초록 ▼

A machining apparatus having a main spindle supported by magnetic bearings which controls machining conditions by controlling electric current values flowing in electromagnets according to predetermined conditions, thereby obtaining an optimum machining condition and thus improving accuracy and mach

A machining apparatus having a main spindle supported by magnetic bearings which controls machining conditions by controlling electric current values flowing in electromagnets according to predetermined conditions, thereby obtaining an optimum machining condition and thus improving accuracy and machining efficiency. The machining apparatus comprises a spindle having a tool at its one end, electromagnets for radially and axially supporting the spindle by magnetic force without contact to the spindle, position detecting means for detecting radial and axial positions of the spindle, control means responsive to outputs from the position detecting means for controlling current flowing in the electromagnets, current measuring means for measuring current values flowing in at least one of the electromagnets, and machining control means for controlling machining conditions by controlling current values at the electromagnets according to the measured current values.

대표청구항 ▼

A machining apparatus having a main spindle supported by magnetic bearings, comprising: a spindle having means at one end thereof for holding a tool; electromagnets for radially and axially supporting said spindle by magnetic forces without contacting said spindle; position detecting means for detec

A machining apparatus having a main spindle supported by magnetic bearings, comprising: a spindle having means at one end thereof for holding a tool; electromagnets for radially and axially supporting said spindle by magnetic forces without contacting said spindle; position detecting means for detecting radial and axial position of said spindle; control means responsive to outputs from said position detecting means for controlling currents flowing in said electromagnets; current means for measuring current values in at least one of said electromagnets; and machining control means for controlling at least one controllable variable by controlling current values flowing in said electromagnets according to said measured current values.