B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
B23B 51/00 (2006.01)
Patent
CA 2597163
A drill head for boring a deep hole capable of increasing boring accuracy by improving the roundness and the straightness of the hole. The drill head for boring the deep hole is formed by fixing a cutting edge (2) to the tip face side of a head body (1) and guide pads (3) and (4) to the tip outer peripheral side of the head body (1). The axial length (Lm) of a margin part (6) formed on the outer peripheral part tip side of the cutting edge (2) in the drill rotating direction and the axial lengths (Lp) of the guide pads (3) and (4) are determined to be substantially equal to each other, and the tip and rear end positions of the margin part (6) are aligned substantially with the tip and rear end positions of the guide pads (3) and (4) in the circumferential direction.
La présente invention concerne une tête de forage profond qui permet d~améliorer la précision de forage, à savoir la circularité et la rectitude du trou. La tête de forage profond comporte une arête de coupe (2), fixée à la face d~extrémité d~une tête de forage (1), et des patins de guidage (3) et (4), fixés autour de l~extrémité de la tête de forage (1). La longueur axiale (Lm) de la partie marginale (6) située autour de l~extrémité de l~arête de coupe (2) dans la direction de rotation de la foreuse et les longueurs axiales (Lp) des patins de guidage (3) et (4) sont sensiblement équivalentes ; la position des deux extrémités de la partie marginale (6) est largement alignée sur la position des deux extrémités des patins de guidage (3 et 4), dans le sens de la circonférence.
Nomura Takuji
Sakai Makoto
Gowling Lafleur Henderson Llp
Unitac Incorporated
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