Drill insert geometry having V-notched web

  • US 7,371,035 B2
  • Filed: 02/17/2006
  • Issued: 05/13/2008
  • Est. Priority Date: 03/27/2001
  • Status: Active Grant
First Claim
Patent Images

1. A drill insert comprising:

  • a drill insert body having a first end opposite a second end, a first face side opposite and parallel to a second face side, a pair of apertures formed through the face sides, and a first land side opposite a second land side, the first and second land sides formed between the ends and the face sides;

    wherein at least a portion of the first end of the drill body is a generally planar surface;

    wherein the second end comprises at least two main cutting edges formed transverse to each other and substantially parallel to the first and second face sides respectively, a web formed between the two main cutting edges, and a web thinning notch formed on either side of a chisel forming the web;

    wherein each web thinning notch forms a notch cutting edge adjacent to and radially inward from one main cutting edge of the at least two main cutting edges, wherein each notch cutting edge has a positive rake angle, wherein the positive rake angle is formed on each notch cutting edge without substantial weakening of the insert at the center portion thereof.

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