Apparatus for softening a selected portion of a steel object...

Details Apparatus for softening a selected portion of a steel object... Apparatus for softening a selected portion of a steel object...

2006-07-18

2006-07-18

Kastler, Scott (Department: 1742)

Metallurgical apparatus

Means treating solid metal

C219S675000, C148S903000, C148S640000

Reexamination Certificate

active

07077993

ABSTRACT:
Differential hardening apparatus for softening a portion only of a metal workpiece such as a die block consisting of apparatus for presenting a workpiece to a heat source which impinges heat directly on the workpiece and control means for causing the heat to be directed only long enough to soften only the portion which receives the heat so as to create a softened portion, such as the shank portion of a die block, and an unaffected hardened portion, such as the body portion of the die block.

REFERENCES:
patent: 3240639 (1966-03-01), Lihl
patent: 3365563 (1968-01-01), Basinger
patent: 3675905 (1972-07-01), Placek
patent: 4237359 (1980-12-01), Roth
patent: 4718950 (1988-01-01), Nishikawa
patent: 5018706 (1991-05-01), Butler et al.
patent: 5911844 (1999-06-01), Benedyk
patent: 6174388 (2001-01-01), Sikka et al.
ASM Handbook, vol. 4, Heat Treating. pp. 164-183 Apr. 5, 1995.

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