摘要:
Rolling stand (10) for plane products and method to control the planarity of said plane products, said rolling stand comprising a pair of working rolls (11a, 11b), a corresponding pair of back-up rolls (13a, 13b) and at least an intermediate roll (15a) located between one of said working rolls (11a) and a corresponding back-up roll (13b), axial translation means (16) and bending means (17) being associated with at least one of said working rolls (11a) to translate it axially and respectively bend it, crossing means (19) being associated with said intermediate roll (15a) to arrange it with its longitudinal axis (25a) inclined, that is, rotated, with respect to the longitudinal axes (21a, 21b, 23a, 23b) of said working rolls (11a, 11b) and of said back-up rolls (13a, 13b).
摘要:
Method to control the planarity of flat products rolled with a rolling stand (10) having a pair of working rolls (11a, 11b), a corresponding pair of back-up rolls (13a, 13b) and at least an intermediate roll (15a) placed between one of said working rolls (11a) and a corresponding back-up roll (13b), axial translation means (16) and first bending means (17) associated with at least one of said working rolls (11a) to translate it axially (WR shifting) and respectively bend it (WR bending), crossing means (19) associated with said intermediate roll (15a) to arrange it with its longitudinal axis (25a) inclined (IR crossing), that is, rotated on a horizontal plane, with respect to the longitudinal axes (21a, 21b, 23a, 23b) of said working rolls (11a, 11b) and of said back-up rolls (13a, 13b), and second bending means (20) associated with said intermediate roll (15a) to bend it with respect to the horizontal plane (IR bending), said method providing a first static setting step, operating selectively at least on WR shifting and on IR crossing, and at least a second dynamic setting step, that is to say, during rolling, operating selectively at least on WR bending and IR bending.
摘要:
Method and device to control the axial position of slabs emerging from a continuous casting machine, providing to control the axial position of the slab (24) in correspondence with the inlet to the first rolling stand and to act in feedback on means to modify the correct position of the axis (32) of the slab (24) in a position located between the first rolling stand and the foot rolls (26) of the ingot mold (13) from which the slab (24) emerges, wherein alignment means operating inside the furnace (15) are employed to induce a controlled lateral displacement governed by the control of the axial position of the slab (24).
摘要:
Method to control the profile of a strip (13) in a rolling stand for strip and/or sheet comprising at least two working rolls, respectively upper (11a) and lower (11b) and defining a reference pass-line (15) substantially coinciding with the center line of said strip (13), said rolls (11a, 11b) defining between them a transit gap (12) through which said strip (13) passes and is rolled and being supported at the ends by respective chocks, said method providing the axial movement (shifting) of said working rolls (11a, 11b) with respect to said pass-line (15), said working rolls (11a, 11b) having a shaped surface profile (14) which can be expressed by a polynomial equation, said method providing to apply a first value (“s1”) of axial translation, or shifting, to said upper working roll (11a) and a second value (“s2”) of axial translation, or shifting, to said lower working roll (11b), s1 being ≠s2.
摘要:
Device for the axial shifting of rolling rolls in a rolling mill stand of a four-high type for the production of strip and/or plate, the stand being equipped with means for the reciprocal cross-over displacement of the processing rolls (10) on a plane parallel to the rolling plane, each roll (10) being borne on relative chocks (11) associated with stationary housings (12), a shifting jack (24) being included and being anchored at one end to a stationary housing (12) and at the other end to an erection element (31), jaw means (15) being included for the temporary clamping of the erection element (31) to a chock (11), the engagement surfaces of the jaw means (15) cooperating in the engagement position (15a) with engagement means included at least on the sides of the chock (11), these latter engagement means being conformed as a sliding element (28) having at least a first position and a second position in relation to the engagement surfaces (29, 30) of the jaw means (15), these first and second positions depending on the aligned and/or inclined position of the roll (10) in relation to its initial longitudinal axis (19), the engagement surfaces (29, 30) of the jaw means (15) being conformed as an arc of a circumference the centre of which (32) lies on the median plane of the relative rolling roll (10).
摘要:
Device for the crossed displacement of rolling rolls, whether they be processing rolls (12) and/or back-up rolls (13), in a rolling mill stand (10) to produce plate and/or strip, the device including an upper rolling block (11a) and a lower rolling block (11b), the processing rolls (12) and back-up rolls (13) cooperating at the ends with respective supporting chocks (14), which in turn cooperate with respective stationary housing 15) in cooperation with at least one side of at least one chock (14) with at least one means of motion transmission (20) comprising guide and positioning cradle means (18), actuation means (24) and motor means (25) with the motor means (25) governed by a control unit (26).
摘要:
Method and device to guide the strip between the stands in a rolling mill finishing train to roll thin strips of a final thickness in the order of 1.2 mm and less, the inter-stand device including at least a guide device arranged at the outlet of the upstream stand (11a), a looper unit (15) comprising at least a looper roller (20) and a guide device arranged at the inlet to the downstream stand (11b), the looper roller (20) having at least a lowered position at the step before the leading end of the strip enters and a plurality of raised positions, while the strip is passing through, to form the desired loop, the looper roller (20), at least when it is in the lowered position before the strip enters, being made to rotate at a tangential speed at least equal to the speed at which the strip is fed between the stands. The looper unit (15) comprises an empowered drive (21) associated with the looper roller (20) at least when the looper roller (20) is in its lowered position, the drive (21) being structured to make the looper roller (20) rotate, before the strip enters, at a tangential speed at least equal to the speed at which the strip is fed between the stands.
摘要:
Block to provide curvature and balancing, which is suitable to impart an "IN" or "OUT" pre-curvature to processing rolls (11) of a four-high rolling mill stand (12) comprising a pair of processing rolls, lower (11a) and upper (11b) rolls respectively, each of which cooperates with a relative back-up roll (13a, 13b), the processing rolls (11a, 11b) and back-up rolls (13a, 13b) cooperating at their two ends with respective chocks (15a, 15b) and (16a, 16b) and relative bearings, the block comprising at least one lower rib (18a, 118a) and one upper rib (18b, 118b) including on their respective inner surfaces curvature jack means (20, 120) cooperating with the opposite surfaces of the chocks (15) of the processing rolls (11), supporting jacks (14) being included and cooperating with the chocks (16a, 16b) of the back-up rolls (13a, 13b), at least one rib (18) including on its outer surface compensation jack means (21, 121) which are actuated when an "OUT" pre-curvature is imparted to at least one processing roll (11) associated with the block (10), the compensation jack means (21, 121) acting on the chocks (16) of the corresponding back-up roll (13).
摘要:
A method to eliminate the play between the chock (13) and the support element (16) in four-high rolling stands (10), the rolling stand (10) comprising working rolls (12) and back-up rolls (11) assembled on respective chocks (13, 14), support blocks (16) to support the chocks (13, 14) and a stationary housing (15), the support blocks (16) to support the chocks (13, 14) and a stationary housing (15), the support blocks (16) being arranged between the uprights of the stationary housing (15) and the relative chocks (13, 14) and supporting means for the crossover lateral displacement of the rolls (11, 12), the stand (10) also comprising transmission means to transmit a thrust (19) acting on the upper chock (13) and contrasting the rolling thrust (20), the method providing to define the value of the inward flection of the uprights of the housing (25) according to the value of the rolling thrust (20), to define the entity of play (21) resulting, with the uprights (15) in this condition of flection, between the chock (13, 14) and relative support block (16) during the crossover movements of the chocks (13, 14), and to displace at least one support block (16) towards the relative chock (13, 14) so as to minimize the play (21) to a desired value at least during the rolling passes. A device to achieve the above method.
摘要:
A bending block for a four-high rolling stand comprising working rolls (11a, 11b) and back-up rolls (12a, 12b) associated with respective chocks (14a, 14b; 15a, 15b), the stand also comprising a stationary housing (16) associated with means (17) for the crossing of the rolls, the working rolls (11a, 11b) being able to be translated axially. The crossing means (17) cooperating with the outer lateral faces of the chocks (14a, 14b) at least of the working rolls (11a, 11b) by means of intermediate plates to distribute the thrust. There also being included bending jacks to bend at least the working rolls (11a, 11b ), the intermediate plates to distribute the thrust consisting of gibs (18) shaped like a vertical plate (19) with at least two fins (20, 21) orthogonal to the vertical plate (19), the two fins (20, 21) being arranged on one side and the other astride a fin extension (114) of the chock (14) of the relative working roll (11), the two fins (20, 21) defining the respective positioning seating (23) for the bending jacks (24a, 24b). There also being included between the crossing means (17) and the relative gib (18) a containing and guiding plate (25).