EP0110529A2 - Jet abrasif liquide à haute vitesse - Google Patents

Jet abrasif liquide à haute vitesse Download PDF

Info

Publication number
EP0110529A2
EP0110529A2 EP83306212A EP83306212A EP0110529A2 EP 0110529 A2 EP0110529 A2 EP 0110529A2 EP 83306212 A EP83306212 A EP 83306212A EP 83306212 A EP83306212 A EP 83306212A EP 0110529 A2 EP0110529 A2 EP 0110529A2
Authority
EP
European Patent Office
Prior art keywords
jet
particles
nozzle
abrasive
velocity
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
EP83306212A
Other languages
German (de)
English (en)
Other versions
EP0110529B1 (fr
EP0110529A3 (en
Inventor
Mohammed A. Hashish
Yih-Ho Pao
Michael J. Kirby
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.)
Flow Industries Inc
Original Assignee
Flow Industries Inc
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 Flow Industries Inc filed Critical Flow Industries Inc
Priority to AT83306212T priority Critical patent/ATE46846T1/de
Publication of EP0110529A2 publication Critical patent/EP0110529A2/fr
Publication of EP0110529A3 publication Critical patent/EP0110529A3/en
Application granted granted Critical
Publication of EP0110529B1 publication Critical patent/EP0110529B1/fr
Expired legal-status Critical Current

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
    • B24C5/04—Nozzles therefor

Definitions

  • This invention relates to abrasive loaded liquid jets, and particularly to high velocity abrasive liquid cutting jets.
  • abrasive particles It has long been known to accelerate abrasive particles with a jet of high velocity fluid. Such a jet may be used for cleaning and surface finishing applications. Dry and wet sand blasting are examples. In all such applications only the surface of the target material is removed and there is no deep penetration.
  • the fluid used in such applications is usually air or other gas.
  • existing nozzle designs do not allow the particles of abrasive to reach jet speed, or a substantial fraction thereof, resulting in far less than theoretical cutting capacity.
  • existing nozzles do not produce a coherent stream of abrasive- charged particles, resulting in insufficient cutting power and a large kerf.
  • the invention provides a method and apparatus for producing high velocity, abrasive loaded, coherent streams of liquid.
  • the invention maximizes abrasive particle exit velocity and reduces nozzle wear to provide a long service life.
  • the method of the invention first forms a stream of high velocity liquid.
  • the stream is directed through a chamber where abrasive particles of low velocity and random direction are added. Air flow in the chamber directs the particles into the entry of the mixing tube where they randomly impact the high velocity water jet.
  • the result is a mixture of high velocity liquid and particles of abrasive having random direction and velocity.
  • This mixture then continues into a reorientation zone where the particles of abrasive are allowed to orient their direction to that of the liquid.
  • This stream is allowed to continue motion in a nozzle until the particles are accelerated to a velocity approaching that of the liquid.
  • the stream of liquid and rapidly moving particles leave the nozzle.
  • the apparatus of the invention includes a nozzle having zones of curvature and profile necessary to accomplish the method.
  • the entry zone is a converging conical section that may be produced by the action of the particles themselves.
  • a change in outline forms the beginning of the reorientation zone.
  • An accelerator zone follows which may be a straight section.
  • Figure 1 illustrates the first type of nozzle, a converging - diverging or venturi type nozzle. This type of nozzle has been found unsuitable for use in high velocity abrasive water jet cutting due to extreme nozzle erosion problems.
  • a second type of nozzle illustrated in Figure 2 has shown somewhat more promise.
  • This nozzle, called a straight nozzle includes a converging section 1 and a straight section 2 having a length (a) and a diameter (d). The sum of the length of straight section 2 and converging section 1 is the total length (L) of the nozzle. In present nozzles, the ratio of (a)/(d) is less than 20 and is much less for those nozzles where it is between 15.24 and 31.75 mm.
  • FIG. 3 shows a typical arrangement of components used in abrasive water jet cutting.
  • the drawing is broken for clarity.
  • a high pressure water jet nozzle having an orifice 7 of diameter (dn) receives high pressure liquid having a pressure (P) from a source (not shown) of high pressure liquid which may be for example a hydraulic intensifier or equivalent device.
  • a jet 8 emerges from orifice 7 and enters the convergent section 9 of a nozzle 11.
  • Convergent section 9 of nozzle 11 is also connected to a source (not shown) of abrasive particles 10 having a predetermined size (dp) and a flow rate (m).
  • the entrance of jet 8 into converging section 9 of nozzle 11 creates an area of low pressure 12 at the entrance to nozzle 11.
  • the materials used and the geometry of the apparatus must be adapted to the parameters defined above to produce a satisfactory nozzle.
  • FIG. 4 illustrates the characteristics of fluid flow in a high pressure fluid jet nozzle 21.
  • the drawing is broken away for clarity.
  • a jet 22 of high pressure fluid leaves an orifice 23.
  • Typical orifice diameters are from 0.254 to 12.70 mm. with operating pressures from 350 kg cm 2 to 7000 kg cm2 or greater.
  • This is a jet similar to that used in water jet cutting and orifice 23 may be made of for example synthetic sapphire.
  • jet 22 is slightly divergent when it issues from orifice 23.
  • Abrasive particles are introduced into the entry 26 of nozzle 21. The abrasive particles will normally have a random distribution of direction and velocity, but it is desirable to minimize the turbulence and try to direct toward exit point 29.
  • abrasive particles are still moving much slower than jet 22, however, as time is required to transfer momentum from the relatively light liquid to the denser particles of abrasive. Accordingly, a section of nozzle 21 from point 28 to point 29 must be provided. The length of the section between point 28 and 29 must be sufficient so that the velocity of the particles entrained approaches that of jet 22 where point 29 is reached. If nozzle 21 is lengthened beyond point 29, frictional losses will occur resulting in deceleration of abrasive particle velocity and loss of cutting power.
  • Prior nozzle designs have attempted to mix and accelerate the particles with the water in the region between 23 and 26 and have allowed exit of the jet either before axial orientation has occurred or before the abrasive particles have reached the approximate velocity of the liquid jet.
  • jet 22 is in contact with the wall of nozzle 21. Once such contact occurs, jet 22 will assume the flow characteristics of a fluid flowing down a tube at high velocity. The fluid will, accordingly, have a relatively low velocity in that area which is in contact with the wall of nozzle due to formation of a boundary layer. Flow velocity will be much higher as it progresses toward the centre of the diameter of the nozzle. This gradient of velocity will cause the abrasive particles to concentrate at the centre of jet 22.
  • the formation of a boundary layer of relatively low velocity and lowered abrasive particle population allows an extended nozzle life and also can allow the area of nozzle 21 between points 28 and 29 to be made of relatively inexpensive material. Prior designs have allowed the jet to leave the nozzle before concentration of particles in the centre of the jet and have produced high wear rates.
  • nozzle 22 must be sufficiently long for the abrasives to accelerate to at least 80% of the speed of jet 22 and to have a direction nearly parallel to the tube wall in order to provide a coherent and nearly parallel, cohesive, abrasive jet at point 29.
  • the diameter of the section between points 27 and 29 should be sufficiently small so that the abrasive particles are forced to remain in contact with the liquid, but large enough to pass the abrasives and the liquid. Tubes as small as 1.52 mm.
  • the length of nozzle 22 between points 27 and 29 should be between 25 to 100 times its diameter.
  • the diameter of this section should be at least 1.1 times the diameter of the abrasive particles (D ⁇ l.ldp).
  • the diameter of this section should be between 1.1 and 10 times the diameter of orifice 23 (10dj ⁇ d& 1.1dj). This requires, for example, a nozzle length between point 27 and 29 of at least 10 cm. for an orifice 23 of diameter more than or equal to 0.89 mm.
  • a 5 cm., or larger, tube is needed for a 0.51 mm. or larger orifice 23.
  • the length of the nozzle between points 27 and 29 must be at least 12.7 mm.
  • the section of nozzle 21 between points 28 and 29 may be made of the material having a knoop hardness over 1000 which includes carbides, ceramics, and similar materials.
  • the upper section of nozzle 21 between points 26 and 28 should be thick walled so that the abrasive particles can erode the inlet section between points 26 and 27 into a nozzle inlet shape.
  • Figure 5 shows a nozzle incorporating the invention.
  • High pressure liquid enters via a supply tube 31 from a high pressure intensifier (not shown).
  • Supply tube 31 is attached to the nozzle body 32 by means of a gland 33 and collar 34, although any other connector appropriate for the pressures used could be substituted.
  • the high pressure fluid then flows down the interior of nozzle body 32 which is closed at the end opposite supply tube 31 by a jewel holder 36.
  • jewel holder 36 is sealed to nozzle body 32 and includes a recess containing a jewel orifice 37.
  • jewel orifice 37 is constructed of a hard material for example synthetic sapphire having an orifice diameter of 0.025 mm. to 1.27 mm. and is similar to jewels used in high pressure water jet cutting.
  • Nozzle holder 39 includes a threaded attachment point 41 for nozzle body 32 and an introduction port 42 for particles of abrasive.
  • the particles of abrasive flow down a line (not shown) attached to port 42 from a storage tank (not shown).
  • Jet 38 and the abrasive particles then pass through a collar 43 in the interior of nozzle holder 39.
  • Collar 43 prevents erosive wear of nozzle holder 39.
  • the particles of abrasive and jet 38 then enter a tapered sleeve 44 before entering a nozzle 46.
  • Nozzle 46 is constructed of carbide, or other hard material, and is from 51 to 200 mm.
  • Nozzle 46 is attached to a steel adaptor 47 by a compression fitting nut 48 and compression fitting sleeve 49.
  • Adaptor 47 is threadedly connected to nozzle holder 39, although equivalent attachment means could be used.
  • Collar 43, tapered sleeve 44 and the upper portion of nozzle 46 form the mixing chamber of the device.
  • the abrasive loaded stream 50 of liquid finally emerges at the end 51 of nozzle 46 and may be used for cutting such hard materials as steel or glass.
  • FIG. 6 is a block diagram of the method of the invention.
  • a high velocity water jet is generated 61. This may be done much as is presently done in water jet cutting.
  • Abrasive particles are then introduced with the stream 62 into an orienting tube. The particles are then orientated 63 into the direction of the stream.
  • Time is next allowed for acceleration of the particles 64 to a sizeable fraction of stream velocity. The acceleration is accomplished by forcing the stream into an additional length to assume a pipe flow where a boundary layer of fluid having reduced velocity causes concentration of particles in the centre of the jet.
  • the jet charged with particles exits 65 to do work.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Disintegrating Or Milling (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Laser Beam Processing (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
EP83306212A 1982-10-22 1983-10-13 Jet abrasif liquide à haute vitesse Expired EP0110529B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83306212T ATE46846T1 (de) 1982-10-22 1983-10-13 Fluessigkeitsschleuderstrahl mit grosser geschwindigkeit.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US43600282A 1982-10-22 1982-10-22
US436002 1995-05-05

Publications (3)

Publication Number Publication Date
EP0110529A2 true EP0110529A2 (fr) 1984-06-13
EP0110529A3 EP0110529A3 (en) 1985-10-16
EP0110529B1 EP0110529B1 (fr) 1989-10-04

Family

ID=23730692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83306212A Expired EP0110529B1 (fr) 1982-10-22 1983-10-13 Jet abrasif liquide à haute vitesse

Country Status (8)

Country Link
EP (1) EP0110529B1 (fr)
JP (2) JPS59134664A (fr)
AT (1) ATE46846T1 (fr)
AU (1) AU566151B2 (fr)
CA (1) CA1231235A (fr)
DE (1) DE3380663D1 (fr)
NO (1) NO159580C (fr)
ZA (1) ZA837483B (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986006311A1 (fr) * 1985-04-25 1986-11-06 The British Hydromechanics Research Association Courant de fluide abrasif
FR2584641A1 (fr) * 1985-07-12 1987-01-16 Assistance Prestations Dispositif de marquage
EP0317296A2 (fr) * 1987-11-16 1989-05-24 Flow Industries Inc. Dispositif rotatif de grenaillage et procédé
EP0375887A2 (fr) * 1988-12-30 1990-07-04 Gkss-Forschungszentrum Geesthacht Gmbh Méthode et dispositif pour le coupage et le nettoyage d'objets, ainsi que l'enlèvement de matériau par un mélange d'eau et de particules abrasives
US5178496A (en) * 1990-02-27 1993-01-12 Bohler Gesellschaft M.B.H. Method and apparatus for conveying solid particles to abrasive cutting apparatuses
FR2685027A1 (fr) * 1991-12-11 1993-06-18 Diat Christian Procede mecanique de nettoyage de la pollution des pierres de facade.
EP0582191A1 (fr) * 1992-08-03 1994-02-09 Johann Szücs Dispositif et procédé pour le traitement de surfaces sensibles, notamment de sculptures
TR28484A (tr) * 1993-10-27 1996-09-02 Johann Szucs Hassas yüzeylerin,özellikle heykellerin muamele edilmesine mahsus tertibat ve usul.
US5558562A (en) * 1991-12-11 1996-09-24 Diat; Christian Method for micro-cleaning a support and apparatus for implementing same
DE19640921C1 (de) * 1996-10-04 1997-11-27 Saechsische Werkzeug Und Sonde Modularer Abrasivmittelwasserstrahl-Schneidkopf
EP0983823A1 (fr) * 1997-02-04 2000-03-08 Jet Edge, a Division of TC/American Monorail, Inc. Tête de coupe pour ensemble de découpe au jet d'eau
FR2783735A1 (fr) * 1998-09-29 2000-03-31 Patrick Loubeyre Dispositif pour la decontamination des surfaces au moyen d'un jet compose d'air, d'une matiere de projection a grains fins et d'un liquide
CN102672625A (zh) * 2011-03-17 2012-09-19 新东工业株式会社 喷丸加工用喷嘴以及具备该喷嘴的喷丸加工装置
US10427752B2 (en) 2016-05-23 2019-10-01 Shimano Inc. Bicycle operating device
CN114033413A (zh) * 2021-11-09 2022-02-11 中铁工程装备集团有限公司 一种超声波辅助的高压水射流混合磨料喷头和掘进机

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4817874A (en) * 1985-10-31 1989-04-04 Flow Systems, Inc. Nozzle attachment for abrasive fluid-jet cutting systems
JPS6350699U (fr) * 1986-09-18 1988-04-06
KR930008692B1 (ko) * 1986-02-20 1993-09-13 가와사끼 쥬고교 가부시기가이샤 어브레시브 워터 제트 절단방법 및 장치
JPS6339243A (ja) * 1986-08-04 1988-02-19 Canon Inc 通信装置
JPH0613840Y2 (ja) * 1988-02-09 1994-04-13 株式会社スギノマシン アブレーシブ供給装置
US7067031B2 (en) 2003-12-03 2006-06-27 Dew Engineering And Development Limited Process for making a ceramic armor plate
US9587298B2 (en) 2013-02-19 2017-03-07 Arconic Inc. Heat treatable aluminum alloys having magnesium and zinc and methods for producing the same

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE494888C (de) * 1928-08-31 1930-03-29 Alfred Gutmann A G Fuer Maschb Ringspaltduese fuer Sandstrahlgeblaese
US2176577A (en) * 1937-04-03 1939-10-17 Hydroblast Corp Sandblast device
FR1203550A (fr) * 1958-03-03 1960-01-19 Inst Rech S De La Sid Erurgie Dispositif pour communiquer des vitesses élevées à des particules en suspension dans un gaz
CH400811A (fr) * 1963-06-17 1965-10-15 Carpenter Leandre Pistolet de sablage
DE1477991A1 (de) * 1965-05-31 1969-07-17 Elektro Veb Vorrichtung zum Strahllaeppen
US3994097A (en) * 1975-04-07 1976-11-30 Lamb Ralph W Abrasive or sand blast apparatus and method
FR2348751A1 (fr) * 1976-04-20 1977-11-18 Inst Tsementnoi Promy Injecteur pour appareils a jet
FR2369008A1 (fr) * 1976-10-26 1978-05-26 Myers Europ Gmbh Projecteur plat pour un melange d'un liquide sous pression et de particules solides
DE2724318A1 (de) * 1977-05-28 1978-11-30 Peiniger Ernst Gmbh Verfahren und anlage zum druckluftstrahlen
DE2928698A1 (de) * 1979-07-16 1981-02-19 Nat Res Dev Vorrichtung zur erzeugung eines mit schleifmittelteilchen versetzten fluessigkeitsstrahles (dispenser)
EP0069875A2 (fr) * 1981-07-09 1983-01-19 Ernst Peiniger GmbH Unternehmen für Bautenschutz Procédé de grenaillage au moyen d'air sous pression et dispositif pour sa mise en oeuvre
EP0090691B1 (fr) * 1982-03-15 1987-11-04 Commissariat A L'energie Atomique Buse de sablage à jet plat et contenant des particules solides abrasives

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5077987A (fr) * 1973-11-13 1975-06-25

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE494888C (de) * 1928-08-31 1930-03-29 Alfred Gutmann A G Fuer Maschb Ringspaltduese fuer Sandstrahlgeblaese
US2176577A (en) * 1937-04-03 1939-10-17 Hydroblast Corp Sandblast device
FR1203550A (fr) * 1958-03-03 1960-01-19 Inst Rech S De La Sid Erurgie Dispositif pour communiquer des vitesses élevées à des particules en suspension dans un gaz
CH400811A (fr) * 1963-06-17 1965-10-15 Carpenter Leandre Pistolet de sablage
DE1477991A1 (de) * 1965-05-31 1969-07-17 Elektro Veb Vorrichtung zum Strahllaeppen
US3994097A (en) * 1975-04-07 1976-11-30 Lamb Ralph W Abrasive or sand blast apparatus and method
FR2348751A1 (fr) * 1976-04-20 1977-11-18 Inst Tsementnoi Promy Injecteur pour appareils a jet
FR2369008A1 (fr) * 1976-10-26 1978-05-26 Myers Europ Gmbh Projecteur plat pour un melange d'un liquide sous pression et de particules solides
DE2724318A1 (de) * 1977-05-28 1978-11-30 Peiniger Ernst Gmbh Verfahren und anlage zum druckluftstrahlen
DE2928698A1 (de) * 1979-07-16 1981-02-19 Nat Res Dev Vorrichtung zur erzeugung eines mit schleifmittelteilchen versetzten fluessigkeitsstrahles (dispenser)
EP0069875A2 (fr) * 1981-07-09 1983-01-19 Ernst Peiniger GmbH Unternehmen für Bautenschutz Procédé de grenaillage au moyen d'air sous pression et dispositif pour sa mise en oeuvre
EP0090691B1 (fr) * 1982-03-15 1987-11-04 Commissariat A L'energie Atomique Buse de sablage à jet plat et contenant des particules solides abrasives

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986006311A1 (fr) * 1985-04-25 1986-11-06 The British Hydromechanics Research Association Courant de fluide abrasif
US4878785A (en) * 1985-04-25 1989-11-07 The British Hydromechanics Research Association Abrasive fluid flow
FR2584641A1 (fr) * 1985-07-12 1987-01-16 Assistance Prestations Dispositif de marquage
EP0317296A2 (fr) * 1987-11-16 1989-05-24 Flow Industries Inc. Dispositif rotatif de grenaillage et procédé
EP0317296A3 (fr) * 1987-11-16 1990-03-07 Flow Industries Inc. Dispositif rotatif de grenaillage et procédé
EP0375887A2 (fr) * 1988-12-30 1990-07-04 Gkss-Forschungszentrum Geesthacht Gmbh Méthode et dispositif pour le coupage et le nettoyage d'objets, ainsi que l'enlèvement de matériau par un mélange d'eau et de particules abrasives
EP0375887A3 (fr) * 1988-12-30 1991-04-03 Gkss-Forschungszentrum Geesthacht Gmbh Méthode et dispositif pour le coupage et le nettoyage d'objets, ainsi que l'enlèvement de matériau par un mélange d'eau et de particules abrasives
US5178496A (en) * 1990-02-27 1993-01-12 Bohler Gesellschaft M.B.H. Method and apparatus for conveying solid particles to abrasive cutting apparatuses
FR2685027A1 (fr) * 1991-12-11 1993-06-18 Diat Christian Procede mecanique de nettoyage de la pollution des pierres de facade.
US5558562A (en) * 1991-12-11 1996-09-24 Diat; Christian Method for micro-cleaning a support and apparatus for implementing same
US5462605A (en) * 1992-08-03 1995-10-31 Szuecs; Johann Apparatus and method for treating sensitive surface, in particular of sculpture
EP0582191A1 (fr) * 1992-08-03 1994-02-09 Johann Szücs Dispositif et procédé pour le traitement de surfaces sensibles, notamment de sculptures
TR28484A (tr) * 1993-10-27 1996-09-02 Johann Szucs Hassas yüzeylerin,özellikle heykellerin muamele edilmesine mahsus tertibat ve usul.
DE19640921C1 (de) * 1996-10-04 1997-11-27 Saechsische Werkzeug Und Sonde Modularer Abrasivmittelwasserstrahl-Schneidkopf
US6012653A (en) * 1996-10-04 2000-01-11 Sachsische Werkzeug Und Sondermaschinen Modular abrasive medium water jet cutting head
EP0983823A1 (fr) * 1997-02-04 2000-03-08 Jet Edge, a Division of TC/American Monorail, Inc. Tête de coupe pour ensemble de découpe au jet d'eau
FR2783735A1 (fr) * 1998-09-29 2000-03-31 Patrick Loubeyre Dispositif pour la decontamination des surfaces au moyen d'un jet compose d'air, d'une matiere de projection a grains fins et d'un liquide
EP0990487A1 (fr) * 1998-09-29 2000-04-05 Patrick Loubeyre Dispositif pour la décontamination des surfaces au moyen d'un jet composé d'air, d'une matière de projection à grains fins et d'un liquide
US6390899B1 (en) 1998-09-29 2002-05-21 Patrick Loubeyre Device for decontamination of surfaces
CN102672625A (zh) * 2011-03-17 2012-09-19 新东工业株式会社 喷丸加工用喷嘴以及具备该喷嘴的喷丸加工装置
CN102672625B (zh) * 2011-03-17 2016-12-14 新东工业株式会社 喷丸加工用喷嘴以及具备该喷嘴的喷丸加工装置
US10427752B2 (en) 2016-05-23 2019-10-01 Shimano Inc. Bicycle operating device
CN114033413A (zh) * 2021-11-09 2022-02-11 中铁工程装备集团有限公司 一种超声波辅助的高压水射流混合磨料喷头和掘进机

Also Published As

Publication number Publication date
DE3380663D1 (en) 1989-11-09
NO159580C (no) 1989-01-18
EP0110529B1 (fr) 1989-10-04
AU566151B2 (en) 1987-10-08
ZA837483B (en) 1984-11-28
NO159580B (no) 1988-10-10
EP0110529A3 (en) 1985-10-16
CA1231235A (fr) 1988-01-12
NO833847L (no) 1984-04-24
JPH0344452Y2 (fr) 1991-09-18
JPH01114267U (fr) 1989-08-01
ATE46846T1 (de) 1989-10-15
JPS59134664A (ja) 1984-08-02
AU1997883A (en) 1984-05-03

Similar Documents

Publication Publication Date Title
US4648215A (en) Method and apparatus for forming a high velocity liquid abrasive jet
EP0110529A2 (fr) Jet abrasif liquide à haute vitesse
AU2008288702B2 (en) A control system for a fluid/abrasive jet cutting arrangement
HU194514B (en) Method and apparatus for cleaning stone and metal surfaces
OA11309A (en) Method and apparatus for producing a high-velocityparticle stream.
US20130324013A1 (en) Fluid/Abrasive Jet Cutting Arrangement
US4922664A (en) Liquid sand blast nozzle and method of using same
JPH0647671A (ja) キヤビテーシヨン噴流用ノズル
RU2055652C1 (ru) Гидробародинамический способ очистки внутренней поверхности трубопроводов
CA1199799A (fr) Production d'un melange haute pression de fluide et d'abrasif, et buse de concentration du jet pour le percage et le decoupage de materiaux massifs
JPH054199A (ja) 切削・切断方法とその装置
JPS63144961A (ja) 管内面ブラスト装置
EA041913B1 (ru) Абразивная головка с вложенной форсункой
RU2307938C1 (ru) Способ формирования струи жидкости и устройство для его осуществления
SU1077621A1 (ru) Устройство смешени газа с жидкостью
RU2223167C2 (ru) Способ гидрогазоабразивной обработки и устройство для абразивной обработки поверхности
EP0153942A1 (fr) Appareil de coupe du beton

Legal Events

Date Code Title Description
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

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19860128

17Q First examination report despatched

Effective date: 19860930

R17C First examination report despatched (corrected)

Effective date: 19870519

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 46846

Country of ref document: AT

Date of ref document: 19891015

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3380663

Country of ref document: DE

Date of ref document: 19891109

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: UFFICIO BREVETTI RICCARDI & C.

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

26N No opposition filed
ITTA It: last paid annual fee
REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EAL Se: european patent in force in sweden

Ref document number: 83306212.8

REG Reference to a national code

Ref country code: FR

Ref legal event code: RN

REG Reference to a national code

Ref country code: FR

Ref legal event code: D3

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

Ref country code: FR

Payment date: 19970910

Year of fee payment: 15

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

Ref country code: AT

Payment date: 19970916

Year of fee payment: 15

Ref country code: BE

Payment date: 19970916

Year of fee payment: 15

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

Ref country code: GB

Payment date: 19970918

Year of fee payment: 15

Ref country code: SE

Payment date: 19970918

Year of fee payment: 15

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

Ref country code: DE

Payment date: 19970922

Year of fee payment: 15

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

Ref country code: NL

Payment date: 19970923

Year of fee payment: 15

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

Ref country code: CH

Payment date: 19971002

Year of fee payment: 15

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: 19981013

Ref country code: GB

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

Effective date: 19981013

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

Ref country code: SE

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

Effective date: 19981014

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: 19981031

Ref country code: CH

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

Effective date: 19981031

Ref country code: LI

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

Effective date: 19981031

BERE Be: lapsed

Owner name: FLOW INDUSTRIES INC.

Effective date: 19981031

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

Ref country code: NL

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

Effective date: 19990501

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

Effective date: 19981013

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EUG Se: european patent has lapsed

Ref document number: 83306212.8

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

Ref country code: FR

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

Effective date: 19990630

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19990501

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

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

Ref country code: DE

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

Effective date: 19990803