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Title: Method of Making Surface-Hardened Metal Shot
Author: Yoshio Miyasaka
Source: US Patent 6,018,854
Publication year 2000
Document number: 2000009
Number of pages: 10
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
A3 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 20µ 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.
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This page last revised: 04/24/2008