Search International and National Patent Collections
Some content of this application is unavailable at the moment.
If this situation persists, please contact us atFeedback&Contact
1. (WO1998051423) TWO STAND TANDEM FOR ROLLING LINE
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

CLAIMS
1 - Tandem with two reversible four-high rolling stands (14a, 14b) for the cold rolling of thin strip up to 0.18 mm, advantageously from 0.18 to 1.2 mm, comprising at least a first (12a) and a second (12b) drawing reel, heating means and means to maintain the temperature of the rolls and means to heat and maintain the temperature of the lubricating oils, a control and command unit, a first, usual lubrication system (17), the back-up rolls (16) being associated with brackets (26) which transmit motion, the working rolls (15) being associated with replacement rolls (115), the working rolls (15) and the replacement rolls (115) being alternately and functionally operating, the stands (14a, 14b) including a first working condition with the working rolls (15) and at least a second working condition with the replacement rolls (115), wherein below the stands (14a, 14b) there is a first (20a) and a second (20b) collection tank to collect the lubrication fluid, the tandem being characterised in that there is a second finishing lubrication system (18) which can be activated in alternation with the first system (17), the first (20a) and second (20b) collection tank being equipped with switching means (21) whose relative command means (22) are controlled by the command and control unit

(31), each of the switching means (21) being equipped with at least two ways (30a, 30b) which can be activated in alternation, a first (28a) and a second (28b) containing reservoir tank cooperating respectively with a first (24a) and a second (24b) circulation pump, each of the pumps (24a, 24b) feeding the respective first (17) and second (18) lubrication system.
2 - Tandem with two stands as in Claim 1, in which the first (17) and second (18) lubrication systems, with the command and control unit (31), are functionally associated - Ir ¬

respectively in the first working condition with the working rolls (15) and in the second working condition with the replacement rolls (115).
3 - Tandem with two stands as in Claim 1 or 2 , in which the working rolls (15) and the replacement rolls (115) are associated with sliders whose actuators (37) are governed by the command and control unit (31) .
4 - Tandem with two stands as in any claim hereinbefore, in which the containing reservoir tanks (28a, 28b) include means to control the level and means to restore the level (32) governed by the command and control unit (31) .
5 - Tandem with two stands as in any claim hereinbefore, in which the containing reservoir tanks (28a, 28b) include means (33) to control the composition of the lubrication liquid governed by the command and control unit (31) .
6 - Tandem with two stands as in any claim hereinbefore, in which the containing reservoir tanks (28a, 28b) include means (34) to at least partly restore the composition of the lubrication liquid governed by the command and control unit (31) .
7 - Tandem with two stands as in any claim hereinbefore, in which the containing reservoir tanks (28a, 28b) include means (35) to stir and make the concentration of the lubrication liquid uniform, the means (35) being governed by the command and control unit (31).
8 - Tandem with two stands as in any claim hereinbefore, in which the command and control unit (31) governs at least the switching means (21) and the means (34) to restore the composition of the lubrication liquid according to the concentration and the physical/chemical characteristics of the lubrication liquid being obtained, moment by moment, correlated to the rolling step and the operating and technological parameters of the rolling cycle.