Thread milling cutter with drilling edges

Details Thread milling cutter with drilling edges Thread milling cutter with drilling edges

1999-07-07

2001-05-15

Wellington, A. L. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool or tool with support

With pitch-stabilizing ridge

C408S224000, C409S065000, C470S199000

Reexamination Certificate

active

06231281

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to thread milling cutters with drill blade having a pre-drilling blade and a tapping blade.
BACKGROUND OF THE INVENTION
Japanese Provisional Utility Model Publication No. 72325 of 1993 discloses a thread milling cutter with drill blade having a pre-drilling blade at the tip of a thread milling cutter.
This thread milling cutter has a tapping blade in each of the auxiliary lands that are twice as large as the main lands by forming an auxiliary groove in the main lands provided on both sides of the main groove to ensure smooth removal of chips from pre-drilling and efficient accomplishment of subsequent thread cutting.
With this type of thread milling cutters, however, provision of the auxiliary groove inevitably decreases the cross-sectional area of each auxiliary land and thereby reduces the strength of the cutting blades formed therein. Then, stresses set up during high-speed cutting operation would break the thread milling cutter.
The object of this invention is to provide new type of thread milling cutters with drill blade that permit high-speed cutting without breaking.
SUMMARY OF THE INVENTION
A thread milling cutter with drill blade according to this invention comprises a drill blade provided at the leading end of a land divided by axial grooves and a tapered tapping blade provided behind the drill blade, with the upper end thereof in the direction of rotation projecting outward beyond the drill blade so as to decrease cutting resistance to the tapping blade and increase the strength of the thread milling cutter.


REFERENCES:
patent: 194469 (1877-08-01), Schaub
patent: 568277 (1896-09-01), Rall
patent: 1034724 (1912-08-01), Mueller
patent: 1863046 (1932-06-01), Githens et al.
patent: 1874378 (1932-08-01), Steinruck
patent: 2898612 (1959-08-01), Hofbauer
patent: 4271554 (1981-06-01), Grenell
patent: 4831674 (1989-05-01), Bergstrom et al.
patent: 4930949 (1990-06-01), Giessler
patent: 4943191 (1990-07-01), Schmitt
patent: 5733078 (1998-03-01), Matsushita et al.

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