In addition, different forging deformation methods of intermediate input shaft die forgings and different thermo-mechanical conditions applied to the blank will lead to different physical fields and the evolution process of microstructure and properties. Therefore, different forging processes for the same die forging will change its quality.

In addition, the quality of die forgings is also related to forging design and die design. The selection of machining allowance and forging tolerance should be based on reality. The design of forging parting surface, die-forged web, fillet radius, joint skin size and flash structure also conform to reality. In short, every link of die forging production will have a significant impact on the quality of forgings.

The ultrasonic inspection, macroscopic structure inspection, microscopic inspection and residual stress inspection of the intermediate input shaft die forgings should not be ignored.