EP3678824A1 - Procédé et dispositif d'usinage au moyen d'un fluide haute pression - Google Patents

Procédé et dispositif d'usinage au moyen d'un fluide haute pression

Info

Publication number
EP3678824A1
EP3678824A1 EP18729421.0A EP18729421A EP3678824A1 EP 3678824 A1 EP3678824 A1 EP 3678824A1 EP 18729421 A EP18729421 A EP 18729421A EP 3678824 A1 EP3678824 A1 EP 3678824A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
pressure fluid
fluid jet
pulse frequency
frequency
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.)
Withdrawn
Application number
EP18729421.0A
Other languages
German (de)
English (en)
Inventor
Athanasios Vikas
Bernd Stuke
Malte Bickelhaupt
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3678824A1 publication Critical patent/EP3678824A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/005—Vibratory devices, e.g. for generating abrasive blasts by ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
    • B24C1/045—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass for cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/004—Severing by means other than cutting; Apparatus therefor by means of a fluid jet

Definitions

  • the invention relates to a method and a device for high-pressure fluid processing of a workpiece, as used, for example, to cut or otherwise machine a workpiece by means of a high-pressure fluid jet.
  • Injector unit ejected, so that a high-pressure water jet is formed. Due to the high pressure of the water and the correspondingly high velocity of the water particles in the high-pressure water jet - possibly with the addition of abrasive particles - even the hardest materials can be cut without causing a significant temperature entry into the workpiece. This also materials that are brittle or sensitive to heat, easily and almost in any way divide.
  • the same method can also be used to machine the workpiece by means of the high pressure blast jet on its surface, for example, to remove a lacquer coating or other coating, or to otherwise remove the workpiece
  • the high pressure fluid jet is directed at the workpiece.
  • the workpiece is fixed in a holding device and the cut is carried out by either the Workpiece or the injector is moved relative to the workpiece. If the workpiece is to be moved, it is located on a travel table, which allows movement of the workpiece in a plane perpendicular to the direction of the high-pressure fluid jet. Computer-controlled, this allows a precise cut through the workpiece, and even complicated shapes can be generated in this way.
  • High pressure fluid jet cutting requires relatively high energy because the fluid must be compressed to a very high pressure to achieve adequate cutting performance. Thus, a reduction of the fluid to be compressed is always desirable in order to minimize the energy consumption of the device.
  • the inventive method for high-pressure fluid processing of a workpiece has the advantage that the effectiveness of the pulsed water jet cutting is further increased, thus reducing the need for high-pressure fluid and thus the
  • an injector unit for generating a pulsed high-pressure fluid jet, preferably a pulsed high-pressure water jet, with a prescribable pulse frequency.
  • a holding device for fixing a workpiece to be machined is present.
  • a control device for controlling the frequency of the high pressure fluid jet is provided.
  • the movement and vibration of the workpiece is detected at least in the direction of the high pressure fluid jet by means of a motion sensor.
  • the pulse rate is changed so that the vibration excitation of the workpiece by the pulsed high-pressure fluid jet reaches a maximum, and then the workpiece is processed with the high pressure fluid jet and thus found pulse rate.
  • the workpiece By subjecting the workpiece to a high-pressure pulsed fluid jet, the workpiece is vibrated at a frequency equal to the pulse frequency of the high-pressure fluid jet, which physically corresponds to a forced vibration.
  • the amplitude of the oscillation depends on whether this frequency coincides with one of the natural frequencies of the workpiece resulting from the geometry, the material properties and the clamping conditions of the workpiece in the device. If the workpiece oscillates at a natural frequency excited by the high-pressure fluid jet, the deflection of the workpiece is maximum, and these workpiece vibrations interfere with the pulse of the high-pressure fluid jet, thus enhancing the cutting action.
  • a better cutting effect can be achieved with the same amount of fluid or with less high-pressure fluid, the same cutting action, so that ultimately less high-pressure fluid is needed and the energy consumption of the high-pressure cutting device is reduced.
  • the vibration excitation of the workpiece is continuously detected by the high pressure fluid jet.
  • the pulse frequency can optionally be changed and adjusted during processing so that the machining always takes place at a pulse frequency at which the oscillation excitation of the workpiece is maximum, that is excited in one of its natural frequencies.
  • no natural frequency is excited by means of the pulsed high-pressure fluid jet, but the workpiece is caused to oscillate with the pulse frequency of the high-pressure fluid jet by means of a displacement device, which can move the workpiece in the direction of the high-pressure fluid jet.
  • the workpiece vibrates at the same frequency or a multiple of the pulse frequency of the high pressure fluid jet.
  • the high-pressure fluid jet impinging periodically on the material is in a fixed phase relationship with the vibration of the workpiece, so that the high-pressure fluid jet always strikes the workpiece when it passes through the workpiece
  • Vibration excitation moves in the direction of the high pressure fluid jet.
  • the cutting effect is increased, and it can be the cutting speed can be increased or a corresponding time or energy savings can be achieved.
  • the device according to the invention for high-pressure fluid processing of a workpiece has an injector unit for generating a pulsed high-pressure fluid jet, a holding device for fixing the workpiece and a control device for controlling the pulse frequency of the high-pressure fluid jet generated by the injector unit. Furthermore, a motion sensor is provided which detects the movement or oscillation of the workpiece at least in the direction of the high-pressure fluid jet. By means of the device according to the invention, the movement or oscillation of the workpiece in the direction of the high-pressure fluid jet can be detected and thus the amplitude with which the workpiece is excited by the high-pressure fluid jet can be measured.
  • a displacement device is provided on the holding device, with which the workpiece is movable in the direction of the high-pressure fluid jet.
  • the shuttle may also be used to move the workpiece perpendicular to the direction of the high pressure fluid jet.
  • the traversing device is particularly suitable for to periodically move the workpiece at a frequency in the direction of the high pressure fluid jet that corresponds to the pulse frequency of the high pressure fluid jet.
  • the motion sensor for detecting the movement of the workpiece is an ultrasonic sensor.
  • the motion sensor can advantageously be an optical sensor or an acceleration sensor which is applied directly to the workpiece.
  • Figure 2 is a plan view of the holding device for the workpiece
  • Figure 3 is a perspective view of the holding device of another
  • FIGS 4a, 4b and 4c different embodiments of the motion sensor
  • Figure 5 is an illustration of the vibrating workpiece clamped in the fixture.
  • the device comprises an injector unit 1, which is designed to generate a high-pressure fluid jet 2, which exits through an opening in the injector unit 1.
  • the fluid usually water
  • the injector unit 1 is designed to generate a pulsed high-pressure fluid jet 2, ie to periodically interrupt the high-pressure fluid jet, so that the high-pressure fluid jet strikes the workpiece 4 at a specific pulse frequency.
  • the injector 1 is a to provided electrically controlled interrupter unit, which is connected via a control line 13 to a control device 12 and controlled by this.
  • the pulse frequency can be adjusted within a wide range, preferably with a pulse frequency of 1 Hz to 100 Hz.
  • the workpiece 4 is fixed in a holding device 5, wherein the holding device 5 is formed in this embodiment substantially as a frame in which the here rectangular workpiece 4 is fixed by means of a plurality of clamping devices 6.
  • the holding device 5 is in turn movable by displacement units 16, 17, wherein a - here only schematically indicated - displacement unit 16, the holding device 5 moves in the x direction, while a second displacement unit 17, the holding device 5 in the y direction, d. H. into the drawing plane, can move.
  • the holding device 5 may be formed in another way to accommodate the workpiece can.
  • a movement sensor 15 For detecting the movement or the vibration of the workpiece 4 is a movement sensor 15 which is disposed below the workpiece 4 and which is formed for example as an ultrasonic sensor.
  • the motion sensor 15 is connected via a sensor line 14 to the control device 12, so that the
  • Control device 12 receives corresponding signals from the motion sensor 15 and thus can detect the movement of the workpiece 4.
  • FIG. 2 a lower view of the holding device 5 is shown once again, and the positioning of the motion sensor 15.
  • the motion sensor 15 is arranged at a distance from the workpiece 4 and detects its movement in the direction of the high-pressure fluid jet 2.
  • a pulsed water jet is generated on the injector unit 1 via the control device 12 and impinges on the workpiece 4 at a predetermined frequency.
  • This frequency can be adjusted in wide ranges and is preferably located in the range between 5 and 30 Hz.
  • the pulsed high-pressure fluid jet 2 impinges on the workpiece 4 and thereby causes it to vibrate, which physically corresponds to a forced oscillation.
  • the amplitude of this vibration tion is essentially determined by the pulse frequency of the high-pressure fluid jet 2, the speed and quantity of the impinging fluid, the mechanical material properties of the workpiece 4 and by its fixation on the holding device 5.
  • the motion sensor 15 detects the movement of the workpiece 4 in the direction of the high-pressure fluid jet 2 so that the oscillation amplitude of the
  • the amplitude of the workpiece 4 with which this oscillates likewise changes.
  • the frequency of the high-pressure fluid jet 2 that is to say the pulse frequency
  • an amplitude maximum of the oscillation of the workpiece 4 can thus be set, which will be the case exactly when the pulse frequency of the high-pressure fluid jet 2 corresponds to a natural frequency of the workpiece 4. If the workpiece 4 blended at this frequency, the cutting action of the pulsed high-pressure fluid jet is maximum.
  • the cutting speed can be increased or less high-pressure fluid can be used and thus less energy can be consumed.
  • the natural frequencies of the workpiece 4 change during the dicing, since the now separated parts of the workpiece 4 have different vibration modes. This can be detected by the motion sensor 15 and the pulse frequency can be adjusted accordingly during processing.
  • FIG. 3 shows a further holding device 5 according to the invention.
  • This is also designed as a frame on which the workpiece 4, which is not shown here for clarity, can be fixed.
  • the holding device 5 can be moved by means of a first displacement unit 16 in the x-direction and by means of a second displacement unit 17 in the y-direction, wherein the two displacement devices 16, 17 are here exemplified as rotating cylinders on which the holding device 5 rolls.
  • a traversing device 1 At each corner of the holding device 5 is a traversing device 1, which makes it possible to Holding device 5 in the z-direction, ie to move in the direction of the high-pressure fluid jet 2.
  • the traversing device 18 can be designed, for example, as four piezo actuators, which makes it possible to move the holding device 5 with almost any frequency in the z direction.
  • the traversing device 18, ie the four piezo actuators, are connected to the control device 12 and can be excited by the latter, wherein the connection takes place via control lines 19.
  • the method can be modified to the effect that the high-pressure fluid jet 2 still strikes the workpiece 4 with a predetermined pulse frequency, but the holding device 5 now by the traversing device 18 during processing of the workpiece 4 with the same frequency z-direction is moved.
  • the same amplification effect of the cutting action occurs as in the excitation of the workpiece 4 with a natural frequency. Since the excitation frequency of the workpiece 4 is not predetermined here by its natural frequency, but can be targeted by the traversing device 18, almost any frequencies can be used and it is also possible that the traversing device 18, the workpiece 4, for example, with twice or three times the pulse frequency the high-pressure fluid jet 2 is excited.
  • FIG. 4 a shows an exemplary embodiment of a motion sensor 15 which operates with ultrasound 20.
  • the ultrasound 20 emitted by the motion sensor 15 strikes the workpiece 4, is reflected and picked up again by the motion sensor 15. On the duration of the signal or on the phase relationship between the emitted and reflected ultrasonic wave can be concluded that the movement of the workpiece 4.
  • FIG. 4b shows an exemplary embodiment in which the distance between motion sensor 15 and workpiece 4 and thus its movement measured by a laser beam.
  • the movement sensor 15 has a laser 115 which generates a laser beam 22 which is reflected by the workpiece 4 and registered in a photoreceiver 215. If the angle of the laser beam 22 changes when it strikes the photoreceiver 215, the position of the workpiece 4 can be calculated therefrom.
  • the motion sensor 15 is designed as an acceleration sensor and applied directly to the workpiece 4, for example glued.
  • the motion sensor 15 is subjected to the same motion or vibration as the workpiece 4 in this area and measures the corresponding acceleration values from which the speed and the position of the workpiece 4 can be determined. It is also possible to apply a plurality of acceleration sensors to the workpiece 4 in order to measure the movements at different points.
  • FIG. 5 shows in an illustration the movement of the workpiece 4 within the holding device 5, as happens when the workpiece 4 is excited in its natural frequency.
  • the workpiece 4 is here clamped on the holding device 5 at its edges and can oscillate between the frame of the holding device 5. If the workpiece 4 is excited by the high-pressure fluid jet in its natural frequency, here in the first natural vibration, then the workpiece 4 oscillates maximally in its center and performs a movement as illustrated in FIG. 5, the amplitude of the oscillation in FIG 5 is exaggerated and usually will be much smaller.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

L'invention concerne un procédé pour l'usinage d'une pièce (4) au moyen d'un fluide haute pression. Le dispositif comprend une unité injecteur (1) destinée à produire un jet de fluide haute pression pulsé (2), de préférence un jet d'eau haute pression pulsé (2), à une fréquence d'impulsion pouvant être prédéfinie, un dispositif de retenue pour la fixation d'une pièce (4) à usiner, un capteur de mouvement (15) destiné à détecter le mouvement de la pièce (4) au moins en direction du jet de fluide haute pression, et un dispositif de commande destiné à commander la fréquence du jet de fluide haute pression. La pièce est soumise à l'effet d'un jet de fluide haute pression à une fréquence d'impulsion prédéfinie, déplacée en direction du jet de fluide haute pression au moyen du dispositif de déplacement à la même fréquence que la fréquence d'impulsion du jet de fluide haute pression, et usinée au moyen du jet de fluide haute pression de cette fréquence d'impulsion. Le dispositif permettant la mise en œuvre de ce procédé comporte un capteur de mouvement destiné à détecter le mouvement de la pièce au moins en direction du jet de fluide haute pression.
EP18729421.0A 2017-07-19 2018-06-06 Procédé et dispositif d'usinage au moyen d'un fluide haute pression Withdrawn EP3678824A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017212324.9A DE102017212324A1 (de) 2017-07-19 2017-07-19 Verfahren und Vorrichtung zur Hochdruckfluidbearbeitung
PCT/EP2018/064861 WO2019015846A1 (fr) 2017-07-19 2018-06-06 Procédé et dispositif d'usinage au moyen d'un fluide haute pression

Publications (1)

Publication Number Publication Date
EP3678824A1 true EP3678824A1 (fr) 2020-07-15

Family

ID=62530247

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18729421.0A Withdrawn EP3678824A1 (fr) 2017-07-19 2018-06-06 Procédé et dispositif d'usinage au moyen d'un fluide haute pression

Country Status (3)

Country Link
EP (1) EP3678824A1 (fr)
DE (1) DE102017212324A1 (fr)
WO (1) WO2019015846A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111791148B (zh) * 2020-06-28 2021-04-20 泉州台商投资区飞翔机械设计服务中心 一种用于夹丝玻璃的高效水切装置及方法
US11533688B2 (en) 2021-03-17 2022-12-20 T-Mobile Usa, Inc. Dynamic switching of user equipment power class
CN113814560B (zh) * 2021-09-10 2022-11-11 广东工业大学 多脉宽激光加工装置及方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10036146C1 (de) * 2000-07-25 2002-01-17 Fraunhofer Ges Forschung Verfahren zum Schneiden von Werkstücken mit einem Schneidstrahl
DE10041370A1 (de) * 2000-08-23 2002-03-07 Mannesmann Sachs Ag Reinigungsvorrichtung und Verfahren zum Reinigen von Werkstücken
JP4473599B2 (ja) * 2004-02-23 2010-06-02 株式会社ディスコ ウォータージェット加工装置
US9549753B2 (en) * 2011-04-01 2017-01-24 Christopher Burnside Gordon Fluid jet cell harvester and cellular delivery system
EP2740574A1 (fr) * 2012-12-04 2014-06-11 Siemens Aktiengesellschaft Dispositif et procédé de jet d'eau à surveillance acoustique
CH707367A8 (de) * 2012-12-18 2014-12-15 Micromachining Ag Verfahren zum Bearbeiten einer Folge von Werkstücken mittels mindestens eines Bearbeitungsstrahls.
DE102014225247A1 (de) 2014-12-09 2016-06-09 Robert Bosch Gmbh Verfahren zum Flüssigkeitsstrahlschneiden
DE102014225904A1 (de) * 2014-12-15 2016-06-16 Robert Bosch Gmbh Verfahren zum Flüssigkeitsstrahlschneiden

Also Published As

Publication number Publication date
DE102017212324A1 (de) 2019-01-24
WO2019015846A1 (fr) 2019-01-24

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