Homberg W., Djakow E.
THE INVESTIGATION OF A PNEUMOMECHANICAL HIGH SPEED FORMING PROCESS
In the area of metal forming technology, the pneumomechanical high-speed-forming process is a promising approach for manufacturing of thin walled workpieces made of high strength materials. This process uses a pneumatic accelerated plunger that dives into a working media filled pressure chamber for the generation of a short pressure pulse. This pulse can be influenced, on the one hand, by evacuating the acceleration tube and as a consequence higher plunger energy and on the other hand by varying process parameters such as working media characteristics as e.g. density, oxygen content and type as well as the plunger geometry. The influence of these parameters on the process is subject of intense research work at the Chair of Forming and Machining Technology (LUF) at University of Paderborn. Recent results show that pneumomechanical and electrohydraulic forming allows for manufacturing of complex geometrical details in aluminum alloys that cannot be produced by conventional stamping processes. Due to the high homogeneity of the pressure distribution in the pressure chamber, it is possible to achieve high quality workpieces with low dimensional deviations. This paper presents the results of basic research conducted on pneumomechanical high-speed-forming as well as a comparison with electrohydraulic forming.
Keywords: Pneumomechanical forming, Electrohydraulic forming, High speed hydroforming