Machine Hammer Turning – Integration of mechanical surface modification into the cutting operation

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Mechanical surface treatments usually represent an additional process step following machining. The aim of this research project is to achieve surface microtexturing during machining in parallel with the machining process using the hammering turning process strategy. The target parameter here is the setting of a direction-dependent friction coefficient by means of an anisotropic microtexture of the surface, whereby a resulting increase in hardening is intended to compensate for the consequences of the microtexture-induced notch effect. In the first project phase, the feasibility of the process combination was demonstrated. In the continuation of the project, these findings are to be transferred to the production and microtexturing of shafts. The focus here is on the tribological behavior of the microtextures. This results from the plastic deformation of the surface layer, which is caused by indentations of the cutting tool perpendicular to the surface. With the help of the mechanism understanding gained from the simulations and experiments, the tribological behavior of a surface microtextured by hammering turning is to be specifically adjusted. As the microtexturing occurs through the cutting edge of the hammering tool, the rake and flank surfaces can produce a scale-like microtexture. This scale-like topography is aimed to exhibit anisotropic tribological behavior in terms of friction and wear.