Drill bit for advanced materials

Details Drill bit for advanced materials Drill bit for advanced materials

1992-05-07

1993-06-08

Bishop, Steven C.

Cutting by use of rotating axially moving tool

Tool having crystalline cutting edge

408 59, 408227, 408144, B23B 5100

Patent

active

052173321

ABSTRACT:
A high performance drill bit is presented for precision drilling of holes in hard-to-drill materials, such as a carbon fiber reinforced plastic material. The drill is a gun drill type having a pair of flat flutes and a pair of air holes for delivering coolant and/or lubricant. The main feature of the drill is the provision of two pairs of cutting edges formed on the intersecting ridges formed at the leading sides of the flank surfaces with the flute surfaces. At the tip of the drill bit, a pair of primary cutting edges, having a point angle .alpha., is disposed. It is followed by another pair of secondary cutting edges, having a point angle .beta., where .alpha.>.beta.. Physically, this means that the secondary cutting edges are inclined more toward the drill axis than the primary cutting edges. The secondary cutting edge is followed further by another flank surfaces which are even more inclined toward the drill axis.

REFERENCES:
patent: 5065647 (1991-11-01), Johnson
patent: 5137398 (1992-08-01), Omori et al.

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