Crankshaft deep rolling

From Wikipedia, the free encyclopedia

Deep rolling is a method of cold work deformation and burnishing of internal combustion engine crankshaft journal fillets to increase durability. Compressive residual stresses can be measured below the surface of a deep rolled fillet. Other types of fillets on shafts or tubes can benefit from this method too. Typically the crankshaft is machined with under-cut fillets as opposed to tangential radiused for ease of manufacture, although all types can be deep rolled. Most automakers are currently utilizing this technology. The Hegenscheidt-MFD Corporation and ICM (teamed with Lonero Tooling) are the only two Major competitors in this application in North America.