Press release 6371e Deep rolling with the plunge in and feed process From the 16. until 20. September 2002, ECOROLL AG Werkzeugtechnik presented. an information stand at the International Shot Peening Conference ICSP 8 in Garmisch-Partenkirchen, Germany. This important conference was opened for the first time in this year for alternative processes of the mechanical fatigue strength enhancement. Different university institutes informed about researches, comparing deep rolling with other processes in altogether nine speeches. The known preferences of deep rolling were confirmed on that occasion: large penetration depths simple reproducibility high increase of low cycle fatigue and high cycle fatigue resistance distinctive heat stability of the residual compressive stresses applicable with high strength steels, titanium alloys and magnesium alloys The enclosed lecture 6090e was distributed as poster lecture to numerous interested conferees. The lecture is attached as PDF file download for you. We give you a short summary to your fast information subsequently: Deep rolling with the plunge in and feed process Deep rolling is an extraordinarily effective process for fatigue strength enhancement through the co-action of 3 physical effects (residual compressive stress, local work hardening and burnishing of the surface). The application on standard machine tools in one setting after the cutting process leads to high economic viability. Small fillet radii are done with the plunge in process. Larger radii as well as free form surfaces are deep rolled in the feed process. The control of the rolling force is of crucial meaning for both processes. The rolling force must build slowly on the beginning of the treatment and must be relieved slowly at the end of the treatment. This securely avoids sudden stress transitions and so called stress notches. Control and supervision of the rolling force additionally important to the assurance of a constant quality during the process. With mechanical ECOROLL tools, the control of the spring deflection stands for this while the liquid pressure easily controls the force on hydrostatic deep rolling tools. Deep rolling forms the top layer necessarily to generate the desired effects. This may lead to form alterations of the component which should be considered before process implementation. The universal employable hydrostatic tool "ballpoint®" is applicable also on free form surfaces. Not only rotation-symmetrical components but also free formed can be deep rolled in the future. Application examples from the aircraft industry, vehicle technology as well as the general mechanical engineering arrange an overview over the application spectrum of both variations of the process.
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