Design Method for Bright Vertical Annealing Process of Ultra-thin Wide Stainless Steel

Abstract

This invention discloses a design method for a bright vertical annealing process for ultra-thin wide-band stainless steel. For stainless steel strips with a thickness of 0.05mm-1mm and a width of 600mm-1200mm, a vertical bright annealing unit is used for vertical bright annealing. The TV value and process speed of the unit are determined based on the unit's annual output, production specifications, and annual production time. The inlet and outlet speeds for different specifications of stainless steel strips are determined based on the process speed, inlet section downtime, outlet section downtime, and the length of the stainless steel strip. The effective looper quantity for the inlet looper is determined based on the inlet section downtime, and the effective looper quantity for the outlet looper is determined based on the outlet section downtime. The roller diameter and spacing between the rollers are determined based on the thickness specifications of the stainless steel strip. This method provides a complete design process reference for the bright vertical annealing process of ultra-thin wide-band stainless steel, filling a gap in current ultra-thin wide-band stainless steel bright vertical annealing technology.

Description

Technical Field

[0001] This invention belongs to the field of stainless steel sheet and strip production, and specifically relates to a design method for a bright vertical annealing process of ultra-thin wide stainless steel. Background Technology

[0002] When bright annealing stainless steel cold strip, there are two annealing methods: horizontal annealing and vertical annealing. Among them, the surface quality of the lower surface is slightly worse than that of the upper surface in horizontal bright annealing, while the surface quality of the product is better in vertical bright annealing.

[0003] For ultra-thin bright strip steel, the vast majority of domestic production is currently carried out on horizontal bright annealing units, with only a few on vertical bright annealing units. Even when produced on vertical bright annealing units, the width of the strip steel produced is relatively small, and the units all use imported equipment. Since the wider the ultra-thin strip steel, the more prone it is to wrinkling, there is an urgent need to provide a process design method for bright vertical annealing of ultra-thin wide stainless steel. Summary of the Invention

[0004] The purpose of this invention is to provide a design method for a bright vertical annealing process of ultra-thin wide-band stainless steel. This method provides a complete design process reference for the bright vertical annealing process of ultra-thin wide-band stainless steel, filling the current gap in the bright vertical annealing process of ultra-thin wide-band stainless steel.

[0005] The technical solution adopted in this invention is:

[0006] A method for designing a vertical bright annealing process for ultra-thin wide-band stainless steel strips is disclosed. For stainless steel strips with a thickness of 0.05mm-1mm and a width of 600mm-1200mm, a vertical bright annealing unit is used for vertical bright annealing. The TV value and process speed of the unit are determined based on the unit's annual output, production specifications, and annual production time. The inlet and outlet speeds of the unit for different specifications of stainless steel strips are determined based on the process speed, inlet section downtime, outlet section downtime, and the length of the stainless steel strip. The effective looper quantity at the inlet is determined based on the inlet section downtime, and the effective looper quantity at the outlet is determined based on the outlet section downtime. The roller diameter and the spacing between the rollers are determined based on the thickness specifications of the stainless steel strip.

[0007] Furthermore, the TV value and process speed of the unit are initially determined based on the unit's annual output, production specifications, and annual production time. Then, the annual production time is calculated based on the initially determined TV value and process speed. If the annual production time can reach 7,500 hours, the TV value and process speed are determined. If the annual production time is less than 7,500 hours, the TV value and process speed are re-determined.

[0008] Furthermore, the formula for calculating the inlet velocity is: VE 入 =(A 入×L / VP×60-A 入 ×T 入 +SQRT(A 入 ×(T 入 -L / VP×60)×A 入 ×(T 入 -L / VP×60)-4×A 入 ×L 入 )) / (2×60); where, VE 入 VP is the inlet section velocity, in m / min; T is the process section velocity, in m / min. 入 The inlet section downtime is measured in seconds (s); A 入 The acceleration at the entrance segment is expressed in m / s². 2 L represents the length of the stainless steel strip, in meters.

[0009] The formula for calculating the exit section speed is: VE 出 =(A 出 ×L / VP×60-A 出 ×T 出 +SQRT(A 出 ×(T 出 -L / VP×60)×A 出 ×(T 出 -L / VP×60)-4×A 出 ×L 出 )) / (2×60); where, VE 出 The velocity at the outlet section is in m / min; VP is the velocity at the process section, in m / min; T 出 The unit for the downtime at the export section is seconds (s); A 出 This refers to the acceleration at the exit section, in m / s². 2 L represents the length of the stainless steel strip, in meters (m).

[0010] Furthermore, the formula for calculating the effective quantity of the entry looper is: LE 入 =T 入 ×VP+VP 2 / (A 入 ×60); where LE 入 The effective looper quantity at the inlet is expressed in meters (m); VP is the process speed in the process section, expressed in meters per minute (m / min); T 入 For the inlet section downtime; A 入 The acceleration at the entrance segment is expressed in m / s². 2 ;

[0011] The formula for calculating the effective quantity of exported loopers is: LE 出 =T 出 ×VP+VP 2 / (A 出×60); where LE 出 The effective looper quantity at the export location is expressed in meters (m); VP represents the process speed in meters per minute (m / min); T... 出 This refers to the downtime at the export section; A 出 This refers to the acceleration at the exit section, in m / s². 2 .

[0012] Furthermore, the formula for calculating the diameter of the rollers for the entire line is: D≥(1-α)×(H×E) / δ smin Where D is the roller diameter (mm); H is the thickness of the stainless steel strip (mm); E is the elastic modulus of the stainless steel strip (MPa); α is the yield deformation ratio of the stainless steel strip; δ smin This represents the minimum yield strength of stainless steel strip, expressed in MPa.

[0013] Furthermore, for stainless steel strips with a thickness of 1mm, the plastic deformation ratio is allowed to be ≤50%.

[0014] Furthermore, the vertical bright annealing unit includes, in sequence along the processing path, an uncoiler, a welding machine, an edge trimmer, a first tension roller, a cleaning section, a second tension roller, an inlet looper, a third tension roller, a tension release device, an annealing furnace, a cooling device, a fourth tension roller, an outlet looper, a fifth tension roller, a surface inspection station, an outlet shear, and a coiler.

[0015] Furthermore, the vertical bright annealing unit is equipped with two uncoilers at the inlet and one coiler at the outlet. The uncoilers and coilers are arranged on the same side of the unit, and the inlet looper and outlet looper are arranged on the same side of the furnace area of ​​the unit, with the inlet looper arranged above the outlet looper.

[0016] Furthermore, in the inlet and outlet loopers, the distance between the bottom roller and the looper car rollers is controlled within 15 meters.

[0017] The beneficial effects of this invention are:

[0018] This method provides a complete design process reference for the bright vertical annealing process of ultra-thin wide-band stainless steel, filling the current gap in the bright vertical annealing process of ultra-thin wide-band stainless steel. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a vertical bright annealing unit in an embodiment of the present invention.

[0020] In the diagram: 1-First uncoiler; 2-Second uncoiler; 3-Welding machine; 4-Edge trimmer; 5-First tension roller; 6-Washing section; 7-Second tension roller; 8-Inlet looper; 9-Third tension roller; 10-Tension release device; 11-Anti-heating furnace; 12-Cooling device; 13-Fourth tension roller; 14-Outlet looper; 15-Fifth tension roller; 16-Surface inspection station; 17-Outlet shear; 18-Winder. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] This embodiment discloses a design method for a bright vertical annealing process for ultra-thin wide strip stainless steel. For stainless steel strips with a thickness of 0.05mm-1mm and a width of 600mm-1200mm, a vertical bright annealing unit is used. The TV value (the product of the strip thickness and the maximum allowable process speed for that thickness) and process speed of the unit are determined based on the unit's annual output, production specifications, and annual production time. The inlet and outlet speeds for different specifications of stainless steel strips are determined based on the process speed, inlet section downtime, outlet section downtime, and the length of the stainless steel strip. The effective looper quantity at the inlet is determined based on the inlet section downtime, and the effective looper quantity at the outlet is determined based on the outlet section downtime. The roller diameter and roller spacing of the entire line are determined based on the thickness specifications of the stainless steel strip. This method provides a complete design process reference for the bright vertical annealing process of ultra-thin wide strip stainless steel, filling a gap in current ultra-thin wide strip stainless steel bright vertical annealing technology.

[0023] Specifically, in this embodiment, the TV value and process speed of the unit are initially determined based on the unit's annual output, production specifications, and annual production time. Then, the annual production time is calculated based on the initially determined TV value and process speed. If the annual production time can reach 7,500 hours, the TV value and process speed are determined. If the annual production time is less than 7,500 hours, the TV value and process speed are re-determined.

[0024] In this embodiment, the inlet section velocity is calculated as: VE 入 =(A 入 ×L / VP×60-A 入 ×T 入 +SQRT(A 入 ×(T 入 -L / VP×60)×A 入 ×(T 入 -L / VP×60)-4×A 入 ×L 入 )) / (2×60); where, VE 入VP is the inlet section velocity, in m / min; T is the process section velocity, in m / min. 入 The inlet section downtime is measured in seconds (s); A 入 The acceleration at the entrance segment is expressed in m / s². 2 L represents the length of the stainless steel strip, in meters; the formula for calculating the velocity at the exit section is: VE 出 =(A 出 ×L / VP×60-A 出 ×T 出 +SQRT(A 出 ×(T 出 -L / VP×60)×A 出 ×(T 出 -L / VP×60)-4×A 出 ×L 出 )) / (2×60); where, VE 出 The velocity at the outlet section is in m / min; VP is the velocity at the process section, in m / min; T 出 The unit for the downtime at the export section is seconds (s); A 出 This refers to the acceleration at the exit section, in m / s². 2 L represents the length of the stainless steel strip, in meters (m).

[0025] In this embodiment, the formula for calculating the effective amount of slip loop at the inlet is: LE 入 =T 入 ×VP+VP 2 / (A 入 ×60); where LE 入 The effective looper quantity at the inlet is expressed in meters (m); VP is the process speed in the process section, expressed in meters per minute (m / min); T 入 For the inlet section downtime; A 入 The acceleration at the entrance segment is expressed in m / s². 2 The formula for calculating the effective quantity of exported loopers is: LE 出 =T 出 ×VP+VP 2 / (A 出 ×60); where LE 出 The effective looper quantity at the export location is expressed in meters (m); VP represents the process speed in meters per minute (m / min); T... 出 This refers to the downtime at the export section; A 出 This refers to the acceleration at the exit section, in m / s². 2 .

[0026] In this embodiment, the formula for calculating the diameter of the rollers on the entire line is: D≥(1-α)×(H×E) / δ sminWhere D is the roller diameter (mm); H is the thickness of the stainless steel strip (mm); E is the elastic modulus of the stainless steel strip (MPa); α is the yield deformation ratio of the stainless steel strip; δ smin This represents the minimum yield strength of stainless steel strip, expressed in MPa. For stainless steel strip with a thickness of 1 mm, the allowable plastic deformation percentage is ≤50%.

[0027] like Figure 1 As shown, in this embodiment, the vertical bright annealing unit includes an uncoiler, a welding machine, an edge trimmer, a first tension roller, a cleaning section, a second tension roller, an inlet looper, a third tension roller, a tension release device, an annealing furnace, a cooling device, a fourth tension roller, an outlet looper, a fifth tension roller, a surface inspection station, an outlet shear, and a coiler arranged sequentially along the processing path.

[0028] like Figure 1 As shown in this embodiment, the vertical bright annealing unit is equipped with two uncoilers at the inlet and one coiler at the outlet. The uncoilers and coilers are arranged on the same side of the unit, and the inlet looper and outlet looper are arranged on the same side of the furnace area of ​​the unit, with the inlet looper arranged above the outlet looper. The above arrangement can shorten the length of the unit, while saving factory space, saving factory investment and reducing production costs.

[0029] In this embodiment, the distance between the bottom roller and the roller of the looper car is controlled within 15 meters in the inlet looper and the outlet looper to ensure the stability of the thin strip steel when the looper is filled and unloaded.

[0030] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A method for designing a bright vertical annealing process for ultra-thin wide-band stainless steel, characterized in that: For stainless steel strips with a thickness of 0.05mm-1mm and a width of 600mm-1200mm, vertical bright annealing units are used for vertical bright annealing. The TV value and process speed of the unit are determined based on the unit's annual output, production specifications, and annual production time. The inlet and outlet speeds of the unit for different specifications of stainless steel strips are determined based on the process speed, inlet section downtime, outlet section downtime, and the length of the stainless steel strip. The effective looper quantity of the inlet looper is determined based on the inlet section downtime, and the effective looper quantity of the outlet looper is determined based on the outlet section downtime. The roll diameter of the entire line and the spacing between the rolls are determined based on the thickness specifications of the stainless steel strip. First, determine the TV value and process speed of the unit based on the unit's annual output, production specifications, and annual production time. Then, calculate the annual production time based on the initially determined TV value and process speed. If the annual production time can reach 7,500 hours, determine the TV value and process speed. If the annual production time is less than 7,500 hours, re-determine the TV value and process speed. The calculation formula of the inlet section velocity is: VE 入 = (A 入 × L / VP × 60 - A 入 × T 入 + SQRT (A 入 × (T 入 - L / VP × 60) × A 入 × (T 入 - L / VP × 60) - 4 × A 入 × L 入 ) / (2 × 60) ; Among them, VE 入 VP is the inlet section velocity, in m / min; T is the process section velocity, in m / min. 入 The inlet section downtime is measured in seconds (s); A 入 The acceleration at the entrance segment is expressed in m / s². 2 L represents the length of the stainless steel strip, in meters. The formula for calculating the exit section speed is: VE 出 =(A 出 ×L / VP×60-A 出 ×T 出 +SQRT(A 出 ×(T 出 -L / VP×60)×A 出 ×(T 出 -L / VP×60)-4×A 出 ×L 出 )) / (2×60); where, VE 出 The velocity is the exit section velocity, in m / min; VP is the process section velocity, in m / min; T 出 The unit for the downtime at the export section is seconds (s); A 出 This refers to the acceleration at the exit section, in m / s². 2 L represents the length of the stainless steel strip, in meters. The formula for calculating the effective amount of looper at the entrance is: LE 入 =T 入 ×VP+VP 2 / (A 入 ×60); where LE 入 The effective looper quantity at the inlet is expressed in meters (m); VP is the process speed in the process section, expressed in meters per minute (m / min); T 入 For the inlet section downtime; A 入 The acceleration at the entrance segment is expressed in m / s². 2 ; The formula for calculating the effective quantity of exported loopers is: LE 出 =T 出 ×VP+VP 2 / (A 出 ×60); where LE 出 The effective looper quantity at the export location is expressed in meters (m); VP represents the process speed in meters per minute (m / min); T... 出 This refers to the downtime at the export section; A 出 This refers to the acceleration at the exit section, in m / s². 2 ; The formula for calculating the diameter of all rollers in the production line is: D≥(1-α)×(H×E) / δ smin Where D is the roller diameter (mm); H is the thickness of the stainless steel strip (mm); E is the elastic modulus of the stainless steel strip (MPa); α is the yield deformation ratio of the stainless steel strip; δ smin This represents the minimum yield strength of stainless steel strip, expressed in MPa.

2. The design method for the bright vertical annealing process of ultra-thin wide stainless steel as described in claim 1, characterized in that: For stainless steel strip with a thickness of 1mm, the plastic deformation ratio is allowed to be ≤50%.

3. The design method for the bright vertical annealing process of ultra-thin wide stainless steel as described in claim 1, characterized in that: The vertical bright annealing unit used includes an uncoiler, a welding machine, an edge trimmer, a first tension roller, a cleaning section, a second tension roller, an inlet looper, a third tension roller, a tension release device, an annealing furnace, a cooling device, a fourth tension roller, an outlet looper, a fifth tension roller, a surface inspection station, an outlet shear, and a coiler, arranged sequentially along the processing path.

4. The design method for the bright vertical annealing process of ultra-thin wide stainless steel as described in claim 3, characterized in that: The vertical bright annealing unit has two uncoilers at the inlet and one coiler at the outlet. The uncoilers and coilers are located on the same side of the unit. The inlet looper and the outlet looper are located on the same side of the furnace area of ​​the unit, with the inlet looper located above the outlet looper.

5. The design method for the bright vertical annealing process of ultra-thin wide stainless steel as described in claim 3, characterized in that: In the inlet and outlet loopers, the distance between the bottom roller and the looper car rollers is controlled within 15 meters.

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