B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
B23B 51/00 (2006.01) B23B 51/02 (2006.01)
Patent
CA 2687988
The drilling tool (4, 28) functions particularly as a special drill for dry drilling or for drilling special materials such as stainless steel. The drilling tool (4, 28) has a drilling head (2) with two primary cutting edges (22A, 22B) which are separated from each other by a cutting height difference (.DELTA.h). A drilling point (18) is also arranged displaced from a middle axis (16) such that one of the two primary cutting edges (22A) has a larger radial length. By these means, the drilling tool (4, 28) drills a larger bore hole (26) than the drill bit nominal diameter (D1). In addition, the cutting height difference (.DELTA.h) produces a radial force component (FB) working in the opposite direction such that the radial load on the drilling tool (4, 28) is reduced.
L'invention concerne un outil de perçage (4,28) servant notamment de foret spécial pour le perçage à sec ou le forage de matériaux spéciaux tels que l'acier inoxydable. Cet outil de perçage (4,28) comprend un tête de perçage (2) dotée de deux arêtes principales (22A,22B) séparées l'une de l'autre par une différence de hauteur de coupe (.DELTA.h). La pointe de perçage (18) est décalée par rapport à un axe médian (16), de sorte qu'une des deux arêtes principales (22A) présente une longueur radiale plus importante. Ainsi, l'outil de perçage (4,28) perce un plus gros trou (26) relativement au diamètre nominal du foret (D1). La différence de hauteur de coupe (.DELTA.h) produit en outre une composante de force (FB) radiale antagoniste, diminuant ainsi la sollicitation radiale de l'outil de perçage (4,28).
Kennametal Inc.
Smart & Biggar
LandOfFree
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