Drill with coolant channels and method for its manufacture

  • US 5,865,574 A
  • Filed: 07/03/1997
  • Issued: 02/02/1999
  • Est. Priority Date: 03/02/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for the manufacture of a spiral drill with coolant channels and pockets for two indexable inserts, comprising the steps of:

  • A) drilling in a cylindrical blank two straight holes spaced at different radial distances from a center line of the drill, the holes communicating with a first end face of the cylindrical blank and extending to a second end face of the blank in diverging directions;

    B) heating at least a middle portion of the blank;

    C) gripping first and second ends of the blank with chuck devices;

    D) applying a torque to the chuck devices to twist the middle portion by a predetermined angle to reform the holes into spirally curved channels such that each channel is spaced from a centerline of the drill by a distance which becomes progressively larger toward the second end face; and

    E) machining spiral flutes, a tip end face, and insert pockets in the blank subsequent to step D, the tip end face being machined in the second end face, and the insert pockets being machined in the tip end face.

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