Combined forging method for 300m steel rocker arm forging

Abstract

The invention provides a combined forging method for a 300 M steel rocker arm forge piece. The method comprises the following steps that 1, a blank is made, specifically, a rod material is forged intoa specified shape; 2, the original jaw ends of the original dies at the two ends are changed into large-scale cavity structures for containing the blank, the forge piece communicates with the middlesection, the disc end on one side of the forge piece is subjected to die forging firstly, and the fork end on the other side of the forge piece is subjected to die forging after the blank is turned around, 3, the middle section is retained not to be subjected to die forging and forming, so that the middle section is kept at a blank making shape; 4, the middle retention section is forged into the required diameter through a free forging method, so that the overall length size of the forge piece is controlled and adjusted; and 5, the straightness of the forge piece is guaranteed by utilizing contact of the front end, the middle end and the rear end through an integral shape correction method. According to the combined forging method for the 300 M steel rocker arm forge piece, the stress areaof the die forging is reduced, the tonnage of equipment is reduced, and the forge piece forming is guaranteed in advance through double-head die forging; the middle part is forged through a free forging method, so that the total length of the forge piece is ensured; and the straightness of the forge piece is ensured by adopting local integral shape correction, and the die structure ensures the reliability of the forge piece forming.

Description

technical field [0001] The invention belongs to the field of metal pressure processing and relates to a combined forging method for 300M steel rocker arm forgings. [0002] technical background [0003] At present, the forging method of double-head die forging at home and abroad is to locate the boss in the middle, that is, to forge one end first and leave a boss in the middle when forging, and forge the other end with the boss as the positioning point when forging the other end. On one end, this method is difficult to guarantee the overall length accuracy of the forging because the transition zone of the boss will also participate in the deformation after forging. The two ends of the 300M steel rocker forging to be forged are asymmetrical, with a total length of 1282 mm. The overall forming requires 14 tons of die forging equipment. The forming force requires large tonnage equipment, and the forming rate of the forging is low. Contents of the invention [0004] In order t...

AI Technical Summary

Problems solved by technology

[0003] At present, the forging method of double-head die forging at home and abroad is to locate the boss in the middle, that is, to forge one end first and leave a boss in the middle when forging, and forge the other end with the boss as the positioning point when forging the other end. One end, this method is difficult to guarantee the overall length accuracy of the forging because the transition zone of the boss will also participate in the deformation after forging the other end

The two ends of the 300M steel rocker forging to be forged are asymmetrical, with a total length of 1282mm. The overall forming requires 14 tons of die forging equipment. The forming force requires large tonnage equipment, and the forming rate of the forging is low.

Images