Preview 2025 – Vibro Technology SHOT PEENING – VSP
To understand the Vibro Shot Peening process, first we need to take a step back to talk about Shot Peening.
Shot Peening is in fact the precursor of the most common processes intended to increase the compression or surface tension of a metal component. This is generally done by means of wheel or compressed air blasting machines under direct pressure. These systems shoot metal grit (usually stainless steel spheroids) onto the surfaces of the components to be involved. The Shot Peening process is in fact a form of bombardment of a surface with spheroids that determines a series of imprints on the surface called „dimples“ capable of generating taut surfaces with relative compressions. This type of application is ideal for reinforcing structures such as metal beams, bridge components or pylons for the electrification of railway lines, and all those components where the increase in surface roughness does not lead to negative effects. The process that Rollwasch® has identified with the acronym VSP is, as we will see, able to achieve similar levels of tension and compression, without however generating such high surface roughness and, in many applications, dangerous for the use for which the components are intended.
Again to understand the Vibro Shot Peening process, let’s take a closer look at the traditional Shot Peening process.
The Shot Peening with spherical metal shot has been analyzed far and wide, so we can say that it is absolutely predictable that, once a value of 0.4 μm RA has been reached on a surface, for example, of a turbine blade for energy, after the Shot Peening operation the surface rises to 1.6 μm RA (a value often unacceptable for the functions to which the turbine will be subjected).
With the Vibro Shot Peening process, however, things change. In fact, starting from a low initial roughness, excellent levels of compression can be achieved, containing the variation in roughness around the same initial value or a few decimals more.
It is no coincidence that the VSP process (also called Vibro Shot Peening) has been the subject of numerous scientific comparisons at the international level*.
* Goetz Feldmann et al. / Procedia CIRP 13 ( 2014 ) 423 – 428
Web Link: https://www.researchgate.net/publication/275068480_Application_of_
Vibropeening_on_Aero_-_Engine_Component
