Process method for producing checkered plate on continuous wet-type leveling line

Abstract

The invention relates to the technical field of producing a checkered plate by using a continuous wet-type leveling line in a cold state of an ESP hot-rolled coiled plate, and particularly discloses a process method for producing the checkered plate by using the continuous wet-type leveling line, the ESP hot-rolled checkered coiled plate is characterized in that the checkered coiled plate is produced by an ESP production line through three roughing mills, an induction heating furnace, a high-pressure descaling device, five finishing mills, a laminar cooling section and a coiling machine; a checkered plate is produced through a continuous wet-type leveling line, wherein the checkered plate is produced through leveling rolling of the checkered rolled plate; in the ESP hot rolling pattern plate rolling procedure, a thin gauge pattern plate with the thickness smaller than or equal to 1.0 mm is rolled through an uncoiler, a straight head machine, a slitting shear, a laser welding machine, a 1 # withdrawal and straightening machine, a wet type temper mill, a drying machine, a 2 # withdrawal and straightening machine, a flying shear and a coiler; the checkered plate is rolled through the ESP hot-rolled coiled plate by adopting the continuous wet-type leveling line, cold-state continuous rolling of the 1.0 mm checkered plate is achieved, the lower limit of the specification of the hot-rolled checkered plate is broken through, the market blank is filled, and the product competitiveness is improved.

Description

Technical Field

[0001] The invention relates to the technical field of producing patterned plates by using a continuous wet leveling line for ESP hot-rolled coils in a cold state, and in particular to a process for producing patterned plates by using a continuous wet leveling line. Background Art

[0002] ESP hot rolled coil technology is developed on the basis of Demag's ISP technology. The continuous casting machine in its production line adopts parallel plate straight-arc crystallizer, and the casting guide adopts a casting and rolling structure. The casting is directly rolled into medium and thick plates after the liquid core is pressed down, and then it can be sold off the line after shearing. The slabs that are not off the line are induction heated and then rolled into thin strips by five finishing mills, which are then curled into coils after cooling. The ESP process production line is compactly arranged, does not use long heating furnaces or Cremona furnaces, and the total length of the production line is only 190m.

[0003] Main technical features of ESP hot rolled coil process:

[0004] 1. Higher casting speed. Higher casting speed can be achieved by optimizing casting machine configuration and increasing the flexibility of thickness and casting speed. Mathematical simulation of computer-optimized fluid dynamics calculations and (physical) water model tests shows that the current casting speed of 5-6m / min can still be greatly improved.

[0005] 2. Stable process control during casting. The most significant improvements have been made in the stable control of ingot forming and slab solidification, and the protective slag required for different steel grades has also been optimized. By controlling the friction and the angle arrangement of the crystallizer, stable control at high casting speeds has now been achieved.

[0006] 3. Extensive application of automation technology. Improvements in technical process control, sensor technology, data management and process are the key to success. In terms of thickness control, temperature control, plate shape control and flatness control, the central network strengthens the flexibility and standardization of process models. For example, the "microstructure target cooling" package can control the metallurgical parameters of the strip. In the ESP line, automation runs through the entire process from casting to cooling.

[0007] Checkered plates are favored by the market for their unique texture and diverse application scenarios. In practical applications, they can provide functional advantages such as anti-slip and wear resistance. With the development of the market, customers have more and more demands for 1.0mm thin-gauge checkered plates. ESP hot rolling can only continuously and stably roll 1.4mm checkered plates and 1.0mm smooth hot-rolled coils. It is difficult to achieve batch and stable production of 1.0mm hot-rolled checkered plates, and 1.0mm checkered plates are still blank in the market. In order to occupy the market and improve the company's efficiency, a wet leveling line process technology that can continuously and stably produce 1.0mm checkered plates is urgently needed to solve the problem of the blank in the existing 1.0mm checkered plate production. Summary of the invention

[0008] In view of the problems existing in the prior art, the object of the present invention is to provide a process for producing patterned plates using a continuous wet leveling line.

[0009] The technical solution adopted by the present invention to solve the technical problem is: a process for producing a patterned plate by a continuous wet leveling line, comprising the following steps:

[0010] S1, ESP hot-rolled patterned coil: The ESP production line produces patterned coils through three roughing mills, induction heating furnaces, high-pressure descaling, five finishing mills, laminar cooling sections and coilers;

[0011] S2. Continuous wet flattening line for producing patterned plates: Patterned coils are flattened and rolled to produce patterned plates;

[0012] S3, ESP hot-rolled patterned plate process is rolled into thin patterned plate with thickness ≤1.0mm through uncoiler, straightening machine, slitting shear, laser welder, 1# straightening machine, wet leveler, dryer, 2# straightening machine, flying shear and coiler.

[0013] Preferably, the ESP hot-rolled patterned coil in step S1 uses low-temperature ferrite rolling raw materials with a yield strength of ≤290MPa and a local high point of the cross section of ≤10μm. The ESP production line is heated in a converter and cast in a continuous caster before entering the three-pass roughing mill.

[0014] Preferably, the five-pass finishing mill in step S1 controls the surface pattern rolling of the strip.

[0015] Preferably, the specific steps of producing the patterned plate by the continuous wet leveling line in step S2 are:

[0016] S21, ESP hot-rolled patterned coils are straightened at the head and tail after double uncoiling, and then enter the laser welder for head and tail welding through the common pinch roller. The strip steel is buffered through the entrance looper to achieve the purpose of continuous production of steel coils;

[0017] S22, the strip is straightened and stretched by the 1# straightening machine to improve the plate shape, and then rolled into a patterned plate by a wet leveling mill;

[0018] S23, after leaving the leveling machine, use the compressed air blowing beam to blow away the water marks on the surface of the strip and then enter the dryer for drying;

[0019] S24, after drying, the strip enters the 2# straightening machine to further improve the strip shape after rolling, and is buffered in the exit looper, and then cut and curled.

[0020] Preferably, the elongation of the 1# straightening machine is 0.4±0.1%, the bending roller box staggered degree is 40±5mm, and the straightening roller box staggered degree is 30±5mm; the elongation of the 2# straightening machine is 0.2±0.1%, the bending roller box staggered degree is 30±5mm, and the straightening roller box staggered degree is 20±5mm.

[0021] Preferably, the flattening machine is a four-roller wet flattening machine, the flattening machine production speed is 60-200m / min, the flattening machine uses a flattening liquid and a desalted water mixture to prepare a mixed liquid with a conductivity of 1200±300μm / cm, the flattening liquid stock concentration is 4%±1%, the conductivity of the desalted water is <20μm / cm, and the mixed liquid spray flow rate is 1.0±0.2m 3 / h, the skin-pass mill adopts rolling force mode, and the front and rear tension control range is 70KN-110KN.

[0022] Preferably, the working roll design of the leveling machine is as follows: the support roll is made of Cr3, the working roll is made of cast iron roll, the roll bean width of the upper working roll is 5.5mm / bean length is 28mm / bean depth is 1.8mm, and the lower working roll is a smooth roll.

[0023] Preferably, the flattening mill rolls are designed as follows: the working rolls have a roll crown of +0.07-0.10 mm, and the backup rolls have a roll crown of +0.05-0.08 mm.

[0024] Preferably, the ESP hot-rolled patterned coil is used to roll a patterned plate product with a bean height ratio of 6%-12%.

[0025] The present invention has the following beneficial effects:

[0026] The process method for producing patterned plates using a continuous wet leveling line designed by the present invention adopts a continuous wet leveling line to roll patterned plates using ESP hot rolled coils, thereby achieving cold continuous rolling of 1.0 mm patterned plates, breaking through the lower limit of hot rolled patterned plates, filling the market gap and enhancing product competitiveness.

[0027] The process method for producing patterned plates by a continuous wet leveling line designed by the present invention can achieve a monthly output of 3,000 tons of patterned plates with a specification of ≤1.0 mm, and the patterned plates' plate shape, bean height ratio and surface quality meet standard requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the production process flow chart of ESP hot rolled patterned coil.

[0029] Figure 2 This is the production process flow chart of patterned plates produced by continuous wet leveling line.

[0030] Figure 3 It is a table chart of operating data of Example 1 of the process method for producing patterned plates by a continuous wet leveling line. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely further describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] like Figure 1-Figure 2 As shown, a process for producing a patterned plate using a continuous wet leveling line comprises the following steps:

[0033] 1. ESP hot-rolled patterned coil: ESP hot-rolled patterned coil adopts low-temperature ferrite rolling raw materials, with yield strength ≤290MPa and local high point of section ≤10μm.

[0034] like Figure 1 As shown in the figure, the ESP production line is heated in a converter and cast in a continuous casting machine before entering the three-pass roughing mill. The ESP production line produces patterned coils through three-pass roughing mills, induction heating furnaces, high-pressure descaling, five-pass finishing mills, laminar cooling sections and coilers. The surface pattern rolling of the strip is mainly achieved by using pattern rollers in the finishing rolling F5 mill, and hot-rolled patterned coils ≥ 1.2 mm are rolled in batches and stably; 1.0 mm hot-rolled patterned coils cannot be produced continuously and stably due to problems such as pattern roller collapse and heavy rolling load.

[0035] 2. Continuous wet leveling line for producing patterned plates: The patterned coils are leveled and rolled to produce patterned plates; the continuous wet leveling line is used to level and roll the ESP hot-rolled coils to produce patterned plates. By selecting a certain type of leveling liquid product and adjusting the process parameters, the rolling load of the leveling mill is reduced, the wear of the working rolls of the leveling mill is reduced, and the running speed of the production line is increased to achieve the purpose of increasing production and reducing speed.

[0036] 3. If Figure 2 As shown, the ESP hot-rolled patterned plate coiling process is rolled into a thin-gauge patterned plate with a thickness of ≤1.0mm through an uncoiler, a straightening machine, a slitting shear, a laser welder, a No. 1 straightening machine, a wet leveler, a dryer, a No. 2 straightening machine, a flying shear, and a coiler.

[0037] The specific steps of producing patterned plates on a continuous wet leveling line are:

[0038] (1) After double uncoiling, the ESP hot-rolled patterned coil is straightened at the head and tail and then enters the laser welder for head and tail welding through a common pinch roller. The strip is buffered through the entrance looper to achieve the purpose of continuous production of steel coils.

[0039] (2) The strip is straightened and stretched by the No. 1 straightening machine to improve the plate shape, and then rolled into a patterned plate by a wet leveling mill. The elongation of the No. 1 straightening machine is 0.4±0.1%, the staggered degree of the bending roller box is 40±5mm, and the staggered degree of the straightening roller box is 30±5mm.

[0040] (3) After leaving the leveling machine, the water marks on the surface of the strip are blown away by a compressed air blowing beam and then the strip enters the dryer for drying.

[0041] (4) After drying, the strip enters the No. 2 straightening machine to further improve the strip shape after rolling, and is buffered by the exit looper, and then slit and curled. The elongation of the No. 2 straightening machine is 0.2±0.1%, the staggered degree of the bending roller box is 30±5mm, and the staggered degree of the straightening roller box is 20±5mm.

[0042] (5) The flattening machine is a four-roller wet flattening machine with a production speed of 60-200 m / min. The flattening machine uses a mixture of flattening liquid and desalted water to prepare a mixed liquid with a conductivity of 1200±300 μm / cm. The concentration of the flattening liquid is 4%±1%, the conductivity of the desalted water is <20 μm / cm, and the spray flow rate of the mixed liquid is 1.0±0.2m 3 / h, the skin-pass mill adopts rolling force mode, and the front and rear tension control range is 70KN / 110KN.

[0043] The working roll design of the leveling machine: the support roll is made of Cr3, the working roll is made of cast iron roll, the roll bean width of the upper working roll is 5.5mm / bean length is 28mm / bean depth is 1.8mm, and the lower working roll is a smooth roll.

[0044] Leveling mill roll design: the working roll has a roll crown of +0.07-0.10mm, and the backup roll has a roll crown of +0.05-0.08mm.

[0045] (6) ESP hot-rolled patterned coils are rolled into patterned plate products with a bean height ratio of 6%-12%, and the plate shape and performance of the patterned plate can meet the standards.

[0046] Embodiment 1:

[0047] like Figure 3As shown, taking the actual production and operation data of the rolled patterned plate in early September 2024 as an example, the material of the ESP hot-rolled patterned coil is Q235B, the specification is 1.05*1250mm; the upper roller bean width of the leveling machine working roller is 5.5mm / bean length is 28mm / bean depth is 1.8mm, the conductivity of the leveling liquid mixture is 1300μm / cm (the concentration of the original liquid is about 3.5%), and the mixed liquid spray flow rate is 1.08m 3 / h, the rolling force of the leveler is 6500±500KN, the front and rear tension of the leveler is set at 90KN / 105KN, and the rolling speed of the leveler is 80-100m / min; the elongation of the 1# straightening machine is 0.4%, that of the 2# straightening machine is 0.2%, the drying temperature of the dryer is ≥90℃, the shape of the patterned plate is good, and the bean height ratio of 8.4%-9.6% meets the requirements.

[0048] The ESP hot-rolled coils are rolled into patterned plates through a continuous wet leveling line, initially achieving a monthly output of 3,000 tons of patterned plates with a specification of ≤1.0mm. The pattern, bean height ratio and surface quality of the patterned plates meet the standard requirements. According to the benefit calculation of 400 yuan / t, the annual profit can be: 3,000 tons*12 months*400 yuan / t=14.4 million yuan.

[0049] The present invention is not limited to the above-mentioned implementation modes, and anyone should be aware of the structural changes made under the enlightenment of the present invention, and all those having the same or similar technical solutions as the present invention fall within the protection scope of the present invention.

[0050] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A process for producing patterned plates using a continuous wet leveling line, characterized in that: The following steps are involved: S1, ESP hot-rolled patterned coil: The ESP production line produces patterned coils through three roughing mills, induction heating furnaces, high-pressure descaling, five finishing mills, laminar cooling sections and coilers; S2. Continuous wet flattening line for producing patterned plates: Patterned coils are flattened and rolled to produce patterned plates; S3, ESP hot-rolled patterned plate process is rolled into thin patterned plate with thickness ≤1.0mm through uncoiler, straightening machine, slitting shear, laser welder, 1# straightening machine, wet leveler, dryer, 2# straightening machine, flying shear and coiler.

2. The process for producing patterned plates using a continuous wet leveling line according to claim 1, characterized in that: The ESP hot-rolled patterned coil in step S1 uses low-temperature ferrite rolling raw materials with a yield strength of ≤290 MPa and a local high point of the cross section of ≤10 μm. The ESP production line is heated in a converter and cast in a continuous caster before entering the three-pass roughing mill.

3. The process for producing patterned plates using a continuous wet leveling line according to claim 1, characterized in that: The five-pass finishing mill in step S1 controls the surface pattern rolling of the strip.

4. The process for producing patterned plates using a continuous wet leveling line according to claim 1, characterized in that: The specific steps of producing the patterned plate on the continuous wet leveling line in step S2 are: S21, ESP hot-rolled patterned coils are straightened at the head and tail after double uncoiling, and then enter the laser welder for head and tail welding through the common pinch roller. The strip steel is buffered through the entrance looper to achieve the purpose of continuous production of steel coils; S22, the strip is straightened and stretched by the 1# straightening machine to improve the plate shape, and then rolled into a patterned plate by a wet leveling mill; S23, after leaving the leveling machine, use the compressed air blowing beam to blow away the water marks on the surface of the strip and then enter the dryer for drying; S24, after drying, the strip enters the 2# straightening machine to further improve the strip shape after rolling, and is buffered in the exit looper, and then cut and curled.

5. The process for producing patterned plates using a continuous wet leveling line according to claim 4 is characterized in that: The elongation of the 1# straightening machine is 0.4±0.1%, the bending roller box staggered degree is 40±5mm, and the straightening roller box staggered degree is 30±5mm; the elongation of the 2# straightening machine is 0.2±0.1%, the bending roller box staggered degree is 30±5mm, and the straightening roller box staggered degree is 20±5mm.

6. The process for producing patterned plates using a continuous wet leveling line according to claim 4, characterized in that: The flattening machine is a four-roller wet flattening machine with a production speed of 60-200 m / min. The flattening machine uses a flattening liquid and desalted water to mix to prepare a mixed liquid with a conductivity of 1200±300 μm / cm. The concentration of the flattening liquid is 4%±1%, the conductivity of the desalted water is <20 μm / cm, and the spray flow rate of the mixed liquid is 1.0±0.2m 3 / h, the skin-pass mill adopts rolling force mode, and the front and rear tension control range is 70KN-110KN.

7. The process for producing patterned plates using a continuous wet leveling line according to claim 4, characterized in that: The working roll design of the leveling machine: the support roll is made of Cr3, the working roll is made of cast iron roll, the roll bean width of the upper working roll is 5.5mm / bean length is 28mm / bean depth is 1.8mm, and the lower working roll is a smooth roll.

8. The process for producing patterned plates using a continuous wet leveling line according to claim 4, characterized in that: The flat-pass mill roll design has a roll crown of +0.07-0.10 mm for the working roll and a roll crown of +0.05-0.08 mm for the backup roll.

9. The process for producing patterned plates using a continuous wet leveling line according to claim 4, characterized in that: The ESP hot-rolled patterned coil is a patterned plate product with a bean curd ratio of 6%-12%.

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