Title:
TOOL BREAKAGE DETECTING SYSTEM
Document Type and Number:
WIPO Patent Application WO/1996/019316
Kind Code:
A1
Abstract:
A tool breakage detecting system adapted to detect the breakage of a tool with a high accuracy which occurs in some cases even when a load is not substantially imparted to a rotary shaft and a tool feed shaft. The disturbance load torque of a main shaft and a shaft for relatively moving a work and a tool is monitored by a rotary shaft disturbance load torque estimating means (1) and a moving shaft disturbance load torque estimating means (2), and also the disturbance load torque of a shaft which does not relatively move a work and a tool by stationary shaft disturbance load torque estimating means (3, 4). The breakage of the tool is judged by a comparison means (5) on the basis of the estimated disturbance load torque from these estimating means, and, when the breakage of the tool is detected, the machine is stopped by a machine stoppage command means (6).
Inventors:
NAGATOMI TAKASHI (JP)
SAKAGUCHI MIWAKO (JP)
SAKAGUCHI MIWAKO (JP)
Application Number:
PCT/JP1995/002154
Publication Date:
June 27, 1996
Filing Date:
October 19, 1995
Export Citation:
Assignee:
FANUC LTD (JP)
NAGATOMI TAKASHI (JP)
SAKAGUCHI MIWAKO (JP)
NAGATOMI TAKASHI (JP)
SAKAGUCHI MIWAKO (JP)
International Classes:
B23B47/24; B23Q17/09; G05B9/02; G05B19/18; G05B19/4065; (IPC1-7): B23Q17/09
Foreign References:
| JPH0751991A | 1995-02-28 | |||
| JPH06170697A | 1994-06-21 |
Other References:
See also references of EP 0749804A4
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