Patent ID: 11927934
Assignee: DISCO CORPORATION
Field: Control (Instruments)
Classification: CPC B  G | IPC G

Claim 0:
1. A cutting apparatus comprising:
a chuck table for holding a workpiece thereon;
a cutting unit for cutting the workpiece held on the chuck table with a cutting blade mounted on a spindle; and
a management unit for managing the cutting blade mounted on the spindle,
wherein the management unit includes:
a light emitter,
a light receiver facing the light emitter, for receiving light emitted from the light emitter,
a measuring unit for measuring an amount of light emitted from the light emitter and received by the light receiver while the cutting blade is positioned between the light emitter and the light receiver,
a measured waveform forming section for forming a measured waveform representing a configuration of an outer circumferential region of the cutting blade from the amount of light measured at a plurality of rotational angles of the cutting blade,
a comparative waveform forming section for forming a plurality of comparative waveforms representing configurations of the outer circumferential region of the cutting blade, on a basis of amounts of light measured by the measuring unit, wherein the cutting blade is mounted on the spindle with respective desired eccentricities according to each of the plurality of comparative waveforms,
an ideal waveform recognizing section for recognizing a comparative waveform that has the greatest number of waveform regions similar to the measured waveform as an ideal waveform, among the plurality of comparative waveforms formed by the comparative waveform forming section using the respective desired eccentricities that are varied stepwise by the ideal waveform recognizing section,
a difference calculating section for calculating an area of a region where there is a difference between the measured waveform and the ideal waveform that are superposed on each other, and
a determining section for determining that the configuration of the cutting blade is abnormal if the difference exceeds a threshold value.