Gear cutting – milling – or planing – Milling – Cutter spindle or spindle support
Patent
1999-03-03
2000-04-11
Bishop, Steven C.
Gear cutting, milling, or planing
Milling
Cutter spindle or spindle support
29447, 409232, B23Q 504
Patent
active
060481447
ABSTRACT:
The present invention relates to an improved spindle. The spindle uses improved shrink fit technology. This spindle is heated by means of an electric heating coil. This causes the internal diameter of the spindle bore to expand large enough to fit a toolholder that is manufactured to the predetermined size of 0.0015 per inch of diameter larger than the internal diameter of the spindle bore when both are measured at room temperature. After the toolholder is placed in the spindle a refrigerant blast cools the internal diameter of the spindle bore. This causes the spindle to grip the toolholder in an extremely rigid fashion having a desirable effect on the overall concentricity of the toolholder. The improved shrink fit technology is apparent when removing the toolholder from the spindle. The toolholder is manufactured using a predetermined type of steel with a lower thermal expansion rate than that of the internal diameter of the spindle bore. Also a refrigerant blast is directed through the toolholder as the internal diameter of the spindle bore is heated by conduction. For these reasons the toolholder is not heated by conduction at the same rate as the internal diameter of the spindle bore making for fast reliable removal of the toolholder from the spindle.
REFERENCES:
patent: 3678632 (1972-07-01), Eversole et al.
patent: 4723877 (1988-02-01), Erickson
patent: 4747735 (1988-05-01), Erickson et al.
patent: 5127780 (1992-07-01), Massa
patent: 5277435 (1994-01-01), Kramer et al.
patent: 5280671 (1994-01-01), Marquart
patent: 5311654 (1994-05-01), Cook
Bohler Chris E.
Bohler Lloyd C.
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