Abstract
Different from the conventional ring rolling mill, the combined ring rolling mill has not only one main roll and one mandrel to enlarge the ring blank, but also two assistant rolls to deform the ring blank with the main roll continuous feeding. The novel ring rolling process can have three working modes: 1) conventional ring rolling; 2) cross rolling with three rolls surrounding the ring blank; 3) conventional ring rolling with cross rolling. Moreover, the new ring rolling process allows the transferring from one working mode to another. The process and the mill provide more flexibility for manufacturing different ring products. The stiffness condition at different working modes and the smoothly transferring conditions are first studied carefully. Then the combined ring rolling model for deep groove ring is established and evaluated.
Highlights
Ring rolling is an incremental bulk metal forming process to manufacture seamless rings with various diameters and cross sections
The novel ring rolling process can have three working modes: 1) conventional ring rolling; 2) cross rolling with three rolls surrounding the ring blank; 3) conventional ring rolling with cross rolling
The temperature of ring blank often drops below the austenitizing temperature, and the ring blank is not suitable for conventional ring rolling process and need to be heated again
Summary
Ring rolling is an incremental bulk metal forming process to manufacture seamless rings with various diameters and cross sections. The combined ring rolling process is proposed to take the advantages of the ring rolling and cross rolling with three rollers, to shorten the manufacturing chain for the profile ring products. The stiffness condition is proposed to estimate the limit parameters for the combined ring rolling process
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