Article

Analysis of the Influence of Superfinishing on the Surface Topography of Ground Cemented Carbide Rods

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Abstract

The industrial relevance of high quality bore holes for parts of the automotive industry rises due to the growing requirements to limit CO2 emissions and therefore the tendency of using elevated pressures for the fuel injection. To fulfil these requirements the bores must have a very high surface quality. If large length-to-diameter (l/d) ratios are necessary, e.g. in machining of fuel injectors, deep hole drilling with single-lip drills (SLD) is mostly used to reach good surface qualities. Due to their asymmetric shape one component force acts as a normal force on the circumferential guiding pads of SLDs. For difficult to machine materials the mechanical loads increase as well. This results in a higher wear of the circumferential guiding pads of SLDs, which leads to reduced surface qualities. Many investigations have dealt with the influences of a cutting edge preparation to increase tool life and process parameters to optimise the productivity. Up to now no research work has dealt with the influences of the surface topography of the circumferential guiding pads on the produced bore quality. Thus, in this paper a superfinishing process is applied on cemented carbide rods as model workpieces with the circumferential shape G of SLDs to examine the influences of e.g. the grain size of the finishing film and the pulley hardness on the surface topography and the material removal at the circumferential surfaces.

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... Some examples include high alloyed steels in deep hole drilling (see Fig. 34(a)). Bathe & Biermann [9] investigated the influence of the surface topography of the circumferential guiding pads on the produced bore quality. A superfinishing process was applied on cemented carbide rods for surface treatment. ...
... Different laser textured patterns before and after tribology tests: (a) dimples and (b) channels produced with nanosecond laser, (c) formation of transfer layers on channels produced using nanosecond laser, (d) formation of nano-ripples on the dimples generated using femtosecond laser [8]. [11] and surface treatment methods for tribological enhancement of the guide pads of single-lip drilling tools (b) [9]. edge corner towards the secondary cutting edge. ...
... This is then followed by the identification of the hypothesis of the benefit that should be 48. Summary diagram of structured cutting tool preparation, evaluation, and implications for workpiece quality and tool performance [6,9,11,19,83,90]. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.) ...
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