Method of reheating steel part

Details Method of reheating steel part Method of reheating steel part

2009-04-22

2011-11-15

Self, Shelley (Department: 3725)

Metal deforming

With temperature modification of tool or of specified...

Cooling

C072S364000, C072S342500, C148S639000

Reexamination Certificate

active

08056383

ABSTRACT:
A steel part with regions of different ductility is made by first loading the part onto a heatable rack and then heating the rack with the part on it in a furnace to a temperature above the AC3point of the part. The part is then removed from the rack and loaded while still above the AC3point into a press where it is shaped and hardened. In the press the part is engaged by tools that deform it and that cool it quickly to well below the AC3point. Finally, before the rack has cooled substantially, the shaped and hardened part is taken out of the press and placed on the rack with predetermined regions of the part in heat-conducting engagement with the rack such that the ductility of the predetermined regions is increased by transfer of the residual heat from the rack to the predetermined regions.

REFERENCES:
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patent: 5916389 (1999-06-01), Lundstroem
patent: 5972134 (1999-10-01), Buschsieweke
patent: 7041181 (2006-05-01), Gosmann
patent: 7077920 (2006-07-01), Gehringhoff
patent: 2004/0112485 (2004-06-01), Reinhold
patent: 2007/0107819 (2007-05-01), Gehringhoff
patent: 2008/0041505 (2008-02-01), Reinhold
patent: 2452486 (1985-10-01), None

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