User:Shininghelmet

Ring Rolling is... explanation of process here. This should include an overview of applications

In Ring Rolling, a thick ring is expanded into a large-diameter thinner one. The ring is placed between two sets of rolls, one of which is driven while the other is idle. Its thickness is reduced by bringing the rolls closer together as they rotate. Since the volume of the ring material remains constant during plastic deformation (volume constancy), the reduction in thickness is compensated by an increase in its diameter. Depending on its size, the ring shaped blank may be produced by such means as cutting from a plate, piercing, or cutting a thick walled cylinder. Various shapes can be ring rolled using shaped rolls.

Typical applications of ring rolling are large rings for rockets and turbines, jet engine cases, gearwheel rims, ball bearings and roller bearing races, flanges and reinforcing rings for pipes. The process can be carried out at room or at an elevated temperature, depending on the size (which can be up to 3m in diameter), strength and ductility of the worpiece material. Compared to other manufacturing processes capable of producing the same part, the advantages of ring rolling are short production times, material savings, close dimensional tolerances and favourable grain flow in the product, thus enhancing its strength in the desired direction. The design of the profile rolls requires considerable experience. Analytical techniques are being developed to rely less on established practice and help minimise defects in rolled products.

History
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Mechanics of the Process
Mechanics of the process here

State of the Art
State of the Art here