EP0625086B1 - Perfectionnements des dispositifs de decoupe - Google Patents

Perfectionnements des dispositifs de decoupe Download PDF

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Publication number
EP0625086B1
EP0625086B1 EP93902457A EP93902457A EP0625086B1 EP 0625086 B1 EP0625086 B1 EP 0625086B1 EP 93902457 A EP93902457 A EP 93902457A EP 93902457 A EP93902457 A EP 93902457A EP 0625086 B1 EP0625086 B1 EP 0625086B1
Authority
EP
European Patent Office
Prior art keywords
cutting
cutting device
cutting member
face
cutting edge
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.)
Expired - Lifetime
Application number
EP93902457A
Other languages
German (de)
English (en)
Other versions
EP0625086A1 (fr
Inventor
Francis Frederick Hamilton Rawson
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0625086A1 publication Critical patent/EP0625086A1/fr
Application granted granted Critical
Publication of EP0625086B1 publication Critical patent/EP0625086B1/fr
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/086—Means for treating work or cutting member to facilitate cutting by vibrating, e.g. ultrasonically

Definitions

  • This invention is concerned with improvements relating to cutting devices, particularly cutting devices which are operative at high (ultrasonic) frequency.
  • a cutting device comprising:
  • the cutting member whilst being generally annular, is provided in its outer surface with “flats”, or surfaces curved on different centres.
  • the centre of the annulus constitutes a theoretical anti-node, and vibration will occur alternately radially outwardly and inwardly from the centre of the annulus, so that the cutting member effects a "pulsation".
  • the cutting edge may subtend at an angle of between 45° and 270°, although in practise a cutting edge above 180° is unlikely to be of wide value, and preferably the range of the cutting edge is between 60° and 160°, with a cutting edge vibrating radially of the annular cutting member.
  • the cutting edge may be V-shape in cross-section, or two parallel cutting edges may be provided by machining a V-shape or U-shape groove into circumference of the cutting member at least over the circumferential distance thereof required to perform a cutting operation.
  • Such a cutting device may be used for cutting brittle and hard materials, such a ceramics or concrete, or soft materials, such as fabric, or foodstuffs.
  • Equation (1) is a well known Bessel equation and a discrete solution is obtained for radial motion (after Watson 1962 Theory of Bessel Functions; London, Cambridge University Press) for an annular ring with inner and outer radii R1 and R2 or at R1 and R2 with zero stress.
  • K(R1 + R2) 2n
  • n is an integer, which means that radial motion occurs when the mean circumference of the annular ring (R1 + R2) is equal to an integral number of wavelengths.
  • the analysis shows that radial motion is independent of disc thickness.
  • Finite Element modelling eg PAFEC'S FEA Computer Programmes, Nottingham, UK
  • the disc dimensions now enables the disc dimensions to be calculated to show that the radial mode vibration of a disc 150 mm outer and 50 mm inner diameter, and of aluminium with 4% copper alloy giving vibrational frequency of 18.2 kHz.
  • the device may comprise a plurality of cutting members secured (e.g. by welding or bolting) in parallel array to a single drive member, to enable a plurality of parallel cuts to be produced simultaneously.
  • the device which is the first embodiment of the invention comprises an annular cutting member 6 having an inner radius of 50mm and an outer radius of 150mm, the cutting member being of aluminium with 4% copper alloy.
  • the member 6 is provided with a flat drive face 8 on one side of diametral plane, by which the cutting member is attached to an ultrasonic horn 10 providing a source of ultrasonic vibrations at a frequency of 18.2 kHz.
  • the face 8 will constitute an anti-node (portion of maximum displacement) and the centre of the aperture 12 of the member 6 providing a theoretical node. With such a construction, the member 6 vibrates radially inwardly and outwardly, as shown by the arrows, in a pulsating manner.
  • the member 6 is provided with a circumferential cutting edge 14 subtending an angle of about 180° at the centre of the member which in the operation of the drive vibrates at a substantially uniform amplitude, allowing when the device is moved in the direction of the arrow A through a substrate 18, a cutting action to be effected.
  • parallel cutting edges 20 a , 20 b are afforded by the provision of a generally U-shape groove or channel into the circumferential edge of the cutting member, to enable twin cutting tracks to be provided.
  • a plurality, specifically three cutting member 6 a , 6 b , 6 c are connected in parallel to a multi-stage ultrasonic horn 28, whereby the cutting edges 14 are all caused to vibrate together, enabling a multiple cut to be obtained in the substrate.
  • the cutting member is annular, if desired "flats" or alternatively curved faces may be provided on the other circumference.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Surgical Instruments (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)

Claims (9)

  1. Un dispositif de découpe comprenant
    (a) un élément de coupe généralement annulaire (6, 6a, 6b, 6c) ayant sur un côté d'un plan diamétral une face d'entraînement (8) à lier à une source (10) de vibrations ultrasoniques, lesdites vibrations agissant suivant une direction radiale à l'élément ; et
    (b) un bord de coupe (14, 20a, 20b) s'étendant à la périphérie de l'élément de coupe (6) sur l'autre côté dudit plan diamétral.
  2. Un dispositif de découpe conforme à la Revendication 1 dans lequel l'élément de coupe est muni sur sa surface externe d'un méplat, ou d'une surface courbe sur un centre différent, constituant ladite face d'entraînement (8).
  3. Un dispositif de découpe conforme à l'une des Revendications 1 et 2 dans lequel le bord de coupe sous-tend un angle entre 45° et 270°, de préférence entre 60° et 160°.
  4. Un dispositif de découpe conforme à l'une quelconque des revendications précédentes dans lequel le bord de coupe a une forme en V en section transversale.
  5. Un dispositif de découpe conforme à l'une quelconque des Revendications 1, 2 et 3 dans lequel des bords de coupe parallèles (20a, 20b) sont ménagés par usinage d'une rainure en forme de V ou en forme de U à la périphérie de l'élément de coupe au moins sur une partie de la distance périphérique de celui-ci.
  6. Un dispositif de découpe conforme à l'une quelconque des revendications précédentes, comprenant une pluralité d'éléments de coupe (6a, 6b, 6c) fixés en rangée parallèle à un élément d'entraînement unique (28).
  7. Un dispositif de découpe conforme à l'une quelconque des revendications précédentes dans lequel les valeurs du rayon interne R1 et du rayon externe R2 sont en accord approximativement avec l'équation K (R1 + R2) = 2N.
  8. Un dispositif de découpe conforme à la Revendication 7 dans lequel ladite approximation est à plus/moins 5 % près.
  9. Un mécanisme de découpe comprenant un dispositif de découpe conforme à l'une quelconque des revendications précédentes et un dispositif ultrasonique (10) lié à une face d'entraînement plate (8) sur la périphérie du dispositif de découpe avec un bord de coupe s'étendant à la périphérie (14, 20) localisé généralement à l'opposé de la face d'entraînement.
EP93902457A 1992-01-28 1993-01-25 Perfectionnements des dispositifs de decoupe Expired - Lifetime EP0625086B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB929201785A GB9201785D0 (en) 1992-01-28 1992-01-28 Improvements relating to cutting devices
GB9201785 1992-01-28
PCT/GB1993/000159 WO1993014912A1 (fr) 1992-01-28 1993-01-25 Perfectionnements des dispositifs de decoupe

Publications (2)

Publication Number Publication Date
EP0625086A1 EP0625086A1 (fr) 1994-11-23
EP0625086B1 true EP0625086B1 (fr) 1997-04-02

Family

ID=10709381

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93902457A Expired - Lifetime EP0625086B1 (fr) 1992-01-28 1993-01-25 Perfectionnements des dispositifs de decoupe

Country Status (6)

Country Link
EP (1) EP0625086B1 (fr)
AT (1) ATE151004T1 (fr)
AU (1) AU3363693A (fr)
DE (1) DE69309445T2 (fr)
GB (1) GB9201785D0 (fr)
WO (1) WO1993014912A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2282559B (en) * 1993-10-07 1998-04-15 Rawson Francis F H Ultrasonic cutting device
GB9610417D0 (en) * 1996-05-17 1996-07-24 Rawson Francis F H Horn tuning and adjustment
GB2325192B (en) * 1997-05-16 2001-03-07 Rawson Francis F H Cutting devices
GB9711538D0 (en) * 1997-06-05 1997-07-30 Rawson Francis F H Improvements relating to cutting devices
GB2325874B (en) * 1997-06-05 2000-08-16 Rawson Francis F H Ultrasonic cutting device
DE102022102942A1 (de) 2022-02-08 2023-08-10 Herrmann Ultraschalltechnik Gmbh & Co. Kg Schneidsonotrode für das Schneiden von Kautschukbahnen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4373412A (en) * 1980-07-10 1983-02-15 Gerber Garment Technology, Inc. Method and apparatus for cutting sheet material with a cutting wheel
GB2219245A (en) * 1988-06-03 1989-12-06 Rawson Francis F H Ultrasonic cutting

Also Published As

Publication number Publication date
DE69309445D1 (de) 1997-05-07
EP0625086A1 (fr) 1994-11-23
ATE151004T1 (de) 1997-04-15
GB9201785D0 (en) 1992-03-11
WO1993014912A1 (fr) 1993-08-05
DE69309445T2 (de) 1997-10-30
AU3363693A (en) 1993-09-01

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