The influence of cutting parameters, glass fiber content in the workpiece material and cutting edge on the machining results was studied. It could be shown, that the cutting edge has the largest impact on the machining results. A phenomenological model describing the influence of the cutting edge on hole quality was developed. The most notable result is that the influence of the cutting edge on hole quality can be reduced to two determinants. These are feed force and fiber separation. An increase of feed force leads to a decrease of hole quality. If the cutting edge radius is larger than the fiber diameter the separation of fibers is severely impeded. This degrades the hole quality as well. Obviously, and in contrast to the present understanding of drilling of metals, applying tools with optimized cutting edge roundness is not the best solution for fiber reinforced thermoplastics. The high quality needed when drilling fibre reinforced plastics can only be realized with sharp cutting edges.
Drilling of long fiber reinforced thermoplastics - Influence of the cutting edge on the machining results
2010
4 Seiten, 8 Bilder, 1 Tabelle, 8 Quellen
Aufsatz (Konferenz)
Englisch
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