Elongated drill with replaceable cutting inserts

B - Operations – Transporting – 23 – B

Patent

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Details

B23B 27/16 (2006.01) B23B 51/04 (2006.01)

Patent

CA 2213544

A metal cutting drill with replaceable cutting inserts and a length to diameter ratio of four to one or more. Two cutting inserts are positioned in exactly opposed diametric positions, and engage the workpiece in a substantially identical manner to precisely balance -the radial forces resulting from drill axially advancing though a workpiece. Through the use of dual cutting inserts, the drill cuts the full circumference of a bore with each one-half revolution and therefore achieves the a faster axial feed rate. By virtue of the inserts being triangular, the curved corners on the cutting edges of the two inserts may be positioned relatively close together and yet sufficient space is left between the inserts to enable the drill shank between the inserts to be relatively thick and strong even at increased length to diameter ratios. Through the provision of a length to diameter ratio greater than four to one, the bores which the drill is able to produce are substantially deeper at any given diameter than those achievable by prior art indexable drills.

Foret utilisé pour percer des métaux pourvu de plaquettes de coupe et possédant un rapport longueur-diamètre de quatre pour un ou plus. Les deux plaquettes de coupe sont placées en positions diamétralement opposées et attaquent la pièce à travailler de manière substantiellement identique pour équilibrer les contraintes radiales qui résultent de l'avance axiale du foret dans la pièce à travailler. Grâce à l'utilisation de plaquettes de coupe doubles, le foret taille toute la circonférence d'un trou à chaque demi-tour et, de ce fait, atteint une plus grande vitesse d'avance axiale. Comme les plaquettes sont triangulaires, les coins incurvés des bords tranchants des deux plaquettes peuvent être placés relativement près l'un de l'autre, et il reste suffisamment d'espace entre ces dernières pour permettre que la queue du foret entre ces plaquettes soit relativement épaisse et résistante même pour des rapports longueur-diamètre accrus. Avec un rapport longueur-diamètre supérieur à quatre pour un, les trous que le foret peut percer sont sensiblement plus profonds, peu importe le diamètre, que les trous réalisés par les anciens forets à plaquettes amovibles.

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