Cutting by use of rotating axially moving tool – Tool or tool with support – Having peripherally spaced cutting edges
Patent
1986-03-26
1987-08-25
Weidenfeld, Gil
Cutting by use of rotating axially moving tool
Tool or tool with support
Having peripherally spaced cutting edges
408227, B23B 5102
Patent
active
046889728
ABSTRACT:
In a twist drill in which the outer portion in each of the chisel edge lines at the drill point is made permanently efficient in cutting by a wall surface of an additional inner groove united to the original flute, an improvement resides in that the inner portion thereof adjacent to the center also functions as an efficient cutting edge in creating a built-up edge deposited over a specified resting face of a narrow triangular shape close to the center, in which the resting face is bordered by the inner portion and an intersecting curve passing through an intermediate point in the chisel edge line, whereby a permanent cutting effect is achievable all over the length of each of the chisel edge lines in regrinding the drill point.
REFERENCES:
patent: 1467491 (1923-09-01), Oliver
patent: 2778252 (1957-01-01), Oxford, Jr.
patent: 3564947 (1971-02-01), Maier
patent: 3779664 (1973-12-01), Caley et al.
patent: 4556347 (1985-12-01), Barish
patent: 4605347 (1986-08-01), Jodock et al.
"Machining Data File", vol. 2, 1979, p. 17/20, issued by Kikai Gijutsu Shinko Kyokai.
"Practical Tool Theater", by Masanori Rujitomi, published by Komine Kogyo Shuppan K.K., 1978, pp. 66-69.
"Tool Engineer Handbook", Second Edition, published by McGraw-Hill Book Co., Inc. 1959, pp. 28-24 and 28-25.
Howell Daniel W.
Weidenfeld Gil
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