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High performance of hard metal tools for woodworking by gas boronizing

Hohe Leistungsfähigkeit von Hartmetallwerkzeugen für die Holzbearbeitung durch Gasborieren
: Fuchs, I.; Endler, I.; Peter, M.

17th International Wood Machining Seminar 2005. Proceedings : IWMS 17, Sept. 26-28, 2005 Rosenheim
Rosenheim, 2005
International Wood Machining Seminar (IWMS) <17, 2005, Rosenheim>
Conference Paper
Fraunhofer IKTS ()

The wood industry applies hard metal tools which combine good performance with high final cutting surface quality. Possibilities for increasing the performance of hard metal tools are surface hardening by thermo-chemical treatments or covering with hard coatings. A promising technique for wood-working tools is gas boronizing because of increasing the surface hardness as well as the corrosion resistance against aggressive organic components in wood. Three WC-Co grades with cobalt contents of 2, 4 and 10 % were used as substrate materials. The wedge angle of the cutting inserts is 55o. Gas boronizing was performed using a wide area of process parameters. Temperature, total pressure, BCl3-concentration and boronizing time were varied systematically and the surface zones were characterized by metallography, SEM, TEM, EDX, GDOES depth profiling, hardness and surface roughness. The wear behaviour of boronized inserts was examined by milling tests with melamine laminated particle board. In the case of milling laminated particle board an increase of the wear resistance was observed for all hard metal grades using optimized process conditions. But different hard metal grades require tailor-made boronizing procedures. An increase of the working distance between 40 % a nd 400 % was achieved in dependence of the cobalt-content of the cemented carbides. Milling tests with laminated particle board in the industry verified these results.