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The shape of the die forging is an important basis for formulating a die forging process. Forgings with similar shapes, the die forging process and the die structure used are basically the same. Therefore, the various types of die forgings are classified to facilitate the design of forgings and dies. Commonly used classification methods are divided according to the shape of the forging and the direction of the axis of the billet when forging. Generally, the forgings can be divided into two types. The first type is a round cake type forgings such as a simple round cake forging, a more complex piece and a thin-walled deep hole complex circle. Cake forgings. Class II is a long shaft forging such as a bending axis, a branch bud axis, and a fork type.
Round cake forgings have gears, flanges, cross shafts, universal joints, etc., which are characterized by:
1. The dimension of the main axis of the forging is smaller or close to that of the other two directions.
2. The hammering direction of the main deformation step is parallel to the direction of the main axis.
3, when forging, the metal along the height, width and length of the three-dimensional deformation of the flow, is a volume deformation.
Long-axis forgings include spindles, gear shafts, transmission shafts, locomotive shafts, eccentric shafts, etc.; rods such as cross-sections are square, rectangular, arc-shaped, I-shaped connecting rods and tension bolts, etc., and are characterized by:
1. The size of the main axis of the forging is larger than that of the other two directions.
2. The hammering direction of the main deformation step is perpendicular to the main axis.
3. In the die, the deformation flow in the direction of the length of the deformed metal (main axis) is small and can be regarded as a plane deformation approximately.