Spindle unit and tool clamping device therein for machine tools
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United States of America Patent
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Aug 25, 1992
Grant Date -
N/A
app pub date -
Jan 8, 1991
filing date -
Jan 8, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A spindle unit comprising a solid shaft main spindle of a highly rigid material such as cemented carbide, with the main spindle being rotatably supported in a spindle head by bearings less apt to generate heat. A tool-clamping device including an adapter attached to a front end of the main spindle, and a tool holder carries a rotary tool. On of the adapter and the holder comprises a short columnar lug, with the other of the adapter and holder comprising a cylindrical hole shrinkage-fitted on the lug. The member having the hole is made of a material having a coefficient of thermal expansion lower than a coefficient of thermal expansion of the other member. The tool-clamping device further comprises heating and cooling devices for heating and cooling the member having the hole.
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