Besarabets Y. Spiral drills with faltering cutting edges

The dissertation is devoted to heightening of operating performances of spiral drills by introduction in a construction of a drill an additional cutting edges. Thus, the horizontal scheme of cutting of a rough is applied. It allows to unload a peripheral zone of a drill and to diminish mutual influence of points on length of the principal cutting edge of a drill. The technique of definition of loading of the basic and additional cutting crimps on depth of cutting and width of a cut is developed. The theory is developed for definition of geometrical parameters of drills with faltering cutting edges and geometries of their undermined forward surface. The theory grinding a forward surface of a drill in the central zone is developed. Dependences for calculation of corners of installation of a drill are received at grinding a forward surface. With use of one of algorithms of method group registration of arguments mathematical models of force performances of drills with the faltering cutting edges, describing influence of constructive and regime parameters on axial force and a torque are received. By results of tool life and tolerance trials recommendations at the choice of constructive and regime parameters of drills of a new construction, and also technological features of their manufacture are developed. The designed constructions of a drill with faltering cutting edges have passed industrial trials and are accepted to introduction on manufacture.