Sonotrode having optimized slot geometry

Patent metadata

Field	Value
Publication number	US-12465949-B2
Application number	US-202318727829-A
Country	US
Kind code	B2
Filing date	Jan 9, 2023
Priority date	Jan 11, 2022
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

An ultrasonic vibration element which vibrates with a longitudinal ultrasonic vibration, the vibration unit is bounded in the longitudinal direction by a rear face and a front face, the front face is either intended to come into contact with a further vibration element or is designed as a sealing surface or adjoins a sealing surface which comes into contact with a material to be processed, wherein a circumferential lateral surface is provided, which connects the rear surface and the front face, the vibration element has a slit in the lateral surface, the slit has a slit length, a slit width and a slit depth, the slit depth being selected such that the slit completely penetrates the ultrasonic element, and the slit length being greater than the slit width, wherein the slit is not axially symmetrical to a slit longitudinal axis.

First claim

What is claimed is:

1 . An ultrasonic vibration element which can be set into resonant vibration with a longitudinal ultrasonic vibration in a longitudinal direction,
wherein the ultrasonic vibration element is bounded in the longitudinal direction on one hand by a rear face and on another hand by a front face, wherein the front face is either intended to come into contact with a further ultrasonic vibration element in order to transmit the ultrasonic vibration to the further ultrasonic vibration element, or is designed as a sealing surface or adjoins a sealing surface which is intended to come into contact with a material to be processed and to transmit the ultrasonic vibration to the material to be processed, wherein a circumferential lateral surface is provided, which connects the rear face and the front face to one another, wherein the ultrasonic vibration element has a slit in the lateral surface, wherein the slit has a slit length I in a slit longitudinal direction, a slit width b in a slit transverse direction and a slit depth t in a slit depth direction, the slit longitudinal direction, the slit transverse direction and the slit depth direction being arranged orthogonally to one another, the slit depth t being selected such that the slit completely penetrates the ultrasonic element, and the slit length I being greater than the slit width b, wherein the slit is not axially symmetrical to a slit longitudinal axis along the slit longitudinal direction in a sectional view, wherein the slit is bounded by two longitudinal walls and two cross walls, a first of the two longitudinal walls is at least in sections further away from the slit longitudinal axis than a second of the two longitudinal walls, and wherein the slit is produced by first producing a slit with two parallel longitudinal walls and then making a recess in the first longitudinal wall.

2 . The ultrasonic vibration element according to claim 1 , wherein the slit longitudinal direction and the longitudinal direction enclose an angle which is less than 25°, or less than 5°, or 0°.

3 . The ultrasonic vibration element according to claim 2 , wherein four slits are provided, two of the four slits being arranged axially symmetrically to an axis along the longitudinal direction, and wherein the ultrasonic vibration element has a first, second and third section, the first section having a thickness which is smaller than a thickness of the third section, wherein the second section has a varying thickness and connects the first to the third section.

4 . The ultrasonic vibration element according to claim 3 , wherein the first section has a sealing surface which is intended to come into contact with a material to be processed, and wherein the third section has a recess in which at least one piezo element is arranged.

5 . The ultrasonic vibration element according to claim 4 , wherein the first longitudinal wall is arranged further away from a center axis of the ultrasonic vibration element extending in the longitudinal direction than the second longitudinal wall, and wherein the two cross walls are concavely curved.

6 . The ultrasonic vibration element according to 5 , wherein the first longitudinal wall is concavely curved at least in sections.

7 . The ultrasonic vibration element according to claim 2 , wherein two slits are provided, the two slits being arranged axially symmetrically to an axis along the longitudinal direction.

8 . The ultrasonic vibration element according to claim 1 , wherein two slits are provided, the two slits being arranged axially symmetrically to an axis along the longitudinal direction.

9 . The ultrasonic vibration element according to claim 8 , wherein the ultrasonic vibration element has a first, second and third section, the first section having a thickness which is smaller than a thickness of the third section, wherein the second section has a varying thickness and connects the first to the third section.

10 . The ultrasonic vibration element according to claim 9 , wherein the first section has a sealing surface which is intended to come into contact with a material to be processed.

11 . The ultrasonic vibration element according to claim 10 , wherein the third section has a recess in which at least one piezo element is arranged.

12 . The ultrasonic vibration element according to claim 9 , wherein the third section has a recess in which at least one piezo element is arranged.

13 . The ultrasonic vibration element according to claim 8 , wherein four slits are provided, two of the four slits being arranged axially symmetrically to an axis along the longitudinal direction.

14 . The ultrasonic vibration element according to claim 13 , wherein the ultrasonic vibration element has a first, second and third section, the first section having a thickness which is smaller than a thickness of the third section, wherein the second section has a varying thickness and connects the first to the third section.

15 . The ultrasonic vibration element according to claim 1 , wherein the first longitudinal wall is arranged further away from a center axis of the ultrasonic vibration element extending in the longitudinal direction than the second longitudinal wall.

16 . The ultrasonic vibration element according to claim 15 , wherein the two cross walls are concavely curved.

17 . The ultrasonic vibration element according to 16 , wherein the first longitudinal wall is concavely curved at least in sections.

18 . The ultrasonic vibration element according to claim 16 , wherein the two cross walls are curved with the same radius of curvature.

19 . The ultrasonic vibration element according to 15 , wherein the first longitudinal wall is concavely curved at least in sections.

20 . An ultrasonic vibration element which can be set into resonant vibration with a longitudinal ultrasonic vibration in a longitudinal direction,
wherein the ultrasonic vibration element is bounded in the longitudinal direction on one hand by a rear face and on another hand by a front face, wherein the front face is either intended to come into contact with a further ultrasonic vibration element in order to transmit the ultrasonic vibration to the further ultrasonic vibration element, or is designed as a sealing surface or adjoins a sealing surface which is intended to come into contact with a material to be processed and to transmit the ultrasonic vibration to the material to be processed, wherein a circumferential lateral surface is provided, which connects the rear face and the front face to one another, wherein the ultrasonic vibration element has a slit in the lateral surface, wherein the slit has a slit length I in a slit longitudinal direction, a slit width b in a slit transverse direction and a slit depth t in a slit depth direction, the slit longitudinal direction, the slit transverse direction and the slit depth direction being arranged orthogonally to one another, the slit depth t being selected such that the slit completely penetrates the ultrasonic element, and the slit length I being greater than the slit width b, wherein the slit is not axially symmetrical to a slit longitudinal axis along the slit longitudinal direction in a sectional view, and wherein the slit is bounded by two longitudinal walls and two cross walls, wherein the two longitudinal walls are parallel to each other, and a first of the two longitudinal walls has a recess that is located further away from the slit longitudinal axis than a second of the two longitudinal

Assignees

• Herrmann Ultraschalltechnik Gmbh & Co Kg

Inventors

• Schweitzer Matthias

Classifications

• B29C66/8145

  characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps (B29C66/816 and B29C66/818 take precedence; adaptable for making articles or joints of different dimensions B29C66/841) · CPC title

• B29C66/43

  Joining a relatively small portion of the surface of said articles (B29C66/45 takes precedence) · CPC title

• B29C66/1122

  Single lap to lap joints, i.e. overlap joints (B29C66/45, B29C66/472, B29C66/52272 take precedence) · CPC title

• B23K20/106

  Features related to sonotrodes · CPC title

• B29C65/08

  using ultrasonic vibrations {(non-plastics element to plastics elements B29C65/645)} · CPC title