Diamond coated cemented carbide tools are especially used for cutting of carbon-fibre-reinforced plastics, graphite, composite materials and aluminium alloys because of their high efficiency in these machining operations. The precision of tools like drills or milling cutters is often characterized by the runout of the tool which has significant importance on the quality of the worked material, as well as on the lifetime of the tool itself. In this thesis the runout of the tool is analysed throughout the entire production process, beginning with the rod and ending with the coated milling cutter. In particular the distortion of the tool because of the coating process was investigated. The investigation was focussed on a CERATIZIT carbide grade, which is especially suited for diamond coating. The influence of different sintering methods, the position in the sintering furnace, coercive force, magnetic saturation and residual stresses on the runout has been determined. Furthermore, the orientation of the runout (the direction of the bending of the tool) and its change due to the coating process has been examined. The results show a reduction of the runout in each production step and a slight increase caused by the diamond coating process. This increase is very small in comparison to other carbide grades and leaves more than 98% of the tools within the usual specification limit of this industrial branch. An effect of the different sintering methods on the runout is observed, but there is no influence of the sintering methods on the change of the runout due to diamond coating. Furthermore, no significant impact on the runout was found for the position in the sintering furnace and the magnetic characteristics of the material. Looking on the orientation of the runout more frequent directions of the tool bending and clear changes because of the diamond coating process could be found.
|Translated title of the contribution||Distortion of diamond coated cemented carbide tools|
|Award date||18 Dec 2015|
|Publication status||Published - 2015|
Bibliographical noteembargoed until 21-09-2020
- Cemented Carbide
- Milling Cutter
- Diamond Coating