WO1999003640A1 - Dispositif de coupe par abrasion a deux phases - Google Patents

Dispositif de coupe par abrasion a deux phases Download PDF

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Publication number
WO1999003640A1
WO1999003640A1 PCT/GB1998/002060 GB9802060W WO9903640A1 WO 1999003640 A1 WO1999003640 A1 WO 1999003640A1 GB 9802060 W GB9802060 W GB 9802060W WO 9903640 A1 WO9903640 A1 WO 9903640A1
Authority
WO
WIPO (PCT)
Prior art keywords
jet
fluid
cutting device
cooled
pressurised
Prior art date
Application number
PCT/GB1998/002060
Other languages
English (en)
Inventor
Graham Richard Taylor
Original Assignee
The Secretary Of State For Defence
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 The Secretary Of State For Defence filed Critical The Secretary Of State For Defence
Publication of WO1999003640A1 publication Critical patent/WO1999003640A1/fr

Links

Classifications

    • 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
    • B24C1/003—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods using material which dissolves or changes phase after the treatment, e.g. ice, CO2
    • 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

Definitions

  • the present invention relates to liquid abrasive cutting techniques which are used to cut difficult, friction or static sensitive materials such as explosives.
  • liquid abrasive cutting techniques are carried out by- pressurising a liquid to a high pressure, typically 2000 Bar and generating a fine high pressure jet which is able to cut a range of target materials.
  • a high pressure typically 2000 Bar
  • the liquid jet alone is sufficient to produce a cut.
  • an abrasive material is introduced into the liquid jet.
  • a disadvantage of known liquid abrasive cutting techniques is the potential for the abrasive material to come into contact with and become embedded within any highly explosive material present, thereby increasing its explosive sensitivity.
  • the present invention provides a two phase cutting device having a cutting element comprising a cooled pressurised fluid jet with solid abrasive particles entrained therein, wherein the abrasive particles are formed from a material which is fluid at normal ambient conditions but which is solid at the conditions within the fluid jet.
  • An advantage of the invention over known liquid abrasive cutting systems arises from the fact that the abrasive particles are solid whilst entrained within the cutting jet but become fluid (i.e. either a liquid or a gas) at normal ambient conditions. Therefore, once the cutting operation is completed any abrasive particles in contact with the explosive material will melt or sublime as the temperature and pressure of the particles returns to normal ambient conditions. Thus, the abrasive particles will not remain embedded in the explosive material and will not be explosive sensitising. The two phase cutting system will effectively leave only innocuous residues or, in some cases, no residues at all on the material being cut.
  • the equipment for generating such a two phase jet can be similar to conventional systems but with additional mechanisms to generate the solid abrasive particles within the environment of the jet.
  • the solid abrasive particles may be formed post pressurisation and therefore the pumping system or other pressure intensifier is only exposed to fluids, minimising mechanical wear.
  • a further advantage of the invention over known liquid abrasive cutting systems is the reduction of wear in the mechanical components of the system.
  • a liquid with a low freezing point is chosen as a carrier fluid.
  • a second liquid with a much higher freezing point but which is liquid at ambient conditions is introduced into the carrier fluid to produce the solid abrasive particles within the jet.
  • the abrasive solid particles can be generated by introducing water into the carrier fluid.
  • the water can be pre- cooled to near freezing point before being fed into the carrier fluid.
  • a reservoir tank of silicone oil is cooled to -40°c using either conventional refrigeration equipment or compressed carbon dioxide released from a cylinder.
  • the cooled silicone oil is then pressurised through a conventional pressure intensification system, with optional further cooling post pressurisation.
  • the cold pressurised oil is fed to the jet nozzle where pre-cooled water is injected to form ice crystals within the liquid jet.
  • the injection of cooled water into the oil stream may be achieved using known systems for the injection of abrasive slurries into high pressure jets by utilising a proportion of the pressurised flow.
  • An advantage of the use of water rather than an abrasive slurry is that injection is easier to control as there are none of the attendant clogging problems associated with suspended particulates.
  • the vessel containing the water in this type of injection system should be rated at the jet operating pressure including adequate safety factors.
  • a silicone oil/water emulsion is generated within the reservoir tank.
  • the emulsion may be generated using a high shear rate, high energy mixer, possibly with the addition of suitable emulsifying agents.
  • This emulsion is pressurised though a conventional pressure intensification system and cooled at the jet orifice using a high capacity cooling system, possibly based on liquid nitrogen or carbon dioxide.
  • the two phase cutting jet can also be generated using a single material in two phases, for example water and ice.
  • the temperature of the jet will have to be accurately controlled to ensure that the two phases of the material can coexist within the cutting jet.
  • the carrier fluid could be provided by a gas which is cooled sufficiently to solidify the abrasive particle material to provide solid abrasive particles entrained within the gas.
  • This arrangement would operate upon similar principles to grit -blasting but with the "grit” being provided by ice crystals or some other solid particles which are fluid (either liquid or gas) at ambient conditions.
  • Certain gases can exist as liquids at pressures suitable for liquid jet cutting and at temperatures below 0°c.
  • pressurised cold liquid carbon dioxide (or a gas with similar properties) may be used as a carrier fluid and water may be injected at the jet nozzle to produce a liquid carbon dioxide/ice jet.
  • the temperature of the pressurised jet preferably falls in the range - 0°c to -50°c, typically -40 °c. Due to the high capital funding of very high pressure systems, the operating pressure of the jet will preferably fall within the range 200 bar to 2500 bar, typically 2000 bar.
  • Fig 1 Shows a schematic of a two phase cutter in which pre-cooled water is injected into the jet carrier fluid at the jet nozzle.
  • Fig 2. Shows a schematic of a two phase cutter in which water and the jet carrier fluid are mixed to form an emulsion which is pressurised and then cooled at the jet nozzle.
  • a reservoir tank 1 is filled with a light silicone oil 2 which is cooled to -40°c.
  • the light silicone oil 2 (which acts as the carrier fluid) is then pressurised using a pumping system 3 and fed to an outlet nozzle 4.
  • a pumping system 3 At the outlet nozzle, pre- cooled water is mixed with the silicone oil 2 and forms ice crystals which are entrained within the silicone oil, to form the cutting jet 5.
  • a reservoir tank 1 is filled with a mixture of light silicone oil and water 2 which is mixed with a mixer 6 to form an emulsion.
  • This emulsion is then pressurised using a pumping system 3 and fed to an outlet nozzle 4.
  • the emulsion is ejected from the outlet nozzle 4, it is rapidly cooled using liquid nitrogen or carbon dioxide, thereby forming ice crystals within the jet of silicone oil, to form the cutting jet 5.
  • the two-phase jet can be provided by a number of different combinations of materials, provided the carrier fluid is a liquid or gas at the pressure and temperature conditions in the pressurised jet and the abrasive particle material is a solid at the conditions in the pressurised jet and a liquid or gas at ambient conditions.

Landscapes

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

Abstract

L'invention concerne un dispositif de coupe par abrasion au fluide à deux phases, ayant un élément de coupe constitué d'un jet de fluide refroidi sous pression dans lequel sont entraînées des particules abrasives : ces particules sont en matériau lui-même liquide dans des conditions ambiantes normales, mais solide dans les conditions propres au jet de fluide. Le dispositif en question peut être utilisé pour la découpe de matériaux explosifs car il n'induit aucune sensibilisation des matières explosives.
PCT/GB1998/002060 1997-07-18 1998-07-13 Dispositif de coupe par abrasion a deux phases WO1999003640A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9715014.8 1997-07-18
GB9715014A GB9715014D0 (en) 1997-07-18 1997-07-18 Two phase cutting device

Publications (1)

Publication Number Publication Date
WO1999003640A1 true WO1999003640A1 (fr) 1999-01-28

Family

ID=10815972

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/002060 WO1999003640A1 (fr) 1997-07-18 1998-07-13 Dispositif de coupe par abrasion a deux phases

Country Status (2)

Country Link
GB (1) GB9715014D0 (fr)
WO (1) WO1999003640A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2008770A1 (fr) 2007-06-27 2008-12-31 Linde AG Dispositif et procédé de nettoyage de moules par glace carbonique

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2042399A (en) * 1979-01-15 1980-09-24 Boc Ltd Method and apparatus for penetrating a body of material or treating a surface
FR2674165A1 (fr) * 1991-03-19 1992-09-25 Thonney Sa Procede et machine d'ebavurage de pieces dans un tambour rotatif.
DE4128703A1 (de) * 1991-08-29 1993-03-04 Dietmar Dr Ing Rath Verfahren und vorrichtung zum universellen entschaerfen von munition und sprengstoffen aller art und in allen bereichen
DE4221666C1 (de) * 1992-07-02 1994-01-27 Alba Ind & Umweltschutzservice Verfahren zum Öffnen von explosivstoffhaltigen Körpern
US5380356A (en) * 1991-09-07 1995-01-10 Bego Bremer Goldschlagerei Wilh. Herbst Gmbh & Co. Quartz-free powdered magmatic nepheline rock material for the surface treatment of dental parts, especially grinding, polishing and/or blasting material
DE4418845C1 (de) * 1994-05-30 1995-09-28 Bernold Richerzhagen Verfahren und Vorrichtung zur Materialbearbeitung mit Hilfe eines Laserstrahls
DE4440208A1 (de) * 1994-11-10 1996-05-15 Alba Ind & Umweltschutzservice Verfahren und Vorrichtung zum Zerschneiden eines Körpers aus festen Explosivstoffen, insbesondere Composite-Raketentreibstoffen
DE19601814A1 (de) * 1995-06-06 1996-12-12 Kipp Jens Werner Verfahren zum Reinigen von Oberflächen mit Hilfe eines Strahlmittels und Roboter zur Durchführung des Verfahrens

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2042399A (en) * 1979-01-15 1980-09-24 Boc Ltd Method and apparatus for penetrating a body of material or treating a surface
FR2674165A1 (fr) * 1991-03-19 1992-09-25 Thonney Sa Procede et machine d'ebavurage de pieces dans un tambour rotatif.
DE4128703A1 (de) * 1991-08-29 1993-03-04 Dietmar Dr Ing Rath Verfahren und vorrichtung zum universellen entschaerfen von munition und sprengstoffen aller art und in allen bereichen
US5380356A (en) * 1991-09-07 1995-01-10 Bego Bremer Goldschlagerei Wilh. Herbst Gmbh & Co. Quartz-free powdered magmatic nepheline rock material for the surface treatment of dental parts, especially grinding, polishing and/or blasting material
DE4221666C1 (de) * 1992-07-02 1994-01-27 Alba Ind & Umweltschutzservice Verfahren zum Öffnen von explosivstoffhaltigen Körpern
DE4418845C1 (de) * 1994-05-30 1995-09-28 Bernold Richerzhagen Verfahren und Vorrichtung zur Materialbearbeitung mit Hilfe eines Laserstrahls
DE4440208A1 (de) * 1994-11-10 1996-05-15 Alba Ind & Umweltschutzservice Verfahren und Vorrichtung zum Zerschneiden eines Körpers aus festen Explosivstoffen, insbesondere Composite-Raketentreibstoffen
DE19601814A1 (de) * 1995-06-06 1996-12-12 Kipp Jens Werner Verfahren zum Reinigen von Oberflächen mit Hilfe eines Strahlmittels und Roboter zur Durchführung des Verfahrens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2008770A1 (fr) 2007-06-27 2008-12-31 Linde AG Dispositif et procédé de nettoyage de moules par glace carbonique

Also Published As

Publication number Publication date
GB9715014D0 (en) 1997-09-24

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