EP3532245B1 - Device for abrasive fluid-jet cutting - Google Patents

Device for abrasive fluid-jet cutting Download PDF

Info

Publication number
EP3532245B1
EP3532245B1 EP17787120.9A EP17787120A EP3532245B1 EP 3532245 B1 EP3532245 B1 EP 3532245B1 EP 17787120 A EP17787120 A EP 17787120A EP 3532245 B1 EP3532245 B1 EP 3532245B1
Authority
EP
European Patent Office
Prior art keywords
control
nozzle
pressure fluid
fluid
pressure
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.)
Active
Application number
EP17787120.9A
Other languages
German (de)
French (fr)
Other versions
EP3532245A1 (en
Inventor
Guenter Feucht
Felix Kulhavy
Uwe Iben
Nicolas Gooss
Peter Kroack
Florian Oberwein
Valentin Paal
Raymond Schuetzenberger
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 EP3532245A1 publication Critical patent/EP3532245A1/en
Application granted granted Critical
Publication of EP3532245B1 publication Critical patent/EP3532245B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
    • 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
    • B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
    • B24C7/0007—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier

Definitions

  • the invention relates to a device for abrasive fluid jet cutting as it is used, for example, to cut or decoat materials by means of a high pressure fluid jet to which abrasive particles are mixed.
  • a device according to the preamble of independent claim 1 in which a fluid, preferably water, is compressed by means of a high pressure pump and fed to a nozzle which can emit a high pressure fluid jet.
  • the nozzle is designed so that it can periodically interrupt the high-pressure fluid jet, so that a pulsating high-pressure fluid jet is created.
  • the actual interruption of the high-pressure fluid jet takes place by means of a movable control piston, which is operated servo-hydraulically, ie is controlled via a changing pressure in a control room.
  • the control piston has two end faces, one end face which delimits the control chamber being larger than the opposite end face of the control piston. If the pressure in the control chamber, which is limited by the larger face of the control piston, is lowered, the control piston moves into the same due to the hydraulic forces and thus releases the connection between a compressor unit and the nozzle, so that a high-pressure fluid jet is emitted the nozzle exits with which the workpiece can be cut or stripped. If the pressure in the control chamber is increased again, the control piston moves back into its closed position and interrupts the supply of compressed fluid to the nozzle, so the high-pressure fluid jet is also interrupted.
  • the inventive device for abrasive fluid jet cutting according to claim 1 has the advantage that the abrasive is supplied with little effort, so that the abrasive supply can be integrated into the known apparatus without great technical effort.
  • the device for abrasive fluid jet cutting has a compressor unit for compressing a fluid that can be fed to a nozzle in the form of a high pressure fluid stream, the nozzle being designed to deliver a high pressure fluid jet.
  • an interrupter unit is provided by which the fluid flow to the nozzle can be interrupted or at least greatly throttled, the interrupter unit comprising a control chamber that can be filled with high-pressure fluid and that can be connected to a drain chamber via a control valve.
  • the amount of control fluid discharged via the control valve flows via a supply line into a mixing chamber, an abrasive channel carrying abrasive particles opening into the supply line so that the amount of control fluid enriched with abrasive particles mixes with the high-pressure fluid jet.
  • the control of the interrupter unit by means of a changing pressure in a control room makes it necessary that part of the pressure in the control room High pressure fluid is diverted.
  • This amount of fluid is used in the present device according to the invention to introduce the desired abrasive particles into the high-pressure fluid jet by introducing this amount mixed with the particles into a mixing chamber.
  • the amount of control fluid can be used sensibly, so that a channel with which this control amount is conveyed back into the tank can be dispensed with, and on the other hand, the abrasive particles can be well dosed and mixed with the high-pressure fluid jet.
  • the feed line is designed such that it opens into the mixing chamber off-center to the high-pressure fluid jet. This results in a swirl flow in the mixing chamber, which leads to better mixing of the control fluid quantity, which contains the abrasive particles, with the high-pressure fluid jet.
  • the mixing chamber is preferably arranged downstream of the nozzle, so that the abrasive particles are only added to the high-pressure jet after the nozzle and the abrasive particles do not lead to excessive stress on the nozzle and thus to a shortened service life of the nozzle.
  • the abrasive particles are already mixed with the amount of control fluid in the area where the abrasive channel opens into the supply line, with only a low pressure prevailing in the supply line so that the abrasive particles hardly cause any mechanical impairment of the supply line.
  • the interrupter unit comprises a movable control piston which delimits the control chamber that can be filled with the high-pressure fluid, so that a closing force can be exerted on the control piston by the pressure in the control chamber.
  • the movable control piston thus releases or interrupts the connection between the compressor unit and the nozzle, the piston working according to the known servo-hydraulic principle, which ensures quick switchability and high reliability.
  • the interrupter unit comprises a nozzle needle which interacts with a nozzle seat to interrupt the high-pressure fluid flow to the nozzle.
  • the nozzle needle limits the control chamber with its end face facing away from the nozzle seat, so that the nozzle needle is located moved in the longitudinal direction by the changing pressure in the control chamber and thereby interrupts or releases the high-pressure fluid flow to the nozzle.
  • This hydraulic principle is very similar to that of the control piston and has proven itself, for example, in the control of fuel injection in fuel injection valves.
  • the control valve is preferably designed as a solenoid valve, which on the one hand ensures high reliability and quick switchability and on the other hand can be manufactured relatively inexpensively.
  • FIG. 1 an inventive device for abrasive fluid jet cutting is shown schematically.
  • the device comprises a compressor unit 1, which comprises a fluid tank 2 and a high pressure pump 3.
  • the fluid that is to be used for fluid jet cutting is compressed by the high pressure pump 3 and fed to an interrupter unit 6 via a high pressure line 4.
  • the interrupter unit 6 comprises a cavity 8 formed in a housing 5, which is formed as a stepped bore and in its Side wall an annular space 11 is formed.
  • a high-pressure channel 12 leads from the annular space 11 to a nozzle 25 through which the compressed fluid is expelled and reaches a mixing chamber 27 which is formed in a collimator 31.
  • the high pressure fluid jet 33 emerges from the collimator 31 and strikes a workpiece 35, which is cut or decoated by the high pressure fluid jet 33.
  • a longitudinally movable control piston 7 is arranged, which is designed stepped so that its two end faces have a different diameter and accordingly a different area.
  • the control piston 7 interacts with a sealing seat 9, so that when the control piston 7 rests on the sealing seat 9, a connection between the high-pressure line 4 and the annular space 11 is interrupted.
  • the control piston 7 delimits the control chamber 108, which forms part of the cavity 8.
  • the control chamber 108 is hydraulically connected to the high-pressure line 4 via a longitudinal bore 10 formed in the control piston 7, so that the control chamber 108 has a connection to the high-pressure channel 4.
  • control chamber 108 To change the pressure in the control chamber 108, the latter can be connected to an outlet chamber 19 in which there is a low fluid pressure.
  • an outlet throttle 21 is provided which connects the control chamber 108 with the outlet chamber 19, wherein the outlet throttle 21 can be closed or opened by means of a control valve 14.
  • the control valve 14 is designed as a solenoid valve and comprises a magnet armature 15 with a sealing ball 17 which closes the outlet throttle 21 when it rests on a sealing seat.
  • the armature 15 can be moved in the longitudinal direction away from the outlet throttle 21 by an electromagnet 16, this movement occurring against the force of an armature spring 18, which is arranged under pressure bias in the outlet chamber 19 and the armature 15 and thus also the sealing ball 17 in the direction of The outlet throttle 21 is acted upon by a force.
  • a supply line 20 leads from the drain space 19 to the mixing chamber 27, so that fluid diverted into the drain space 19 from the control space 108 into the mixing chamber 27 drains.
  • An abrasive channel 22 opens into the supply line 20, via which abrasive particles from an abrasive container 23 can be introduced into the supply line 20 so that they mix with the amount of control fluid and enter the mixing chamber 27 together with the amount of control fluid.
  • the high-pressure fluid jet 33 mixes with the control fluid quantity, so that the fluid jet 33 ultimately emerging from the device contains highly compressed fluid together with abrasive particles.
  • This high-pressure fluid jet 33 hits a workpiece 35, the angle of incidence and the pressure as to whether the high-pressure fluid jet 33 divides the workpiece 35 or whether the high-pressure fluid jet 33 is suitable for stripping the workpiece, for example to remove a layer of paint or other coating from the workpiece .
  • the operation of the device is as follows: Due to the compressor unit 1, high pressure fluid is available under high pressure in the high pressure channel 4.
  • the high pressure fluid is preferably purified water. If the control piston 7 is in its closed position in contact with the sealing seat 9, it closes the high pressure channel 4 with respect to the annular space 11, so that no high pressure fluid jet 33 emerges from the nozzle 25. Via the longitudinal bore 10, the same high pressure prevails in the control chamber 108 as in the high pressure channel 4, so that the control piston 7 is held in its contact with the sealing seat 9.
  • the intermediate space formed by the stepped control piston 7 is connected to the drain space 19 via a relief channel 13, so that a significant excess of force always remains on the control piston 7 due to the pressure in the control space 108.
  • control valve 14 If a high pressure fluid jet is to be generated, the control valve 14 is actuated and the sealing ball 17 releases the discharge throttle 21. As a result, high pressure fluid flows from the control chamber 108 into the drain chamber 19 and thus reduces the pressure in the control chamber 108 and thus also the hydraulic force on the control piston 7. This moves in the direction of the control chamber 108 and provides the connection between the high pressure channel 4 and the annular chamber 11 free. As a result, high-pressure fluid flows through the high-pressure channel 12 and emerges from the nozzle 25.
  • the high-pressure fluid which is diverted into the drain space 19 by the open control valve 14, runs via the supply channel 20 in the direction of the mixing chamber 27.
  • the control fluid mixes with the particles, so that the mixture of control fluid and abrasive particles get into the mixing chamber 27.
  • the fluid mixes with the abrasive particles and the high pressure fluid jet 33, so that the high pressure fluid jet 33 ultimately emerging from the device is mixed with abrasive particles, which significantly increases the cutting effect on the workpiece 35.
  • This makes it possible to cut the workpiece with a relatively low pressure of, for example, 2000 bar (200 MPa), with the pulsating high pressure fluid jet cutting generally requiring less high pressure fluid than with continuous water jet cutting.
  • control valve 14 By closing the control valve 14, the previous pressure conditions on the control piston 7 are restored, so that the latter is pressed back into its closed position in contact with the valve seat 9 and the connection between the high pressure channel 4 and the high pressure channel 12 is interrupted again. By opening and closing the control valve 14, a pulsating high-pressure fluid jet 33 can be generated.
  • control amount that is necessarily controlled during operation of the servo-hydraulic control valve 14 can be used by the device described above to introduce the abrasive particles into the high-pressure fluid jet in a simple and precisely metered manner. This also eliminates the need to convey the diverted amount of fluid back into the tank, for example via another line.
  • FIG 2 a second embodiment of the device according to the invention is shown schematically.
  • the interrupter unit 6 is implemented here in the form of a nozzle 25 with a nozzle needle 28 embedded therein.
  • the nozzle needle 28 is arranged in a pressure chamber 26 within the nozzle 25 so as to be longitudinally displaceable and here assumes the function of the interrupter unit 6, that is to say the function of the control piston 7 in the exemplary embodiment Figure 1 .
  • the nozzle needle 28 interacts with a nozzle seat 29, so that when it rests on the nozzle seat 29, the connection between the pressure chamber 26 and the nozzle opening 30 is interrupted.
  • the pressure chamber 26 is thereby connected to the high pressure fluid by the compressor unit 1 Filled via a high pressure line 4.
  • a control chamber 108 is also used here, via which a changing fluid pressure in the control chamber 108 can be set.
  • the control chamber 108 is filled with fluid here via a branch of the high-pressure line 4 and can be relieved of pressure via the outlet throttle 21, also controlled here via a control valve 14, which is only shown schematically it is previously mixed with the abrasive particles via an abrasive line 22 opening into the supply line 20, as in the exemplary embodiment according to FIG Figure 1 .
  • the mixing chamber 27 is formed in a collimator 31 which accommodates part of the nozzle 25. The amount of control fluid that reaches the mixing chamber 27 via the supply channel 20 mixes in the mixing chamber 27 with the high-pressure fluid jet 33, so that a high-pressure fluid jet 33 mixed with abrasive particles emerges here as well.
  • FIG 3 a section through an exemplary embodiment of the mixing chamber 27, which can be provided both in the first and in the second embodiment.
  • the mixing chamber 27 is designed in such a way that the high-pressure fluid jet 33 is perpendicular to the plane of the drawing.
  • the feed channel 20 opens into the mixing chamber 27 eccentrically to the high pressure fluid jet 33, so that a slight swirl flow is generated within the mixing chamber 27.
  • the high pressure fluid jet 33 mixes effectively with the abrasive particles. These are sprayed out of the device together with the high pressure fluid jet 33.
  • Water is preferably used as the high-pressure fluid, but other liquids that can be correspondingly highly compressed are basically also suitable.
  • the added abrasive particles can be silicon carbide or silicon oxide, for example, the number and grain size of which can be used to adjust the effect.
  • the pressures with which the high-pressure fluid jet 33 leaves the device are typically 1500 to 2000 bar (150 to 200 MPa), but can also be lower, depending on the application. Basically, a lower pressure is sufficient for stripping a workpiece than for cutting a workpiece.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Nozzles (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum abrasiven Fluidstrahlschneiden wie sie beispielsweise benutzt wird, um Werkstoffe mittels eines Hochdruckfluidstrahls, dem abrasive Partikel beigemischt sind, zu schneiden oder zu entschichten.The invention relates to a device for abrasive fluid jet cutting as it is used, for example, to cut or decoat materials by means of a high pressure fluid jet to which abrasive particles are mixed.

Stand der TechnikState of the art

Aus dem Stand der Technik sind Vorrichtungen zum Fluidstrahlschneiden mit hohem Druck bekannt, wobei die Vorrichtungen auch zum Entschichten von Werkstücken verwendet werden können. So ist aus der DE 10 2014 222 299 A1 eine Vorrichtung gemäß dem Oberbegriff des unabhängigen Anspruchs 1 bekannt, bei der ein Fluid, vorzugsweise Wasser, mittels einer Hochdruckpumpe verdichtet und einer Düse zugeführt wird, die einen Hochdruckfluidstrahl abgeben kann. Die Düse ist dabei so ausgebildet, dass sie den Hochdruckfluidstrahl periodisch unterbrechen kann, so dass ein pulsierender Hochdruckfluidstrahl entsteht. Die eigentliche Unterbrechung des Hochdruckfluidstrahls geschieht dabei mittels eines beweglichen Steuerkolbens, der servohydraulisch betrieben wird, d.h. über einen wechselnden Druck in einem Steuerraum gesteuert wird. Der Steuerkolben weist zwei Stirnflächen auf, wobei eine Stirnfläche, die den Steuerraum begrenzt, größer als die gegenüberliegende Stirnfläche des Steuerkolbens ausgebildet ist. Wird der Druck in dem Steuerraum, der von der größeren Stirnfläche des Steuerkolbens begrenzt wird, abgesenkt, so bewegt sich der Steuerkolben bedingt durch die hydraulischen Kräfte in denselben hinein und gibt so die Verbindung zwischen einer Verdichtereinheit und der Düse frei, so dass ein Hochdruckfluidstrahl aus der Düse austritt, mit dem das Werkstück zerschnitten oder entschichtet werden kann. Wird der Druck im Steuerraum wieder erhöht, so bewegt sich der Steuerkolben zurück in seine Schließstellung und unterbricht die Zufuhr von verdichtetem Fluid zur Düse, so auch der Hochdruckfluidstrahl unterbrochen wird.Devices for fluid jet cutting at high pressure are known from the prior art, it also being possible for the devices to be used for stripping workpieces. So is from the DE 10 2014 222 299 A1 a device according to the preamble of independent claim 1 is known, in which a fluid, preferably water, is compressed by means of a high pressure pump and fed to a nozzle which can emit a high pressure fluid jet. The nozzle is designed so that it can periodically interrupt the high-pressure fluid jet, so that a pulsating high-pressure fluid jet is created. The actual interruption of the high-pressure fluid jet takes place by means of a movable control piston, which is operated servo-hydraulically, ie is controlled via a changing pressure in a control room. The control piston has two end faces, one end face which delimits the control chamber being larger than the opposite end face of the control piston. If the pressure in the control chamber, which is limited by the larger face of the control piston, is lowered, the control piston moves into the same due to the hydraulic forces and thus releases the connection between a compressor unit and the nozzle, so that a high-pressure fluid jet is emitted the nozzle exits with which the workpiece can be cut or stripped. If the pressure in the control chamber is increased again, the control piston moves back into its closed position and interrupts the supply of compressed fluid to the nozzle, so the high-pressure fluid jet is also interrupted.

Es ist auch bekannt, einem solchen Hochdruckfluidstrahl ein abrasives Medium beizumischen, um die Schneidwirkung zu verbessern. Die dem Hochdruckfluid beigemischten Partikel werden mit dem Hochdruckfluidstrahl beschleunigt und treffen zusammen mit diesem auf das zu bearbeitende Werkstück, was die Schneidwirkung bzw. Entschichtungswirkung deutlich verstärkt. Hierzu ist eine Mischeinrichtung erforderlich, mit der die abrasiven Partikel dem Hochdruckfluidstrahl zugeführt werden können. Entscheidend ist dabei, die Menge der Partikel genau zu steuern, damit die Schneid- bzw. Entschichtungswirkung optimiert wird.It is also known to add an abrasive medium to such a high-pressure fluid jet in order to improve the cutting effect. The particles mixed with the high-pressure fluid are accelerated with the high-pressure fluid jet and, together with this, hit the workpiece to be machined, which significantly increases the cutting effect or the decoating effect. A mixing device is required for this, with which the abrasive particles can be fed to the high-pressure fluid jet. It is crucial to precisely control the amount of particles so that the cutting and stripping effect is optimized.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Vorrichtung zum abrasiven Fluidstrahlschneiden gemäß Anspruch 1 weist demgegenüber den Vorteil auf, dass die Zuführung der Abrasivmittel mit geringem Aufwand geschieht, so dass die Abrasivmittelzuführung ohne großen technischen Aufwand in die bekannten Apparaturen integriert werden kann. Dazu weist die Vorrichtung zum abrasiven Fluidstrahlschneiden eine Verdichtereinheit zur Verdichtung eines Fluids auf, das in Form eines Hochdruckfluidstroms einer Düse zuführbar ist, wobei die Düse zur Abgabe eines Hochdruckfluidstrahls ausgebildet ist. Weiter ist eine Unterbrechereinheit vorgesehen, durch die der Fluidstrom zur Düse unterbrochen oder zumindest stark gedrosselt werden kann, wobei die Unterbrechereinheit einen mit Hochdruckfluid befüllbaren Steuerraum umfasst, der über ein Steuerventil mit einem Ablaufraum verbindbar ist. Die über das Steuerventil abgeführte Steuerfluidmenge fließt über eine Zufuhrleitung in eine Mischkammer, wobei ein Abrasivpartikel führender Abrasivkanal in die Zufuhrleitung mündet, so dass sich die mit abrasiven Partikeln angereicherte Steuerfluidmenge mit dem Hochdruckfluidstrahl mischt.The inventive device for abrasive fluid jet cutting according to claim 1 has the advantage that the abrasive is supplied with little effort, so that the abrasive supply can be integrated into the known apparatus without great technical effort. For this purpose, the device for abrasive fluid jet cutting has a compressor unit for compressing a fluid that can be fed to a nozzle in the form of a high pressure fluid stream, the nozzle being designed to deliver a high pressure fluid jet. Furthermore, an interrupter unit is provided by which the fluid flow to the nozzle can be interrupted or at least greatly throttled, the interrupter unit comprising a control chamber that can be filled with high-pressure fluid and that can be connected to a drain chamber via a control valve. The amount of control fluid discharged via the control valve flows via a supply line into a mixing chamber, an abrasive channel carrying abrasive particles opening into the supply line so that the amount of control fluid enriched with abrasive particles mixes with the high-pressure fluid jet.

Die Steuerung der Unterbrechereinheit mittels eines wechselnden Drucks in einem Steuerraum macht es erforderlich, dass ein Teil des im Steuerraum befindlichen Hochdruckfluids abgesteuert wird. Diese Fluidmenge wird in der vorliegenden erfindungsgemäßen Vorrichtung dazu benutzt, die gewünschten Abrasivpartikel in den Hochdruckfluidstrahl einzubringen, indem diese Menge vermischt mit den Partikeln in eine Mischkammer eingebracht wird. Damit lässt sich zum einen die Steuerfluidmenge sinnvoll nutzen, so dass ein Kanal, mit dem diese Steuermenge zurück in den Tank befördert wird, entfallen kann, und zum anderen lassen sich so die Abrasivpartikel gut dosieren und dem Hochdruckfluidstrahl beimischen.The control of the interrupter unit by means of a changing pressure in a control room makes it necessary that part of the pressure in the control room High pressure fluid is diverted. This amount of fluid is used in the present device according to the invention to introduce the desired abrasive particles into the high-pressure fluid jet by introducing this amount mixed with the particles into a mixing chamber. In this way, on the one hand, the amount of control fluid can be used sensibly, so that a channel with which this control amount is conveyed back into the tank can be dispensed with, and on the other hand, the abrasive particles can be well dosed and mixed with the high-pressure fluid jet.

In einer ersten vorteilhaften Ausgestaltung der Erfindung ist die Zuführleitung so ausgebildet, dass sie außermittig zum Hochdruckfluidstrahl in die Mischkammer mündet. Dadurch ergibt sich in der Mischkammer eine Drallströmung, die zu einer besseren Durchmischung der Steuerfluidmenge, die die Abrasivpartikel beinhaltet, mit dem Hochdruckfluidstrahl führt. Dabei ist die Mischkammer der Düse vorzugsweise nachgeordnet, so dass die Abrasivpartikel erst nach der Düse dem Hochdruckstrahl beigemischt werden und die Abrasivpartikel nicht zu einer übergroßen Belastung der Düse und damit zu einer verkürzten Lebensdauer der Düse führt. Dabei werden die Abrasivpartikel bereits im Bereich der Mündung des Abrasivkanals in die Zuführleitung mit der Steuerfluidmenge vermischt, wobei in der Zuführleitung nur ein geringer Druck herrscht, so dass die Abrasivpartikel kaum zu einer mechanischen Beeinträchtigung der Zuführleitung führen.In a first advantageous embodiment of the invention, the feed line is designed such that it opens into the mixing chamber off-center to the high-pressure fluid jet. This results in a swirl flow in the mixing chamber, which leads to better mixing of the control fluid quantity, which contains the abrasive particles, with the high-pressure fluid jet. The mixing chamber is preferably arranged downstream of the nozzle, so that the abrasive particles are only added to the high-pressure jet after the nozzle and the abrasive particles do not lead to excessive stress on the nozzle and thus to a shortened service life of the nozzle. The abrasive particles are already mixed with the amount of control fluid in the area where the abrasive channel opens into the supply line, with only a low pressure prevailing in the supply line so that the abrasive particles hardly cause any mechanical impairment of the supply line.

In einer weiteren vorteilhaften Ausgestaltung umfasst die Unterbrechereinheit einen beweglichen Steuerkolben, welcher den mit dem Hochdruckfluid befüllbaren Steuerraum begrenzt, so dass durch den Druck im Steuerraum eine Schließkraft auf den Steuerkolben ausgeübt werden kann. Der bewegliche Steuerkolben gibt so die Verbindung zwischen der Verdichtereinheit und der Düse frei oder unterbricht dies, wobei der Kolben nach dem bekannten servo-hydraulischen Prinzip arbeitet, was eine schnelle Schaltbarkeit und eine hohe Zuverlässigkeit gewährleistet.In a further advantageous embodiment, the interrupter unit comprises a movable control piston which delimits the control chamber that can be filled with the high-pressure fluid, so that a closing force can be exerted on the control piston by the pressure in the control chamber. The movable control piston thus releases or interrupts the connection between the compressor unit and the nozzle, the piston working according to the known servo-hydraulic principle, which ensures quick switchability and high reliability.

In einer weiteren vorteilhaften Ausgestaltung umfasst die Unterbrechereinheit eine Düsennadel, die mit einem Düsensitz zum Unterbrechen des Hochdruckfluidstroms zur Düse zusammenwirkt. Dabei begrenzt die Düsennadel mit ihrer dem Düsensitz abgewandten Stirnfläche den Steuerraum, so dass sich die Düsennadel durch den wechselnden Druck im Steuerraum in Längsrichtung bewegt und dadurch den Hochdruckfluidstrom zur Düse unterbricht oder freigibt. Dieses hydraulische Prinzip ist sehr ähnlich zu dem des Steuerkolbens und hat sich beispielsweise bei der Steuerung der Kraftstoffeinspritzung bei Kraftstoffeinspritzventilen bewährt. Das Steuerventil ist dabei vorzugsweise als Magnetventil ausgestaltet, was einerseits eine hohe Zuverlässigkeit und schnelle Schaltbarkeit sicherstellt und andererseits relativ kostengünstig herstellbar ist. Es ist aber auch möglich, statt des Magnetventils ein Piezoventil vorzusehen, bei dem das Schließelement des Steuerventils durch einen Piezoaktor bewegt wird.In a further advantageous embodiment, the interrupter unit comprises a nozzle needle which interacts with a nozzle seat to interrupt the high-pressure fluid flow to the nozzle. The nozzle needle limits the control chamber with its end face facing away from the nozzle seat, so that the nozzle needle is located moved in the longitudinal direction by the changing pressure in the control chamber and thereby interrupts or releases the high-pressure fluid flow to the nozzle. This hydraulic principle is very similar to that of the control piston and has proven itself, for example, in the control of fuel injection in fuel injection valves. The control valve is preferably designed as a solenoid valve, which on the one hand ensures high reliability and quick switchability and on the other hand can be manufactured relatively inexpensively. However, it is also possible to provide a piezo valve instead of the solenoid valve, in which the closing element of the control valve is moved by a piezo actuator.

Zeichnungdrawing

In der Zeichnung sind erfindungsgemäße Ausführungsbeispiele dargestellt. So zeigt

Figur 1
eine erste erfindungsgemäße Vorrichtung in schematischer Darstellung,
Figur 2
ein zweites Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung und
Figur 3
eine Detailansicht der Mischkammer, in der die abrasiven Partikel dem Hochdruckfluidstrahl beigemischt werden.
Exemplary embodiments according to the invention are shown in the drawing. So shows
Figure 1
a first device according to the invention in a schematic representation,
Figure 2
a second embodiment of a device according to the invention and
Figure 3
a detailed view of the mixing chamber in which the abrasive particles are mixed with the high pressure fluid jet.

Beschreibung der AusführungsbeispieleDescription of the exemplary embodiments

In Figur 1 ist eine erfindungsgemäße Vorrichtung zum abrasiven Fluidstrahlschneiden schematisch dargestellt. Die Vorrichtung umfasst eine Verdichtereinheit 1, die einen Fluidtank 2 und eine Hochdruckpumpe 3 umfasst. Durch die Hochdruckpumpe 3 wird das Fluid, das zum Fluidstrahlschneiden verwendet werden soll, verdichtet und über eine Hochdruckleitung 4 einer Unterbrechereinheit 6 zugeführt. Die Unterbrechereinheit 6 umfasst einen in einem Gehäuse 5 ausgebildeten Hohlraum 8, der als gestufte Bohrung ausgebildet ist und in dessen Seitenwand ein Ringraum 11 ausgebildet ist. Vom Ringraum 11 führt ein Hochruckkanal 12 zu einer Düse 25, durch die das verdichtete Fluid ausgedüst wird und in eine Mischkammer 27 gelangt, die in einem Kollimator 31 ausgebildet ist. Schließlich tritt der Hochdruckfluidstrahl 33 aus dem Kollimator 31 aus und trifft auf ein Werkstück 35, das durch den Hochdruckfluidstrahl 33 zerschnitten bzw. entschichtet wird.In Figure 1 an inventive device for abrasive fluid jet cutting is shown schematically. The device comprises a compressor unit 1, which comprises a fluid tank 2 and a high pressure pump 3. The fluid that is to be used for fluid jet cutting is compressed by the high pressure pump 3 and fed to an interrupter unit 6 via a high pressure line 4. The interrupter unit 6 comprises a cavity 8 formed in a housing 5, which is formed as a stepped bore and in its Side wall an annular space 11 is formed. A high-pressure channel 12 leads from the annular space 11 to a nozzle 25 through which the compressed fluid is expelled and reaches a mixing chamber 27 which is formed in a collimator 31. Finally, the high pressure fluid jet 33 emerges from the collimator 31 and strikes a workpiece 35, which is cut or decoated by the high pressure fluid jet 33.

Im Steuerraum 108 ist ein längsbeweglicher Steuerkolben 7 angeordnet, der gestuft ausgebildet ist, so dass seine beiden Stirnseiten einen unterschiedlichen Durchmesser und dementsprechend eine unterschiedliche Fläche aufweisen. Auf der in der Figur 1 linken Stirnseite des Steuerkolbens 7, die eine kleinere Fläche aufweist als die gegenüberliegende Stirnseite, wirkt der Steuerkolben 7 mit einem Dichtsitz 9 zusammen, so dass bei Anlage des Steuerkolbens 7 am Dichtsitz 9 eine Verbindung der Hochdruckleitung 4 zu dem Ringraum 11 unterbrochen wird. Mit seiner in der Zeichnung rechten Stirnseite begrenzt der Steuerkolben 7 den Steuerraum 108, der einen Teil des Hohlraums 8 bildet. Der Steuerraum 108 ist mit der Hochruckleitung 4 über eine im Steuerkolben 7 ausgebildete Längsbohrung 10 hydraulisch verbunden, so dass der Steuerraum 108 eine Verbindung zum Hochdruckkanal 4 aufweist.In the control chamber 108, a longitudinally movable control piston 7 is arranged, which is designed stepped so that its two end faces have a different diameter and accordingly a different area. On the in the Figure 1 On the left end of the control piston 7, which has a smaller area than the opposite end, the control piston 7 interacts with a sealing seat 9, so that when the control piston 7 rests on the sealing seat 9, a connection between the high-pressure line 4 and the annular space 11 is interrupted. With its end face on the right in the drawing, the control piston 7 delimits the control chamber 108, which forms part of the cavity 8. The control chamber 108 is hydraulically connected to the high-pressure line 4 via a longitudinal bore 10 formed in the control piston 7, so that the control chamber 108 has a connection to the high-pressure channel 4.

Zur Änderung des Drucks im Steuerraum 108 ist dieser mit einem Ablaufraum 19 verbindbar, in dem ein niedriger Fluiddruck herrscht. Dazu ist eine Ablaufdrossel 21 vorgesehen, die den Steuerraum 108 mit dem Ablaufraum 19 verbindet, wobei die Ablaufdrossel 21 mittels eines Steuerventils 14 verschlossen oder geöffnet werden kann. Das Steuerventil 14 ist als Magnetventil ausgebildet und umfasst einen Magnetanker 15 mit einer Dichtkugel 17, die die Ablaufdrossel 21 bei Anlage auf einem Dichtsitz verschließt. Der Magnetanker 15 kann durch einen Elektromagneten 16 in Längsrichtung weg von der Ablaufdrossel 21 bewegt werden, wobei diese Bewegung entgegen der Kraft einer Ankerfeder 18 geschieht, die unter Druckvorspannung im Ablaufraum 19 angeordnet ist und den Magnetanker 15 und damit auch die Dichtkugel 17 in Richtung der Ablaufdrossel 21 mit einer Kraft beaufschlagt.To change the pressure in the control chamber 108, the latter can be connected to an outlet chamber 19 in which there is a low fluid pressure. For this purpose, an outlet throttle 21 is provided which connects the control chamber 108 with the outlet chamber 19, wherein the outlet throttle 21 can be closed or opened by means of a control valve 14. The control valve 14 is designed as a solenoid valve and comprises a magnet armature 15 with a sealing ball 17 which closes the outlet throttle 21 when it rests on a sealing seat. The armature 15 can be moved in the longitudinal direction away from the outlet throttle 21 by an electromagnet 16, this movement occurring against the force of an armature spring 18, which is arranged under pressure bias in the outlet chamber 19 and the armature 15 and thus also the sealing ball 17 in the direction of The outlet throttle 21 is acted upon by a force.

Vom Ablaufraum 19 führt eine Zufuhrleitung 20 zur Mischkammer 27, so dass in den Ablaufraum 19 abgesteuertes Fluid aus dem Steuerraum 108 in die Mischkammer 27 abfließt. In die Zuführleitung 20 mündet ein Abrasivkanal 22, über den abrasive Partikel aus einem Abrasivmittelbehälter 23 in die Zuführleitung 20 eingebracht werden können, so dass diese sich mit der Steuerfluidmenge vermischen und zusammen mit der Steuerfluidmenge in die Mischkammer 27 gelangen. In der Mischkammer 27 vermischt sich der Hochdruckfluidstrahl 33 mit der Steuerfluidmenge, so dass der letztlich aus der Vorrichtung austretende Fluidstrahl 33 hochverdichtetes Fluid zusammen mit abrasiven Partikeln enthält. Dieser Hochdruckfluidstrahl 33 trifft auf ein Werkstück 35, wobei vom Auftreffwinkel und vom Druck abhängt, ob der Hochdruckfluidstrahl 33 das Werkstück 35 zerteilt oder ob der Hochdruckfluidstrahl 33 geeignet ist, das Werkstück zu entschichten, um beispielsweise eine Farbschicht oder eine sonstige Beschichtung vom Werkstück zu entfernen.A supply line 20 leads from the drain space 19 to the mixing chamber 27, so that fluid diverted into the drain space 19 from the control space 108 into the mixing chamber 27 drains. An abrasive channel 22 opens into the supply line 20, via which abrasive particles from an abrasive container 23 can be introduced into the supply line 20 so that they mix with the amount of control fluid and enter the mixing chamber 27 together with the amount of control fluid. In the mixing chamber 27, the high-pressure fluid jet 33 mixes with the control fluid quantity, so that the fluid jet 33 ultimately emerging from the device contains highly compressed fluid together with abrasive particles. This high-pressure fluid jet 33 hits a workpiece 35, the angle of incidence and the pressure as to whether the high-pressure fluid jet 33 divides the workpiece 35 or whether the high-pressure fluid jet 33 is suitable for stripping the workpiece, for example to remove a layer of paint or other coating from the workpiece .

Die Funktionsweise der Vorrichtung ist wie folgt:
Durch die Verdichtereinheit 1 steht im Hochdruckkanal 4 Hochdruckfluid unter hohem Druck an. Das Hochdruckfluid ist dabei vorzugsweise gereinigtes Wasser. Ist der Steuerkolben 7 in seiner Schließstellung in Anlage am Dichtsitz 9, so verschließt er den Hochdruckkanal 4 gegenüber dem Ringraum 11, so dass kein Hochdruckfluidstrahl 33 aus der Düse 25 austritt. Über die Längsbohrung 10 herrscht auch im Steuerraum 108 derselbe Hochdruck wie im Hochdruckkanal 4, so dass der Steuerkolben 7 in seiner Anlage am Dichtsitz 9 gehalten wird. Dabei ist der Zwischenraum, der durch den gestuften Steuerkolben 7 gebildet wird, über einen Entlastungskanal 13 mit dem Ablaufraum 19 verbunden, so dass stets ein deutlicher Kraftüberschuss durch den Druck im Steuerraum 108 auf den Steuerkolben 7 verbleibt. Soll ein Hochdruckfluidstrahl erzeugt werden, so wird das Steuerventil 14 betätigt und die Dichtkugel 17 gibt die Ablaufdrossel 21 frei. Dadurch strömt Hochdruckfluid aus dem Steuerraum 108 in den Ablaufraum 19 und verringert so den Druck im Steuerraum 108 und damit auch die hydraulische Kraft auf den Steuerkolben 7. Dieser bewegt sich damit in Richtung des Steuerraums 108 und gibt die Verbindung zwischen dem Hochdruckkanal 4 und dem Ringraum 11 frei. Dadurch strömt Hochdruckfluid über den Hochdruckkanal 12 und tritt aus der Düse 25 aus.The operation of the device is as follows:
Due to the compressor unit 1, high pressure fluid is available under high pressure in the high pressure channel 4. The high pressure fluid is preferably purified water. If the control piston 7 is in its closed position in contact with the sealing seat 9, it closes the high pressure channel 4 with respect to the annular space 11, so that no high pressure fluid jet 33 emerges from the nozzle 25. Via the longitudinal bore 10, the same high pressure prevails in the control chamber 108 as in the high pressure channel 4, so that the control piston 7 is held in its contact with the sealing seat 9. The intermediate space formed by the stepped control piston 7 is connected to the drain space 19 via a relief channel 13, so that a significant excess of force always remains on the control piston 7 due to the pressure in the control space 108. If a high pressure fluid jet is to be generated, the control valve 14 is actuated and the sealing ball 17 releases the discharge throttle 21. As a result, high pressure fluid flows from the control chamber 108 into the drain chamber 19 and thus reduces the pressure in the control chamber 108 and thus also the hydraulic force on the control piston 7. This moves in the direction of the control chamber 108 and provides the connection between the high pressure channel 4 and the annular chamber 11 free. As a result, high-pressure fluid flows through the high-pressure channel 12 and emerges from the nozzle 25.

Das Hochdruckfluid, das in den Ablaufraum 19 abgesteuert wird durch das geöffnete Steuerventil 14, läuft über den Zufuhrkanal 20 in Richtung der Mischkammer 27. Am Zusammenfluss der Zuführleitung 20 mit dem Abrasivkanal 22 vermischt sich das Steuerfluid mit den Partikeln, so dass das Gemisch aus Steuerfluid und abrasiven Partikeln in die Mischkammer 27 gelangt. Dort vermischt sich das Fluid mit den abrasiven Partikeln und dem Hochdruckfluidstrahl 33, so dass der letztlich aus der Vorrichtung austretende Hochdruckfluidstrahl 33 mit abrasiven Partikeln versetzt ist, was die Schneidwirkung auf das Werkstück 35 deutlich erhöht. Dadurch ist es möglich, das Werkstück auch mit einem relativ geringen Druck von beispielsweise 2000 bar (200 MPa) zu schneiden, wobei allgemein durch das pulsierende Hochdruckfluidstrahlschneiden bereits weniger Hochdruckfluid benötigt wird als beim kontinuierlichen Wasserstrahlschneiden. Durch das Schließen des Steuerventils 14 stellen sich die vorherigen Druckverhältnisse am Steuerkolben 7 wieder ein, so dass dieser zurück in seine Schließstellung in Anlage an den Ventilsitz 9 gedrückt wird und die Verbindung zwischen dem Hochdruckkanal 4 und dem Hochdruckkanal 12 wieder unterbricht. Durch Öffnen und Schließen des Steuerventils 14 kann so ein pulsierender Hochdruckfluidstrahl 33 erzeugt werden.The high-pressure fluid, which is diverted into the drain space 19 by the open control valve 14, runs via the supply channel 20 in the direction of the mixing chamber 27. At the confluence of the supply line 20 with the abrasive channel 22, the control fluid mixes with the particles, so that the mixture of control fluid and abrasive particles get into the mixing chamber 27. There the fluid mixes with the abrasive particles and the high pressure fluid jet 33, so that the high pressure fluid jet 33 ultimately emerging from the device is mixed with abrasive particles, which significantly increases the cutting effect on the workpiece 35. This makes it possible to cut the workpiece with a relatively low pressure of, for example, 2000 bar (200 MPa), with the pulsating high pressure fluid jet cutting generally requiring less high pressure fluid than with continuous water jet cutting. By closing the control valve 14, the previous pressure conditions on the control piston 7 are restored, so that the latter is pressed back into its closed position in contact with the valve seat 9 and the connection between the high pressure channel 4 and the high pressure channel 12 is interrupted again. By opening and closing the control valve 14, a pulsating high-pressure fluid jet 33 can be generated.

Die Steuermenge, die notwendigerweise beim Betrieb des servo-hydraulischen Steuerventils 14 abgesteuert wird, kann durch die oben beschriebene Vorrichtung genutzt werden, um die abrasiven Partikel einfach und genau dosiert in den Hochdruckfluidstrahl einzubringen. Damit entfällt auch die Notwendigkeit, die abgesteuerte Fluidmenge beispielsweise über eine weitere Leitung wieder zurück in den Tank zu fördern.The control amount that is necessarily controlled during operation of the servo-hydraulic control valve 14 can be used by the device described above to introduce the abrasive particles into the high-pressure fluid jet in a simple and precisely metered manner. This also eliminates the need to convey the diverted amount of fluid back into the tank, for example via another line.

In Figur 2 ist ein zweites Ausführungsbeispiel der erfindungsgemäßen Vorrichtung schematisch dargestellt. Die Unterbrechereinheit 6 ist hier in Form einer Düse 25 mit darin eingebetteter Düsennadel 28 realisiert. Die Düsennadel 28 ist in einem Druckraum 26 innerhalb der Düse 25 längsverschiebbar angeordnet und übernimmt hier die Funktion der Unterbrechereinheit 6, also die Funktion des Steuerkolbens 7 im Ausführungsbeispiel nach Figur 1. Die Düsennadel 28 wirkt mit einem Düsensitz 29 zusammen, so dass bei Anlage am Düsensitz 29 die Verbindung des Druckraums 26 zur Düsenöffnung 30 unterbrochen wird. Der Druckraum 26 wird dabei durch die Verdichtereinheit 1 mit dem Hochdruckfluid über eine Hochdruckleitung 4 befüllt. Zur Bewegung der Düsennadel 28 in der Düse 25 dient auch hier ein Steuerraum 108, über den ein wechselnder Fluiddruck im Steuerraum 108 einstellbar ist. Der Steuerraum 108 wird hier über einen Abzweig der Hochdruckleitung 4 mit Fluid befüllt und kann über die Ablaufdrossel 21 druckentlastet werden, auch hier gesteuert über ein nur schematisch dargestelltes Steuerventil 14. Auch diese abgesteuerte Fluidmenge wird über eine Zuführleitung 20 in eine Mischkammer 27 geleitet, wobei sie zuvor über eine in die Zuführleitung 20 mündende Abrasivleitung 22 mit den abrasiven Partikeln vermischt wird, wie schon beim Ausführungsbeispiel nach Figur 1. Die Mischkammer 27 ist in einem Kollimator 31 ausgebildet, der einen Teil der Düse 25 aufnimmt. Die Steuerfluidmenge, die über den Zuführkanal 20 in die Mischkammer 27 gelangt, vermischt sich in der Mischkammer 27 mit dem Hochdruckfluidstrahl 33, so dass letztlich auch hier ein mit abrasiven Partikeln vermischter Hochdruckfluidstrahl 33 austritt.In Figure 2 a second embodiment of the device according to the invention is shown schematically. The interrupter unit 6 is implemented here in the form of a nozzle 25 with a nozzle needle 28 embedded therein. The nozzle needle 28 is arranged in a pressure chamber 26 within the nozzle 25 so as to be longitudinally displaceable and here assumes the function of the interrupter unit 6, that is to say the function of the control piston 7 in the exemplary embodiment Figure 1 . The nozzle needle 28 interacts with a nozzle seat 29, so that when it rests on the nozzle seat 29, the connection between the pressure chamber 26 and the nozzle opening 30 is interrupted. The pressure chamber 26 is thereby connected to the high pressure fluid by the compressor unit 1 Filled via a high pressure line 4. To move the nozzle needle 28 in the nozzle 25, a control chamber 108 is also used here, via which a changing fluid pressure in the control chamber 108 can be set. The control chamber 108 is filled with fluid here via a branch of the high-pressure line 4 and can be relieved of pressure via the outlet throttle 21, also controlled here via a control valve 14, which is only shown schematically it is previously mixed with the abrasive particles via an abrasive line 22 opening into the supply line 20, as in the exemplary embodiment according to FIG Figure 1 . The mixing chamber 27 is formed in a collimator 31 which accommodates part of the nozzle 25. The amount of control fluid that reaches the mixing chamber 27 via the supply channel 20 mixes in the mixing chamber 27 with the high-pressure fluid jet 33, so that a high-pressure fluid jet 33 mixed with abrasive particles emerges here as well.

Zur besseren Durchmischung des Hochdruckfluidstrahls 33 mit den Partikeln zeigt Figur 3 einen Schnitt durch ein Ausführungsbespiel der Mischkammer 27, die sowohl im ersten wie auch im zweiten Ausführungsbeispiel vorgesehen sein kann. Dabei ist die Mischkammer 27 so gestaltet, dass der Hochdruckfluidstrahl 33 senkrecht zur Zeichnungsebene ist. Der Zuführkanal 20 mündet in die Mischkammer 27 außermittig zum Hochdruckfluidstrahl 33, so dass eine leichte Drallströmung innerhalb der Mischkammer 27 erzeugt wird. Dadurch vermischt sich der Hochdruckfluidstrahl 33 effektiv mit den abrasiven Partikeln. Diese werden zusammen mit dem Hochdruckfluidstrahl 33 aus der Vorrichtung ausgedüst.For better mixing of the high pressure fluid jet 33 with the particles shows Figure 3 a section through an exemplary embodiment of the mixing chamber 27, which can be provided both in the first and in the second embodiment. The mixing chamber 27 is designed in such a way that the high-pressure fluid jet 33 is perpendicular to the plane of the drawing. The feed channel 20 opens into the mixing chamber 27 eccentrically to the high pressure fluid jet 33, so that a slight swirl flow is generated within the mixing chamber 27. As a result, the high pressure fluid jet 33 mixes effectively with the abrasive particles. These are sprayed out of the device together with the high pressure fluid jet 33.

Als Hochdruckfluid dient vorzugsweise Wasser, aber es sind auch andere Flüssigkeiten, die sich entsprechend hochverdichten lassen, grundsätzlich geeignet. Die beigemischten abrasiven Partikel können beispielsweise Siliziumcarbit oder Siliziumoxid sein, über deren Anzahl und Korngröße die Wirkung eingestellt werden kann. Die Drücke, mit denen der Hochdruckfluidstrahl 33 die Vorrichtung verlässt, betragen typischerweise 1500 bis 2000 bar (150 bis 200 MPa), können jedoch auch niedriger sein, was von der Anwendung abhängt. Grundsätzlich ist für eine Entschichtung eines Werkstücks ein niedrigerer Druck ausreichend als für ein Zerschneiden eines Werkstücks.Water is preferably used as the high-pressure fluid, but other liquids that can be correspondingly highly compressed are basically also suitable. The added abrasive particles can be silicon carbide or silicon oxide, for example, the number and grain size of which can be used to adjust the effect. The pressures with which the high-pressure fluid jet 33 leaves the device are typically 1500 to 2000 bar (150 to 200 MPa), but can also be lower, depending on the application. Basically, a lower pressure is sufficient for stripping a workpiece than for cutting a workpiece.

Claims (8)

  1. Apparatus for abrasive fluid-jet cutting with a compressor unit (1) for compressing a fluid which can be fed to a nozzle (25) in the form of a stream of high-pressure fluid, wherein the nozzle (25) is designed for discharging a high-pressure fluid jet (33), and with an interrupter unit (6) by way of which the stream of fluid to the nozzle (25) can be interrupted or at least severely restricted, wherein the interrupter unit (6) comprises a control chamber (8) which can be filled with high-pressure fluid and can be connected to a drainage chamber (19) via a control valve (14),
    characterized in that
    the quantity of control fluid which is removed via the control valve (14) opens out into a mixing chamber (27) via a feed line (20), wherein an abrasive channel (22) carrying abrasive particles opens out into the feed line (20) and the quantity of control fluid mixes with the high-pressure fluid jet (33).
  2. Apparatus according to Claim 1, characterized in that the feed line (20) opens out into the mixing chamber (27) eccentrically in relation to the high-pressure fluid jet (33).
  3. Apparatus according to Claim 1, characterized in that the mixing chamber (27) is arranged downstream of the nozzle (25).
  4. Apparatus according to Claim 1, characterized in that the abrasive channel (22) opens out into the feed line (20) such that the abrasive particles are mixed with the quantity of control fluid in the abrasive channel (22) .
  5. Apparatus according to Claim 1, characterized in that the interrupter unit (6) has a movable control piston (7) which delimits the control chamber (8) which can be filled with the high-pressure fluid, so that a closing force can be exerted onto the control piston (7) by the pressure in the control chamber (8).
  6. Apparatus according to Claim 5, characterized in that the control piston (7) interacts with a sealing seat (9) for opening and closing a connection between the compressor unit (1) and the nozzle (25).
  7. Apparatus according to Claim 1, characterized in that the interrupter unit (6) comprises a nozzle needle (28) which interacts with a nozzle seat (29) for interrupting the stream of high-pressure fluid to the nozzle (25), wherein the nozzle needle (28) delimits the control chamber (8) by way of its end face which is averted from the nozzle seat (29).
  8. Apparatus according to Claim 1, characterized in that the control valve (14) is configured as a solenoid valve.
EP17787120.9A 2016-10-25 2017-10-04 Device for abrasive fluid-jet cutting Active EP3532245B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016220926.4A DE102016220926A1 (en) 2016-10-25 2016-10-25 Apparatus for abrasive fluid jet cutting
PCT/EP2017/075117 WO2018077576A1 (en) 2016-10-25 2017-10-04 Device for abrasive fluid-jet cutting

Publications (2)

Publication Number Publication Date
EP3532245A1 EP3532245A1 (en) 2019-09-04
EP3532245B1 true EP3532245B1 (en) 2020-08-12

Family

ID=60143676

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17787120.9A Active EP3532245B1 (en) 2016-10-25 2017-10-04 Device for abrasive fluid-jet cutting

Country Status (3)

Country Link
EP (1) EP3532245B1 (en)
DE (1) DE102016220926A1 (en)
WO (1) WO2018077576A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017205682A1 (en) 2017-04-04 2018-10-04 Robert Bosch Gmbh Apparatus and method for high pressure fluid jet cutting
DE102019004686A1 (en) * 2019-06-28 2020-12-31 Technische Universität Chemnitz Method for machining a cutting edge of a cutting or cutting tool and device for carrying out the method
DE102019004685A1 (en) * 2019-06-28 2020-12-31 Technische Universität Chemnitz Process for material removal from a semi-finished product surface
CN110948396B (en) * 2019-12-06 2020-12-22 扬州瑞顺投资咨询有限公司 University's laboratory high efficiency equidistance particle cutting device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0445104A3 (en) * 1990-02-27 1992-08-05 Boehler Gesellschaft M.B.H. Method and device for entraining solid particles in a fluidic cutting stream
GB9719550D0 (en) * 1997-09-16 1997-11-19 Miller Donald S Fluid abrasive jets for machining
DE102008008701A1 (en) * 2008-02-11 2009-09-10 Hammelmann Maschinenfabrik Gmbh Method for manufacturing water abrasive jet, involves supplying abrasive agent under high pressure water jet according to injector principle, and interrupting water jet before supplying abrasive agent
DE102014100839B4 (en) * 2014-01-24 2015-10-15 Gottfried Wilhelm Leibniz Universität Hannover Water abrasive suspension cutting device, method for its control and computer program
DE102014222299A1 (en) 2014-10-31 2016-05-04 Robert Bosch Gmbh Apparatus for erosive processing and / or for cleaning a material or a workpiece surface by means of at least one high-pressure fluid jet and method for operating such a device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3532245A1 (en) 2019-09-04
WO2018077576A1 (en) 2018-05-03
DE102016220926A1 (en) 2018-04-26

Similar Documents

Publication Publication Date Title
EP3532245B1 (en) Device for abrasive fluid-jet cutting
EP0183093B1 (en) Hydraulic percussion device
DE10123775B4 (en) Fuel injection device for internal combustion engines, in particular common rail injector, and fuel system and internal combustion engine
EP0960274A1 (en) Fuel injection device for internal combustion engines
DE3231853C2 (en)
EP3271121B1 (en) Device and method for cutting a good to be cut by means of a fluid
EP0040371B1 (en) Injection nozzle for mixing heads for the production of a reactive mixture to form a homogeneous material or foam from at least two inter-reacting components
EP0347581B1 (en) Injection pump for internal-combustion engines
DE102014222299A1 (en) Apparatus for erosive processing and / or for cleaning a material or a workpiece surface by means of at least one high-pressure fluid jet and method for operating such a device
DE112004000565T5 (en) Switching a fluid flow by diverting
DE4404925A1 (en) High pressure cleaning device
EP0067144B1 (en) Cooling device for the tools of a continuous mining machine
EP3006723A1 (en) Fuel injection valve
WO2018114270A1 (en) Device for generating a fluid jet
DE3033266C2 (en) Pump for two-component synthetic resin
DE2155701C3 (en) Hydraulic hammer
EP4172486A1 (en) Flow limiter for a fuel injection system, and fuel injection system comprising a flow limiter
DE102018207717A1 (en) Apparatus for generating a high pressure fluid jet
AT512423A1 (en) INJECTION NOZZLE FOR INJECTING MEDIA TO THE COMBUSTION ENGINE OF AN INTERNAL COMBUSTION ENGINE
EP3530408A1 (en) Apparatus for high pressure fluid jet cutting
DE102005023179B3 (en) Injection valve for common rail fuel injection system has drain chamber connected to leakage drilling via restrictor which creates back-pressure to reduce flow of fuel via sealing gaps into drain chamber
EP4077908B1 (en) Injection nozzle for injecting fuel under high pressure
DE202011052285U1 (en) Apparatus for mixing abrasive with a stream of air
DE102018207720A1 (en) Apparatus for generating a high pressure fluid jet
DE102016222386A1 (en) Control valve for a fuel injector, fuel injector

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20190527

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20200309

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ROBERT BOSCH GMBH

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502017006753

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1301086

Country of ref document: AT

Kind code of ref document: T

Effective date: 20200915

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20200812

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201112

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201112

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201113

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201212

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502017006753

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201004

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20201031

26N No opposition filed

Effective date: 20210514

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201031

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201031

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201031

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201004

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20211004

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200812

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20211004

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 1301086

Country of ref document: AT

Kind code of ref document: T

Effective date: 20221004

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20221004

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20231023

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20231218

Year of fee payment: 7