Accurate superposition modeling method of grinding-shot peening surfaces

Abstract

The coexistence of initial surface texture features and shot peening texture features in the final surface topography is a significant feature of shot peening. After the initial surface topography is strengthened by shot peening, the wave peak will produce more substantial deformation relative to the wave valley, which has not been considered in the existing superposition modeling methods. Taking the surface generated by the grinding-shot peening process as the research object, based on the feature extraction of measured topography, the concept of “Shot peening texture depth distribution surface” is put forward. And the texture depth distribution surface is theoretically used to optimize the characteristic baseline of shot peening processing in the proposed accurate superposition method. The measured grinding-shot peening surfaces verify the given method. It is found that the topographical and spatial features of the surfaces superimposed by this method are consistent with those of the measured surfaces, and the error of roughness parameters defined by ISO25178 is less than 8%.