CN112692058A - Rolling process for controlling thickness stability of non-oriented silicon steel - Google Patents
Rolling process for controlling thickness stability of non-oriented silicon steel Download PDFInfo
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- CN112692058A CN112692058A CN202110018336.0A CN202110018336A CN112692058A CN 112692058 A CN112692058 A CN 112692058A CN 202110018336 A CN202110018336 A CN 202110018336A CN 112692058 A CN112692058 A CN 112692058A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/46—Roll speed or drive motor control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/02—Winding-up or coiling
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Abstract
The invention discloses a rolling process for controlling the thickness stability of non-oriented silicon steel, and relates to the field of silicon steel thickness control methods. According to the invention, the rolling stability and the coil shape quality of the subsequent coiling process are ensured and the thickness stability of the non-oriented silicon steel is strictly controlled by reducing the temperature of the silicon steel finish rolling inlet and adjusting the production parameters of the rough rolling area, the finish rolling area and the coiling area. The rolling process provided by the invention obviously improves the thickness hit rate of the silicon steel, improves the rolling speed of the subsequent cold rolling process, reduces the fluctuation of the rolling force and improves the product quality.
Description
Technical Field
The invention relates to the field of silicon steel thickness control methods, in particular to a rolling process for controlling the thickness stability of non-oriented silicon steel.
Background
The non-oriented silicon steel is mainly applied to the field of motors and power transformers, and belongs to high-end products in the steel industry. The quality of the hot rolled coil product directly affects the rolling and the use conditions of the subsequent processes, especially the thickness control. The subsequent process of the silicon steel relates to cold rolling to about 0.6mm, the thickness specification of the hot rolled coil is 2.75mm, and the requirement on the thickness is strict. Once the thickness fluctuation directly influences the rolling speed and the rolling stability of the cold rolling process, scrap steel in the cold rolling process can be caused in severe cases, and economic loss is caused.
Disclosure of Invention
In order to solve the technical problems, the invention provides a rolling process for controlling the stability of the thickness of non-oriented silicon steel, and the rolling thickness of the silicon steel is stabilized.
In order to realize the technical purpose, the invention adopts the following scheme: the rolling process for controlling the thickness stability of the non-oriented silicon steel comprises the following steps:
step one, heating a zone: heating the raw materials in a heating furnace, wherein the firing temperature of the silicon steel is 1180 +/-10 ℃;
step two, rough rolling area: the silicon steel enters a rough rolling area after being discharged from a furnace, two rolling mills R1 and R2 are adopted for rough rolling, each rolling mill rolls three passes, the rolling reduction of the three passes of R1 is set to be 38.96mm, 10.62mm and 31.34mm respectively, and the rolling reduction of the three passes of R2 is set to be 32.61mm, 30.74mm and 18.70mm respectively; the temperature of the rough rolling outlet is 970 +/-15 ℃, a descaling box is not arranged at the rough rolling area outlet, and the outlet of the rough rolling area is opened by pre-flushing water;
step three, a finish rolling area: the rough-rolled cooled strip steel enters a finish rolling area, the finish rolling inlet temperature is 925-970 ℃, 7 rolling mills are arranged in the finish rolling area, a straight-through rolling process is adopted, and when the loop amount is unstable, the rolling force self-learning coefficient, the forward slip coefficient or the speed drop compensation coefficient are corrected;
step four, a coiling area: and a side guide plate is arranged at the inlet of the coiling machine, the opening degree of the side guide plate is adjusted during coiling, a pinch roll is arranged between the side guide plate and the coiling block, the front purging water and the cooling water of the pinch roll are opened, and the pinch roll adopts a non-whole-process pressing mode to obtain the non-oriented silicon steel with stable thickness.
Compared with the prior art, the invention has the beneficial effects that: the rolling process provided by the invention obviously improves the thickness hit rate of the silicon steel, improves the rolling speed of the subsequent cold rolling process, reduces the fluctuation of the rolling force and improves the product quality.
The preferred scheme of the invention is as follows:
the second pass rolling speed of R2 was 3.0m/s, and the third pass rolling speed of R2 was 4.0 m/s.
The steel biting rolling force of the rolling mill during rough rolling is 2500KN, and the steel biting speed ratio is 82%.
The threading speed of the strip steel is less than or equal to 10m/s, the rolling speed is less than or equal to 14m/s, and the steel throwing speed is limited to 12m/s during finish rolling.
The rolling area sets the advance rate of the roller way to be 1.110-1.190 and the lag rate of the roller way to be 0.710-0.910, so that the threading tension and the rolling tension are reduced.
The reduction of 7 stands of mill was 43.84%, 45.92%, 41.75%, 31.31%, 23.80%, 17.74% and 11.48%, respectively.
Drawings
FIG. 1 is a graph illustrating the hit rate of non-oriented silicon steel thickness provided in accordance with an embodiment of the present invention;
FIG. 2 is a graph showing the hit rate of the thickness of non-oriented silicon steel according to the comparative example of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention, but the present invention is not limited thereto.
The invention provides a rolling process for controlling the thickness stability of non-oriented silicon steel, which comprises the following steps:
step one, heating a zone: the chemical components of the raw materials comprise, by weight, 0.001-0.003% of C, 0.085-1.05% of Si, 0.18-0.22% of Mn, 0.0001-0.025% of P, 0.001-0.005% of S, 0.0001-0.004% of N, 0.1-0.35% of Als, and the balance Fe. Heating the raw materials in a heating furnace, wherein the steel burning temperature is 1180 +/-10 ℃.
Step two, rough rolling area: and (3) discharging the silicon steel out of the furnace, and then entering a rough rolling area, wherein the rough rolling adopts two rolling mills R1 and R2, and each rolling mill rolls for three passes. The load distribution of each pass cannot be too large, the situation of skidding is easy to occur due to too large load distribution, and the control difficulty of the warping buckle head is high. The load is small, the steel biting signal can not be activated easily, the possibility of disturbing model and program calculation exists, the rolling force required by the activated steel biting signal of the rolling mill in the program is changed from 3000KN to 2500KN, the load is small, and the influence on the whole width of the intermediate billet or the edge quality of the strip steel can be caused directly. The width reduction amount of the rough rolling area of the silicon steel in the rolling process is controlled within the difference between the width of the plate blank and the nominal width of the finished product strip steel, and the optimal width is 12-25 mm. The thickness of the intermediate billet is set to be 40mm, the three pass reduction of rough rolling R1 are set to be 38.96mm, 10.62mm and 31.34mm respectively, and the three pass reduction of R2 are set to be 32.61mm, 30.74mm and 18.70mm respectively.
The second pass rolling speed of R2 is 3.0m/s, the third pass rolling speed of R2 is 4.0m/s, and the bite speed proportion of the rolling mill in the rough rolling area is 82%. The bite speed ratio is the ratio of the rolling speed of the rolling mill at the time of bite to the normal rolling speed, for example, the rolling speed is 4.5m/s, and the bite speed is 4.5 × 0.82=3.69 m/s. In the case of no descaling boxes at the R1 and R2 outlets, the roughing outlet pre-flush was opened. The outlet temperature of rough rolling is 970 ℃, the hit rate of 970 +/-15 ℃ reaches 90 percent, and the qualified products are sent to a finish rolling area.
Step three, a finish rolling area: and (3) the strip steel after rough rolling and cooling enters a finish rolling area, and the inlet temperature of the finish rolling area is 925-970 ℃. The finish rolling area adopts a straight-through rolling process, the intermediate blank sent by rough rolling directly enters a finish rolling rack without coiling, the thickness of the intermediate blank is between 30 and 40mm, the length of the intermediate blank is related to the length of a plate blank, preferably about 60m, and the thickness of the finish rolled strip steel is the thickness which can be continuously required subsequently, preferably between 1.4 and 12 mm. The straight-tube rolling process effectively avoids overhigh temperature of the intermediate coil in a hot coil box mode. The hot coil box mode is a mode in which an intermediate slab fed by rough rolling is formed into a coil by a bending roll or the like before entering a finishing mill, and is gradually opened at a rolling speed of finish rolling.
The finish rolling area is mainly used for optimizing the load distribution, the deformation resistance coefficient and the rolling force self-learning coefficient of each rack, and the situations of width and thickness fluctuation and rolling instability caused by unstable loop quantity are avoided. The deformation resistance is adjusted according to the principle that the thickness of the head part is thinner than 0.2 +/-0.05 mm.
Because the temperature of the rough rolling outlet is lower, in order to avoid threading and over-high rolling speed of a finish rolling area, the maximum threading speed of the strip steel is limited to 10m/s, the maximum rolling speed is limited to 14m/s, and the maximum steel throwing speed is limited to 12 m/s.
The inlet of the finish rolling mill is respectively provided with a side guide plate, the opening degree of the F1-F3 side guide plates is +35 +/-2 mm of the nominal width of the strip steel, and the opening degree of the F4-F7 side guide plates is +35 +/-5-8 mm of the nominal width of the strip steel, so that the phenomenon that the side guide plates are stuck with meat is avoided.
And cooling water between the rolling mills is completely closed. Because the silicon steel material is softer, the head and the tail are wider, the side guide plates of each rolling mill are easy to stick meat during finish rolling, descaling water is opened, and steel foreign matters are prevented from being pressed in.
The finish rolling area adopts 7 rolling mills, and the rolling reduction of the 7 rolling mills is 43.84%, 45.92%, 41.75%, 31.31%, 23.80%, 17.74% and 11.48% respectively. The total number of the 7 rolling mills is 6 loops, and the angle set values of the loops are 22 degrees, 20 degrees and 20 degrees respectively. Due to the fact that the non-oriented silicon steel is soft in material, the conditions that flow per second between racks is not accurate and the angle of a loop is abnormal often occur due to temperature changes of a roller system during production and the like, the rolling force self-learning coefficient, the forward slip coefficient or the speed drop compensation coefficient are corrected in time, and rolling stability is guaranteed. The rolling force self-learning coefficient adjustment range is as follows: 0.78-0.83 percent of F1, 0.84-0.89 percent of F2, 0.90-0.98 percent of F3, 0.99-1.03 percent of F4, 1.04-1.10 percent of F5, 1.11-1.18 percent of F6, 1.19-1.23 percent of F7, and the adjustment range of the forward slip coefficient is +/-0.02, (forward slip means that the strip steel enters a rolling mill to be rolled, for example, the thickness is 20mm before rolling, the speed after rolling is 12mm, the speed of the strip steel at the inlet of the rolling mill is smaller than that of the strip steel at the outlet, and the adjustment range of the speed reduction compensation coefficient is +/-0.01. The speed drop compensation means that a speed drop process exists in the rolling mill at the moment of steel biting, for example, the linear speed of a roller is 12m/s when the roller does not bite steel, and then the linear speed is instantly reduced to 11.8m/s at the moment of steel biting due to the effect of resistance, and the speed drop is probably reduced to 11.8 m/s. The speed drop has great influence on rolling stability, particularly the second flow, so that the speed drop at the moment of biting steel needs to be compensated, namely the speed drop is increased by a little on the basis of 12m/s and is set to be about 12.2m/s, and the linear speed of the roller can reach 12m/s when biting steel.
Step four, a coiling area: the inlet of the coiling machine is provided with a side guide plate, the waiting position opening degree of the side guide plate is determined according to the width of the rolled non-oriented silicon steel finished product, for example, the width of the finished product is 1230mm, and the opening degree of the strip steel before reaching the side guide plate is set to be 1230+100+75 +/-5 mm, which is 10mm larger than that of the strip steel when other steel grades are coiled. The silicon steel is made of soft materials, so that meat is easy to fall off and stick to the side guide plates when the side guide plates are cut and rubbed, the opening degree of the side guide plates of the coiling machine is controlled to be larger when the silicon steel is rolled relative to other steel types, and the phenomenon that the side guide plates are cut and rubbed due to deviation of strip steel is avoided, and the meat sticking is caused. And (3) throwing steel by using an F7 rack in the rolling process, and setting the opening degree of the side guide plate to be 1230+15 +/-5 mm after the strip steel reaches a deceleration point, wherein the opening degree is 5-8 mm larger than that of other steel types when the strip steel is coiled.
The method comprises the following steps that 9 groups of roller ways are counted from an F7 machine frame to a coiling machine in a finish rolling area, the lead rates of the roller ways are respectively set to be 1.120-1.190, numerical values are sequentially increased, the lag rates of the roller ways are respectively set to be 0.710-0.910, and the numerical values are sequentially increased. The forward rate and the lag rate refer to the linear velocity of a roller way relative to the forward speed of the strip steel, and the linear velocity of the roller way must be larger than the forward speed of the strip steel in the strip threading process, so that the strip steel is straightened, the strip steel smoothly enters a coiling machine on the roller way, and the sleeve is prevented from being lifted on the roller way. Similarly, after finish rolling and steel throwing, the tail part of the strip steel does not enter the recoiling machine completely, and the linear speed of the roller way is smaller than the advancing speed of the strip steel, so that the strip steel can stably advance on the roller way.
The opening degree of the side guide plate is properly released according to the condition of sparks scraped by the field strip steel and the side guide plate, the phenomenon that the side guide plate is stuck with meat or the strip steel is scratched due to the fact that a side guide plate clamp is tight and the silicon steel material is soft is avoided, meanwhile, front purging water of a pinch roll and cooling water of the pinch roll arranged between the side guide plate and a winding drum are opened, the phenomenon that the strip steel is wound through a winding roll due to the fact that the pinch roll is stuck with meat is avoided, when the meat sticking phenomenon occurs, the pinch roll is in a non-full-process pressing mode, namely the pinch roll presses the strip steel after an F7 machine frame throws the steel in the strip threading process, and the.
Comparative example
The steel burning temperature is set to 1190 +/-10 ℃, the rolling speed of the second pass of rough rolling R2 is 3.5m/s, the rolling speed of the third pass of R2 is 4.5m/s, the steel biting speed ratio is 92%, the pre-flushing water at the rough rolling outlet is closed, and the temperature at the rough rolling outlet is set to 1010-1030 ℃.
The thickness hit rate of the non-oriented silicon steel obtained by the rolling process provided by the invention is shown in fig. 1, and fig. 2 is a thickness hit rate curve diagram of the non-oriented silicon steel obtained by a comparative example. The comparison of the graphs shows that the thickness hit rate curve of the non-oriented silicon steel is smooth by the process provided by the invention, and the numerical value is stabilized at 2.65-2.75 mm.
The results of comparing the hit rate of the thickness of the non-oriented silicon steel in the examples and the comparative examples, the hit rate of the outlet temperature of the rough rolling after the reduction of the rolling speed by the rough rolling, and the like are shown in table 1. The thickness fluctuation is small, the rolling speed of cold rolling is obviously improved, the rolling force fluctuation is small, and the product quality is improved.
TABLE 1 comparison of Performance parameters of non-oriented silicon steels
| Hit rate (%) for thickness. + -.30 μm | Hit rate (%) for thickness. + -. 50 μm | Hit rate (%) at thickness. + -. 100. mu.m | Hit rate (%) at outlet temperature of rough rolling. + -. 20 ℃ C | |
| Comparative example | 84.839 | 96.329 | 99.287 | 73.677 |
| Examples | 87.996 | 97.088 | 99.277 | 89.799 |
Finally, it is noted that: the above-mentioned list is only the preferred embodiment of the present invention, and naturally those skilled in the art can make modifications and variations to the present invention, which should be considered as the protection scope of the present invention provided they are within the scope of the claims of the present invention and their equivalents.
Claims (6)
1. A rolling process for controlling the thickness stability of non-oriented silicon steel is characterized by comprising the following steps:
step one, heating a zone: heating the raw materials in a heating furnace, wherein the firing temperature of the silicon steel is 1180 +/-10 ℃;
step two, rough rolling area: the silicon steel enters a rough rolling area after being discharged from a furnace, two rolling mills R1 and R2 are adopted for rough rolling, each rolling mill rolls three passes, the rolling reduction of the three passes of R1 is set to be 38.96mm, 10.62mm and 31.34mm respectively, and the rolling reduction of the three passes of R2 is set to be 32.61mm, 30.74mm and 18.70mm respectively; the temperature of the rough rolling outlet is 970 +/-15 ℃, a descaling box is not arranged at the rough rolling area outlet, and the outlet of the rough rolling area is opened by pre-flushing water;
step three, a finish rolling area: the rough-rolled cooled strip steel enters a finish rolling area, the finish rolling inlet temperature is 925-970 ℃, 7 rolling mills are arranged in the finish rolling area, a straight-through rolling process is adopted, and when the loop amount is unstable, the rolling force self-learning coefficient, the forward slip coefficient or the speed drop compensation coefficient are corrected;
step four, a coiling area: and a side guide plate is arranged at the inlet of the coiling machine, the opening degree of the side guide plate is adjusted during coiling, a pinch roll is arranged between the side guide plate and the coiling block, the front purging water and the cooling water of the pinch roll are opened, and the pinch roll adopts a non-whole-process pressing mode to obtain the non-oriented silicon steel with stable thickness.
2. The rolling process for controlling the thickness stability of the non-oriented silicon steel as claimed in claim 1, wherein the second pass rolling speed of R2 is 3.0m/s, and the third pass rolling speed of R2 is 4.0 m/s.
3. The rolling process for controlling the thickness stability of non-oriented silicon steel as claimed in claim 1, wherein the bite rolling force of the rolling mill during rough rolling is 2500KN, and the bite speed ratio is 82%.
4. The rolling process for controlling the thickness stability of the non-oriented silicon steel as claimed in claim 1, wherein the threading speed of the strip steel during finish rolling is less than or equal to 10m/s, the rolling speed is less than or equal to 14m/s, and the steel throwing speed is limited to 12 m/s.
5. The rolling process for controlling the thickness stability of the non-oriented silicon steel as claimed in claim 1, wherein the roll-up zone is set to have an advance rate of 1.110-1.190 and a lag rate of 0.710-0.910, so as to reduce the threading tension and the rolling tension.
6. The rolling process for controlling the thickness stability of non-oriented silicon steel as claimed in claim 1, wherein the reduction of 7 mills is 43.84%, 45.92%, 41.75%, 31.31%, 23.80%, 17.74% and 11.48%, respectively.
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| CN113798331A (en) * | 2021-09-15 | 2021-12-17 | 山西太钢不锈钢股份有限公司 | Thin-specification strip steel or silicon steel tail coiling control process |
| CN114433626A (en) * | 2022-01-21 | 2022-05-06 | 安阳钢铁股份有限公司 | Method for improving threading stability of hot continuous rolling thin-specification strip steel |
| CN114472518A (en) * | 2021-12-24 | 2022-05-13 | 安阳钢铁股份有限公司 | Method for improving thickness precision of hot continuous rolling non-oriented silicon steel |
| CN114653757A (en) * | 2022-04-06 | 2022-06-24 | 中天钢铁集团(南通)有限公司 | Control method for high-speed wire free-cutting steel material shape |
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| CN114653757B (en) * | 2022-04-06 | 2023-08-18 | 中天钢铁集团(南通)有限公司 | High-speed wire free-cutting steel material type control method |
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Application publication date: 20210423 |