EP3233292A1 - Procédé pour éliminer par jet de liquide le revêtement de surfaces - Google Patents

Procédé pour éliminer par jet de liquide le revêtement de surfaces

Info

Publication number
EP3233292A1
EP3233292A1 EP15788368.7A EP15788368A EP3233292A1 EP 3233292 A1 EP3233292 A1 EP 3233292A1 EP 15788368 A EP15788368 A EP 15788368A EP 3233292 A1 EP3233292 A1 EP 3233292A1
Authority
EP
European Patent Office
Prior art keywords
liquid
workpiece
nozzle
liquid jet
jet
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.)
Granted
Application number
EP15788368.7A
Other languages
German (de)
English (en)
Other versions
EP3233292B1 (fr
Inventor
Uwe Iben
Jens-Peter Nagel
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 EP3233292A1 publication Critical patent/EP3233292A1/fr
Application granted granted Critical
Publication of EP3233292B1 publication Critical patent/EP3233292B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/08—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape of pulsating nature, e.g. delivering liquid in successive separate quantities ; Fluidic oscillators
    • B05B1/083—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape of pulsating nature, e.g. delivering liquid in successive separate quantities ; Fluidic oscillators the pulsating mechanism comprising movable parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/022—Cleaning travelling work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/024—Cleaning by means of spray elements moving over the surface to be cleaned

Definitions

  • the present invention relates to a method for liquid jet stripping of surfaces, preferably for removing adherent layers.
  • the method according to the invention for stripping a surface has the advantage that the energy consumption is significantly reduced and better quality is achieved during stripping.
  • 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 exit opening through which the compressed liquid emerges in the form of a jet of liquid, and an interrupter unit which can interrupt or release a flow of the compressed liquid to the exit 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 stripped up to a processing 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 pulsed liquid jet stripping can be performed more precisely, so that in particular coatings of very hard and firmly adhering materials, such as metal layers, ceramic layers or DLC layers (diamond like carbon) can be easily removed from an example metallic workpiece.
  • the pulsed emerging liquid jet shatters the coating while the underlying workpiece is not damaged at a suitable machining distance and pulse duration.
  • the effect comes to fruition that, unlike the stripping with a continuous jet, the liquid between two pulses has enough time to flow away laterally, so that the new pulse can effectively attach to the layer and detach it from the surface. Since the liquid jet is not in yet on the Cavity, which can lead to unwanted damage to the actual workpiece surface, does not result in any cavitation on the surface of the workpiece.
  • the machining angle between the workpiece surface and the liquid jet may be 90 °, however, the machining angle in an advantageous embodiment of the invention is less than 90 °, preferably between 60 ° and 80 °. This angle range has proved to be particularly advantageous for very hard materials. It is advantageous to use an even smaller machining angle, the harder the material of the coating is and the better the coating adheres to the component surface.
  • the machining angle and the machining distance, ie the distance of the outlet opening from the component surface, must be optimized on the hardness of the component, the hardness of the coating and the adhesion of the coating on the component surface in order to safely release the coating from the workpiece and on the other hand, not to damage the workpiece surface.
  • the pulse duration is 100 to 1000 is, 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 at a uniform speed in a machining direction and thus the coating can be removed in a planar, linear or punctiform manner.
  • 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 coating.
  • the distance of the nozzle opening to the workpiece surface during machining 0.5 to 3.0 mm, preferably 1.0 to 2.0 mm. This distance makes an efficient stripping of the Ensured workpiece without the back-splashed water could cause 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 coating, its material property and the pulse frequency of the liquid jet.
  • the nozzle has a nozzle body with a longitudinal bore, wherein the longitudinal bore forms a pressure chamber into which the compressed liquid is introduced.
  • 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.
  • Figure 1 is a schematic representation of an apparatus for performing the liquid jet stripping process according to the invention, in
  • Figure 2 is a likewise schematic representation of the nozzle for stripping
  • FIG. 3 shows an enlarged, schematic cross section through the workpiece in the area in which the liquid jet strikes the workpiece
  • Figure 4 is a schematic representation of the time course of the discharged liquid amount of the nozzle.
  • FIG. 1 shows an apparatus for carrying out the stripping method according to the invention.
  • a liquid container 1 the liquid is stored, which is used for stripping, for example, purified water, but other liquids are possible.
  • the liquid is supplied from the liquid container 1 via a line 2 to a compressor unit 3, for example a high pressure pump, in which the liquid is compressed and fed via a high-pressure line 4 into a Hochdrucksammeiraum 5, where the compressed liquid is kept.
  • the Hochdrucksam- melraum 5 serves to compensate for pressure fluctuations, so as to
  • the workpiece 15 is provided with a coating 22 which adheres firmly to the workpiece 15, for example a lacquer coating or a colored layer, which is applied to the surface of a preferably metallic workpiece.
  • the interrupter unit 8 is now closed and opened at regular intervals, so that through the outlet opening 11 a pulsed liquid jet 14 emerges, which strikes the surface of the workpiece 15.
  • the coating 22 is shattered and the fragments of the coating 22 are coated with the flushed away flowing liquid.
  • the coating 22 is removed in the regions of the workpiece surface which are acted upon by the liquid jet 14, whereby the regions in which the coating 22 is to be removed can be processed in a targeted manner by a movement of the workpiece 15 in a machining direction.
  • the coating 22 can be removed over a large area, or even linear or punctiform, depending on the desired application.
  • FIG. 2 shows a schematic representation of a nozzle 10, which can be used in the method according to the invention, with the workpiece to be stripped 15.
  • the nozzle 10 shown here has a nozzle body 12, in which a bore 13 with a longitudinally displaceable nozzle needle arranged therein 18 is formed. 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 introduced 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 moved up and down periodically and thus releases the liquid jet 14 or interrupts the liquid supply.
  • the workpiece 15 is moved in a machining direction, it is irrelevant whether the workpiece or the nozzle is moved or both simultaneously.
  • the nozzle body 10 and thus the liquid jet 14 may be aligned perpendicular to the surface 115 of the workpiece, but it may also be that the liquid jet 14 at an angle ⁇ on the workpiece surface, wherein the machining angle ⁇ is then less than 90 °.
  • the machining angle ⁇ is defined as the smallest angle between the liquid jet 14 and the workpiece surface 115.
  • the liquid jet 14 strikes the workpiece surface 115, the liquid jet 14 shatters the coating 22 on the surface 115 of the workpiece 15 in this area.
  • the liquid jet 14 can attach by the acute angle directly to the coating 22, which smashes the coating more effectively and more easily, especially in very hard coating materials, such as ceramic, hard metal layers or DLC layers (diamond like carbon) and thus faster and more thorough processing makes possible.
  • the machining can also be performed with a larger machining angle, so that the optimum machining angle can be optimized depending on the hardness of the coating, the hardness of the workpiece and the adhesion of the coating on the workpiece surface.
  • FIG. 4 the time course of the liquid jet is shown schematically, wherein the escaped liquid quantity per time unit Q is plotted on the ordinate and the time t on the abscissa.
  • Interrupter unit 8 is periodically ejected from the nozzle 10, a liquid jet 14, wherein the individual pulses have a time f p and a temporal distance from each other from t a .
  • the pulses may, as shown here, follow each other periodically and all be of the same design, or different pulses can be generated which are regular or variable in time
  • the duration of the liquid pulses f p is less than 1000 is, preferably 100 to 1000 is to achieve optimal processing depending on the material.
  • the pulsed liquid jet cutting is particularly well suited for Decoating of metallic workpieces and of hard and strongly adhering coatings, for example ceramic layers, layers of hard metal (chromium, titanium, vanadium) and for diamond-like layers, such as DLC (diamond like carbon) layers.
  • Fluid jet stripping significantly improved processing results and shorter processing times.
  • the energy input during stripping can be reduced by up to a factor of 20, since on the one hand less liquid must be compressed and on the other hand requires a processing with lower pressures:
  • the liquid is held within the nozzle 12 with a pressure of for example 2500 bar, which compared to the otherwise known continuous liquid jet blasting where it is operated at a pressure of up to 6000 bar, is significantly reduced.
  • the machining distance of the nozzle 10 to the workpiece 15, denoted d in FIG. 1 and FIG. 2 is preferably 0.5 to 3.0 mm, preferably 1.0 to 2.0 mm. With this machining distance d, an optimum effect is achieved without having to reckon with nozzle damage due to back-splashed liquid.
  • the pulsed liquid jet has a diameter of about 150 ⁇ at a pressure of about 2500 bar, which can also be used with lower fluid pressure.
  • Optimal processing angles ⁇ are 60 ° to 80 °, clock rates at a pulse frequency of more than 40 Hz and a pulse duration of 1000 is or less, the clock rate on the feed rate of
  • Processing must be coordinated, 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.
  • the interrupter unit throttles the liquid jet only very strongly, but still some liquid exits at low pressure between the liquid pulses.
  • Throttling is sufficiently strong. In this case, throttling to 80 to 90% of the liquid quantity per unit time Q is sufficient, which exits in the open state of the nozzle 10.

Landscapes

  • Cleaning By Liquid Or Steam (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

L'invention concerne un procédé permettant d'éliminer par jet de liquide le revêtement d'une surface d'une pièce (15), impliquant une unité compresseur (3) qui comprime un liquide pour produire un jet de liquide, et une buse (10) qui est reliée à l'unité compresseur (3) et qui présente une ouverture de sortie (11) par laquelle le liquide comprimé sort sous forme de jet de liquide (14). Une unité d'interruption (8) permet d'interrompre ou de libérer l'écoulement du liquide comprimé vers l'ouverture de sortie (11). Ledit procédé comprend les étapes suivantes : comprimer le liquide au moyen de l'unité compresseur (3), approcher l'ouverture de sortie (11) au niveau d'une pièce à usiner (15) jusqu'à une distance d'usinage (d), laquelle est ajustée de manière que le jet de liquide (14) peut détacher le revêtement à éliminer de la surface de la pièce, sans endommager ladite pièce, libérer et interrompre de manière alternée le jet de liquide (14) au moyen de l'unité d'interruption (8), pour qu'il sorte ou pas de l'ouverture de sortie (11), la buse étant simultanément déplacée par rapport à la pièce à usiner dans une direction d'usinage (22).
EP15788368.7A 2014-12-18 2015-10-27 Procédé pour éliminer par jet de liquide le revêtement de surfaces Active EP3233292B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014226432.4A DE102014226432A1 (de) 2014-12-18 2014-12-18 Verfahren zum Flüssigkeitsstrahl-Entschichten von Oberflächen
PCT/EP2015/074893 WO2016096218A1 (fr) 2014-12-18 2015-10-27 Procédé pour éliminer par jet de liquide le revêtement de surfaces

Publications (2)

Publication Number Publication Date
EP3233292A1 true EP3233292A1 (fr) 2017-10-25
EP3233292B1 EP3233292B1 (fr) 2021-09-08

Family

ID=54366200

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15788368.7A Active EP3233292B1 (fr) 2014-12-18 2015-10-27 Procédé pour éliminer par jet de liquide le revêtement de surfaces

Country Status (3)

Country Link
EP (1) EP3233292B1 (fr)
DE (1) DE102014226432A1 (fr)
WO (1) WO2016096218A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016218057A1 (de) * 2016-09-21 2018-03-22 Robert Bosch Gmbh Vorrichtung und Verfahren zum Fluidstrahlschneiden mit abrasiven Partikeln
DE102017205682A1 (de) * 2017-04-04 2018-10-04 Robert Bosch Gmbh Vorrichtung und Verfahren zum Hochdruck-Fluidstrahlschneiden
DE102017219248A1 (de) * 2017-10-26 2019-05-02 Robert Bosch Gmbh Vorrichtung und Verfahren zum Behandeln eines Bauteils
CN107795282B (zh) * 2017-11-21 2023-10-27 中南大学 双控制道脉冲射流球齿钻头

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5835101B2 (ja) * 1977-02-22 1983-07-30 春信 三浦 高圧水の噴射ノズル
US4731125A (en) * 1984-04-19 1988-03-15 Carr Lawrence S Media blast paint removal system
JPS61212353A (ja) * 1985-03-15 1986-09-20 Yasui Sangyo Kk 洗浄用噴射ノズル
DE4105379C2 (de) * 1991-02-21 1995-06-29 Bosch Gmbh Robert Waschvorrichtung für Abdeckscheiben von Kraftfahrzeugleuchten
US7299732B1 (en) * 1994-10-24 2007-11-27 United Technologies Corporation Honeycomb removal
DE19529749C2 (de) 1995-08-12 1997-11-20 Ot Oberflaechentechnik Gmbh Verfahren zum schichtweisen Abtragen von Material von der Oberfläche eines Werkstückes sowie Vorrichtung zur Durchführung dieses Verfahrens
ATE283734T1 (de) * 1998-06-06 2004-12-15 Johannes-Albert Mieden Verfahren und anlage zur entfernung von gefährdenden beschichtungen
DE102008037247A1 (de) * 2008-08-09 2010-02-11 Dürr Ecoclean GmbH Vorrichtung und Verfahren zum Erzeugen eines gepulsten Strahls eines flüssigen Fluids
US8505583B2 (en) * 2010-07-12 2013-08-13 Gene G. Yie Method and apparatus for generating high-speed pulsed fluid jets
US10166556B2 (en) * 2012-08-07 2019-01-01 Vac-Tron Equipment, Llc Pulsating high pressure air and water nozzle

Also Published As

Publication number Publication date
WO2016096218A1 (fr) 2016-06-23
DE102014226432A1 (de) 2016-06-23
EP3233292B1 (fr) 2021-09-08

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