WO2012103017A2 - Pièce de centrage adaptable à tête saillante - Google Patents

Pièce de centrage adaptable à tête saillante Download PDF

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Publication number
WO2012103017A2
WO2012103017A2 PCT/US2012/022236 US2012022236W WO2012103017A2 WO 2012103017 A2 WO2012103017 A2 WO 2012103017A2 US 2012022236 W US2012022236 W US 2012022236W WO 2012103017 A2 WO2012103017 A2 WO 2012103017A2
Authority
WO
WIPO (PCT)
Prior art keywords
workpiece
tip
toes
positioning fixture
fastener
Prior art date
Application number
PCT/US2012/022236
Other languages
English (en)
Other versions
WO2012103017A3 (fr
Inventor
William Palleva
William LEUTBECHER
Grant COYLE
Original Assignee
Perfect Point Edm Corporation
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 Perfect Point Edm Corporation filed Critical Perfect Point Edm Corporation
Publication of WO2012103017A2 publication Critical patent/WO2012103017A2/fr
Publication of WO2012103017A3 publication Critical patent/WO2012103017A3/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/26—Apparatus for moving or positioning electrode relatively to workpiece; Mounting of electrode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
    • B23H9/001—Disintegrating

Definitions

  • This disclosure relates to devices and methods for selectively positioning a forceless electrical emission device over a raised fastener head.
  • EDM Electric discharge machining
  • an electrode is brought into close proximity to the workpiece.
  • High voltage is applied in pulses at high frequency.
  • the process occurs in the presence of a dielectric fluid. This creates sparking at generally the closest position between the workpiece and the electrode. Particles are removed from the workpiece when sparking is quenched.
  • the duration of the spark (on-time) and the recovery time (off-time) are controlled so that the workpiece and electrode temperatures are not raised to the temperature of bulk melting. Therefore, erosion is essentially limited to a vaporization process wherein boluses of material are liberated from a workpiece.
  • devices, systems, and methods of the present disclosure are directed to an adaptable fixture with movable toes on flexible legs to position the erosion electrode of a forceless electrical emission disintegration device around the periphery of raised fasteners wherein the size shape or dimensions of a fastener head of the raised fastener vary from fastener to fastener.
  • devices, systems, and methods of the present disclosure are directed to positioning the erosion electrode of a forceless electrical emission disintegration device on raised fastener wherein the head dimensions vary from fastener to fastener.
  • the device provides the electrodes, a dielectric, dielectric containment, and fluid removal.
  • the device may be connected by a flexible umbilical to support equipment, which may include one or more of plasma power system, plasma controller, dielectric fluid pressurizing system, dielectric fluid delivery system, dielectric fluid drain system, dielectric fluid cleaning and deionization system as indicated in U.S. Application Serial No. 12/603,507.
  • the power system electrically energizes the erosion electrode.
  • devices, systems, and methods include a flushing system for hand held forceless electrical emission disintegration method and device.
  • the flushing system may include a temporarily sealable tip surrounding the erosion electrode of a hand-held device for forceless electrical emission disintegration device.
  • the erosion electrode is used in combination with said hand held device to remove material from a workpiece. Material liberated during erosion or cutting on a workpiece is dubbed "FOD," or foreign object debris.
  • a method and device to position the erosion electrode of a forceless electrical emission disintegration device at a selected location on the head or collar of a raised fastener In some instance a fixture device with flexible legs adaptively adjusts to varying head sizes on fasteners of the same type (size designation). In some instance a fixture device with flexible legs adaptively adjusts to varying head sizes on fasteners of similar size designation without the need to swap out positioning devices. Generally a one size fits more than one raised head or collar device.
  • FEED forceless electrical emission disintegration
  • a forceless electrical emission disintegration "FEED" device and method to for positioning a fixture with a reception around a raised head fastener whereby an eroding electrode maybe selectively positioned.
  • Said device having a plurality of flexible legs with toes having curved walls configured to interface with and to receive a raised head fastener.
  • Figure 1 shows a cut away view of a forceless electrical emission and disintegration device.
  • Figures 2 shows a plan view of a positioning base.
  • Figure 3 shows a cut-away view along the line A-A of Figure 2.
  • Figure 4 shows a component cut-away view of a forceless electrical emission device, corresponding positioning base and workpiece with fastener.
  • Figure 5 shows a partial view of a positioning base over a raised fastener in a workpiece.
  • Figure 6 shows a forceless electrical emission device in a positioning base during erosion.
  • a positioning method and device to place the erosion electrode of a forceless electrical emission disintegration device in a specific position within a hole, gap, cut, or guide is disclosed herein.
  • a hand-held device 10 for forceless electrical emission disintegration which may be positioned to remove a fastener 1000 which extends through a workpiece 2000 such as one or more frames.
  • fastener 1000 and fastener collar 1002 secure one the fastener to a workpiece.
  • any variety of fasteners and associated components may be the object upon which some exemplary implementations of the disclosed device and method may operate.
  • the base 20 may be configured to be held in the hand of the workman. Various configurations may be provided to provide hand-held operation of the device 10. According to some exemplary implementations, the base 20 may carry a switch 30 to activate components of the hand-held device 10, as disclosed herein.
  • a hood 40 mounted on a distal end of the base 25 is a hood 40.
  • the hood may be removable. If removable the hood 40 needs to be sealed against leakage of fluid through its mounting with the distal end of the base 25.
  • the hood 40 may be mounted around a collar 50, the collar being interposed between the distal end of the base 25 and the hood 40.
  • an ⁇ " rings 42 or other seal may be utilized to seal the base 10 at its collar 27 interface with the hood or other fixture (i.e. a positioning device) an ⁇ " rings 42 or other seal may be utilized.
  • the hood 40 defines a workspace 350, within which erosion activity may occur.
  • the hood 40 may be configured to seal against a portion of a workpiece 2000, such as a frame, thereby enclosing and /or defining the workspace such that the workspace includes access to at least a portion of a fastener 1000, a collar 1002, or a portion of the workpiece 2000.
  • the hood 40 may be configured to enclose the workspace so as to substantially isolate it from the environment outside the workspace. During erosion, substances within the workspace may be contained except through controlled inlets and outlets, as disclosed herein.
  • the hood 40 may be of a flexible or deformable material which may form a seal 45 that adaptably interfaces with the surface 2002 of the workpiece to create a seal at the interface 49.
  • a collar structure 60 for stabilizing the hand-held device 10 against a workpiece, such as at the surface 2002.
  • Inlet 70 and outlet 75 channels may be provided for passage of dielectric fluid there through.
  • the coolant fluid may in some instances be the dielectric fluid.
  • a dielectric fluid and a coolant fluid may be provided in sequence.
  • a coolant fluid may be provided after an erosion process has been completed.
  • the dielectric outlet 75 may evacuate the dielectric fluid generally from the workspace defined by the hood 40, wherein turbulence within the workspace provides opportunities for the dielectric fluid and other debris to be removed through the dielectric outlet 75.
  • hand-held forceless electrical emission disintegration device 10 may include a ground electrode 80 and erosion electrode 88.
  • the erosion electrode 88 may be configured to controllably approach a portion of a workpiece to be eroded, such as a fastener 1000, the distal end of the erosion electrode 89 disintegrates a channel 90 conforming to the electrode shape in the fastener.
  • the erosion electrode may be mechanically driven up and down within the base 20 via a controlled drive mechanism 500. Drive mechanisms are more fully detailed in U.S. Application Serial No. 12/603,507, filed 10/21/2009, and International application PCT/US10/55316, filed November 2, 2010 and are hereby incorporated as if fully set forth herein.
  • the collar 50 may be removable from the distal end of the base 25.
  • the collar 50 may be attached in a variety of well known variations and those of ordinary skill in the art will recognize the attachment means may depend on the intended usage or workpiece.
  • the collar 50 is shown in figure 1 being attached at the base-collar interface 52.
  • the attached collar is not a limitation and not required when the distal end of the device is sufficiently sealed against a workpiece to form a workspace.
  • a variety of electrode shapes, geometries, and morphologies may be provided for the erosion electrode 88. Electrode morphologies may be selected according to desired usage (i.e. erosion results and application specific variables).
  • an erosion tip positioning device (or "ETPD") 100 may include reception 200.
  • the ETPD may also be referred to as a positioning fixture.
  • the ETPD 100 replaces the hood 40.
  • a reception 200 is adapted to accept the collar 50 of the hand held tool 10.
  • a reception 200 may expose a bottom end 210 of ETPD 100 to a top portion 220 thereof.
  • Reception 200 may be configured to sealably receive at least a tip 300 of the hand held tool 10.
  • Said tip 300 in this exemplary implementation is, includes, or houses a plasma generating electrode.
  • Raised head or "button head” fasteners 1000 tend to have consistent shank 1010 portions with even diameters and are formed to high tolerances.
  • the head portion 1020 of a button fastener tends to be less consistent and even and there may be variation in diameter and other aspects in a lot of fasteners with very similar shank portions. Accordingly, to center an erosion electrode 88 on a raised fastener head 1020 benefits from a ETPD that adapts to variations in fastener head 1020 size and shape.
  • tip 300 may be brought to reception 200 of ETPD 100, which is placed on surface 2002 of a workpiece 2000 and in a desired alignment relative to the head 1020 of a fastener 1000. Tip 300 may be sealably placed within reception 200, such that workspace 350 is enclosed.
  • the geometry of reception 200 and tip 300 may be complementary, such that the mating thereof forms a seal there between.
  • the seal may be complete or substantial, according to some exemplary implementations.
  • workspace 420 may be defined by one or more of at least fastener 1000, surface 2002 of workpiece 2000, interface 330, gasket 225, ETPD 100, reception 20, and tip 300.
  • Workspace 350 may be formed by the placement of ETPD 100 relative to surface 2002 of workpiece 2000 and the placement of tip 300 relative to ETPD 100.
  • workspace 350 may be enclosed by the one or more seals formed, as disclosed herein.
  • the device 10 may be used to erode conductive materials such as fasteners or workpieces while tip 300 is engaged within reception 200.
  • fastener 1000 may be eroded with the hand tool.
  • the hand tool may be any device configured to operate on fastener 1000.
  • the hand tool may be a forceless electrical emission disintegration device "FEED" device or an EDM device used to erode at least a portion of fastener 1000.
  • FOD is produced during an erosion event. Managing FOD and/or cooling the workspace can benefit from the enclosed workspace 350 as disclosed herein.
  • the implementations shown in Figures 2-6 do not require a hood 40 to maintain a closed workspace.
  • ETPD 100 provides reception 200 which is a structure interior of the body 230.
  • the ETPD 100 has an annular wall structure 202 sealable with tip 300. Sealing elements such as ⁇ " rings may be added to the distal end 340 of the tip 300 to support a seal between ETPD 100 and the hand held device 10.
  • ETPD 100 provides a body 230 with a plurality of flexible legs 250 with a first proximal end attached to body 230 and a second end distal and having toes 260 affixed thereto the combined leg and toes are movable with said leg flexing.
  • the toes 260 are displaced by the fastener raised head 1020 thereby firmly placing the ETPD around the periphery of the fastener's raised head 1020 and accommodating variations in fastener's raised head 1020 size and dimensions.
  • a natural spring 270 is formed as part of the ETPD wherein the legs 250 are attached at a proximal end 275 to the body 230 of the ETPD and the toe 260 is formed at the distal end of the leg 250.
  • the legs 250 are attached at a proximal end 275 to the body 230 of the ETPD and the toe 260 is formed at the distal end of the leg 250.
  • a grab zone "GZ" wherein a distal surface 261 of the toes 260 is in contact with at least a portion of the fastener head 1020. In some instances said surface 261 is curved.
  • the movable toes 260 are shown adjacent to the reception and may also form a portion of the reception. Thereafter, tip 300 of a hand tool 10 such as a FEED device which may be generally similar to the collar 50 indicated in Figure 1 can be reversibly mated with the reception 200 of the ETPD.
  • the exemplary implementations shown in Figures 2-6 Distinct from the exemplary implementation shown in Figurel (wherein collar 50 at the distal end of the hand held tool 10 surround at least a portion of the erosion electrode and ground electrode and also is against the workpiece) the exemplary implementations shown in Figures 2-6 have a tip 300 at the distal end of the hand held tool 10 which is not against a workpiece. Rather, tip 300 mates with ETPD 100 and ETPD 100 seals against the workpiece. ETPD is in physical contact with fastener head 1020.
  • the positioning fixture (ETPD 100) which in physical contact with a fastener head 1020 contains the dielectric which may also be the flushing of fluid.
  • the ETPD also contains the FOD and provides for flushing and removal of FOD from the workspace.
  • Figure 6 shows the hand held tool (also referred to as the hand held device) 10 for forceless electrical emission disintegration with tip 300 mated sealably in ETDP 100.
  • the bottom end 210 of the ETPD is open to said reception 200 and contains at least a gasket 225.
  • the gasket 225 can be placed in contact with the surface 2002 of a workpiece 2000 thereby forming an interface 330 between the ETPD and workpiece.
  • the dielectric inlet 70 and dielectric outlet 75 are provided in fluid communication with the workspace 350 defined by at least one of the ETPD 100, workpiece surface 2002 and erosion electrode 88.
  • dielectric fluid may be provided to the workspace or the gap between the erosion electrode 88 and the workpiece by a variety of structures and methods.
  • the dielectric inlet 70 may provide targeted, high-velocity flow of the dielectric fluid directed to the spark gap 95 between erosion electrode 88 and the workpiece.
  • a dielectric outlet 75 provides a pathway to remove the dielectric flushing fluid from the workpiece and to also remove any erosion debris.
  • each physical element disclosed should be understood to encompass a disclosure of the action which that physical element facilitates.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Abstract

Cette invention concerne des dispositifs et des procédés de positionnement d'une pièce présentant une réception autour d'un élément de fixation à tête saillante afin de permettre le positionnement sélectif d'une électrode d'érosion. Ledit dispositif comprend une pluralité de pattes souples présentant des doigts à parois incurvées conçues pour faire interface avec un élément de fixation à tête saillante et recevoir celui-ci.
PCT/US2012/022236 2011-01-24 2012-01-23 Pièce de centrage adaptable à tête saillante WO2012103017A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201161461863P 2011-01-24 2011-01-24
US61/461,863 2011-01-24

Publications (2)

Publication Number Publication Date
WO2012103017A2 true WO2012103017A2 (fr) 2012-08-02
WO2012103017A3 WO2012103017A3 (fr) 2012-11-01

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PCT/US2012/022236 WO2012103017A2 (fr) 2011-01-24 2012-01-23 Pièce de centrage adaptable à tête saillante

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Country Link
WO (1) WO2012103017A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111069720A (zh) * 2018-10-22 2020-04-28 劳斯莱斯有限公司 放电加工工具及使用其的方法
EP3753662A3 (fr) * 2019-06-19 2021-03-10 Rolls-Royce plc Ensemble et procédé d'utilisation de l'ensemble
EP3812074A1 (fr) * 2019-10-14 2021-04-28 Rolls-Royce plc Composé et procédé d'utilisation du composé
EP4295982A1 (fr) 2022-06-16 2023-12-27 Scintam Engineering Ltd Usinage par électroérosion pour enlever des dispositifs de fixation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4259562A (en) * 1978-09-18 1981-03-31 Cammann Manufacturing Company, Inc. Portable disintegrator
US6203253B1 (en) * 1998-11-24 2001-03-20 Jamie A. Perrault Rivet drill-out guide
US7015411B2 (en) * 2001-07-20 2006-03-21 Eads Deutschland Gmbh Erosion system having an erosion head for removing metallic connection elements
US20100096365A1 (en) * 2008-10-21 2010-04-22 Kenneth Stewart Gold Hand-held electro-discharge device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4259562A (en) * 1978-09-18 1981-03-31 Cammann Manufacturing Company, Inc. Portable disintegrator
US6203253B1 (en) * 1998-11-24 2001-03-20 Jamie A. Perrault Rivet drill-out guide
US7015411B2 (en) * 2001-07-20 2006-03-21 Eads Deutschland Gmbh Erosion system having an erosion head for removing metallic connection elements
US20100096365A1 (en) * 2008-10-21 2010-04-22 Kenneth Stewart Gold Hand-held electro-discharge device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111069720A (zh) * 2018-10-22 2020-04-28 劳斯莱斯有限公司 放电加工工具及使用其的方法
EP3643441A1 (fr) * 2018-10-22 2020-04-29 Rolls-Royce plc Outil d'usinage par décharge électrique et son procédé d'utilisation
GB2578306A (en) * 2018-10-22 2020-05-06 Rolls Royce Plc An electro-discharge machining tool and a method of using the same
US11511361B2 (en) 2018-10-22 2022-11-29 Rolls-Royce Plc Electro-discharge machining tool and a method of using the same
EP3753662A3 (fr) * 2019-06-19 2021-03-10 Rolls-Royce plc Ensemble et procédé d'utilisation de l'ensemble
US11491566B2 (en) 2019-06-19 2022-11-08 Rolls-Royce Plc Electric discharge machining assembly
EP3812074A1 (fr) * 2019-10-14 2021-04-28 Rolls-Royce plc Composé et procédé d'utilisation du composé
EP4295982A1 (fr) 2022-06-16 2023-12-27 Scintam Engineering Ltd Usinage par électroérosion pour enlever des dispositifs de fixation

Also Published As

Publication number Publication date
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