Abstract: Only when the blank width ratio is confined, can no crosswise tension stress forging be realized, regardless of flat platen stretching or the new FM forging method. It is unable to control the blank width ratio for a broad plate when it is compressed to take shape finally. Only when the boundary condition is changed, can it be realized that there is no action of the crosswise tension stress in a broad plate forging when it is compressed to form finally. In this paper, a new sort of tool-the cone platen is proposed, which can achieve the forging of no crosswise tension stress, without the blank width ratio to be controlled.

Key words: Cone platen, Forging, No crosswise tension stress