Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
1999-09-08
2001-12-18
Wyszomierski, George (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S630000, C148S658000
Reexamination Certificate
active
06331219
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to rolling mills producing hot rolled steel products such as rods, bars and the like, and is concerned in particular with an improved system and method for cooling such products at retarded cooling rates.
2. Description of the Prior Art
It is known to form hot rolled steel rod into rings which are deposited on a conveyor and transported through cooling zones where the rod is cooled at controlled rates in order to achieve desired metallurgical properties. Cooling rates may be accelerated through the forced application of a gaseous coolant, typically ambient air, or the cooling rates may be retarded through the use of insulated covers overlying the conveyor. Examples of the foregoing are disclosed in U.S. Pat. No. 3,320,101 (McLean et al.); U.S. Pat. No. 3,930,900 (Wilson); U.S. Pat. No. 3,940,961 (Gilvar) and U.S. Pat. No. 4,468,262 (Kaneda et al.).
One drawback of such installations is that prolonged exposure of the rings to ambient air encourages the development of surface scale, which must then be removed before the product can be subjected to further processing e.g., wire drawing, machining, etc. Also, cooling rates tend to be non-uniform and somewhat difficult to control.
Other attempts at more uniform retarded cooling have included the use of hot water baths and fluidized beds, but these have not proven to be commercially viable.
SUMMARY OF THE INVENTION
The objective of the present invention is to overcome the drawbacks associated with the above described prior art systems by embedding the rings being transported on the conveyor in granular insulation material. By doing so, exposure of the ring surfaces to ambient air is significantly minimized, with a concomitant reduction in the development of surface scale. Collateral advantages include more uniform cooling, and an ability to more closely control cooling rates, for example by either heating or cooling the granular insulation material prior to its application to the product rings.
REFERENCES:
patent: 3276920 (1966-10-01), Sims
patent: 3320101 (1967-05-01), McLean et al.
patent: 3378248 (1968-04-01), Krahe et al.
patent: 3506468 (1970-04-01), Geipel et al.
patent: 3525507 (1970-08-01), Geipel et al.
patent: 3930900 (1976-01-01), Wilson
patent: 3940961 (1976-03-01), Gilvar
patent: 4382586 (1983-05-01), Reese
patent: 4410373 (1983-10-01), Kemp
patent: 4468262 (1984-08-01), Kaneda et al.
patent: 4591335 (1986-05-01), Buxel et al.
patent: 4800949 (1989-01-01), Bak et al.
patent: 4861394 (1989-08-01), Colin et al.
patent: 5101652 (1992-04-01), Burk et al.
patent: 81035A (1980-09-01), None
Puchovsky Melicher
Shore T. Michael
Combs-Morillo Janelle
Morgan Construction Company
Samuels Gauthier & Stevens
Wyszomierski George
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