The body of knowledge of the intelligent control system e-MindMachine of the multi-operation machine contains each tool condition data including its remaining life time. This is required to obtain conclusions on the possibility of the planned machining pass, the wear size value, the necessity to change cutting conditions during the operation in the fuzzy boundary strip area, etc. In addition to the previously described methods of assessing the initial and final values of the boundary strip time as an uncertainty state area, a visual method using a modi-fication of Shewhart control charts is offered. The adaptive control charts allow tracking the tool wear progress warning of deviations from the requirements to the process. A program sheet with the appropriate control charts and examples of their usage for the assessing the tool state and forecasting the bound-ary strip parameters is presented. The dependences of estima-tions of the expectation of the wear size and scattering within the linear tool wear zone, appropriate velocity functions and a posteriori values for the future operation in the boundary strip area are described. On this basis, the timing estimation of the boundary strip head and end is predicted. The processing of the statistical control charts is performed by the MATLABStatis-ticstoolbox application package.
multioperational machine, tool state monitoring, fuzzy boundary of tool wear size, Shewhart control charts.
Основной задачей развития системы мониторинга и управления состоянием инструмента на стан-ках является повышение производительности и экономической эффективности за счет увеличения сроков службы ин-струмента, минимизации простоев станков, сокращения и предотвращения повреждений обрабатываемых деталей. В функции системы мониторинга инструмента входят сбор, хранение и анализ некоторого количества явных или косвенных параметров описания инструмента, находящегося на станке, для суждения о его стойкости, состоянии и изме-нениях в процессе обработки. В частности, внимание данной проблеме было уделено в работах [1–3]. Полученные оценки состояния и периода стойкости служат основой для принятия решений по управлению функциями его исполь-зования или замены.
Понятие нечеткой полосы стойкости инструмента введено в связи с необходимостью автоматизированной оценки работоспособности режущего инструмента и управления его состоянием при работе многооперационных станков с ЧПУ в режиме «безлюдной технологии» [4–5]. Параметры граничной стойкости — это оценочные значения в периоде стойкости на некотором интервале времени, пути или объема удаленного материала при резании до предела размерного или начала катастрофического износа инструмента.
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