Drill bit

B - Operations – Transporting – 28 – D

Patent

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Details

B28D 1/14 (2006.01) B23B 51/00 (2006.01) B23B 51/02 (2006.01) E21B 10/44 (2006.01)

Patent

CA 2402142

An object of the present invention is to provide a drill bit capable of easily drilling a drill hole that has no rifling , and has high circularity, can be easily positioned, the drill bit comprising a cutting blade tip which is composed of a block body of cemented carbide, three cutting blade portions are formed circumferentially equidistantly around the cutting blade tip, a connection line between a cutting surface and a flank surface 6, said cutting and flank surfaces being formed in each said cutting blade portion 4a, 4b, 4c, acts as a main cutting edge 8 whereas a connection line between a connection surface 7 and said flank surface 6 acts as an auxiliary cutting edge 9, said main cutting edges 8 and said auxiliary cutting edges 9 cross at a blade tip point 10 so that said blade tip point 10 is shaped like a peak with no chisel edge, each said auxiliary cutting edge 9 lies on a line extending from said main cutting edge 8 of a said cutting blade portion located opposite across said blade tip point 10, and each of said main cutting edge 8, said auxiliary cutting edge 9, and a connection line between said connection and cutting surfaces 7, 5 crossing at said blade tip point 10 extends in a straight line.

Ce trépan ne possède pas d'anneau flottant, est facile à positionner, peut forer un trou ayant une très bonne circularité, et est caractérisé en ce que trois éléments de lame coupante sont formés sur l'extrémité de coupe comprenant un corps du type bloc réalisé dans du carbure métallique, et placés de manière équidistance dans le sens périphérique, en ce qu'une ligne de raccord entre la surface de coupe (5) et un flanc (6), formé sur chaque partie de lame coupante (4a, 4b, 4c), est utilisée en tant que bord coupant principal (8), en ce qu'une ligne de raccord entre une surface de raccord (7) et le flanc (6) est utilisée en tant que bord coupant auxiliaire (9), en ce que le bord coupant principal (8) et le bord coupant auxiliaire (9) se croisent l'un l'autre, au niveau du point d'extrémité de la lame (10), en ce que ce point d'extrémité (10) revêt la forme tranchante et sans bords d'un ciseau, en ce que le bord coupant auxiliaire (9) est réglé sur une ligne d'extension des bords coupants principaux (8) des parties de lame coupante qui sont placées des deux côté du point d'extrémité (10) de la lame, et en ce que le bord coupant principal (8), le bord coupant auxiliaire (9) et la ligne de raccord entre la surface de raccord (7) et la surface coupante (5) se croisant l'une l'autre au niveau du point d'extrémité (10) de la lame, revêtent la forme d'une ligne droite.

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