Case hardened roller cutter for a rotary drill bit and method of

Details Case hardened roller cutter for a rotary drill bit and method of Case hardened roller cutter for a rotary drill bit and method of

1989-10-13

1990-11-13

Parker, Roscoe V.

Metal tools and implements, making

Blank or process

Drill

76DIG12, 76DIG2, 148 166, B21K 502

Patent

active

049693786

ABSTRACT:
A roller cutter (28) for a rotary drill bit (10) and method of making, utilizing an ion nitriding hardening process for the external surface (42) and the internal bearing surfaces (33, 34, 38) in the central cavity (30) of the roller cutter (28). The roller cutter (28) is made from a through hardenable steel and the ion nitrided hardened layer (77) has a total thickness less than around 0.030 inch. Hardened layer (77) has a relatively thick inner stratum (80) and a relatively thin outer surface stratum (78). The outer stratum (78) is formed of Fe.sub.4 N having a thickness no greater than around 0.0004 inch to form an outer surface which is ductile and has a relatively low friction coefficient.

REFERENCES:
patent: 4011111 (1977-03-01), Hook
patent: 4054426 (1977-10-01), White
patent: 4212687 (1980-07-01), Tanaka et al.
patent: 4303137 (1981-12-01), Fischer
patent: 4309227 (1982-01-01), Kajikawa et al.
patent: 4640169 (1987-02-01), Fromson et al.
patent: 4704168 (1987-11-01), Salik et al.
"Industrial Heating" magazine, Jul. 1987 issue article entitled Basic Principles and Applications of Ion/Plasma Nitriding with Focus on AISI 4140 by Larry Jones.
"Heat Treating" magazine, Mar. 1987 issue article entitled Guidelines for Choosing The Ion Nitriding Process by James G. Conybear.
"Heat Treating" magazine, Jan. 1986 issue pp. 26-29, article entitled Technological, Industrial Trends and New Applications by M. H. Jacobs.
"Heat Treating" magazine Jan. 1986 issues, pp. 22-24 article entitled Eight Ion Treaters.
"Heat Treating" magazine, Jan. 1986 issue, pp. 30-31, article entitled Transistor-Based Power Supply Boosts Ion Nitriding's Viability by David Edwards.
"Metal Progress" magazine, Jul. 1963 issue, pp. 78-80 article entitled Working with Maraging Steels by John B. Seabrook.
"Heat Treating" magazine, Aug. 1985 issue, pp. 22-25 article entitled Holding Steady With Salt, Growing With Ion Nitriding by Richard Creal.
"Metal Progress" magazine, Mar. 1976, pp. 181-190 article entitled Production Ionitriding by Bernd Edenhofer.
Article entitled "An Introduction to Ion Nitriding, What is it? Why is it Used? Where is it Used?" (undated) by William Kovacs, William Russell.

Affiliated with

Also associated with

Rating

Case hardened roller cutter for a rotary drill bit and method of does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Case hardened roller cutter for a rotary drill bit and method of, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Case hardened roller cutter for a rotary drill bit and method of will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-770472