159results about How to "Stable rolling process" patented technology

The invention provides ultra-high strength steel with yield strength level of 1100MPa-1200MPa and a production method of the steel. The chemical constituents (weight percentage) include: 0.15-0.18% of C, 0.20-0.25% of Si, 0.85-1.25% of Mn, 0.20-0.60% of Cr; and 0.45-0.65% of Mo, 0.035-0.060% of V, 0.015-0.020% of Nb, 0-0. 55% of Ni, 0-0.035% of Cu, 0.01-0.06% of Al, no more than 0.015% of P, no more than 0.01% of S, no more than 0.008% of N, the balance of Fe and unavoidable impurities. The production method includes: smelting and casting into casting blank; and heating the casting blank to 1150-1250 DEG C, wherein the final rolling temperature is 860-920 DEG C, the coiling temperature is 650-750 DEG C, the quenching heating temperature is 880-930 DEG C, the thermal insulation time is 20-90min, the tempering heating temperature is 100-450 DEG C, the thermal insulation time is over 90min. Slow cooling or air cooling is conducted to room temperature. For the steel plate produced with the constituents and the technology, the yield strength is 1150-1230MPa, the tensile strength is 1250-1340MPa, the elongation is 11-13.5%, and the impact power value at minus 40 DEG C is 21-34J.

The invention provides a comprehensive setting method for tension and rolling pressure in a VC (Variable Crown) roll temper mill wet leveling process and belongs to the field of controlling. The comprehensive setting method comprises the following steps: related parameters are set by a temper mill control computer; related data or operational plans are acquired by the control computer through an input device or a superior computer; all operational parameters of the temper mill are controlled according to a pre-setting control mode, a method or setting parameters; all original values and optimizing step lengths are set according to equipment, technologies and quality parameters; under the premise of making ' taking rolling stability as optimized objective function and the finished product shapes, mechanical properties and surface roughness are qualified' as a constraint condition, three parts of metal model parameters such as rolling pressure, forwards and backwards tension and the like are taken as a whole to be set harmoniously; the rolling force and the forwards and backwards tension are set optimally; under the premise of guaranteeing product mechanical properties, the product mechanical properties, comprehensive control capability of the shapes and surface quality are improved, the production efficiency is guaranteed and the product quality is improved simultaneously.

The continuously casting and head-less rolling process for moderately thick plate includes the following steps: continuously casting plate blank, depressing liquid core, high temperature rolling, end cutting with flying shear, steam water cooling, finish rolling, sectional shearing, laminated cooling, cold bed or ground winding, finishing and warehousing. The present invention has raised metal yield, lowered fuel and power consumption, low end cutting rate, less rolling gates, and high output and finished product rate.

The invention relates to a composite roll forming process of a thick-wall deep-groove ring member. The process is characterized by comprising the following steps of: (1) blank design of the ring member: based on the principle of constant volume, determining the size of ring member blank according to the size of the ring member and the rolling ratio; (2) groove design: designing the sizes of the working surfaces of a main roller and a core roller according to the rolling deformation conditions of the ring member and the equipment structural requirements; and determining the size and position of the working surface of an auxiliary roller according to the sizes of the ring member blank, ring member and the main roller; (3) design of forming parameters: successively designing the rotation speed of the main roller as well as the feed speed and rolling time of the main roller according to the rolling deformation conditions of the ring member and the size of the main roller; and (4) roll forming. Through the invention, reasonable design of the composite roll forming process of the thick-wall deep-groove ring member can be realized, normal stable roll forming of the thick-wall deep-groovering member is guaranteed, the rejection rate and defective rate of the rolling are reduced, and the energy-saving material-saving high-quality and efficient roll forming of the mechanical parts suchas duplicate gears, bilateral flanges, bilateral supporting wheel bodies, high-pressure ball valves and the like is realized.

The invention discloses a method for producing ultra-thin hot rolling strip steel with variable/constant specification by adopting a semi-endless technology; qualified molten steel after refining is sent to a first continuous caster and a second continuous caster to be cast into a flat blank; the semi-endless flat blank cast by the first continuous caster enters a first roller-hearth type soaking furnace for being heated at the temperature of 1050-1150 DEG C, which is sent to a high pressure water descaler at a rolling mill area for the removal of iron scale on the surface of the flat blank and is rolled into the ultra-thin hot rolling strip steel with the thickness being 0.8-1.8mm and the width being 1229-1265mm by F1-F7 rolling mills of a fine continuous rolling mill group; the hot rolling strip steel within the final rolling temperature rang of 860 DEG C to 880 DEG C enters a laminar flow cooler for cooling and is quickly cut by a high-speed flying shear according to the weight of each steel coil; the cut strip steel is alternately coiled by a first coiling machine or a second coiling machine into a finished coil with three or four variable/constant specifications. The ultra-thin hot rolling strip steel produced by the method can expand the products of the strip steel, stabilize rolling condition, lower abrasion of rollers, reduce the times of band penetration and whipping, decrease the loss of waste head and crop end of the products and enhance the yield of the products and productivity.

The invention discloses a two-roller reversible mill roller device and technology using continuous casting round billets for carrying out rolling production. Four types of hole patterns including a transition hole pattern, a supporting hole pattern, a before-finished-product hole pattern and a finished product hole pattern are designed on a pair of rollers. The rolling technology comprises the steps of using the transition hole pattern (1) for rolling the continuous casting round billets, and turning over steel after rolling is accomplished, wherein the rolling reduction ranges from 40 mm to 90 mm per pass; using the supporting hole pattern for continuously rolling the drum-shaped rolled pieces obtained in the previous step to obtain rectangular or square rolled pieces which have regular shapes, and turning over the steel after rolling is accomplished, wherein the rolling reduction ranges from 40 mm 90 mm per pass; using the before-finished-product hole pattern (3) for rolling the rolled pieces to obtain rectangular or oval rolled pieces with reserved rolling reduction and reserved broadening quantity, and turning over the steel billets after rolling is accomplished, wherein the rolling reduction ranges from 20 mm to 90 mm per pass; using the finished product hole pattern for rolling one pass to obtain rolled pieces which are high in dimensional accuracy and product quality, wherein the rolling reduction of square or rectangular steel finished products ranges from 40 mm to 60 mm per pass, and the nominal rolling reduction of round steel ranges from 10 mm to 40 mm per pass.

The invention discloses a high-performance tin-phosphor bronze strip and a production method thereof. The high-performance tin-phosphor bronze strip comprises, by weight percent, 9% to 11% of Sn, 0.03% to 0.35% of P, not larger than 0.2% of Zn, not larger than 0.1% of Fe, not larger than 0.2% of Pb and the balance copper. Through the strict control over a casting technology, a rolling technology and an annealing technology of a tin-phosphor bronze alloy, a high-performance tin-phosphor bronze strip alloy product with the tin content ranging from 9% to 11% can be produced, and the application requirement of an IT industry and an electrommunication industry for a high-elasticity, high-strength and high-hardness copper alloy can be met.

The invention relates to a hot-processing production system for a titanium and titanium alloy seamless tube, a seamless tube prepared by using the hot-processing production system and a hot-processing production method for the seamless tube, and belongs to the technical field of titanium and titanium alloy seamless tube production. By improving various units and all kinds of auxiliary equipment, particularly, reselecting materials of parts and heating and rolling working modes thereof, thus the equipment precision is improved and the stability of the system is controlled, and a rolling process is enabled to be more stable, thereby ensuring that the quality and size of the inner and outer surfaces of the seamless tube are stable. On such basis, according to the hot-processing production method, various working procedures are arranged reasonably and efficiently, and a tube blank is coated with a protective layer before heating, so that the problem that the tube blank reacts with oxygen and nitrogen and absorbs hydrogen is well solved, the defect of exceeding standards does not occur in the tube blank and a foundation is laid for subsequent rolling.

The invention relates to the technical field of special-shaped forged piece manufacturing technologies, in particular to a multi-step large-diameter casing ring forged piece and a manufacturing methodthereof. According to the multi-step large-diameter casing ring forged piece and the manufacturing method thereof, the casing ring forged piece is manufactured through processes of discharging, upsetting, punching, mandrel supporter reaming, inclining through breaking-off, forming die blanking, pre-rolling and rolling forming; the size distribution characteristic of a blank in the height direction meets the final forming requirements through upsetting, punching, mandrel supporter reaming, and forming die blanking; the large end of the blank is made to face downwards through a special structure, and rolling of the blank is ensured to be stable by loading from the position above a core roller die; the blank makes tight contact with the die by adjusting the size of the ring billet, and axialmoving of the blank is prevented; grains are refined by using high-temperature large deformation at the earlier stage, and the grains are kept to be unchanged by adopting low-temperature small deformation in the follow-up special-shaped blanking and forming process, so that the grains are fully refined; and finally, according to the manufacturing method of the multi-step large-diameter casing ring forged piece, rolling is stable, and the rolling precision of the forged piece can be well ensured.

The invention provides a first-pass closed roll gap tail-swing rolling method for a reversible cold rolling mill. The method comprises the steps of lowering the speed of a unit to a low speed before the first-pass closed roll gap tail-swing process, and controlling an uncoiling machine compression roll, an uncoiling and pinching roll compression roll, an inlet turning and pinching roll compression roll, an outlet turning and pinching roll compression roll and an outlet coiling machine compression roll to compress strip steel; after an uncoiling machine loses tension, stopping the unit, pressing an inlet pressing plate table down and keeping an outlet coiling machine tensioned for realizing stable rolling in the tail-swing process; in the first-pass closed roll gap tail-swing process, adopting the constant rolling force control mode, thinning strip tails, preventing the thickness fluctuation of the strip tails from influencing the rolling state, setting a working roll and an intermediate roll to receive the roll bending force, preventing the strip steel from being deflected and spraying emulsion on the strip steel; after the first-pass closed roll gap tail-swing process is completed, lowering the rolling force of roll gaps, setting the working roll and the intermediate roll to receive the balance force and guaranteeing the position stability of the strip steel in the second-pass reverse tape threading process.

The invention relates to the field of slab band cold rolling post-treatment, in particular to a method for automatically controlling a plate shape of a continuous annealing leveling mill. A method for automatically controlling a plate shape of a continuous annealing leveling mill based on a stability index is characterized in that the method comprises the following steps of measuring data of an actually measured plate shape with a plate shape measuring roll, obtaining primary and secondary plate shape deviation coefficients alpha 1 and alpha 2; obtaining the basic parameters of a continuous annealing leveling mill through a test; firstly calculating the obtained basic gain coefficient and a stability index, and then calculating the gain coefficient, and finally multiplying the gain coefficient with the plate shape deviation coefficients, obtaining the adjustment quantity of a plate shape executive mechanism of the continuous annealing leveling mill. With the adoption of the method provided by the invention, the gain coefficient is optimized on-line with the change of the plate shape deviation; the stability index is defined in a certain value range, so that the rolling stability of the continuous annealing leveling mill can be ensured and the plate shape quality of the band steel can be improved.

The invention provides a rolling technology method for an ultra-thin ultra-wide steel plate. The rolling technology method for the ultra-thin ultra-wide steel plate comprises the steps that the soaking temperature of a steel pushing type heating furnace is controlled to range from 1200 DEG C to 1250 DEG C, it is guaranteed that time of a soaking zone is longer than or equal to 60 minutes, and the head and tail temperature difference of a billet is smaller than or equal to 30 DEG C; dog bone rolling is adopted in a rough rolling forming stage and the last pass of a broadening stage; supporting rolls are of a flat roll type and has chamfers in the edges, and the lower roll diameter of a working roll is 2 mm to 5 mm larger than the upper roll diameter of the working roll; the deference of the manipulator centering degree is no larger than 10 mm; the rolling pass of a rough mill is controlled according to the eighth pass to the tenth pass, fine rolling is carried out according to the sixth pass to the eighth pass, reduction of the last three passes is gradually decreased, and the reduction rate of the last three passes is controlled to be 10 % to 15%; two eleven-roll straighteners are used for straightening. According to the rolling technology method for the ultra-thin ultra-wide steel plate, a 2800-mm mill can be used for producing the steel plate with the thickness smaller than 10 mm and the width larger than 2600 mm.

The invention discloses a 600MPa-grade thin hot-rolled automobile structural steel produced by a short process. The steel is prepared from the following components in percentage by weight: 0.045 to 0.075 percent of C, not more than 0.20 percent of Si, 1.00 to 1.25 percent of Mn, 0.11 to 0.14 percent of Ti, not more than 0.015 percent of Nb, not more than 0.015 percent of V, 0.015 to 0.050 percentof Als, not more than 0.018 percent of P, not more than 0.005 percent of S, and not more than 0.006 percent of N. A production method comprises: performing continuous casting into a thin slab after conventional smelting; soaking the thin slab; performing scale removal for two times; performing finishing rolling for seven times; performing laminar cooling to a coiling temperature; coiling; leveling. According to the invention, the shortcomings of poor plate shape and roll shape, unstable rolling process and the like in the process of rolling the 600MPa-grade thin hot-rolled automobile structural steel by a short process are solved, the high-stability and large-scale production of the 600MPa-grade thin hot-rolled automobile structural steel produced by the short process is realized, the plate shape and the roll shape are excellent, the rolling process is stable, the finished product rate of an original variety is increased to 93 percent or more, and the purpose of replacing a cold-rolledproduct is achieved.

A method and device for measuring and adjusting the evenness and/or tension of a stainless steel strip (1) during cold rolling in a 4-roll stand (2) provided with at least one control loop (4) comprising several actuators (3), resulting in more precise measurement and adjustment due to the fact that an evenness defect (10) is determined by comparing a tension vector (8) with a predefined reference curve (9), whereupon the characteristic of the evenness defect (10) along the width of the strip is broken down into proportional tension vectors (8) in an analysis building block (11) in a mathematically approximated manner and the evenness defect proportions (C1...Cx) determined by real numerical values are supplied to respectively associated control modules (12a; 12b) for actuation of the respective actuator (3).

The invention discloses a roll-wear mathematical-model optimization method for improving CSP product quality. The method uses two sets of data for the thin-slab continuous casting and rolling flow of the single and the double flow production and for all frame roll-wear mathematical-model parameters in a flatness control system of a plate mill, and is able to automatically distinguish and select according to the single and the double flow production, and then under the single or the double flow production state, the calculated value and the actual value of roll wear are relatively identical, acquiring strips of the improved quality, enhancing production efficiency and rolling yield, and boosting high-proportion thin-gauge hot rolling plate production.

The invention relates to a guide beam device of a bar milling machine, relating to a guide beam device, in particular to the guide beam device of a bar milling machine, aiming to solve the problems of the guide beam device of the existing bar milling machine such as frequent collision of a rolled piece against the guide beam during steel rolling, loosening of each part of the guide beam device and poor stability during rolling. The guide beam device of the bar milling machine comprises an upper crossbeam, a pressing component, two pull bars, two guide brackets, a lower crossbeam, a sliding rail, a clamping plate and a sliding screw component. The two ends of the upper crossbeam are respectively connected with the upper end of one pull bar, the two ends of the lower crossbeam are respectively connected with the lower end of the other pull bar, the guide brackets are respectively sleeved on one pull bar, the pressing component is arranged in the middle of the upper crossbeam, the lower crossbeam is arranged in a groove on the lower surface of the sliding rail, the clamping plate is arranged on the sliding rail, and the sliding screw component is arranged on the lower surface of the lower crossbeam and can drive the sliding rail for linear movement along the upper surface of the lower crossbeam. The guide beam device of the bar milling machine is used for guiding rolled pieces.

An embodiment of the invention provides a high-strength steel rolling method and device. The method comprises the steps of controlling the reduction ratio of a first rack to be 15% to 25%, the rollingforce to be 23929 kn to 26448 kn and the speed to be 79 mpm to 81 mpm; controlling the reduction ratio of a second rack to be 15% to 25%, the rolling force to be 24752 kn to 27356 kn, the speed to be104 mpm to 106 mpm and the forward slip to be -0.955 to 3.045; controlling the reduction ratio of a third rack to be 15% to 25%, the rolling force to be 23465 kn to 25935 kn, the speed to be 154 mpmto 156 mpm and the forward slip to be -0.954 to 3.046; controlling the reduction ratio of a fourth rack to be 12%-20%, the rolling force to be 23144 kn to 25580 kn, the speed to be 199 mpm to 201 mpmand the forward slip to be -0.957 to 3.043; and controlling the reduction ratio of a fifth rack to be 5% to 15%.

The invention relates to a dynamic constant thickness ratio taper control method, wherein the method comprises the following steps: 1) effectiveness judgment of finish rolling outlet band steel taper measured value; obtaining an actual measurement feedback by methods such as filtering, obtaining the needed control deviation W after comparing with a benchmark; 2) calculation of roll gap deviation value on bilateral sides of F1 rolling mill; 3) calculation of roll gap deviation value on bilateral sides of F2 rolling mill; the calculation of F3 rolling mill is in a similar way; adjusting based on the value which is obtained from real-time memorizing and tracking the roll gap actual adjustment on bilateral sides of the F2 rolling mill. The method has the advantages as follows: 1) the method is simple and easy to operate; 2) the method obviously increases the taper control precision since the application of Meishan steel 1780 hot continuous rolling; the comprehensive taper index of plus or minus 20 microns is increased from 50% in the past to the 90% at present; stable application of rolling thin band steel having a thickness of 2.0mm can also be achieved; not only the taper control precision is increased, but also the stability in plate shape and rolling is ensured.

The invention discloses a finish rolling stability control method, and belongs to the technical field of rolling processes. The finish rolling stability control method comprises the following steps: the load distribution of a finish rolling machine is controlled; the tension distribution of the finish rolling machine is controlled; the plate strip convexity ratio is controlled; the control of theplate strip convexity ratio comprises the following steps: a formula of Ci/Hi=Ci+1/Hi=1 is adopted according to a frame plate type straightness control theory, wherein Ci is the outlet convexity of anupstream frame, Hi is the outlet thickness of the upstream frame, and i is the ith frame number; the frame convexity distribution adopts the set convexity 1; and when the frame outlet thickness is larger than 7 mm, a formula of Ci/Hi=(Ci+1/Hi+1)*delta is adopted, wherein delta is the transverse nonuniform extension coefficient. The finish rolling stability control method guarantees the stabilityin the finish rolling process, and solves the vibration problem of the rolling machine, the surface quality problem, the center wire control problem and the plate type problem.

The invention discloses a full-automatic control method for steel sintering temperature of a heating furnace. The parameters of plate blank temperatures are calculated by arranging heating models according to different steel types and specifications. Heating model parameters in a database table are given to the specific plate blanks and sent to a secondary heating model control system through a tracking system, and then the temperature lower limit of the plate blanks entering each section of the heating furnace and the temperature upper limit of the plate blanks discharged from each section of the heating furnace can be adjusted; the temperature set value of each section of a hearth is adjusted through a limiting requirement model; if the plate blanks of different steel types and specifications exist in the heating furnace, the temperature upper limit and the temperature lower limit of each plate blank are worked out, the temperature of the hearth is adjusted according to each plate blank, and the adjustment principle is that on the premise of considering all the plate blanks in each section, the plate blanks discharged out of the furnace are guaranteed preferentially, the temperature of the plate blanks can be automatically controlled when the plate blanks of different steel types and specifications exist in the same furnace, each plate blank can reach the target tapping temperature when arriving at the discharge position, and meanwhile the requirement for the start rolling temperature of rolling of a rolling mill is met.

The invention discloses a method for detecting rolling force of racks of a rolling mill controlled by a computer in hot continuous rolling. The method comprises the following steps: rolling force in an oil pressure manner is obtained; rolling force detected by a pressure measuring head is input; a static deviation in different pressure measuring manners is detected; a dynamic deviation in different measuring manners is detected; a deviation of different kinds of PC angular rolling force is detected; and a deviation of oil pressure rolling force is compensated. Due to the fact that in a finite element model, the method takes site actual production process parameters as input values, the method is close to actual production environment and can really reflect changing situations of deformation resistance in continuous rolling of all the racks. According to the method, a deformation resistance model of a second-level system can be optimized; a corrected deformation resistance value is used for optimizing a rolling force set value; the preset precision of rolling force is improved; stability of the rolling process is ensured; and the product quality is improved. Through dynamic deviation compensation control and dynamic and static deviation comprehensive control, the online rolling force detecting and controlling technology is achieved.

The invention relates to a roller of a three-roller planetary rolling mill. The roller (1) is basically in a conical shape. The invention is characterized in that the roller (1) is divided into five regions from the tail part to the head part, and the five regions are sequentially a material inlet region (S), a deformation region (S1), a process region (S2), a sizing region (S3) and a material outlet region (S4), annular concavo-convex lines (12) are uniformly distributed in the radial direction on the conical surface of the roller (1) in the deformation region (S1) at intervals, and in addition, inclined lines (11) formed by the axial projection of the concavo-convex lines (12) are sinusoidal curves. Compared with the prior art, the invention has the advantages that the smooth feeding and continuous stable and efficient rolling of rolling element blanks can be ensured in the rolling process, in addition, the influence of the rolling element surface quality caused by the severe vibration of the blank deformation can be avoided, the thread pitch of the rolled pipe materials in actual operation is uniform and stable, and the service life of the roller is greatly prolonged.