EP0283113A1 - Vorrichtung zum Aufsprühen eines abrasiven Fluids auf Werkstücke - Google Patents

Vorrichtung zum Aufsprühen eines abrasiven Fluids auf Werkstücke Download PDF

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Publication number
EP0283113A1
EP0283113A1 EP88300509A EP88300509A EP0283113A1 EP 0283113 A1 EP0283113 A1 EP 0283113A1 EP 88300509 A EP88300509 A EP 88300509A EP 88300509 A EP88300509 A EP 88300509A EP 0283113 A1 EP0283113 A1 EP 0283113A1
Authority
EP
European Patent Office
Prior art keywords
slurry
reservoir
chamber
conduit
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.)
Withdrawn
Application number
EP88300509A
Other languages
English (en)
French (fr)
Inventor
Alan Lawrence Holmstrand
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.)
Seagate Technology International
Original Assignee
Seagate Technology International
Magnetic Peripherals 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 Seagate Technology International, Magnetic Peripherals Inc filed Critical Seagate Technology International
Publication of EP0283113A1 publication Critical patent/EP0283113A1/de
Withdrawn legal-status Critical Current

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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
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump

Definitions

  • This invention relates to slurry dispensing apparatus, e.g. for use in conjunction with polishing or lapping apparatus and methods of dispensing slurry to workpieces.
  • polishing or lapping apparatus It is common in polishing or lapping apparatus to apply an abrasive slurry to a workpiece, which abrasive slurry is used in a polishing, lapping or finishing process.
  • Most known slurry supply and dispensing apparatus employs a mechanism, such as a needle or nozzle, for dispensing the slurry onto a workpiece. Slurry is pumped to the needle or nozzle from a reservoir, and a control mechanism controls the pressure and flow of slurry.
  • apparatus may be employed to recover, clean and return used slurry to the reservoir, but in most cases used slurry is simply discarded.
  • the present invention seeks to provide a slurry dispensing apparatus in which a discharge orifice of a needle or nozzle may be periodically cleaned without shutdown of the lapping or polishing apparatus of which it forms part.
  • a slurry dispensing apparatus for supplying a slurry to a workpiece characterised by comprising: reservoir means for containing a supply of slurry; first conduit means in fluid communication with said reservoir means; selectively operable pressure means operable to force slurry from said reservoir means into said first conduit means; needle or nozzle means for supplying slurry to a workpiece; bypass means connecting said first conduit means to said needle or nozzle means to supply slurry under pressure from said first conduit means to said needle or nozzle means, said bypass means, in operation, diverting excess slurry; second conduit means connected to said bypass means for receiving said excess slurry from said first conduit means; chamber means, in operation, positioned at an elevation below said bypass means and connected to said second conduit means to receive said excess slurry; and delivery means for delivery of slurry in said chamber means to said reservoir means, said delivery means including normally closed first valve means, so that, in operation, when slurry is forced from said reservoir means to said needle or nozzle means, excess
  • said reservoir means is a sealed reservoir and said pressure means comprises a gaseous pressure source in fluid communication with said reservoir means, second valve means selectively connecting said reservoir means to said gaseous pressure source or to atmosphere, said first valve means comprising a check valve for permitting flow of slurry through said delivery means when the pressure in said reservoir means is not greater than in said chamber means.
  • said chamber means is a sealed chamber, check valve means being provided for venting said chamber means to atmosphere when the pressure within said chamber means exceeds atmospheric pressure.
  • said needle or nozzle means is, in operation, disposed at an elevation higher than said reservoir means.
  • a method of dispensing slurry to a workpiece through an orifice of needle or nozzle means and periodically purging said orifice characterised by comprising the steps of: supplying slurry under pressure to said orifice by transporting slurry to a bypass chamber with which said orifice is in fluid communication, and diverting excess slurry to a bypass conduit; and periodically reversing transport of slurry from said bypass chamber to create a sub-­atmospheric pressure within said bypass chamber thereby drawing air into said bypass chamber through said orifice to purge the same.
  • a reservoir preferably supplies slurry to the bypass chamber, the slurry being transported to said bypass chamber by creating a pressure within said reservoir, and the reversing transport of slurry being accomplished by reducing the pressure in said reservoir to atmospheric pressure.
  • An intermediate chamber may receive excess slurry from said bypass conduit, excess slurry being returned from said intermediate chamber to said reservoir when the pressure in said reservoir is reduced to atmospheric pressure.
  • purging and cleaning of the slurry dispensing apparatus may require only a few seconds as opposed to several minutes required to replace clogged needles or nozzles in the conventional apparatus, so that cleaning may be accomplished during polishing, lapping, etc. processes.
  • the needle or nozzle means can be cleaned more often than in conventional apparatus, lessening the likelihood of clogging. As a result, shutdowns are less frequent and costly repairs are less likely.
  • a reservoir 10 contains a slurry 12 to be applied through a needle or nozzle 14 to a workpiece (not shown).
  • a supply conduit 16 supplies slurry to a bypass chamber 18 which, in turn, supplies slurry to the needle or nozzle 14.
  • Slurry in the conduit 16 is ordinarily under pressure, it being preferred that the reservoir 10 is an enclosed reservoir pressurised by compressed gas introduced to a conduit 20 and applied to the reservoir 10 by way of a regulator 22 and a 3-way valve 24.
  • a gauge 26 is employed to measure the pressure in the conduit 20.
  • the valve 24 provides communication between a conduit 21 connected to the interior of the reservoir 10 and either the conduit 20 or to atmosphere via a conduit 28.
  • the reservoir 10 includes a magnet 40 and a magnetic actuator 42 to agitate the slurry, maintaining abrasive material in the slurry uniformly suspended in a liquid carrier or lubricant.
  • the reservoir 10 is preferably at a lower elevational position than the intermediate chamber 32, which in turn is at a lower elevational position than the bypass chamber 18 and the needle or nozzle 14.
  • the intermediate chamber 32 is opened to atmosphere through a conduit 36.
  • a check valve 44 may be placed in the conduit 36 to open only when the pressure in the chamber 32 exceeds atmospheric pressure.
  • the needle or nozzle 14 is interchangeable for different applications.
  • gas or air under pressure is admitted through the conduit 20 and the valve 24 to pressurise the enclosed chamber of the reservoir 10 to a suitable pressure, such as 140 - 560 g/cm2 (2 - 8 psig).
  • a suitable pressure such as 140 - 560 g/cm2 (2 - 8 psig).
  • Slurry is forced upwardly through the conduit 16 to the bypass chamber 18 and through the needle or nozzle 14 to the workpiece.
  • the pressure in the bypass chamber 18 created by the back pressure within the conduit 30, causes a small amount of slurry to flow through a discharge orifice of the needle or nozzle 14.
  • With relatively small conduits 16,30 a relatively high volume of slurry can pass through the bypass chamber 18 from the conduit 16 to the conduit 30 for small amounts of slurry metered through the needle or nozzle 14.
  • slurry transport velocities may be high to maintain the abrasive in suspension and yield a uniform mixture of slurry discharged through the needle or nozzle 14.
  • Excess slurry is bypassed through the chamber 18 and the conduit 30 to the intermediate chamber 32, which is at a lower elevation than the bypass chamber 18.
  • the check valve 38 prevents slurry in the intermediate chamber 32 from returning to the reservoir 10 through the conduit 34 because the check valve 38 is closed by virtue of the pressure within the reservoir 10.
  • valve 24 When it is desired to purge the apparatus, the valve 24 is moved to a second position to vent the interior of the reservoir 10 through the conduits 21,28 to atmosphere. This reduces the pressure within the reservoir 10, removing the pressure from the slurry in the conduit 16.
  • air is drawn through the needle or nozzle 14 into the bypass chamber 18 thereby to clean the needle or nozzle and purge it of slurry and any foreign material.
  • conduits 16,30 are relatively small, for example, 3.2 mm (one-­eighth inch) O.D. (outside diameter), to support a capillary column of slurry to create the desired reduced pressure during cleaning and purging cycles.
  • the conduits 34,36,20,21,28 are relatively large, for example, 6.4 mm (one-quarter inch) O.D. to permit quick ventilation and pressure changes and rapid draining of slurry from the intermediate chamber 32 to the reservoir 10.
  • the needle or nozzle 14 should be at the highest gravitational elevation of the apparatus thereby aiding in the backflow or flushing of the apparatus. Also, it is advantageous that the conduit 16 is connected below the conduit 30 to the bypass chamber 18 to aid in supporting the desired flows and pressures.
  • the cleaning or purging of the apparatus requires only a few seconds and can be accomplished without interrupting a lapping or polishing operation.
  • the purging can be set to be automatically accomplished at regular intervals, such as every minute or two, by an electronic timer (not shown) operating the valve 24.
  • the vent conduit 36 which vents the intermediate chamber 32 to atmosphere includes the check valve 44 which closes as the slurry in the intermediate chamber 32 drains into the reservoir 10.
  • the inclusion of the check valve 44 offers the additional advantage that all air employed to purge the system must be admitted through the needle or nozzle 14, thereby assuring full cleaning.
  • a considerably longer time would be required to drain slurry from the intermediate chamber 32 to the reservoir 10.
  • the cleaning and purging cycle can be accomplished without interrupting the lapping or polishing operation, and the slurry in the conduit 30 provides an adequate vacuum to purge the orifice of the needle or nozzle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP88300509A 1987-02-17 1988-01-21 Vorrichtung zum Aufsprühen eines abrasiven Fluids auf Werkstücke Withdrawn EP0283113A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1577487A 1987-02-17 1987-02-17
US15774 1987-02-17

Publications (1)

Publication Number Publication Date
EP0283113A1 true EP0283113A1 (de) 1988-09-21

Family

ID=21773538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88300509A Withdrawn EP0283113A1 (de) 1987-02-17 1988-01-21 Vorrichtung zum Aufsprühen eines abrasiven Fluids auf Werkstücke

Country Status (2)

Country Link
EP (1) EP0283113A1 (de)
JP (1) JPS63202518A (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3019522A (en) * 1958-06-23 1962-02-06 John M Bluth Reformation of metallic surfaces
US3559351A (en) * 1968-06-28 1971-02-02 Edward S Richter Method for treating metals
FR2555469A1 (fr) * 1983-11-25 1985-05-31 Berthoud Sa Perfectionnements aux installations agricoles de pulverisation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3019522A (en) * 1958-06-23 1962-02-06 John M Bluth Reformation of metallic surfaces
US3559351A (en) * 1968-06-28 1971-02-02 Edward S Richter Method for treating metals
FR2555469A1 (fr) * 1983-11-25 1985-05-31 Berthoud Sa Perfectionnements aux installations agricoles de pulverisation

Also Published As

Publication number Publication date
JPS63202518A (ja) 1988-08-22

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