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WO2025228779A1 - Élément de vibration ultrasonore avec mécanisme de maintien lié d'un seul tenant - Google Patents

Élément de vibration ultrasonore avec mécanisme de maintien lié d'un seul tenant

Info

Publication number
WO2025228779A1
WO2025228779A1 PCT/EP2025/061189 EP2025061189W WO2025228779A1 WO 2025228779 A1 WO2025228779 A1 WO 2025228779A1 EP 2025061189 W EP2025061189 W EP 2025061189W WO 2025228779 A1 WO2025228779 A1 WO 2025228779A1
Authority
WO
WIPO (PCT)
Prior art keywords
ultrasonic
decoupling
welding system
ultrasonic vibrating
vibrating element
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.)
Pending
Application number
PCT/EP2025/061189
Other languages
German (de)
English (en)
Inventor
Dominik REBMANN
Stefan ZENDLER
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.)
Herrmann Ultraschalltechnik GmbH and Co KG
Original Assignee
Herrmann Ultraschalltechnik GmbH and Co KG
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 Herrmann Ultraschalltechnik GmbH and Co KG filed Critical Herrmann Ultraschalltechnik GmbH and Co KG
Publication of WO2025228779A1 publication Critical patent/WO2025228779A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B3/00—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B3/02—Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency involving a change of amplitude
    • 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
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
    • B23K20/106—Features related to sonotrodes
    • 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
    • B29C66/80—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
    • B29C66/816—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 mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
    • B06B2201/70—Specific application
    • B06B2201/72—Welding, joining, soldering
    • 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
    • B29C66/816—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 mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8165—Carrier plates for mounting joining tool parts, e.g. for re-arranging the tool parts to make other forms

Definitions

  • the present invention relates to an ultrasonic welding system with an ultrasonic vibrating element and a holding element to which the ultrasonic vibrating element is attached via a decoupling element.
  • the ultrasonic vibrating element can be, for example, a sonotrode, which has a surface designed to come into contact with the material being processed. This surface is generally called the sealing surface or welding surface.
  • the sonotrode is typically excited by a converter connected to it. The converter transforms an alternating electrical voltage into a mechanical vibration. Piezoelectric elements are usually used for this purpose.
  • An amplitude transformer can be positioned between the converter and the sonotrode, which alters the amplitude of the mechanical vibration generated by the converter.
  • an alternating electrical voltage to the sealing surface of the sonotrode, an ultrasonic vibration can be generated that can be transmitted to the material being processed.
  • the converter, amplitude transformer, and sonotrode can all be considered individual ultrasonic oscillating elements, which are usually tuned to each other so that each can be individually brought into resonant vibration with the ultrasonic oscillation of frequency f and wavelength A.
  • a standing wave with vibration maxima and at least one node forms along a longitudinal axis.
  • These ultrasonic oscillating elements are bounded along this longitudinal axis by end faces that exhibit a vibration maximum at resonance. The respective end faces are connected to each other. If necessary, several ultrasonic oscillating elements can be manufactured as a single unit, eliminating the need for screws or welds.
  • the described ultrasonic vibrating unit must be held in some way to move it towards the material being processed and, if necessary, to exert a force on the material.
  • a holding element is used for this purpose, but it should influence the vibration behavior of the ultrasonic vibrating unit and its individual ultrasonic vibrating elements as little as possible. Therefore, the holding element is generally designed to engage the outer surface of an ultrasonic vibrating element at a point that essentially corresponds to the described vibration node, i.e., at a location where the acoustic ultrasonic vibration exhibits a minimal amplitude in the longitudinal direction.
  • the ultrasonic vibrating element has a finite extent perpendicular to the longitudinal direction, with the consequence that the acoustic vibration in the longitudinal direction is accompanied by a thickness vibration.
  • the thickness vibration described also exhibits regions with larger and smaller amplitudes along the longitudinal axis. However, where the mounting engages the surface, i.e., where the described acoustic longitudinal vibration has a minimum amplitude, the thickness vibration amplitude is relatively large.
  • the decoupling element is materially bonded to both the ultrasonic vibration unit and the holding element.
  • a material-bonded connection encompasses both a one-piece construction, i.e., manufactured from a single piece or material, and a connection achieved through welding or soldering. Therefore, there are no clamping points that can move relative to each other during operation.
  • the design of the connection is also independent of tightening pressures or similar factors. Multiple retaining elements can also be incorporated, each material-bonded to the ultrasonic vibrating element via a decoupling element.
  • the retaining element is designed to absorb virtually no vibration. Therefore, in a preferred embodiment, the decoupling element has a mass r and the retaining element has a mass m2, where m2 > r. Preferably, m2 > 10 x r, and particularly preferably, m2 > 50 x r. This measure ensures that the retaining element absorbs practically no vibrational energy.
  • the decoupling element is connected longitudinally to a vibration node of the ultrasonic vibrating element.
  • Particularly preferred are several decoupling elements connected to both the ultrasonic vibrating element and the retaining element in a material-bonded manner. connected.
  • all decoupling elements are then connected to the ultrasonic vibrating element at a vibration node in the longitudinal direction of the ultrasonic vibrating element.
  • Positioning the decoupling element at a vibration node of the acoustic vibration in the longitudinal direction ensures that the acoustic ultrasonic vibration is influenced as little as possible by holding the ultrasonic vibration unit.
  • the decoupling element and the retaining element are manufactured in one piece, and the decoupling element is connected to the ultrasonic vibrating element via a weld.
  • several decoupling elements can be manufactured in one piece with the retaining element, or, if several retaining elements are provided, in one piece with at least one of the retaining elements.
  • the ultrasonic vibrating element has two end faces oriented perpendicular or substantially perpendicular to the longitudinal axis and a circumferential side surface connecting the two end faces.
  • the decoupling element is either connected to the side surface or the ultrasonic vibrating element has a rib on the side surface to which the decoupling element is connected.
  • the decoupling element has a bearing surface and the ultrasonic vibrating element has a support surface, the support surface resting on the bearing surface. It is advantageous if the bearing surface and the support surface are arranged perpendicular or substantially perpendicular to the longitudinal axis.
  • the ultrasonic vibrating unit By providing such surfaces, i.e., a bearing surface and a support surface, simple positioning of the ultrasonic vibrating unit relative to the holding element is possible, since the corresponding surfaces simply need to be placed on top of each other. In this position, the ultrasonic vibrating element can then be bonded to the decoupling element, i.e., the two elements can, for example, be welded together.
  • decoupling elements which are either all connected to the same retaining element or each connected to its own retaining element. If several retaining elements are provided, in a preferred embodiment these can be arranged on a common support, such as a support plate.
  • the bearing surface has a chamfer or bevel on its side facing the support surface, and/or the support surface has a chamfer or bevel on its side facing the bearing surface.
  • the chamfer creates a space that can be used to receive a welding or soldering compound in order to strengthen the metallurgical bond between the two elements.
  • the decoupling element and the retaining element materially via a weld on the support surface or the bearing surface;
  • the weld can be designed, for example, as a fillet weld or HV weld.
  • the retaining element has a top surface on which the decoupling element is arranged. Either the decoupling element projects beyond the top surface, or a recess is provided in the top surface of the retaining element next to the decoupling element.
  • the retaining element may have a through-opening in which the ultrasonic vibrating element is arranged.
  • the ultrasonic vibrating element is a sonotrode.
  • the ultrasonic vibrating element can also be an amplitude transformer (booster) or a converter.
  • Figure 1 shows a perspective view of a first embodiment of a sonotrode in a holding element according to the invention.
  • Figure 2 shows a partially cut-away side view of the embodiment of Figure 1.
  • Figure 3 shows a sectional view along line AA of Figure 2.
  • Figure 4 shows a detailed enlargement of the area labelled Y in Figure 2.
  • Figure 5 shows a detailed enlargement of the area labeled X in Figure 3.
  • Figure 6 shows a perspective view of a second inventive embodiment
  • Figure 7 shows a sectional view through the embodiment of Figure 6.
  • Figure 8 shows a perspective view of a third inventive embodiment
  • Figure 9 shows a perspective detail view of the embodiment of Figure 8.
  • Figure 10 shows a perspective view of a fourth inventive embodiment
  • Figure 11 shows a perspective detail view of the embodiment of Figure 10
  • Figure 12 shows a sectional view of an amplitude transformation element of a fifth inventive embodiment.
  • FIG 1 shows a perspective view of a first embodiment according to the invention.
  • a sonotrode 2 has two end faces 3, 11, one of which is designed as a sealing surface 3 and is therefore intended to come into contact with a material to be processed.
  • the two end faces 3, 11 are connected to each other via a circumferential side surface 4.
  • the sonotrode has three through-openings 5, which improve the vibration characteristics of the sonotrode.
  • the retaining element 6 has several decoupling elements 8, four in the example shown, which are integrally formed with the retaining element 6, i.e., manufactured from the same material in one piece.
  • the side surface 4 of the sonotrode 2 has a total of four ribs 7, which are arranged approximately at a node of the resonant ultrasonic vibration of wavelength A in the direction of the longitudinal axis 10. These ribs 7 have a downward-facing support surface, as shown in the illustration, which rests on a bearing surface on the decoupling elements 8.
  • the retaining element 6 has a through-opening in which the sonotrode 2 is held, namely on the bearing surfaces of the four decoupling elements 8.
  • the sonotrode 2 is not in contact with the retaining element 6, but only via the overlapping support surfaces of the ribs 7 or the bearing surfaces of the decoupling elements 8.
  • the decoupling elements 8 are formed by inserting into the holding element- A corresponding recess 9 is provided in ment 6.
  • the rib 7 has a length in the transverse direction, i.e., perpendicular to the longitudinal direction 10 and parallel to the side surface 4 to which the rib 7 is attached, that is shorter than the length of the bearing surface of the decoupling element 8 in this direction. This ensures that the support surface of the rib 7 always rests completely on the bearing surface of the decoupling element 8, even if the adjustment of the sonotrode would require a slightly different position relative to the retaining element 6.
  • Figure 5 shows a detailed enlargement of area X from Figure 3.
  • the sectional view shows the rib 7, which has a support surface on its underside, i.e., on the side facing the decoupling element 8.
  • This support surface has a chamfered or beveled section 13.
  • the bearing surface of the decoupling element 8 also has a chamfered section 12.
  • the bearing surface of the decoupling element 8 is wider than the support surface of the rib 7, so that the bearing surface of the decoupling element 8, including the cavity created by the chamfered section 13, provides space for a corresponding weld, which can be a V-weld.
  • Figure 6 shows a perspective view of a second embodiment according to the invention.
  • Figure 7 shows a corresponding sectional view of the embodiment shown in Figure 6. Comparing Figure 6 with Figure 1, it becomes clear that the second embodiment differs from the first embodiment only by an additional support plate 14 on which the retaining element 6 is mounted.
  • the retaining element 6 is made of a different material than the support plate 14.
  • the retaining element 6, the manufacture of which is complex, can be manufactured with significantly smaller external dimensions in the second embodiment, since it is held by the support plate 14.
  • Figure 8 shows a perspective view of a third embodiment of the invention. Comparing Figure 8 with Figure 6, it becomes clear that in the embodiment of Figure 8, instead of the retaining element 6 enclosing the sonotrode 2, there are now two retaining elements 15 and 16, which hold the sonotrode 2 and are attached to the support plate 14.
  • the perspective detail view of Figure 9 shows that each retaining element 15, 16 is connected to the sonotrode 2 via two coupling elements.
  • the carrier plate 14 could be dispensed with if it is ensured that the retaining elements 15 and 16 are each attached accordingly.
  • Figure 10 shows a perspective view of a fourth embodiment of the invention.
  • Figure 11 shows a perspective detail view of the embodiment of Figure 10.
  • Figure 12 shows a sectional view through a fifth embodiment of the invention.
  • This figure illustrates that the connection between a retaining element 22 and an ultrasonic vibrating element, such as an amplitude transformer 21, can also be achieved by the amplitude transformer 21 having a rib 24 on its outer surface and a coupling element 23 having a contact surface extending parallel to the longitudinal axis, which is in contact with a corresponding contact surface of the rib 24.
  • the connection between the coupling element 23 and the rib 24 is welded and thus metallurgically bonded.
  • a constriction 25 is provided above the rib 24, which reduces the vibrational energy transmitted via the coupling element 23.
  • This design of the connection between the coupling element 23 and the amplitude transformer 21 can also be used in all other embodiments shown.
  • the depicted embodiments can be easily calculated using FEM, allowing the device's load limits to be predicted, leading to reproducible results in series production. Assembly has virtually no influence on the load limits. Due to the material-bonded connection, there are no fluctuations in the power input required to maintain the desired vibration amplitude, and heat generation at the clamping surfaces is significantly reduced. The number of components is considerably reduced, thereby lowering costs. Reference symbol list

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne un système de soudage par ultrasons comprenant un élément de vibration ultrasonore (2) et un élément de maintien (6) auquel l'élément de vibration ultrasonore (2) est fixé par l'intermédiaire d'un élément de découplage (8), l'élément de découplage (8) étant lié d'un seul tenant, par exemple soudé, à la fois à l'élément de vibration ultrasonore (2) et à l'élément de maintien (6).
PCT/EP2025/061189 2024-05-02 2025-04-24 Élément de vibration ultrasonore avec mécanisme de maintien lié d'un seul tenant Pending WO2025228779A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102024112262.5A DE102024112262A1 (de) 2024-05-02 2024-05-02 Ultraschallschwingelement mit stoffschlüssiger Halterung
DE102024112262.5 2024-05-02

Publications (1)

Publication Number Publication Date
WO2025228779A1 true WO2025228779A1 (fr) 2025-11-06

Family

ID=95558877

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2025/061189 Pending WO2025228779A1 (fr) 2024-05-02 2025-04-24 Élément de vibration ultrasonore avec mécanisme de maintien lié d'un seul tenant

Country Status (2)

Country Link
DE (1) DE102024112262A1 (fr)
WO (1) WO2025228779A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030111513A1 (en) * 2001-12-18 2003-06-19 Ehlert Thomas David Rigid isolation of rotary ultrasonic horn
US20180222123A1 (en) * 2015-08-06 2018-08-09 Branson Ultrasonics Corporation Holding structure of an ultrasonic vibration transmission mechanism
WO2023022988A1 (fr) * 2021-08-16 2023-02-23 Dukane Ias, Llc Systèmes et procédés utilisant un transducteur ultrasonore et le mouvement d'un bras de frottement pour sceller une pièce

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW548759B (en) * 2001-06-28 2003-08-21 Shinkawa Kk Transducer and bonding device
JP4583190B2 (ja) * 2005-01-28 2010-11-17 富士通株式会社 共振器、超音波接合ヘッド及び超音波接合装置
DE102010005230A1 (de) * 2010-01-21 2011-07-28 ATHENA Technologie Beratung GmbH, 33106 Vorrichtung und Verfahren zur Ultraschall-Materialbearbeitung
DE102016116429A1 (de) * 2016-09-02 2018-03-08 Herrmann Ultraschalltechnik Gmbh & Co. Kg Ultraschallschwingsystem mit Mantelflächenhalterung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030111513A1 (en) * 2001-12-18 2003-06-19 Ehlert Thomas David Rigid isolation of rotary ultrasonic horn
US20180222123A1 (en) * 2015-08-06 2018-08-09 Branson Ultrasonics Corporation Holding structure of an ultrasonic vibration transmission mechanism
WO2023022988A1 (fr) * 2021-08-16 2023-02-23 Dukane Ias, Llc Systèmes et procédés utilisant un transducteur ultrasonore et le mouvement d'un bras de frottement pour sceller une pièce

Also Published As

Publication number Publication date
DE102024112262A1 (de) 2025-11-06

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