15 results about "Reduction ratio" patented technology

The invention belongs to the technical field of steel and iron material processing and preparation, and discloses a low-temperature toughness optimization method for short-process multi-stage phase change control of a medium-thickness plate. Through the synergistic effect of two times of heating, two times of ultrafast cooling, one-stage rolling and cooling after rolling, the problem of refining the core structure of the medium-thickness plate under the low compression ratio is solved. After primary heating and heat preservation, ultrafast cooling is conducted to the surface room temperature, and secondary cooling is conducted after re-reddening; carrying out secondary heating and heat preservation to regulate and control the grain size of the original austenite, and carrying out multi-pass uniform rolling; and after rolling, laminar cooling is performed to reach the self-tempering temperature of 310-330 DEG C, and a polygonal ferrite and granular bainite double-phase structure is obtained after air cooling. The core impact energy of the steel plate produced through the method is not smaller than 200 J and not smaller than 100 J at the temperature of-80 DEG C and-120 DEG C respectively, the yield strength is larger than or equal to 540 MPa, and the steel plate has high strength and good low-temperature toughness, is suitable for the field of ocean engineering and has good industrial application value.

A method for obtaining the reduction ratio of a continuous rolling mill unit that can reduce roll wear, including: inputting process parameters and continuous rolling mill equipment parameters; establishing an optimization objective and constraint conditions for the minimum roll gap friction work; initially setting the reduction ratio of each stand using an optimization algorithm; calculating the entrance thickness and exit thickness of the rolled piece for each stand; calculating the rolling force and energy parameters of each stand, where the rolling force and energy parameters of each stand include the rolling pressure, transmission torque, forward slip value, roll speed, and main motor power of each stand; determining whether the optimization objective and constraint conditions for the minimum roll gap friction work are simultaneously satisfied. The present invention can be used for online preset calculation of the reduction ratio distribution of a continuous rolling mill unit. The calculated reduction ratio distribution can minimize the roll gap friction work of the continuous rolling mill unit, thereby minimizing the total roll wear of each stand, reducing roll consumption during the rolling production process, lowering the roll change frequency, and increasing the rolling production volume during a single roll period.

The invention relates to carburizing steel and a production method of carburizing steel parts. The carburizing steel comprises the following chemical components in percentage by mass: 0.15%-0.25% of C, 0.30%-0.80% of Mn, less than or equal to 0.035% of P, 0.020%-0.040% of S, 0.90%-1.40% of Cr, 0.20%-0.40% of Mo, 0.020%-0.050% of Al, 0.001%-0.003% of B, 0.10%-0.20% of Cu, less than or equal to 0.04% of V and the balance of Fe and inevitable impurities. Wherein O is smaller than or equal to 12 ppm, and N is 150-200 ppm. In the carburizing steel pretreatment step of the production method of the carburizing steel part, at least two tensile samples are taken from round steel; the carburizing steel is adopted as the round steel; carrying out phosphating treatment on the tensile sample; the tensile samples are divided into two groups for tensile testing, and after the section reduction ratio Z1 / Z2 of the two groups of tensile samples is calculated, the remaining part of the round steel is subjected to staged treatment. The tensile test method does not need complex equipment and is simple to operate.

A method for obtaining the reduction ratio of a continuous rolling mill unit that can coordinate the rolling pressure of each stand, including: inputting process parameters and continuous rolling mill equipment parameters; setting the rolling pressure ratio φ of each stand to the first stand k , and establishing the rolling pressure coordination optimization objectives and constraints for each stand; initially setting the reduction ratio of each stand using an optimization algorithm; calculating the entrance thickness and exit thickness of the rolled piece for each stand; calculating the rolling force and energy parameters of each stand, where the rolling force and energy parameters of each stand include the rolling pressure, transmission torque, forward slip value, roll speed, and main motor power of each stand; determining whether the rolling pressure coordination optimization objectives and constraints for each stand are simultaneously satisfied. The present invention can be used for online preset calculation of the reduction ratio distribution of a continuous rolling mill unit, and the calculated reduction ratio distribution can achieve the distribution of the rolling pressure of each stand according to the set ratio, which is used to effectively adjust the plate crown and achieve the purpose of precisely controlling the strip shape.

A method for obtaining the reduction ratio of a continuous rolling mill unit that can improve the hourly output, comprising: inputting process parameters and continuous rolling mill equipment parameters; establishing an optimization target and constraint conditions for the maximum hourly output; preliminarily setting the reduction ratio of each stand using an optimization algorithm; calculating the inlet thickness and outlet thickness of the rolled piece for each stand; calculating the rolling force and energy parameters of each stand, wherein the rolling force and energy parameters of each stand include the rolling pressure, transmission torque, forward slip value, roll speed, and main motor power of each stand; and determining whether the optimization target and constraint conditions for the maximum hourly output are simultaneously satisfied. The present invention can be used for online preset calculation of the reduction ratio distribution of a continuous rolling mill unit, avoiding the errors caused by the traditional method of setting using a manual experience table, and the calculated reduction ratio distribution can make the hourly output of the continuous rolling mill unit reach the highest, thereby improving the production efficiency and production benefits of the unit.

The invention relates to the technical field of metal material processing, in particular to a steel ring forging process which comprises the following steps: S1, heating a steel ingot to an initial forging temperature of 1150-1250 DEG C; s2, a wide flat anvil high-temperature forced pressing method is adopted, the anvil width ratio is 0.6-0.8, and the reduction rate is 20%; s3, a pre-hole with the diameter being 1 / 3-1 / 2 of the diameter of the steel ingot is formed in the center of the forged steel ingot through a punching technology; s4, a ring rolling mill is adopted for chambering, and the ring rolling ratio of a driving roller to a core roller is 2.5-3.0; s5, through a multi-pass rolling process, the outer diameter of the steel ring reaches the designed size; s6, an air cooling or fog cooling mode is adopted, and the cooling rate is controlled to be 50-80 DEG C / h; and S7, deburring, surface polishing and dimensional precision inspection are included. The technical problems that in the forging and pressing process of an existing steel ring, internal cracks and residual stress are likely to be generated in a steel ingot, and the size precision of the steel ring is likely to be low in the rolling broaching and forming process are solved.

A method for obtaining the reduction ratio of a continuous rolling mill unit that can reduce rolling energy consumption includes: inputting process parameters and continuous rolling mill equipment parameters; establishing an optimization objective and constraints for minimum rolling energy consumption; preliminarily setting the reduction ratio of each stand using an optimization algorithm; calculating the entrance thickness and exit thickness of the rolled piece for each stand; calculating the rolling force and energy parameters of each stand, where the rolling force and energy parameters of each stand include the rolling pressure, transmission torque, forward slip value, roll speed, and main motor power of each stand; and determining whether the optimization objective and constraints for minimum rolling energy consumption are simultaneously satisfied. The present invention can be used for online preset calculation of the reduction ratio distribution of a continuous rolling mill unit, avoiding errors caused by the traditional manual experience table setting method, and the calculated reduction ratio distribution can minimize the rolling energy consumption of the continuous rolling mill unit, thereby reducing the total energy consumption of the unit and the production cost.

The present invention discloses a production method of steel plates for improving performance uniformity and flatness. The production method includes a heating process: the holding time ≥ h × 1 min / mm, where h is the thickness of the continuous casting billet; a controlled rolling process: first rough rolling is carried out in the recrystallization zone to obtain an intermediate billet with a thickness ≥ 60 mm; waiting for temperature, the intermediate billet reciprocates on the roller table at a speed of 0.8 - 1.6 m / s, and the continuous contact time of a single point of the intermediate billet with the roller table ≤ 2 s; finish rolling is carried out in the non-recrystallization zone, the finishing temperature ≥ Ar3 + 40 °C, the reduction ratio of each pass gradually decreases, and the reduction ratios of the last three passes are 18 - 22%, 15 - 18%, and 12% - 14% in sequence; a controlled cooling process: the steel plate obtained by finish rolling is cooled in a water cooling system, the starting cooling temperature > Ar3, and the final cooling temperature < Ar1; when passing through the water cooling system, the forward acceleration of the steel plate is 0.003 - 0.006 m / s2.

The present application relates to a kind of micro-tension load distribution methods for continuous rolling mill group, the continuous rolling mill group includes several racks, including the following steps: the moment of force of the each rack is obtained, reduction ratio and roll diameter;According to the free load torque of the first end rack, the moment of force of the each rack, the reduction ratio of the each rack and the roll diameter of the each rack, the free load torque of the each rack except the first end rack is calculated;According to the free load torque of the each rack and the torque arm length of the each rack, the rolling load of the each rack is calculated;Based on free rolling torque, accurate and reasonable rolling load distribution is carried out, which ensures the stable tension rolling between the racks of continuous rolling mill group, effectively avoids the phenomenon of material stack pulling between the racks, thereby effectively improves the quality of product, and reduces the dependence on operator's technology.

The utility model relates to the technical field of mechanical precision machining, in particular to a speed reducer and a vertical mill. The speed reduction device comprises a driving motor, a first-stage speed reduction assembly and a second-stage speed reduction assembly, the first-stage speed reduction assembly comprises a cylindrical gear and a face gear which are perpendicular in the axial direction, the face gear comprises a gear body and a plurality of gear teeth which are annularly arranged on the end face of the gear body, and the cylindrical gear and the face gear are connected in a meshed mode; the driving motor is connected with the cylindrical gear, and the secondary speed reduction assembly is in transmission connection with the face gear. The speed reduction ratio larger than that of single-stage speed reduction can be achieved through two-stage speed reduction. Meanwhile, the cylindrical gear and the face gear which are perpendicular in the axial direction are meshed to form the first-stage speed reduction assembly, the face gear has a larger transmission ratio, the larger speed ratio of the whole machine can be achieved, the power density is improved, and the cylindrical gear is convenient to replace and maintain.

The invention discloses a controlled rolling and controlled cooling process for a low-compression-ratio large-thickness 355MPa-grade steel plate. The controlled rolling and controlled cooling process comprises the steps of heating, rolling and cooling. The rolling comprises rough rolling and recrystallization zone rolling, intermediate billet cooling and non-recrystallization zone finish rolling; in the rough rolling and recrystallization zone rolling, the initial rolling temperature is larger than or equal to 1180 DEG C, the pass reduction rate is 20%-25%, the final rolling temperature is larger than or equal to 980 DEG C, and the rolling speed is 15-20 r / min; the intermediate billet is cooled by feeding water after rolling, so that the temperature of the intermediate billet is reduced to 820-850 DEG C at the cooling rate of 0.5-1 DEG C / s; according to finish rolling in the non-recrystallization area, the initial rolling temperature ranges from 800 DEG C to 840 DEG C, the final rolling temperature ranges from 780 DEG C to 800 DEG C, the single-pass reduction rate ranges from 10% to 15%, and the rolling speed ranges from 25 r / min to 45 r / min. The 355MPa-grade steel plate with the thickness of 80mm-100mm, which is produced by adopting the controlled rolling and controlled cooling process disclosed by the invention, has good obdurability matching.

Provided are: a hot-rolled steel sheet having a yield strength (YS) of 680 MPa or more and having excellent bending workability and toughness; and a method for producing the hot-rolled steel sheet. The hot-rolled steel sheet has a component composition comprising C, Si, Mn, P, S, Al, N, Ti, and optional components, and has, in terms of the area ratio of the metallographic structure, 0-85% of ferrite, 3% or less in total of retained austenite, 5% or less of the area ratio of a structure having a lath form, 15% or more of the area ratio of a structure having a KAM value of 1.0 or more, and a Ti-containing carbide having an average particle diameter of 8 nm or less. And the yield strength is 680 MPa or more. The manufacturing method of the hot-rolled steel sheet comprises a rough rolling step, a finish rolling step, a cooling step and a coiling step, and is characterized in that in the rough rolling step, a steel billet with the above-mentioned component composition is heated or not heated; in the finish rolling step, the start temperature is 950 DEG C or higher, the total reduction from the first pass to the fifth pass is 75% or higher, and the end temperature is 860-910 DEG C.

The present invention relates to the technical field of steel rolling, and particularly to a rolling method for large-section grinding ball steel billets, which includes the processes of billet heating, blooming rolling and continuous rolling; the blooming rolling adopts 11 passes or 13 passes of rolling. After the first pass of rolling, the steel is not turned over, and the second pass of rolling is carried out along the rolling direction of the first pass; after the second pass of rolling, the steel is turned over by 90°, and then the third pass and the fourth pass of rolling in the same direction are carried out. After the fourth pass of rolling, the steel is turned over by 90° again; and so on, the steel is turned over by 90° after every two passes of rolling in the same direction; the reduction ratio per pass of rolling is 10% - 30%, and the maximum reduction ratio of the billet in a single direction is 40% - 45%. By adopting the blooming rolling method of the present invention, the coarse grains inside the billet can be effectively broken, playing the role of grain refinement; the rolling deformation penetrates into the core of the billet, reducing the influence of the central porosity of the billet on the structure and properties of the finished steel.

The invention discloses a high-magnetic-induction oriented silicon steel cold rolling method, which belongs to the field of oriented silicon steel processing, and comprises the following steps of: feeding a hot-rolled coil into a rolling mill for cold rolling after normalizing, pickling and discharging, and burning two edges of strip steel with gas flame before rolling; the coiling temperature is 50-70 DEG C; a reversible rolling mill is adopted for rolling, the reduction rate of the first three passes of cold rolling is 75-78%, and the rolling speed of the first three passes of cold rolling is 170-370 m / min. According to the method, light heating is achieved only by burning the edges of the two sides of the strip steel through fuel gas flames, normal rolling can be achieved during cold rolling of the high-magnetic-induction oriented silicon steel in cooperation with specific rolling requirements, an independent preheating working section is omitted, production energy consumption can be reduced, the production cost can be reduced, and the production efficiency is improved. And the temperature of the strip steel is increased to an aging interval through deformation heat under the cooperation of the high reduction rate of the first three passes and the high rolling speed, and the magnetic performance of products is improved.

The invention relates to a structure control method for a spring steel hot-rolled wire rod, which belongs to the technical field of hot-rolled wire rod production and comprises the steps of blank finishing, heating, controlled rolling and controlled cooling. Wherein the controlled rolling comprises rough rolling, intermediate rolling, pre-finish rolling, finish rolling and reducing and sizing, the rough rolling, the intermediate rolling and the pre-finish rolling adopt high-temperature large-deformation rolling, the finish rolling temperature, the reducing and sizing temperature and the deformation are controlled, and the spinning temperature is controlled; and cooling the wire rod to 500 DEG C by adopting a slow cooling process, taking out of a cover, and performing air cooling. Compared with the structure control thought that the inside and the outside of the wire rod are uniform and uniform in a conventional production process, the novel method for controlling the structure of the wire rod is provided, the surface structure is in a pre-spheroidizing state, the hardness and the hardening coefficient are low, the method is more suitable for drawing production of large-area-reduction-rate or special-shaped steel wires, the area reduction rate of single-pass drawing can be increased, and therefore the drawing pass is reduced, and the production cost is reduced. Or at least one normalizing heat treatment is reduced.