EP2531343A1 - Ultraschallschweissgerät, im besonderen zum schweissen eines stapels aus zelllagen - Google Patents

Ultraschallschweissgerät, im besonderen zum schweissen eines stapels aus zelllagen

Info

Publication number
EP2531343A1
EP2531343A1 EP11707446A EP11707446A EP2531343A1 EP 2531343 A1 EP2531343 A1 EP 2531343A1 EP 11707446 A EP11707446 A EP 11707446A EP 11707446 A EP11707446 A EP 11707446A EP 2531343 A1 EP2531343 A1 EP 2531343A1
Authority
EP
European Patent Office
Prior art keywords
sonotrode
support
elements
stack
welding
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP11707446A
Other languages
English (en)
French (fr)
Inventor
Yves Bezault
Claude Martin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hamon Thermal Europe France SA
Original Assignee
Hamon Thermal Europe France SA
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 Hamon Thermal Europe France SA filed Critical Hamon Thermal Europe France SA
Publication of EP2531343A1 publication Critical patent/EP2531343A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/438—Joining sheets for making hollow-walled, channelled structures or multi-tubular 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
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29C66/01—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
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B29C66/1312—Single flange to flange joints, the parts to be joined being rigid
    • 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
    • B29C66/73—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—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 intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • 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
    • 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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/922—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9221—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force or the mechanical power
    • 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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9261—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools
    • B29C66/92611—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the displacement of the joining tools by controlling or regulating the gap between 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
    • B29C66/96—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
    • 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
    • B29C66/71—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 composition of the plastics material of 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
    • B29C66/80—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
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9241—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power
    • B29C66/92451—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power using joining tools having different pressure zones or using several joining tools with different pressures
    • 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
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/951—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools
    • B29C66/9513—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools characterised by specific vibration frequency values or ranges
    • 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
    • B29L2031/18—Heat-exchangers or parts thereof
    • 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
    • B29L2031/60—Multitubular or multicompartmented articles, e.g. honeycomb
    • B29L2031/608—Honeycomb structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0037—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the conduits for the other heat-exchange medium also being formed by paired plates touching each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
    • F28F21/065—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing plate-like or laminated conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/06—Fastening; Joining by welding
    • F28F2275/065—Fastening; Joining by welding by ultrasonic or vibration welding

Definitions

  • Ultrasonic welding device in particular for welding a stack of honeycomb sheets
  • the present invention relates to a device for ultrasonic welding of at least two thermoplastic elements.
  • the ultrasonic welding consists in sending high frequency vibrations to two stacked elements to be welded, by means of a vibrating tool, called sonotrode.
  • the welding is done thanks to the heat generated by the vibrations at the interface between the two elements.
  • thermoplastic elements of the type comprising:
  • At least one sonotrode At least one sonotrode
  • a force measurement sensor capable of measuring the force applied by the elements to be welded on the sonotrode
  • the support has an anvil function, that is to say that the support forms a tool for taking up the force applied by the sonotrode on the elements to be welded, so that these elements to be welded are firmly pressed against each other during welding.
  • the elements to be welded are pinched between the sonotrode and the anvil in each welding zone.
  • the force measurement sensor is intended to verify that the compression force of the elements to be welded against each other, applied between the sonotrode and the anvil, is constant during welding, to ensure a homogeneous weld.
  • Such a stack is for example used in a heat exchanger, in particular for a thermal or nuclear power plant, in which water is brought into direct contact with the air passing through the stack of honeycomb sheets, in order to carry out a transfer. heat.
  • two adjacent honeycomb sheets are in contact only in generally flat areas formed between these cells. Thus, the connection between these sheets can be achieved only in these contact areas. It will be noted that the contact zones of two adjacent sheets are generally opposite cells of a third sheet. Thus, for a stack of at least three honeycomb sheets, it is not possible to firmly hold the contact areas of two adjacent sheets between an anvil and a sonotrode. In particular, it is not possible to introduce the anvil into the stack so that these contact areas rest on this anvil.
  • the invention aims in particular to overcome this drawback by providing an ultrasonic welding device capable of making welds between each sheet of a stack of honeycomb sheets, these welds can be made on the entire surface of each sheet.
  • the subject of the invention is in particular a device for ultrasonic welding of at least two thermoplastic elements, in particular a stack of at least two cellular sheets, of the type comprising:
  • At least one sonotrode At least one sonotrode
  • a force measurement sensor capable of measuring the force applied by the elements to be welded on the sonotrode
  • the displacement means are adapted to move the support and the sonotrode towards each other until the force measured by the sensor reaches a predetermined non-zero adjustable value
  • the welding device further comprising means for activating the sonotrode, suitable for keeping the sonotrode inactive as long as the force measured by the sensor is less than the predetermined value, and for activating the sonotrode when the force measured by the sensor is at least equal to the value predetermined.
  • the invention proposes to provide a welding device to overcome the use of an anvil.
  • the invention proposes to use a force sensor, not to verify that the force is constant during welding, but to condition the completion of the weld.
  • the sonotrode is activated only when the force measured by the sensor is at least equal to the predetermined value.
  • the invention makes it possible to use the inherent stiffness of the stack of honeycomb sheets in place of an anvil. To do this, the support and the sonotrode move towards each other by compressing the stack until the measured force reaches the predetermined value. It is considered that the force applied by the sonotrode on the two upper adjacent sheets of the stack is sufficient to achieve the weld, although these two upper adjacent sheets are not pinched between an anvil and the sonotrode in the area. Welding.
  • the invention makes it possible to perform welds in all the contact zones between the two upper end sheets of the stack, and not only at their periphery, and this without it being necessary to introduce a anvil under these contact areas.
  • a welding device advantageously comprises one or more of the following characteristics, taken alone or in any technically possible combination.
  • the sonotrode is arranged vertically above the support, the support having a vertically movable plate relative to the sonotrode, for receiving the elements to be welded.
  • the sonotrode is likely to be driven in motion along a path limited by the elements to be welded, when these elements to be welded are moved by the support to the sonotrode.
  • the force measurement sensor comprises a photocell, intended to measure the movement of the sonotrode when it is driven in motion, the value of the force being deduced from the measured displacement.
  • the photocell defines a threshold for the displacement of the sonotrode, from which the displacement means stop moving the support, and the activation means activate the sonotrode.
  • the welding device comprises peripheral stiffening elements of the stack of elements to be welded, intended to be inserted under a peripheral rim of an upper element of the stack, so as to support the peripheral rim.
  • the welding device comprises a plurality of sonotrodes, at least one sonotrode is connected to the measuring sensor, the activation means being common to at least two sonotrodes, preferably all sonotrodes.
  • the invention also relates to a process for ultrasonic welding of at least two thermoplastic elements, in particular a stack of at least two cellular sheets, using a welding device according to any one of the following: preceding claims, comprising: a step during which a stack of at least two elements to be welded is arranged on the support,
  • a step subsequent to the relative displacement of the support and the sonotrode, during which the sonotrode is activated when the force measured by the sensor is at least equal to the predetermined value.
  • the invention also relates to the use of a welding device as defined above for the ultrasonic welding of a stack of at least three foils.
  • the invention relates to a stack of at least three honeycomb sheets, each honeycomb sheet delimiting cells with an adjacent honeycomb sheet, wherein at least one cellular sheet has at least one first weld zone with an upper, adjacent honeycomb sheet, and at least one second weld zone with an adjacent lower corrugated sheet, such that each of the first and second weld zones is separated from each peripheral rim of the honeycomb sheet by at least one cell.
  • FIG. 1 is a sectional view of a welding device according to an exemplary embodiment of the invention.
  • FIG. 2 is a sectional view of a welding tool of the device of Figure 1;
  • FIG. 3 is a sectional front view stack of honeycomb sheets.
  • FIG. 1 shows an ultrasonic welding device 10 according to an exemplary embodiment of the invention.
  • the welding device 10 comprises a frame 12 including a set of welding tools 14 and a support 16.
  • the welding tools 14 are arranged vertically above the support 16, vis-à-vis the support 16.
  • the support 16 comprises a mobile plate 18 intended to receive a stack 20 of elements 21 made of thermoplastic material, such as that represented in FIG. 2.
  • the elements 21 are made of polyvinyl chloride (PVC), polypropylene (PP), or acrylonitrile butadiene styrene (ABS).
  • the elements made of thermoplastic material are honeycomb sheets 21, that is to say having a shape such that two adjacent honeycomb sheets delimit between them at least one cell 22.
  • Two adjacent honeycomb sheets 21 also have thin contact zones 23 formed between two cells 22, intended to form weld zones. Indeed, two adjacent honeycomb sheets 21 are in contact only in these contact zones 23. These contact zones 23 are relatively thin, so as to allow the realization of ultrasonic welding in these contact zones 23. Preferably, these contact areas 23 are flat.
  • the movable plate 18 is mounted on displacement means 24, able to move this plate 18 horizontally in first and second directions perpendicular to each other, and vertically in a third direction perpendicular to the first and second directions.
  • the horizontal displacement of the plate 18 makes it possible to align this plate 18 in a desired manner with respect to the welding tools 14, so that each welding tool 14 is arranged facing a contact zone 23 of the two cellular sheets 21 from the top of the stack 20, said honeycombed upper end sheets.
  • each welding tool 14 is arranged facing a contact zone 23 of the two cellular sheets 21 from the top of the stack 20, said honeycombed upper end sheets.
  • the vertical movement meanwhile makes it possible to bring the stack 20 in contact with the welding tools 14, in order to perform the welds in the contact zones 23 of the upper end foamed sheets.
  • the frame 12 comprises a device 25 for feeding the honeycomb sheets 21 onto the plate 18.
  • This feeder 25 can be loaded manually or automatically by means of loading tongs 26.
  • Each welding tool 14, one of them being shown in FIG. 2 comprises a converter 28, intended to convert electrical energy into vibrations, and a sonotrode 30, connected to the converter 28 so as to transmit the generated ultrasound to the elements to be welded.
  • these sonotrodes 30 are adapted to vibrate at a frequency greater than 25 kHz.
  • each sonotrode 30 is capable of being driven vertically, by the stack 20, when this stack 20 is moved by the support 16 towards this sonotrode 30.
  • the welding device 10 comprises least one force measurement sensor 32, connected to one of the sonotrodes 30, so as to measure the force applied by the stack 20 on the sonotrode 30.
  • the predetermined value is the value of the force for which it is considered that this force is sufficient to perform the ultrasonic welding.
  • This predetermined value is non-zero, and preferably adjustable, so that it can be adapted to the material in which the sheets 21 are made.
  • the force measurement sensor 32 is connected to a central sonotrode 30A, as shown in FIG. 2, so that the force measured is that which is applied in a central zone of the stack 20.
  • a "central sonotrode 30A” is a sonotrode which is interposed between at least two adjacent sonotrodes in each of the first and second directions of movement of the plate 18.
  • the force measurement sensor 32 comprises a photocell 33, capable of measuring the displacement of the sonotrode 30 when it is driven in motion.
  • the value of the force applied to the sonotrode 30 is deduced from this measured displacement.
  • the photocell defines a threshold for the displacement of the sonotrode 30, from which it is considered that the applied force reaches the predetermined value.
  • the displacement means 24 of the support 16 are connected to the force sensor 32, so that the displacement of the movable plate 18 towards the sonotrode 30 is interrupted when the force measured by the sensor 32 reaches the predetermined value.
  • the sonotrodes 30 are activated only when the force applied by these sonotrodes 30 on the stack 20 is at least equal to the predetermined value.
  • the welding device 10 comprises means 34 for activating the sonotrodes 30, able to keep the sonotrodes 30 inactive as long as the force measured by the sensor 32 is less than the predetermined value, and to activate the sonotrodes 30 when the the force measured by the sensor 32 is at least equal to the predetermined non-zero value.
  • the activation means 34 are advantageously common to all the sonotrodes 30, so that they are activated simultaneously.
  • a second force sensor (not shown) connected to a peripheral sonotrode.
  • the peripheral sonotrode in opposition to a central sonotrode, is a sonotrode which is not interposed between two adjacent sonotrodes in at least one of the first and second directions of movement of the plate 18.
  • this stack 20 generally has a higher rigidity in its central zone with respect to its zone. peripheral. It may therefore be advantageous to also check that the force of the peripheral sonotrodes on the peripheral zone of the stack is also sufficient to perform an ultrasonic weld.
  • peripheral stiffening elements 36 connected to the frame 12, intended to be inserted under a peripheral rim of the upper end sheet 21 A of the stack 20, so as to support this peripheral rim when the welding.
  • Such peripheral stiffening elements 36 make it possible to stiffen the peripheral zone of the stack 20, so as to homogenize the rigidity of the stack 20.
  • the invention allows stacks 20 of foamed thermoplastic sheets 21 to be made during an ultrasonic welding process which will be described below.
  • a stack 20 of two cellular sheets 21 is placed on the plate 18.
  • the two sheets 21 are brought consecutively on the plate 18 by the delivery device 25.
  • the method then comprises a step of positioning the plate 18 opposite the sonotrodes 30, during which the plate is moved horizontally, in an automated or controlled manner, so as to arrange each welding zone 23 of the sheets 21 opposite a sonotrode 30.
  • this plate 18 is moved vertically towards the sonotrodes 30, until the force measured by the measurement sensor 32 reaches the predetermined value.
  • This measured effort corresponds to the force applied by the sonotrode 30A on the corresponding contact zone 23.
  • the force applied by the sonotrodes 30 on the stack 20 is sufficient to achieve a weld.
  • the contact zones 23 in contact with the sheets 21 to be welded are located away from the plate 18, being spaced from this plate 18 by a non-zero height H.
  • This height H depends on the number of sheets 21 stacked, the height of the cells 22 and the crushing of the stack 20 between the sonotrodes 30 and the plate 18.
  • the plate 18 does not act as an anvil, since the contact zones 23 to be welded are not pinched between the sonotrodes 30 and this plate 18.
  • the method according to the invention provides for using the inherent rigidity stack 20 instead of an anvil. We then go to a welding step, during which the sonotrodes 30 are activated by the activation means 34, since the force measured by the sensor 32 is at least equal to the predetermined value.
  • the tray is lowered.
  • the force measured by the sensor 32 then becomes less than the predetermined value, and the activation means 34 thus deactivate the sonotrodes 30.
  • the plate is returned to the receiving position of a new honeycomb sheet which is provided on the stack 20 by the feeder 25.
  • This new honeycomb sheet 21 is welded to the previous ones in the same way as defined above.
  • This welding process can be repeated as many times as necessary, by successive addition of honeycomb sheets 21, until a stack 20 of desired height is obtained.
  • the height of this stack 20 is limited only by the dimensions of the welding device 10, in particular by the maximum vertical distance between the plate 18 and the sonotrodes 30.
  • a welding device that can receive a stack comprising up to to fifty stacked sheets 21 stacked, that is to say having a height of about 1 meter.
  • each cellular sheet 21 is welded at the same time with an adjacent upper sheet and with an adjacent lower sheet, the welding zones being not located only in a peripheral zone. of these leaves 21.
  • each honeycomb sheet 21, with the exception of the upper and lower end sheets of the stack, comprises at least a first weld zone with an upper adjacent honeycomb sheet, and at least a second zone of welding with an adjacent lower corrugated sheet, such that each of the first and second contact areas is separated from each peripheral rim of the cellular sheet 21 by at least one cell 22.
  • the welding zones are therefore distributed over the entire surface of each cellular sheet 21, which ensures a robust connection of the honeycomb sheets 21 between them.
  • the device 10 may alternatively comprise a fixed support and moving sonotrodes relative to this support.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
EP11707446A 2010-02-01 2011-02-01 Ultraschallschweissgerät, im besonderen zum schweissen eines stapels aus zelllagen Withdrawn EP2531343A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1050659A FR2955796B1 (fr) 2010-02-01 2010-02-01 Dispositif de soudage par ultrasons, notamment pour le soudage d'un empilement de feuilles alveolees
PCT/FR2011/050195 WO2011092445A1 (fr) 2010-02-01 2011-02-01 Dispositif de soudage par ultrasons, notamment pour le soudage d'un empilement de feuilles alvéolées

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EP2531343A1 true EP2531343A1 (de) 2012-12-12

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EP (1) EP2531343A1 (de)
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NL2011454C2 (nl) * 2013-09-17 2015-03-18 Level Holding Bv Warmtewisselaar met verbeterde geometrie.
CN104148836B (zh) * 2014-08-06 2015-11-25 安徽省芜湖仪器仪表研究所 确保强迫对流流场均匀的蜂窝板的多点点焊机
CN105665860B (zh) * 2016-03-21 2017-12-12 成都天智轻量化科技有限公司 金属焊接蜂窝结构的焊接装置及制备方法

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WO2011092445A1 (fr) 2011-08-04
FR2955796B1 (fr) 2012-05-25

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