Шот пининг и пин форминг

FerroECOBlast предлага превъзходство и в най-претенциозните изисквания касаещи подготовката на повърхнината. 

Add more value to your high-tech products and increase their lifetime, while protecting them against failures such as fatigue, fretting fatigue and stress corrosion cracking with our technology of shot peening.

Our proven shot peening technology guarantees increased fatigue strength up to 800% and the fatigue life up to 1000%.

Shot peening is a cold working process in which the surface of a part is bombarded with small spherical media called shot. Each piece of shot striking the metal acts as a tiny peening hammer imparting a small indentation or dimple on the surface. In order for the dimple to be created, the surface layer of the metal must yield in tension.

Below the surface, the compressed grains try to restore the surface to its original shape producing a hemisphere of cold-worked metal highly stressed in compression. Overlapping dimples develop a uniform layer of residual compressive stress.

It is well known that cracks will not initiate nor propagate in a compressively stressed zone. Because nearly all fatigue and stress corrosion failures originate at or near the surface of a part, compressive stresses induced by shot peening provide significant increases in part life. The magnitude of residual compressive stress produced by shot peening is at least as great as half the tensile strength of the material being peened.

In most modes of long term failure the common denominator is tensile stress. These stresses can result from externally applied loads or be residual stresses from manufacturing processes such as welding, grinding or machining. Tensile stresses attempt to stretch or pull the surface apart and may eventually lead to crack initiation. Because crack growth is slowed significantly in a compressive layer, increasing the depth of this layer increases crack resistance.

Shot peening is the most economical and practical method of ensuring surface residual compressive stresses.

More about shot peening equipment.

Peen forming

Shot peen forming is extremely flexible cold forming process derived from shot peening and enables forming of complex shapes, which using conventional methods would require a lot of machining resources and power consumption. Peen forming is used to form the most complex curvatures of aluminium wing skins in manufacturing of airplanes. Peen forming is also used to form airplane fuselage shells, and tank segments for expendable launch systems for space industry.

Peen forming is often more effective in shaping curvatures rather than rolling, pressing or bending. Also saddle forms can be achieved with peen forming. Since peen forming is performed without the use of dies, material consumption due to circumcision is greatly reduced, and eliminates the high cost of development and manufacturing of dies. 

Peen forming is so flexible it can further modify the shape once it has been made.

More about shot peen forming technology.