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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
[edit]History here
Mechanics of the Process
[edit]Mechanics of the process here
State of the Art=
[edit]State of the Art here
External Links
[edit]1. J.M. Allwood, A.E. Tekkaya and T.F. Stanistreet, The development of ring rolling technology, Steel Res. 76 (2005) (2/3), pp. 111–120
2. J.M. Allwood, A.E. Tekkaya and T.F. Stanistreet, The development of ring rolling technology—Part 2: Investigation of process behaviour and production equipment, Steel Res. 76 (2005) (7), pp. 491–507.
Rolling is a fabricating process in which the metal, plastic, paper, glass, etc. is passed through a pair (or pairs) of rolls. There are two types of rolling process, flat and profile rolling. In flat rolling the final shape of the product is either classed as sheet (typically thickness less than 3 mm, also called "strip") or plate (typically thickness more than 3 mm). In profile rolling, the final product may be a round rod or other shaped bar such as a structural section (beam, channel, joist etc). Rolling is also classified according to the temperature of the metal rolled. If the temperature of the metal is above its recrystallization temperature then the process is termed as hot rolling, If the temperature of metal is below its recrystallization temperature the process is termed as cold rolling. Other processes also termed as 'hot bending' are induction bending, whereby the section is heated in small sections, and dragged into a required radius.
Heavy plate tends to be formed using a press process, and is termed forming, rather than rolling.
See also
[edit]External links
[edit]
{{Ring Rolling - Metal forming}}