FR2579123A1 - Tool for machining components by ultrasound vibrations - Google Patents

Tool for machining components by ultrasound vibrations Download PDF

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Publication number
FR2579123A1
FR2579123A1 FR8604006A FR8604006A FR2579123A1 FR 2579123 A1 FR2579123 A1 FR 2579123A1 FR 8604006 A FR8604006 A FR 8604006A FR 8604006 A FR8604006 A FR 8604006A FR 2579123 A1 FR2579123 A1 FR 2579123A1
Authority
FR
France
Prior art keywords
sonotrode
tool
machining
crown
cone
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
FR8604006A
Other languages
French (fr)
Inventor
Michael Bory
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.)
DIETER HANSEN AG
Original Assignee
DIETER HANSEN 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 DIETER HANSEN AG filed Critical DIETER HANSEN AG
Publication of FR2579123A1 publication Critical patent/FR2579123A1/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • 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
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/0009—Energy-transferring means or control lines for movable machine parts; Control panels or boxes; Control parts
    • B23Q1/0018—Energy-transferring means or control lines for movable machine parts; Control panels or boxes; Control parts comprising hydraulic means
    • B23Q1/0027—Energy-transferring means or control lines for movable machine parts; Control panels or boxes; Control parts comprising hydraulic means between moving parts between which an uninterrupted energy-transfer connection is maintained
    • B23Q1/0036—Energy-transferring means or control lines for movable machine parts; Control panels or boxes; Control parts comprising hydraulic means between moving parts between which an uninterrupted energy-transfer connection is maintained one of those parts being a tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • B24B1/04—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes subjecting the grinding or polishing tools, the abrading or polishing medium or work to vibration, e.g. grinding with ultrasonic frequency
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

Tool for machining components by ultrasound vibrations. The tool comprises a machining ring 2 fixed to a sonotrode 1 via a tapered connection 3, 4 with automatic locking. Application particularly for machining components made from particularly hard materials.

Description

Un article intitulé "Ultrasonic Machining of Intractable Materials (Usinage, par ultra-sons, de matériaux "irltruitables") de A.I. Markov, publié par Ilifft Books LCU,
Dorset House, Stamford Street, Londres S.E. 1 (1966),indique plusieurs manières possibles de fixer amoviblement une couronne d'usinage à une sonotrode (émetteur d'ultra-sons).An article entitled "Ultrasonic Machining of Intractable Materials" by AI Markov, published by Ilifft Books LCU,
Dorset House, Stamford Street, London SE 1 (1966), indicates several possible ways of removably fixing a machining crown to a sonotrode (emitter of ultrasound).

Il est donc connu de visser la couronne sur la sonotrode.It is therefore known to screw the crown onto the sonotrode.

Mais il n'est alors pas possible d'assurer un alignement exact de cette couronne, si bien qu'il faut l'ajuster après chaque remplacement. Par ailleurs, ce mode de jonction ne convient pas avec des couronnes ayant une grosse masse. Les jonctions par soudure à l'étain ont en général les mêmes défauts que les jonctions par vissage. On utilise surtout pour ces jonctions un brasage dur qui convient pour les fortes charges, C'est-à-dire les vibrations de grande amplitude.But it is then not possible to ensure an exact alignment of this crown, so that it must be adjusted after each replacement. Furthermore, this method of joining is not suitable for crowns with a large mass. Tin solder joints generally have the same defects as screw connections. Above all, hard brazing is used for these junctions which is suitable for heavy loads, that is to say vibrations of great amplitude.

La couronne est susceptible de gauchir pendant le brasage, de sorte qu'il est souvent nécessaire de l'usiner par enlève- ment de copeaux après cette opération. Par ailleurs, il est connu du fait de l'article précité de joindrela couronne et la sonotrode par emmanchement à chaud. Ce mode de jonction a les memes défauts que la jonction par brasage. Enfin, il est connu de fixer la couronne au moyen d'un écrou-chapeau. The crown is likely to warp during soldering, so it is often necessary to machine it by removing chips after this operation. Furthermore, it is known from the above article to join the crown and the horn by hot fitting. This method of joining has the same shortcomings as joining by brazing. Finally, it is known to fix the crown by means of a cap nut.

Il est alors difficile de réaliser un contact acoustique sur. La masse relativement grande de l'écrou-chapeau provoque des pertes, de sorte que cette fixation ne convient que pour des couronnes de.faible diamètre.It is then difficult to make an acoustic contact on. The relatively large mass of the cap nut causes losses, so that this fixing is only suitable for crowns of small diameter.

L'invention a pour but de réaliser une jonction amoviblP entre sonotrode et couronne qui ne présente pas les inconvéniPnts ci-dessus, qui soit aussi aisément interchangPablP et avec laquelle l'outil n'ait pas à Entre ajusté ni rCusiiC' apres le remplacement.  The invention aims to achieve a removable junction between sonotrode and crown which does not have the above disadviPnts, which is also easily interchangPablP and with which the tool does not have to be adjusted or rCusiiC 'after replacement.

ronformement à l'invention, la couronne est reliéP à la sunotrode par l'intermédiaire d'un cône ou d'un co-in à blocage automatique. In accordance with the invention, the crown is connected to the sunotrode via a cone or a self-locking co-in.

Il est connu pour les perceuses de fixer la mèche à l'arbre au moyen d'un cône à blocage automatique. Mais, dans cette application,les efforts axiaux agissent toujours dans le sens du serrage. On ne pensait pas jusqu'à présent que ce mode de fixation puisse convenir aussi pour les outils à vibrations ultrasoniques, avec lesquels les effort axiale importants d'accélération, qui sont en général un tultiple de l'effort axial moyen de la pièceJsont aussi élevés dans le sens du desserrage que dans celui du serrage.Mais des essais ont établi de manière surprenante que la jonction conique convient aussi dans les conditions de service compietement différentes de l'usinage de pièces par vibrations ultrasoniques, si les frottements créés par la jonction et la masse de la couronne sont dans un rapport approprié. It is known for drills to fix the drill bit to the shaft by means of an automatically locking cone. However, in this application, the axial forces always act in the direction of tightening. Until now, it was not thought that this method of fixing could also be suitable for tools with ultrasonic vibrations, with which the significant axial forces of acceleration, which are generally a multiplier of the average axial force of the part, are also high. in the direction of loosening than in that of tightening. But tests have surprisingly established that the conical junction is also suitable in service conditions completely different from the machining of parts by ultrasonic vibrations, if the friction created by the junction and the mass of the crown are in an appropriate ratio.

L'invention va être décrite en détail en regard du dessin annexe à titre d'exemples nullement limitatifs, sur lequel
la figure 1 représente une première forme de réalisation
la figure 2 est une coupe axiale d'une seconde forme de réalisation
les figures 3 et 4 sont une coupe axiale et une vue en bout d'une troisième forme de réalisation ; et
les figures 5 et 6 sont un plan et une élévation d'une quatrième forme de réalisation.The invention will be described in detail with reference to the accompanying drawing by way of non-limiting examples, in which
Figure 1 shows a first embodiment
Figure 2 is an axial section of a second embodiment
Figures 3 and 4 are an axial section and an end view of a third embodiment; and
Figures 5 and 6 are a plan and elevation of a fourth embodiment.

L'outil d'usinage par vibrations ultrasoniques de la figure 1 est composé d'une sonotrode 1 et d'une couronneoutil 2. En service, la sonotrode 1 est vissée au moyen d'un embout fileté 5 sur un amplificateur, qui est relié à un convertisseur piézoélectrique destiné à créer des vibrations ultrasoniques longitudinales. La face plane 6 transmet ces vibrations à la sonotrode 1. Celle-ci est amincie vers son extrémité libre si bien qu'à cette extrémité l'amplitude des vibrations Pst plus grande que sur la face 6 de jonction. The ultrasonic vibration machining tool of FIG. 1 is composed of a sonotrode 1 and a crown tool 2. In operation, the sonotrode 1 is screwed by means of a threaded end piece 5 on an amplifier, which is connected to a piezoelectric converter intended to create longitudinal ultrasonic vibrations. The flat face 6 transmits these vibrations to the sonotrode 1. The latter is thinned towards its free end so that at this end the amplitude of the vibrations Pst greater than on the junction face 6.

Ladite extrémité de la sonotrode 1 comporte un cône extérieur 3 lisse ayant par exemple un angle d'ouverture égal à 1/50.Said end of the horn 1 comprises a smooth outer cone 3 having for example an opening angle equal to 1/50.

La couronp 2 comporte un cône intérieur 4 complémen taie, avec lequel elle est emmanchéP sLr le cône 3. L'ajus tement conique réalise un blocage automatique. Cette couronne 2 se compose d'un élément d'ajustement O renforcé et d'un élément 9 Jiilia(e en forme de douille, à surface d'extrémité 8 plane. The crown 2 has an inner cone 4 complementary cover, with which it is fitted on the cone 3. The conical adjustment realizes an automatic blocking. This crown 2 is composed of a reinforced adjustment element O and of an element 9 Jiilia (e in the form of a socket, with a flat end surface 8.

La couronne 2 peut être emmanchée sur le cône au moyen, par exemple, d'une vis centrale vissée dans la sonotrode 1. The crown 2 can be fitted onto the cone by means, for example, of a central screw screwed into the sonotrode 1.

Celle-ci comporte à cet effet des plats v de prise de clé et un taraudage axial 11. Pour effectuer le démontage, il est possible d'appliquer de l'extérieur un outil contre la face d'extrémité supérieure de cette couronne 2 et de le tirer dans le sens de l'extraction au moyen, par exemple,d'une vis appliquée contre la face d'extrémité de la sonotrode.This includes for this purpose dishes v key socket and an axial thread 11. To disassemble, it is possible to apply from the outside a tool against the upper end face of this ring 2 and pull it in the direction of extraction using, for example, a screw applied against the end face of the sonotrode.

La forme de réalisation de la figure 2 convient surtout pour des couronnes de faible diamètre. La sonotrode 1 comporte ici un cane intérieur 3 et la couronne 2 un cône extérieur 4 complémentaire. Cette sonotrode 1 est percée sur toute sa longueur d'un alésage longitudinal 12 qui permet de démonter la couronne 2 au moyen d'une broche. Afin de permettre de monter la sonotrode sur l'amplificateur, elle présente en haut un taraudage 5. Pour le reste, la forme de réalisation de la figure 2 correspond à celle de la figure 1. The embodiment of Figure 2 is especially suitable for small diameter crowns. The sonotrode 1 here comprises an inner cane 3 and the crown 2 an outer cone 4 complementary. This sonotrode 1 is pierced over its entire length with a longitudinal bore 12 which makes it possible to dismantle the crown 2 by means of a spindle. In order to allow the sonotrode to be mounted on the amplifier, it has a tapping at the top 5. For the rest, the embodiment of FIG. 2 corresponds to that of FIG. 1.

Dans la forme de réalisation des figures 3 et 4, la sonotrode 1 est cylindrique. Six alésages coniques 3, destinés à recevoir des couronnes 2 selon la figure 2, sont façonnés sur sa face d'extrémité (figure 4). Des canaux 15 font communiquer ces alésages coniques 3 avec un alésage central 16 communiquant avec un raccord 17. Cela permet d'aspirer l'émulsion abrasive pendant le travail par les couronnes creuses 2. In the embodiment of Figures 3 and 4, the sonotrode 1 is cylindrical. Six conical bores 3, intended to receive crowns 2 according to FIG. 2, are formed on its end face (FIG. 4). Channels 15 make these conical bores 3 communicate with a central bore 16 communicating with a fitting 17. This makes it possible to suck the abrasive emulsion during work by the hollow rings 2.

Cette aspiration peut aussi être effectuée avec les formes de réalisation des figures 1 et 2. This suction can also be carried out with the embodiments of FIGS. 1 and 2.

Dans la forme de réalisation des figures 5 et 6, la couronne 2 est une plaquette plane. Le siège 3' destiné à recevoir ('t'LL( couronne 2, formé dans la sonotrode 1 est cunéi- forme, ses faces étant encore inclinées l'une vers l'autre dans le rapport 1/50. Cela rend le coin autobloquant. La cou ronge 2 présente des surfaces cunéiformes 4' complémentaires à son extrémité supérieure. La sonotrode 1 est amincie en forme de coin vers son extrémité libre. In the embodiment of Figures 5 and 6, the ring 2 is a flat plate. The seat 3 'intended to receive (' t'LL (crown 2, formed in the sonotrode 1 is wedge-shaped, its faces still being inclined towards one another in the ratio 1/50. This makes the corner self-locking The girdle 2 has wedge-shaped surfaces 4 ′ complementary to its upper end The sonotrode 1 is thinned in the form of a wedge towards its free end.

La matière première appropriée pour la sonotrode 1 est par exemple un acier à grande résistance aux efforts alternés. Pour la couronne 2, il est possible d'utiliser un acier de construction 60-2 ordinaire. The raw material suitable for the sonotrode 1 is for example a steel with high resistance to alternating forces. For crown 2, ordinary 60-2 structural steel can be used.

il va de soi qu'il est possible, sans s'écarter du domaine de l'invention, d'apporter d'autres modifications aux outils d'usinage de pièces par vibrations ultrasoniques, représentés et décrits.  It goes without saying that it is possible, without departing from the scope of the invention, to make other modifications to the tools for machining parts by ultrasonic vibrations, shown and described.

Claims (3)

REVENDICATIONS 1. Outil destiné à usiner des pièces par vibrations ultrasoniques, comportant une couronne d'usinage (2) fixée amoviblement à une sonotrode (1), outil caractérisé en ce que la couronne (2) est reliée à la sonotrode (1), soit par un cône (3, 4) à blocage automatique, soit par un coin 1. Tool intended for machining parts by ultrasonic vibrations, comprising a machining ring (2) removably attached to a sonotrode (1), tool characterized in that the ring (2) is connected to the sonotrode (1), or by a cone (3, 4) with automatic locking, either by a wedge (3', 4') à blocage automatique (3 ', 4') with automatic locking 2. Outil selon la revendication 1, caractérisé en ce que l'angle d'ouverture du cône ou du coin est égal à environ 1/50. 2. Tool according to claim 1, characterized in that the opening angle of the cone or the corner is equal to about 1/50. 3. Couronne d'usinage destinée à être utilisée dans un outil selon l'une des revendications 1 et 2, caractérisée en ce qu'elle comporte une surface d'appui, soit conique (4), soit cunéiforme (4'), destinée à être reliée à la sonotrode (I).  3. Machining crown intended to be used in a tool according to one of claims 1 and 2, characterized in that it comprises a bearing surface, either conical (4), or wedge-shaped (4 '), intended to be connected to the sonotrode (I).
FR8604006A 1985-03-21 1986-03-20 Tool for machining components by ultrasound vibrations Pending FR2579123A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1261/85A CH665783A5 (en) 1985-03-21 1985-03-21 TOOL FOR ULTRASONIC MACHINING OF WORKPIECES.

Publications (1)

Publication Number Publication Date
FR2579123A1 true FR2579123A1 (en) 1986-09-26

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ID=4206254

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8604006A Pending FR2579123A1 (en) 1985-03-21 1986-03-20 Tool for machining components by ultrasound vibrations

Country Status (3)

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CH (1) CH665783A5 (en)
DE (1) DE3606304A1 (en)
FR (1) FR2579123A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2613651A1 (en) * 1987-04-10 1988-10-14 Onera (Off Nat Aerospatiale) ULTRASONIC ABRASION MACHINING MACHINE
EP0340661A2 (en) * 1988-05-03 1989-11-08 Mafell-Ultrasonics Gmbh Keramik-Erosion Apparatus for machining very hard material by means of a machining tool, and method therefor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4139119C1 (en) * 1991-11-28 1993-05-19 Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe, De Taking samples of radioactive waste in glass blocks - includes boring hole in container well, boring further into glass core, using ultrasonic boring technique, and pulling out core boring unit etc.
CH687739A5 (en) * 1992-12-12 1997-02-14 Thera Ges Fuer Patente Method and apparatus for the production of horns for the ultrasonic machining as ceramic workpieces, particularly for oral surgery.
ES2659512T3 (en) * 2004-12-13 2018-03-16 Fritz Studer Ag Tool unit for ultrasonic assisted rotary machining
DE102016101313B4 (en) * 2016-01-26 2018-05-30 HEMO GmbH Sonotrode, device, system and method for deburring workpieces with ultrasound

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR504832A (en) * 1919-11-03 1920-07-17 Henry Charles Dorez Reciprocating tool holder for filing fillings and teeth
DE1133653B (en) * 1960-07-25 1962-07-19 Gotthold Pahlitzsch Dr Ing Tool attachment to the transmitter of an ultrasonic push-lapping machine
US3133351A (en) * 1957-02-11 1964-05-19 Soundrive Engine Company Method and apparatus for sonic dental drilling
SU650666A1 (en) * 1976-11-15 1979-03-05 Вильнюсский Филиал Эекспериментального Научно-Исследовательского Института Металлорежущих Станков Shank for securing tool in the spindle
GB2016350A (en) * 1978-02-20 1979-09-26 Citizen Watch Co Ltd Ultrasonic cutting tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR504832A (en) * 1919-11-03 1920-07-17 Henry Charles Dorez Reciprocating tool holder for filing fillings and teeth
US3133351A (en) * 1957-02-11 1964-05-19 Soundrive Engine Company Method and apparatus for sonic dental drilling
DE1133653B (en) * 1960-07-25 1962-07-19 Gotthold Pahlitzsch Dr Ing Tool attachment to the transmitter of an ultrasonic push-lapping machine
SU650666A1 (en) * 1976-11-15 1979-03-05 Вильнюсский Филиал Эекспериментального Научно-Исследовательского Института Металлорежущих Станков Shank for securing tool in the spindle
GB2016350A (en) * 1978-02-20 1979-09-26 Citizen Watch Co Ltd Ultrasonic cutting tool

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SOVIET INVENTIONS ILLUSTRATED, semaine B48, 16 janvier 1980, résumé no. L1439B/48, Derwent Publications Ltd, Londres, GB; & SU-A-650 666 (VILIN METALCUT MACH) 09-03-1979 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2613651A1 (en) * 1987-04-10 1988-10-14 Onera (Off Nat Aerospatiale) ULTRASONIC ABRASION MACHINING MACHINE
EP0362449A1 (en) * 1987-04-10 1990-04-11 Office National d'Etudes et de Recherches Aérospatiales (O.N.E.R.A.) Machine tool for ultrasonic abrading
EP0340661A2 (en) * 1988-05-03 1989-11-08 Mafell-Ultrasonics Gmbh Keramik-Erosion Apparatus for machining very hard material by means of a machining tool, and method therefor
EP0340661A3 (en) * 1988-05-03 1990-12-05 Mafell-Ultrasonics Gmbh Keramik-Erosion Apparatus for machining very hard material by means of a machining tool, and method therefor

Also Published As

Publication number Publication date
CH665783A5 (en) 1988-06-15
DE3606304A1 (en) 1986-09-25

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