uniform heat transmission for melting the resin, through the thickness of the layers to join, increasing the number of the joinable layers.
From the prevention of the greater cooling of the two most external layers, it is possible to limit the maximum value of the current, or alternatively to reduce the welding times. In both cases, the efficiency of the manufacturing cycle increases. It is important to note that the above mentioned advantages can be reached by means of a passive device, to be easily produced and at a minimum cost.
The particular position of the thermal barrier makes also possible to control the temperature directly at the interface with the induction electrode. This is undoubtedly an improvement which makes more reliable and less expensive the induction heating. Brief description of the figures
Further purposes and advantages of the present invention will be clarified by the following detailed description of an example of its realization and by the attached drawings provided on a purely explanatory way and not of restrictive nature, wherein: figure 1 shows an axonometric view of an induction welding head which is part of a machinery made according to the known art for the welding of the layers of a multilayer printed* circuit, an exploded view of which is shown; - figure 2 shows a perspective view of an induction welding head according to the present invention; figure 3 shows a cross-section of the induction welding head of figure 2, taken along a longitudinal symmetry plane; an enlarged view is also shown of a part which represents the cross-section of a device for generating a controlled-temperature heat barrier, which is the core of the present invention; figure 4 shows a bottom view of the heat barrier device of figure 3; - figure 5 shows an exploded partial axonometric view of the end part of an induction electrode of figure 3, completed with the thermal barrier.
Detailed description of some preferred embodiments of the invention With reference to figures 2 and 3, a head for induction welding 21 is shown, particularly for welding a multilayer printed circuit as of that shown in figure 1. The head has a housing shell 22 of an induction device, made of an U-shaped ferrite magnetic circuit, with a core 23 of polar expansions 23a and 23b and an induction winding 24 with a few turns of a copper wire of an appropriate cross-section. The end faces of the two arms of the U (polar expansions) are in contact with the lateral surface of two induction ferrite parallelepiped electrodes 25 and 26, within their own housings 27 and 28. The electrodes 25 and 26 are aligned along the same axis, with the possibility to translate in both directions. The sliding axis is parallel to the central arm 23 of the U- shaped inductor, and is perpendicular to the surface of a multi-layer (not shown). The end faces of the polar expansions 23a and 23b are in contact with the lateral surface of the electrodes 25 and 26; the contact is sliding, and it is maintained also during the translation of the electrodes, therefore guaranteeing the continuity of the path of the flux lines of the magnetic field. The shells 22, 27 and 28 are made of Ertalon™, a polyamide material similar to Nylon™ which has an optimum combination of properties, such as: mechanical strength, stiffness, hardness, damping, sliding properties, machinability, wear resistance, thermal inertia and electric insulation. The top ends of the induction electrodes 25 and 26 are bound to sliding rods 29 and 30 of two pneumatic actuators 31 and 32, held in position by two groups of squares 33 and 34, firmly secured to the Ertalon™ shells 22, 27 and 28. The pneumatic actuators 31 and 32 permit the gripping of the induction actuators 25 and 26 on the two sides of the multilayer, by applying a certain pressure to the external layers during the welding. The opposed faces of the induction electrodes 25 and 26 are polar expansions which support a small Teflon™ lid respectively 35 and 36, connected by screws. Between each polar face of the ferrites 25 and 26 and the corresponding small lid, a device 37 A, 37B is located, which has been called "thermal barrier" in accordance with its function. The only heat barrier 37A shown enlarged in the ellipse of the figure, comprises a thermocouple 41 from which a flexible flat cable 42 with two conductors directed to a terminal block 43, screwed to the shell 27 of the upper electrode 25. The thermocouple 41 is of the ribbon type, for example TT260J, normally to be found in the market. The length of the flexible board 42 facilitates the translation of said electrode up to the complete elongation of the arm 29 externally of the actuator 31. In the enlarged view, it can be appreciated that the heat barrier is made of a laminate formed by a rectangular Teflon™ board 38 and a copper layer 40 fixed to a face of the Teflon™ board. The thickness of the copper layer 40 is of approximately 70 microns, and lids practically the most external half of the board 38 (the drawing is not to scale). The latter has the same shape and the same size of the polar face of the induction electrode 25. A bi-adhesive band/sheet 39, electrically insulating and with a low heat conductivity is glued on one side to the Teflon™ board 38, and on the other side to the polar face of the induction electrode 25. The previously described features of the heat barrier 37A are common to the barrier 37B. The only thermal barrier 37A carries the thermocouple 41, as shown in figure 4 with the thermocouple 41 in contact with the copper layer 40. From the thermocouple 41 two conductors 42a and 42b (of the flat cable 42) made of different materials for the generation of an electric potential in the contact point (Seebeck effect), depart. The ferrite 25 upon which the heat barrier 37A is glued, is held within the shell 27, which has four holes for screwing the small lid 35. Figure 5 shows in an exploded view the mutual relations among the various parts around the heat barrier 37 A. As it can be noticed, the thermocouple 41 is blocked against the copper laminate 40 by fastening the small lid 35, facilitating the thermal contact.
The general principle the function of the welding head is based on, does not differ from that of the machinery shown in figure 1, as in both cases a variable magnetic field has to be generated, with a high intensity within an air gap. In both cases, the main use is the welding of the layers of a multi-layer printed circuit, by means of the heating action generated by Joule effect within respective short-circuit windings which capture an inductive flux and are present on some layers. The main difference is the presence of heat barriers on the polar faces of the induction electrodes and of a thermocouple to limit their heating. The advantages of integrating in the welding head the two heat barriers have already been widely explained in the preamble, to which reference is made. In the proposed solution, the ferrites 25 and 26 are no more in direct" contact with the multilayer with the consequence of cooling the same, but rather they are in contact through the heat barriers 37A and 37B and the corresponding small lids 35 and 36 respectively, which prevent the multilayer cooling and improve the uniformity of heating. In respect of the machinery shown in figure 1, the induction flux is slightly reduced by the increased thickness of the air gap, due to the presence of the two heat barriers, and for the partially shielding effect of the induced heating currents circulating in the two additional laminates, but considering the high intensity of the induction flux and the small thickness of the heat barriers, it can be plainly stated that such reduction is negligible, while the advantages are clear. For a more detailed description of the function, the winding 24 (with 27 turns) is like an inductance fed by a voltage of 500 Vsquare wave at 24 kHz industrial frequency of. The current, being the integral of the voltage, is a triangular wave generating a time-varying magnetic field., The flux lines of the magnetic field due to the magnetic permeability of the ferrite much higher than that of air, have a preferential pattern along the ferrites 23, 23a, 23b, 25 and 26. The variable magnetic field hits the copper laminates 40 of the heat barriers 37A and 37B, inducing a variable current equal to the conductivity of the copper multiplied by a voltage proportional to the time derivative of the induction magnetic field. The very high conductivity of copper makes the thermal barriers similar to a short-circuit, where the current generated is very high so as to heat the copper in a short time. Conversely, the function of Teflon plate support 38 consists in creating a thermal insulation in order to prevent the heat dispersion towards the ferrites 25 and 26. The function of the thermocouple 41 is to generate an information signal on the temperature reached inside the thermal barrier towards a control system of the power circuit feeding the induction winding 24 (both not shown in the figure). The control system is configured for: a) feeding the induction windings 24 and sampling the temperature values measured by the thermocouple 41, detecting when a predetermined temperature has been reached; b) maintaining the feeding for a predetermined time; c) interrupting the feeding when the predetermined time has expired; d) restoring the feeding, when the measured temperature drops under the predetermined value; e) repeating the previous cycle to a new welding operation.
In this way, burning effects inside the heat barrier are avoided in the single welding operation of the multilayer.
From the here given description of a preferred form of execution of the invention, it is clear that changes can be made by an expert in the field without thereby departing from the following claims.

Claims

CLAMS
1. Induction welding head (21) for welding multilayer printed circuits (1), comprising: a structure (22. 27, 28) for housing an induction U-shaped device (23, 23a, 23b) with polar expansions (23a, 23b) and an induction electric winding (24); two induction electrodes (25, 26) aligned along a same translation axis maintaining the contact with the end surface of a respective polar expansion (23a, 23b); - means (31., 29, 32, 30) for impressing a translation motion to the induction electrodes (25, 26), said means being controlled for stopping the electrodes in contact with the surface of the object to be heated (1) exerting a pressure on the surface, characterized in that the opposite ends of the induction electrodes (25, 26) comprise thermal barrier means (37A, 37B) fixed to respective polar faces, and each of the thermal barrier means including: - a plate-shaped layer (38) made of an electrically and thermally insulating material, one face of the plate-shaped layer being in contact with the polar face of the induction electrode (25, 26); - a metallic laminate (40) in contact with the other face of the plate-shaped insulating layer (38), the metallic laminate being extended for a predetermined part of the surface of said polar face of the induction electrode (25, 26).
2. The induction welding head as in claim 1, wherein the numerical value of said predetermined part is calculated with a compromise criterion between the value of the thermal power generated by said thermal barrier means (37 A, 37B) and the reduction of the flux of the magnetic field within the induction electrode (25, 26), caused by the antagonist effect of the flux generated by the currents induced in that metallic laminate (40).
3. The induction welding head as in claim 2, wherein the upper limit of said compromise numerical value is 0.5 for a copper laminate' (40) of rectangular shape with the longer side equal to that of said polar face.
4. The induction welding head as in any one of claims 1 to 3, wherein a bi-adhesive layer (39) shaped as a tape or a sheet electrically insulating and with poor thermal conductivity, is interposed between said insulating plate-shaped layer (38) and said polar face of the induction electrode (25, 26).
5. The induction welding head as in any one of claims 1 to 4, wherein each of the thermal barrier means (37A, 37B) has a lid (35, 36) made of a thermally and electrically insulating material, the lids being fastened to the housing structure (27, 28) of respective induction electrodes (25, 26).
6. The induction welding head as in claim 5, wherein at least one of the thermal barrier means (37A) includes a thermocouple (41) brought in contact with said metallic laminate (40) for generating an electric signal measuring the local temperature towards a control device of the current circulating in the induction electric winding (24).
7. The induction welding head as in any one of claims 1 to 6, wherein said insulating plate-shaped layer (38) is made of Teflon™.
8. The induction welding head as in any one of claims 5 to 7, wherein said lids (35, 36) are made of Teflon™.
9. The induction welding head as in any one of claims 1 to 8, wherein it includes feeding means of said induction winding (24) arranged to generate a voltage with a square wave at industrial frequency.
10. The induction welding head as in claim 9, wherein it includes control means of said feeding means configured for: a) feeding the induction winding (24) and sampling the temperature values measured by the thermocouple (41) for detecting the reaching of a predetermined temperature; b) maintaining the feeding for a predetermined time; c) interrupting the feeding when said predetermined time is expired; d) restoring the feeding when the measured temperature falls under the predetermined value; e) repeating the previous steps for a new welding operation.
PCT/IT2008/000443 2007-11-12 2008-06-30 Device for the generation of a temperature-controlled thermal barrier to the magnetic induction poles of a welding head WO2009063515A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2007A002150 2007-11-12
IT002150A ITMI20072150A1 (en) 2007-11-12 2007-11-12 DEVICE FOR THE GENERATION OF A THERMAL BARRIER WITH A TEMPERATURE CONTROLLED BY THE MAGNETIC INDUCTION POLES OF A WELDING HEAD

Publications (1)

Publication Number Publication Date
WO2009063515A1 true WO2009063515A1 (en) 2009-05-22

Family

ID=40042586

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2008/000443 WO2009063515A1 (en) 2007-11-12 2008-06-30 Device for the generation of a temperature-controlled thermal barrier to the magnetic induction poles of a welding head

Country Status (3)

Country Link
IT (1) ITMI20072150A1 (en)
TW (1) TW200922431A (en)
WO (1) WO2009063515A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITGE20100116A1 (en) * 2010-10-19 2012-04-20 Cedal Equipment S R L "METHOD AND EQUIPMENT FOR THE WELDING OF PRINTED CIRCUITS"
EP2468480A1 (en) * 2010-12-23 2012-06-27 Tetra Laval Holdings & Finance S.A. Induction sealing device for heat sealing packaging material for producing sealed packages of pourable food products
EP2693853A1 (en) * 2012-08-02 2014-02-05 Chemplate Materials, S.L. Tool, method and machine for manufacturing multilayer printed circuit boards
ITGE20130058A1 (en) * 2013-06-13 2014-12-14 Cedal Equipment S R L MINIATURE HEAD OF JUNCTION WITH INDUCTION OF PRINTED CIRCUITS
WO2017162473A1 (en) * 2016-03-23 2017-09-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Device and method for producing or for interrupting a connection between at least one metal or ceramic component and a component formed from or with a thermoplastic polymer
US9972762B2 (en) 2012-08-31 2018-05-15 Te Wire & Cable Llc Thermocouple ribbon and assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103210706A (en) * 2010-10-19 2013-07-17 塞逹尔设备股份有限公司 Method and apparatus for welding printed circuits
CN103906284A (en) * 2014-04-22 2014-07-02 王斯光 High frequency electromagnetic fusion positioning device for multi-layer printed circuit board

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5139407A (en) * 1989-09-01 1992-08-18 General Electric Company Apparatus for reducing thermoplastic material compression mold cycle time
US5483043A (en) * 1993-11-29 1996-01-09 General Electric Company Induction heating of polymer matrix composites in a mold press
US20030062118A1 (en) * 2001-09-25 2003-04-03 Gerhard Jack K. Apparatus and method for induction lamination of electrically conductive fiber reinforced composite materials
EP1460890A1 (en) * 2001-12-28 2004-09-22 Chemplate Materials, S.L. Method of soldering the constituent layers of a multilayer printed circuit and the machine used for same
US20070045296A1 (en) * 2003-05-30 2007-03-01 Gallego Victor L Electrode for machines for electromagnetic induction welding of the layers forming a multi-layer printed circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5139407A (en) * 1989-09-01 1992-08-18 General Electric Company Apparatus for reducing thermoplastic material compression mold cycle time
US5483043A (en) * 1993-11-29 1996-01-09 General Electric Company Induction heating of polymer matrix composites in a mold press
US20030062118A1 (en) * 2001-09-25 2003-04-03 Gerhard Jack K. Apparatus and method for induction lamination of electrically conductive fiber reinforced composite materials
EP1460890A1 (en) * 2001-12-28 2004-09-22 Chemplate Materials, S.L. Method of soldering the constituent layers of a multilayer printed circuit and the machine used for same
US20070045296A1 (en) * 2003-05-30 2007-03-01 Gallego Victor L Electrode for machines for electromagnetic induction welding of the layers forming a multi-layer printed circuit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Appts. for induction heating - contains conductor of one of phases connected in opposite direction to adjacent conductors of two remaining phases", DERWENT,, 1 January 1900 (1900-01-01), XP002290688 *

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITGE20100116A1 (en) * 2010-10-19 2012-04-20 Cedal Equipment S R L "METHOD AND EQUIPMENT FOR THE WELDING OF PRINTED CIRCUITS"
WO2012052877A2 (en) * 2010-10-19 2012-04-26 Cedal Equipment S.R.L. Method and apparatus for welding printed circuits
WO2012052877A3 (en) * 2010-10-19 2012-10-04 Cedal Equipment S.R.L. Method and apparatus for welding printed circuits
US9603264B2 (en) 2010-10-19 2017-03-21 Cedal Equipment S.R.L. Method and apparatus for welding printed circuits
EP2468480A1 (en) * 2010-12-23 2012-06-27 Tetra Laval Holdings & Finance S.A. Induction sealing device for heat sealing packaging material for producing sealed packages of pourable food products
WO2012084510A1 (en) * 2010-12-23 2012-06-28 Tetra Laval Holdings & Finance S.A. Induction sealing device for heat sealing packaging material for producing sealed packages of pourable food products
CN103260856A (en) * 2010-12-23 2013-08-21 利乐拉瓦尔集团及财务有限公司 Induction sealing device for heat sealing packaging material for producing sealed packages of pourable food products
US9352869B2 (en) 2010-12-23 2016-05-31 Tetra Laval Holdings & Finance S.A. Folding unit for forming sealed packages of pourable food products
CN104509223A (en) * 2012-08-02 2015-04-08 彻姆普拉特原料公司 Tool, method and machine for manufacturing multi-layer printed circuit boards
WO2014020206A1 (en) * 2012-08-02 2014-02-06 Chemplate Materials, S.L. Tool, method and machine for manufacturing multi-layer printed circuit boards
EP2693853A1 (en) * 2012-08-02 2014-02-05 Chemplate Materials, S.L. Tool, method and machine for manufacturing multilayer printed circuit boards
US9826644B2 (en) 2012-08-02 2017-11-21 Chemplate Materials, S.L. Tool, method and machine for manufacturing multi-layer printed circuit boards
US9972762B2 (en) 2012-08-31 2018-05-15 Te Wire & Cable Llc Thermocouple ribbon and assembly
US10396266B2 (en) 2012-08-31 2019-08-27 Te Wire & Cable Llc Thermocouple ribbon and assembly
WO2014199251A1 (en) * 2013-06-13 2014-12-18 Cedal Equipment S.R.L. Miniaturized head for induction welding of printed circuits
ITGE20130058A1 (en) * 2013-06-13 2014-12-14 Cedal Equipment S R L MINIATURE HEAD OF JUNCTION WITH INDUCTION OF PRINTED CIRCUITS
CN105379414A (en) * 2013-06-13 2016-03-02 塞德尔设备责任有限公司 Miniaturized head for induction welding of printed circuits
CN105379414B (en) * 2013-06-13 2019-07-26 塞德尔设备责任有限公司 Small-sized soldering tip for printed circuit induction welding
WO2017162473A1 (en) * 2016-03-23 2017-09-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Device and method for producing or for interrupting a connection between at least one metal or ceramic component and a component formed from or with a thermoplastic polymer
DE102016204797B4 (en) 2016-03-23 2021-12-09 Technische Universität Dresden Device and method for producing or separating a cohesive or cohesive and form-fitting connection of at least one metallic or ceramic component and a component formed from or with a thermoplastic polymer
US11660824B2 (en) 2016-03-23 2023-05-30 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. Apparatus and method for establishing or for separating a connection having material continuity or having material continuity and shape matching of at least one metal or ceramic component and of a component formed from or by a thermoplastic polymer

Also Published As

Publication number Publication date
TW200922431A (en) 2009-05-16
ITMI20072150A1 (en) 2009-05-13

Similar Documents

Publication Publication Date Title
WO2009063515A1 (en) Device for the generation of a temperature-controlled thermal barrier to the magnetic induction poles of a welding head
KR101417791B1 (en) Welding transformer, welding transformer assembly, and welding device
EP2959746B1 (en) Induction heating head
US10361019B2 (en) Moisture resistant layered sleeve heater and method of manufacture thereof
WO2012073517A1 (en) Induction heating coil and induction heating device
JPS61292808A (en) Self-heating/self-solder welding bath bar
WO2008028005A2 (en) Bond head assembly and system
US20170213635A1 (en) Electrical Device, in Particular a Coil or a Transformer
JP4286284B2 (en) Electrodes for electromagnetic induction welding of layers forming multilayer printed circuits
JPH08293668A (en) Soldering of electronic components onto printed board
JP2023532479A (en) Transverse flux induction heating device for heating flat products
JP6816874B2 (en) Protective element
JP2913615B2 (en) Insulating member and high-frequency heating device using the same
TWI606751B (en) Miniaturized head for induction welding of printed circuits
KR101187323B1 (en) Water-cooling transformer for high frequency induction heating welder and manufacturing method thereof
EP2630848A2 (en) Method and apparatus for welding printed circuits
JP2012243903A (en) Soldering method and device of electronic component
JP2005151668A (en) Apparatus and method for manufacturing stator
JP4848792B2 (en) Induction heating device
TWI294929B (en) Inductor core for heatable godet roll, inductor for heatable godet roll, and heatable godet roll
JP2014216129A (en) Induction heating device and induction heating apparatus using the same
JP2530509Y2 (en) High frequency heating coil
JP2021093421A (en) Superconducting coil device
JP2016524810A (en) Current limiter superconducting current limiter and method of fabricating current limiter superconducting current limiter
JP5247103B2 (en) Induction heating coil and heat treatment method

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08790032

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08790032

Country of ref document: EP

Kind code of ref document: A1