31results about How to "Guaranteed rolling stability" patented technology

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 method for producing large-specification circular blanks in a rolling mode instead of a forging mode. The method mainly comprises the following steps that 1, rough rolling pass designing is conducted, specifically, rough-rolled holes are a combination of flat holes, box-type holes and intermediate billet finished holes; 2, firstly, the heating time before rough rolling is prolonged, secondly, the pass reduction of the front passes is made to be small while the pass reduction is increased in later passes in order to ensure rolling stability, and thirdly, the tapping temperature is improved, the number of rolling passes is reduced by adjusting the pass reduction; 3, firstly, two-radius oval holes with small long axes and short axes are adopted as finishing pass before finished products are formed, and secondly, circular holes are adopted as last pass for rolling; and 4, firstly, the position of the blanks in a furnace is adjusted, and it is ensured that the temperature difference of surfaces of the blanks is within 30 DEG C, secondly, the control mode of cooling water of a roller is adjusted, and thirdly, the assembly quality requirement is determined, quantitative management is conducted, and the assembly quality of a tool is ensured. The forging mode is replaced with the rolling mode through improvement of the rolling process and selection and designof the rolling mill passes, and the product competitiveness is improved.

The invention discloses a plate shape control method of high-strength steel for a longitudinal beam of a commercial vehicle. The plate shape control method comprises the following steps that: 1) a hotblank is charged into a furnace; 2) the plate blank is heated; (3) rough rolling is conducted, specifically, a 1+5 rolling mode is adopted, bending amount of a C-shaped bend or an S-shaped bend in the last pass is controlled within +/-10mm, wedge shape control range is controlled within +/-20[mu]m, and rough rolling finishing temperature is controlled within 1040-1080 DEG C; (4) finish rolling isconducted, specifically, outlets of F1-F4 racks adopt large convexity value control, F5-F7 racks adopt an equal-proportion convexity control mode, and convexity control range of a finished product is0-20[mu]m; 5) layer cooling is conducted, specifically, a front-section ultrafast cooling and rear-section air cooling mode is adopted; 6) slow cooling is conducted, specifically, preheating is conducted in advance in a heat preservation wall, and a steel coil is hoisted into the heat preservation wall for slow cooling; and 7) straightening and flattening are conducted. According to the plate shape control method of the high-strength steel for the longitudinal beam of the commercial vehicle, the high-strength steel for the longitudinal beam of the commercial vehicle prepared is good in apparent plate shape, has no potential plate shape risk, and completely meets the high-standard requirement of a rolling forming process of the high-strength steel for the longitudinal beam of the commercial vehicle on the plate shape.

The invention discloses a production method controlling warping of strip steel on a finishing mill. The production method comprises the steps that for a lower guide plate at outlets of an F5 rack andan F6 rack of a finishing mill set, a transition plate and a movable overskirt plate, the height difference between the lower guide plate and the transition plate is controlled to be between 5 mm-15 mm, the height difference between the transition plate and the movable overskirt plate is controlled to be between 5 mm-15 mm, the lower guide plate is higher than the transition plate, and the transition plate is higher than the movable overskirt plate; and for the lower guide plate at the outlets of the F5 rack and the F6 rack, the height of the gnawing marks or steps of the lower guide plate iscontrolled to be lower than 5 mm, and the gnawing marks or the steps are polished. Through the production method, stable and smooth operation of thin-gauge strip steel in the finish rolling strip penetrating process can be ensured, the problem of warping of the head of the strip steel between the finish rolling racks and at the finish rolling outlet is avoided completely, meanwhile rolling stability of the strip steel is ensured, and the risk of steel piling accidents is reduced.

The invention relates to an anti-rolling-fracture roll of a hot rolling temper mill. The anti-rolling-fracture roll comprises at least two supporting rolls and work rolls. The at least two supporting rolls are arranged in two rows side by side and rotationally arranged on a movable base through a first bearing assembly. The work rolls are closely attached to the lower portions of the two rows of supporting rolls and rotationally arranged on the movable base through a second bearing assembly. A bearing block of the second bearing assembly is an elastic bearing block. The invention further relates to an application method of the anti-rolling-fracture roll of the hot rolling temper mill. The method comprises the following steps that a steel roll is coiled on a coiling block of an uncoiling machine, the steel roll is opened, and strip steel forwards penetrates a pinch roll; when the strip steel is pressed by the pinch roll, a drive device downwards presses the work rolls to the part, between the uncoiling machine and the pinch roll, of the strip steel; and when the tail of the innermost ring of the steel roll leaves the coiling block of the uncoiling machine, the drive device elevates the work rolls. The anti-rolling-fracture roll is reliable in structure and capable of absorbing vibration and impacts brought by wave shapes of fed materials, the rolling stability is guaranteed, and the surface quality and performance of the strip steel are improved.

The invention discloses a plate shape control method for steel for a hot-rolled high-strength stirring tank body. The plate shape control method comprises the following steps that (1) hot blanks are charged; (2) plate blanks are heated; (3) rough rolling is conducted, specifically, a 1+5 rolling mode is adopted, the bending amount of C-shaped bending or S-shaped bending of the last pass is controlled within +/-10mm, the wedge-shaped control range is within +/-20[mu]m, and the rough rolling ending temperature is controlled to be 1040-1080 DEG C; (4) finish rolling is conducted, specifically, large convexity value control is adopted for outlets of F1-F4 racks, an equal proportion convexity control mode is adopted for F5-F7 racks, and the finished product convexity control range is 0-30[mu]m;(5) layer cooling is conducted, specifically, a front-section ultra-fast cooling and rear-section air cooling mode is adopted; (6) slow cooling is conducted, specifically, preheating is conducted ina heat preservation wall in advance, and steel coils are discharged from a production line and hoisted into the heat preservation wall for slow cooling; and (7) straightening and flattening are conducted. The steel for the hot-rolled stirring tank body is prepared according to the plate shape control method, the apparent plate shape of a material is good, the warping amount during discharging cutting is less than or equal to 5mm, and the requirements of the welding process of an automobile concrete stirring tank body for the plate shape are completely met.

The invention discloses a comprehensive optimization setting method for a rolling schedule of ultrahigh-strength steel of a six-rack cold continuous rolling unit, and the method comprises the following steps: firstly, collecting basic equipment parameters of the six-rack cold continuous rolling unit and related parameters of ultrahigh-strength steel to be rolled; then calculating a reduction distribution result X gamma, a reduction distribution fine adjustment result XZ, a reduction distribution optimal solution Xy and a tension system optimal solution XT based on capability input ratio homogenization of each rack device; and finally, completing the comprehensive setting of the rolling schedule according to the obtained optimal data. When the method disclosed by the invention is applied, the capability of rolling mill equipment of each rack is ensured to be in a relatively uniform state, and the respective advantages and characteristics of a small-roller-diameter rolling mill and a conventional rolling mill are fully exerted, so that the pressing distribution and tension system stable complementary type rolling schedule comprehensive optimization setting method in the ultra-high-strength steel cold continuous rolling process is formed, the utilization optimization of the comprehensive rolling capacity of the unit is realized, and the rolling stability and the finished product quality in the cold continuous rolling process of the ultrahigh-strength steel are guaranteed.

The invention discloses a method for positioning for plate blank distribution according to the steel type and the finished product specification. The method is characterized in that plate blanks reaching a feeding checking roller way are subjected to secondary position positioning based on three indexes of thickness, hardness and steel type of the plate blank before entering corresponding rollingpositions according to a distribution graph meeting process requirements. According to the method, the secondary position positioning mode is adopted for three situations correspondingly, the positions of the plate blanks are further refined on the basis of previously following the distribution graph meeting the process requirements so that the parameters such as the different steel types and thefinished product specifications can be flexibly adapted to the plate blank distribution of a plate blank furnace of a heating furnace.

The invention provides a high-efficiency descaling method for an iron oxide scale generated by a hot-rolled short-process production line heating furnace, the method is used for realizing the completeremoval of the iron oxide scale in the heating furnace in the short-process production process through aerosol spraying and high-pressure water descaling. The method is based on the components of thehot-rolled steel plate, the heating system, the thickness of the furnace-generated iron oxide scale and the temperature range to adjust the gas-water ratio of a gas-mist spraying device, the height between the device and the steel plate and the distance between the device and the high-pressure descaling device, on the basis of the high-temperature plastic change interval of the iron oxide scale,huge heat stress is generated in the iron oxide scale in the rapid temperature change process is utilized, the integrity of the iron oxide scale can be rapidly dissociated in the non-plastic area of the iron oxide scale, the descaling efficiency of the iron scale of the short-process tunnel type heating furnace is improved by matching with the subsequent high-pressure water descaling, so that thepressing-in defects of the iron oxide skin are reduced, and the surface quality of the rolled steel produced by the hot-rolling short process is improved.

The invention discloses a reduction schedule optimization method for rolling steel in a five-pass mode in six-rack cold continuous rolling. The reduction schedule optimization method comprises the steps that S1, basic equipment parameters of a six-rack cold continuous rolling unit and related parameters of high-strength steel to be rolled are collected; s2, rolling schedule optimization process parameters are defined according to basic equipment parameters of the six-rack cold continuous rolling unit and related parameters of high-strength steel to be rolled; s3, defining an outlet plate shape of high-strength steel rolled in a five-pass mode based on the six-rack cold continuous rolling unit and a reduction distribution optimization objective function of stable rolling, and then calculating the optimization objective function; and S4, outputting the outlet plate shape of the high-strength steel rolled by adopting the five-pass mode based on the six-rack cold continuous rolling unit and the rolling stability reduction distribution result corresponding to the minimum value of the optimization objective function. According to the method, under the condition that one-pass rolling mode is reduced, the advantages of a small-roller-diameter rolling mill are fully played, and the purposes of reducing energy consumption and improving production efficiency are achieved on the premise that the rolling stability and the quality of finished products are guaranteed.

The invention relates to the technical field of hot-rolled strip steel production control, in particular to a setting method for descaling of a finish rolling inlet of a hot-rolled strip steel production line. Comprising the following steps of 1, performing result set exhaustion analysis on original control logic, and summarizing all conditions causing an abnormal set value; 2, induction is carried out on abnormal set value occurrence conditions, and an abnormal condition capture formula is fitted; 3, the set value of the water spraying collecting pipe of the finish rolling inlet descaling equipment is corrected to be consistent with the corresponding available state: FSB1SET = FSB1USE; and FSB2SET is equal to FSB2USE. And the abnormal conditions that at least one group of FSBs is in an available state, at least one group of FSBs needs to be started according to a model calculation result, and the set values FSBs are in an all-closed state are avoided.

The invention discloses a Waspaloy alloy large casing forge piece precision rolling forming method which is characterized in that the scheme of special-shaped pre-rolling, special-shaped finish rolling and special-shaped bulging is adopted, and the rolling deformation amount is guaranteed through the design of a pre-rolling core roller with the small size; the rolling stability of the blank in the finish rolling process is guaranteed through the finish rolling core roller with the large size; and meanwhile, the special-shaped bulging process is combined, the precision of the forged piece is improved, the material utilization rate is increased, and the manufactured Waspaloy alloy large casing forged piece meets the design requirement. The rolling forming method is mainly used for rolling forming of the large Waspaloy alloy casing forgings.