A seamless rolled ring forging is created through the process of ring rolling with the use of rolling mills. A circular preform of metal is pierced using the open die forging process to form a hollow shape that looks like a donut. Before placing the donut over the mandrel roll or the idler roll, the donut is heated above the recrystallization temperature. Once it is placed over the idler roll, the idler roll moves toward a continuously rotating drive roll to reduce the thickness of the ring’s walls while increasing its diameter. With the use of rolling mills that come in various sizes, seamless forged rings that have outside diameters that range from a few inches to more than 300 inches can be produced. It’s also possible to create forged rings that could weigh from a pound up to over 300,000 pounds.
Casting and rolled and welded plates are both metalworking processes that allow you to produce rolled rings. Cast rings are prone to inclusion defects that need extra machining as well as weld repair. After the fabricated ring goes through extensive welding, the integrity of its part is reduced, its corrosion resistance is jeopardized, and its shape becomes distorted. On the other hand, with the forging process, the directional grain flow causes the forging’s overall strength to be increased. Plus, the maintenance of the part’s corrosion resistance and shape is ensured because of the absence of welding.
The utilization of the rolled ring forging process will definitely reduce the cost that’s typically seen with plate burnouts and other process options. If you need more information about seamless rolled ring forging, get in touch with Ferralloy, Inc. today.
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