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US 4,415,976 AGranted
Method and apparatus for automatic mill zero correction for strip width
AssigneeWestinghouse Electric Corp.
InventorJohn W. Cook
Life of this patent
Estimating the term…
Abstract
The change in the mill modulus of the stand of a rolling mill due to the particular strip width of a run strip of material is taken into account by reference to the unloaded mill modulus of the stand and a desired roll gap opening is calculated on the basis of an error relative to the actual roll gap opening in order to achieve a desired strip thickness setting.
Claims19
A method of presetting the roll stands of a rolling mill comprising the steps of:
- closing the roll gap of a roll stand until a desired roll force RF is developed between the rolls;
- determining the actual mill stretch RF/M.sub.1 of the empty mill modulus for said desired roll force at said stand;
- determining for said desired roll force the actual mill stretch RF/M.sub.2 of the mill modulus at said stand if loaded with a strip of material of a given width;
- calculating the quantity .DELTA.S=(RF/M.sub.1 -RF/M.sub.2);
- determining for a desired strip thickness DT a desired roll gap opening H.sub.1 by the relation H.sub.1 =DT-(S.sub.1 -S.sub.0), where S.sub.0 is the separation of the rolls when the mill is empty and S.sub.1 is the separation of the rolls when the mill is loaded;
- and
- opening the roll gap of said stand by an amount sufficient to reach said desired roll gap opening.
4 more elements
Apparatus for inwardly presetting the roll stand so of a rolling mill comprising:
- means for closing the roll gap of a roll stand until a desired roll force RF is developed between the rolls;
- first means for deriving the actual mill stretch RF/M.sub.1 of the empty mill modulus for said desired roll force;
- second means for deriving the actual mill stretch RF/M.sub.2 of the mill when loaded with strip material in relation to the loaded mill modulus at said stand for said desired roll force means for calculating the quantity (RF/M.sub.1 -RF/M.sub.2);
- third means for estimating a desired roll gap opening H.sub.1 from the amount of a desired strip thickness .DELTA.T less (RF/M.sub.1 -Rf/M.sub.2);
- and
- means for opening the roll gap of said stand by an amount sufficient to reach said estimated desired roll gap opening.
3 more elements
Dependencies are inferred from the claim text.