FORGING METHOD OF CUP-SHAPED PRODUCT

摘要

PURPOSE: To reduce the size of equipment, to execute the working at the high speed and to improve the dimensional precision of a side wall thickness by simultaneously enabling the reduction of a forming load and the reduction of a side directional load acted to a press without increasing the inclined angle of an upper die of the rotary forging press. CONSTITUTION: This rotary forging method of a cup-shaped product is constituted by setting the forming die so that the valueδ/d of an upper die rotating eccentric ratio showing the positional relation between the upper die rotating axis and a lower die center axis becomes 0.01-0.2. Wherein,δis shift ratio of the intersection between the upper surface of the material and the rotary axis of the upper die from the lower die center axis in the upper die rolling reduction lower surface direction and (d) is the inner diameter of the cup-shaped product.