Seamless Rolled Ring Forging Process Operations


1. The ring rolling process typically begins with upsetting of the starting stock on flat dies at its plastic deformation temperature - in the case of grade 1020 steel, approximately 2200 degrees Fahrenheit. 2. Piercing involves forcing a punch into the hot upset stock causing metal to be displaced radially, as shown by the illustration.
3. A subsequent operation, shearing, serves to remove the small punchout ... 4. ...producing a completed hole through the stock, which is now ready for the ring rolling operation itself. At this point the stock is called a preform.
5. The doughnut-shaped preform is slipped over the ID roll shown here from an "above" view. 6. A side view of the ring mill and preform workpiece, which squeezes it against the OD roll which imparts rotary action...
7. ...resulting in a thinning of the section and correspondence increase in the diameter of the ring. Once off the ring mill, the ring is then ready for secondary operations such as close tolerance sizing, parting, heat treatment and test/inspection.