Tool breakdown detecting system
AssigneeFujitsu Fanuc Limited
InventorsToshio Sata, Katsumori Matsushima
Life of this patent
Estimating the term…
Abstract
A tool breakdown detecting system having at least one predicted standard pattern of change in the cutting resistance of a tool corresponding to a possible breakdown is prestored in a memory and compared with an actual change pattern of the cutting resistance of the tool monitored during working. When a coincidence is found between the prestored change pattern and the actual change pattern of the tool this indicates a breakdown of tool an alarm signal is generated. The alarm signal can activate a visual or audible alarm as well as regulate the further movement of the tool.
Claims21
A tool breakdown detecting system comprising:
- memory means for storing at least one predetermined change pattern of the cutting resistance of a tool corresponding to a tool breakdown condition during working;
- means for detecting the actual cutting resistance of the tool during working and forming a change pattern of the actual cutting resistance of the tool;
- and
- comparing means for comparing the predetermined change pattern stored in the memory means with the actual change pattern of the cutting resistance of the tool during working, wherein coincidence of the two change patterns thus compared indicates a tool breakdown condition.
A system for automatically detecting a breakdown of a tool during working comprising:
- means for detecting cutting resistance of the tool during working;
- means operatively connected to the detecting means for sampling the cutting resistance detected by the detecting means;
- means operatively connected to the sampling means for storing sampled values obtained by the sampling means;
- arithmetic means operatively connected to the storing means for calculating a difference between the sampled values stored in the storing means, the arithmetic means further comparing the difference calculated between the sampled values to a preset value and coding the difference between the sampled values on the basis of the compared preset value;
- first memory means operatively connected to the arithmetic means for storing a progression of figures coded by the arithmetic means representing the actual change pattern of the tool;
- second memory means for storing a progression of figures coded to represent at least one predetermined standard change pattern associated with a breakdown condition in the tool;
- and
- comparing means operatively connected to the first and second memory means for comparing the actual change pattern with the at least one predetermined standard change pattern, the comparing means having means for comparing the progressions of coded figures stored in the first and second memory means with each other and means for generating a tool breakdown signal when the compared progressions of figures coincide with each other.
A system for automatically detecting a breakdown of a tool during working comprising:
- memory means for storing at least one predetermined change pattern of cutting resistance of the tool, with the change pattern corresponding to a tool breakdown condition during working;
- means for detecting actual cutting resistance of the tool during working;
- means for forming a change pattern of the actual cutting resistance of the tool detected by the detecting means;
- and
- comparing means for comparing the at least one predetermined change pattern stored in the memory means with the acutal cutting resistance change pattern formed by the forming means, wherein coincidence of the two change patterns compared by the comparing means indicates a tool breakdown condition.
Dependencies are inferred from the claim text.