Multi-ram die forging process method and die for 40Cr-steel frame type parts

The invention discloses a multi-ram die forging process and a die for 40Cr-steel frame type parts, belongs to the technical field of plastic forming for a metal material, and aims at effectively avoiding the problems in an existing open die forging process and a existing isothermal forging process. The multi-ram die forging process comprises the steps of blanking, heating and multi-ram die forging, wherein, the multi-ram die forging comprises the steps as follows: (1) stocks are heated until the temperature reaches 1000 to 1180 DEG C through intermediate frequency induction; and (2) heated blanks are formed in one step through a multi-ram die forging die. The multi-ram die forging die comprises symmetrical left and right lateral male dies, an upper half male die, a lower half male die, a lateral male die fixing board and a die frame, wherein, the die frame comprises an upper die holder and a lower die holder. The invention has the advantages as follows: the technological process is reasonable, and the processing parameter and the performance are stable; the structure of the die is simple, the die is convenient to manufacture, install and use, and the operation is reliable; the friction resistance between forged pieces and a die cavity can be reduced greatly, the service life of the die is prolonged obviously, the surface quality of the forged pieces can be improved, and the utilization ratio of materials is high; and one-step forming can be achieved, and pre-forging is not required.