ACOUSTIC MONITORING OF CUTTING CONDITIONS TO DETECT TOOL BREAK EVENTS

This tool break detection system relies on monitoring changes in the cutting noise itself, rather than detecting the tool fracture acoustic signal. A broken tool capable of damaging the workpiece is detected, and tool break events that do not affect cutting conditions are ignored. The signal from a...

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Bibliographic Details
Main Authors JAMES FREDERICK BEDARD, MINYOUNG LEE, CHARLES EDMUND THOMAS, STEVEN ROBERT HAYASHI
Format Patent
LanguageEnglish
Published 26.10.1988
Edition4
Subjects
BORING
COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOTDIRECTED TO A PARTICULAR RESULT
CONTROL OR REGULATING SYSTEMS IN GENERAL
CONTROLLING
DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g.ARRANGEMENTS FOR COPYING OR CONTROLLING
FUNCTIONAL ELEMENTS OF SUCH SYSTEMS
MACHINE TOOLS
MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OFPARTICULAR DETAILS OR COMPONENTS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS
PERFORMING OPERATIONS
PHYSICS
REGULATING
TRANSPORTING
TURNING
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Summary:This tool break detection system relies on monitoring changes in the cutting noise itself, rather than detecting the tool fracture acoustic signal. A broken tool capable of damaging the workpiece is detected, and tool break events that do not affect cutting conditions are ignored. The signal from a sensor such as an accelerometer is preprocessed to attenuate low frequency machinery noise and detect the signal energy in a band below 100 KHz, then sampled, and the digitized signal samples analyzed by pattern recognition logic. Runout false alarms during rough surface cutting are prevented; after detection of an abrupt increase or decrease in signal level, the confirmation period to test for a persistent shift in mean level is set longer than the workpiece revolution period.
Bibliography:Application Number: GB19850026094