B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
B23B 51/02 (2006.01)
Patent
CA 2129735
A precision twist drill including two helical teeth separated by flutes. The diameter is equal to the minimum diameter of the hole to be drilled +0.005 mm, the heel (3) has a width of 0.1-0.2 mm, the teeth have no foreside; the end is ground according to two angles with a central radiate pit (4); the cutting edges (1, 2) of the two pits (4) are symmetrical and all the drill surfaces are polished with an accuracy of under 0.1 micron Ra.
2129735 9413421 PCTABS00166 Foret hélicoïdal de précision comprenant deux dents hélicoïdales séparées par des goujures. Selon l'invention, le diamètre est égal au diamètre minimal du trou à percer +0,005 mm, le listel (3) est d'une largeur comprise entre 0,1 et 0,2 mm, le devant des dents est nul; l'affûtage en bout est à deux pentes avec piqûre (4) rayonnée au centre; les arêtes coupantes (1, 2) des deux piqûres (4) sont symétriques et toutes les surfaces du foret sont polies à une précision inférieure à 0,1 micron Ra.
Etablissements Recoules Et Fils (s.a.)
Swabey Ogilvy Renault
LandOfFree
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