3412 Relation between Tool Wear and Co Contents in Cutting Cemented Carbides
Details
Cemented carbides consist of WC hard particles and metallic binder Co. They have high hardness and strength. It is well known that they are a kind of difficult-to-cut materials and the tool wear is very severe. In previous study, the turning and the micro cutting in the SEM were carried out to make clear the tool wear mechanism, the behavior of the crack and the particle and the effect of cutting fluid. However, there is few paper about the influence of Co contents. Then, in this paper, the turning of seven kinds of cemented carbides (V40, V50, V60 and WC-10%, 15%, 20%, 25%Co) was carried in order to make clear the influence of Co contents in the dry and wet cutting. The main results are shown as follows. (1) There are the Co contents as the factor of the tool wear in addition to the abrasive wear by the WC particles. (2) The tool wears decrease due to the lubricating properties. On the other hand, they increase the thickness of removal stock and the tool wear is severe in the case of large WC particles.
