Metal deforming – With cleaning – descaling – or lubrication of work or product – Mechanical cleaning
Patent
1974-11-18
1976-03-02
Mehr, Milton S.
Metal deforming
With cleaning, descaling, or lubrication of work or product
Mechanical cleaning
72201, 140 2, 266 3R, B21B 4502, B21B 4504, B21C 4300, B21F 2100
Patent
active
039409619
ABSTRACT:
Apparatus is provided for uniformly cooling hot rolled rod over a continuous range of cooling rates from less than 0.5.degree. C/sec. to about 20.degree. C/sec. together with a mechanism for removing scale accumulated therein in a confined and safe manner. The context is that of cooling hot rolled steel rod directly after the steel leaves the rod mill wherein the rod may either be cooled rapidly by forced air convection or cooled very slowly under conditions in which a heated fluid or radiant heating must actually be employed in order to retard the cooling rate. The apparatus includes a group of cooling chambers, each of which has a blower which can be used to force cool air from the atmosphere onto the rod. Some of the cooling chambers are also equipped with means for supplying heat to the rod as may be necessary to retard the cooling rate. When this is done in air, scale formation on the steel is more extensive due to the prolongation of time at high temperature, and as the scale builds up, it also tends to break away from the rod and fall to the bottom of the cooling chamber. The air streams, which are otherwise used to control the cooling of the steel by forced air convection, can then be redirected and used to entrain and dispose of the scale from the cooling chambers. This is done by an arrangement of ducts and dampers whereby the blowing is adapted to draw air either from the atmosphere for cooling or from the cooling chamber where the scale accumulates, for scale disposal. Thus, when the apparatus has been used in the retarded cooling mode, and it becomes desirable to change to the rapid cooling mode, the dampers are set so that the blowers withdraw scale from the cooling chambers and transmit it to the scale disposal facility. Then the dampers are reset so that the blowers can transmit air into the cooling chambers to cool by forced air convection. When the means for supplying heat to some other cooling chambers are used, in order to retard the cooling rate, the remaining cooling chambers may be used to cool either by natural or forced convection. Those chambers being used for cooling by natural convection may be alternately adapted for the removal of scale accumulation by the use of a blower. The cooling chambers are equipped with an arrangement of nozzles adapted to apply a greater proportion of the cooling medium to the sides of the rings than to the centers. This helps to overcome the mass-effect of the overlapped rings at the side of the conveyor so as to cool more uniformly in the rapid cooling mode. The same nozzles may also be employed in the slow cooling mode when a heated gas is applied to the rod.
REFERENCES:
patent: 777178 (1904-12-01), Boley
patent: 3231432 (1966-01-01), McLean et al.
patent: 3390871 (1968-07-01), McLean et al.
patent: 3452785 (1969-07-01), McLean et al.
patent: 3718024 (1973-02-01), Vitelli
patent: 3720544 (1973-03-01), Entringer
patent: 3865153 (1975-02-01), Vitelli
Combs E. M.
Mehr Milton S.
Morgan Construction Company
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