AUTOMATIC GAIN CONTROL FOR MACHINE TOOL MONITOR

An acoustic tool break detector monitors vibration caused by a cutting process and has an analog amplifier to condition the signal, then searches for a rapid sustained change in signal level indicative of a cutting tool break. An automatic gain control circuit dynamically controls the gain of the an...

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Bibliographische Detailangaben
Hauptverfasser:	JAMES FREDERICK BEDARD, WALTER WHIPPLE III
Format:	Patent
Sprache:	eng
Schlagworte:	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 INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MACHINE TOOLS MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OFPARTICULAR DETAILS OR COMPONENTS MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES MEASURING METAL-WORKING NOT OTHERWISE PROVIDED FOR MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS PERFORMING OPERATIONS PHYSICS REGULATING TESTING TRANSPORTING
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Beschreibung
Zusammenfassung:	An acoustic tool break detector monitors vibration caused by a cutting process and has an analog amplifier to condition the signal, then searches for a rapid sustained change in signal level indicative of a cutting tool break. An automatic gain control circuit dynamically controls the gain of the analog amplifier and adjusts the output cutting noise signal to a desired average level during an active cut while allowing use of such a break algorithm. The time rate at which the AGC changes gain is constant and independent of gain; it is set such that a gain change of 2:1, for instance, takes longer than the confirmation period for a tool break. The analog amplifier has a variable attenuator whose gain is set by the outputs of an up/down counter; these outputs are fed back to a variable clock whose rate is dependent on gain at any instant. The clock outputs drive the counter until the analog cutting noise signal is within a preselected window.