Method of making surface-hardened metal shot

Details Method of making surface-hardened metal shot Method of making surface-hardened metal shot

1995-06-14

2000-02-01

Bryant, David P.

Metal working

Bias cutting of tubular stock

29 907, 29899, B21K 2106

Patent

active

060188545

ABSTRACT:
When a shot having a hardness equal to or higher than a ferrous or nonferrous metal shot material is blasted against the surface of the metal shot material at a blasting speed of 80 m/s or above, the collision causes heat to be generated only in portions of the metal shot material against which the shot has collided. The temperature is raised in the vicinity of the surface of the metal shot material. Alternatively, the metal shot material may be blasted against a metal body having a hardness at least equal to that of the temperature of the metal shot material. In either case, the temperature in the vicinity of the surface of the metal shot material is increased to or above an A.sub.3 transformation temperature when the material is ferrous and is increased to or above a recrystallization temperature when the material is nonferrous. Subsequently, the metal shot material is quickly cooled. As a result, the metallurgical structure of the surface layer 20.mu. deep from the surface of the metal shot material is refined such that a highly hardened and tough structure is obtained. Part of the metal shot material and the shot is recovered and the recovered metal shot material and the shot are reblasted against unrecovered metal shot material and the shot, repeatedly.

REFERENCES:
patent: 2758360 (1956-08-01), Shelter
patent: 2816466 (1957-12-01), Gladfelter et al.
patent: 2895816 (1959-07-01), Cline
patent: 4067240 (1978-01-01), Straub
patent: 4209326 (1980-06-01), Klein et al.
patent: 4714622 (1987-12-01), Omori et al.
"What Makes Good Steel Shot", Charles E. Carlin, Metal Progress, pp. 82-85, Jun. 1959.
Patent Abstracts of Japan, vol. 18, No. 622 (M-1712) Nov. 28, 1994.
Patent Abstracts of Japan, vol. 17, No. 172 (M-1392) Apr. 2, 1993.

Affiliated with

Also associated with

Rating

Method of making surface-hardened metal shot does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of making surface-hardened metal shot, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making surface-hardened metal shot will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-928822