WO2002085573A1 - Systeme a jet de fluide abrasif - Google Patents

Systeme a jet de fluide abrasif Download PDF

Info

Publication number
WO2002085573A1
WO2002085573A1 PCT/SG2002/000065 SG0200065W WO02085573A1 WO 2002085573 A1 WO2002085573 A1 WO 2002085573A1 SG 0200065 W SG0200065 W SG 0200065W WO 02085573 A1 WO02085573 A1 WO 02085573A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
conduit
pressure
abrasive
slurry
Prior art date
Application number
PCT/SG2002/000065
Other languages
English (en)
Inventor
Michael William Gadd
Original Assignee
Jetsis International Pte Ltd
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 Jetsis International Pte Ltd filed Critical Jetsis International Pte Ltd
Priority to US10/475,692 priority Critical patent/US20040198179A1/en
Priority to EP02723037A priority patent/EP1389153B1/fr
Priority to KR1020037013766A priority patent/KR100565549B1/ko
Priority to JP2002583135A priority patent/JP4047175B2/ja
Priority to CA2444951A priority patent/CA2444951C/fr
Priority to DE60212119T priority patent/DE60212119T2/de
Priority to AT02723037T priority patent/ATE306363T1/de
Publication of WO2002085573A1 publication Critical patent/WO2002085573A1/fr

Links

Classifications

    • 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
    • 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 present invention relates to an abrasive fluid jet cutting system and in particular although not solely to a system for supplying a pressurised slurry from a pressurised abrasive slurry containing vessel to an abrasive-jet nozzle(s) to enable cutting or other abrasive-fluid jet machining operations to be carried out.
  • Abrasive fluid jet systems in the art are used in many applications where precision- cutting is required.
  • An example of such an application is the singulation of substrates.
  • One type of abrasive jet system utilizes abrasive that is stored and discharged under pressure from a pressure vessel to mix with the driving fluid immediately before the nozzle to form an abrasive slurry. Such mixing is achieved by a venturi effect. The slurry is normally then accelerated through a nozzle to form an abrasive fluid jet tool for cutting substrates.
  • Such existing systems require the separate and independent delivery of abrasive for each of the nozzles where a multi-nozzle cutting head is to be provided.
  • Such independent delivery requires independent control and increases the chances of one or more nozzles of the multi-nozzle cutting head operating in a less than ideal condition.
  • WO 95/29792 An alternative configuration of mixing an abrasive with a fluid is for example shown in WO 95/29792.
  • a pressure vessel is provided within which an abrasive and a fluid under pressure are able to mix prior to being delivered via a conduit to the nozzle.
  • liquid compressibility becomes an important factor.
  • Such undesired discharge may for example occur if the slurry containment pressure vessel pressurising pump fails. Since the slurry in the pressure vessel is under high pressure and is compressed by the pump, upon failure of the pump the compressed slurry will expand and continue, for at least for a short period, to deliver the slurry through the delivery pipe to continue to discharge an abrasive slurry from the nozzle.
  • the present invention consists in an abrasive fluid jet system comprising:
  • a vessel including a layer of abrasive slurry and a top layer comprising substantially of fluid over the layer of abrasive slurry;
  • the fluid valve is closed once the system is pressurised to displace abrasive slurry through the discharge conduit and the fluid valve is open upon de-pressurization of the system to allow fluid flow from the first conduit to the second conduit and to stop discharge of the abrasive slurry.
  • the fluid valve is open to allow water flow through the second conduit to pressurise the system and the fluid valve is closed for operation of the fluid jet system once the vessel is sufficiently pressurised.
  • the high-pressure fluid supply means feeds fluid to the discharge conduit through a third conduit to produce a mixture of fluid together with the abrasive slurry for ejection through an ejection means, provided at the end of the discharge conduit.
  • a second fluid valve provided in the first conduit is to control the flow of fluid from the high-pressure fluid supply means to the vessel.
  • it includes a hopper providing a supply of abrasive slurry to the vessel, and a pump for drawing fluid from the top layer of fluid in the vessel, wherein the resulting pressure caused by pumping fluid from the vessel draws abrasive slurry from the hopper into the vessel.
  • the present invention consists in an abrasive slurry pressurising system comprising a pressure vessel defining a compartment within which there can be maintained an abrasive slurry volume and a fluid substantially absent of abrasive material volume above said abrasive slurry volume a supply of abrasive mixture connectable to the compartment a delivery conduit to deliver fluid under pressure to said compartment via a first opening of said pressure vessel defined by said delivery conduit a slurry uptake and delivery conduit to deliver the slurry contents of compartment of said pressure vessel via a second opening of said pressure vessel defined by said slurry uptake and delivery conduit to a nozzle under the driving influence of the fluid under pressure entering said compartment via said first opening a pressure control conduit in fluid connection with said fluid substantially absent of abrasive said pressure control conduit including a fluid flow control valve to regulate the pressure within said compartment.
  • said pressure control conduit is in fluid connection with said compartment via a third opening of said compartment, said third opening provided by said pressure control conduit and located to
  • said delivery conduit extends into said compartment to position said first opening to be within said abrasive slurry.
  • said pressure control conduit is in fluid connection with said compartment via said first opening, said first opening located to be within said fluid substantially absent from said abrasive.
  • said pressure control conduit is also in fluid connection with said slurry uptake and delivery conduit remote from said compartment to, when said fluid flow control valve is in a non closed condition, relieve pressure within said compartment via said nozzle.
  • said pressure control conduit includes an exhaust outlet remote from said compartment to, when said fluid flow control valve is in a non closed condition, relieve pressure within said compartment via exhaust outlet.
  • said fluid flow control valve is responsive to delivery conduit fluid pressure and if such is below a specified pressure corresponding to being below a desirable system operating pressure, said valve will be in a non closed condition.
  • fluid comprises predominantly of water.
  • said slurry comprises of a an abrasive material entrained within said fluid.
  • the present invention consists in a method of operating a system as herein before described comprising; to said compartment containing said abrasive slurry and said fluid substantially absent from abrasive material above said abrasive slurry, delivery fluid under pressure via said delivery conduit, whilst allowing pressure relief from said compartment to occur via said pressure relief conduit by said fluid flow control valve being in a non closed condition when a sufficient pressure is reached within said compartment to allow the nozzle to operate in a desired material cutting mode, closing said fluid flow control valve to then urge said pressure relief of said compartment to occur by the delivery of slurry via said slurry uptake and delivery conduit to said nozzle.
  • the present invention consist in method of operating a system as herein before described comprising; for a compartment containing said abrasive slurry and said fluid substantially absent from abrasive material above said abrasive slurry, and operating under pressure from fluid delivered via delivery conduit to thereby displace slurry from said compartment via said slurry uptake and delivery conduit to said nozzle moving said fluid flow control valve to a non closed condition thereby preventing said displacement of slurry as the pressure within said compartment falls below a pressure to allow the displacement of said slurry via said slurry uptake and delivery conduit.
  • the present invention consist in a method of controlling a system as herein before described comprising; for a compartment containing said abrasive slurry and said fluid substantially absent from abrasive material above said abrasive slurry, and operating under pressure from fluid delivered via delivery conduit to thereby displace slurry from said compartment via said slurry uptake and delivery conduit to said nozzle preventing said displacement of slurry if pressure within said compartment falls below a pressure to allow the nozzle to operate in a desired material cutting mode, by moving said fluid flow control valve to a non closed condition, conduit to the second conduit and to stop discharge of the abrasive slurry.
  • an abrasive fluid jet system comprising: a) a vessel having a compartment for carrying (a) a volume of abrasive slurry above which there is provided (b) a volume comprising of fluid substantially absent of abrasive slurry; b) a high-pressure fluid supply means to supply fluid to said vessel; c) a discharge conduit including an inlet opening to locate within said volume of abrasive slurry and a nozzle d) a delivery conduit leading from the fluid supply means into said vessel to under as high-pressure fluid feed therethrough and into the vessel to induce flow of abrasive slurry into and through said discharge conduit to said nozzle; e) a pressure relief conduit in fluid connection with said vessel to operatively connect between the volume comprising substantially of fluid and said discharge conduit, said pressure relief conduit including a fluid valve which controls the fluid flow therethrough wherein the fluid valve in an opened condition induces relief of pressure from said vessel by establishing a flow alternative to said flow of
  • Figure 1 is a system diagram illustrating a first embodiment of the invention.
  • Figure 2 is a system diagram illustrating a second embodiment of the invention.
  • Figure 3 is a system diagram illustrating a third embodiment of the invention.
  • Figure 4 is a system diagram illustrating a fourth embodiment of the invention.
  • the present invention relies on the natural tendency for fluid to take the path of least resistance to enable compressed fluid volume to be released into a discharge conduit with the design being such that the discharge is absent of abrasive.
  • a pressure vessel 11 which provides a compartment for retaining an abrasive slurry.
  • An abrasive slurry is a mixture of an abrasive material which is entrained within a fluid such as for example water or a liquid composition containing water.
  • the vessel 11 contains the abrasive slurry 2 above which a layer of liquid 4 is provided.
  • This liquid 4 is the same liquid used to entrain the abrasive particles to provide the slurry but which above a certain level "L" in the vessel is not mixed with abrasive.
  • a source of pressurised fluid 10 which incorporates a pressurising pump feeds fluid to the vessel 11.
  • Feeding of fluid from the source 10 is through delivery conduits 14 and 15.
  • Conduit 15 is provided to deliver fluid to the uptake and delivery conduit to thereby provide the appropriate dilution to the slurry being displaced through the opening 30. This dilution may be necessary to avoid blockage of the uptake and delivery conduit.
  • Conduit 14 is the main delivery and vessel pressurising conduit.
  • the conduit 14 has its outlet opening 24, defining a first opening in the vessel 11 within the fluid only region of the pressure vessel (ie above L)
  • a hopper 17 feeds abrasive slurry 2 to the vessel 11 through conduit 19.
  • a pressure relief conduit 21 is provided to be in fluid communication with the volume in vessel and be in flow contact with the fluid absent of abrasive. In the configuration of figure 1 , the flow contact is provided via part of said delivery conduit 14.
  • a fluid valve 13 controls the flow of fluid across pressure control conduit 21.
  • the pump system delivers pressurised fluid to the vessel and this causes the displacement of abrasive slurry 2 via the inlet opening 30 of the slurry uptake and delivery conduit 16 to nozzle 12.
  • the inlet opening is positioned below L and preferably near the bottom of the vessel 11.
  • the pressure relief conduit 21 can be considered a by pass conduit to by pass the flow of volume of the vessel which contains abrasive.
  • the control of the bypass achieved by a fluid flow control valve which is closable to close the conduit 21.
  • the conduit 14 is connected to the top of the vessel 11 where there is no abrasive 2 present.
  • the fluid valve 13 connecting conduit 21 to the delivery conduit outside of the vessel is opened.
  • the volume of the content inside the vessel 11 will remain compressed but will wish to expand.
  • Two openings are available but such expansion will have a preference to discharge through conduit 21 , instead of through the opening 30 of the delivery conduit 16. This is because expansion of the volume by displacement of slurry flow through the opening 30 of the conduit 16 whose internal diameter, length and most predominantly because of the density and viscosity of the slurry bed 2 leads to a higher flow resistances.
  • fluid valve 13 On start-up and pressurisation of the system, fluid valve 13 will initially be open. The fluid will flow from source 10 into the vessel 11 through conduit 14. With fluid valve 13 open some of the fluid flow will enter conduit 21. Pressurisation of the vessel will also occur but this is reduced because of the partial flow diversion.
  • the pressure relief conduit is connected to the slurry uptake and delivery conduit upstream of the second opening 30 (and preferably outside of said vessel) the combination of resistance of slurry flow up through the opening 30 and the fact that the flow of fluid through the conduit 21 and into the uptake and delivery conduit creates a back pressure in that part of the uptake and delivery conduit towards the opening 30, no slurry will travel to the nozzle.
  • Upon closing of the valve 13 there will then be sufficient mass flow into the slurry pressure vessel 11 to cause a displacement of abrasive into the inlet opening 30 of conduit 16.
  • valve 13 With valve 13 closed, the fluid flow from source 10 enters the vessel 11. through conduit 14 thus causing displacement of abrasive slurry into the inlet opening 30 of the uptake and delivery conduit 16 where it mixes with the main flow from conduit 15 and is carried to the nozzle through the uptake and delivery conduit 16 to the nozzle 12. Abrasive flow can also at any time be halted by opening valve 13. On depressurisation, fluid valve 13 is open to provide an alternative and preferred route through conduit 21 for the compressed fluid. Upon expansion of the contents in the vessel such expansion is via the relief conduit 21.
  • conduit 14 has its opening in the vessel above level L, which ensures that the abrasive slurry is able to reach fluid valve 13 and it hence normally operates on clean water and with a minimal pressure differential hence its service life-time will be generally higher than would otherwise be the case.
  • the inner diameter of conduit 21 should be sufficiently large to ensure that the velocity of the escaping fluid is well below the settling velocity of the abrasive slurry 2 used. In this way any abrasive particles in the vessel above Level "L" will further be prejudiced not to enter or travel along the conduit 14 and enter the conduit 21 through the fluid valve 13.
  • Figure 2 illustrates a second embodiment of the invention where a separate relief conduit 21 is provided.
  • conduit 21 is not connected to conduit 15, and serves purely as a route of escape for the compressed volume in vessel 11.
  • the second fluid valve 23 always operates on clean fluid, and the fluid valve 13 operates less frequently, ie. only at pressurisation and depressurisation stages. As a result, wear on valve 13 is decreased.
  • the provision of the second fluid valve 23 is preferred but not essential.
  • valve 13 may merely be opened and fluid may continue to flow into the vessel 11 through the conduit 14 and 15 (if this is not separately closed) but since the path of least resistance of the pressurised material within the vessel is through the conduit 21 , water will enter and merely exit above L thereby ensuring only water will exhaust through the conduit 21 out towards the nozzle 12. This flow will continue as long as the pump pressurising at the fluid source 10 continues to operate, the equilibrium of pressure of the compressed fluid is not reach and the valve 13 remains open.
  • a diaphragm pump 18 is used to draw fluid 4 from conduit 20, which creates a pressure in vessel 11 which in turn draws in abrasive slurry 2 from hopper 17 to vessel 11.
  • the diaphragm pump 18 is used to withdraw fluid through conduit 20 from the vessel creating a vacuum to draw in abrasive slurry 2 from the hopper 17 through conduit 19.
  • the system avoids fluid compressibility problems leading to unwanted discharging of abrasives to the nozzle at system pressurising and depressurising states.
  • the invention helps prevent nozzle blockages.
  • FIG. 3 an alternative configuration is shown wherein the delivery conduit is positioned to have the first opening submerged in the slurry.
  • a separate opening provided by the pressure relief conduit is required to be positioned above L.
  • the provision of the first opening 24 near the second 30 is that better mixing of the abrasive with the water to form the slurry is achieved nearer the second opening.
  • FIG 4 A further alternative is shown in figure 4 wherein the pressure relief conduit exhausts not into the uptake and delivery conduit but to a different location.
  • the invention described herein is susceptible to variations, modifications and/or additions other than those specifically described and it is to be understood that the invention includes all such variations, modifications and/or additions which fall within the spirit and scope of the above description.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Cyclones (AREA)
  • Nozzles (AREA)
  • Reciprocating Pumps (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

L'invention concerne un système à jet abrasif doté d'un moyen d'alimentation en fluide haute pression (10) alimentant en fluide un récipient (11) comportant une couche de boue abrasive et une couche supérieure constituée essentiellement de fluide, située au-dessus de la boue abrasive. Le système comprend également un premier conduit (14) s'étendant entre le moyen d'alimentation en fluide et la couche supérieure de fluide se trouvant dans le récipient, et un fluide haute pression est envoyé dans le récipient, ce qui induit le déplacement de la boue abrasive depuis un conduit de décharge (16). Ledit système comporte également un second conduit (21) et une soupape à fluide (13) prévue entre le raccord actif avec le premier conduit et le conduit de décharge, qui commande le débit de fluide dans le second conduit. La soupape à fluide est fermée lorsque le système est pressurisé, de sorte que la boue abrasive soit déplacée dans le conduit de décharge (16) et est ouverte lors de la dépressurisation du système, de sorte que le fluide s'écoule du premier conduit (14) dans le second et que la décharge de boue abrasive soit stoppée.
PCT/SG2002/000065 2001-04-21 2002-04-22 Systeme a jet de fluide abrasif WO2002085573A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US10/475,692 US20040198179A1 (en) 2001-04-21 2002-04-22 Abrasive fluid jet system
EP02723037A EP1389153B1 (fr) 2001-04-21 2002-04-22 Systeme a jet de fluide abrasif
KR1020037013766A KR100565549B1 (ko) 2001-04-21 2002-04-22 연마유체분사시스템
JP2002583135A JP4047175B2 (ja) 2001-04-21 2002-04-22 研磨流体ジェットシステム
CA2444951A CA2444951C (fr) 2001-04-21 2002-04-22 Systeme a jet de fluide abrasif
DE60212119T DE60212119T2 (de) 2001-04-21 2002-04-22 Schleifmittel-flüssigkeitsstrahl-vorrichtung
AT02723037T ATE306363T1 (de) 2001-04-21 2002-04-22 Schleifmittel-flüssigkeitsstrahl-vorrichtung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG200102219-3 2001-04-21
SG200102219A SG101445A1 (en) 2001-04-21 2001-04-21 Abrasive fluid jet system

Publications (1)

Publication Number Publication Date
WO2002085573A1 true WO2002085573A1 (fr) 2002-10-31

Family

ID=20430752

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG2002/000065 WO2002085573A1 (fr) 2001-04-21 2002-04-22 Systeme a jet de fluide abrasif

Country Status (12)

Country Link
US (1) US20040198179A1 (fr)
EP (1) EP1389153B1 (fr)
JP (1) JP4047175B2 (fr)
KR (1) KR100565549B1 (fr)
CN (1) CN1305642C (fr)
AT (1) ATE306363T1 (fr)
CA (1) CA2444951C (fr)
DE (1) DE60212119T2 (fr)
MY (1) MY129877A (fr)
SG (1) SG101445A1 (fr)
TW (1) TW515740B (fr)
WO (1) WO2002085573A1 (fr)

Cited By (4)

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US7059940B2 (en) 2002-09-13 2006-06-13 Towa Intercon Technology, Inc. Jet singulation
US7153186B2 (en) 2002-09-13 2006-12-26 Towa Intercon Technology, Inc. Jet singulation
CN102371547A (zh) * 2011-09-30 2012-03-14 安徽理工大学 混浆浓度可调的磨料水射流清洗和除锈设备
WO2017201293A1 (fr) * 2016-05-18 2017-11-23 Graco Minnesota Inc. Système de décapage par jet abrasif en phase vapeur à régulation de débit en boucle fermée

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KR100923322B1 (ko) 2005-01-18 2009-10-22 젠카이 조우 혼합 연마제 슬러리 제트분사용 블라스트 장치
US20060180579A1 (en) * 2005-02-11 2006-08-17 Towa Intercon Technology, Inc. Multidirectional cutting chuck
KR100775771B1 (ko) 2006-05-18 2007-11-15 김현동 샌드 브라스터
US8177993B2 (en) 2006-11-05 2012-05-15 Globalfoundries Singapore Pte Ltd Apparatus and methods for cleaning and drying of wafers
EP2197629B1 (fr) * 2007-08-21 2014-04-23 Abrasive Cutting Technology Ltd. Dispositif de découpage au jet de fluide/abrasif
CN106163742B (zh) * 2014-04-04 2018-04-03 艾恩特应用新技术公司 水‑磨料悬浮液切割设备
KR101549037B1 (ko) * 2015-01-26 2015-09-02 (주) 티오피에스 연마재 투입 속도가 향상된 습식 워터젯용 베셀 운용 방법
CN104786109B (zh) * 2015-04-30 2017-05-03 哈尔滨工业大学 一种挠性接头细筋底部电蚀层非接触式去除装置
US9638357B1 (en) 2015-06-24 2017-05-02 Omax Corporation Mechanical processing of high aspect ratio metallic tubing and related technology
US11577366B2 (en) 2016-12-12 2023-02-14 Omax Corporation Recirculation of wet abrasive material in abrasive waterjet systems and related technology
CA3058491A1 (fr) * 2017-03-31 2018-10-04 Ant Applied New Technologies Ag Installation et procede de decoupe par jet d'eau chargee d'abrasif en suspension
US11224987B1 (en) 2018-03-09 2022-01-18 Omax Corporation Abrasive-collecting container of a waterjet system and related technology
US11298799B2 (en) * 2018-05-03 2022-04-12 General Electric Company Dual sided shot peening of BLISK airfoils
US11719354B2 (en) 2020-03-26 2023-08-08 Hypertherm, Inc. Freely clocking check valve
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Also Published As

Publication number Publication date
SG101445A1 (en) 2004-01-30
CN1525901A (zh) 2004-09-01
CA2444951A1 (fr) 2002-10-31
MY129877A (en) 2007-05-31
DE60212119D1 (de) 2006-07-20
EP1389153A1 (fr) 2004-02-18
ATE306363T1 (de) 2005-10-15
US20040198179A1 (en) 2004-10-07
TW515740B (en) 2003-01-01
CN1305642C (zh) 2007-03-21
EP1389153B1 (fr) 2005-10-12
KR100565549B1 (ko) 2006-03-30
DE60212119T2 (de) 2006-11-09
CA2444951C (fr) 2010-07-13
JP4047175B2 (ja) 2008-02-13
KR20030090773A (ko) 2003-11-28
JP2004524178A (ja) 2004-08-12

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