Patent ID: 8882412
Filing Date: 2014-11-11
Classification: B23B,B23P,Y10T

Abstract:
1. A cutting tool for performing hole-cutting operations on a workpiece when the cutting tool is rotated about a central longitudinal axis, the cutting tool comprising: a generally cylindrical body having a first end structured to be mounted to a machine tool and an opposite second end structured to engage and perform cutting operations on the workpiece, at least a portion of the second end being formed from a PCD material; a number of coolant passages defined in the generally cylindrical body, each coolant passage of the number of coolant passages disposed at a first helix angle relative to the central longitudinal axis; a number of flutes formed in the generally cylindrical body, each flute of the number of flutes having a first portion at or about the first end of the generally cylindrical body, a second portion at or about the second end of the generally cylindrical body, and a transition portion disposed therebetween, wherein the first portion of each flute is disposed generally at the first helix angle relative to the central longitudinal axis, the second portion of each flute is disposed generally at a second helix angle relative the central longitudinal axis, and the transition portion of each flute is disposed generally at a third helix angle relative to the central longitudinal axis, wherein the third helix angle is greater than the first helix angle, and wherein each coolant passage of the number of coolant passages terminates at an opening disposed at or about the transition portion of a corresponding flute of the number of flutes.