Method of making drill with wear inserts

Details Method of making drill with wear inserts Method of making drill with wear inserts

1991-02-25

1991-08-13

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

Drill

76DIG11, 76DIG12, 408145, 408230, B21K 504

Patent

active

050386425

ABSTRACT:
The brazing seams that attach cutting edge wear inserts on a drill are protected against wear and erosion. The inserts are deliberately differentially sized so that the points where the brazing seams that attach them intersect the cutting edges are differentially spaced from the drill center line. Then, a notch is cut into each cutting edge just wide and deep enough to prevent the brazing seam from contacting the cut. Cutting is still complete, despite the notches, since they do not overlap.

REFERENCES:
patent: 1847302 (1932-03-01), Emmons
patent: 2832238 (1958-04-01), Brinker et al.
patent: 4679971 (1987-07-01), Maier

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