DE102009048696B3 - Sonotrode arrangement for e.g. plastic machining and processing tools used in ultrasonic welding of workpiece, has fitting groove arranged in end region that lies opposite to clamping position of slot - Google Patents

Abstract

The arrangement has a circular ring shaped bearing surface arranged concentric to a through hole. A sonotrode thread side clamping shell (3) comprises screw holes and a fixing pin borehole, which corresponds to a threaded hole and fixing pin hole in a sonotrode mold surface side clamping shell (2) i.e. cylindrical plane disk. The sonotrode (1) is clamped only at outer sonotrode ring in an end region of slot. A fitting groove is arranged in an end region, which lies opposite to a clamping position of the slot.

Description

The invention relates to a sonotrode arrangement for use in plastic processing tools, such as ultrasonic welding, cutting, punching u. Ä. Or in plastic processing tools, such. B. in injection molds, where the ultrasound is used to influence the plastic melt.

The sonotrode arrangement is installed in the plastic processing and processing tools and is intended to ensure that the sonotrode can swing freely in the longitudinal and transverse direction and in addition to a Sonotrodenanpresskraft also acting on the Sonotrodenformfläche forces, such as those arising during injection molding by the injection pressure record ,

From the DE 29503122.0 U1 is a sonotrode for performing ultrasonic welding work known in which the ultrasound performance of the converter should be transmitted as low loss on the workpiece to be welded and to compensate for the turning and tilting moments as they arise when placing the sonotrode on the workpiece. For this purpose, the sonotrode is supported by two or more transformation pieces, which are arranged distributed on the top of the sonotrode, which absorb the bending, turning and tilting moments of the sonotrode during placement.

In the vibration node of the rotationally symmetrical transformation piece a massive, circumferential, annular collar is arranged, which is integrally connected via a thin cross-sectionally L-shaped web with the transformation piece. For clamping the sonotrode is clamped to the circumferential, annular collar of the transformation piece in the support device. The ultrasonic vibrations are difficult to propagate from the sonotrode through the thin L-shaped web to the support means, resulting in a decoupling between the sonotrode and the support means.

A disadvantage of this sonotrode mount is that they can absorb a large Sonotrodenanpresskraft not greater acting on the Sonotrodenformflächen forces, but thereby limited in their function or even destroyed.

In addition, a precise guidance and adjustment of the sonotrode in the μ range in a plastic processing tool is not possible.

In the DE 29601393 U1 An ultrasound sonotrode with vibration-free flange for sonicating liquids in a vessel is described, with a liquid and airtight and pressure-tight seal between the sonotrode and the vessel should be guaranteed.

By forming a thin-walled, elastic region on the flange of the sonotrode and its arrangement in the vibration node of the sonotrode is to be achieved that radial and longitudinal residual vibrations are cushioned in this area, so that a decoupling of ultrasonic waves and thus a reliable seal between sonotrode and Vessel is reached. The flange is screwed to the vessel via a rubber seal.

This rod-shaped sonotrode is suitable only for the introduction of ultrasonic waves in fluid media and can absorb or compensate for any forces. The application and use in a plastic processing or processing tool are excluded.

Furthermore, from the DE 10153706 B4 a device for coupling of ultrasound in an injection mold known. Here, the direct, local coupling of ultrasound into the cavity of the injection mold and is to contribute by a brief, partial heating of the melt to improve the mechanical properties of the moldings, especially in Bindenahtbereich and to improve the flow behavior of the plastic melt during the molding process.

The sonotrode is integrated in a tool plate of the injection mold and is held at its circumferential mounting ring in the node between two spacers and clamped tightly with a clamping ring, the sonotrode extends directly to the cavity and the end face simultaneously forms part of the Kavitätswandung.

A disadvantage of this device is that the sonotrode is disturbed by the rigid, fixed clamping on Sonotrodenbund in their vibration behavior, in particular in their transverse vibration behavior and massively hindered and thus the transmission behavior of ultrasonic energy is deteriorated.

In addition, the centering of the sonotrode is insufficient and the uniform, circumferential vibration gap, which is necessary between the sonotrode and the cavity, can not be met. The forces acting on the sonotrode molding surface during the continuous injection molding cycles due to the injection pressure cause tilting, turning and bending moments, which successively displace the sonotrode until it rests against the cavity and thus strongly in its longitudinal oscillation behavior is limited or what can lead to material destruction in the contact area.

Other fastening and holding devices for vibration elements or vibrating elements are from the EP 667 189 A2 , of the DE 1 203 498 A and the DE 2 034 928 A known.

In the EP 667 189 A2 a holder for a freestanding sonotrode for ultrasonic welding of plastic molded parts made of thermoplastic is described. With this sonotrode mount here a decoupling between the vibration member and the holder is to be achieved in terms of vibration technology in order to prevent or minimize the loss of vibration energy through the transmission of vibrations to the holder and transmission to other parts of the welding device. For this purpose, the sonotrode in the vibration node has a circumferential thin, elastic, annular flange on which it is bordered between two expansion rings with radial play, and this in turn is clamped axially between two screwed together, in cross-section L-shaped clamping rings. The clamping rings also serve to accommodate the sonotrode in a device housing.

The DE 1 203 498 A relates to a holder for a vibration transmitter for transmitting mechanical vibrations to a workpiece for the purpose of ultrasonic material testing. The holder consists of a cylindrical, tubular receiving sleeve in which a piezoelectric disc is arranged as a vibration generator against a spring force longitudinally displaceable.

This holder is to allow that in the handling of the device a vibration state of the piezoelectric disk is achieved, in which a firm concern of the disc is ensured on the workpiece to be tested, while the disc itself is almost free, d. H. undamped, can swing within the holder and so a perfect material testing is done.

For this purpose, a cylindrical, tubular holding body is concentrically arranged in the receiving sleeve with three evenly distributed on the circumference hook-like webs, which engage with their bent ends in the, incorporated in the lateral surface of the piezoelectric disc longitudinal grooves and thus guide the disk in the axial direction, whereby the Disc is self-adjusting stored within the holder. From the DE 2 034 928 A an ultrasonic generator with a sonotrode holder is known in which a vibration decoupling between sonotrode and holder is to be achieved. The free-standing sonotrode is centric to a thin, circular plate screwed and held by this. The retaining plate in turn is bolted to the edge of the bracket. In the holding plate, slit-shaped, overlapping apertures are arranged concentrically around the sonotrode and interrupt all straight sound paths from the sonotrode to the holder. The remaining between the apertures webs that connect the sonotrode with the holder, extending substantially zigzag and thus form for the vibrations emanating from the sonotrode uneven-line sound paths, whereby the still exceeding for holding vibrations are reduced.

These mentioned mounting and holding devices for vibrators or sonotrodes are completely unsuitable for the transmission of ultrasonic energy in Kunststoffbe- or -verarbeitungswerkzeuge, as they take up large clamping forces and precise support, guidance and centering of the sonotrode in the x-, y- and z-direction not ensure and also the absorption of large axial forces on the sonotrode, as z. B. in injection molding caused by the injection pressure, do not allow.

The object of the invention is to provide a sonotrode arrangement for low-loss introduction and transmission of ultrasonic energy in Kunststoffver- or -bearbeitungswerkzeuge that allows low vibration damping and high clamping forces in the clamping range of the sonotrode, precise mounting, guidance and centering of the sonotrode in x- , y and z direction and allows the absorption of large axial forces from the Sonotrodenformfläche forth.

According to the sonotrode arrangement of a sonotrode, a sonotrodenformflächenseitigen clamping shell and a sonotrodengewindeseitigen clamping shell is constructed. The sonotrode is held and centered as in a housing, which is formed by the two clamping shells. For this purpose, the sonotrodenformflächenseitige clamping shell from the Sonotrodenformfläche forth and the sonotrodengewindeseitige clamping shell are pushed from the Sonotrodengewindeseite forth on the sonotrode and firmly but releasably connected together.

The sonotrode has a circumferential collar in the vibration node, which is provided with slots arranged concentrically and radially to the sonotrode axis, which are interrupted by webs in their course. As a result, the collar is divided into an inner and an outer ring, so that the inner ring is thus integrally connected to the sonotrode and the outer ring only via the webs with the inner ring of the sonotrode.

At the periphery of the outer sonotrode ring is at a defined location a fitting groove, the in cooperation with a dowel pin in the sonotrodengewindeseitigen clamping shell allows a reproducible positional fixation of the sonotrode during assembly of the sonotrode arrangement.

The sonotrodenformflächenseitige clamping shell is a substantially cylindrical, flat disc with two or more on a pitch circle, close to the outer diameter, evenly distributed threaded holes and a dowel hole. In the middle of the clamping shell a hole for the passage of the sonotrode is arranged. On the clamping side of the clamping shell extends, starting from the threaded holes, each a raised rectangular terminal strip converging to the clamping cup center and ends at a defined distance in front of the through hole. The diameters of the through hole and the sonotrode at the mold surface side end are coordinated so that a uniform, circumferential gap arises, which is only so large that the sonotrode can swing freely. The outer diameter of the clamping shell is dimensioned so that it can dive into a free outer recess of the sonotrodengewindeseitigen clamping shell and is centered there.

The sonotrodengewindeseitige clamping shell also has centrally a through hole for the sonotrode, which is tuned in its diameter to the diameter of the sonotrode at the threaded end, that also a uniform, circumferential gap is formed, which corresponds dimensionally but a generous clearance.

Concentric to the through hole are further an annular outer recess and therein a further, lower-lying annular inner recess introduced from the clamping side in this clamping shell. From the circumference of this inner recess protrude, evenly distributed on the circumference, two or more strip-shaped centering out.

At this Zentrierschultern then run on the bottom of the inner recess strip-shaped clamping shoulders, which merge into an annular bearing surface, which is arranged concentrically to the through hole. The clamping shoulders and the annular bearing surface are also raised and protrude from the ground. In the sonotrodengewindeseitigen clamping shell further, matching and corresponding to the threaded holes in the sonotrodenformflächenseitigen clamping shell, two or more bolt holes and a dowel hole are introduced.

The screw holes, the centering shoulders and the clamping shoulders lie on the same lines that converge from the circumference of the clamping shell to the center of the clamping shell. The centering shoulders on the circumference of the inner recess and the clamping shoulders on the bottom of the inner recess thus sit at the same angular position.

The diameter of the annular bearing surface corresponds to the diameter of the inner sonotrode ring.

The dowel hole with the dowel pin serves to prevent rotation and positioning of the clamping shells to each other and the position fixation of the sonotrode in the clamping shells. For this purpose, the dowel hole is inserted into the clamping shell so that it "cuts" the inner recess in the clamping shell and the circumference of the outer sonotrode ring and leaves behind a groove.

The clamping shells are aligned with each other so that the clamping shoulders of the sonotrodengewindeseitigen clamping shell and the terminal strips of sonotrodenformflächenseitigen clamping shell exactly opposite, the sonotrode is adjusted within the clamping shells so that the outer sonotrode each in height of the end portion of a slot in pairs of the clamping shoulders and Clamping terminals is clamped and the fitting groove sits on the opposite end portion of a slot, since the vibration energy is lowest at the end portions of the slots.

Surprisingly, it has been found that limited vibration-free regions result at the outer sonotrode ring in the end regions of the slots. In these areas, the clamping shoulders and clamping strips start and clamp the sonotrode only at these vibration-free areas, so that a low-vibration mounting and centering is achieved.

The dowel pin in conjunction with the dowel holes in the clamping shells adjusts the clamping shells and the sonotrode reproducibly in this position.

To complete the sonotrode arrangement, the clamping shells are pushed onto the sonotrode and fixed, but releasably connected together, z. B. screwed and hold and adjust the sonotrode almost like in a housing. The sonotrodenformflächenseitige clamping shell dives without play in the outer recess of the sonotrodengewindeseitigen clamping shell and is centered.

The sonotrode rests with its outer sonotrode ring on the clamping shoulders on the bottom of the inner recess of the sonotrodengewindeseitigen clamping shell and is characterized by the Centering shoulders centered on the circumference of the inner recess. The inner sonotrode ring lies completely against the annular bearing surface on the bottom of the inner recess and is supported there. The clamping strips of the sonotrodenformflächenseitigen clamping shell clamp the sonotrode only on the outer sonotrode ring, so that the sonotrode quasi in the outer sonotrode ring "hangs" and can swing freely. A force acting on the Sonotrodenformflächenseite force is compensated by the annular bearing surface for the inner sonotrode ring.

The clamping shells, the sonotrode and the dowel hole with the dowel pin are arranged to each other, that the clamping shoulders and the terminal strips are opposite and tension the sonotrode each in the end of a slot and that the dowel hole is located with the dowel pin on the opposite end of a slot.

The invention will be explained in more detail using an exemplary embodiment.

A sonotrode arrangement for use in an injection molding tool is described. Here, the introduction of ultrasonic energy into the cavity of an injection mold during the molding process to improve the mechanical properties of injection moldings, especially in Bindenahtbereich or to improve the flow behavior of the plastic melt contribute.

Show it:

1 Sonotrode arrangement in longitudinal section

2 Sonotrode in top view

3 Longitudinal section of the sonotrode along the line AA

4 Sonotrodenformflächenseitige clamping shell

5 Longitudinal section of the clamping shell according to the line AA

6 sonotrode thread-side clamping shell

7 Longitudinal section of the clamping shell according to the line AA

The sonotrode arrangement is from the sonotrode 1 , the sonotrodenformflächenseitigen clamping shell 2 and the sonotrode thread side clamping cup 3 built up, 1 , The clamping shell 2 is from the mold surface end to the sonotrode 1 deferred and comes on the Bund of the sonotrode 1 to the plant. From the thread end of the sonotrode 1 here is the clamping shell 3 on the sonotrode 1 deferred, with the fret of the sonotrode 1 and the clamping shell 2 each in annular recesses in the clamping shell 3 dive in and come to the plant. The clamping shells 2 and 3 are firmly screwed together without touching each other at the end faces and thus tension the sonotrode 1 , Between the end faces remains a gap.

The sonotrode 1 has at the oscillation zero point a collar, with three offset by 120 °, concentric and radially arranged slots 4 is provided by webs 5 be interrupted in their radial course, so that an outer sonotrode ring 6 and an inner sonotrode ring 7 arise, with the inner sonotrode ring 7 completely with the sonotrode 1 and the outer sonotrode ring 6 only three bridges 5 with the inner sonotrode ring 7 and thus with the sonotrode 1 connected is, 2 and 3 ,

At the circumference of the outer sonotrode ring 6 is a passport 8th arranged at a defined location.

After the 4 and 5 is the clamping cup 2 a cylindrical, stepped, flat disc with three on a pitch circle near the outer diameter offset by 120 ° threaded holes 9 , Likewise is a dowel hole 10 in the clamping shell 2 introduced, for the correct position fixation of the sonotrode 1 inside the clamping shells 2 and 3 and the two clamping shells 2 and 3 serves each other.

Starting from the threaded holes 9 each run a raised, rectangular terminal block 11 converging on the middle of the clamping shell 2 to and ends at a defined distance in front of the through hole 12 in the clamping shell 2 , The terminal strips 11 are on the Sonotrodenbund facing side of the clamping shell 2 arranged.

The diameter of the through hole 12 in the clamping shell 2 and the diameter of the sonotrode 1 At the mold-side end are coordinated so that a uniform, circumferential gap is formed, which is so large that the sonotrode 1 can vibrate freely, but is so small that an intrusion of plastic melt, even under high pressure, z. B. the injection pressure, is not possible.

The outer diameter of the clamping shell 2 is sized so that it is free of play in the outer recess 13 the clamping shell 3 can dive in and be centered there, 1 . 7 ,

The sonotrode thread side clamping shell 3 . 6 and 7 , has a through hole 14 for the sonotrode 1 , wherein the diameter of the through hole 14 and the diameter of the sonotrode 1 are matched at the thread-side end so that a uniform, circumferential gap is formed, which corresponds dimensionally but a generous clearance, 1 ,

Concentric to the through hole 14 are of the Sonotrodenbund facing side of the clamping shell 3 ago an annular outer Ausnehnung 13 and another, lower-lying annular inner recess 15 arranged. From the scope of this inner recess 15 protrude three arranged by 120 ° offset centering shoulders 16 for the sonotrode 1 out. Suitable and corresponding to the threaded holes 9 in the clamping shell 2 are in the clamping cup 3 three bolt holes offset by 120 ° 17 and a dowel hole 10 ' einbracht.

At the bottom of the inner recess 15 There are three offset by 120 ° offset clamping shoulders 18 and a circular bearing surface 19 , concentric to the through hole 14 runs. The clamping shoulders 18 and the bearing surface 19 are sublime and stick out of the ground.

The screw holes 17 , the centering shoulders 16 and the clamping shoulders 18 lie respectively on the same lines that converge to the center of the clamping shell 3 run. The clamping shoulders 18 close, running on the ground, to the centering shoulders 16 on and open into the annular bearing surface 19 , The centering shoulders 16 and the clamping shoulders 18 in the inner recess 15 sit with it at the same angular position.

The diameter of the support surface 19 corresponds dimensionally to the diameter of the inner sonotrode ring 7 ,

The dowel holes 10 and 10 ' in the clamping shells 2 and 3 and the dowel pin 20 . 1 , serve to prevent rotation and positioning of the clamping shells 2 and 3 and the sonotrode 1 to each other.

To complete the sonotrode arrangement is the sonotrode 1 with its thread-side end in the clamping shell 3 plugged in, taking with the passport groove 8th at the passport 20 in the clamping shell 3 is guided along, so that the outer sonotrode ring 6 doing so in the inner recess 15 the clamping shell 3 immersed and play-free and in the form of a press fit on the centering shoulders 16 is applied.

At the same time lies the outer sonotrode ring 6 only on the clamping shoulders 18 on, raised on the floor of the inner recess 15 run.

The inner sonotrode ring 7 lies completely on the annular bearing surface 19 and is supported there.

For fixing the sonotrode 1 becomes the clamping shell 2 on the mold-side end of the sonotrode 1 attached, wherein the lateral surface of the clamping shell 2 in the outer recess 13 the clamping shell 3 dips without play and the terminal strips 11 only the outer sonotrode ring 6 terminals.

The inner sonotrode ring 7 lies exclusively on the annular bearing surface 19 the clamping shell 3 on and will not be clamped.

Likewise, the dowel dives 20 in the dowel hole 10 the clamping shell 2 a, whereby a true-to-scale positioning of the clamping shells 2 and 3 is achieved to each other.

A true-to-scale positioning of the clamping shells 2 and 3 to each other, ie that the terminal strips 11 the clamping shell 2 and the clamping shoulders 18 the clamping shell 3 exactly opposite and only the outer sonotrode ring 6 clamp at three defined locations.

The diameter of the through hole 12 in the clamping shell 2 and the outer diameter of the sonotrode 1 on the molding surface side are coordinated so that a circumferential, uniform, minimal gap is formed, which is so large that the sonotrode 1 can swing freely.

By this sonotrode arrangement is achieved that on the molding surface of the sonotrode 1 acting great forces from the inner sonotrode ring 7 and also partly from the terminal points on the outer sonotrode ring 6 in the area of the clamping shoulders 18 be recorded.

To the vibration damping caused by the clamping of the sonotrode 1 arises, to minimize, becomes the sonotrode 1 only on its outer sonotrode ring 6 clamped and can in all other areas, especially the complete inner sonotrode ring 7 , swing freely.

For this purpose, the clamping surface on the clamping shoulders in the area 18 and centering shoulders 16 limited to adjacent surfaces. The clamping points are located on the outer sonotrode ring 6 each at the end portions of the slots 4 where the clamping shoulders 18 in cooperation with the terminal strips 11 the clamping action and fixation of the sonotrode 1 cause.

In the end region of a slot, a clamping point opposite, is on the circumference of the outer sonotrode ring 6 the passport 8th incorporated with the dowel pin 20 corresponds.

The arrangement and the interaction of the fitting groove 8th and the pass pin 20 enable and secure that sonotrode 1 when assembling the sonotrode arrangement and in function always in the exact position in the clamping shells 3 and 2 is fixed.

The solution according to the invention provides a Sonotrodenandordnung in which the longitudinal and transverse vibrations of the sonotrode are not hindered and a low-loss introduction or transmission of the vibration energy in the workpiece or the material is possible.

LIST OF REFERENCE NUMBERS

1

sonotrode

2

Sonotrodenformflächenseitige clamping shell sonotrodengewindeseitige clamping shell

4

slots

5

Stege

6

outer sonotrode ring

7

inner sonotrode ring

8th

fitting groove

9

threaded hole

10/10 '

Dowel pin hole

11

terminal block

12

Through Hole

13

outer recess

14

Through Hole

15

inner recess

16

centering

17

screw hole

18

clamping shoulder

19

annular bearing surface

20

dowel

Claims (2)

Sonotrode arrangement for Kunststoffbe- and -verarbeitungswerkzeuge such as for use in ultrasonic welding, cutting, punching or as in injection molds for influencing the plastic melt by ultrasound, with the ultrasound low-loss transferred to the workpieces to be machined or can be introduced into the plastic melt, consisting of a sonotrode and means for clamping the sonotrode, characterized in that a sonotrode ( 1 ) between a sonotrodenformflächenseitigen clamping shell ( 2 ) and a sonotrodengewindesendigen clamping shell ( 3 ), which are permanently but detachably connected to each other, is tensioned and that the sonotrode ( 1 ) has a collar in the vibration node, which with concentrically and radially arranged slots ( 4 ) provided by webs ( 5 ) are interrupted in their radial course, so that an outer sonotrode ring ( 6 ) and an inner sonotrode ring ( 7 ) and that the inner sonotrode ring ( 7 ) completely with the sonotrode ( 1 ) and the outer sonotrode ring ( 6 ) over bridges ( 5 ) with the inner sonotrode ring ( 7 ) and that at the periphery of the outer sonotrode ring ( 6 ) in the end region of a slot ( 4 ) a passport ( 8th ) is arranged that the sonotrodenformflächenseitige clamping shell ( 2 ) a cylindrical, flat disc with two or more on a pitch circle, close to the outer diameter, evenly distributed tapped holes ( 9 ) is that the sonotrodenformflächenseitige clamping shell ( 2 ) a dowel hole ( 10 ) and that in the middle in the sonotrodenformflächenseitigen clamping shell ( 2 ) a through hole ( 12 ) is arranged such that on the clamping side of the sonotrodenformflächenseitigen clamping shell ( 2 ), starting from the threaded holes ( 9 ) each a raised terminal block ( 11 ) converges on the clamping cup center and at a defined distance in front of the through hole ( 12 ) and that between the sonotrode ( 1 ) at the mold-side end and the passage bore ( 12 ) remains a uniform, circumferential gap, which is only so large that the sonotrode ( 1 ) can swing freely and that the outer diameter of the sonotrodenformflächigen side clamping shell ( 2 ) is dimensioned so that the sonotrodenformflächenseitige clamping shell ( 2 ) play in an outer recess ( 13 ) in the sonotrodengewindeseitigen clamping shell ( 3 ) can immerse that the sonotrodengewindesendige clamping shell ( 3 ) centrally has a through hole ( 14 ) and between the sonotrode ( 1 ) at the threaded end and the through hole ( 14 ) a uniform, circumferential gap remains, which corresponds to a generous clearance that concentric to the through hole ( 14 ) in the sonotrodengewindeseitigen clamping shell ( 3 ) from the clamping side an annular outer recess ( 13 ) and therein a further, lower-lying annular inner recess ( 15 ) are introduced, that raised at the periphery of the inner recess ( 15 ) evenly distributed two or more strip-shaped centering shoulders ( 16 ) are arranged and to the centering shoulders ( 16 ), on the bottom of the inner recess ( 15 ), raised strip-shaped clamping shoulders ( 18 ), which in an annular bearing surface ( 19 ) and that the annular bearing surface ( 19 ) concentric to the through hole ( 14 ) is arranged, that the sonotrodengewindeseitige clamping shell ( 3 ) two or more screw holes ( 17 ) and a dowel hole ( 10 ' ), which with the threaded holes ( 9 ) and the dowel hole ( 10 ) in the sonotrodenformflächenseitigen clamping shell ( 2 ) and that the sonotrode ( 1 ) only on the outside Sonotrode ring ( 6 ) in each case in an end region of a slot ( 4 ) is clamped and the passport ( 8th ) in a clamping area opposite end portion of a slot ( 4 ) is arranged. Sonotrode arrangement for plastic processing and processing tools according to claim 1, characterized in that the collar of the sonotrode ( 1 ) three slots offset by 120 °, concentric and radially arranged slots ( 4 ) and that the outer sonotrode ring ( 6 ) over three bridges ( 5 ) with the inner sonotrode ring ( 7 ), that the sonotrodenformflächenseitige clamping shell ( 2 ) three offset by 120 ° threaded holes ( 9 ) and the sonotrodengewindesige clamping shell ( 3 ) three offset by 120 ° arranged screw holes ( 17 ), which correspond to each other, that the sonotrodenformflächenseitige clamping shell ( 2 ) three offset by 120 ° arranged terminal strips ( 11 ) and the sonotrode thread-side clamping shell ( 3 ) three offset by 120 ° centering shoulders ( 16 ) and three clamping shoulders ( 18 ) and that the diameter of the annular bearing surface ( 19 ) the diameter of the inner sonotrode ring ( 7 ) corresponds.

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