Abstract
Tribology in metal forming plays a significant role for process feasibility and process quality. Especially in micro forming the influence of the tribological condition is very essential due to an extensive increase in friction which is observed while scaling processes from macro to micro. As friction depends considerably on the surface topography of tool and workpiece, functional surface characterisation concerning the tribological properties becomes even more relevant. Standardised 2D roughness-measurements and -parameters are notable to fulfil this task satisfactorily. Hence the surface has to be measured three dimensionally. An appropriate method is given by confocal white light microscopy. New 3D parameters are defined with respect to the functional behaviour of the surface. These parameters are derived from a mechanical-rheological model which describes the transmission of the forming load from the tool to the workpiece. In order to calculate these parameters, the software WinSAM has been developed. Especially the maximum closed void area ratio and the volume of closed lubricant pockets have already proven their capability of characterising the tribological behaviour of the surfaces in the macro world. It is expected that these parameters are a basis for a functional characterisation of the topography in micro-forming applications as well.
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Weidel, S., Engel, U. Surface characterisation in forming processes by functional 3D parameters. Int J Adv Manuf Technol 33, 130–136 (2007). https://doi.org/10.1007/s00170-006-0644-x
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DOI: https://doi.org/10.1007/s00170-006-0644-x