Vibration-damped high-speed tool holder

High-speed tool holder for accommodating a tool at its first end and for clamping it into a machine at its second end, the ends being arranged on the opposite sides of the longitudinal axis of the high-speed tool holder, the high-speed tool holder comprising:

• a) a tool shaft which is formed centrally along the longitudinal axis and defines the first end of the high-speed tool holder, a tool insertion opening (5) with a first bore (1e) for accommodating the tool being formed at the first end, and
• b) a machine clamping part (4) which is also formed centrally along the longitudinal axis and integrally connected to the tool shaft at an end opposite to the first end, and which forms an interface for clamping into the machine,
• c) the tool shaft being substantially truncated circular cone-shaped, with a first diameter (D1) at the first end with the tool insertion opening being smaller than a fifth diameter (D5) at the second end at the machine clamping part, and characterized in that
• d) a portion of the substantially truncated circular cone-shaped tool shaft having an outwardly bulging spherical or oval shape between the tool insertion opening and the machine clamping part, resulting in an additional material volume between the substantially truncated circular cone-shaped tool shaft and the outwardly bulging shape.