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Laser hardened steel cutting rule

  • US 6,218,642 B1
  • Filed: 07/12/1999
  • Issued: 04/17/2001
  • Est. Priority Date: 07/12/1999
  • Status: Expired due to Fees
First Claim
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1. A method of surface hardening a metal workpiece, comprising the steps of:

  • a first step of applying a first laser beam having a first intensity and focused to a first focal point to a selected surface area of said metal workpiece; and

    a second step of applying a second laser beam having a second intensity and focused to a second focal point to said selected surface area, wherein, in said first step of applying said first laser beam to said selected surface area, said selected surface area is heat treated to a predetermined depth resulting in an increased hardness of said selected surface area, and wherein, in said second step of applying said second laser beam to said selected surface area, said selected surface area is stress relieved of internal stresses produced by said heat treating.

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