Tool Holder and Tool Holder Attachment Structure
AssigneeNikken Kosakusho Works Ltd.
InventorSusumu MIKADO
Life of this patent
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Abstract
A tool holder attachment structure includes a spindle and a tool holder. The spindle has a tip end face and a tapered hole. The tool holder has a tapered shank portion and a flange end face. In a clamped state, there is a clearance of a predetermined size between the flange end face of the tool holder and the tip end face of the spindle. As the spindle is rotated, the tapered hole of the spindle is slightly expanded by a centrifugal force caused by rotation of the spindle, and the presence of this clearance allows the tapered shank portion to be further drawn into the tapered hole so that the flange end face of the tool holder closely contacts the tip end face of the spindle, and the tapered shank portion is closely fitted in the tapered hole, whereby two-face restraint is implemented.
Claims5
A tool holder attachment structure, comprising:
- a spindle of a machine tool having a tip end face and a tapered hole extending axially inward from said tip end face;
- and
- a tool holder having a tapered shank portion that fits in said tapered hole of said spindle, and a flange end face that faces said tip end face of said spindle, wherein
- said tapered shank portion is drawn into said tapered hole to clamp said tool holder to said spindle,
- in said clamped state, there is a clearance of a predetermined size between said flange end face of said tool holder and said tip end face of said spindle,
- as said spindle is rotated, said tapered hole of said spindle is slightly expanded by a centrifugal force caused by the rotation of said spindle, and the presence of said clearance of said predetermined size allows said tapered shank portion to be further drawn into said tapered hole so that said flange end face of said tool holder closely contacts said tip end face of said spindle, and said tapered shank portion is closely fitted in said tapered hole, whereby two-face restraint is implemented.
A tool holder that is attached to a spindle of a machine tool, said spindle having a tip end face and a tapered hole extending axially inward from said tip end face, and said tapered hole being slightly expanded by a centrifugal force when said spindle is rotated, comprising:
- a tapered shank portion that fits in said tapered hole of said spindle;
- and
- a flange end face that faces said tip end face of said spindle, wherein
- in a state where said tool holder is drawn into said tapered hole of said spindle and clamped therein, said flange end face is separated from said tip end face of said spindle by a clearance, and
- in a state where said spindle is rotated, said flange end face closely contacts said tip end face of said spindle.
Dependencies are inferred from the claim text.