The invention discloses a free
forging process for a sector plate
forge piece. The free
forging process includes the following steps that G0 is equal to [alpha / 360piR<2>L-1 / 2(R-h1)L+B(H-h1)L]*rho; the fire consumption is calculated, wherein G1 two-fire forming is conducted, and the fire consumption rate is 5%, that is, G1 is equal to G0*0.05; head
cutting is conducted, wherein G2 is equal to 1.8*B2*H*2; the discharging weight is calculated, wherein G is equal to G0+G1+G2; flat square blank forming is conducted through an upper flat anvil and a lower flat anvil, and a sector-shaped groove is machined through a planing
machine; and a forged sector-shaped concave blocking narrow anvil of a blank is drawn out, and the width and the size are adjusted properly to accord with the conditions indicated in a drawing. According to the free
forging process, the requirement for the skill of workers is not high, operation is easy and convenient, and production efficiency is high; the
embryo die forging shape is precise, and size precision is high, so that the number of process accessorial blocks is small, and the allowance for
machining is small; and according to the forged sector-shaped face of the
forge piece, a great number of raw materials are saved, the
machining time is shortened, the requirement for the technological level of the workers is lowered, and the daily output is increased greatly.