Program restart assisting apparatus

A program restart assisting apparatus for assisting selection of a restart execution point indicating a position, on which machining is restarted after interruption of the machining, in a machining program, in a controller for controlling an industrial machine, the industrial machine machining a workpiece, based on the machining program, the program restart assisting apparatus comprising:

• a data acquisition unit configured to acquire time series data of a physical amount relating to the machining of the workpiece detected during continuing the machining;
• a machining state change point detection unit configured to detect a change point on which a machining state of the machining is changed, based on data acquired by the data acquisition unit;
• a restartable point recording unit configured to record the change point of the machining state, the change point being detected by the machining state change point detection unit, as a restartable point;
• and
• a restart execution point selection unit configured to select a restart execution point from among restartable points recorded by the restartable point recording unit;
• wherein the physical amount includes at least one of:
• (1) torque data, vibration data or sound data,
• (2) a motor temperature,
• (3) an amount, a shape or a color of chips,
• (4) laser output, or
• (5) biological information of an operator;
• and
• the machining state change point detection unit is configured to, based on the data acquired by the data acquisition unit, detect the change point by at least one of
• (a) performing a frequency analysis of the torque data, the vibration data, or the sound data which are detected in a predetermined machining period during the machining of the workpiece, and
• detecting time, at which a predetermined difference appears in frequency components, as the change point,
• (b) detecting time, at which a change rate of the motor temperature detected in a predetermined machining period during the machining of the workpiece is changed by a predetermined threshold value or greater, as the change point,
• (c) detecting time, at which the amount, the shape or the color of the chips is changed by a predetermined threshold value or greater based on image data which are detected in a predetermined machining period during the machining of the workpiece, as the change point,
• (d) detecting time, at which the laser output detected in a predetermined machining period during laser machining in the machining of the workpiece is changed by a predetermined threshold value or greater, as the change point, or
• (e) detecting a change in the biological information of the operator performing the machining with the industrial machine as the change point.