Controlled shot peening

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Shot peening
Controlled shot peening

Controlled shot peening treatment

In new applications, SONATS technicians and engineers make a complete study of the characteristics of both the part and the variables of the shot peening process to controll the shot peening treatment in order to develop the most appropriate solution.

For each of these applications, the customer defines their specific objectives and requirements in terms of values :

Residual surface stresses
Depth affected
Roughness
Almen intensity (N, A, C)
Critical areas radii
Production rates

Based on these elements, SONATS conducts its study in two directions :

Learn more about our portatble ultrasonic shot peening equipment.

TREATMENT CONFIGURATION

The optimal orientation of the acoustic assembly with respect to the part is determined working closely with engineering to consider the dimensions of the elements close to the treatment area, but also the level of compressive stresses to be introduced in the part. This step also makes it possible to design the treatment chamber correctly, to choose its materials and to integrate additional components designed to direct the flow of medias towards the areas to be impacted thus optimising the process time.

TREATMENT PARAMETERS

This step identifies the process parameters that will achieve the required shot peening intensities. These parameters are the frequency and the amplitude, the dimensions and the shape of the sonotrode, the distance between the sonotrode and the zone to be treated, the treatment time, the grade, hardness and mass of balls to be used. Small diameter medias are used to obtain high surface stresses while larger diameter medias are used to achieve deeper treatment.

The various treatment combinations developed are characterised by considering measurements of surface roughness and residual stress introduced.

Examples of applications of the development of a surface impact treatment

SONATS developed an ultrasonic shot peening treatment solution for a repair operation on an aeronautical component. The tooling and parameters were defined during the qualification stage and the treatment range was then applied to the disassembled part isolated from the engine by the customer’s service department. This operation: