Rotatable cutting bit assembly with cutting inserts

Details Rotatable cutting bit assembly with cutting inserts Rotatable cutting bit assembly with cutting inserts

E - Fixed Constructions

21

B

E21B 10/00 (2006.01) E21B 10/56 (2006.01) E21B 10/60 (2006.01)

Patent

CA 2293276

A rotatable cutting bit which comprises an elongate bit body which has a forward end (37) and a rearward end and which defines a peripheral surface (42). The bit body contains a first seat (46) at the axially forward end thereof. A first cutting insert (60) is mechanically retained in the seat so as to present a clearance cutting edge (72) which radially extends past the peripheral surface of the bit body. The first cutting insert has a leading cutting edge (80) disposed at a lead angle (C) between 50 degrees and 80 degrees.

La présente invention concerne un trépan tranchant rotatif comprenant un corps de trépan oblong présentant des extrémités avant et arrière et formant une surface périphérique. Le corps du trépan comprend un premier siège au niveau de son extrémité axiale avant. Un premier élément rapporté tranchant est mécaniquement retenu dans le siège de manière à présenter un bord de coupe mort qui s'étend radialement en passant devant la surface périphérique du corps du trépan. Le premier élément rapporté tranchant est pourvu d'un bord d'attaque tranchant disposé à un angle d'attaque situé entre 50 et 80 degrés.

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