Cold Forging
Process Operations
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1. Forward extrusion reduces slug diameter and increases its length to produce parts such as stepped shafts and cylinders. |
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2. In backward extrusion, the steel flows back and around the descending punch to form cup-shaped pieces. |
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3. Upsetting, or heading, a common technique for making fasteners, gathers steel in the head and other sections along the length of the part. |