EP4308311A1 - Suramplificateur à ultrasons et dispositif de traitement de pièces à usiner - Google Patents

Suramplificateur à ultrasons et dispositif de traitement de pièces à usiner

Info

Publication number
EP4308311A1
EP4308311A1 EP21713934.4A EP21713934A EP4308311A1 EP 4308311 A1 EP4308311 A1 EP 4308311A1 EP 21713934 A EP21713934 A EP 21713934A EP 4308311 A1 EP4308311 A1 EP 4308311A1
Authority
EP
European Patent Office
Prior art keywords
booster
ultrasonic
sonotrode
longitudinal
vibrations
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
EP21713934.4A
Other languages
German (de)
English (en)
Inventor
Peter Solenthaler
Albert Büttiker
Pascal Büchel
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.)
Telsonic Holding AG
Original Assignee
Telsonic Holding AG
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 Telsonic Holding AG filed Critical Telsonic Holding AG
Publication of EP4308311A1 publication Critical patent/EP4308311A1/fr
Pending legal-status Critical Current

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
    • 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
    • B29C65/081—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations having a component of vibration not perpendicular to the welding surface
    • B29C65/082—Angular, i.e. torsional ultrasonic welding
    • 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
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2422—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical
    • B29C66/24221—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being circular, oval or elliptical being circular
    • 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
    • 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
    • B29C66/8141—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
    • 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
    • B29C66/8141—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81433—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
    • 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
    • B29C66/8167—Quick change joining tools or surfaces
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/847—Drilling standard machine type
    • 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
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
    • 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
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/61—Joining from or joining on the inside
    • 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
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3044—Bumpers
    • 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
    • B29L2031/3481—Housings or casings incorporating or embedding electric or electronic elements

Definitions

  • the invention relates to an ultrasonic booster and a device for machining workpieces having the features of the preambles of the independent claims.
  • Ultrasonic vibrations are generated by a converter vibrating in a longitudinal direction.
  • a converter vibrating in a longitudinal direction.
  • WO 95/23668 discloses a method and a device for welding metal parts, in which a sonotrode body is set in torsional vibrations.
  • a disadvantage of this arrangement is that, despite the torsional vibration generated, longitudinal components are still present, which can lead to damage to the workpiece or to undesired damping.
  • WO 2012/069413 A1 it was therefore proposed to design and stimulate a sonotrode in such a way that the entire sonotrode can be excited to produce a torsional vibration with a negligibly small longitudinal vibration component.
  • vibrations introduced tangentially to the sonotrode body.
  • longitudinal components can be avoided and good welding results can be achieved.
  • the construction is relatively complex.
  • the sonotrode is a wearing part. The introduction of conversion structures into the sonotrode is laborious and therefore leads to unnecessarily high costs for a wearing part.
  • the inventive ultrasonic booster is used to excite a sonotrode for machining workpieces with ultrasonic vibrations.
  • the ultrasonic booster has a booster body with a longitudinal axis.
  • the booster body has a sound introduction side and a coupling side.
  • the sound introduction side is provided with a first end face.
  • the coupling side is provided with a second face.
  • the second end serves to connect the ultrasonic booster to a sonotrode.
  • a conversion structure is arranged between the sound introduction side and the coupling side. With the conversion structure, transverse vibrations with a vibration component in a plane perpendicular to the longitudinal axis can be generated from the introduced longitudinal vibrations.
  • torsional vibrations can thus be generated from longitudinal vibrations in a simple manner and transferred to a sonotrode.
  • a sonotrode can be easily exchanged or replaced. Particularly in the case of wear or when using several sonotrodes with different processing surfaces for a workpiece, it is therefore sufficient to only use the conversion structures in one component, i. H. the booster to arrange.
  • a damping structure is preferably provided between the conversion structure and the coupling side.
  • the damping structure is designed in such a way that the longitudinal vibrations on the coupling side are reduced.
  • the introduced longitudinal vibrations are converted to transverse vibrations in a manner known per se (cf., for example, WO 95/23668).
  • the damping structure ensures that longitudinal vibrations are not transmitted to the coupling side, or at most to a negligible extent.
  • the damping structure is designed in such a way that there is as little damping as possible in the torsional direction, so that the torsional vibrations are transmitted to the coupling side with as little damping as possible.
  • the booster body is designed as a hollow body.
  • the booster body it is also conceivable for the booster body to be designed partially or entirely as a solid body. In particular, depending on the planned application, a hollow body or a solid body may be preferred.
  • the ultrasonic booster is preferably provided with a connection interface, in particular with a thread, for connection to the sonotrode.
  • a sonotrode can be connected particularly easily to the ultrasonic booster using a threaded connection.
  • the ultrasonic booster also preferably has a contour for a tool for connecting the ultrasonic booster to the sonotrode, in particular adjacent to the sound introduction side. Typically, it is a hexagonal contour. This allows the ultrasonic booster to be easily connected to the sonotrode using a conventional hexagonal key.
  • the booster body is preferably otherwise of rotationally symmetrical design, in particular with a circular or annular cross section.
  • Torsion sonotrodes can be used, for example, for welding plastic parts or metal parts. Typical applications include the welding of plastic sensor holders into car bumpers or the welding of metallic strands to one another or strands to connection parts. In principle, however, the use of the ultrasonic booster according to the invention is not limited to specific areas of use.
  • the booster body is designed to be rotationally symmetrical and in particular circular, it typically has a diameter of less than a quarter of the longitudinal wavelength, ie at a frequency of 20 kHz typically have less than 60 mm, preferably less than 50 mm and more preferably about 25 mm to 35 mm. It has been shown that particularly stable vibration behavior can be achieved with such relatively small diameters.
  • ultrasonic vibrations are introduced at a frequency of 15 kHz to 50 kHz, preferably 20 kHz to 35 kHz.
  • the conversion structure is preferably in the form of material cutouts on an outer surface of the booster body.
  • the material recesses can never extend along a helical line.
  • the material cutouts can be in the form of conversion slots.
  • the number of conversion slots can be in the range from 3 to 12 and is preferably 6. However, it is also conceivable to provide material cutouts in the form of individual holes on a helix.
  • the helix can be arranged with a constant pitch or with a variable pitch.
  • the material recesses are arranged along a curve with a curvature on the outer surface of the booster body.
  • the helix preferably has an angle of about 45° relative to the longitudinal axis of the booster body.
  • the conversion structure and the damping structure are formed as separate structures that are separate from one another.
  • the gradient in the case of conversion structures extending along a curve with a variable gradient, it is conceivable for the gradient to decrease to such an extent that the structure ends in an area that is approximately in one plane runs perpendicular to the axis and forms a damping structure there.
  • damping structure which runs in a plane perpendicular to the axis is particularly advantageous, it cannot be ruled out that the damping structure does not run exactly perpendicular to the axis.
  • the damping structure may run at an angle of between 85° and 95° with respect to the axis. While a damping structure with a constant slope is advantageous, damping structures with variable slopes are also possible.
  • the conversion structure in the form of material accumulations on the outer surface and/or on an inner surface of the booster body.
  • accumulations of material can be provided in booster bodies that are produced using additive manufacturing processes. This can be advantageous in particular in applications where high demands are placed on hygiene.
  • accumulations of material of this type instead of openings advantageously reduce the deposit of bacteria or the passage of bacteria or dirt in packaging applications.
  • the material recesses can extend through the entire wall of the booster body. But it is also conceivable to provide the material recesses only as indentations on the outer surface of a booster body, particularly in connection with a booster body not formed as a hollow body. Conversion structures with a combination of material cutouts and material accumulations or combinations of material cutouts of different shapes as described above are also conceivable.
  • the damping structure is typically formed by weakening the material in the booster body. This can be a material weakening in the form of damping slots. The damping slots extend in particular in a direction perpendicular to the longitudinal axis of the booster body.
  • the damping structure has a filter function for the longitudinal vibrations so that only vibrations with torsional components are transmitted. It is also conceivable to provide several rows of damping slots.
  • the number of damping slots can range from 3 to 12 and is preferably 6.
  • damping slots other types of damping are also conceivable.
  • damping slots other types of material weakening can be provided, for example by material processing, which reduces the modulus of elasticity with regard to deformations in the longitudinal direction. It is also conceivable to form the damping structure by providing additional materials.
  • the conversion structure typically extends over a length in the longitudinal direction of the ultrasonic component, which extends about 10% to 30%, preferably about 15% to 25% of the length of the booster body. It has been shown that a particularly optimal conversion of longitudinal vibrations into transverse vibrations can be achieved with such a length.
  • the conversion structure is preferably arranged eccentrically, viewed in the longitudinal direction, between the damping structure and the first end face, specifically closer to the first end face.
  • An intermediate area is formed between the conversion structure and the damping structure.
  • this intermediate area viewed in the longitudinal direction, the distribution between the proportion of longitudinal vibrations and torsional vibrations changes continuously.
  • the proportions between longitudinal and torsional vibrating vibration components change along the longitudinal axis.
  • the damping structure is preferably arranged in the area of an amplitude maximum of the torsional vibrations or a maximum portion of the torsional vibrations.
  • the length of the intermediate area is preferably selected such that the proportion of torsional vibrations is minimized in a central area of the damping structure. This results in particularly stable amplitudes and low frequency fluctuations.
  • a depression is also arranged in the first end face on the sound introduction side.
  • the depression is provided with a coupling surface for connecting the booster body to an oscillating surface of an ultrasonic converter.
  • an optimized coupling of the longitudinal vibrations can be achieved.
  • an arrangement as in the pending application EP 3663 008 can be used, the content of which is made the subject of the present application by cross-reference.
  • a stop flange is provided on the outer surface of the booster body in the area of the second end face for stopping against a sound introduction tion surface of a sonotrode provided.
  • the booster body can also have a thread for connection to a sonotrode. The thread extends from this stop flange on the opposite side of the conversion structure.
  • the booster body can typically be designed in one piece and consist, for example, of steel, titanium, aluminum or of a ceramic. However, it is also conceivable to provide multi-part booster bodies. In this context, it is particularly conceivable to also use booster bodies made from several parts made from different materials. In particular, it is conceivable to provide an additional damping material between the coupling side and the sound introduction side in the area of the damping structure.
  • the conversion structure, the damping structure, the sound introduction side, the length of the booster body and the second end face are particularly preferably coordinated with one another so that the direction of vibration of the torsional vibrations on one side of the damping structure is in the opposite direction to the torsional vibrations the other side of the damping structure.
  • a suitable dimensioning can be defined in particular by finite element calculations. In particular, a stable and therefore more reliable amplitude and a small frequency variation is achieved through sufficient stiffness of the webs in the area of the damping structure.
  • the invention also relates to a device for processing workpieces using ultrasound.
  • the device has at least one ultrasonic booster as described above.
  • a sonotrode is connected, in particular screwed, to the coupling side of the ultrasound booster on a sound introduction side.
  • the device preferably has a Converter for operating the ultrasonic booster and in particular for initiating longitudinal vibrations in the sound input line side of the ultrasonic booster.
  • the device also has a receptacle for a workpiece to be processed.
  • the device has an actuating device for moving the ultrasonic booster and the sonotrode towards the receptacle.
  • the sonotrode can also be provided with a holder and centering for a workpiece, in particular with a spring-loaded holder.
  • the mounting and centering is preferably attached in a local torsional vibration minimum of the sonot rode.
  • the invention relates to a method for processing workpieces using ultrasound.
  • an ultrasonic booster with a sonotrode as described above is used.
  • longitudina le vibrations are initiated on a sound introduction side of a booster body.
  • the introduced longitudinal oscillations are transformed by means of a conversion structure into torsional oscillations with an oscillation component in a plane perpendicular to the direction of oscillation of the longitudinal oscillations.
  • FIG. 1 shows a schematic representation of a device according to the invention
  • FIG. 2 shows a perspective representation of a first ultrasonic booster according to the invention with a sonotro de
  • FIG. 3 shows a perspective representation of a second ultrasonic booster according to the invention with a sonotro de
  • FIG. 4 shows a partially transparent perspective representation of the embodiment according to FIG. 3;
  • FIG. 5a/b shows a schematic representation of the oscillation behavior of an ultrasonic booster according to the invention.
  • Figure 6 shows an enlarged representation of the damping structure of the embodiment according to Figure 2.
  • FIG. 1 shows a schematic of a device 2 for processing workpieces W. Two parts are shown here as workpieces W, which are to be welded to one another.
  • the device 2 has a receptacle 41 for receiving the workpieces W.
  • FIG. 1 shows a schematic of a device 2 for processing workpieces W. Two parts are shown here as workpieces W, which are to be welded to one another.
  • the device 2 has a receptacle 41 for receiving the workpieces W.
  • An ultrasonic booster 1 with a booster body 10 can be excited to ultrasonic vibrations by means of a converter 40 .
  • the converter 40 is excited by an ultrasonic generator 33 to form longitudinal oscillations SL in a longitudinal direction.
  • 12 longitudinal oscillations SL are coupled into a first end face and then converted into torsional oscillations ST, so that at a second end page 14 arise on a coupling side 13 of the booster body 10 torsional vibrations ST.
  • the sonotrode 30 is a torsional sonotrode and introduces torsional vibrations ST into the workpiece W.
  • the stack of converter 40, ultrasonic booster 1 and sonotrode 30 is mounted in a machine frame and can be moved in the axial direction A by means of a drive, so that the sonotrode 30 with a work surface 32 can be moved in the direction of the workpiece W.
  • a pneumatic drive 42 is typically provided to move the stack in the axial direction A.
  • servo presses in a manner known per se are also conceivable.
  • FIG. 2 shows a perspective view of a first embodiment of an ultrasonic booster 1 according to the invention with a sonotrode 30 for use with a frequency of 35 kHz.
  • the ultrasound booster 1 has a substantially cylindrical booster body 10 .
  • the booster body 10 has a sound introduction side 11 with a first end face 12 and a coupling side 13 with a second end face 14 .
  • the second end face 14 is formed by a stop flange 22 .
  • Longitudinal oscillations SL can be introduced into the ultrasonic booster 1 in the longitudinal direction L on the first end face 12 .
  • the booster body 10 has a blind hole-like depression 20 on the first end face 12 .
  • a converter can be connected to the depression 20 so that longitudinal oscillations SL can be coupled into the ultrasound booster 1 .
  • the ultrasonic booster 1 also has a hexagonal contour 28 for a tool. This allows the Ultra Screw sound booster 1 to a sonotrode using a tool.
  • the booster body 10 is designed as a hollow body in the area of the conversion structure, and the conversion slots 16 extend through the casing of the hollow body.
  • the conversion slots 16 result in oscillations with a torsional component ST being generated from the longitudinal oscillations SL, which are introduced into the ultrasonic booster 1 on the sound introduction side 11 .
  • a damping area 18 adjoins the intermediate area 9 .
  • the damping area 18 is formed by two rows of damping slots 19 which extend in the circumferential direction along a surface 17 of the booster body 10 .
  • the slots 19 are arranged regularly over the circumference of the booster body 10 and are separated from one another by webs 8 running in the longitudinal direction (see also FIG. 6).
  • the coupling side 13 Viewed in the longitudinal direction L after the damping structure 18, the coupling side 13 is located with the stop flange 22.
  • the webs 8 connect the intermediate area 9 with the coupling side 13.
  • Torsional vibration components are transmitted to the coupling side 13 via the webs 8, so that these are almost exclusively oscillates with torsional vibrations ST. There are hardly any vibrations in the longitudinal direction L on the coupling side 13 .
  • the torsional vibrations ST run in a plane E perpendicular to the longitudinal axis L.
  • a thread 27 for connection to the sonotrode 30 is provided in the longitudinal direction L adjoining the stop flange 22 .
  • the sonotrode 30 is formed in a manner known per se. On a sound introduction surface 31 it has an internal thread 34 for connection to the external thread 27 of the ultrasonic booster 1 .
  • the dimensions of the booster body and in particular the conversion slots 16 and the damping slots 19 and their arrangement on the booster body 10 are chosen so that the planned excitation frequency results in particularly stable amplitudes and low frequency fluctuations.
  • the torsional and the longitudinal frequency should be as superimposed as possible.
  • the damping slots 19 should be dimensioned and positioned in such a way that a phase reversal of the torsional vibrations occurs in a central area of the damping structure 18, i.e. there is a minimum of torsional vibrations.
  • the booster body 10 can be dimensioned as follows.
  • the booster body 10 has (without the protruding thread 27) ei ne length 1, which is determined depending on the material and frequency. In the embodiment shown here (well ches represents real proportions) the length 1 is less than half a longitudinal wavelength.
  • the conversion slots 16 do not overlap and run at an angle of preferably 45°. Depending on the number of conversion slots 16, they therefore have a length k in the longitudinal direction L, which is approximately in the range from D/6 to 3D, with 6 conversion slots 19 approximately D/2. where D is the outer diameter of the booster body 10. In the exemplary embodiment shown here, the length k is approximately 15% of the total length 1 of the booster body 10.
  • the conversion slots 16 run on helical lines at an angle of approximately 45° relative to the longitudinal axis L. However, the helical line can also have a variable pitch, so that the angle is not the same at every point of the conversion slots 16.
  • the intermediate region 9 typically has a length that is greater than a quarter of the torsional wavelength.
  • the length of the damping structure 18 is selected in such a way that sufficient elasticity and thus sufficient damping is achieved.
  • the conversion slots begin at a distance from the end face 12, which corresponds approximately to the distance k.
  • the coupling side 13 excluding the thread 27 is formed short, so that the highest possible torsional amplitude is present in the area of the stop flange 2 .
  • the conversion slots 16 typically begin at a distance of about one eighth of the longitudinal wavelength from the first face 12. Viewed in the longitudinal direction L, the damping slots 19 typically have a height h (see FIG. 6) of 1 mm to 10 mm. Similar dimensions also apply to the following exemplary embodiments.
  • FIG. 3 shows a perspective view of a second embodiment of an ultrasonic booster 2 with a sonotrode 30 for use with ultrasonic frequencies of 30 kHz. Same reference numerals denote the same components. In contrast to the embodiment according to FIG. 2, the booster body 10 and the sonotrode 30 are longer and thicker. The sonotrode 30 is also provided with an additional oscillating mass 35 for adjustment to the oscillating frequency and amplitude.
  • the booster body 10 is designed as a hollow body.
  • the booster body 10 has a circular cross section.
  • the cross section has a variable outer diameter.
  • the outer diameter in the area of the conversion structure 15 is slightly larger than in the intermediate area 9.
  • a step 21 serves to adapt the elasticity and to reduce the rigidity.
  • the conversion slots 16 and the damping slots 19 extend through the entire wall of the hollow-cylindrical booster body 10.
  • damping slots 19 are arranged, viewed in the circumferential direction.
  • the Len ge of the damping slots 19 in the circumferential direction is greater than the length of the webs 8 in this embodiment.
  • the webs 8 and the damping slots 19 each extend together over an angular range of about 60 °, the slots over about 50 ° and the webs 8 extend over approximately 10°.
  • the center points of the first row of damping slots 19 are aligned in the direction of the longitudinal axis L with the centers of the conversion slots 16.
  • the second row of damping slots is offset by 30° in relation to the first row of damping slots, so that the webs 8 of the first row of damping slots 19 are in the middle of the damping slots 19 of the second row.
  • the center points mentioned can of course also be offset from one another with respect to the longitudinal axis L.
  • FIG. 4 shows the embodiment according to FIG. 3 in a partially transparent representation.
  • the sonotrode 30 is designed as a hollow body and has a through hole. Viewed in the longitudinal direction L, the internal thread 34 is adjoined by a threaded bore 36 with a smaller internal diameter.
  • the sonotrode 30 has a bell-shaped recess 37 adjoining the inner bore 16 .
  • the threaded bore 36 is arranged in a torsional vibration zero point. It serves to accommodate a centering and holder for a workpiece W to be machined.
  • Such a centering and holder can be configured, for example, as shown in DE 10204 212 313 (the content of which is incorporated by cross-reference in the present application) and a resilient mounting bid for a workpiece.
  • FIGS. 5a and 5b show the vibration behavior of a further embodiment of a sonotrode 30, which is excited to torsional vibrations ST with an ultrasonic booster 1 according to the invention.
  • the ultrasonic booster 1 shown here has only one row of damping slots 19.
  • the torsional vibrations ST have a tangential vibration direction around the longitudinal axis L.
  • the distribution of the longitudinal and torsional components depends on the arrangement and size of the conversion slots 16 and the damping slots 19 .
  • the conversion slots 16 and the damping slots 19 are specifically arranged in such a way that the most stable possible vibration behavior is achieved.
  • FIGS. 5a and 5b show two FEM calculations, each with the maximum torsional amplitude of the ultrasonic booster 1 in the area of the second end face 14. The direction of vibration at the respective point in time is shown schematically by means of arrows.
  • vibrations with a torsional and longitudinal component are present in a second section II (symbolized by an oblique arrow), with the torsional components increasing as seen in the longitudinal direction L.
  • the direction of vibration of the torsional vibrations in the area of the damping structure 18 is deflected. There is a phase reversal in a central area.
  • the torsional vibrations in area IV occur in the opposite direction to the vibrations in area III. In this way, a very stable vibration situation is achieved.
  • In the area of the end face 14 of the ultrasonic booster 1 there are almost only torsional vibrations, so that the sonotrode is excited to almost pure torsional vibrations.
  • FIGS. 2 to 5 are typically used for welding plastic parts when the parts are brought into contact with a work surface 32.
  • the working surface 32 is formed in a manner known per se and may, for example, have a corrugation.
  • FIG. 6 shows an enlarged representation of the damping structure 18 of the embodiment according to FIG. the webs 8 divide the damping slots 19 of an upper and a lower row.
  • the damping slots 19 of the upper row are offset by 30° with respect to the damping slots 19 of the lower row.
  • the height h and the position of the damping slots 19 is specifically selected so that from an area above the upper row of damping slots 19 to a region below the lower row of damping slots and in particular the stop flange 22 there is a reversal of the torsional vibration direction (shown schematically with arrows).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

L'invention concerne un suramplificateur à ultrasons (1) destiné à une sonotrode (30) pour le traitement de pièces à usiner (W) par des vibrations ultrasonores, comprenant un corps de suramplificateur (10). Des vibrations longitudinales (SL) sont introduites dans le corps de suramplificateur (10) sur un côté d'introduction de son (11) comprenant un premier côté d'extrémité (12). Une structure de conversion (15), au moyen de laquelle des vibrations transversales (ST) comprenant une composante de vibration dans un plan (E) perpendiculaire à l'axe longitudinal (L) sont générées à partir des vibrations longitudinales (SL), est située entre le côté d'introduction de son (11) et un côté de couplage (13) opposé au côté d'introduction de son.
EP21713934.4A 2021-03-19 2021-03-19 Suramplificateur à ultrasons et dispositif de traitement de pièces à usiner Pending EP4308311A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2021/057042 WO2022194383A1 (fr) 2021-03-19 2021-03-19 Suramplificateur à ultrasons et dispositif de traitement de pièces à usiner

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EP4308311A1 true EP4308311A1 (fr) 2024-01-24

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EP21713934.4A Pending EP4308311A1 (fr) 2021-03-19 2021-03-19 Suramplificateur à ultrasons et dispositif de traitement de pièces à usiner

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US (1) US20240165735A1 (fr)
EP (1) EP4308311A1 (fr)
CN (1) CN116981520A (fr)
WO (1) WO2022194383A1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4663556A (en) 1984-01-11 1987-05-05 Hitachi Maxell, Ltd. Torsional mode ultrasonic vibrator
JP2557310B2 (ja) * 1993-04-08 1996-11-27 三島 大二 縦振動を捩り振動に変換する工具ホーン
DE4406818C1 (de) 1994-03-02 1995-10-05 Schunk Ultraschalltechnik Gmbh Verfahren und Vorrichtung zum Verschweißen von zumindest Metallteilen
AU5943900A (en) 1999-11-29 2001-05-31 Alcon Universal Limited Torsional ultrasound handpiece
WO2006014318A2 (fr) 2004-07-02 2006-02-09 Easley James C Pointe de dissection a torsion, a tete en forme generale d'ananas
GB0819712D0 (en) 2008-10-27 2008-12-03 Sra Dev Ltd Torsional generator
EP2457683A1 (fr) 2010-11-25 2012-05-30 Telsonic Holding AG Soudage torsionnel
KR20180088730A (ko) * 2015-12-04 2018-08-06 가부시키가이샤 신가와 초음파 혼
EP3663008B1 (fr) 2018-12-06 2023-10-25 Telsonic Holding AG Générateur d'ultrasons, système de générateur d'ultrasons et procédé de fonctionnement d'un générateur d'ultrasons
EP3822018A1 (fr) * 2019-11-15 2021-05-19 Telsonic Holding AG Composant à ultrasons, dispositif d'usinage des pièces et procédé d'usinage des pièces

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CN116981520A (zh) 2023-10-31
US20240165735A1 (en) 2024-05-23
WO2022194383A1 (fr) 2022-09-22

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