Dynamic Planning and Multicriteria Scheduling of Turned Parts' Production

In traditional approach, planning and scheduling are two separate and successive operations. The process planning phase is mostly about the physical aspect of planning, where a product range, production quantities, machines, tools, material and accessories are selected. The emphasis in the second, scheduling phase, is on the time aspect. The plan is the basis to determine the sequence of operations across available machines in a way that provides maximum machines utilisation and timely manufacturing. Differences between planning and scheduling criteria often lead to conflict situations or even opposition between respective goals. Master production schedule (MPS) and capacity requirement planning (CRP) in the environment of manufacturing resources planning (MRPII) are the most frequently applied traditional methods in practice. This system is characterised by a hierarchical approach from the top to the bottom. Goals and restrictions at the lower level are determined by the results at the higher level. Such planning method rarely takes account of the scheduling problem. Separate treatment of planning and scheduling often results in plans having to be manually modified. It leads to significant rearrangement costs and supply delays. Nowadays, such planning does not provide efficient business operations as customers and the market require flexibility and quick response. A solution for such problems is the integration of planning and scheduling processes. The article presents a solution on the case example of planning the production of turned parts. Presented is a dynamic planning model and its