Drill for use in drilling hard and brittle materials

Details Drill for use in drilling hard and brittle materials Drill for use in drilling hard and brittle materials

1990-08-29

1992-06-23

Kisliuk, Bruce M.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51209R, 761081, 175425, 408144, 408145, B23B 2714, B23B 2720

Patent

active

051232170

ABSTRACT:
A drill for use in drilling hard and brittle materials includes a shank and a drilling portion attached to one end of the shank. The drilling portion includes a tapered primary cutting edge, a first secondary cutting surface extending from the primary cutting edge and having an angle of taper substantially identical to that of the primary cutting edge, and a second secondary cutting surface extending from the first secondary cutting surface and containing a line substantially parallel to the central axis of the drill. The primary cutting edge has a first abrasive grain layer, and the first and second secondary cutting surfaces both have a second abrasive grain layer. The first and second abrasive grain layers both have a binder made of material selected from the group consisting of metal, resin and glass. Each abrasive grain in the first abrasive grain layer has a diameter greater than that of each abrasive grain in the second abrasive grain layer.

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Tool and Manufacturing Engineer's Handbook, Fourth Ed., vol. 1, "Machining", Society of Manufacturing Engrs., 11-18 to 11-20, 1983.
American National Standard Engineering Drawings and Related Documentation Practices, "Dimensioning and Tolerancing", ASME, pp. 4-5, 9, 132, 1983.

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