CA2108121A1 - Plasma arc cutting process and apparatus using an oxygen-rich gas shield - Google Patents

Plasma arc cutting process and apparatus using an oxygen-rich gas shield

Info

Publication number
CA2108121A1
CA2108121A1 CA002108121A CA2108121A CA2108121A1 CA 2108121 A1 CA2108121 A1 CA 2108121A1 CA 002108121 A CA002108121 A CA 002108121A CA 2108121 A CA2108121 A CA 2108121A CA 2108121 A1 CA2108121 A1 CA 2108121A1
Authority
CA
Canada
Prior art keywords
gas
flow
secondary gas
plasma arc
oxidizing
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
CA002108121A
Other languages
French (fr)
Other versions
CA2108121C (en
Inventor
Richard W. Couch, Jr.
Nicholas A. Sanders
Lifeng Luo
John Sobr
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.)
Hypertherm Inc
Original Assignee
Richard W. Couch, Jr.
Nicholas A. Sanders
Lifeng Luo
John Sobr
Hypertherm, 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27418407&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2108121(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from US07/682,991 external-priority patent/US5170033A/en
Priority claimed from US07/682,992 external-priority patent/US5166494A/en
Application filed by Richard W. Couch, Jr., Nicholas A. Sanders, Lifeng Luo, John Sobr, Hypertherm, Inc. filed Critical Richard W. Couch, Jr.
Priority to CA002409409A priority Critical patent/CA2409409C/en
Priority to CA002409420A priority patent/CA2409420C/en
Priority to CA002409405A priority patent/CA2409405C/en
Publication of CA2108121A1 publication Critical patent/CA2108121A1/en
Application granted granted Critical
Publication of CA2108121C publication Critical patent/CA2108121C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K10/00—Welding or cutting by means of a plasma
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K10/00—Welding or cutting by means of a plasma
    • B23K10/006—Control circuits therefor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/341—Arrangements for providing coaxial protecting fluids
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3442—Cathodes with inserted tip
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3468—Vortex generators
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3478—Geometrical details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/28—Cooling arrangements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/30—Plasma torches using applied electromagnetic fields, e.g. high frequency or microwave energy
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3421—Transferred arc or pilot arc mode
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3457—Nozzle protection devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3494—Means for controlling discharge parameters

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Mechanical Engineering (AREA)
  • Geometry (AREA)
  • Arc Welding In General (AREA)
  • Plasma Technology (AREA)

Abstract

A plasma arc torch (10) has a secondary gas flow (46) that is extremely large during piercing of a workpiece (36). The secondary flow (46) exits the torch immediately adjacent the transferred plasma arc (34) and is an extremely uniform, swirling flow. A
swirl ring (60) is located in the secondary gas flow path (50) at the exit point. A prechamber (58) feeds gas to the swirl ring (60), which is in turn fed through a flow restricting orifice (56). For certain applications the secondary gas (46) is a mixture of an oxidizing gas and a non-oxidizing gas in a flow ratio of oxydizing to non-oxidizing in the range of 2:3 to 9:1. A network (44) of conduits and solenoid valves (SV1-SV17) operated under the control of a central microprocessor (90) regulates the flows of plasma gas (42) and secondary gas (46) and mixes the secondary gas (46). The network (44) includes valued parallel branches (78,80,84,86) that provide a quick charge capability and a set of venting valves (SV11-SV14), also electrically actuated by the microprocessor (90), to provide a quick discharge. In a preferred high-definition embodiment, a nozzle (28) with a cut back outer surface and a large, conical head (28b) allows a metal seal and enhanced cooling.
CA002108121A 1991-04-12 1992-03-09 Plasma arc cutting process and apparatus using an oxygen-rich gas shield Expired - Lifetime CA2108121C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002409409A CA2409409C (en) 1991-04-12 1992-03-09 Nozzle for a plasma arc torch
CA002409420A CA2409420C (en) 1991-04-12 1992-03-09 Plasma arc cutting process and apparatus using an oxygen-rich gas shield
CA002409405A CA2409405C (en) 1991-04-12 1992-03-09 Control system for a gas flow to a plasma arc torch

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US682,992 1991-04-12
US682,991 1991-04-12
US07/682,991 US5170033A (en) 1990-04-24 1991-04-12 Swirl ring and flow control process for a plasma arc torch
US07/682,992 US5166494A (en) 1990-04-24 1991-04-12 Process and apparatus for reducing electrode wear in a plasma arc torch
US753,395 1991-08-30
US07/753,395 US5396043A (en) 1988-06-07 1991-08-30 Plasma arc cutting process and apparatus using an oxygen-rich gas shield
PCT/US1992/001872 WO1992018282A1 (en) 1991-04-12 1992-03-09 Plasma arc cutting process and apparatus using an oxygen-rich gas shield

Related Child Applications (3)

Application Number Title Priority Date Filing Date
CA002409409A Division CA2409409C (en) 1991-04-12 1992-03-09 Nozzle for a plasma arc torch
CA002409405A Division CA2409405C (en) 1991-04-12 1992-03-09 Control system for a gas flow to a plasma arc torch
CA002409420A Division CA2409420C (en) 1991-04-12 1992-03-09 Plasma arc cutting process and apparatus using an oxygen-rich gas shield

Publications (2)

Publication Number Publication Date
CA2108121A1 true CA2108121A1 (en) 1992-10-13
CA2108121C CA2108121C (en) 2003-11-11

Family

ID=27418407

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002108121A Expired - Lifetime CA2108121C (en) 1991-04-12 1992-03-09 Plasma arc cutting process and apparatus using an oxygen-rich gas shield

Country Status (7)

Country Link
US (2) US5396043A (en)
EP (1) EP0697935B1 (en)
JP (1) JP3172532B2 (en)
AU (3) AU660021B2 (en)
CA (1) CA2108121C (en)
DE (3) DE69229006T2 (en)
WO (1) WO1992018282A1 (en)

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DE69232651D1 (en) 2002-07-25
AU669313B2 (en) 1996-05-30
AU1365095A (en) 1995-05-18
US5396043A (en) 1995-03-07
AU678730B2 (en) 1997-06-05
EP0697935A4 (en) 1994-05-20
DE69229006D1 (en) 1999-05-27
DE69229006T2 (en) 1999-09-09
DE69232651T2 (en) 2002-11-21
AU660021B2 (en) 1995-06-08
JP3172532B2 (en) 2001-06-04
AU1772592A (en) 1992-11-17
DE69232651T3 (en) 2008-11-20
EP0697935A1 (en) 1996-02-28
US5591357A (en) 1997-01-07
DE69233071D1 (en) 2003-06-26
CA2108121C (en) 2003-11-11
DE69233071T2 (en) 2004-03-18
JPH06508793A (en) 1994-10-06
EP0697935B1 (en) 1999-04-21
WO1992018282A1 (en) 1992-10-29
DE69233071T3 (en) 2010-04-15
AU3456795A (en) 1996-01-25

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