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CN-121988607-A - System and method for cold continuous rolling of high-grade non-oriented silicon steel

CN121988607ACN 121988607 ACN121988607 ACN 121988607ACN-121988607-A

Abstract

The invention provides a system and a method for cold continuous rolling of high-grade non-oriented silicon steel, the system sequentially comprises an uncoiler, a six-continuous rolling unit, a pickling device, an induction heating device, a coiling machine and a control system along the production flow. The six continuous rolling units adopt the composite configuration of a one-frame eighteen-roller mill and a five-frame six-roller mill, rollers are in a fusiform composite roller shape, convexity of the rollers is set through a rolling force and strip steel width dynamic calculation model, and the method realizes stable and efficient continuous rolling of the high-silicon-content non-oriented silicon steel through sectional rolling reduction distribution, step tension control, dynamic induction heating and targeted plate shape control. The method effectively solves the problems of edge cracking, plate-shaped fluctuation, uneven grain growth and the like in the rolling process, remarkably improves the consistency of the yield and the product performance, and is suitable for continuous production of high-grade non-oriented silicon steel with various thicknesses.

Inventors

  • ZHOU WENBIN
  • ZHU JIQIAO
  • LI JIAO

Assignees

  • 广西宏旺新材料科技有限公司

Dates

Publication Date
20260508
Application Date
20260209

Claims (6)

  1. 1. A system for cold continuous rolling of high-grade non-oriented silicon steel is characterized by sequentially comprising an uncoiler (1), a six continuous rolling unit (2), a pickling device (3), an induction heating device (4), a coiling machine (5) and a control system (L2) along a rolling line, wherein the six continuous rolling unit (2) comprises a first stand (F1), a second stand (F2), a third stand (F3), a fourth stand (F4), a fifth stand (F5) and a sixth stand (F6), the first stand (F1) is a eighty-high rolling mill, the working roll diameter range of the first stand is phi 70 mm-phi 100mm, the working roll diameter range of the second stand (F2) to the sixth stand (F6) is five six rolling mills connected in series, the working roll diameter range of the second stand (F2) to the sixth stand (F6) is phi 400 mm-phi 450mm, the rolls in the six continuous rolling unit (2) are shuttle-shaped structures, the diameters of two ends of each roll extend to the middle gradually increase, and the convexity of each roll passes through a formula A dynamic setting is made, wherein, Is the convexity of the roller of the nth frame, As the base convexity of the convex-shaped lens, For the correction factor of the rolling force, For the actual rolling force of the nth stand, Is the reference rolling force of the nth frame, For the width correction factor(s), Is the actual width of the strip steel, The device is characterized in that the device is used for controlling the width of a silicon steel strip, the pickling device (3) is arranged at the tail end of the six continuous rolling mill unit (2), the induction heating device (4) is arranged at the rear end of the pickling device (3) and used for heating the cleaned silicon steel strip, and the control system (L2) is electrically connected with the induction heating device (4), a transmission system, a hydraulic pressing system, a plate shape control system and a tension detection system of each frame of the six continuous rolling mill unit (2).
  2. 2. The system according to claim 1, characterized in that the working roll diameter of the eighteen-high rolling mill of the first stand (F1) is preferably Φ95mm, and the working roll diameter of the six-high rolling mill of the second to sixth stands (F2) to (F6) is preferably Φ410mm.
  3. 3. The system according to claim 1, characterized in that the induction heating means (4) is an intermediate frequency induction heater, the heating power of which is dynamically regulated by the control system (L2) according to a control model, the target temperature The calculation formula of (2) is as follows: Where T is the target temperature of the induction heating device 4, As a function of the base temperature of the material, Is the actual speed of the strip steel, Is the reference speed of the strip steel, For the speed-temperature adjustment coefficient, In order to dynamically compensate for the coefficient of the dynamic, Is the reference speed.
  4. 4. A method for cold continuous rolling of high-grade non-oriented silicon steel based on the system as claimed in any one of claims 1-3, which is characterized by comprising the following steps of S1, preparing strip steel to be rolled with a first frame (F1), penetrating a six continuous rolling unit (2) after a steel coil is uncoiled on an uncoiler (1), penetrating strip steel into the first frame (F1), and rolling with high rolling reduction rate The rolling force is set within the range of 38% -45% Controlling the post tension to be 1.5-3.0 kg/mm < 2 > within the range of 4800-5500 kN, S2, performing cooperative rolling on the second frame (F2) to the sixth frame (F6), wherein the strip steel sequentially enters the second frame (F2) to the sixth frame (F6) for rolling, and the rolling reduction rate of each frame meets the following requirements > ≥ > > ≥ And (2) and More than or equal to 5 percent, the rolling force of each frame meets =0.85 To 0.95, and rolling force Decreasing as the frame number n increases, In the rolling process, setting the shape control targets of the second frame (F2) to the fourth frame (F4) as micro-medium waves, and controlling the display value of a shape meter to be in the range of-10I to +10I; setting the plate shape control targets of a fifth frame (F5) and a sixth frame (F6) to be micro double-sided waves, controlling the display value of a plate shape meter to be in the range of +15I to +30I, controlling the cooperative operation of tension and speed by a control system (L2), controlling the unit tension among the frames to smoothly increase from 1.5-3.0 kg/mm < 2 > of an outlet of the first frame (F1) to 12.0-18.0 kg/mm < 2 > of an inlet of the sixth frame (F6), adopting a speed step-up mode, namely, every 50-100 m/min of rolling speed, at the speed point to stably operate for 30-60 seconds in the speed point, controlling the growth of crystal grains of the washed steel band by a dynamic induction heating regulation and control system (L2) in the rolling process, heating the washed steel band by an induction heating device (4), heating the steel band according to the actual moving speed v of the product after the washing, and dynamically regulating the heating temperature to a coiling process of the steel band on a coiling machine (5) according to the required rolling formula, wherein the speed is kept stable, the surface of the pickled clean steel band is washed, the surface enters into an emulsion after the pickling device (3) after the rolling, and the surface is washed, and the crystal grains are washed.
  5. 5. The method according to claim 4, wherein in the step S4, the highest rolling speed is 450-750 m/min.
  6. 6. The method according to claim 4, wherein in step S6, the base temperature is 600-750 ℃, Said speed The temperature adjustment coefficient k is 0.5-2.0 ℃ min/m.

Description

System and method for cold continuous rolling of high-grade non-oriented silicon steel Technical Field The invention belongs to the technical field of metallurgical rolling, and particularly relates to a system and a method for cold continuous rolling of high-grade non-oriented silicon steel. Background The high-grade non-oriented silicon steel is a key material for manufacturing a driving motor of a new energy automobile and an iron core of a high-efficiency industrial motor. With the increase of the silicon content (generally more than 3.0 percent), the resistivity of the material is improved, the iron loss is reduced, but the problems of hardness increase, plasticity reduction and rapid increase of deformation resistance are brought at the same time, so that the strip breakage, edge breakage (edge breakage) and serious plate shape defect are extremely easy to occur in the cold rolling process, the production difficulty is extremely high, and the yield is low. At present, the stable production of the high-difficulty products in the industry mainly adopts a twenty-roller sendai Mi Ershan stand rolling mill to carry out multi-pass reversible rolling and a complex process of 'twice cold rolling and twice annealing'. The single-stand rolling mill utilizes the large reduction rate among the passes to generate deformation heat so as to improve the temperature of rolled pieces and improve the plasticity, however, the reversible rolling mode has slow production rhythm, long auxiliary time of threading, coil unloading and the like, and low production efficiency, and cannot meet the increasing mass and low-cost demands of the market on high-grade silicon steel. The other method eliminates work hardening, optimizes the structure by adding an intermediate anneal after the first cold rolling, and then performs the second cold rolling to reach the final thickness. Although the method can produce high-performance products, the process flow is long, the energy consumption is high, the equipment investment and the operation cost are huge, and the surface oxide layer generated by the intermediate annealing can cause the problems of unstable subsequent rolling, surface color difference and the like. Disclosure of Invention In view of the foregoing, there is a need in the art for a method and system for efficiently, stably and continuously producing high grade non-oriented silicon steel on a universal continuous rolling mill train. In order to achieve the above purpose, the present invention adopts the following technical scheme: The system for cold continuous rolling of the high-grade non-oriented silicon steel sequentially comprises an uncoiler, a six continuous rolling unit, an acid pickling device, an induction heating device, a coiling machine and a control system along a rolling line, wherein the six continuous rolling unit adopts a composite configuration of a one-frame eight-roller mill and five-frame six-roller mill, rollers are arranged into a fusiform composite roller shape, convexity of the rollers is adjusted in real time through a dynamic calculation model, the induction heating device is an intermediate-frequency induction heater, heating temperature is dynamically regulated and controlled according to actual speed of strip steel, and the control system is electrically connected with each key device and each detection system, so that the whole-flow cooperative control is realized. The cold continuous rolling method based on the system comprises the following steps of: s1, strip steel is prepared to be rolled with a first stand, the uncoiled strip steel enters a eighteen-roller mill, and initial large deformation is completed by a large rolling reduction of 38% -45%, a rolling force of 4800 kN-5500 kN and a rear tension of 1.5-3.0 kg/mm < 2 >; S2, the second frame and the sixth frame are rolled cooperatively according to the following process " >≥>>≥(Not less than 5%) "distribution reduction rate, rolling force according to=0.85~0.95、The ratio of the (0.55-0.70) is decreased; s3, roll application and plate shape sectional control, and a frame F2 F4 is targeted at "micro-wave" (-10)~+10),F5F6 targets "micro bilateral waves" (+15)~+30) Compensating the deformation of the roller through the fusiform roller and the convexity model; S4, carrying out cooperative operation on tension and speed, wherein the tension among the frames is gradually increased from 1.5-3.0 kg/mm < 2 > to 12.0-18.0 kg/mm < 2 >, and a step mode of stabilizing for 30-60 seconds every 50-100 m/min of lifting is adopted for the speed; s5, pickling and cleaning the surface of the strip steel, removing emulsion adhered in the rolling process, and avoiding influencing the subsequent heating effect; S6, dynamically adjusting and controlling the grain growth of the strip steel by dynamic induction heating, and dynamically adjusting heating parameters according to the actual speed of the strip steel by a temperature model to promote the uniform growth