Abstract: A new finish forging die structure of crankshaft is given. The three important factors of resistance wall, including height, clearance, gradient influencing on forming load of finish forging are studied. Furthermore, FEM software Deform3D is applied to simulate the crankshaft finish forming process, and the result is displayed in the form of graph through least square method, which provides a reference for other crankshaft’s forging and can be used to guide producing directly. As the graph shows, the maximum forming load of finish forging raises while the resistance wall height increases. For the con-sideration of both forming quality of crankshaft and die life into account, the value sphere of resistance wall height is [10, 30] mm; The maximum forming load of finish forging decreases, while the resistance wall clearance increases, and the rational value sphere of resistance wall clearance is [2.0, 3.5] mm; The maximum forming load of finish forging raises, while the re-sistance wall gradient increases, but at the same time, die wear can be controlled. So the rational value sphere of resistance wall gradient is [0°, 20°]. In the end, the rationality and feasi-bility of the above conclusions are examined by experiment.

Key words: Crankshaft, Die life, Forming load, Parameters of resistance wall