EP3233397B1 - Verfahren zum flüssigkeitsstrahlschneiden - Google Patents

Verfahren zum flüssigkeitsstrahlschneiden Download PDF

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Publication number
EP3233397B1
EP3233397B1 EP15787556.8A EP15787556A EP3233397B1 EP 3233397 B1 EP3233397 B1 EP 3233397B1 EP 15787556 A EP15787556 A EP 15787556A EP 3233397 B1 EP3233397 B1 EP 3233397B1
Authority
EP
European Patent Office
Prior art keywords
liquid
workpiece
nozzle
liquid jet
machining
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.)
Not-in-force
Application number
EP15787556.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3233397A1 (de
Inventor
Jens-Peter Nagel
Malte Bickelhaupt
Uwe Iben
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 EP3233397A1 publication Critical patent/EP3233397A1/de
Application granted granted Critical
Publication of EP3233397B1 publication Critical patent/EP3233397B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a method for liquid jet cutting, as it is preferably applied to the cutting of solid materials.
  • a device for liquid jet cutting which does not use a continuous stream of water to cut the material, but a pulsed water jet, in which the liquid jet is interrupted at regular intervals.
  • the pulsed liquid jet has the particular advantage that the cutting device manages with a relatively low pressure and above all is significantly more energy efficient than the known continuous jet cutting method.
  • the operating parameters are crucial.
  • the method according to the invention for liquid jet cutting has the advantage that an efficient and energy-saving cutting process is ensured, which additionally leads to an improved cutting edge, so that particularly smooth cut edges can be achieved.
  • the method for liquid jet cutting comprises a compressor unit which compresses a liquid for generating a liquid jet and a nozzle which is connected to the compressor unit.
  • the nozzle has an outlet opening through which the compressed liquid emerges in the form of a jet of liquid, and with an interrupter unit which can interrupt or release a flow of the compressed liquid to the outlet opening.
  • the following process steps are performed:
  • the liquid is compressed by the compressor unit, the outlet opening is brought to the workpiece to be machined up to a machining distance, the liquid jet is alternately released and interrupted by the interrupter unit, while the nozzle moves relative to the workpiece in a machining direction becomes.
  • the machining angle between the workpiece surface and the liquid jet is 60 ° to 80 °.
  • the effect of machining can be improved, especially for relatively hard workpieces. If the liquid jet impinges on the workpiece surface at a smaller machining angle, then an edge forms at the cutting end with a pointed machining angle in the workpiece against which the liquid jet can attack and thus better break up the material, in particular hard materials. It is advantageous to use a smaller machining angle, the harder the material to be machined.
  • the pulse duration is 100 to 1000 ⁇ s, wherein the liquid jet is opened and closed by the interrupter unit periodically for generating liquid pulses in an advantageous manner. If the liquid pulses are generated periodically, the workpiece can be moved in the machining direction at a uniform speed, so that a cutting line is formed in the workpiece.
  • liquid pulses per second are generated, ie the liquid pulses are sprayed onto the workpiece at a frequency of 25 to 500 Hz.
  • the frequency of the liquid pulses depends on the processing speed, ie the speed with which the nozzle moves relative to the workpiece and on the thickness and the material properties of the workpiece.
  • the distance of the nozzle opening to the workpiece surface during processing 0.5 to 2 mm, preferably 1 to 2 mm. This distance ensures efficient machining of the workpiece without the back splash of water leading to damage to the nozzle.
  • the nozzle is moved relative to the workpiece at a speed of 10 to 1200 mm / min, wherein the feed rate depends on the thickness of the workpiece and the material properties of the workpiece.
  • the nozzle has a nozzle body with a longitudinal bore, wherein the longitudinal bore forms a pressure chamber into which the compressed liquid is supplied.
  • the interrupter unit is formed by a longitudinally movable within the pressure chamber nozzle needle, which opens and closes the outlet opening by their longitudinal movement.
  • FIG. 1 a device for carrying out the liquid jet cutting process according to the invention is shown.
  • a tank 1 the liquid is kept, which is used for liquid jet cutting use, for example, purified water, but other liquids are possible.
  • the liquid is supplied from the liquid tank 1 via a line 2 to a compressor unit 3, for example a high-pressure pump, where the liquid is compressed and fed via a high-pressure line 4 into a high-pressure collecting space 5, where the compressed liquid is kept.
  • the high-pressure accumulator 5 is used to compensate for pressure fluctuations, so as to perform the liquid jet cutting at a constant high pressure, without the compressor unit 3 must be readjusted at short intervals.
  • a pressure line 7 leads to a nozzle 10, the nozzle 10 having an interrupter unit 8, here in the form of a 2/2-way valve, and an outlet opening 11 in the form of a restricted passage for the liquid, so that from the outlet opening 11 a Fluid jet 14 emerges, which is focused sharply and strikes a workpiece 15 during operation.
  • an interrupter unit 8 here in the form of a 2/2-way valve
  • an outlet opening 11 in the form of a restricted passage for the liquid
  • the inventive method is carried out as follows: In the nozzle 10 is located on the pressure line 7 high-density liquid, the interrupter unit 8 is closed at the beginning. In order to generate a pulsed liquid jet 14, the interrupter unit 8 is now closed and opened at regular intervals so that a pulsed liquid jet 14 which hits the surface of the workpiece 15 emerges through the outlet opening 11. Upon impact of the liquid on the workpiece 15, the affected areas are shattered and washed away the fragments on the effluent liquid. Thereby, the workpiece is cut, wherein the cutting line is generated by a movement of the workpiece 15 in a machining direction, wherein it can also be provided that not the workpiece 15, but the nozzle 10 is moved by a suitable device relative to the workpiece 15.
  • FIG. 2 shows a schematic representation of a nozzle 10 according to the invention with the associated workpiece 15.
  • the nozzle 10 shown here has a nozzle body 12, in which a bore 13 is formed, in which a nozzle needle 18 is arranged longitudinally displaceable. Between the wall of the bore 13 and the nozzle needle 18, a pressure chamber 17 is formed, in which the highly compressed liquid is supplied via the pressure line 7.
  • the nozzle needle 18 cooperates with a nozzle seat 20, so that upon contact of the nozzle needle 18 on the nozzle seat 20, the pressure chamber 17 is separated from the injection port 11, which is formed as a bore in the nozzle body 10. If the nozzle needle 18 lifts off from the nozzle seat 20, liquid flows out of the pressure chamber 17 through the outlet opening 11 and forms a liquid jet 14 which strikes the workpiece 15.
  • the nozzle needle 18 is periodically moved up and down, thus releasing the liquid jet 14 or interrupts the liquid supply between two injections.
  • the workpiece 15 is moved in the machining direction 22, it is irrelevant whether the workpiece or the nozzle is moved or both simultaneously.
  • the nozzle body 10 and thus the liquid jet 14 are inclined at an operating angle ⁇ to the workpiece surface 115 of the workpiece 15, wherein the processing angle ⁇ is less than 90 °.
  • the machining angle ⁇ is defined between the liquid jet 14 and the workpiece surface 115 in the machining direction 22. If the liquid jet hits the workpiece surface 115, the liquid jet 14 shatters the material of the workpiece 15 in this area. Due to the inclination of the liquid jet 14 results in an edge 19 at the end of the cut, which includes an obtuse angle between the workpiece surface 115 and the section through the liquid jet 14, which complemented in the ideal case with the processing angle ⁇ to 180 °, as in Fig. 3 enlarged in a longitudinal section through the workpiece 15 is shown.
  • the liquid jet 14 can be smashed more easily by the acute angle at the edge 19, in particular in the case of very hard materials, by the liquid jet 14 and thus be cut more easily and in higher quality.
  • the machining can also be carried out with a larger machining angle, so that the optimum machining angle can be optimized depending on the hardness of the workpiece.
  • FIG. 4 the time course of the liquid jet is shown schematically, wherein on the ordinate the leaked amount of liquid per unit time Q is removed and on the abscissa the time t.
  • a liquid jet 14 is periodically ejected from the nozzle 10, the individual pulses having a time t p and a time interval from one another t a .
  • the pulses can, as shown here, follow each other periodically and all be of the same design, or different pulses can also be generated which follow one another regularly or at variable time intervals.
  • the duration of the liquid pulses t p is less than 1000 ⁇ s, preferably 100 to 1000 ⁇ s, in order to achieve an optimum cutting edge depending on the material.
  • Pulsed liquid jet cutting is particularly well suited for cutting glass fiber or carbon fiber plates (CFRP) or metal sheets, for example aluminum.
  • CFRP carbon fiber plates
  • pulsed liquid jet cutting offers an advantage over the continuous jet liquid jet cutting with much smoother cutting edge, ie the fraying of the carbon fibers at the edge of the cutting edge is largely prevented.
  • the energy input when cutting a CFRP board can be reduced by up to a factor of 20.
  • the pulsed water jet cutting comes with a lower pressure.
  • the liquid is held within the nozzle 12 with a pressure of, for example, 2500 bar, which compared to the otherwise known continuous wave liquid jet cutting process, which usually operate at up to 6000 bar, is significantly reduced with correspondingly lower energy consumption.
  • the machining distance of the nozzle 10 to the workpiece 15, in FIG. 1 and FIG. 2 Denoted by d is preferably 0.5 to 2 mm, preferably 1 to 2 mm. With this machining distance d , one achieves an optimum effect, without must be reckoned by injecting liquid with damage to the nozzle.
  • the pulsed liquid jet cutting is particularly suitable for CFRP materials for plates with a thickness a up to 2 mm, wherein the diameter of the liquid jet is about 150 microns.
  • the pressures used are about 2500 bar, although it is also possible to work with lower liquid pressure.
  • Optimal machining angles ⁇ are 60 ° to 80 °, clock rates at a pulse frequency of more than 40 Hz and a pulse duration of 1000 ⁇ s or less, wherein the clock rate must be adjusted to the feed rate of processing, d. H. the faster the feed rate, the higher the clock rate must be.
  • the liquid jet is interrupted periodically by means of the interrupter unit to achieve the liquid pulses.
  • interrupting does not necessarily refer to completely closing the orifice at the nozzle. It can also be provided that the interrupter unit throttles the liquid jet only very strongly, but still some liquid exits at low pressure between the liquid pulses. The described effects are also achieved, provided that the throttling is sufficiently strong. In this case, throttling to 80 to 90% of the liquid quantity per unit of time Q is sufficient, which exits unthrottled from the nozzle 10.

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  • 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)
EP15787556.8A 2014-12-15 2015-10-27 Verfahren zum flüssigkeitsstrahlschneiden Not-in-force EP3233397B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014225904.5A DE102014225904A1 (de) 2014-12-15 2014-12-15 Verfahren zum Flüssigkeitsstrahlschneiden
PCT/EP2015/074889 WO2016096215A1 (de) 2014-12-15 2015-10-27 Verfahren zum flüssigkeitsstrahlschneiden

Publications (2)

Publication Number Publication Date
EP3233397A1 EP3233397A1 (de) 2017-10-25
EP3233397B1 true EP3233397B1 (de) 2018-08-29

Family

ID=54364325

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15787556.8A Not-in-force EP3233397B1 (de) 2014-12-15 2015-10-27 Verfahren zum flüssigkeitsstrahlschneiden

Country Status (5)

Country Link
US (1) US20170326751A1 (zh)
EP (1) EP3233397B1 (zh)
CN (1) CN107000239A (zh)
DE (1) DE102014225904A1 (zh)
WO (1) WO2016096215A1 (zh)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3020520B1 (en) * 2014-11-14 2018-01-03 HP Scitex Ltd Liquid nitrogen jet stream processing of paper, cardboards or carton
DE102016124422A1 (de) * 2016-12-14 2018-06-14 Hammelmann GmbH Hochdruckplungerpumpe sowie Verfahren zur Funktionsunterbrechung eines Fluidstroms
DE102016225373A1 (de) * 2016-12-19 2018-06-21 Robert Bosch Gmbh Vorrichtung zur Erzeugung eines Fluidstrahls
DE102017206166A1 (de) 2017-04-11 2018-10-11 Robert Bosch Gmbh Fluidstrahlschneidvorrichtung
DE102017212324A1 (de) * 2017-07-19 2019-01-24 Robert Bosch Gmbh Verfahren und Vorrichtung zur Hochdruckfluidbearbeitung
DE102018202841A1 (de) * 2018-02-26 2019-08-29 Robert Bosch Gmbh Vordruck zum Hochdruckfluidstrahlschneiden
DE102018222135A1 (de) * 2018-12-18 2020-06-18 Robert Bosch Gmbh Düse zur Erzeugung eines Hochdruckwasserstrahls
DE102019004686A1 (de) * 2019-06-28 2020-12-31 Technische Universität Chemnitz Verfahren zur Bearbeitung einer Schneidkante eines Zerspanungs- oder Schneidwerkzeuges und Vorichtung zur Durchführung des Verfahrens

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JPH0777720B2 (ja) * 1988-11-22 1995-08-23 工業技術院長 ウォータージェット用ノズル
CA2035702C (en) * 1991-02-05 1996-10-01 Mohan Vijay Ultrasonically generated cavitating or interrupted jet
US5134347A (en) * 1991-02-22 1992-07-28 Comfortex Corporation Low power consumption wireless data transmission and control system
US7299732B1 (en) * 1994-10-24 2007-11-27 United Technologies Corporation Honeycomb removal
US5927329A (en) * 1997-05-30 1999-07-27 Jetec Company Apparatus for generating a high-speed pulsed fluid jet
CN101439521A (zh) * 2008-12-22 2009-05-27 陈涛 一种用于水刀切割机上的喷头结构
KR20120099387A (ko) * 2009-09-29 2012-09-10 피코드릴 에스 아 기판 절단 방법 및 절단 장치
US8423172B2 (en) * 2010-05-21 2013-04-16 Flow International Corporation Automated determination of jet orientation parameters in three-dimensional fluid jet cutting
US8505583B2 (en) * 2010-07-12 2013-08-13 Gene G. Yie Method and apparatus for generating high-speed pulsed fluid jets
DE102012224397A1 (de) * 2012-12-27 2014-07-03 Robert Bosch Gmbh Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102013201797A1 (de) 2013-02-05 2014-08-07 Robert Bosch Gmbh Vorrichtung mit einer Hochdruckpumpe zum Fördern eines Fluids
CN203221551U (zh) * 2013-04-16 2013-10-02 黄山金仕特种包装材料有限公司 一种用于湿纸幅的分切装置
US9658613B2 (en) * 2014-01-22 2017-05-23 Omax Corporation Generating optimized tool paths and machine commands for beam cutting tools

Also Published As

Publication number Publication date
WO2016096215A1 (de) 2016-06-23
US20170326751A1 (en) 2017-11-16
EP3233397A1 (de) 2017-10-25
CN107000239A (zh) 2017-08-01
DE102014225904A1 (de) 2016-06-16

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