Forging can be divided into manual forging and die forging.

Die forging refers to heating the metal first to become a liquid or softened state. Then put it into the mold and form it in one go by closing the upper and lower molds of the mold, sometimes multiple times.

The difference between it and casting is that casting pours heated molten metal directly into the model, while die forging also requires the closing of the upper and lower dies, and is subject to extrusion force during the forming process. , so the structure and mechanical properties of die forgings are better than those of castings.

In addition, if the shapes are complex and are produced in large quantities, die forging is generally used instead of manual forging.