Drilling tool with rounded insert support surfaces

Details Drilling tool with rounded insert support surfaces Drilling tool with rounded insert support surfaces

B - Operations, Transporting

23

B

B23B 51/00 (2006.01) B23B 41/02 (2006.01) B23B 51/04 (2006.01) B23P 15/28 (2006.01) E21B 10/46 (2006.01) E21B 10/56 (2006.01)

Patent

CA 2192578

A drilling tool for ejector drilling comprises tangentially located cemented carbide cutting inserts (10A, 10B, 10C), preferably three. This simplifies the making of the insert pockets quite considerably. Further, the semi-circle formed basic shape of the cutting inserts is very favourable when they are pressed. Preferably, there is a turned-out chip space (13) in the end of the central hole in order to minimize the risk for chip jamming. Preferably, the drill is made of one single piece.

Outil de perçage destiné au forage par éjecteur qui comprend des pièces rapportées (10A, 10B, 10c) de coupe en carbure métallique situées de manière tangentielle, de préférence au nombre de trois. Cela simplifie considérablement la fabrication des poches de pièces rapportées. En outre, la forme de base en demi-cercle des pièces rapportées de coupe est très pratique lorsque lesdites pièces sont pressées. De préférence, il existe un espace (13) tourné vers l'extérieur destiné aux copeaux à l'extrémité du trou central afin de réduire au minimum le risque d'accumulation des copeaux. Ladite perceuse est de préférence constituée d'une seule pièce.

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