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5074 results about "Rolling mill" patented technology

Method for controlling planeness of cold-rolling strip steel

The invention discloses a method for controlling the planeness of cold-rolling strip steel, which comprises the following steps of: carrying out planeness feed-forward control, planeness feedback control and coordination control between both; detecting the cross-section shape and the planeness of a hot rolling incoming material, and actually-measured rolling technological parameters of each frame in real time based on a profiler configured on a No. 1 frame inlet, wherein the parameters comprise rolling force actually-measured values and plate shape adjusting mechanism actually-measured values, and carrying out the feed-forward control on the planeness of each frame outlet; and actually measuring the planeness of the cold-rolling strip steel based on a plate shape roller configured on an outlet of a cold rolling mill, and intensively carrying out the feedback control on the planeness of a final frame outlet. The method can eliminate the influences of the cross-section shape and the planeness of the hot rolling incoming material and fluctuations of the rolling technological parameters on the planeness of the final frame outlet to improve the planeness quality of the cold-rolling strip steel on the one hand, and can automatically control the planeness of each frame outlet, reduce incidence of abnormal conditions, such as fracture surfaces, deviation and the like, and improve the stability in the production process of tandem cold strip rolling on the other hand.
Owner:BAOSHAN IRON & STEEL CO LTD

Integrated control method of cold-rolling strip steel flatness and lateral thickness difference

The invention discloses an integrated control method of cold-rolling strip steel flatness and lateral thickness difference, comprising: moderately and mainly controlling the shape of the strip steel section on the upstream rack of a cold-rolling mill, and mainly controlling strip steel flatness on the downstream rack; based on a profiler configured on a No.1 rack inlet of the cold-rolling mill, actually measuring and hot rolling incoming material section shape and flatness and rolling technological parameter measured values of each rack, wherein the rolling technological parameter measured values comprise rolling force and a plate shape regulating mechanism measured value; actually measuring the cold-rolling strip steel flatness on the basis of a shape meter configured on the cold-rollingmill outlet; performing feed-forward control to the shape of the strip steel section by taking the upstream rack, in particular the No. 1 rack as a key point; and performing feedback control to the strip steel flatness by taking the downstream rack, in particular an end rack as a key point to realize integrated control to the cold-rolling strip steel flatness and lateral thickness difference. Theinvention performs integrated coordination control by the strip steel flatness and section shape and reduces cold-rolling strip steel lateral thickness difference on the basis of further improving cold-rolling strip steel flatness quality.
Owner:BAOSHAN IRON & STEEL CO LTD

Control method and control system of tension in the process of rolling periodic variable-thickness strips

A control method and a control system of tension in the process of rolling periodic variable-thickness strips belong to the technical field of rolling. The method comprises the following steps: dividing segments on the rolled pieces, setting front and back tension values in each zone, realizing tension open-loop control and tension closed-loop control based on maximum torque limit and adding a dynamic torque compensation link and a mechanical friction torque compensation link; controlling torques of an uncoiler and a coiling machine motor and setting speed. 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.
Owner:NORTHEASTERN UNIV

Method for manufacturing foamed aluminum sandwich plate

ActiveCN101905326AUniform structureHigh shape precisionSilicon alloySandwich board
The invention relates to a method for manufacturing a foamed aluminum sandwich plate, which belongs to the field of porous foam metal and laminar composite materials. The method comprises the following steps of: uniformly mixing aluminum-silicon alloy powder prepared by an atomization method, and foaming agent titanium hydride powder and metal magnesium powder in a certain ratio; filling the powder into a thin-wall steel (or aluminum alloy) tube with one sealed end; sealing the other end of the tube after powder filling and preparing a rolled blank; rolling and compounding at a slow speed on a cold rolling mill; trimming an obtained composite plate and cutting a foamed preformed blank according to the size of a foaming mold; foaming the preformed blank in a steel mold in a limited way; adjusting foaming temperature and foaming time as required; and foaming at a high temperature for a short period of time to obtain a high-quality foamed aluminum sandwich plate with a uniform foam structure in a core layer, good interface bonding, high thickness accuracy and excellent plate profile. The method has the outstanding characteristics of low equipment requirement, high plate profile accuracy of a product, high three-point bending strength and the like and is advantaged technology suitable for mass industrial production of foamed aluminum sandwich structural materials.
Owner:NORTHEASTERN UNIV

Method of sheet billet continuously casting and rolling to produce thin strip steel coil

A method of using thin plate adobe continuous casting and rolling to producing thin band steel coil is provided, which belongs to rolling metal at once after continuous casting, in particular relating to thin standard band steel production method. The invention is characterized in that: a conticaster, a swing shear, a roller-hearth type heating furnace, a scale breaker, a vertical miller, 7 mill groups, laminar flow cooling device and reeling machine are connected to a CSP produce line, the produce line adopts reasonable temperature system, rolling equipment, rolling way and combining with cooling after rolling, the molten steel after continuous casting is a casting adobe of 50 to 70mm thick and 900 to 1300 wide, after cutting, heating, scale breaking, proceed continuous rolling to form a thin band of 1.2 to 1.5mm thick and 900 to 1300 wide, then after cooling to reel steel coil. The production flow is short, the equipment is few, the investment is less and the running expense is low; The technics and equipment is reasonable and high efficient, double locomotive and double flow casting, heating by two furnaces, seven rolling machines roll continuously, the production is smooth and saves energy with high production efficiency; the product performance is even and stable, the board shape is regular with high accuracy and good surface quality.
Owner:MAANSHAN IRON & STEEL CO LTD

Centrifugal composite modified indefinite chilled cast iron roller and preparation method thereof

InactiveCN101177759AFine structure of roll bodyEvenly distributedRollsMetal rolling arrangementsCrazingImpurity
The invention relates to a centrifugal combined indefinite chill cast-iron roller and a preparation method thereof, pertaining to steel rolling technical field. The chemical composition of a roll barrel is (weight percent): 3.2-3.8 C, 3.8-4.5 Ni, 1.2-1.8 Cr, 0.2-0.4 Mo, 0.2-0.5Cu, 1.0-1.8 Si, <0.8Mn, 0.10-0.30 Nb, 0.05-0.20 V, 0.05-0.20 Ti, 0.04-0.07Mg, 0.02-0.05 Y, 0.01-0.03 Sb, and the rest are Fe and unavoidable microimpurity. The invention employs a electric stove to produce a roller, and the roller is moulded with centrifugal casting method; the roller is characterized by high strength and hardness, good toughness, hardness uniformity and hardenability, excellent wear resistance and oxidation resistance and the anti-cold shock and heat shock properties are also good; no phenomena like breaking, peeling, crazing and steel sticking are in the operation process; the service performance is apparently better than high nickel-chrome indefinite chill cast-iron roller; the processing technique is simple, high-heat treatment is not needed and the production cost is low. The invented roll has the advantages that: the rolling mill operating rate is significantly improved, the production cost of mill bar is reduced, the surface quality of the mill bar is improved and the economic and social benefits are good.
Owner:BEIJING UNIV OF TECH

Method for producing ferritic stainless steel bands with roughened surfaces through cold continuous rolling

A method for producing ferritic stainless steel bands with roughened surfaces through cold continuous rolling comprises that (1), a five-rack serial type cold continuous rolling is performed, a five-rack serial type cold continuous rolling unit is adopted, the diameter of a working roll of each rolling mill is 300-500mm, and endless rolling is performed; the roughness degrees of the rolls of the first rack to the fourth rack are in a range of 0.5-1.0mum and decrease sequentially; the working roll of the fifth rack is subjected to roughening and chromium plating treatment; an emulsion lubrication rolling mode is adopted, the temperature of an emulsion is 50-60DEG C, the emulsion is sprayed to roll gaps for cooling and lubricating, the temperature of cold-rolled band steel is controlled below 150DEG C; the accumulated reduction rate of the first rack to the fourth rack is larger than 60%, the reduction rate of the fifth rack is in a range of 4-10%, and the roughness of the cold-rolled band steel is controlled in a range of 0.5-1.0mum; (2), the cold-rolled band steel is subjected to annealing acid picking treatment, heating and annealing are performed in a continuous horizontal gas furnace, the annealing temperature is in a range of 800-1000DEG C, and recrystallization of the band steel is finished; finished surfaces are obtained finally through electrolytic picking by Na2SO4 and H2SO4 solutions and soaking picking by a nitric acid and hydrofluoric acid mixed acid solution sequentially after annealing.
Owner:BAOSTEEL DESHENG STAINLESS STEEL

Cold rolling manufacture method of copper and aluminum composite plate strips

The invention discloses a cold rolling manufacture method of copper and aluminum composite plate strips. The cold rolling manufacture method comprises the following steps that: 1, a copper plate and an aluminum plate are subjected to homogenization annealing treatment; 2, surface treatment is carried out: firstly, the copper plate and the aluminum plate subjected to the homogenization annealing treatment are subjected to soaking degreasing, then, the copper plate and the aluminum plate subjected to the soaking degreasing are taken out for drying, and next, the composite surfaces to be rolled of the copper plate and the aluminum plate are ground by a stainless steel wire brush; 3, the copper plate and the aluminum plate are subjected to cold rolling compounding by a cold rolling mill, so copper and aluminum composite plate blanks are obtained; and 4, the copper and aluminum composite plate blanks subjected to the cold rolling are subjected to the diffusion annealing treatment. The cold rolling manufacture method has the advantages that through improving the cold rolling process operation and the process parameters, the copper plate and the aluminum plate are subjected to full diffusion and chemical reaction on the composite surfaces in the manufacture process, so the transition structure with excellent performance is obtained at the composite surfaces, and the bonding intensity of finished products is effectively improved.
Owner:HONGGUANG ELECTRIC GROUP CO LTD

Dynamic roll gap compensation method during cold continuous rolling flying gauge control

ActiveCN103286142AImprove setting accuracyReduce head thickness deviationRoll force/gap control deviceAutomatic controlModel system
The invention discloses a dynamic roll gap compensation method during cold continuous rolling flying gauge control and belongs to the technical field of automatic control of cold continuous rolling. The method includes a part of roll gap compensation for a welding gap position at the position of a rolling mill inlet front thickness gauge and a part of roll gap compensation for the welding gap position at the positions of all rolling mill outlet thickness gauges. A roll gap adjustment value is determined by a model system of a process computer to a great degree due to the fact that a large part of AGC functions are not introduced during flying gauge control. Therefore, computational accuracy of the model system can directly affect thickness control accuracy during flying gauge control. A practical inlet thickness acquired by using a practical thickness gauge at the position of the rolling mill inlet front thickness gauge is adopted to replace a raw material thickness to improve initial data accuracy for setting a model, and a set value of a roll gap during FGC is corrected according to calculated deviation between a front steel coil roll gap and a back steel coil roll gap so as to improve setting accuracy of the roll gap. More accurate roll force is acquired in the method of dynamic self-adapting at the positions of all the rolling mill outlet thickness gauges, setting accuracy of the roll gap is improved, and then the roll gap value can be compensated during flying gauge control.
Owner:BEIJING SHOUGANG AUTOMATION INFORMATION TECH +2

Composite metal construction and method of making suitable for lightweight cookware and a food warming tray

A composite metal sheet for use in making lightweight cookware or as a food warming tray comprising a layer of aluminum roll bonded to a layer of stainless steel defining a food-contacting surface on a first side. The food warming tray embodiment also includes a layer of stainless steel mesh roll bonded on a second side. A method of making a composite metal sheet for cookware comprising the steps of: providing a roll pack of ordered layers consisting of (a) a layer of Alclad aluminum, (b) a layer of stainless steel foil, (c) a reusable plate or platen of stainless steel, (d) a layer of stainless steel foil, and (e) a layer of Alclad aluminum; heating the roll pack to a rolling temperature of about 725°-775° F., preferably about 750° F.; and rolling the heated roll pack in a rolling mill at a reduction of 10-20% in one pass to provide two roll bonded composite sheets, the first composite sheet comprising layers (a)-(b) above, and the second composite sheet comprising layers (d)-(e) above with plate (c) being reusable, wherein the plate of stainless steel is stationary relative to the layers of stainless steel foil during rolling as the roll pack passes through the mill, and wherein the plate transfers a bonding pressure to the aluminum and foil layers without tearing or displacing the foil. The method for making the food warming tray includes the addition of a layer of stainless steel mesh applied to the outer surfaces of Alclad aluminum.
Owner:CLAD METALS

Micro-tracking method and system of rolled pieces in the process of rolling periodic variable-thickness strips

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.
Owner:SHENYANG DONGBAO HAIXING METAL MATERIAL TECH

Preparation method for NbTi/Cu multi-core composite superconducting wire with rectangular section

The invention discloses a preparation method for an NbTi/Cu multi-core composite superconducting wire with a rectangular section, which comprises the following steps of: firstly, assembling an NbTi bar, a pure Nb inner pipe and an oxygen-free copper sheath in turn to form an NbTi/Cu composite sheath, sealing an upper end cap and a lower end cap of the NbTi/Cu composite sheath through vacuum welding, and then performing primary extrusion to obtain an NbTi/Cu composite bar; secondly, drawing and scaling the composite bar, and keeping on drawing the composite bar to obtain a hexagonal core rod, and performing assembling for the second time; and thirdly, performing vacuum solder sealing, hot isostatic pressing, secondary extrusion, bar drawing and scaling on the sheath which is assembled in the second time to finally obtain the NbTi/Cu multi-core composite superconducting wire with the rectangular section. The preparation method has the advantages of simple process flow, low preparation cost and good preparation effect, improves the fill factor among windings in the process of coiling a superconducting magnet but simultaneously keeps high critical current density for the wire, and overcomes the defects that the conventional four-high mill or forming roll mill is unevenly stressed, is difficult to process and the like in the rolling process.
Owner:NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH

Duplex stainless steel and manufacturing method thereof

The invention relates to duplex stainless steel. The duplex stainless steel comprises the following chemical components in percent by weight: 0.01-0.08% of C, 0.2-1.0% of Si, 1.5-3.5% of Mn, 19.0-21.0% of Cr, 1.2-2.8% of Ni, 0.08-0.18% of N, less than or equal to 0.5% of Mo, less than or equal to 1.0% of W, less than or equal to 1.0% of Cu and the balance of Fe and inevitable impurities; PREN (Pitting Resistance Equivalent Number) is 20-24, the martensitic temperature Md formed by strain induction is 60-130 DEG C. A manufacturing method comprises the following steps of: selecting vacuum induction smelting in an electric furnace, argon oxygen decarburization (AOD) or electric furnace, argon oxygen decarburization (AOD), external refining and LF (Ladle Furnace) smelting; carrying out die casting or continuous casting on molten steel, controlling the superheat degree to be 20-50 DEG C in die casting, matching with fast cooling, preventing nitrogen from escaping, and controlling the overheat degree to be 20-50 DEG C and the plate blank casting speed to be 0.8-2m/min; and putting a die-casting blank or a continuous casting blank into a heating furnace for heating to 1100-1250 DEG C, preserving the heat for 0.5-1.5 hours, processing the die-casting blank or the continuous casting blank on a forging production line or a hot-rolling mill group to the needed thickness, then carrying out annealing at the speed of 0.5-2.5min/mm and the temperature of 1030-1150 DEG C. The obtained duplex stainless steel has excellent corrosion resistance and TRIP effect.
Owner:BAOSTEEL DESHENG STAINLESS STEEL

Rolling mill hydraulic AGC system and control method thereof

The invention discloses a hydraulic AGC system of a rolling mill, and a control method thereof, and the system is connected to be formed in a manner of double closed loop of an inner-outer loop that is combined by an outer closed loop and an inner single closed loop. A thickness measuring device is taken as a feedback element, a deviation signal of the feedback value of the thickness measuring device and a given thickness value is firstly input into a PID controller which is based on Smith predictor function and then is input into the PID controller in the inner single closed loop, the deviation signals of a position sensor, a pressure sensor, a tension sensor and the feedback value of an speed measuring device are input into the PID controller; the PID controller processes the signals by a control module, and a touch screen HMI device is used for setting and displaying the parameters of the system and operating and monitoring all the steps. As the strategy of the PID controller based on Smith predictor function is introduced in the invention, the feedback and response speed is fast, thus improving the control precision and stability of the system obviously. The system and the method have the advantages of simple installation and debugging, convenient operation and reliable running.
Owner:JIANGSU UNIV OF SCI & TECH

Method for rolling titanium and titanium alloy bar wire bar with three-roller type Y continuous rolling mill

The invention provides a method for rolling of titanium and titanium alloy bar and wire rod with three-roller Y continuous rolling mill. The technical proposal of the invention is as follows that the three-roller Y continuous rolling mill group is used for 6 to 18 pass continuous rolling of heated titanium and titanium alloy bar billet of phi50mm to form bar billet of 30 to 8mm (or hexagonal and triangular structure of 24 to 8mm) or rolling wire billet of phi20 to 8mm. by adopting the method, bar billet of phi50mm can be rolled into bar billet of phi30 to 8mm (or triangular and hexagonal structure) or rolling wire billet of phi20 to 8mm after heated for one time. Compared with the prior methods of multiple fire time casting, swaging, two-roller transverse-arrangement non-continuous rolling and two-roller longitudinal-arrangement continuous rolling, all of which are used for production of titanium and titanium alloy bar or rolling wire billet, the invention not only has the advantages of high efficiency, energy saving, low noise, small occupying and high precision of the size as well as good organization perforation of titanium and titanium alloy bar and wire rod, but also can produce triangular or hexagonal section and other allotype section.
Owner:XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD
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