For manufacturing robotized systems projection are considered two different types of product groups: screwed join nuts (6 items) and screwed nipples (1 items) with similar design attributes but with different fabrication requirements: material, tolerances, production volume (pcs./year). The technological way followed by these ones, are noted by: C – centering, S – turning, F – threading, G – drilling, R – grinding . As for the determination of confi manufacturing robotized systems guretion, this to stage wants to determine working units for manufacturing of product’s family.
he type and the number of work station (operation-modules) of intelligent manufacturing system it’s realized by mathematical modeling. We consider:
Petri’s nets (RP), fig. 2, are a chart and mathematic model used for representation and control of flow in a production system. They are featured by two types of points, positions transitions. Arches may bind points of different types. Marking vectors are used to describe the status of the system with discrete elements. The use of entities position/transition/marking in the model of Petri’s nets enables the view of dynamic behavior of the system with discrete elements. Within this frame, matters related cu synchronization of the parallel processes may be behavioral modeled. Fabrication scenario, fig. 1: Inputs – parts entering into the system through the input device DI and conveyor C1. The blank, fixed on a blade is picked up by the conveyor 1, transportation system ST and the industrial robots RI1 and RI2, respectively. The parts are transported from WS1 and respectively WS2, to the CON inspection machine by means of conveyors C4, C5, C6, C7. Outputs – the parts successfully inspected come out from the system and are moved in the finished part storehouse DO by the means of the conveyor C7; non-conforming parts are sent back into the system at the working stations for reworking of non-conformity found, by means of the bin C8. In figure 3 is presented the model flexible system of production using the Petri’s nets. Before launching a simulation a simulator suitable to the type of modeled net has to be selected. The next step of simulation is the selection of curves on which the evolutions of marks shall be followed up, then their characteristics, axis of marking, time and chart bound, module occupation diagrams, work stations histogram.