Experiences with inline feedback control and data acquisition in deep drawing

Abstract

The increasing complexity of parts produced in deep drawing needs an enhanced process design, which results in different methods of the visualization of process windows. With these visualization methods, the process is usually designed to reach wide process window. Due to changing friction through rising temperatures in the tools, tool wear or batch to batch variations in the material, the process window is reduced again. Therefore new methods are needed to keep the process inside the process window. The paper deals with a possible approach of keeping the process inside these windows. The proposed approach tries to unite the measurement of possible influence factors like the batch to batch variation of material properties with a feedback control to eliminate the non-measurable influences. The measurement of the material properties is done by a measurement system based on eddy-currents, while the needed measurement for a feedback control is done with an optical system. Finally the paper will show the experiences with the proposed system, as well as it will show the prerequisites for such a system.