53results about "Vibration control device" patented technology

The invention discloses a method for setting concentration of emulsion in rolling of a five-rack cold continuous rolling unit extremely thin band. The method includes the following steps: (1) collecting characteristic parameters of main devices of a unit and to-be-rolled bands, main rolling process parameters and process lubricating system parameters, (2) defining related process parameters, (3) computing roll bending force and the roll channeling amount, (4) assigning related search process parameters, (6) computing concentration process parameters, (6) computing the search process speed of the highest rolling speed, (7) computing friction coefficients of various racks under the current condition, (8) computing rolling force, rolling power, slip factors, heat slip damage indexes and vibration coefficients of the various racks under the current condition, (9) computing heat convexity degrees of working rollers of the various racks, (10) computing an exit plate shape and the pressing width, and (11) obtaining and outputting the optimum proportion concentration. The steps are executed by a computer. According to the method, the rolling speed can be quickened, the rolling efficiency can be guaranteed, slip, heat slip damage and vibration are avoided, and it is guaranteed that the exit plate shape of the final rack and the pressing width of the roller ends of the working rollers are the smallest.

Work rolls (14, 15) opposed to each other have shafts rotatably supported by upper and lower work roll chocks (12, 13) of a housing (11), a screw down device (20) for applying a predetermined pressure to the upper work roll (14) is provided in an upper portion of the housing (11), screw mechanisms (23, 31) capable of thrusting the work roll chocks (12, 13) in a horizontal direction are provided on an entry side or a delivery side of the housing (11), hydraulic cylinder mechanisms (24, 32) capable of thrusting the work roll chocks (12, 13) in the horizontal direction are provided on the other side, and contraction portions (46) are provided in hydraulic supply and discharge pipes (45) of the hydraulic cylinder mechanisms (24, 32).

The present invention provides a method and an apparatus for controlling a rolling operation, which method and apparatus can carry out a highly accurate control of the edge drop while suppressing surface defects caused by a roll shift. In a six-high rolling mill, the highly accurate control of the edge drop is carried out by combining a working roll shift and an intermediate roll shift. In addition, a shift oscillation and the control of the edge drop by shifting the intermediate roll are carried out during the rolling operation of the working roll. Further, when the amount of the edge drop cannot be fully controlled by the control of the edge drop by shifting the intermediate roll, the control of the edge drop is carried out by shifting the working roll. By this method, the deviation of the edge drop can be controlled to a minimum while suppressing the generation of the defects on the surface of a strip to be rolled as much as possible.

Hydraulic cylinders are provided in a housing so as to be opposed to work rolls and backup rolls. Before a front end portion of a rollable material is engaged between the work rolls, the working oil pressure of the hydraulic cylinders is set at a high pressure value to make a pressing force on roll chocks high. After the rollable material is completely engaged between the work rolls, the working oil pressure of the hydraulic cylinders is set at a low pressure value to make the pressing force on the roll chocks low.

A lower surface cooling box 12 is arranged between transfer rolls 11 on a runout table 3 and an upper cooling box 14 moving freely is arranged at a position corresponding to the cooling box 12 to eject cooling water to the steel strip symmetrically in the vertical direction. The steel strip passes the center of convergence of cooling water from upper and lower surfaces of the steel strip. A water breaking roll 16 is provided elevating freely at least at the outlet side rotating at the same peripheral speed as the transfer rolls and is rotated to lower concurrently with passing of the steel strip top at the cooling apparatus. The upper cooling box is also lowered concurrently to cool the steel strip.

An electromagnetic device (1) for stabilizing and minimizing the deformation of a strip (4) made of ferromagnetic material during its feeding in a system for coating the same strip with molten metal, by applying a distribution of force which is continuous in the direction transversal to the strip regardless of the width thereof. The device comprises first electromagnets and second electromagnets mirroring the first electromagnets with respect to said theoretical pass-line (50) of said strip (4). Each electromagnet includes a core comprising one pole and one feeding coil wound about the pole. The electromagnetic device comprises a connection element (26) made of ferromagnetic material which connects the cores of the first electromagnets (15, 15′, 15″, 15″′) and a connection element (26′) made of ferromagnetic material which connects the cores of the second electromagnets (16, 16′, 16″, 16′). The connection elements (26, 26′) mirror the theoretical pass-line (50) of the strip (4).

A method for vibration damping and shape control of a suspended metal strip is provided. The method includes the steps of: measuring distance to the metal strip by a plurality of non-contact sensors, providing distance measurements; generating a deflection profile based on the distance measurements; decomposing the deflection profile to a number of base shapes; and controlling the deflection profile by a plurality of non-contact actuators. The step of controlling includes providing for each of the base shapes a corresponding combination of force profiles.

The invention provides a method for designing a rolling mill vertical vibration suppression controller based on self-adaptive fuzzy backstepping, which comprises the following steps of: firstly, establishing a four-degree-of-freedom mechanical-hydraulic coupling nonlinear model of rolling mill vertical vibration according to a dynamic principle of a rolling mill vibration system; setting the vertical vibration displacement of the working roll of the rolling mill to be close to zero as a control target according to the condition that the vertical vibration of the rolling mill causes the workingroll to jump up and down; and finally, in combination with a nonlinear model of rolling mill vertical vibration, selecting a proper Lyapunov function, solving a virtual controller, an actual controller and an adaptive law which enable V (t) to tend to zero when t tends to be infinite, and finally obtaining the predetermined performance controller design method for suppressing rolling mill vertical vibration. According to the method, the rolling mill vertical vibration nonlinear model more conforming to the actual working condition is established, the characteristic that the servo valve has adead zone and the limitation on roller vibration displacement are considered, the rolling mill vertical vibration suppressor is designed, vertical vibration occurring in the high-speed rolling processis rapidly and actively suppressed, and the stability of the high-speed plate and strip rolling process is guaranteed.

The invention relates to a reduction schedule setting method of a cold continuous rolling unit taking vibration abatement as a target and belongs to the field of rolling. The method comprises the following steps of collecting unit associated parameters and strip-rolling process parameters; defining vibration judging indexes of racks; giving a reduction schedule taking vibration abatement as the target to optimize an initial set value of a target function comprehensively; setting the reduction schedule; calculating bit angles of the racks, the inlet speeds and oil film thicknesses of strip steel of the racks, friction coefficients between working rollers of the racks and the strip steel and the neutral angles of the racks; calculating the vibration judging indexes of the racks; and by taking the minimum mean square errors of the rolling mill vibration judgment index optimum value and rolling mill vibration judging index values solved in an actual rolling process and the minimum value ofthe maximum rolling mill vibration judgment index values of the racks as the optimized target function and by taking a lower threshold value of the vibration judgment index solved as a rolling process is in a sub-lubricated state when the neutral angle is as half as the bit angle as a constraint condition, optimizing the reduction schedule of the rolling process of the cold continuous rolling unit finally.

A method for setting a rolling mill, the method being executed before reduction position zero point adjustment or before the start of rolling, and including: a first process of setting rolls in an open state, and with respect to each of the upper roll assembly and the lower roll assembly, adjusting positions of roll chocks in a rolling direction based on a torque acting on the work roll or a vertical roll load difference; and a second process of, after the first process, setting rolls in a kiss roll state, measuring a vertical roll load in two rotational states on a work side and a drive side, and moving roll chocks of a roll assembly on the opposite side to a reference roll simultaneously and in a same direction so that the vertical roll load difference falls within an allowable range to thereby adjust the positions of the roll chocks.

The invention discloses an anti-disturbance control method for a vertical reduction system of a rolling mill under typical working conditions, which comprises the following steps of: under the condition of considering unknown model parameters and execution dead zone of a servo valve, using an anti-disturbance controller combining adaptive parameter estimation of an exponential reaching law and a backstepping control method to split the dead zone into a linear function and a piecewise function; and deducing an anti-disturbance controller capable of dealing with unknown system structure parameters and unknown asymmetric dead zones. Simulation shows that the controller can effectively restrain disturbance caused by sudden load change to a rolling mill screw-down system in the rolling process while guaranteeing the closed-loop stability of the system; and the anti-disturbance control method has important significance on high-precision rolling of plates and strips.

The invention relates to a roll stand (2) for rolling, in particular cold-rolling metal products, comprising at least one actuator (16) which can be actuated for actively damping vibrations in the roll stand (2), and at least one support roll (10), which is non-adjustable or can be adjusted exclusively via an adjuster for pass line adjustment (13) of the roll stand (2), for supporting a working roll (5) and/or intermediate roll of the roll stand (2), wherein the support roll (10) is guided at the ends via a respective bearing unit (11) on a rack (8) of the roll stand (2). According to the invention, in order to permit an optimal active damping of vibrations in a roll stand (2) of this type with low constructive effort, the support roll (10) is supported on the actuator (16) via at least one bearing unit (11), and the actuator (16) is supported on a section (17) of the rack (8) either directly or indirectly via at least one component (14) of the adjuster (13).