Abstract
The surface topography of workpieces is generated by and related to the manufacturing process. The blasting process specifically leads to dimples caused by accelerated particles hitting the surface. As the number of impacts increases over time, the surface topography changes. The scope of the study was to find a suitable areal roughness parameter or parameter set that correlates with this change. Additionally, the optimal time for creating a uniformly covered surface was analyzed. To conduct the research, an automated blast wheel process was applied. The workpieces were set on a rotating carrier with the spin wheel in the middle to ensure uniform coverage. 1.4301 steel specimens were blasted with spherical blast media at a spin wheel speed of 9000 min-1. The time varied between 1 and 20 minutes. The areal measurement was carried out by confocal microscopy. After obtaining the areal surface data, areal roughness parameters according to ISO 25178-2 and additional parameters based on motif analysis were calculated. For each measurement, 75 parameters are analyzed. The paper will present the applicability and correlation of the chosen parameters to the various blasting times.
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