Coroning is mainly designed for high-volume and mass production of internal spur and helical gears with interfering geometry, a module range of 0.8 to 3.5 mm, a tip diameter of max. 250 mm and a face width of up to 50 mm. Coroned gears offer the advantage of functional flank topology and optimum gear noise characteristics. There is no risk of thermal material damage and due to increased residual compressive stresses the inclination of wear decreases.
Coroning causes a material abrasion by means of the electronically coupled relative movement of gear and gear shaped tool with a cross axis engagement of tool and workpiece. The generating coupling of these directly driven CNC axes reduces geometrical gear errors from the pre-machining phase. Besides, the process and the machine offer short machining times, constant machining quality plus short set-up times. Only non-dressable KAPP tools are used for the coroning process. For the machining of internal gears, external geared tools are applied.