Bulk metal forming of metallic microparts at elevated temperature
- Prof. Dr.-Ing. Dr.-Ing. E.h. mult. Dr.h.c. M. Geiger
- Prof. Dr.-Ing. F. Vollertsen, Universität Bremen
When scaling down the dimensions of work pieces grain size of the material to be formed usually remains constant. As a result the forming zone in micro forming only consists of a view grains yielding to a clear irregularity of the forming behavior with effects to the process control, process stability and work piece quality. Due to this fact, in cold micro forming the material behavior possesses the character of an inhomogeneous continuum.
The focus of this work is placed to the analysis of the influence caused by an increased process temperature in micro forming onto the forming behavior. The temperature influence is investigated using different key variables which are important for the practical application, as there are forming force, material flow, hardness and deviation in shape. The investigations have been carried out at two different materials, CuZn15 and X4CrNi18-10. First of all the experiments were performed with the basic test cylinder up-setting. In the next step the experiences have been transferred to the processes cup backward extrusion and lateral extrusion. The gained results will support to enlarge the process comprehension for micro forming processes and, thus, to facilitate micro forming technology as an additional production technology to be applied in industry.