Manufacturing method of grinder flange by bending, forming and splice welding n steel plate bar stock

The invention discloses a manufacturing method of a grinder flange by bending, forming and splice welding n steel plate bar stock, comprising the following steps: dividing the grinder flange into n fan-shaped segments if the diameter of the grinder flange is D, the width is K, and the thickness is H, wherein n is more than or equal to 2, each fan-shaped segment arc length L is equal to Pi D/n; taking steel plates with equal Hs; cutting the steel plates to be the steel plate bar stock the length of which is that L1= L+ allowance according to K; preheating the n steel plate bar stock to 300-350 DEG C; (1) placing any end of the steel plate bar stock on a limit supporting; bending and forming the end by a fan-shaped hammer on a pressure machine; (2) moving any end of the steel plate bar stock onto two supporting rollers the radiuses of curvature of which are adjusted and the limit supporting to be bent and formed; (3) moving the steel plate bar stock material with the delivery amount to be 300-450mm by taking th