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Title: Contour forming of metals by laser peening

Abstract

A method and apparatus are provided for forming shapes and contours in metal sections by generating laser induced compressive stress on the surface of the metal workpiece. The laser process can generate deep compressive stresses to shape even thick components without inducing unwanted tensile stress at the metal surface. The precision of the laser-induced stress enables exact prediction and subsequent contouring of parts. A light beam of 10 to 100 J/pulse is imaged to create an energy fluence of 60 to 200 J/cm.sup.2 on an absorptive layer applied over a metal surface. A tamping layer of water is flowed over the absorptive layer. The absorption of laser light causes a plasma to form and consequently creates a shock wave that induces a deep residual compressive stress into the metal. The metal responds to this residual stress by bending.

Inventors:
 [1];  [2]
  1. Livermore, CA
  2. Rocklin, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
874542
Patent Number(s):
6410884
Assignee:
The Regents of the University of California (Oakland, CA)
Patent Classifications (CPCs):
C - CHEMISTRY C21 - METALLURGY OF IRON C21D - MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
B - PERFORMING OPERATIONS B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL B21D - WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
contour; forming; metals; laser; peening; method; apparatus; provided; shapes; contours; metal; sections; generating; induced; compressive; stress; surface; workpiece; process; generate; deep; stresses; shape; thick; components; inducing; unwanted; tensile; precision; laser-induced; enables; exact; prediction; subsequent; contouring; light; beam; 10; 100; jpulse; imaged; create; energy; fluence; 60; 200; jcmsup2; absorptive; layer; applied; tamping; water; flowed; absorption; causes; plasma; form; consequently; creates; shock; wave; induces; residual; responds; bending; laser light; light beam; residual stress; metal workpiece; /219/

Citation Formats

Hackel, Lloyd, and Harris, Fritz. Contour forming of metals by laser peening. United States: N. p., 2002. Web.
Hackel, Lloyd, & Harris, Fritz. Contour forming of metals by laser peening. United States.
Hackel, Lloyd, and Harris, Fritz. Tue . "Contour forming of metals by laser peening". United States. https://www.osti.gov/servlets/purl/874542.
@article{osti_874542,
title = {Contour forming of metals by laser peening},
author = {Hackel, Lloyd and Harris, Fritz},
abstractNote = {A method and apparatus are provided for forming shapes and contours in metal sections by generating laser induced compressive stress on the surface of the metal workpiece. The laser process can generate deep compressive stresses to shape even thick components without inducing unwanted tensile stress at the metal surface. The precision of the laser-induced stress enables exact prediction and subsequent contouring of parts. A light beam of 10 to 100 J/pulse is imaged to create an energy fluence of 60 to 200 J/cm.sup.2 on an absorptive layer applied over a metal surface. A tamping layer of water is flowed over the absorptive layer. The absorption of laser light causes a plasma to form and consequently creates a shock wave that induces a deep residual compressive stress into the metal. The metal responds to this residual stress by bending.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

Patent:

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