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[forging]

The Working principle of ring rolling machine

Ring rolling is a hot forming process that produces seamless rings varying in size from a few inches in diameter, and weighing less than one pound, to over 1500 mm in diameter and face heights approaching 450 mm. The process and equipment are similar in principle to rolling mills used for plate. In both processes, the metal is rolled between two rolls, which move toward each other to form a continuously reducing gap. In ring rolling, the rolls are of different diameters.

The process is: It begins with a hollow circular preform that has been upset and pierced, similar to preforms used for ring forging. The preform is placed over the idler or mandrel roll, which is forced toward the drive roll. The drive roll rotates continuously, reducing the wall thickness, imparting the desired shape to the cross section, and increasing the diameter. Contours may be rolled on either the inside surface, outside surface or both.