98results about "Elongation control device" patented technology

The invention relates to the technical field of copper pipe manufacturing, in particular to a rare earth copper pipe hot rolling and annealing control method which comprises the following steps: adding rare earth elements into a copper melt to prepare a rare earth copper casting blank; initial hot rolling parameters are set according to product performance requirements, and multi-pass rolling is carried out; ultrasonic detection is conducted after each pass of rolling, the sound velocity anisotropy ratio delta V is obtained in real time, and hot rolling parameters of subsequent passes are dynamically adjusted according to the deviation between the measured value of the delta V and the target range; energy storage grades are divided according to the target range, the annealing process of the energy storage grades is matched based on the delta V value after finish rolling, and if the delta V value after finish rolling exceeds the target range, the exception handling mode is activated, and the energy storage grades are matched again; performing performance detection on the rare earth copper pipe after annealing, and triggering a process backtracking instruction if the rare earth copper pipe does not reach the standard; closed-loop dynamic regulation and control of the whole hot rolling annealing process of the rare earth copper pipe are achieved, and the problems of performance fluctuation and too high rejection rate caused by mismatching of technological parameters and the real-time state of materials are solved.

The invention provides a preparation method of a copper target material, and belongs to the technical field of metal target material preparation. According to the preparation method of the copper target material, the copper blank is subjected to hot rolling, thick columnar crystals in an original as-cast structure of the copper blank are crushed into fine grains through hot rolling, and the grain structure is more uniform; and the total volume of gaps among crystal grains is rapidly reduced, an original loose structure is compacted into a compact structure, densification treatment of the copper blank is achieved, and the dislocation density of the copper blank is increased. And then the copper target blank is cooled to 25-40 DEG C and then is subjected to cold rolling, crystal grains in the copper target blank are further rearranged, gaps between the crystal grains are further compressed, the crystal grain structure of the copper target blank is more compact, and the dislocation density is further improved. And finally, a temperature stepped annealing process is adopted, so that internal stress generated in the hot rolling and cold rolling processes can be effectively eliminated, and the hardness of the copper target blank cannot be excessively reduced due to the annealing process.

The invention discloses a preparation method of a titanium-steel composite plate and the titanium-steel composite plate, and belongs to the technical field of metal composite material preparation. The preparation method of the titanium-steel composite plate comprises the following steps: (1) carrying out titanizing treatment on the surface of a pretreated steel substrate to form a titanizing layer, so as to obtain a titanized steel substrate; (2) laminating the titanized steel substrate and the pure titanium plate, pre-pressing, and sequentially carrying out double-pass composite rolling and heat treatment to obtain a titanium steel composite plate; wherein asynchronous isothermal rolling is adopted for the first pass of double-pass composite rolling, and isothermal symmetric rolling is adopted for the second pass of double-pass composite rolling. The preparation method is simple, efficient and low in cost, a uniform and compact titanium layer is formed on the surface of the steel substrate through titanizing treatment, the binding force between the pure titanium plate and the steel substrate is enhanced, and generation of harmful metal compounds is avoided. Meanwhile, the composite rolling technology combining asynchronous isothermal rolling and isothermal symmetric rolling is adopted, and the internal organization structure and performance of the titanium steel composite plate are effectively improved by regulating and controlling rolling parameters.

The invention relates to a preparation method of a thin-specification 550Mpa-grade high-fracture color-coated substrate, and belongs to the technical field of preparation of color-coated substrates. The method comprises the steps that a casting blank with set chemical components is obtained, and the set chemical components comprise a trace amount of Nb; the casting blank is sequentially heated, hot-rolled and coiled, and a hot-rolled plate coil is obtained; the hot-rolled plate coil is sequentially subjected to acid pickling, edge cutting and cold rolling, the unit tension of each pass, the reduction rate of each pass and the total reduction rate of cold rolling are controlled, and a cold-rolled plate coil is obtained; and the cold-rolled plate coil is sequentially subjected to annealing, finishing and hot dipping, and the color-coated substrate is obtained. Through the optimization of the whole-flow process, especially the fine control of key steps such as hot rolling, cold rolling and annealing, the color-coated substrate which is thinner, higher in strength and capable of meeting the elongation requirement is successfully produced under the condition that no Nb alloy is added or only a small amount of Nb alloy is added. The substrate is low in cost, excellent in performance and wide in application prospect.

The embodiment of the invention provides a preparation method of a titanium foil strip with high elongation and good surface microcosmic quality. The preparation method comprises the steps that a sponge titanium raw material is smelted and machined through a primary electron beam cold hearth smelting furnace; the titanium metal plate blank is coated with an anti-oxidation coating to form an anti-oxidation coating; the titanium metal plate blank coated with the anti-oxidation coating is subjected to heating, heat preservation, hot rolling and continuous annealing shot blasting acid pickling treatment; the hot-rolled titanium coil is subjected to first-rolling-process cold rolling, and continuous annealing, shot blasting and acid pickling are conducted after cold rolling; carrying out multi-rolling-process cold rolling and semi-finished product annealing by adopting a cold rolling unit and an argon protection cover type furnace; carrying out finished product rolling on the annealed master tape by adopting a cold rolling unit; performing finished product heat treatment on the titanium strip by adopting an argon shield continuous annealing furnace; and straightening the annealed titanium strip by adopting a tension straightening machine. According to the embodiment of the invention, the titanium foil strip with high elongation and good surface microcosmic quality is obtained, and the prepared titanium foil strip is excellent in forming performance and surface microcosmic quality.

The invention discloses a composite plate hot rolling speed-deformation-pressure coupling control system and method, and the method comprises the steps: building a time-space sequence prediction model through employing a long-short-term memory network based on the hot rolling data of a multi-layer composite plate, predicting the rolling speed, rolling force and deformation, and obtaining the deformation of the multi-layer composite plate according to the deviation between the prediction quality and the target quality. And carrying out feed-forward correction on the roll gap by adopting a multi-target balance optimization algorithm. On the basis of feed-forward correction, the residual error between the actual thickness value and the set outlet thickness is further considered, a roll gap feedback adjustment strategy is designed, and composite plate hot rolling speed-deformation-pressure coupling control is achieved. The composite plate hot rolling speed-deformation-pressure coupling control method is high in control precision, the defects of a traditional method are overcome, speed-deformation-rolling force dynamic coupling control is improved, and the method can be widely applied to multi-layer composite plate hot rolling.

The invention discloses an automatic control system of a hot-rolled strip steel temper mill, relates to the technical field of steel rolling automatic control, and is used for solving the problems of inaccurate material structure control and unstable pressing force in hot-rolled strip steel production. Through multi-dimensional sensing data fusion, accurate regulation and control of tissue transformation are realized based on a phase change kinetic model. And real-time closed-loop adjustment is adopted for pressing force control, and it is guaranteed that rolling force is stable and evenly distributed. The plate shape adjusting module dynamically adjusts the roll bending pressure through the multi-point sensing and hydraulic servo technology, and efficient plate shape correction is achieved. And the elongation module calculates the deformation rate in real time, automatically adjusts rolling parameters and ensures stable strip steel quality. And the feedback optimization module integrates data of each link, realizes multi-module cooperative adjustment by applying an intelligent control strategy, and improves the self-adaptive capability and the operation reliability of the system. According to the whole scheme, precise control and dynamic optimization of the rolling process are achieved, and efficient and stable hot rolling strip steel production is supported.

This invention discloses a short-process bar rolling method and system. The method includes the following steps: S1, heating the billet in a heating furnace; S2, descaling with high-pressure water; S3, completing eight rolling passes in rolling zone one; S4, performing multiple-length segmentation with a first flying shear; S5, performing four rolling passes in rolling zone two; S6, performing multiple-length segmentation with a second flying shear; S7, performing diameter reduction rolling on the bar using a KOCKS mill; S8, a third flying shear; S9, water cooling; S10, cooling; S11, shearing the bar to length; S12, finishing and annealing; S13, magnetic flux leakage testing. This invention can meet the requirements for bar shape and size as well as the requirements for flaw detection, achieving integrated bar heating, controlled rolling and cooling, and flaw detection while saving space. This invention can reduce the number of traditional bar rolling passes, realizing short-process bar production with small space requirements, low power consumption, customization, greenness, and low carbon emissions.

The invention discloses an elongation switching control method when a strip steel welding seam passes through a tension withdrawal and straightening machine. The method comprises the steps that a tension amplitude limiting model with the sectional area of strip steel as an independent variable is established; an interval automatic switching control mode is adopted for the elongation rate of the tension withdrawal and straightening machine equipment; and constructing an elongation switching interval model taking the thickness of the strip steel as an independent variable. According to the invention, the stability of unit operation can be improved, the labor intensity of operators is reduced, and the accident of strip breakage of strip steel welding seam over-tension withdrawal and straightening machine equipment is avoided.

This invention discloses a method for controlling the overall quality of thin-gauge ultra-high-strength steel plates, belonging to the field of steel plate production. It includes the following steps: 1) Heating: The slab is fed into a heating furnace for heating; 2) Rolling: Rolling is performed using a 2-stand roughing mill and a 7-stand finishing mill hot continuous rolling mill; 3) Cooling: After rolling, the slab undergoes three-stage cooling: ultra-rapid cooling, air cooling, and water cooling, followed by coiling after water cooling; 4) Tension straightening: The coiled steel, cooled to room temperature, is sequentially uncoiled, laser-welded, and tension straightened; 5) Pickling: After tension straightening, the strip is pickled using a three-stage continuous hydrochloric acid pickling process; 6) Leveling: After pickling, the strip is rinsed, dried, and then leveled online. This invention effectively improves the overall quality of steel plates and solves the problems of poor surface quality, large fluctuations in mechanical properties, and difficulty in shape control in phase transformation strengthened thin-gauge ultra-high-strength hot-rolled steel plates.

The invention discloses a rolling process capable of improving the flaw detection level of die steel, which specifically comprises the following steps of: charging and heating a continuous casting billet or a steel ingot to a recrystallization temperature, then rolling, charging and heating to the recrystallization temperature again when the rolling temperature is lower than the recrystallization temperature or higher than the lower limit of the recrystallization temperature by 0-15 DEG C, keeping the temperature for 6-8 hours, and continuing rolling; and the operation is repeated until the steel plate is rolled to the required thickness, and then stacking treatment is conducted. The flaw detection grade of the die steel rolled by the method meets the forging grade flaw detection standard SEP1921-84E / e grade, and the percent of pass is greater than 90%.

A rolling control device (10) updates a preset load value Pset based on operation actual results at timings ta to tb. The rolling control device (10) derives a plasticity coefficient Qchk based on operation actual results at timings tb to tc. When the determining that it is necessary to re-update the updated preset load value Pset based on the plasticity coefficient Qchk, the rolling control device (10) updates the preset load value Pset again based on the operation actual results at the timings tb to tc.

The application discloses a rolling force slope setting method of a continuous annealing and skin pass mill, wherein a slope setting, a difference between a lower limit of an elongation setting value and an actual elongation value, a rolling force of a welding seam and a preset rolling force of a current coil are taken as setting inputs of a slope generator; the slope setting is determined according to a yield strength σ s of the strip steel; different slope settings are set according to different conditions; when the welding seam is located at a specified position of an inlet of the continuous annealing and skin pass mill, the slope generator starts a rolling force falling calculation process; and when the welding seam is located at a specified position of an outlet of the continuous annealing and skin pass mill, the slope generator starts a rolling force rising calculation process. The application can guarantee the elongation index of the continuous annealing product and the surface quality of the continuous annealing product.

The invention discloses a high-stability temper mill elongation control method and system, and the method comprises the steps: calculating the inlet and outlet speed values of strip steel in a plurality of modes, and selecting the inlet and outlet speed values of the strip steel from a plurality of speed sources; when the speed source is switched, slope processing is conducted on the speed value of the strip steel, the elongation rate is calculated through the processed speed of the strip steel entering an outlet, and the actual elongation rate value is obtained after amplitude limiting and smoothing processing are conducted; the self-adaptive gain is calculated according to the strip steel width and the inlet thickness set value, the integral controller is adopted to calculate the integral part control rolling force, then the pre-control rolling force is calculated according to the actual speed of the rack, the total rolling force set value is obtained, and high-stability temper mill elongation control is achieved based on the total rolling force set value. According to the method, the accurate actual elongation value can be obtained under the complex working condition, and accurate control over the elongation of the temper mill is achieved through the method that the integral controller with the self-adaptive gain and the pre-control rolling force changing along with the speed are combined.

The application discloses a kind of composite board hot rolling speed-deformation-pressure coupling control system and method, based on multilayer composite board hot rolling data, using long short-term memory network establishes space-time sequence prediction model, and according to the deviation of prediction quality and target quality, using multi-objective balanced optimization algorithm to feed forward correction is carried out to roll gap.On the basis of feed forward correction, the residual between thickness actual value and set outlet thickness is further considered, and a roll gap feedback adjustment strategy is designed, realizing the coupling control of composite board hot rolling speed-deformation-pressure.The composite board hot rolling speed-deformation-pressure coupling control method proposed in the application has high control precision, makes up for the defects of traditional methods, improves the speed-deformation-rolling force dynamic coupling control, and can be widely used in multilayer composite board hot rolling.

The application provides a tempering method suitable for an acid pickling line, comprising the following steps: step S1: calculating actual elongation rate by using a laser speed meter and a thickness gauge to respectively measure the front and rear speed and the front and rear thickness in real time; step S2: performing elongation rate closed-loop control according to the actual elongation rate measured in real time by taking the rolling force as an adjusting amount; step S3: performing compensation on the rolling force to eliminate the elongation rate fluctuation caused by acceleration and deceleration of the unit; and step S4: performing feedforward control by using the thickness deviation measured by the front thickness gauge to suppress the elongation rate fluctuation. The application also provides a tempering system and device suitable for the acid pickling line and a medium. The application realizes the tempering function of high-precision elongation rate closed-loop control by using the last stand in the acid pickling line, widens the use function of the acid pickling line, and improves the surface quality and material performance of the product.

Provided are: a hot-rolled steel sheet temper rolling method capable of performing temper rolling to form a hot-rolled steel strip having a target shape by correcting a shape defect even in the case of a hot-rolled steel sheet having high strength; and a hot-rolled steel strip production method.　The present invention provides a hot-rolled steel sheet temper rolling method for temper rolling a hot-rolled steel sheet by a temper rolling mill, the method including: an acquisition step for acquiring specifications and temper rolling conditions of a hot-rolled steel sheet to be subjected to temper rolling; a calculation step for determining, on the basis of the specifications and the temper rolling conditions of the hot-rolled steel sheet, the elongation rate, the rolling load, and the bender amount at the start of temper rolling and after the start of temper rolling; and a temper rolling step for temper rolling the hot-rolled steel sheet on the basis of the elongation rate, the rolling load, and the bender amount determined in the calculation step. In the calculation at the start of the temper rolling in the calculation step, the bender amount is calculated so as to be within a predetermined proportion with respect to the upper and lower limit values of the device specification of the temper rolling mill, and the elongation rate is calculated so as to be within the range of a lower limit value determined from the shape of the hot-rolled steel sheet before the temper rolling and a predetermined upper limit value, and, in the calculation after the start of the temper rolling in the calculation step, the bender amount is calculated so as to be within the lower and upper limit values of the device specification of the temper rolling mill, and the elongation rate is calculated so as to be within the range of the lower limit value determined from the shape of the hot-rolled steel sheet before the temper rolling and the predetermined upper limit value.

The invention provides a production method for rolling a titanium-steel composite plate, which comprises the following steps: S1, preparing raw materials: preparing two titanium middle plates, two steel billets and a frame, and machining and leveling the two titanium middle plates, the two steel billets and the frame; s2, the surface of the titanium middle plate is coated with an isolating agent; the two titanium middle plates are symmetrically placed between the two steel billets, a frame is arranged on the periphery of each titanium middle plate, a gap G is reserved between the inner side of each frame and the corresponding titanium middle plate, G = min (50, max (25, 0.0072 L + 8.4)), positioning blocks are welded to the head edge and the tail edge of each titanium middle plate, and the positioning blocks are located within the finished product trimming range; s4, heating is conducted; and S5, rolling: when the accumulative deformation is less than or equal to 30%, the single-pass deformation is less than or equal to 15%. Through the synergistic effect of gap containing extension, positioning block play prevention and small rolling reduction control coordination deformation, titanium layer wrinkle-shaped stacking is eliminated, interface full contact is ensured, the bonding rate is remarkably improved, and the problem that the titanium layers are subjected to wrinkle-shaped stacking due to extension blocking in the initial rolling stage, and consequently the interface local contact state is inconsistent is solved.

The invention belongs to the technical field of special-shaped forge piece manufacturing, and particularly relates to a rolling device and method for a hard-to-deform high-temperature alloy high-pressure compressor casing forge piece. The device comprises a base, a workpiece clamping driving mechanism, a core roller, a driving roller and a connecting rod, the workpiece clamping driving mechanism comprises a plurality of stand columns arranged on the base in the circumferential direction, the stand columns can move in the radial direction, the side wall of each stand column is provided with an upper pressing roller and a lower supporting roller which can ascend and descend and rotate around the axis of the upper pressing roller, and the lower supporting rollers are used for lifting ring blanks; the upper compression roller is used for outputting constant pressure above the ring blank; the core roller and the driving roller are rotationally installed on the base and clamped on the inner side and the outer side of a ring blank respectively, the top of the core roller and the top of the driving roller are hinged through a connecting rod, and rotating generatrixes of the core roller and the driving roller are matched with generatrixes of the ring blank and a forge piece from top to bottom respectively. According to the method, the material utilization rate is increased, the machining period is shortened, and the method is suitable for rolling of high-pressure compressor casing forgings made of nickel-based high-temperature alloy and other difficult-to-deform materials.

This invention relates to a method for producing nickel-titanium shape memory alloy foil, comprising: selecting hot-rolled nickel-titanium shape memory alloy sheets with suitable composition, phase transformation temperature meeting requirements, thickness of 2-3 mm, length of 6-7 m, and width of approximately 350 mm; welding traction stainless steel strips to both ends of the hot-rolled nickel-titanium shape memory alloy sheets, and performing multi-pass cold rolling under tension on a four-high mill to obtain nickel-titanium shape memory alloy strip coils with fully broken metallographic structures; subjecting the nickel-titanium shape memory alloy strip coils obtained by tension rolling on the four-high mill to online cleaning, online annealing, online cleaning, surface grinding, and drying; simultaneously welding traction stainless steel strips to both ends of 10 dried nickel-titanium shape memory alloy strip coils on a composite billet; and performing multi-pass cold rolling under tension on the composite billet through a four-high mill to obtain nickel-titanium shape memory alloy foil coils with a thickness of 32-40 μm.

The present invention discloses a method for industrializing the production of cold-rolled low-carbon steel strip for household appliances with limited specifications and controlled by low-pass mill elongation. During the pass mill process, when industrially producing cold-rolled low-carbon steel strip for household appliances with a thickness of 0.5 to 0.6 mm and a width greater than 1500 mm, the elongation control mode is no longer used. Instead, a rolling force and tension control mode is adopted. The rolling force control mode is to control the elongation by varying only the rolling force, while the rolling force and tension control mode is to control the elongation by varying both the rolling force and tension simultaneously. The purpose of the invention is to provide a method for industrializing the production of cold-rolled low-carbon steel strip for household appliances with limited specifications and controlled by low-pass mill elongation. The cold-rolled low-carbon steel strip produced by this method not only effectively eliminates the product yield plateau but also effectively reduces the pass mill elongation, reducing the previously high pass mill elongation to a pass mill elongation that can be achieved on-site, making it suitable for industrial mass production of limited specifications.

The invention relates to the technical field of a carbon steel hot rolling process in the metallurgical industry, in particular to a method for overcoming the defect of incomplete surface descaling in a girder steel hot rolling process by developing a new main descaling ultrahigh-pressure using method, so that the descaling pressure is improved, and oxide scale on the surface of a plate blank is ensured to be thoroughly removed; a fine descaling header height adjusting strategy is innovated, the descaling hitting power is improved, and the descaling effect is further improved; a new rough rolling descaling pass optimization scheme is developed, and the descaling capacity is enhanced; an intermediate billet thickness optimization technology is innovated, and the descaling effect is improved; a novel girder steel component optimization scheme is developed, and the descaling difficulty is reduced; by implementing the method, the girder steel is stable in production in the hot rolling process, meanwhile, the defect of incomplete descaling on the surface after rerolling is fundamentally improved, the defect occurrence rate is remarkably reduced, cutting and rescue operations caused by incomplete descaling are effectively reduced, and the quality loss cost is reduced, so that the contract redemption rate is increased, the overall production efficiency is improved, and the production cost is reduced. And good benefits are obtained.

This invention relates to the field of plate heat exchanger material processing technology, specifically to a method for preparing corrosion-resistant titanium alloy foil for plate heat exchangers. The preparation method includes the following steps: S1, preparing titanium alloy ingots; S2, preparing billets to be rolled; S3, cooling and cold rolling; S4, post-treatment. This invention involves depositing boron oxide powder within micro-etched micropores, and then coating the surface of the titanium foil with a composite liquid of mesoporous ceramic powder loaded with ostinidine. This forms a protective layer with antibacterial and corrosion-resistant properties on the surface of the warm-pressed titanium alloy billet, thereby preventing direct contact between corrosive media and the titanium alloy foil, reducing the corrosion rate. Furthermore, in plate heat exchangers, coating the titanium alloy with this ostinidine-loaded mesoporous ceramic powder solution helps reduce the growth of microorganisms on the surface of the titanium alloy foil, improving the hygienic performance and operating efficiency of the heat exchanger.

The invention provides a brass-aluminum-brass composite material and a preparation method and application of cold compositing of the brass-aluminum-brass composite material, the preparation method comprises the steps that brass, aluminum and brass are subjected to solid-solid cold composite rolling, a first intermediate composite material is obtained, the thickness ratio of the brass, the aluminum and the brass is 1: (1-8): 1, the solid-solid cold composite rolling is single-pass rolling, and the reduction rate of the single-pass rolling is 50%-70%; then diffusion annealing treatment is conducted, the temperature of the diffusion annealing treatment ranges from 350 DEG C to 480 DEG C, and the time ranges from 2 min to 10 min; and finally carrying out cold rolling treatment to obtain the composite material with the target thickness. An interlayer surface oxidation film of the two metals is extruded and broken through 50%-70% of pressing deformation; an intermetallic compound layer is formed at the joint of two layers of metal through control of a diffusion annealing process, so that the bonding strength between the metal layers is improved. The composite material is high in interlayer bonding strength, and compared with brass, the heat-conducting property is improved, the density is lower, and the electrical conductivity is good.

The invention discloses a high-strength steel hot rolling leveling process, which relates to the technical field of metal rolling and comprises the steps of tapping temperature control, hot coil box relaxation, finish rolling temperature control and segmented cooling relaxation. By controlling the tapping temperature, the residence time of an intermediate billet, the finish rolling temperature and rapid cooling, temperature returning and relaxation in the segmented cooling process and combining specific chemical component design, the crack problem caused by the internal and external temperature difference in the rolling process is effectively avoided, and formation of a brittle phase and a soft phase is restrained. The obtained high-strength steel mainly comprises fine lath bainite, has the comprehensive performance of high strength, high toughness and high ductility, and is suitable for the field of high-end structural materials.

According to the method for improving the surface energy of the high-chromium ferritic stainless steel, the surface energy of the high-chromium ferritic stainless steel is remarkably improved through combined control over the procedures of hot-rolled coiled plate pickling annealing, cold-rolled rolling, cold-line pickling annealing, leveling and the like, the surface energy can reach 44 N / m or above, and the purpose of improving the wettability of the surface of the stainless steel is achieved; and the stainless steel surface easy to coat is obtained.

The application discloses a preparation method of a large-diameter seamless gas cylinder pipe and relates to the field of seamless steel pipe manufacturing. The preparation method of the large-diameter seamless gas cylinder pipe comprises the following steps: continuous casting blank heating, plug-type piercing, precision rolling, sizing, straightening, primary cold drawing, grinding, primary flaw detection and thickness measurement, secondary cold drawing, and secondary flaw detection and thickness measurement. Through a double treatment mode of hot rolling and cold drawing, the deformation amount in the hot rolling and cold drawing steps of the gas cylinder pipe is reasonably distributed, the wall thickness precision of the large-diameter gas cylinder pipe and the quality of the inner and outer surfaces of the gas cylinder pipe are improved, and the yield of the seamless gas cylinder pipe reaches more than 85%.

A metal-strip warped-shape control method for controlling an exit-side warped shape, which is a warped shape of a metal strip downstream of a temper rolling mill in a metal-strip manufacturing facility, the metal-strip manufacturing facility including the temper rolling mill that corrects a shape of the metal strip continuously conveyed, and a warped-shape measurement device that measures a warped shape of the metal strip, the metal-strip warped-shape control method including: calculating an approximation curve for the warped shape of the metal strip using an approximation method selected from parabolic approximation, circular arc approximation, and envelope approximation; and setting operating parameters of the temper rolling mill that can reduce a warp height of the exit-side warped shape based on the approximation curve that is calculated.

The invention discloses an ultrathin lithium metal / alloy negative electrode and a preparation method and application thereof in a solid-state battery, and belongs to the technical field of lithium ion batteries. The ultrathin lithium metal / alloy negative electrode is prepared through a deep cooling rolling process combining deep cooling pretreatment with circulating rolling, the grain size of the negative electrode material can be refined to the micron order or even the submicron order through the process, the grain boundary serves as a physical barrier to hinder dislocation movement, the strain rate of the material under high stress is remarkably increased, and the service life of the material is prolonged. Therefore, the plastic deformation resistance of the material is improved, and the requirement of the solid-state battery on the stacking pressure is effectively reduced. Meanwhile, the prepared lithium metal solid-state battery has the advantage of high energy density, and the cycle life of the battery is prolonged to the maximum extent by inhibiting pore accumulation in the electrode-electrolyte cycle process. The invention provides an effective solution for the technical development of the lithium metal solid-state battery with low cost, high energy density, high safety and long cycle performance.

A 780 MPa-class, high-surface, high-performance, stable, ultra-high hole-expanding steel and a method for producing the same, comprising a composition by weight percentage of 0.03-0.08% C, ≦0.2% Si, 0.5-2.0% Mn, ≦0.02% P, ≦0.003% S, 0.01-0.08% Al, ≦0.004% N, 0.05-0.20% Ti, 0.1-0.5% Mo, ≦0.005% Mg, ≦0.0030% O, with the balance being Fe and other unavoidable impurities. The ultra-high hole-expanding steel of the present invention has good microstructural uniformity, performance uniformity, and excellent matching of strength, plasticity, and ultra-high hole-expanding ratio, and has a yield strength of 750 MPa or more, a tensile strength of 780 MPa or more, and an elongation A 50 The hole expansion ratio is 15% or more and the hole expansion ratio is 70% or more; it also prevents the appearance of red iron scale on the steel plate surface and improves the surface quality of pickled high-strength steel; it fully meets user needs and can be used in passenger car chassis parts that require high strength and thin wall thickness, such as control arms and subframes.