Continuous rolling strip breakage prevention unit for silicon steel

Abstract

The utility model discloses a strip breakage prevention unit for continuous rolling of silicon steel. The strip breakage prevention unit comprises a first uncoiler, a second uncoiler, a welding machine, a loop, a continuous mill, a flying shear and a coiler which are sequentially arranged in the running direction of strip steel. An edge cutting device, a deviation rectifying device and a heating device are sequentially arranged between the loop and the continuous rolling mill, and cooling devices are respectively arranged among the rear four racks of the continuous rolling mill; the trimming device is a disc type trimming shear; the deviation rectifying device is a double-roller type deviation rectifying device; the heating device is an induction heating device. The device has the beneficial effects that the occurrence of silicon steel strip breakage in the subsequent rolling process is reduced and the yield of the strip steel is improved through the combined measures of trimming, rectifying and preheating the strip steel before rolling.

Description

Technical Field

[0001] The utility model relates to the technical field of steel rolling, in particular to a silicon steel continuous rolling anti-breaking belt unit. Background Art

[0002] Silicon steel strip material is brittle due to its high silicon content, and is prone to strip breakage during the cold rolling process. If a strip breakage occurs during continuous rolling of silicon steel, the entire unit must stop running. Not only is the strip breakage troublesome and time-consuming to handle, which reduces production efficiency, but the shearing of the broken strip also leads to a decrease in the yield rate of silicon steel. Strip breakage during silicon steel rolling has become an industry problem that restricts its stable, continuous and efficient production. Summary of the invention

[0003] The utility model aims to provide a silicon steel continuous rolling anti-strip breakage machine unit to prevent the occurrence of strip breakage during the continuous rolling production process of silicon steel strips and improve the yield rate in view of the deficiencies in the prior art.

[0004] The technical solution adopted by the utility model is: a silicon steel continuous rolling anti-breaking strip unit, including a first uncoiler, a second uncoiler, a welding machine, a looper, a continuous rolling mill, a flying shear and a coiler which are arranged in sequence along the running direction of the strip; a trimming device, a deviation correction device and a heating device are arranged in sequence between the looper and the continuous rolling mill, and cooling devices are respectively arranged between the rear four frames of the continuous rolling mill.

[0005] According to the above solution, the trimming device is a disc-type trimming shear.

[0006] According to the above scheme, the deviation correction device is a double-roller deviation correction device.

[0007] According to the above solution, the heating device is an induction heating device.

[0008] According to the above scheme, the number of stands of the continuous rolling mill is 5 to 7.

[0009] According to the above scheme, each frame is arranged with a roll gap lubrication cooling emulsion injection device and a roll cooling emulsion injection device.

[0010] According to the above solution, the cooling device is an emulsion spraying device.

[0011] The beneficial effects of the utility model are:

[0012] Based on the analysis of the influencing factors of silicon steel strip breakage, the utility model proposes that a trimming device, a deviation correction device and a heating device are arranged in sequence between the looper and the continuous rolling mill in the rolling unit, and the occurrence of silicon steel strip breakage in the subsequent rolling process is minimized by the combined measures of trimming, deviation correction and preheating the strip before rolling. The trimming is used to remove defects such as edge cracks and burrs to prevent edge defects from inducing cracks and strip breakage in the subsequent rolling process, and the deviation correction is used to center the strip to prevent the strip from running off in the subsequent rolling process and causing asymmetric rolling to break the strip. The preheating is used to improve the plasticity of the strip to prevent the strip from brittle fracture during the subsequent rolling. The utility model can effectively prevent the strip from breaking during the subsequent rolling, improve production stability and production efficiency, and ensure the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The figure is a flow chart of the method for preventing strip breakage in the continuous rolling production process of silicon steel.

[0014] Figure 2 This is the layout diagram of the silicon steel continuous rolling anti-break belt unit.

[0015] Among them: 1. Strip steel; 2. First uncoiler; 3. Second uncoiler; 4. Welding machine; 5. Looper; 6. Disc-type trimming shear; 7. Double-roller type deviation correction device; 8. Induction heating device; 9. Continuous rolling mill; 91. Roller gap lubrication cooling emulsion injection device; 92. Roller cooling emulsion injection device; 93. Emulsion injection device; 10. Flying shear; 11. Coiler. DETAILED DESCRIPTION

[0016] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] like Figure 1 A method for preventing strip breakage in a continuous rolling production process of silicon steel is shown, wherein the silicon steel raw material coil is unrolled and then welded head-to-tail to form a continuous strip steel 1, and then sequentially subjected to rolling, shearing and coiling processes to obtain a silicon steel finished coil;

[0018] The continuous strip steel 1 is first trimmed before rolling to remove defects on the edge of the strip steel 1, and then the strip steel 1 is corrected to be centered, and then the strip steel 1 is preheated to a set temperature before rolling;

[0019] During the rolling process of the strip 1, the rough roller working roll is used for rolling in the first pass, the emulsion concentration used is 3% to 8%, the emulsion flow rate of each pass is 2000 to 4000 L / min, and the pass reduction rate is 25% to 40%;

[0020] The strip 1 is rolled by smooth working rolls in the subsequent pass, the emulsion concentration is 1% to 3%, the emulsion flow rate of each pass is 4000 to 8000 L / min, and the pass reduction rate is 10% to 30%.

[0021] In the utility model, the defects such as edge cracks and burrs of the steel strip 1 are removed by trimming, so that the edge defects can be prevented from inducing cracks and causing strip breakage during the subsequent rolling process. The steel strip 1 is centered by performing a deviation correction process, that is, the width center of the steel strip 1 is ensured to coincide with the center of the unit as much as possible, so that the steel strip 1 can be prevented from running off during the subsequent rolling process and causing asymmetric rolling and strip breakage; the steel strip 1 is preheated to a set temperature before rolling, and the preheating can improve the plasticity of the steel strip 1 and prevent the steel strip 1 from brittle fracture during the subsequent rolling.

[0022] In the utility model, the thickness of the silicon steel strip 1 raw material is 1.8-2.7 mm; the thickness of the silicon steel finished product is 0.18-0.5 mm, and the silicon content in the silicon steel finished product is 2.5%-3.5%.

[0023] In the utility model, the trimming width of the steel strip 1 is 5-20 mm / edge, the deviation correction accuracy is ±1 mm, and the preheating temperature of the steel strip 1 is 50-300°C.

[0024] In the utility model, the rolling entrance speed of the strip steel 1 is 60-200 m / min.

[0025] In the present invention, the total number of rolling passes of the strip steel 1 is 5 to 7 passes, the latter passes include the last 3 passes, and the other passes are all former passes.

[0026] In the utility model, rough roller working roller, small flow rate and high concentration emulsion, large pass reduction rate and high temperature rolling are used in the previous pass, specifically: the rough roller working roller used in the previous pass is a working roller with a roughness of 1 to 4 μm, the emulsion concentration used is 3% to 8%, the emulsion flow rate of each pass is 2000 to 4000 L / min, the pass reduction rate is 25% to 40%, and the pass outlet strip steel 1 temperature is 100 to 300°C. The rough roller working roller, small flow rate emulsion cooling, and large pass reduction rate produce a large deformation temperature rise, ensuring that the strip steel 1 has a high temperature during the previous pass rolling process to prevent brittle fracture; at the same time, by using a high concentration emulsion to ensure a high roll gap lubrication ability, reduce the roll gap friction coefficient and rolling pressure, which is beneficial to the strip steel 1 plate shape control and thickness control, and avoid strip breakage due to excessive adjustment of the strip steel 1 plate shape or thickness control system.

[0027] In the utility model, smooth working rolls, large flow rate and low concentration emulsion, small pass reduction rate and relatively low temperature rolling are adopted in the latter pass, specifically: the smooth working rolls adopted in the latter pass are working rolls with a roughness of 0.1-0.5 μm, the emulsion concentration is 1%-3%, the emulsion flow rate of each pass is 4000-8000 L / min, the pass reduction rate is 10%-30%, and the temperature of the strip steel 1 at the exit of the pass is 50-200°C. Since the temperature of the strip 1 of the front frame is high and the emulsion concentration is high, the emulsion viscosity is relatively large, there is a lot of iron powder, and there is a lot of oil sludge on the surface of the strip 1. Therefore, a large flow rate and a low concentration emulsion are required in the later pass to ensure a high roll gap lubrication and cooling capacity and to flush the surface of the strip 1; a large flow rate of emulsion and a small pass reduction rate are used to reduce the temperature rise of the strip 1 and reduce the temperature of the strip 1 to the required coiling temperature to prevent excessive precipitation of the second phase inside the silicon steel strip 1 and reduce the magnetic properties of the silicon steel; the use of smooth roller working rollers and a small pass reduction rate can further improve the surface quality of the strip 1 and improve the thickness and plate shape control accuracy of the strip 1.

[0028] like Figure 2 The silicon steel continuous rolling anti-breaking strip unit shown in the figure includes a first uncoiler 2, a second uncoiler 3, a welding machine 4, a looper 5, a continuous rolling mill 9, a flying shear 10 and a coiler 1 which are arranged in sequence along the running direction of the strip 1; a trimming device, a deviation correction device and a heating device are arranged in sequence between the looper 5 and the continuous rolling mill 9, and cooling devices are arranged respectively between the rear four frames of the continuous rolling mill 9.

[0029] Preferably, the trimming device is a disc-type trimming shear 6 , the deviation correction device is a double-roller deviation correction device 7 , and the heating device is an induction heating device 8 .

[0030] Preferably, the number of stands of the continuous rolling mill 9 is 5 to 7, and each stand is provided with a roll gap lubricating cooling emulsion spraying device 91 and a roll cooling emulsion spraying device 92 .

[0031] Preferably, the cooling device arranged between the rear four frames of the continuous rolling mill 9 is an emulsion spraying device 93 .

[0032] In the utility model, various equipment such as uncoiler, welding machine 4, looper 5, continuous rolling mill 9, flying shear 10, coiler 1, disc trimming shear 6, double-roller deviation correction device 7, induction heating device 8 and emulsion injection device 93 are all mature equipment in the industry, and their structures and functions are all existing technologies, which will not be repeated here.

[0033] Embodiment 1

[0034] The method is used in the continuous rolling production process of silicon steel of a certain grade and specification, wherein the raw material thickness of the silicon steel strip is 2.3mm, the finished product thickness is 0.35mm, and the silicon content is 3.2%; the trimming width of the strip before rolling is 10mm / side, the correction accuracy is ±1mm, the strip preheating temperature is 150℃, the rolling entrance speed is 150m / min, the total number of rolling passes is 6, the roughness of the rough roller working roll used in the 1st to 3rd pass is 2μm, the emulsion concentration is 5%, and the emulsion flow rate of each pass is 3500 L / min, the pass reduction rate of each pass is 32.28%, 33.24%, 29.92%, and the outlet strip temperature of each pass is 170℃, 220℃, 260℃; the roughness of the smooth roll working roll used in 4-6 passes is 0.2μm, the emulsion concentration is 1.5%, the emulsion flow rate of each pass is 5000L / min, the pass reduction rate of each pass is 26.93%, 21.9%, 15.83%, and the outlet strip temperature of each pass is 180℃, 130℃, 90℃. According to the on-site production verification, the method can significantly reduce the number of strip breaks in the rolling of silicon steel of this grade and specification. Before the method, the strip broke about 15 times / month, and after the method, the strip broke about 3 times / month, and the strip break rate was reduced by about 80%, which increased the production efficiency by about 5% and the yield rate by about 1.5%.

[0035] Embodiment 2

[0036] like Figure 2 The silicon steel continuous rolling anti-breaking strip unit shown in the figure comprises a first uncoiler 2, a second uncoiler 3, a welding machine 4, a looper 5, a disc-type trimming shear 6, a double-roller type deviation correction device 7, an induction heating device 8, a continuous rolling mill 9, a flying shear 10 and a coiler 11 which are arranged in sequence along the running direction of the strip steel 1, wherein the continuous rolling mill 9 is a six-stand continuous rolling mill, each stand is arranged with a roll gap lubrication cooling emulsion injection device 91 and a roll cooling emulsion injection device 92, and emulsion injection devices 93 are respectively arranged between the third stand and the fourth stand, between the fourth stand and the fifth stand, and between the fifth stand and the sixth stand.

[0037] During the production process, the raw steel coil is uncoiled by the first uncoiler 2 or the second uncoiler 3, and then the tail of the previous raw steel coil and the head of the next raw steel coil are welded at the welding machine 4 to form a continuous strip steel 1, and then the strip steel 1 continuously passes through the looper 5 and enters the disc-type trimming shear 6 for trimming, and after being corrected by the double-roller type deviation correction device 7, it enters the induction heating device 8 for preheating, and then enters the continuous rolling mill 9 for rolling in turn, and is sheared by the flying shear 10 and then coiled by the coiler 11; wherein, the roll gap lubrication cooling emulsion injection device 91 and the roll cooling emulsion injection device 92 respectively spray emulsion to the roll gap and the roll for roll gap lubrication cooling and roll cooling, and the emulsion injection device 93 is arranged between the third frame and the fourth frame, between the fourth frame and the fifth frame, and between the fifth frame and the sixth frame, respectively, for spraying emulsion on the surface of the strip steel to increase the cooling capacity of the strip steel.

[0038] The utility model adopts rough roller working roller, small flow emulsion cooling and large pass reduction rate in the front rolling pass to make the strip steel produce a large deformation temperature rise, thereby ensuring that the strip steel has a high temperature in the front rolling pass process to prevent brittle fracture; by adopting high-concentration emulsion to ensure high roll gap lubrication ability, reduce the roll gap friction coefficient and rolling pressure, which is beneficial to the strip steel plate shape control and thickness control, and avoids strip breakage due to excessive adjustment of the strip steel plate shape or thickness control system.

[0039] The utility model adopts the method of smooth working roll, large flow rate and low concentration emulsion and small reduction rate in the last pass of rolling, which not only ensures high roll gap lubrication and cooling capacity, but also plays the role of washing the surface of the strip. The large flow rate of emulsion and small reduction rate are used to reduce the temperature rise of the strip, reduce the temperature of the strip to the required coiling temperature, and prevent the excessive precipitation of the second phase inside the silicon steel strip and reduce the magnetic properties of the silicon steel; the smooth working roll and small reduction rate can further improve the surface quality of the strip and improve the thickness and plate shape control accuracy of the strip.

[0040] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field. Finally, it should be noted that the above are only preferred embodiments of the utility model and are not used to limit the utility model. Although the utility model is described in detail with reference to the embodiments, for the technical personnel in this field, they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein by equivalents. However, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A silicon steel continuous rolling anti-strip breakage unit, comprising a first uncoiler, a second uncoiler, a welder, a looper, a continuous rolling mill, a flying shear and a coiler arranged in sequence along the running direction of the strip; characterized in that: A trimming device, a deviation correcting device and a heating device are arranged in sequence between the looper and the continuous rolling mill, and cooling devices are arranged between the rear four frames of the continuous rolling mill.

2. The silicon steel continuous rolling anti-strip breaking unit according to claim 1, characterized in that: The trimming device is a disc-type trimming shear.

3. The silicon steel continuous rolling anti-strip breaking unit according to claim 1, characterized in that: The deviation correction device is a double-roller deviation correction device.

4. The silicon steel continuous rolling anti-strip breaking unit according to claim 1, characterized in that: The heating device is an induction heating device.

5. The silicon steel continuous rolling anti-strip breaking unit according to claim 1, characterized in that: The number of stands of the continuous rolling mill is 5 to 7.

6. The silicon steel continuous rolling anti-strip breaking unit according to claim 1, characterized in that: Each frame is provided with a roll gap lubricating cooling emulsion injection device and a roll cooling emulsion injection device.

7. The silicon steel continuous rolling anti-strip breaking unit according to claim 6, characterized in that: The cooling device is an emulsion spraying device.

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