Cutting insert for shaping by chipping

Details Cutting insert for shaping by chipping Cutting insert for shaping by chipping

B - Operations, Transporting

23

B

B23B 27/14 (2006.01)

Patent

CA 2288834

The invention relates to a cutting insert for shaping metallic workpieces by chipping. Said cutting insert is especially suited for use in solid drills or double-bit cutters. It has at least one cutting edge (12) which is delimited by a chipping face (14) and a flank (16) and extends between two cutting corners (10). Said cutting edge comprises two sections (20) of the cutting edge which form an obtuse angle and in the area of a roof-shaped tip (18) merge into each other. The chipping face (14) has a raised shaped chipping element which extends from the inside of the chipping face (14) as far as the cutting edge (12), from where it reaches beyond the roof-shaped tip (18) partially across the two sections (20) of the cutting edge. Said cutting edge sections (20) and the adjoining chipping faces (14) comprise a step (24) delimiting the shaped chipping element (22), the edges (26) of which step serve as additional cutting edges of the shaped chipping element (22).

L'invention concerne une plaquette de coupe pour usinage par enlèvement de copeaux de pièces métalliques. Cette pièce rapportée de coupe s'utilise avant tout dans des forets pleins ou dans des systèmes de coupe doubles. Cette plaquette de coupe comporte au moins une arête tranchante (12) qui s'étend entre deux angles de coupe (10), est délimitée par une face d'attaque (14) et une face de dépouille (16) et comporte deux sections tranchantes (20) à activité au moins partielle qui se confondent dans la zone d'une pointe (18) en forme de toit, en formant un angle obtus. Dans la face d'attaque (14), il est prévu un élément de formation de copeaux saillant qui va de l'intérieur de la surface d'attaque (14) jusqu'à l'arête tranchante (12) où il s'étend au-dessus de la pointe (18) en forme toit en partie sur les deux sections tranchantes (20). Les sections tranchantes (20) et les surfaces d'attaque (14) adjacentes présentent un gradin (24) délimitant l'élément de formation de copeaux, dont les arêtes marginales (26) servent de lames secondaires de l'élément de formation de copeaux (22).

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