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Abstract.A frequently problem found in case of serial production is the balancing of flow lines. This paper shows how using modelling and simulation procedures can put in evidence the bottleneck in the manufacturing flow. These situations occur to the case where the corresponding times of the technological operations differ very much. Using the program TECNOMATIX PLANT SIMULATION can be highlighted those dysfunctions that may appear during of the manufacturing system operation. It is also possible to identify the solutions to allow equilibration of the lines of the manufacturing process. The program TECNOMATIX PLANT SIMULATION offers a variety of information useful for/in the decision makers in the management of the manufacturing process.

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The paper is a partial synthesis of the work that a team within the Faculty of Managerial and Technological Engineering has in the field of modeling and simulation of systems with Petri nets. The paper deals with three issues. The first part is Modeling and simulation of manufacturing systems with timed Petri nets. The first part presents the way in which the performances of some manufacturing systems are evaluated using timed Petri nets. The first example is a manufacturing system specific to the textile industry. The system has three production lines. In this case, the modeling with timed Petri nets allows the analysis of the operation of the flow lines and highlights the bottleneck. Another modeled manufacturing system is specific to a series production, more precisely it refers to the manufacture of gas cookers within a company from Oradea. The model with Petri nets also describes the supply sequences of the stocks of parts and subassemblies. The next modeled system is an automated manufacturing system for the packaging of detergents. The complexity of the Detergent Packing System and the high level of automation, require the use of efficient modeling and simulation methods to verify the validity of the solutions adopted. In this chapter is present the model of a robotic welding cell. The second part of the paper, the transition from timed Petri nets to hierarchical colored Petri nets, shows how Petri nets were developed for a robotic cell for metallographic analysis. The third part is dedicated to modeling with colored Petri nets timed with complex colors of the flexible manufacturing cell A007 within the Department of Industrial Engineering.