Demands for increased production rates and for the use of materials with extreme properties lead to a need for further investigation and more detailed modelling of the winding process. Replacement of analogue controllers by digital equipment involves significant changes in the start-up procedures and offers the possibility of rapid adaptation to different materials. Furthermore, the finally selected parameters are numerically known and can be reproduced at other machines. Instead of working with one central process computer a master-slave system with one processor for each drive appears as a more flexible and faster control strategy. In this paper the equation of the winding process of thin material is derived, and the application is considered for two typical cases: rewinding based on a model without control loops, and unwinding with an adaptive speed control and a storage loop for winding force control. In the first case a given winding force characteristic as a function of the radius of the coil and the tape velocity is realized. Logically such characteristics depend on the material and most producers develop their own philosophy in this field. An implementation is briefly discussed.
展开▼
