A method for manufacturing a sleeve

Abstract

This invention discloses a method for manufacturing a sleeve, comprising: selecting scrap steel of a preset size and a preset tensile strength; coiling the scrap steel to obtain a target tail coil; during the process of oriented silicon steel entering the coiler on the decarburizing and annealing production line, controlling the sleeve feeding device on the decarburizing and annealing production line to feed the target tail coil into the coiler mandrel; controlling the coiler to coil the oriented silicon steel to obtain a steel coil; and controlling the target tail coil and the steel coil to enter a ring furnace for high-temperature annealing to obtain a sleeve. This method achieves the reuse of scrap steel by manufacturing a sleeve, which replaces the sleeve required in the production process of oriented silicon steel.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and in particular to a method for manufacturing a sleeve. Background Technology

[0002] To ensure the stability of grain-oriented silicon steel coils during the ring furnace and stretching / leveling processes, a sleeve is required for coiling in the decarburizing annealing unit. However, the use of the sleeve increases the production cost of silicon steel. Therefore, how to maintain the stability of grain-oriented silicon steel coils during the ring furnace and stretching / leveling processes at a lower production cost is an urgent problem to be solved. Summary of the Invention

[0003] This application provides a method for manufacturing a sleeve, which replaces the sleeve required in the production process of grain-oriented silicon steel by using scrap steel as a sleeve, thereby realizing the reuse of scrap steel.

[0004] In a first aspect, the present invention provides the following technical solution through an embodiment of the present invention:

[0005] A method for manufacturing a sleeve includes: selecting scrap steel of a preset size and a preset tensile strength; coiling the scrap steel to obtain a target tail coil; during the process of oriented silicon steel entering the coiler on the decarburizing annealing line, controlling the sleeve feeding device on the decarburizing annealing line to feed the target tail coil into the coiler mandrel; controlling the coiler to coil the oriented silicon steel to obtain a steel coil; and controlling the target tail coil and the steel coil to enter the annular furnace for high-temperature annealing to obtain a sleeve.

[0006] Preferably, after obtaining the sleeve, the process further includes: transporting the sleeve back to the decarburization annealing unit.

[0007] Preferably, the step of coiling the scrap steel includes: coiling the scrap steel using a rewinding unit or a welding unit.

[0008] Preferably, the step of winding the scrap steel using a rewinding unit or a welding unit includes: obtaining the running length of the scrap steel; adjusting the winding speed of the unit based on the running length; and winding the scrap steel based on the adjusted winding speed.

[0009] Preferably, adjusting the winding speed of the unit based on the running length includes: when the running length is equal to the difference between the set length and the length compensation value, reducing the running speed of the unit from a first preset speed to a second preset speed; and controlling the unit to stop when the running length is equal to the set length.

[0010] Preferably, the step of winding the scrap steel using a rewinding unit or a welding unit includes: obtaining the thickness, number of winding turns, and inner diameter of the scrap steel; determining the outer diameter of the steel coil based on the thickness, number of winding turns, and inner diameter of the steel coil; adjusting the winding speed of the unit based on the outer diameter of the steel coil; and winding the scrap steel based on the adjusted winding speed.

[0011] Preferably, adjusting the winding speed of the unit based on the outer diameter of the steel coil includes: reducing the operating speed of the unit to a second preset speed when the outer diameter of the steel coil is equal to the difference between the set outer diameter and the outer diameter compensation value; and controlling the unit to stop when the outer diameter of the steel coil is equal to the set outer diameter.

[0012] Preferably, the step of winding the scrap steel using a rewinding unit or a welding unit includes: obtaining the running length of the scrap steel; adjusting the winding tension value of the unit according to the running length; and winding the scrap steel based on the adjusted winding tension value.

[0013] Preferably, adjusting the winding tension value of the unit according to the running length includes: when the running length is equal to a first length threshold, controlling the winding tension value of the unit to increase from a first winding tension to a second winding tension until the running length is equal to a second length threshold, wherein the first length threshold is less than the second length threshold; when the running length is equal to the second length threshold, controlling the winding tension value of the unit to remain unchanged until the running length is equal to a third length threshold, wherein the second length threshold is less than the third length threshold; and when the running length is equal to the third length threshold, controlling the winding tension value of the unit to increase from the second winding tension to the third winding tension.

[0014] Preferably, after obtaining the target tail roll, the method further includes: using a welding machine to fix the inner and outer rings of the target tail roll.

[0015] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0016] The method for manufacturing a sleeve provided in this invention involves first selecting scrap steel of a preset size and tensile strength, then coiling the selected scrap steel into a target tail coil (i.e., a small coil). Next, the target tail coil is fed into the mandrel of a decarburizing annealing unit via a sleeve feeding device. After the target tail coil enters the mandrel, the coiler is controlled to normally coil the grain-oriented silicon steel that has entered the coiler, obtaining a steel coil. Then, the target tail coil, along with the steel coil, is fed into an annular furnace for high-temperature annealing, allowing the target tail coil to form a sleeve after high-temperature sintering. This method utilizes the high-temperature characteristics of the annular furnace during the production of grain-oriented silicon steel to sinter the coiled small coil into a single unit, forming a sleeve. Thus, by adding only a few simple production steps, scrap steel can be used to manufacture sleeves, which can then replace the sleeves required in the production of grain-oriented silicon steel, achieving the reuse of scrap steel. This method effectively ensures the stability of grain-oriented silicon steel coils during the ring furnace and stretching and leveling processes by reducing production costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A flowchart illustrating a method for manufacturing a sleeve according to an embodiment of the present invention;

[0019] Figure 2 A graph showing the relationship between winding length and winding tension provided for an embodiment of the present invention;

[0020] Figure 3 A flowchart illustrating an exemplary sleeve manufacturing method provided in an embodiment of the present invention. Detailed Implementation

[0021] The applicant discovered that ordinary strip steel (adjustment material) is used in each process of cold rolling production during the debugging and process recovery. The strip steel is scrapped after being reused multiple times. However, by processing the scrapped strip steel, it can be formed into the sleeve required in the production process of oriented silicon steel.

[0022] In view of this, the present application provides a method for manufacturing a sleeve, which replaces the sleeve required in the production process of grain-oriented silicon steel by manufacturing a sleeve from scrap steel, thereby realizing the reuse of scrap steel.

[0023] The overall technical solution of this application embodiment is as follows:

[0024] A method for manufacturing a sleeve includes: selecting scrap steel of a preset size and a preset tensile strength; coiling the scrap steel to obtain a target tail coil; during the process of oriented silicon steel entering the coiler on the decarburizing annealing line, controlling the sleeve feeding device on the decarburizing annealing line to feed the target tail coil into the coiler mandrel; controlling the coiler to coil the oriented silicon steel to obtain a steel coil; and controlling the target tail coil and the steel coil to enter the annular furnace for high-temperature annealing to obtain a sleeve.

[0025] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0026] Firstly, the embodiments of the present invention provide a method for manufacturing a sleeve, specifically, as follows: Figure 1 As shown, the method includes the following steps S101 to S105.

[0027] Step S101: Select scrap steel with preset size and preset tensile strength.

[0028] It is understood that the scrap steel in this application may be scrapped strip steel generated from various processes of cold rolling production.

[0029] In the specific implementation process, scrap steel strips are selected, with non-oriented silicon steel being the preferred material. Specifically, the preset dimensions may include the strip thickness and strip width. The strip width can be determined based on the width of the decarburized annealed steel coils, ensuring that the width of the selected scrap steel is similar to that of the decarburized annealed steel coils. In one embodiment, scrap steel with a thickness between 0.5 mm and 0.6 mm and a width between 1020 mm and 1060 mm is selected.

[0030] In practice, the tensile strength of the selected scrap steel can be determined based on the weight and volume ratio of the steel coils wound by the decarburizing annealing unit. Preferably, the preset tensile strength is not less than 700 MPa.

[0031] Step S102: The scrap steel is coiled to obtain the target tail coil.

[0032] Specifically, scrap steel can be coiled using a rewinding unit or a welding unit to obtain the target tail coil.

[0033] In the specific implementation process, the scrap steel is wound up using a rewinding unit or a welding unit, which may include: obtaining the running length of the scrap steel; adjusting the winding speed of the unit based on the running length; and winding the scrap steel based on the adjusted winding speed. This winding is a fixed-length winding mode.

[0034] Specifically, the winding speed of the unit is adjusted based on the running length. This may include: when the running length is equal to the difference between the set length and the length compensation value, reducing the running speed of the unit from a first preset speed to a second preset speed; and controlling the unit to stop when the running length is equal to the set length.

[0035] It should be noted that the set length can be determined based on the strip thickness and the elevation of the decarburizing annealing unit's sleeve feeding device. In one embodiment, the set length is between 50m and 60m, and the length compensation value can be between 4m and 6m.

[0036] In one implementation, during the scrap steel coiling process, the running length of the scrap steel is recorded by an encoder on the front steering pinch roller of the coiler. When the running length of the scrap steel, i.e., the coiling length value, equals a set value minus 5m, the operating speed of the unit is reduced from a first preset speed to a second preset speed. When the coiling length value equals the set value, the unit is stopped. This control method avoids the difficulty of manually controlling the coiling length when the steel coiling speed is high, which often results in coiling lengths that are too long or too short, thus failing to achieve the desired results.

[0037] Optionally, the second preset speed can be between 25mpm and 30mpm.

[0038] Of course, as another optional embodiment, adjusting the winding speed of the unit based on the running length may further include: when the running length is equal to the difference between the set length and the first length compensation value, reducing the running speed of the unit from a first preset speed to a second preset speed; when the running length is equal to the difference between the set length and the second length compensation value, reducing the running speed of the unit from the second preset speed to a third preset speed; and controlling the unit to stop when the running length is equal to the set length. The first length compensation value can be between 5m and 6m, and the second length compensation value can be between 2m and 3m.

[0039] Furthermore, considering that the thickness of the scrap steel used to make the sleeve is not fixed, in order to avoid the impact of the scrap steel thickness change on the winding accuracy, when the scrap steel thickness changes, the winding length of the scrap steel needs to be re-determined. Only after the winding length of the scrap steel is determined can the unit be adjusted to the fixed-length winding mode.

[0040] In the specific implementation process, the scrap steel is wound using a rewinding unit or a welding unit, which may also include: obtaining the thickness of the scrap steel, the number of winding turns, and the inner diameter of the winding; determining the outer diameter of the steel coil based on the thickness of the scrap steel, the number of winding turns, and the inner diameter of the winding; adjusting the winding speed of the unit based on the outer diameter of the steel coil; and winding the scrap steel based on the adjusted winding speed. This winding is a sizing winding mode.

[0041] In one implementation, during the scrap steel winding process, the number of winding turns and the inner diameter of the winding can be recorded by the encoder of the winding machine, while the strip thickness is known. Specifically, the outer diameter of the steel coil is determined based on the scrap steel thickness, the number of winding turns, and the inner diameter of the winding. This can be achieved by using the formula: outer diameter of steel coil = 2 × winding thickness × number of winding turns + inner diameter of winding.

[0042] Of course, as another optional embodiment, coiling scrap steel using a rewinding unit or a welding unit may further include: obtaining the thickness of the scrap steel, the initial length of the scrap steel, and the inner diameter of the coil; and determining the outer diameter of the steel coil based on the thickness of the scrap steel, the initial length of the scrap steel, and the inner diameter of the coil. Here, the initial length of the scrap steel is the set length mentioned above.

[0043] Specifically, the winding speed of the unit is adjusted based on the outer diameter of the steel coil. This may include: reducing the operating speed of the unit to a second preset speed when the outer diameter of the steel coil is equal to the difference between the set outer diameter and the outer diameter compensation value; and controlling the unit to stop when the outer diameter of the steel coil is equal to the set outer diameter.

[0044] It should be noted that the outer diameter can be controlled according to the size of the sleeve feeding device at the outlet of the decarburizing annealing unit. In one embodiment, the outer diameter is set between 520mm and 550mm, and the outer diameter compensation value can be between 2mm and 3mm.

[0045] In one implementation, during the scrap steel coiling process, when the outer diameter of the coiled scrap steel is equal to the set outer diameter of 538mm - 3mm, the operating speed of the unit is reduced to 30mpm. When the outer diameter of the coil is 538mm, the unit is stopped. This control method can fix the outer diameter of the target tail coil and also control the stability of the scrap steel coiling process.

[0046] Of course, as another alternative embodiment, adjusting the winding speed of the unit based on the outer diameter of the steel coil may include: controlling the unit to stop when the outer diameter of the steel coil is equal to the set outer diameter.

[0047] In practice, users can adjust the unit according to site requirements by using either a fixed-length winding mode or a fixed-diameter winding mode to achieve the winding of scrap steel. The two control modes can be switched arbitrarily.

[0048] It is understandable that constant tension winding has certain drawbacks, which are not conducive to the adjustment of tension during the winding process of steel coils. Therefore, this application provides a tapered winding mode.

[0049] In a specific embodiment, the process of winding scrap steel using a rewinding unit or a welding unit may further include: obtaining the running length of the scrap steel; adjusting the winding tension value of the unit based on the running length; and winding the scrap steel based on the adjusted winding tension value.

[0050] Specifically, adjusting the winding tension value of the unit according to the running length can include: when the running length is equal to a first length threshold, controlling the winding tension value of the unit to increase from the first winding tension to the second winding tension, until the running length is equal to the second length threshold, wherein the first length threshold is less than the second length threshold; when the running length is equal to the second length threshold, controlling the winding tension value of the unit to remain unchanged, until the running length is equal to a third length threshold, wherein the second length threshold is less than the third length threshold; when the running length is equal to the third length threshold, controlling the winding tension value of the unit to increase from the second winding tension to the third winding tension.

[0051] Optionally, the first length threshold can be between 10m and 20m, the second length threshold can be between 20m and 30m, and the third length threshold can be between 30m and 40m. The first winding tension can be 30KN, the second winding tension can be 35KN, and the third winding tension can be 40KN. Figure 2 As shown in the figure, the winding tension curve provided in this application represents the winding length on the horizontal axis and the winding tension on the vertical axis.

[0052] In one embodiment, during the winding process of the scrap steel, the running length of the scrap steel is obtained. When the winding length of the scrap steel is 10m, the winding tension value of the control unit is increased from 30KN to 35KN, until the winding length is 20m. Optionally, the tension value is increased by 1KN for every 2m of winding length.

[0053] When the winding length is 20m, the winding tension of the control unit remains stable at 35KN until the winding length reaches 30m. When the winding length is 30m, the winding tension of the control unit increases from 35KN to 40KN until the winding length reaches 40m.

[0054] In a specific embodiment, the tension can be continuously increased or decreased through interface parameter settings, which facilitates the adjustment of the strip coil tightness. Compared to the constant tension coiling method, the control method of first increasing, then keeping the tension constant, and then increasing again can avoid excessive tension in the inner coil causing coil collapse, and also prevent the outer coil from being loosely coiled for a tighter coil, effectively controlling the coil tower shape.

[0055] In a specific embodiment, after obtaining the target tail roll, the method further includes: using a welding machine to fix the inner and outer rings of the target tail roll.

[0056] Specifically, such as Figure 3As shown, fixing the inner and outer rings of the target tail coil using a welding machine can include: securing the tail of the target tail coil with a strong magnet, unloading the target tail coil using an unloading trolley, hoisting the target tail coil onto a tail coil transport device using an overhead crane, fixing the inner and outer rings of the target tail coil with a welding machine, and then removing the strong magnet. Optionally, argon arc welding can be used to spot weld the inner and outer rings of the target tail coil. Electric welding with a welding machine can effectively prevent the target tail coil from loosening and deforming.

[0057] The target tail coil, after being fixed by a welding machine, is transported to the decarburizing annealing unit. Furthermore, to prevent collisions with the coiler mandrel during sleeve feeding and to ensure the sleeve is fed to the accurate position, avoiding speed reduction or shutdown in the process section, before the sleeve feeding device on the decarburizing annealing line feeds the target tail coil into the coiler mandrel, the following may be included: using a sleeve inner diameter detection device to detect the inner diameter of the target tail coil, ensuring that the inner diameter of the target tail coil meets the usage standards, so as to ensure that the target tail coil and mandrel are tightly bonded when the coiler expands to its mechanical limit position after the target tail coil is fed into the coiler mandrel.

[0058] Step S103: During the process of the oriented silicon steel entering the coiler on the decarburizing annealing line, the sleeve feeding device on the decarburizing annealing line is controlled to feed the target tail coil into the coiler mandrel.

[0059] Step S104: Control the coiler to coil the oriented silicon steel to obtain a steel coil;

[0060] Step S105: Control the target tail coil and the steel coil to enter the ring furnace for high-temperature annealing to obtain the sleeve.

[0061] In a specific embodiment, during the normal production process of the strip steel, after the oriented silicon steel on the decarburizing annealing line undergoes decarburizing annealing, it enters the coiling machine. The target tail coil is fed into the coiling machine mandrel by controlling the sleeve feeding device, and then the winding of the oriented silicon steel begins to obtain a steel coil (i.e., a decarburized annealed coil). That is, after the target tail coil is fed into the coiling machine mandrel, the winding of the head of the decarburized annealed strip begins. The target tail coil fed into the coiling machine mandrel can be used normally as a sleeve.

[0062] Then, the target tail coil is controlled to enter the ring furnace for high-temperature annealing along with the decarburized annealed coil. After high-temperature sintering, the target tail coil forms a sleeve, and after high-temperature sintering, the decarburized annealed coil forms a silicon steel coil.

[0063] In a specific embodiment, after obtaining the sleeve, the process further includes: transporting the sleeve back to the decarburizing annealing unit. Specifically, after the silicon steel coil is uncoiled in the stretching and leveling unit, the sleeve can be transported to the decarburizing annealing unit for reuse.

[0064] like Figure 3The diagram shows a flowchart of an exemplary sleeve manufacturing method provided in this application. First, scrap steel is fed to the recoiling unit or welding unit uncoiler. The recoiling unit or welding unit coils the scrap steel to a set length and then cuts it into tail coils. The tail of the tail coil is then fixed with a strong magnet. The uncoiling trolley completes the uncoiling operation. An overhead crane is used to lift the tail coil to the tail coil transport device. The tail coil is spot welded using argon arc welding. The strong magnet is removed. Then, a forklift is used to transport the tail coil to the decarburizing annealing unit. The tail coil is measured to see if it meets the usage standards (i.e., whether the inner diameter is qualified). The tail coil is fed into the coiler mandrel using a sleeve feeding device to start the winding of the oriented silicon steel. The tail coil is controlled to enter the ring furnace with the oriented silicon steel to obtain the sleeve. During the production of the stretching and leveling unit, the oriented silicon steel coil is consumed, leaving the sleeve formed by the tail coil.

[0065] This application utilizes scrap steel strips to process target coils, and simultaneously processes these coils into sleeves during the production of grain-oriented silicon steel in a ring furnace. These sleeves can then be repeatedly recycled. This method fully utilizes scrap steel and enables the formation of sleeve products through the high-temperature annealing process of grain-oriented silicon steel, allowing for repeated use by the decarburization annealing unit and reducing production costs.

[0066] In summary, the sleeve manufacturing method provided by this invention enables the production of sleeves from scrap steel, which can then replace the sleeves required in the production process of grain-oriented silicon steel, thus achieving the reuse of scrap steel. This method effectively ensures the stability of grain-oriented silicon steel coils during the ring furnace and stretching / leveling processes at a lower production cost.

[0067] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0068] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for manufacturing a sleeve, characterized in that, include: Select scrap steel with preset dimensions and preset tensile strength; The scrap steel is coiled to obtain the target tail coil; During the process of oriented silicon steel entering the coiler on the decarburizing annealing line, the sleeve feeding device on the decarburizing annealing line is controlled to feed the target tail coil into the coiler mandrel. The coiler is controlled to coil the oriented silicon steel to obtain a steel coil; The target tail coil is controlled to enter the ring furnace along with the steel coil for high-temperature annealing, and the coiled target tail coil is sintered into a whole to obtain a sleeve. The coiling of the scrap steel includes: The scrap steel is coiled up using a rewinding unit or a welding unit.

2. The manufacturing method as described in claim 1, characterized in that, After obtaining the sleeve, the process further includes: transporting the sleeve back to the decarburization annealing unit.

3. The manufacturing method as described in claim 1, characterized in that, The process of coiling the scrap steel using a rewinding unit or a welding unit includes: Obtain the running length of the scrap steel; Based on the aforementioned running length, the winding speed of the unit is adjusted; The scrap steel is wound up based on the adjusted winding speed.

4. The manufacturing method as described in claim 3, characterized in that, The adjustment of the winding speed of the unit based on the running length includes: When the running length is equal to the difference between the set length and the length compensation value, the running speed of the unit is reduced from the first preset speed to the second preset speed; When the running length equals the set length, the unit is controlled to stop.

5. The manufacturing method as described in claim 1, characterized in that, The process of coiling the scrap steel using a rewinding unit or a welding unit includes: Obtain the thickness, number of coils, and inner diameter of the scrap steel; The outer diameter of the steel coil is determined based on the thickness of the scrap steel, the number of coils, and the inner diameter of the coil. Based on the outer diameter of the steel coil, the winding speed of the unit is adjusted; The scrap steel is wound up based on the adjusted winding speed.

6. The manufacturing method as described in claim 5, characterized in that, The adjustment of the winding speed of the unit based on the outer diameter of the steel coil includes: When the outer diameter of the steel coil is equal to the difference between the set outer diameter and the outer diameter compensation value, the operating speed of the unit is reduced to the second preset speed; When the outer diameter of the steel coil is equal to the set outer diameter, the unit is controlled to stop.

7. The manufacturing method as described in claim 1, characterized in that, The process of coiling the scrap steel using a rewinding unit or a welding unit includes: Obtain the running length of the scrap steel; The winding tension value of the unit is adjusted according to the running length. The scrap steel is wound up based on the adjusted winding tension value.

8. The manufacturing method as described in claim 7, characterized in that, The adjustment of the winding tension value of the unit based on the running length includes: When the running length is equal to the first length threshold, the winding tension value of the unit is controlled to increase from the first winding tension to the second winding tension until the running length is equal to the second length threshold, wherein the first length threshold is less than the second length threshold; When the running length is equal to the second length threshold, the winding tension value of the unit is kept constant until the running length is equal to the third length threshold, wherein the second length threshold is less than the third length threshold; When the running length is equal to the third length threshold, the winding tension value of the unit is controlled to increase from the second winding tension to the third winding tension.

9. The manufacturing method as described in claim 1, characterized in that, After obtaining the target end volume, the process also includes: The inner and outer rings of the target tail roll are fixed using a welding machine.

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