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

Abstract

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.

Description

technical field [0001] The invention relates to a die forging process and a mold for mechanical parts, in particular to a multi-directional die forging production process and a die for producing 40Cr steel machine body seat parts, and belongs to the technical field of plastic forming of metal materials. Background technique [0002] 40Cr steel is a low hardenability quenched and tempered steel, and it is also the most widely used alloy quenched and tempered steel in China, but the machining performance of 40Cr steel is not very good. At present, the domestic military industry system for 40Cr steel casing body parts, the traditional method is to adopt the open die forging process of die forging hammer, and the process flow is blanking→heating→forging→trimming. The main problems in the process are that the flash is too thick, the metal loss is large, the tolerance of the forging is large, the subsequent machining allowance is large, and the utilization rate of the material is...

AI Technical Summary

Problems solved by technology

Jia Jianlei, Li Ping, Xue Kemin, etc. "Hot Extrusion Process Analysis and Die Design of Body Seat" (see Metal Processing, 2009 (19), pp. 60-61) proposed the technology of processing 30CrMnMoTiA body seat forgings by hot extrusion process Plan, designed the process plan including billet making, flattening and hot extrusion forming, and the hot extrusion die with divisible die structure, and determined the process plan of one mold with two parts through force analysis; its advantage is that it solves the problem of partial load It also reduces the man-hours of subsequent machining, improves the utilization rate of materials, and reduces the production cost. However, because the billet still needs to be flattened first, it cannot be formed in one step, so the productivity still needs to be improved.

Xia Juchen, Hu Guoan, etc. have studied the multi-directional die forging die and multi-directional die forging process of 7A04 aluminum alloy casing parts (see Chinese patent documents CN 101214526 and CN 201217051Y), etc., but no one has adopted multi-directional die forging Research on Multidirectional Die Forging of 40Cr Steel Airframe Seats

Images