CONTROL DEVICE AND METHOD FOR ACOUSTICALLY DETECTING A CONTACT BETWEEN A CUTTING TOOL AND A WORKPIECE

摘要

A DEVICE AND METHOD FOR CONTROLLING CUTTING PLATE VIBRATION 18 OF THE CUTTING TOOL OF A MACHINE TOOL AND INTERPRETATION OF VIBRATIONS SO DETAILED TO RAPIDLY DETECT THE INITIAL CONTACT WITH THE PART AND TO PROVOKE STOPPING THE TOOL BEFORE DAMAGE TO THE SURFACE. THE SIGNAL PRODUCED BY A 21 OR 23 DETECTOR, SUCH AS AN ACCELEROMETER IS PRETREATED TO ELIMINATE THE LOWER FREQUENCY NOISE OF THE MACHINE AND DETECT ENERGY IN A HIGHER FREQUENCY BAND, THEN SUBJECT TO SAMPLING AND ANALYSIS BY A DIGITAL CIRCUIT. IN ORDER TO AVOID FALSE ALARMS DUE TO HIGH AMPLITUDE NOISE PULSES CAUSED BY THE OPERATION OF THE MACHINE TOOL, THE ALARM FOR CONTACT WITH THE TOOL IS DELAYED BY A TIME LONGER THAN THE MAXIMUM PERIOD OF PULSES OF NOISE. DESCRIPTION OF TWO TECHNIQUES FOR IGNORING NOISE POINTS WHILE DETECTING THE CONTACT SIGNAL WITH THE TOOL. / P P APPLICATION TO THE SIZING OF PARTS THROUGH THE TOOL ON MACHINE TOOLS. / P