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Title: Laser cutting nozzle

Abstract

A laser cutting nozzle for use with a laser cutting apparatus directing a focused beam to a spot on a work piece. The nozzle has a cylindrical body with a conical tip which together have a conically shaped hollow interior with the apex at a small aperture through the tip. The conical hollow interior is shaped to match the profile of the laser beam, at full beamwidth, which passes through the nozzle to the work piece. A plurality of gas inlet holes extend through the body to the hollow interior and are oriented to produce a swirling flow of gas coaxially through the nozzle and out the aperture, aligned with the laser beam, to the work piece. BACKGROUND OF THE INVENTION

Inventors:
 [1]
  1. (Brentwood, CA)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
865141
Patent Number(s):
US 4467171
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
laser; cutting; nozzle; apparatus; directing; focused; beam; spot; piece; cylindrical; conical; tip; conically; shaped; hollow; interior; apex; aperture; match; profile; beamwidth; passes; plurality; gas; inlet; holes; extend; oriented; produce; swirling; flow; coaxially; aligned; background; hollow interior; gas inlet; laser beam; focused beam; laser cutting; cutting apparatus; cutting nozzle; conically shaped; /219/

Citation Formats

Ramos, Terry J. Laser cutting nozzle. United States: N. p., 1984. Web.
Ramos, Terry J. Laser cutting nozzle. United States.
Ramos, Terry J. 1984. "Laser cutting nozzle". United States. doi:. https://www.osti.gov/servlets/purl/865141.
@article{osti_865141,
title = {Laser cutting nozzle},
author = {Ramos, Terry J.},
abstractNote = {A laser cutting nozzle for use with a laser cutting apparatus directing a focused beam to a spot on a work piece. The nozzle has a cylindrical body with a conical tip which together have a conically shaped hollow interior with the apex at a small aperture through the tip. The conical hollow interior is shaped to match the profile of the laser beam, at full beamwidth, which passes through the nozzle to the work piece. A plurality of gas inlet holes extend through the body to the hollow interior and are oriented to produce a swirling flow of gas coaxially through the nozzle and out the aperture, aligned with the laser beam, to the work piece. BACKGROUND OF THE INVENTION},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1984,
month = 1
}

Patent:

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  • A laser cutting nozzle for use with a laser cutting apparatus directing a focused beam to a spot on a work piece. The nozzle has a cylindrical body with a conical tip which together have a conically shaped hollow interior with the apex at a small aperture through the tip. The conical hollow interior is shaped to match the profile of the laser beam, at full beamwidth, which passes through the nozzle to the work piece. A plurality of gas inlet holes extend through the body to the hollow interior and are oriented to produce a swirling flow of gasmore » coaxially through the nozzle and out the aperture, aligned with the laser beam, to the work piece.« less
  • A laser cutting nozzle for use with a laser cutting apparatus directing a focused beam to a spot on a work piece. The nozzle has a cylindrical body with a conical tip which together have a conically shaped hollow interior with the apex at a small aperture through the tip. The conical hollow interior is shaped to match the profile of the laser beam, at full beamwidth, which passes through the nozzle to the work piece. A plurality of gas inlet holes extend through the body to the hollow interior and are oriented to produce a swirling flow of gasmore » coaxially through the nozzle and out the aperture, aligned with the laser beam, to the work piece.« less
  • A shroud for a submerged jet cutting nozzle is described which separates the jet from surrounding fluid environment and enhances the cutting effect.
  • A plasma torch comprises a handle having an upper end which houses the components forming a torch body. Body incorporates a rod electrode having an end which cooperates with an annular tip electrode to form a spark gap. An ionizable fuel gas is fed to the spark gap via tube within the handle, the gas from tube flowing axially along rod electrode and being diverted radially through apertures so as to impinge upon and act as a coolant for a thin-walled portion of the annular tip electrode. With this arrangement the heat generated by the electrical arc in the inter-electrodemore » gap is substantially confined to the annular tip portion of electrode which is both consumable and replaceable in that portion is secured by screw threads to the adjoining portion of electrode and which is integral with the thin-walled portion.« less
  • This investigation applies sonic and supersonic coaxial and off-axis nozzles to the cutting of mild steel sheet of 1 to 4 mm thickness. A 1 kW CW CO{sub 2} laser is used with nitrogen as the assist gas. Sonic coaxial cutting is compared to that of off-axis nozzles which vary in orientation from 20-60{degrees} behind the laser axis, and in exit Mach number from 1 to 2.4. Results show a 50% increase in maximum cutting speed at about a 40{degrees} nozzle angle. In comparison, variations in nozzle exit Mach number have little effect. A scale-model kerf was used to visualizemore » the kerf gas dynamics, revealing that nozzle angles of 0-20{degrees} cause a shock wave/boundary layer interaction with flow separation inside the kerf. Angles of 20-45{degrees} alleviate this interaction, producing a uniform supersonic flow throughout the kerf which yields high cutting speeds due to high shear forces. For nozzle angles greater than 45{degrees} the assist gas is diverted away from the kerf, reducing cutting speed. Compared to nozzle angle, exit Mach number was found to be of secondary importance.« less