Answer
Edge-winding is a process where flat wire is coiled on its edge to create the ring. Unlike stamping, which punches a ring out of a sheet and creates significant 'scrap' and transverse grain flow, edge-winding results in a circular grain flow that follows the circumference of the ring. This metallurgical orientation significantly improves the toughness and fatigue resistance of the ring. Furthermore, edge-winding allows for 'No-Tooling-Cost' customization of diameters and thicknesses, as the coiling machines are CNC-controlled. Stamped rings also have a 'burr' side and a 'break' side due to the die action, whereas edge-wound rings have a smooth, rolled surface on all sides, reducing the risk of stress risers and improving the fit in precision grooves.
