Process and installation for protecting a solid metal against oxidation during rolling
AssigneeL'Air Liquide
InventorsJean-Michel Naud, Gilles Vernet, Albert-Gilbert Goursat, Bruno Wagner
Life of this patent
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Abstract
A process and an installation for protecting a solid metal against oxidation during a rolling operation. This installation comprises inert atmosphere enclosures supplied with an inert gas and enclosing the waiting table, in the case where the rolling is carried out by means of a strip train, or located on each side of pressure rolls around blanks to be rolled, when the rolling is carried out by means of a planetary rolling mill.
Claims11
An installation for protecting a solid metal blank against oxidation during a rolling operation, the installation comprising, in combination:
- a rolling stand disposed along the path of travel of the blank to be rolled;
- means for advancing said blank along said path through said rolling stand;
- an enclosure located along said path upstream of the rolling stand, said blank being advanced along said path through said enclosure;
- a plurality of inert gas distributing chambers located within said enclosure in position to direct inert gas toward said blank at a plurality of spaced points along the path of travel of said blank, said gas distributing chambers providing successive reductions in pressure of the inert gas prior to the time it reaches said blank and producing an ejection velocity of the gas below about 0.5 m/sec;
- and
- means for injecting inert gas into the gas distributing chambers within said enclosure.
An installation for protecting solid metal blanks against oxidation during a rolling operation, the installation comprising, in combination:
- a rolling stand disposed along the path of travel of successive blanks to be rolled;
- means for advancing said blanks along said path through said rolling stand;
- an enclosure located along said path upstream of the rolling stand, said blanks being advanced in succession along said path through said enclosure;
- a plurality of inert gas distributing chambers located within said enclosure in position to direct inert gas toward a blank therein at a plurality of spaced points along the path of travel of said blank, each of said inert gas distributing chambers including an expansion chamber defining a first slot and an additional chamber communicating with said expansion chamber through said first slot and defining a second slot, said gas distributing chambers providing successive reductions in pressure of the inert gas prior to the time it reaches said blank and producing an ejection velocity of the gas below about 0.5 m/sec;
- and
- means for injecting inert gas into the expansion chambers in each of the gas distributing chambers within said enclosure, the injected gas flowing from each said expansion chamber through the corresponding first slot into the additional chamber and then through the corresponding second slot toward said blank.
A process for protecting a solid metal blank against oxidation during a rolling operation, the process comprising, in combination:
- advancing the blank to be rolled in a planetary rolling mill through a rolling stand;
- passing said blank through an enclosure upstream of the rolling stand;
- injecting inert gas into said enclosure and toward said blank at a plurality of spaced points along the path of travel of said blank;
- and
- progressively increasing the rate of injection of the inert gas at successive injection points along said path of travel and maintaining the rate of injection of the inert gas below about 0.5 m/sec.
Dependencies are inferred from the claim text.