ES203279A1 - Improvements in or relating to cutting and abrading tools - Google Patents

Abstract

Procedure for obtaining the sharp edges in the cutting tools characterized by comprising the steps of lifting from the surface of a piece of plate or pulling parallel rows of tabs, each one separated on its lateral edges, separated from the material of the plate by slits that extend to the root of the tongue and each of the tongues disposed inclined upward from the surface of the plate at an acute angle and to such an extent that the free end of the tongue is spaced from the surface a distance equal to at least material thickness; of undercutting the raised free ends of the tabs parallel to the plate surfaces to thereby form sharp edges at the ends of the tabs at the hole peripheries of the material; of bending the plate or strip in one direction along the root lines of the tongues or along lines inside the tongue bodies (without at least appreciably bending the tongues) with sharp edges on the convex side of curvature and of bending inversely in the other direction along lines located between the fixed tongues to prepare the plate forming a series of projections whose ridges or upper parts are in lines located in or next to the lines of the free ends of the tabs and each of whose projections has a side inclined up to its upper part with the tabs continuing the inclination above the ridge to present the cutting edges above the plane determined by the projections; the angle that the mentioned side and the tabs form in the general plane of the plate or strip constitutes a relief angle suitable for the edges and for hardening or hardening the cutting edges. (Machine-translation by Google Translate, not legally binding)