On the correlation of hammer-peened surfaces and process, material and geometry parameters

Pfeiffer, S.; Fiedler, M.; Bergelt, T.; Kolouch, M.; Putz, M.; Wagner, M. F.-X.

doi:10.1088/1757-899x/480/1/012021

On the correlation of hammer-peened surfaces and process, material and geometry parameters (bibtex)

by S. Pfeiffer, M. Fiedler, T. Bergelt, M. Kolouch, M. Putz, M. F.-X. Wagner

Abstract:

Hammer-peening can replace extensive hand-polishing during the processing of freeform surfaces, but it is rarely applied in practice due to the interplay of numerous parameters, including the process and tool parameters as well as the geometry and the material of the workpiece. In the present study we systematically investigate the effect of tool radii, tool angles, pressure, path and impact distance and the path definition (with respect to the direction of previous surface milling) on the resulting surface roughness and strain hardening of a cast iron, a low- and a high-alloyed steel using a pneumatic tool setup and complementary Finite Element (FE) simulations. Our experimental results show that an impact and path distance of 0.18 mm, a pressure of 7.3 bar and a tool radius of 8 mm reduce the surface roughness of a face-milled surface with an average roughness of R_a = 0.8 μm to an average roughness of R_a = 0.5 μm for all materials under consideration. The FE simulations indicate that, for a ball-milled surface, the surface roughness R_a decreases (and the arithmetical mean height S_a increases) the most for a tool angle of 45° and for a hammer-peening path perpendicular to the previous ball-milling path. These results contribute to the development of a mathematical model that allows to identify suitable parameter combinations prior to hammer-peening processing for a given workpiece surface.

Reference:

Pfeiffer, S., Fiedler, M., Bergelt, T., Kolouch, M., Putz, M., Wagner, M. F.-X.: On the correlation of hammer-peened surfaces and process, material and geometry parameters, IOP Conference Series: Materials Science and Engineering 480, 012021, 2019.

Bibtex Entry:

@Article{Pfeiffer2019,
  author    = {Pfeiffer, S. and Fiedler, M. and Bergelt, T. and Kolouch, M. and Putz, M. and Wagner, M. F.-X.},
  title     = {On the correlation of hammer-peened surfaces and process, material and geometry parameters},
  journal   = {{IOP} Conference Series: Materials Science and Engineering},
  year      = {2019},
  volume    = {480},
  pages     = {012021},
  month     = {mar},
  abstract  = {Hammer-peening can replace extensive hand-polishing during the processing of freeform surfaces, but it is rarely applied in practice due to the interplay of numerous parameters, including the process and tool parameters as well as the geometry and the material of the workpiece. In the present study we systematically investigate the effect of tool radii, tool angles, pressure, path and impact distance and the path definition (with respect to the direction of previous surface milling) on the resulting surface roughness and strain hardening of a cast iron, a low- and a high-alloyed steel using a pneumatic tool setup and complementary Finite Element (FE) simulations. Our experimental results show that an impact and path distance of 0.18 mm, a pressure of 7.3 bar and a tool radius of 8 mm reduce the surface roughness of a face-milled surface with an average roughness of R\textsubscript{a} = 0.8 μm to an average roughness of R\textsubscript{a} = 0.5 μm for all materials under consideration. The FE simulations indicate that, for a ball-milled surface, the surface roughness R\textsubscript{a} decreases (and the arithmetical mean height S\textsubscript{a} increases) the most for a tool angle of 45° and for a hammer-peening path perpendicular to the previous ball-milling path. These results contribute to the development of a mathematical model that allows to identify suitable parameter combinations prior to hammer-peening processing for a given workpiece surface.},
  doi       = {10.1088/1757-899x/480/1/012021},
  publisher = {{IOP} Publishing},
}