Management system, management device, spindle failure detection method using management device, and non-transitory computer readable medium encoded with computer program

A management system comprising a network, a plurality of manufacturing cells connected to the network, and a management device that is connected to the network and manages the plurality of manufacturing cells,

• wherein each of the manufacturing cell includes:
• a machine tool of a same type as a machine tool in another of the manufacturing cells;
• and
• a control device that controls the machine tool, analyzes a vibration state of a spindle positioning shaft of the machine tool, and sends an analysis result via the network,
• wherein the control device, in a case of the machine tool being in a non-processing state, sends via the network as the analysis result only frequency spectral intensities having an intensity of at least a predetermined value, among frequency spectral intensities obtained by conducting Fourier transformation on a feedback signal of a servomotor for driving the spindle positioning shaft when rotating the spindle of the machine tool at the same revolution speed as a machine tool in another of the manufacturing cells, and
• wherein the management device includes:
• a communication unit that receives the analysis result sent by the control device;
• and
• a detection unit that compares the analysis results thus received, and compares vibration states among each of the machine tools of the plurality of manufacturing cells, so as to detect spindle failure of a machine tool having a frequency spectral intensity differing from another of the machine tools, and
• wherein the communication unit, in a case of the detection unit detecting the spindle failure, sends a failure signal via the network.