| 摘要 |
Efficient cutting of deposit forming steels, such as described in French Pat. No. 1,387,441, with tungsten carbide cutting insert having a high tungsten carbide content over an extended period of time is difficult. Efficient cutting of such deposit forming steels over a wide speed range from about 50 to about 350 m/min is made possible by embodying in the cutting edge surface stratum of the cutting tool at least 15 percent of one or more of the carbides or borides of Ti, Ta, Zr, Nb and V, or at least 50 percent aluminumoxide in the tool surface stratum may be embodied either by diffusion, or by affixing such surface layer to a known tungsten carbide insert, or by sintering stratified compacts of powder particle mixtures cohering a thick powder mixture layer containing a large proportion of tungsten carbide is covered along one or on its opposite layer surfaces with a thin powder mixture strata, each of which contains at least 15 percent of one or more of the carbides or borides of Ti, Ta, Zr, Nb and V.
|
