GFRP切削における工具の摩耗機構

抄録

It was experimentally clarified how the wear occurs at a tool cemented the hard grain in a matrix binder such as a cemented carbide tool in cutting GFRP. Cutting two work materials of short glass fiber reinforced polyester resin and of glass beads reinforced polyester resin which contain same content of reinforcements, it was shown that the fibrous glass in resin causes the tool wear characteristic that the tool wear increases with increase of cutting speed over a certain cutting speed in cutting GFRP. Then, GFRP-disk was cut with various kinds of cemented carbides tools. The tool of WC-Co grade wears less than the tool of alloyed WC-Co grade at same volumetric Co-content, and the tool wear increases with increase of Co-content in case of the tool of WC-Co grade. In case of the tool cemented the hard grain in a matrix binder, the tool wear seems to progress due to both the cutting away of the binder and the falling off of the hard grains, so the binder between the grains needs to be thin and its bonding strength needs to be high.