Plant to control the section area of a rolled product and corresponding method
AssigneeDanieli Automation S.P.A.
InventorFerruccio Della Vedova
Life of this patent
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Abstract
A plant to control the section of a rolled product passing through a rolling train comprises at least two rolling stands, at least a section area measurer disposed immediately at exit from at least one of the stands located downstream of the first stand, a control unit comprising a database, in which at least the parameters relating to the expected value of the section of the rolled product at exit from each stand are memorized, means to compare the values detected by the section area measurer with the values memorized in the database and means to act on the rolling parameters according to said values detected.
Claims11
Plant to control the section area of a rolled product (12) passing through a rolling train (30) comprising at least two rolling stands (11a, 11b, 11c, 11d) equipped with rolling rolls (18), used in particular for products with a section from 70 mm and more, characterized in that it comprises:
- a section area measurer (10) disposed immediately at exit from at least one of the even stands (second, fourth, sixth, etc.) located downstream of the first stand (11a) and configured to measure the section area of a round profile;
- a control unit (20) comprising a database (21), in which at least the parameters relating to the expected value of the round section of the rolled product (12) at exit from each stand are memorized, and comprising means to compare the values detected by the section area measurer (10) with the values memorized in said database (21);
- wherein, in the event of dissimilarity between the above-mentioned values, said control unit (20) comprises means to act on at least the motors (14) associated with said rolling rolls (18) in order to vary the rotation speed of said rolling rolls (18) so as to modify, either to increase or decrease, the drawing action or thrust between at least two of said stands (11a, 11b, 11c, 11d) so as to return the value of the section of the rolled product (12) to the expected value.
Plant as in any claim hereinbefore, characterized in that a device (23) to control the characteristics of the rolled product (12) arriving at a rolling stand is associated with said control unit (20).
Method to control the section of a rolled product (12) in a rolling train (30) comprising at least two rolling stands (11a, 11b) equipped with rolling rolls (18), used in particular for rolled products (12) with a diameter from 70 mm and more, characterized in that it comprises:
- a first step in which a section area measurer (10), disposed at exit from at least one of the even stands (second, fourth, sixth, etc.) located downstream of the first stand (11a), detects the size of the section area of the rolled product (12) exiting from the corresponding rolling pass;
- a second step in which a control unit (20), comprising a database (21) in which at least the parameters relating to the value of the section area of the rolled product (12) at exit from each stand are memorized, compares the values detected by the section area measurer (10) with the values memorized in said database (21);
- a third step in which, in the event of dissimilarity between the above-mentioned values, said control unit (20) acts on at least the motors (14) associated with said rolling rolls (18) in order to vary the rotation speed of said rolling rolls (18) so as to modify, either to increase or decrease, the drawing action or thrust between at least two of said stands (11a, 11b) so as to return the value of the section to the expected value.
Method as in any claim from 6 to 9, characterized in that it provides that in said database (21) values of the section area of the rolled product (12) at exit from at least some of the rolling stands (11a-11d) are memorized, in relation to one or more of its temperature, speed or diameter.
Dependencies are inferred from the claim text.