In order to prevent eccentric flow caused by longitudinal bending in the forging process, for the billet formed by partial upsetting, the height to diameter ratio of the deformed portion should be H 0 D 0 ≤ 1.4, and the billet for the punching generally is H 0 D 0 ≤ 0.9 − 1.1. In production, the billet with the overall deformation is generally positioned by the contour, while the billet with only the local deformation is positioned by underformed parts. Inappropriate shape and incorrect position of billet will likely make the forging to produce flash on one side while the other side has not been filled, as shown in Figure 6. In the process of the closed-die forging without flash, it plays an important role in the uniformity of the distribution of metal that whether the shape and size ratio of the billet is appropriate and the position of the billet is correct in the die cavity. Stage III is forming vertical flash stage. The deformation process of closed-die forging without flash is shown in Figure 5, which can be divided into three deformation stages. Closed-die forging without flash is more applicable to forgings with the axisymmetric deformation or approximate axisymmetric deformation currently the most widely used is short-axis rotator forgings. Closed-die forging without flash is also known as no flash die forging.
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