Influence of the process parameters on the multi-directional forging operation of a two cylinder crankshaft

摘要

Precision forging is defined as a flashless near net shape forging technique. Its deployment permits the procurance of quality grades in the tolerance class between IT 8 and IT 10. By use of the forging heat, the flashless precision forging provides an integrated heat treatment. This is possible, because an additional process step, the clipping, can be entirely omitted. Subsequent to forging and heat treatment, there is only a final fine machining of the functional surface with very little chip volume required. In the collaborative research project SFB 489 a two-cylinder-crankshaft was selected as an example for complex flat long pieces with a characteristic mass distribution along the longitudinal axis. The continuative development contemplates the thermal and mechanical tool tensions, which are just as complex as the crankshaft itself. Furthermore, a parameter study on a multi-directional forging tool is made.