Patent ID: 6682275
Filing Date: 2004-01-27
Classification: B23B,Y10S,Y10T

Abstract:
A deep hole drill for chip-removing drilling in a workpiece comprising:a body including a cutting head and an integral connecting part adapted for connection to a drill tube, the body defining a longitudinal axis of rotation and having a longitudinal internal channel opening into an end face of the cutting head for receiving and conducting cuttings entrained in a cooling medium; a chip-removing insert disposed on the cutting head; a support pad disposed on a generally cylindrical outer peripheral surface of the cutting head; and a guide bar disposed on the outer peripheral surface in circumferentially spaced relationship to the support pad; wherein a first cooling duct having a first cross-sectional area is formed in the outer peripheral surface and oriented generally parallel to the axis, the first cooling duct opening at the end face for conducting cooling medium toward the end face and is situated adjacent the support pad for cooling the support pad, and a second cooling duct having a second cross-sectional area is formed in the outer peripheral surface in circumferentially spaced relationship to the first cooling duct, the second cooling duct oriented generally parallel to the axis and opening at the end face for conducting cooling medium thereto, wherein the first and second cross-sectional areas are different from each other.