Deep Rolling

Deep rolling is the most sufficient mechanical process to improve the fatigue strength of dynamically loaded components. It eliminates or at least reduces fatigue especially on notches like fillets and shoulders which can lead to fatigue cracks. The deep rolling process works simi-larly to roller burnishing but the task is different. To guaranty equal component quality, all process parameters, but especially the burnish-ing force must be controlled during the process.

fig.8

The compressive stress, generated in the surface layer during the roll-ing process remains to a high extend after the rolling process is finished. The compressive stresses in axial direction are most important for the improved fatigue strength acc. to fig. 8.
The deep rolling is based on 3 physical effects:

-	Implementation of residual compressive stress
-	Increase of material strength in the surface layery
-	Smoothing of surface, means elimination of micro-notches

Furthermore, deep rolling provides following significant advantages compared to other processes:

-	Deeper penetration
-	Shallow gradient of the compressive stress characteristic
-	Cost effective by completion in one setting after the cutting process
-	Easily reproducible.

You can find a collection of application examples on the following pages: General machine construction, vehicle construction, power plants, engines, aircraft

	General machine construction
	vehicle construction
	power plants
	engines
	aircraft