Method of forming rotary drilling tools

Details Method of forming rotary drilling tools Method of forming rotary drilling tools

1996-06-17

1998-05-05

Watts, Douglas D.

Metal tools and implements, making

Blank or process

Drill

408230, B21K 504

Patent

active

057460957

ABSTRACT:
Method of forming rotary drilling tools (1) for working on materials subject to brittle failure, such as drilling tools or hammer drilling equipment, includes shaping an axially extending conveying helix (3) in an axially extending tool blank (11) and forming the conveying helix (3) in a region between an axially extending cutting head region (4) at one end of the blank and an axially extending shank (2) at the other end of the blank. The cutting head region (4) is free of any conveying helix and has an axial extent of at least 10% of the maximum diameter (d) of the rotary drilling tool in the axially extending region of the conveying helix.

REFERENCES:
patent: 302600 (1884-07-01), Stetson
patent: 3706504 (1972-12-01), Simonffy
patent: 4696334 (1987-09-01), Haussmann

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