Method for quickly eliminating foreign matters on furnace roller

Abstract

The invention belongs to the technical field of iron and steel smelting, and particularly relates to a method for rapidly eliminating furnace roller foreign matter. Comprising the following steps: (1) determining the position of a foreign matter according to the condition of manually shifting a CPC deviation rectifying device; (2) selecting strip steel with proper specification and high hardness for production; (3) correcting the roller diameter of a furnace roller in the annealing furnace in the production process, and meanwhile, finely adjusting a CPC deviation rectifying device for assistance to eliminate the surface defects of the strip steel; and (4) normal production parameters are recovered. The method is low in cost, good in effect and small in influence on productivity of a production line, can quickly eliminate foreign matters in the furnace roller of the continuous annealing furnace, avoids shutdown blow-in, saves fund and productivity loss caused by shutdown blow-in treatment of the furnace roller, does not need to modify equipment, avoids influence of frequent speed increase and decrease on productivity of a unit, ensures continuous and stable production of the unit, and is suitable for industrial production. Meanwhile, foreign matters on the surface of the furnace roller are eliminated, product surface quality is guaranteed, production efficiency is improved, and benefits of enterprises are remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of steel smelting, and in particular relates to a method for quickly eliminating foreign matter on a furnace roller. Background Art

[0002] The continuous annealing furnace is a device used for heat treatment of metal materials. It is usually used to remove internal stress, improve the toughness of materials and improve their physical properties. It is a key industrial equipment on the cold rolling continuous annealing production line. Due to continuous use or the influence of the conditions in the furnace, foreign matter may adhere to the surface of the furnace roller in the annealing furnace. The presence of foreign matter in the furnace roller will be copied to the surface of the strip, forming defects. In severe cases, it will form a hand-feeling mark, affecting the surface quality of the strip. The accumulation of a large number of irregular foreign matter will also affect the control of the strip in the furnace, which is easy to deviate and affect normal production. In addition, in production, the continuous annealing furnace is a sealed space, and people cannot enter the furnace to deal with foreign matter on the furnace roller. There are many furnace rollers of the same roller system in the annealing furnace, which makes it difficult to troubleshoot. Therefore, once pitting and rubbing defects appear on the surface of the strip, the previous troubleshooting method takes 1-2 days, during which the surface quality of batch products is not up to standard. If the foreign matter cannot be handled online, the furnace needs to be shut down, affecting production for at least 5 days; manual entry into the furnace for cleaning costs about 200,000 each time, causing huge economic losses. Therefore, it becomes crucial to develop a fast and efficient method to eliminate foreign matter from furnace rollers online.

[0003] At present, Chinese patent 201610562173.1 discloses a method for alleviating the degree of furnace roller nodules and post-treatment of furnace roller nodules. The present invention is applicable to the method for alleviating the degree of furnace roller nodules and post-treatment of furnace roller nodules in the production of cold-rolled silicon steel, and is controlled from the aspects of strictly controlling the oxide scale of hot-rolled raw steel plates, normalizing furnace heating temperature control, oxidizing atmosphere control, steel plate temperature control, production operation sequence control and regular grinding of rollers. The diameter of the online furnace roller is measured regularly, and the number of revolutions of the furnace roller whose diameter changes after wear is adjusted; by optimizing the production process and process parameters, different treatment methods are adopted according to the furnace roller nodulation situation, the degree of furnace roller nodules is effectively alleviated, the production rhythm is accelerated, the yield of cold-rolled silicon steel is improved, and the production cost is reduced.

[0004] At present, Chinese patent 201210079299.5 discloses a method for treating furnace roller nodules. After the machine is shut down, the method marks the strip at the furnace outlet, rotates the furnace roller, and determines the furnace roller number and the transverse width position of the furnace roller nodules according to the furnace roller nodule marks worn on the strip; then prepares a new strip transition roll, which is an electrical steel strip roll of the same material, and punches holes on the new strip transition roll, with a hole diameter of 5-2.5mm, and the edge of the hole is flush with the strip, so that the holes are distributed in the entire plate width direction; according to the nodule width position reflected on the strip, the strip position with the hole group of the corresponding width is stopped at the furnace roller, the strip tension is removed, and the strip sags to form a wrap angle with the furnace roller; the furnace roller is rotated slowly alone, so that the furnace roller rotates relative to the strip, and when the furnace roller nodule marks rub against the holes on the surface of the strip, they will protrude from the surface of the strip, and will be removed by the edge of the hole when rotating.

[0005] The above patents require shutdown for inspection. At the same time, the previous method of increasing or decreasing the speed of the grinding roller cannot quickly eliminate the rubbing marks in the furnace, resulting in a long processing time for the rubbing marks in the furnace and a large number of defective products. At the same time, it seriously affects the production capacity of the production line. When only the correction roller is used, the friction between the strip and the furnace roller only exists in a single direction, and there is a dead angle. It is necessary to provide a method that does not require shutdown and can quickly, efficiently and comprehensively eliminate foreign matter from the annealing furnace roller. Summary of the invention

[0006] The purpose of the present invention is to provide a method for quickly eliminating foreign matter from furnace rollers to solve the problems existing in the prior art.

[0007] The technical solution adopted by the present invention to solve its technical problem is:

[0008] A method for quickly removing foreign matter from a furnace roller comprises the following steps:

[0009] (1) Determine the location of the foreign body based on the situation of the artificial offset CPC correction device;

[0010] (2) Select strip steel with appropriate specifications and high hardness for production;

[0011] (3) During the production process, the diameter of the rollers in the annealing furnace is corrected, and the CPC correction device is fine-tuned to assist in eliminating surface defects of the strip;

[0012] (4) Restore normal production parameters.

[0013] Furthermore, the method for determining the position of the foreign matter in step (1) is to lock the position of the foreign matter on the annealing furnace roller according to the situation of manually offsetting the CPC correction device, observe the position change of the defect on the strip, and use the CPC correction device in the furnace area to manually offset each section of the strip. If the defect is offset forward and backward, the position of the furnace roller where the defect occurs is determined, indicating that there is a foreign matter at this location of the furnace roller, and treatment is performed at this location.

[0014] Furthermore, in step (2), the strip steel is ordinary carbon steel with a carbon content of 0.015%, a thickness of 1.0-1.5 mm, and a width of 1000-1300 mm.

[0015] Furthermore, during the production process of the strip steel, the strip steel temperature is controlled at 600-700°C to prevent the strip steel from buckling due to excessive temperature when foreign matter is processed online.

[0016] Furthermore, during the strip production process, the strip is made to run in the furnace area at a speed of 60 to 100 mpm to prevent it from running off the track and maintain stability during production.

[0017] Furthermore, during the strip production process, a speed difference of 0.63% is generated between the furnace rolls and the strip.

[0018] Furthermore, in step (3), the method for correcting the roller diameter of the furnace roll in the annealing furnace is to adjust the diameter parameter of the furnace roll in contact with the defective surface of the strip in the furnace roll transmission system, the adjustment base is 5 mm, and the roller diameter cycle is set to 795-800-805-800-795 mm, so that the strip and the furnace roll generate friction along the rolling direction and the reverse rolling direction;

[0019] At the same time, by manually setting the CPC correction device to an offset of -20 to 0 to 20 mm, the strip is assisted to slide slightly along the axial direction of the furnace roller, thereby generating axial friction. Through the combined effect of different friction forces in the front, back, left and right directions, foreign matter on the furnace roller disappears quickly.

[0020] Furthermore, before restoring normal production parameters in step (4), the surface condition of the strip is first observed. If the surface defects of the strip are eliminated, it means that the foreign matter on the furnace roller has been eliminated, and the furnace roller diameter and CPC correction device are restored to normal production parameters; if the surface defects of the strip are not eliminated, return to step (2).

[0021] The present invention has the following beneficial effects:

[0022] The present invention uses a method with the lowest cost, the best effect and the least impact on the production line capacity to treat foreign matter on the surface of the furnace roller. By simulating and adjusting the diameter of the furnace roller, changing the linear speed of the furnace roller, and then realizing differential control of the furnace roller, relative friction between the furnace roller and the strip steel is generated, and foreign matter on the roller surface is eliminated. By adopting this method, foreign matter on the furnace roller of the continuous annealing furnace can be quickly eliminated, and shutdown and furnace opening can be avoided, saving the loss of funds and production capacity caused by shutdown and furnace opening to treat the furnace roller. Compared with other online grinding roller methods that only adjust CPC deviation correction, the friction force generated by this method and the strip steel is not limited to axial friction, which is more comprehensive and eliminates blind spots. At the same time, it breaks the limitation that only part of the furnace roller can be processed online in the traditional mode. By using a large amount of carbon steel with a carbon content of 0.015% to generate friction with the furnace roller, the grinding roller effect is further optimized. There is no need to modify the equipment to avoid frequent speed increases and decreases that affect the unit capacity. Ensure continuous and stable production of the unit, eliminate foreign matter on the surface of the furnace roller, ensure product surface quality, improve production efficiency, and achieve significant benefits for the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the process of the present invention.

[0024] Figure 2 It is a schematic diagram of the strip movement direction and friction direction after the roller diameter is modified according to the present invention.

[0025] Figure 3 It is a schematic diagram of the movement direction of the strip steel and the direction of the friction force after the CPC is adjusted according to the present invention.

[0026] Among them: 1. Strip steel; 2. Furnace roller. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] like Figure 1-3 As shown, a method for quickly removing foreign matter from a furnace roller comprises the following steps:

[0029] (1) Determine the location of the foreign body based on the situation of the artificial offset CPC correction device.

[0030] According to the situation of manual offset of CPC correction device, the position change of defect on strip 1 is observed to lock the position of foreign matter on annealing furnace roller 2, and use CPC correction device in furnace area to manually offset each section of strip 1. If the defect is offset forward and backward, the position of roller 2 where the defect occurs is determined, indicating that foreign matter exists at this location of roller 2, and this location is processed.

[0031] (2) Selecting strip steel 1 of suitable specifications and high hardness for production.

[0032] The strip steel 1 is a plain carbon steel with a carbon content of 0.015%, a thickness of 1.0-1.5 mm, and a width of 1000-1300 mm. During the production process of the strip steel 1, the temperature of the strip steel 1 is controlled at 600-700°C to prevent the strip steel 1 from buckling due to excessive temperature when processing foreign matter online. During the production process of the strip steel 1, the strip steel 1 is made to run in the furnace area at a speed of 60-100 mpm to prevent it from deviating and maintain stability during production.

[0033] (3) During the production process, the diameter of the furnace roller 2 in the annealing furnace is corrected, and the CPC correction device is fine-tuned to assist in eliminating the surface defects of the strip 1.

[0034] The method for correcting the roller diameter of the furnace roller 2 in the annealing furnace is to adjust the diameter parameter of the furnace roller 2 that contacts the defective surface of the strip 1 in the furnace roller 2 transmission system, with the adjustment base being 5 mm, and setting the roller diameter cycle to 795-800-805-800-795 mm, so that the strip 1 and the furnace roller 2 generate friction along the rolling direction and the reverse rolling direction.

[0035] At the same time, by manually setting the CPC correction device to an offset of -20 to 0 to 20 mm, the strip 1 is assisted to slide slightly along the axial direction of the furnace roller 2, thereby generating axial friction. Through the combined effect of different friction forces in the front, rear, left and right directions, foreign matter on the furnace roller 2 disappears quickly.

[0036] (4) Restore normal production parameters.

[0037] Before restoring normal production parameters, first observe the surface condition of the strip 1. If the surface defects of the strip 1 are eliminated, it means that the foreign matter on the furnace roller 2 has been eliminated, and the diameter of the furnace roller 2 and the CPC correction device are restored to normal production parameters; if the surface defects of the strip 1 are not eliminated, return to step (2).

[0038] The working principle of the present invention is:

[0039] The present invention uses a method with the lowest cost, the best effect and the least impact on the production line capacity to treat foreign matter on the surface of the furnace roller 2. By simulating and adjusting the diameter of the furnace roller 2, changing the linear speed of the furnace roller 2, and then realizing differential control of the furnace roller 2, the furnace roller 2 and the strip steel 1 produce relative friction, and the foreign matter on the roller surface is eliminated. By adopting this method, the foreign matter on the furnace roller 2 of the continuous annealing furnace can be quickly eliminated, and the shutdown of the furnace can be avoided, saving the loss of funds and production capacity caused by the shutdown of the furnace to treat the furnace roller 2. Compared with other online grinding roller methods that only adjust CPC deviation correction, the friction force generated by this method and the strip steel 1 is not limited to the axial friction force, which is more comprehensive and eliminates blind spots. At the same time, it breaks the limitation that only part of the furnace roller 2 can be processed online in the traditional mode. By using a large amount of carbon steel with a carbon content of 0.015% to generate friction with the furnace roller 2, the grinding roller effect is further optimized. There is no need to modify the equipment, and frequent speed increases and decreases can be avoided to affect the unit capacity. Ensure continuous and stable production of the unit, while eliminating foreign matter on the surface of the furnace roller 2, ensure product surface quality, improve production efficiency, and achieve significant benefits for the enterprise.

[0040] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should all fall within the scope of protection of the present invention.

[0041] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A method for quickly removing foreign matter from furnace rollers, characterized in that: The following steps are involved: (1) Determine the location of the foreign body based on the situation of the artificial offset CPC correction device; (2) Select strip steel with appropriate specifications and high hardness for production; (3) During the production process, the diameter of the rollers in the annealing furnace is corrected, and the CPC correction device is fine-tuned to assist in eliminating surface defects of the strip; (4) Restore normal production parameters.

2. The method for quickly eliminating foreign matter from furnace rollers according to claim 1, characterized in that: The method for determining the position of the foreign matter in step (1) is to lock the position of the foreign matter on the annealing furnace roller according to the situation of manually offsetting the CPC correction device, observe the position change of the defect on the strip, and use the CPC correction device in the furnace area to manually offset each section of the strip. If the defect is offset forward and backward, the position of the furnace roller where the defect occurs is determined, indicating that there is a foreign matter at this location of the furnace roller, and treatment is performed at this location.

3. The method for quickly eliminating foreign matter from furnace rollers according to claim 1, characterized in that: The strip steel in step (2) is ordinary carbon steel with a carbon content of 0.015%, a thickness of 1.0-1.5 mm, and a width of 1000-1300 mm.

4. The method for quickly eliminating foreign matter from furnace rollers according to claim 3, characterized in that: During the production process of the strip steel, the temperature of the strip steel is controlled at 600-700° C. to prevent the strip steel from buckling due to excessive temperature when foreign matter is processed online.

5. The method for rapidly removing foreign matter from furnace rollers according to claim 4, characterized in that: During the strip steel production process, the strip steel is made to run in the furnace area at a speed of 60 to 100 mpm to prevent it from running off the track and maintain stability during production.

6. The method for rapidly removing foreign matter from furnace rollers according to claim 5, characterized in that: During the strip steel production process, a speed difference of 0.63% is generated between the furnace rollers and the strip steel.

7. The method for rapidly removing foreign matter from furnace rollers according to claim 6, characterized in that: The method for correcting the roller diameter of the furnace roll in the annealing furnace described in step (3) is to adjust the diameter parameter of the furnace roll in contact with the defective surface of the strip in the furnace roll transmission system, the adjustment base is 5 mm, and the roller diameter cycle is set to 795-800-805-800-795 mm, so that the strip and the furnace roll generate friction along the rolling direction and the reverse rolling direction; At the same time, by manually setting the CPC correction device to an offset of -20 to 0 to 20 mm, the strip is assisted to slide slightly along the axial direction of the furnace roller, thereby generating axial friction. Through the combined effect of different friction forces in the front, back, left and right directions, foreign matter on the furnace roller disappears quickly.

8. The method for rapidly removing foreign matter from furnace rollers according to claim 7, characterized in that: Before restoring normal production parameters as described in step (4), first observe the surface condition of the strip. If the surface defects of the strip are eliminated, it means that the foreign matter on the furnace roller has been eliminated, and the furnace roller diameter and CPC correction device are restored to normal production parameters; if the surface defects of the strip are not eliminated, return to step (2).

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