Shot Peening

Process

The Shot Peening process is the most economical treatment aimed at increasing a mechanical component’s useful life. This is a cold plastic deformation process which introduces residual compressive stresses in the material being processed.

The surface of the component is bombarded by a localized and controlled high-speed shot of rigorously selected microspheres. At surface level the impact of these microspheres generates many small impresses and a plastic deformation of the fibers of which the component is composed by; while in the underlying layer, the material tries to recover its original shape and position. From such reaction a uniform area strongly stressed to compression is generated.

The dimensions of the microspheres and the process criteria are chosen according to the geometry and on the critical nature of the component that has to be treated. Depending on the material to be processed, the spheres can made of carbon steel, glass or ceramic

Fields of application

Shot peening is sector – specific

Fields of application

Shot peening is sector – specific

Fatigue

The Shot Peening process is particulary suitable for increasing the fatigue resistance of the mechanical component, with a potential increase that ranges from 10-15% up to over 50% when further optimization treatments are applied.

When talking about fatigue we are talking about that phenomenon responsible for the majority of mechanical failures in operational phases: regular or random variable loads damage the material until its complete failure.
Fatigue cracks are typically caused by: bending loads, torsion loads, axial loads, contact-fatigue load, corrosion, thermal loads and welds.

Why use the shot peening process?

To increase fatigue resistance
To increase fretting resistance
To prevent intergranular corrosion
To decrease under strain corrosion
To increase galling resistance
To increase pitting resistance
To improve lubrication
Forming and straightening

Processing of surfaces

Improving mechanical component’s surfaces improves its functioning and performance.

Controlled rugosity

This process allows to increase or decrease the rugosity of a given surface according to customer’s needs. In many cases, indeed, a well defined rugosity of a mechanical component is requested: for this purpose I.F.P has developed a very precise treatment that is able to obtain precise and continuously reproducible values.

The controlled rugosity is used for the preparation of surfaces before painting or coating, guaranteeing an excellent degree of adhesion.

Controlled removal

Often the damage on mechanical components is provoked by an uncorrect heat treatment or by unprecise mechanical processing: If this happens on finished and already treated parts, there is no possibility to recover the deformation of the component.

I.F.P offers its clients a precise targeted and effective controlled removal treatment that’s able to remove processing burrs, coatings, oxidation but also to restore requested geometries deformed by previous heat treatments.

Clean peening – surfaces’ decontamination

Metals are chemically reactive materials which makes the decontamination processes of a metal surface very complex when using solvents.

The solvents that are being used, despite having a high-purity degree, may leave traces underneath the treated surface. Therefore the most appropriate cleaning tool should be one that doesn’t chemically react with the component’s material undergoing the process and, at the same time, it should also be able to effectively remove the present contaminants.

Residual stresses control

Residual stresses are generated within the material since the beginning of its solidification due to the presence of unavoidable temperature gradients, changing as a result of mechanical processing and heat treatments.

Residual compression-stresses artificially induced by shot peening bring a considerable benefit in terms of performance, increasing the life of fatigue- resistance of the treated part.

I.F.P on customer’s request carries out residual stress tests using an X-ray diffractometer.