| 摘要 |
A nicked cutting tool enables high speed cutting in cutting process of advanced materials such as compound materials. The nicked cutting tool has a cylindrical main body with one end forming a cutting part and the other end a shank part to be mounted on a rotary driving means, and its base body is of cemented carbide. The cutting part comprises an even number of spiral twisted grooves formed on the circumferential face, lands formed between the twisted grooves, cutting edges along one edge of each land which are of sinter of high hardness nad high wear resistance and fitted and unified by sintering to the base body, plural nicks disposed on the lands and sharp outer edges formed between the nicks on the lands. The nicks on one of any two lands circumferentially adjacent to each other inclines by a specific angle with respect to the longitudinal axis, while those on the other land inclines in the opposite direction thereto, and likewise the outer edges on one of any two lands face the tip of the cutting part, while those on the other land face the shank part. The shank part is mounted to a rotary driving means and driven to only rotate without vertical reciprocation, so that cutting-up perfermance is done by the sharp outer edge formed on one of any two lands and cutting-down perfermance by those on the other land.
|
