Transmission shaft forging forming process and forging die

Abstract

The invention discloses a transmission shaft forging forming process. A transmission shaft forging is formed by connecting a fork head and a rod part. During forging forming, an upper die and a lowerdie are adopted for vertical forging. A parting surface of the transmission shaft forging is a curve designed according to the shape of the fork head and can divide the fork head into an upper portionand a lower portion. The invention further provides a transmission shaft forging die. The transmission shaft forging die comprises the upper die and the lower die. A cavity matched with the outer surface of the transmission shaft fork head in shape is formed in a die surface of the lower die. A through hole is downwards formed in the center of the bottom of the cavity. A punch protruding downwards is arranged on a die surface of the upper die. The structure of the punch is matched with the shape of the inner surface of the transmission shaft fork head. The portions, on the left side and rightside of the punch, of the die surface of the upper die are each provided with a groove. The grooves in the left side and the right side are symmetrical and matched with the cavity of the lower die insize. In this way, an upper prong of the fork head is partially arranged on the upper die, and the lower portion of the fork head and the rod part are arranged on the lower die.

Description

technical field [0001] The invention relates to the technical field of forging, in particular to a forming process for a transmission shaft forging and a transmission shaft forging die. Background technique [0002] figure 1 The transmission shaft shown is an important security part on the vehicle, and it is formed by connecting the fork head 1 and the rod part 2. Its function is to transmit the rotational torque of the engine to each component, and it itself bears a huge transmission force during the transmission process. And alternating torque, so the overall mechanical performance requirements are high. The traditional forging method of the drive shaft: 1) The process is: blanking - heating - pulling out the long rod part - forging forming - trimming - heat treatment, the billet is made of large-size bar material heated and then drawn out and rolled thin rod part; 2) Design the parting surface of the forging to be an axial straight line (see figure 2 The A-A line), th...

AI Technical Summary

Problems solved by technology

The above-mentioned forging method has the following disadvantages: ① The projected area of ​​the forging in the parting direction doubles, and the equipment required for forming is large in tonnage and consumes a lot of energy; ② It consumes a lot of materials, especially at the opening of the fork.

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