Throwaway tip for deep-hole drilling and drill head for...

B - Operations – Transporting – 23 – B

Patent

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Details

B23B 51/00 (2006.01) B23B 51/06 (2006.01)

Patent

CA 2718547

Provided is a deep-hole boring throwaway tip of three-time symmetry, which can be applied as a central blade for a drill head to both a whole cutting type and a non-cutting core folding-off type. The deep-hole boring throwaway tip is formed into a thick plate type having such a three-time symmetry that three sections (P1 - P3) divided at a center angle of 120 degrees are identically shaped. The blade edge (1) to confront in the boring direction when the tip is mounted in drill heads (D1 and D2) forms an angle shape corresponding to a first section (P1) with a shorter inner blade (11) and a longer outer blade (12), and the outer blade (12) is constituted of two continuous blade portions of a crest-side outer blade portion (12a) of a smaller outer blade angle ((31) and a footside outer blade portion (12b) of a larger outer blade angle (P2).

La présente invention se rapporte à une pointe de forage de trou profond amovible de symétrie en trois temps, qui peut être appliquée en tant que lame centrale pour une tête de forage à la fois à un type coupe totale et à un type pliage de centre non coupant. La pointe de forage de trou profond amovible a la forme d'un type de plaque épaisse ayant une telle symétrie en trois temps que trois sections (P1 - P3) divisées à un angle central de 120 degrés sont formées de façon identique. Le bord de lame (1) tourné dans la direction de forage lorsque la pointe est montée dans les têtes de forage (D1 et D2) a une forme d'angle correspondant à une première section (P1) avec une lame intérieure plus courte (11) et une lame extérieure plus longue (12), et la lame extérieure (12) est constituée de deux parties de lame continues, à savoir une partie lame extérieure côté crête (12a) d'un angle de lame extérieure inférieur (ß1) et une partie lame extérieure côté pied (12b) d'un angle de lame extérieure supérieur (ß2).

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