93results about How to "Improve thickness control accuracy" patented technology

The invention discloses a flow AGC strip thickness control method of a reversing cold rolling mill, which comprises detecting steps of strip thickness and speed at the input and output of the rolling mill, detecting and computating steps of stiffness coefficient of the rolling mill and plasticity coefficient of strip, control steps of precontrolling AGC, monitoring AGC and hydraulic pressure APC in the control of the hydraulic pressure AGC. The invention is characterized in that the flow AGC strip thickness control method of a reversing cold rolling mill, comprises a establishing steps of a mathematical model of the flow AGC control, computating steps of strip theoretical thickness difference at the output of the rolling mill, computating steps of gap compensation regulation of the rolling mill; the cap regulation of delta Sh of the flow AGCregulated by a PI regulator ,is used as the thickness control of the rolling mill, that is, steps of thickness closed ring control of gap compensation of the endocyclic hydraulic pressure AGC of the hydraulic pressure AGC. The invention has real-time thickness compensation without a time delay and is suited to being widely popularized in AGC system of strip single stand reversing cold rolling mill.

A micro-tracking method and a system of rolled pieces in the process of rolling periodic variable-thickness strips belong to the technical field of rolling. The method comprises the following steps: dividing thickness zones, thinness zones and transition zones on the rolled pieces of the periodic variable-thickness strips, setting whether the incoming materials are uniform-thickness rolled pieces or periodic variable-thickness rolled pieces, determining the starting point of rolling, micro-tracking the rolling length in the process of rolling and carrying out tracking correction on the periodic variable-thickness rolled pieces. The system comprises a rolling mill; coiling machines are arranged at both sides of the rolling mill respectively; length-measuring rollers are arranged between the coiling machines and the rolling mill; thickness gauges are arranged at both sides of the rolling mill respectively; coil diameter gauges are arranged on the coiling machines; a rolling force sensor and a hydraulic cylinder are arranged on the rolling mill; tensiometers are arranged below the length-measuring rollers and pulse coders are arranged on the length-measuring rollers; the thickness gauge, the coil diameter gauge, the rolling force sensor, a displacement sensor of the hydraulic cylinder, the tensiometer and the pulse coder are respectively connected with a computer control system.

The invention discloses a thickness controlling method and a control system in periodicity thickness changing strip rolling process, belonging to the technical field of rolling. The method comprises the following steps: zoning on a rolled piece; determining the roll-gap adjusting amount Sff controlled by feedforward thickness; determining the roll-gap adjusting amount Sfd controlled by feedback thickness; determining the roll-gap adjusting amount Slc controlled by zoning length; determining the final roll-gap setting value; sending the final roll-gap setting value into a thickness controlling system; and adjusting the roll gap of a rolling mill by the thickness controlling system. The system comprises the rolling mill; two sides of the rolling mill are respectively provided with a coiling machine, and a length measuring roller is arranged between the coiling machine and the rolling mill; a thickness measuring instrument is arranged between the length measuring roller and the rolling mill; a rolled diameter measuring instrument is arranged on the coiling machine; the rolling mill is provided with a rolling force sensor and a hydraulic cylinder displacement sensor; a tensiometer is arranged below the length measuring roller; one end of the length measuring roller is provided with a pulse coder; the thickness measuring instrument, the rolled diameter measuring instrument, the rolling force sensor and an equal measuring signal all enter a computer controlling system.

The invention provides a hot rolled strip steel rolling force optimal-setting method and relates to the technical field of control of hot rolled strip steel production process. The problem that in the prior art, a laboratory thermal simulation test and rolled steel production actual data are not simultaneously utilized to conduct optimal setting on rolling force is solved. According to the hot rolled strip steel rolling force optimal-setting method, a stress strain curve of a material is measured through a laboratory thermal simulation single-pass test and is regressed into a deformation resistance model in a one-way compression state, then a deformation resistance model coefficient in an actual rolling state is corrected according to actual rolling process parameters for future rolling force setting and calculation, accordingly the setting accuracy of a hot rolled strip steel rolling force model is improved, and overload phenomenon and the like are avoided. The hot rolled strip steel rolling force optimal-setting method is suitable for rolling force setting and calculation under the condition that the actual rolling process data of multiple-pass hot rolled strip steel are obtained when the deformation resistance model for the rolling force mode is obtained through data regression measured through a laboratory heat simulation machine.

The invention provides a preset control method for a thickness flying gauge change of a hot-dip zinc coating. The method comprises the following steps: with a strip steel speed, air knife pressure, and a distance between an air knife and the surface of strip steel as main influence factors and by applying a principal component analysis method, building a thickness preset model of the coating by using a least-square fitting algorithm of a log-log space; carrying out long-term self-adaption adjustment and short-term self-adaption adjustment on the thickness of the coating aiming at the effects of a variable speed, a target thickness and a strip steel substrate thickness on the thickness of the coating existing in the flying gauge change process; and carrying out online updating calculation on thickness model parameters of the coating by using a Kalman filtering algorithm and a smooth filtering algorithm in thickness control, so as to improve the preset accuracy of the model parameters. By adopting the preset control method, the control problems of overlarge thickness deviation of the coating and coating thickness detection lag caused by changes of the target thickness of the coating, the strip steel substrate thickness and the strip steel speed are solved; automatic preset control of the thickness of the zinc coating is achieved; the thickness deviation of the zinc coating is reduced; the thickness control accuracy of the zinc coating is improved; zinc consumption is reduced; the galvanization cost is also saved.

The invention provides a counterflow roller changing method for realizing online roller changing of ESP (endless strip production) finishing mill unit. The method is used for ESP finishing mill unit online roller changing equipment equipped with six racks. During normal rolling production, any five racks are put into operation, and one rack is used as a standby rack. The method adopts a counterflow roller changing strategy and comprises the following steps: (1) collecting and inputting of collecting technology, strip and mill parameters; (2) roller lifting and speed regulation of the roller changing rack Fi; (3) roller speed regulation and roller gap adjustment of the transition rack F (i+1); (4) roller speed regulation and roller gap adjustment of the transition rack F (i+2); (5) adjustment of the transition racks in the upstream of the standby rack Fj; (6) pressing down and roller speed regulation of the standby rack Fj. By control of the roller changing process according to the mathematic model provided by the method, the roller changing efficiency and the roller changing process stability can be improved, the control precision of the product thickness is improved, and the industrial application accuracy requirement can be met.

The invention discloses a roll force parameter self-learning method and device for determining a roll force self-learning parameter adaptively according to attribute of strip steel and a real-time working condition and improving the rolling precision of the strip steel. The method comprises the following steps: acquiring an attribute parameter of to-be-rolled strip steel; determining a first weight coefficient of a rolling model corresponding to the to-be-rolled strip steel according to thickness, width and finish rolling temperature of the to-be-rolled strip steel; determining the hereditaryform of the to-be-rolled strip steel based on the first weight coefficient, heat number, flow number and rolling roller number of the to-be-rolled strip steel as well as time interval, with the prevision strip steel, of the to-be-rolled strip steel; if the hereditary form of the to-be-rolled strip steel is a short hereditary form, determining the roll force self-learning coefficient correspondingto the to-be-rolled strip steel with a self-learning strategy corresponding to the short hereditary form; and if the hereditary form of the to-be-rolled strip steel is a long hereditary form, determining the roll force self-learning coefficient corresponding to the to-be-rolled strip steel with a self-learning strategy corresponding to the long hereditary form.

The invention relates to a cold-rolled steel strip rolling method. A straightening strip head of a straightening machine is arranged in the front of an original rolling-mill housing, a CPC alignment device is arranged on an uncoiler and enables strip materials to enter the rolling-mill housing in an aligned mode for rolling, a main rolling mill is a six-roller rolling mill, an upper middle roller and a lower middle roller of the main rolling mill have an axial horizontal moving function, an upper work roller and a lower work roller have positive and negative roller bending functions, the main rolling mill is additionally provided with an AGC hydraulic screw down control system, and the front portion and the rear portion of the main rolling mill are respectively provided with an X-ray thickness gauge, a vacuum oil removing device, an upper row of air knives and a lower row of air knives. Steel strip pickling undergoes uncoiling preparation, threading rolling, reversible rolling, finished product rolling and coil unloading for rolling of steel strips, the technical problems that work rollers need an original convexity degree, the diameters of the work rollers are difficult to reduce, roller rolling and bending can not be effectively achieved, storage amount of spare work rollers and roller consumption is increased are solved, and the thickness control precision and plate face cleanness are improved.

The invention relates to an overproof control method of the thickness of a head and a tail of a wide and thick plate mill. The overproof control method is achieved by adding an overproof control module which assists the thickness of the head in a wide and thick plate mill L1 thickness automatic control system. The method specifically comprises the steps that a head roll gap compensation factor coefficient modification submodule and a head roll gap direct modification submodule are additionally arranged in the plate mill L1 thickness automatic control system, modification is carried out on a head roll gap in the process of rolling a wide and thick plate, and the control accuracy of the thickness of the head and the tail of the wide and thick plate is greatly improved. By the adoption of the control method, the overproof total length of the thickness of the head and the tail is shortened, the total length is shortened from 1m to below 0.4m, and yield is increased by 1%.

The invention provides a downstream roller replacing method achieving online roller replacing of an ESP finish rolling unit, and the method is used for an online roller replacing device, provided withsix racks, of an ESP finish rolling unit. During normal rolling production, any five racks are put into operation, and one rack is an order-awaiting rack. According to the method, a downstream rollerreplacing strategy is adopted, the method includes the following steps that S1, collecting process, plate strip and rolling mill parameters are collected and input; S2, a roller of the order-awaitingrack Fj is downwards pressed, and the speed adjusting segment is performed; S3, the roller seam and roller speed adjusting segment of a transition rack Fj+1 and downstream racks is performed; and S4,a roller of a roller replacing rack Fi is lifted and the roller speed adjusting segment is performed. According to the controlled roller replacing method, the roller replacing efficiency and the stability of the roller replacing process can be improved, the product thickness control precision can be improved easily, and the industrial application precision requirement can be met.

The invention discloses a rolling pressure setting method of precision rolling phase-change strip steel; and a formula for calculating the impact of temperature on deformation strength is set up by considering the volume fraction of rolled piece austenitic deformation and ferrite deformation, so that the rolling pressure setting precision of phase-change strip steel in a two-phase area and a ferrite area is significantly improved, and the purposes of improving the strip steel thickness control precision and production stability are achieved. According to the technical scheme, because a phase-change volume fraction calculation model in a cosine form and a deformation strength impact calculation formula in a weighted form are adopted in the double-phase area, the deformation characteristic of a rolled piece in the double-phase area can be better simulated, so that the matching with an actual rolling result is very high.

A compensation method for measured thickness of a zinc aluminized layer includes the following steps of: firstly determining a compensation coefficient, obtaining the compensation coefficient through formula transformation and condition setting according to the thickness gauge measured thickness and the actual thickness of a zinc aluminized sheet; secondly determining a compensation coefficient value according to a measured specific value of [mu]u2/[mu]u1 of a pure aluminium zinc sample sheet and a found specific value of [mu]u3/[mu]u1; and finally modifying a first-level computer zinc aluminized layer measured thickness compensation program, and multiplying a d2 of an original zinc aluminized layer measured thickness compensation program by the compensation coefficient value to achieve automatic compensation of the measured thickness of the zinc aluminized layer, wherein the measured thickness is more close to the actual thickness. The method can effectively decrease a thickness gauge measured thickness deviation, and greatly improve the thickness control accuracy of the zinc aluminized sheet, so that the quality pass rate of the zinc aluminized sheet can be increased to 99.6% from 76.4%.

The present invention discloses a monitoring method of optical filter film thickness. Said method includes the following steps: firstly, calculating spectral curve of every monitoring film using central wavelength lambda O as monitoring wavelength; calculating series spectral curve using out-of-centre wavelength as monitoring wavelength; then using conventional extreme indirect monitoring method to plate optical film on substrate; testing the spectral curve of plated filter; comparing the tested spectral curve with analogously-calculated spectral curves to find out most similar spectral curve in the calculated spectral curves, regulating monitoring wavelength and preparing new filter again, repeating the above-mentioned steps until the waveform and transmittance or reflectance indexes spectral curve of filter are reached to indexes of designed requirements.

The invention discloses a rolling method used for rolling strip steel of a reversible mill, which can shorten the length of the worse parts of the thicknesses of the strip steel head and tail and improve the yield rate. Four stages of starting, accelerating, normal rolling as well as decelerating and stopping are comprised in each rolling path; at the beginning of each rolling pass, the automatic control function of the reversible mill is firstly closed and then the reversible mill is started to roll at a minimum rolling speed designed for the reversible mill; when the reversible mill is regulated and pressed down manually, the thickness deviation of the rolled strip steel is cotrolled in the reasonable range, then the automatic control function of the reversible mill is opened, the reversible mill is accelerated to the normal rolling speed to roll. As the manual and automatic operations are combined, the control precision of the thickness of the strip steel head is improved, the length of the worse part of the thicknesses of the strip steel head is shortened, the product yield rate is improved, and the rolling method is mainly suitable for the reversible mill.

The invention provides a zinc coating thickness control method and system based on a time-varying delay deviation correction technology. Firstly, a data modeling method is adopted to model the coating thickness, the influences of production line speed, air knife pressure, knife distances, height and other factors on the coating thickness are predicted, and feedback control is conducted on controlled quantity according to a model predicted value to eliminate the influence of external disturbance on the coating thickness. Meanwhile, according to the characteristics of the galvanization production process, the delay time of measurement of a thickness gauge is accurately calculated, and based on the delay time, the current model predicted value is corrected by adopting a thickness gauge measured value and model predicted value information which are matched with each other to effectively solve the problem that feedback of measurement information is delayed due to large system time variation. In addition, the difference value between discrete inspection test analytical data and an online thickness gauge thickness measured value is introduced to correct a set value of a control objective of the coating thickness, and steady state residual errors of closed-loop control are reduced. The objectives that fluctuation of coating thickness is reduced, the control precision and the pass percent are improved, and excessive zinc consumption is reduced are achieved.

The invention provides a preparation method of an X-ray multilayer film reflector, and belongs to the technical field of multilayer film reflectors. The method comprises the following steps of firstly, determining the periodic thickness of an X-ray multilayer film according to the wavelength and the incident angle of X-rays; then determining the thickness and the periodic number of the multilayerfilm; and conducting alternately depositing on the surface of a substrate by using an atomic layer deposition method to prepare the X-ray multilayer film reflector. According to the preparation method, the periodic thickness of the X-ray multilayer film is small, the X-ray multilayer film reflector with shorter wavelength can be prepared, in addition, the roughness of the prepared multilayer filmis small (which is less than or equal to the roughness of the substrate), the interface among films is clear, and the reflectivity of the multilayer film reflector is high.

The control method of cooling liquid for cold rolling strip steel includes: for the process computer to calculate the cooling liquid flow rate under the rated speed based on the friction and heat conductance in cold rolling; for the process computer to down send the cooling liquid flow rate during rolling; for the PLC to match based on the cooling liquid flow rate and the rolling speed and to apply the matched flow rate as the given value for controlling the valve; and for the PLC to calculate the control degree and opening of the valve, with the control degree being calculated based on the mathematical model. The present invention compensates the effect of pipeline, nozzle and other factors by means of the mathematical model to obtain the practical flow rate value and can raise the control precision of strip steel thickness.