Method for reducing rubber press-in defect of medium and high grade silicon steel

Abstract

The embodiment of the present application provides a method for reducing rubber pressing defects of medium and high grade silicon steel, and relates to the technical field of silicon steel production process. The method for reducing rubber pressing defects of medium and high grade silicon steel comprises the following steps: reducing the elongation range of a tension leveller; reducing the insertion depth value range of a straightening roll of the tension leveller; and reducing the insertion depth value range of two bending rolls of the tension leveller. The elongation range of the tension leveller is mainly used for straightening the silicon steel. Since the silicon steel is pickled before being straightened, the surface roughness of the silicon steel after pickling is increased. Reducing the insertion depth value range of the straightening roll and the two bending rolls of the tension leveller can reduce the pressing amount of the straightening roll and the bending roll on the surface of the silicon steel plate, reduce the friction between the silicon steel plate and the tension leveller, avoid the rubber on the surface of the work roll from adhering to the surface of the silicon steel plate, eliminate the accumulation of rubber powder, effectively avoid defects on the surface of the silicon steel, and improve the surface quality of the silicon steel.

Description

Technical Field

[0001] This invention relates to the field of silicon steel production technology, and more specifically, to a method for reducing the indentation defects of rubber sheets in medium and high grade silicon steel. Background Technology

[0002] To improve the surface quality of silicon steel, the current production process for medium and high grade silicon steel has changed from a single pickling to a two-stage pickling process. During the pickling and rolling process of the modified silicon steel, black rubbery residue was found on the surface of the strip after pickling. The number of strips with this residue varied, and its location was random and intermittent. Strips with this residue severely affect the surface quality in subsequent production and will form white spots after annealing, failing to meet the surface quality requirements for coil delivery. Therefore, when these problems occur, a shutdown inspection is generally performed. During the inspection, adhesive was found on the surface of the work rolls of the tension leveler, and also at the weld seams of the strip. To reduce the probability of defects in the production process of medium and high grade silicon steel, methods such as cleaning the work rolls of the tension leveler or opening the tension leveler when passing weld seams are generally adopted to avoid these defects.

[0003] Existing methods for avoiding defects in silicon steel have limitations, including the inability to effectively remove surface defects in medium and high grade silicon steel, the inability to improve the surface quality of silicon steel, and poor production efficiency. Summary of the Invention

[0004] This invention provides a method for reducing the indentation defects of rubber sheets in medium and high grade silicon steel, which can effectively avoid defects on the surface of silicon steel, effectively improve the surface quality of silicon steel, and improve production efficiency.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] Embodiments of the present invention provide a method for reducing indentation defects in medium- and high-grade silicon steel rubber sheets, comprising:

[0007] Reduce the elongation range of the tension leveler;

[0008] Reduce the range of insertion depth values ​​for the straightening rollers of the tension leveler;

[0009] Reduce the range of insertion depth values ​​for the two bending rollers of the tension leveler.

[0010] Optionally, the step of reducing the elongation range of the tension leveler includes:

[0011] Reduce the elongation range of the tension leveler to 0.5%-0.99%.

[0012] Optionally, the step of reducing the insertion depth range of the straightening rollers of the tension leveler includes:

[0013] Reduce the insertion depth of the straightening roller to 4mm-8mm.

[0014] Optionally, the step of reducing the insertion depth range of the two bending rollers of the tension leveler includes:

[0015] The insertion depth of the two bending rollers of the tension leveler is reduced to 8mm-15mm and 6mm-12mm respectively.

[0016] Optionally, the method for reducing indentation defects in medium- and high-grade silicon steel rubber sheets further includes:

[0017] Reduce the tension value range of the front tension roller of the tension leveler.

[0018] Optionally, the step of reducing the tension value range of the front tension roller of the tension leveler includes:

[0019] Reduce the tension value of the front tension roller of the tension leveler to 120KN-140KN.

[0020] Optionally, the method for reducing indentation defects in medium- and high-grade silicon steel rubber sheets further includes:

[0021] Reduce the power of the welding machine's back heating, thereby reducing the back heating temperature of the welding machine.

[0022] Optionally, the step of reducing the post-weld heating power, thereby reducing the post-weld heating temperature, includes:

[0023] The reduced heating power range of the welding machine is 15KW-25KW.

[0024] Optionally, the method for reducing indentation defects in medium- and high-grade silicon steel rubber sheets further includes:

[0025] Regularly inspect and replace the squeeze rollers.

[0026] Optionally, the method for reducing indentation defects in medium- and high-grade silicon steel rubber sheets further includes:

[0027] Regularly inspect and replace the tension rollers.

[0028] The beneficial effects of the method for reducing indentation defects in medium- and high-grade silicon steel rubber sheets according to embodiments of the present invention include, for example:

[0029] The method for reducing rubber indentation defects in medium and high grade silicon steel includes reducing the elongation range of the tension leveler; reducing the insertion depth range of the straightening rollers of the tension leveler; and reducing the insertion depth range of the two bending rollers of the tension leveler. When using this method, reducing the elongation range of the tension leveler allows it to primarily straighten the silicon steel. Since the silicon steel undergoes pickling before straightening, the surface roughness increases. Reducing the insertion depth range of the straightening rollers and the two bending rollers reduces the downward pressure of the straightening and bending rollers on the silicon steel sheet, thereby reducing the friction between the silicon steel sheet and the tension leveler. This prevents the rubber from adhering to the silicon steel sheet surface on the work rollers, eliminating rubber powder accumulation, effectively preventing surface defects in the silicon steel, improving the surface quality of the silicon steel, improving the sheet shape, and increasing production efficiency. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This embodiment provides a flowchart of a method for reducing indentation defects in medium- and high-grade silicon steel rubber sheets. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0036] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0037] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0038] To improve the surface quality of silicon steel, the current production process for medium and high grade silicon steel has changed from a single pickling to a two-stage pickling process. During the pickling and rolling process of the modified silicon steel, black rubbery residue was found on the surface of the strip after pickling. The number of strips with this residue varied, and its location was random and intermittent. Strips with this residue severely affect the surface quality in subsequent production and will form white spots after annealing, failing to meet the surface quality requirements for coil delivery. Therefore, when these problems occur, a shutdown inspection is generally performed. During the inspection, adhesive was found on the surface of the work rolls of the tension leveler, and also at the weld seams of the strip. To reduce the probability of defects in the production process of medium and high grade silicon steel, methods such as cleaning the work rolls of the tension leveler or opening the tension leveler when passing weld seams are generally adopted to avoid these defects.

[0039] Existing methods for avoiding defects in silicon steel have limitations, including the inability to effectively remove surface defects in medium and high grade silicon steel, the inability to improve the surface quality of silicon steel, and poor production efficiency.

[0040] Please refer to Figure 1 This embodiment provides a method for reducing the indentation defects of rubber sheets in medium and high grade silicon steel. It can effectively improve the technical problems mentioned above, effectively avoid defects on the surface of silicon steel, effectively improve the surface quality of silicon steel, and improve production efficiency.

[0041] It should be noted that the method for reducing the indentation defect of rubber sealant in medium- and high-grade silicon steel in this embodiment is applicable to medium- and high-grade silicon steel. In other embodiments, this method for reducing the indentation defect of rubber sealant in medium- and high-grade silicon steel can also be applied to low-grade silicon steel. No specific limitations are made here.

[0042] Please refer to Figure 1 The methods for reducing the indentation defects of medium and high grade silicon steel rubber sheets include:

[0043] S1: Reduce the elongation range of the tension leveler;

[0044] Specifically, reduce the elongation range of the tension leveler to 0.5%-0.99%.

[0045] In this embodiment, the elongation of the tension leveler can be 0.5% or 1.6%. In other embodiments, the elongation of the tension leveler can be 0.7% or 0.99%, and no specific limitation is made here.

[0046] It should be noted that when the elongation of the tension leveler is greater than 1%, the tension leveler can not only straighten silicon steel, but also mechanically descaling to remove iron oxide scale, thereby controlling and improving the mechanical properties of the strip. When the elongation of the tension leveler is less than 1%, its main function is to straighten the strip. Since the silicon steel in this embodiment is a medium-to-high grade silicon steel, it has already undergone normalizing pickling before straightening, and its surface iron oxide scale has been removed. In this case, the tension leveler only needs to straighten it, and its main purpose is to improve the shape of the silicon steel. Therefore, the elongation of the tension leveler can be less than 1%.

[0047] In this embodiment, the strip straightener includes one straightening unit and two bending units, which are arranged sequentially. The first two bending units control the elongation, and the last straightening unit controls the straightening of the strip. Specifically, the straightening unit is a straightening roller, and the bending unit is a bending roller.

[0048] The insertion depth of the straightening roller and bending roller is the amount of downward pressure exerted by them. By adjusting the insertion depth of the straightening roller and bending roller, the tension before and after the tension leveler can be changed, thereby automatically controlling the elongation.

[0049] S2: Reduce the range of insertion depth values ​​for the straightening rollers of the tension leveler;

[0050] Specifically, the insertion depth of the straightening roller is reduced to 4mm-8mm.

[0051] In this embodiment, the insertion depth of the straightening roller can be 4 mm or 5 mm. In other embodiments, the insertion depth of the straightening roller can be 7 mm or 8 mm, and no specific limitation is made here.

[0052] S3: Reduce the range of insertion depth values ​​for the two bending rollers of the tension leveler;

[0053] Specifically, the insertion depth of the two bending rollers of the tension leveler is reduced to 8mm-15mm and 6mm-12mm, respectively.

[0054] Two bending rollers and one straightening roller are arranged alternately. The two bending rollers are the first bending roller and the second bending roller. The insertion depth of the first bending roller is in the range of 8mm-15mm, and the insertion depth of the second bending roller is in the range of 6mm-12mm.

[0055] In this embodiment, the insertion depth of the first bending roller is 8 mm. In other embodiments, the insertion depth of the first bending roller can be 12 mm or 15 mm, and no specific limitation is made here.

[0056] In this embodiment, the insertion depth of the second bending roller is 6 mm. In other embodiments, the insertion depth of the second bending roller can be 10 mm or 12 mm, and no specific limitation is made here.

[0057] S4: Reduce the tension value range of the front tension roller of the tension leveler;

[0058] Specifically, the tension value of the front tension roller of the tension leveler is reduced to 120KN-140KN.

[0059] In this embodiment, the tension value of the front tension roller of the tension leveler is 120KN or 124KN. In other embodiments, the tension value of the front tension roller of the tension leveler can be 130KN or 140KN, and no specific limitation is made here.

[0060] It should be noted that reducing the insertion depth of the straightening roller and bending roller will reduce the elongation of the tension leveler and the tension value of the front tension roller of the tension leveler. By reducing the elongation and the insertion depth of the straightening roller and bending roller, the friction between the front tension roller of the tension leveler and the silicon steel plate can be reduced, thereby reducing the probability of adhesive powder adhering to the silicon steel plate.

[0061] Furthermore, while reducing the friction between the tension roller and the silicon steel plate surface in the tension leveler, it is also necessary to ensure that the tension leveler has a certain straightening function for the silicon steel. Therefore, the elongation range of the tension leveler in this embodiment is set to 0.5%-0.99%, and the surface roughness of the working roller of the tension leveler is controlled to be below 0.5μm.

[0062] In this embodiment, the surface roughness of silicon steel without normalizing and pickling ranges from 0.5μm to 2μm. The surface roughness of silicon steel after normalizing and pickling increases, ranging from 3μm to 5μm. Higher friction between the silicon steel surface and the tension leveler makes it easier for rubber to adhere to the silicon steel surface and accumulate on the tension leveler's rollers. Therefore, reducing the friction between the silicon steel surface and the tension leveler reduces the probability of rubber adhering to the silicon steel surface, thus eliminating rubber accumulation on the tension leveler's rollers. This prevents defects in the silicon steel during production and improves its surface quality.

[0063] S5: Reduce the power of the welding machine's back heating, thereby reducing the temperature of the welding machine's back heating.

[0064] Specifically, the reduced heating power of the welding machine ranges from 15KW to 25KW.

[0065] Reducing the heating power of the welding machine can prevent the roller surface from being scalded by excessively high weld temperatures, thus avoiding the possibility of the rubber belt being pulled into the leveling machine. Of course, while avoiding excessively high weld temperatures, it is also necessary to ensure that the weld elongation requirements are met to ensure the stability of the weld as it passes through the rolling mill.

[0066] S6: Regularly inspect and replace the squeeze rollers;

[0067] S7: Regularly inspect and replace the tension roller.

[0068] Understandably, regularly replacing the rubber rollers and tension rollers eliminates the probability of rubber adhering to the roller surface, further reducing the likelihood of rubber adhering to the silicon steel surface during straightening, thereby eliminating rubber buildup on the roller surface of the tension leveler. This prevents defects in the silicon steel during production, thus improving the surface quality of the silicon steel.

[0069] Furthermore, the tension rollers of the tension leveler can be replaced with high-temperature resistant and wear-resistant tension rollers to avoid defects in silicon steel during the production process.

[0070] The method for reducing indentation defects in medium- and high-grade silicon steel rubber sheets provided in this embodiment has at least the following advantages:

[0071] The method to reduce the indentation defects of rubber sheeting in medium and high grade silicon steel is to reduce the insertion depth of the straightening roller and bending roller, thereby reducing the elongation of the tension leveler and the tension value of the front tension roller of the tension leveler. By reducing the elongation and the insertion depth of the straightening roller and bending roller, the friction between the front tension roller of the tension leveler and the silicon steel plate surface can be reduced, thereby reducing the probability of rubber powder adhering to the silicon steel plate surface.

[0072] Specifically, the surface roughness of unprocessed silicon steel ranges from 0.5μm to 2μm, while that of silicon steel after normalizing and pickling increases to 3μm-5μm. The higher the friction between the silicon steel surface and the tension leveler, the easier it is for rubber to adhere to the surface and accumulate on the rollers of the tension leveler. Therefore, reducing the friction between the silicon steel surface and the tension leveler reduces the probability of rubber adhering to the surface, thus eliminating rubber accumulation on the rollers. This prevents defects in the silicon steel during production and improves its surface quality.

[0073] The method for reducing the indentation defects of rubber sealant in medium and high grade silicon steel is used to adjust and optimize the heating temperature of the welding machine by adjusting the equipment parameters between processes and periodically managing the equipment. This eliminates the situation of adhesive sticking to the weld, reduces the insertion depth between the silicon steel and the straightening machine, removes the accumulation of adhesive powder, and eliminates the adhesion of rubber sealant to the surface of the silicon steel plate, which leads to defects in the silicon steel, thus effectively improving the surface quality of medium and high grade silicon steel.

[0074] In summary, this invention provides a method for reducing the indentation defect of rubber sheeting in medium- and high-grade silicon steel. This method includes reducing the elongation range of the tension leveler; reducing the insertion depth range of the straightening rollers of the tension leveler; and reducing the insertion depth range of the two bending rollers of the tension leveler. When used, reducing the elongation range of the tension leveler allows it to primarily straighten the silicon steel. Since the silicon steel undergoes pickling before straightening, the surface roughness increases. Reducing the insertion depth range of the straightening rollers and the two bending rollers reduces the downward pressure exerted by these rollers on the silicon steel surface, thereby reducing the friction between the silicon steel surface and the tension leveler. This prevents the rubber sheeting from adhering to the silicon steel surface, eliminating rubber powder accumulation, effectively preventing surface defects, improving the surface quality of the silicon steel, improving the sheet shape, and increasing production efficiency.

[0075] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method of reducing rubber press-in defects in medium-high grade silicon steel, characterized by, include: Reduce the elongation range of the tension leveler to 0.5%-0.99%; Reduce the insertion depth of the straightening rollers of the tension leveler to 4mm-8mm; The insertion depth of the two bending rollers of the tension leveler is reduced to 8mm-15mm and 6mm-12mm respectively.

2. The method of reducing rubber press-in defects in medium to high grade silicon steel of claim 1, wherein, The method for reducing the indentation defects of medium and high grade silicon steel rubber sheets also includes: Reduce the tension value range of the front tension roller of the tension leveler.

3. The method of reducing rubber press-in defects in medium to high grade silicon steel of claim 2, wherein, The step of reducing the tension value range of the front tension roller of the tension leveler includes: Reduce the tension value of the front tension roller of the tension leveler to 120KN-140KN.

4. The method of reducing rubber press-in defects in medium to high grade silicon steel of claim 1, wherein, The method for reducing the indentation defects of medium and high grade silicon steel rubber sheets also includes: Reduce the power of the welding machine's back heating, thereby reducing the back heating temperature of the welding machine.

5. The method of reducing rubber press-in defects in medium to high grade silicon steel of claim 4, wherein, The step of reducing the post-heating power of the welding machine, thereby reducing the post-heating temperature of the welding machine, includes: The reduced heating power range of the welding machine is 15KW-25KW.

6. The method of reducing rubber press-in defects in medium to high grade silicon steel of any one of claims 1-5, wherein, The method for reducing the indentation defects of medium and high grade silicon steel rubber sheets also includes: Regularly inspect and replace the squeeze rollers.

7. The method of reducing rubber press-in defects in medium to high grade silicon steel of any one of claims 1-5, wherein, The method for reducing the indentation defects of medium and high grade silicon steel rubber sheets also includes: Regularly inspect and replace the tension rollers.

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