Abstract: The stress distribution of the blank center is analyzed by finite-element simulating new FM forging. There is a critical value of tool width ratio when the axial tense stress turns to compressive stress under given reduction ratio and blank width ratio; likewise, there is a critical value of blank width ratio when the transverse tense stress turns to compressive stress under given reduction ratio and tool width ratio. The rational processing parameters of tool width ratio, blank width ratio and reduction ratio must match. The conclusion of numerical analysis is the precise and refined processing parameter of new FM.

Key words: Critical tool width ratio Critical blank width ratio, Forging process, New FM