CN114669613B - Flexible roller contact type Bao Daizu cooling method - Google Patents
Flexible roller contact type Bao Daizu cooling method Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0012—Rolls; Roll arrangements
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B2045/0212—Cooling devices, e.g. using gaseous coolants using gaseous coolants
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Abstract
The invention discloses a Bao Daizu combined cooling method of a flexible roller contact type, and belongs to the technical field of deep processing of steel materials. The method of the invention uses 3-12 sections of flexible roller cooling devices to cool the thin strip with the thickness of 0.005-0.05 mm to the end temperature of 25-35 ℃, wherein the cooling medium in the 3-12 sections of flexible roller cooling devices is m sections of hot water, n sections of cold water and l sections of liquid nitrogen in sequence, a, b and c are natural numbers, and a+b+c is equal to 3-12. The composite sectional cooling device can be used for cooling stages of heat treatment processes of metal thin strips and ultrathin strips of stainless steel and the like, has wide application range, can control cooling speed and end cooling temperature by controlling the concentration sum of cooling medium and jet cooling gas of each section of cooling device, ensures that the cooled strip steel surface becomes clean, has good plate shape, and can obtain high-performance thin-specification strip products.
Description
Technical Field
The invention relates to the technical field of deep processing of steel materials, in particular to a Bao Daizu cooling method of a flexible roller contact type.
Background
The current main way to produce ultrathin strips and ultrathin strips is to roll 0.1-2 mm plate strips into 0.004-0.05 mm ultrathin strips by a multi-roller mill or an asynchronous mill. Industrial production of extremely thin strips is widely applied to a multi-roller mill, wherein the production efficiency and the effect of the Sendzimir twenty-roller mill are best, and the Sendzimir mill consists of a small-diameter working roller and a huge working roller system, so that the internal structure is fine and complex, and the manufacturing cost is high; in recent years, some universities and research institutions also use asynchronous rolling as research objects to design an asynchronous rolling mill, the rolling principle of the asynchronous rolling mill is that the rolling force peak value during thinning is reduced by forming compression, shearing and pulling stress in a deformation area of a rolled piece through different rotating speeds of upper working rolls and lower working rolls, and the latest data show that the asynchronous rolling mill with the working roll diameter of 50mm rolls a 430 stainless steel strip with the diameter of 0.1 multiplied by 72mm into a stainless steel ultrathin strip with the diameter of 0.004 multiplied by 72mm through multiple passes.
The two cold rolling mills are used for forming the ultrathin strips, wherein the single-pass pressing rate is about 20% and the total pressing rate is about 90% by pressing in multiple passes. The high rolling reduction of the pass causes serious work hardening of the metal ultrathin strip, the internal stress is high, the appearance is that the ultrathin strip surface is wrinkled, the subsequent processing and use can be influenced, and therefore, the ultrathin strip needs to be annealed.
Different control cooling modes are required for controlling the structure and the performance of the thin strip and the ultrathin strip in the annealing process, wherein the cooling rate and the end point cooling temperature control of the cooling stage are difficult problems when the stainless steel thin strip and the ultrathin strip are annealed. At present, common cooling methods comprise modes of air cooling, gas jet cooling, contact cooling by a cooling roller with adjustable speed and the like, but the expected end temperature is difficult to control only by the flexible cooling roller, and the cooling speed is not fast enough; in addition, the roller surface is easily deformed by adjusting the contact length of the flexible roller and the strip, so that the surface of the strip is unevenly cooled. In view of the above, there is currently a lack of reasonably efficient cooling of thin strips in the industry.
The rapid cooling device for metal plate strip as in patent CN200920289136.3 is characterized in that the spray area of the two-side cooling device covers the whole area of the plate strip, and the cooling gas flows out at high speed through the spray holes or spray slits on the wind direction surface and is sprayed onto the surface of the hot metal product, thereby cooling; an air-cooled steel strip annealing and cooling mechanism as mentioned in patent CN201320548479.3 is characterized by comprising a shell, an air sleeve liner, an air blowing pipeline, a fan and a motor, wherein the air blowing pipeline which is matched and combined with the air blowing pipeline is arranged in the inlet direction of the steel strip, and cold air enters a cavity between the shell and the air sleeve liner through the air blowing pipeline. The rapid cooling and deformation preventing device for the small-specification metal or alloy thin strip is characterized by simple structure, rapid cooling and deformation prevention for the metal thin strip, as described in patent CN 200920223069.5; and a gas jet cooling apparatus as described in patent CN200510072650.8, in which windboxes provided on both sides of a steel strip in a cooling chamber blow cooling gas through nozzles to cool the steel strip.
The main problems of the above application are that the deviation of the cooling speed control is large, the cooling is not uniform enough, the cooling end temperature is difficult to control, and the high cooling speed is difficult to reach; in particular, the cooling rates required for different materials, different sizes of thin strips, are also different, so the versatility of the cooling means of the above device is relatively poor.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to solve the problems that the cooling speed is difficult to control, the application range of equipment is narrow, the cooling effect is not obvious when the thickness of the strip changes, the cooling end temperature is not controllable and the like in the cooling process of the thin strip and the ultrathin strip. The invention discloses a Bao Daizu combined cooling method of a flexible roller, which can stably produce a high-performance thin-specification strip product with clean surface and good plate shape by designing a flexible roller cooling device and controlling the cooling rate and the cooling end temperature.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a Bao Daizu cooling method of flexible roller contact type regulates and controls cooling speed by changing cooling medium in the flexible roller, controls end cooling temperature (such as controlling 0.005-0.05 mm thin belt, cooling end temperature is 25-35 ℃), concretely comprises: for a thin belt with the thickness of 0.005-0.05 mm, a 3-12 section flexible roller cooling device is used for cooling the thin belt to the end temperature of 25-35 ℃, wherein cooling mediums in the 3-12 section flexible roller cooling device are an a section hot water section, a b section cold water section and a c section liquid nitrogen section in sequence, a, b and c are natural numbers, and a+b+c is equal to 3-12.
Further, the temperature of the hot water section is 40-100 ℃, the temperature of the cold water section is 10-25 ℃, and the temperature of the liquid nitrogen section is lower than-190 ℃.
Furthermore, 3-12 sections of combined cooling can be selected according to the requirements, the minimum number is 3 sections, and the maximum number is 12 sections, for example, a 3-section flexible roller cooling device is used for cooling the thin belt to the end temperature of 25-35 ℃, the cooling medium in the first section flexible roller cooling device is hot water, and the temperature is adjustable within the range of 40-100 ℃; the cooling medium in the second section flexible roller cooling device is cold water, and the temperature range is 10-25 ℃; the cooling medium in the third section flexible roller cooling device is liquid nitrogen, the temperature range is less than-190 ℃, and the cooling liquid in the flexible roller cooling device in each stage can be recycled.
Further, the arrangement is performed with the order of the hot water section, the cold water section, and the liquid nitrogen section unchanged, for example, a total of 6 sections, two hot water sections, two cold water sections, two liquid nitrogen sections, and for example, a total of 5 sections, two hot water sections, two cold water sections, and one liquid nitrogen section.
Furthermore, the upper surface and the lower surface of the thin strip at the front part of each flexible roller cooling device are respectively provided with a gas injection part, the gas injected by the gas injection parts adopts high-purity hydrogen, the flow rate of the hydrogen can be regulated and controlled, and the cooling speed is regulated and controlled by changing the flow rate of the injected cooling gas, namely, the flow rate of the injected hydrogen is set to be 2-30 m/s. The purpose of spraying hydrogen is to enable the thin belt to be cooled by air, and the effect is better when the thin belt is combined with a flexible roller for cooling.
Further, the gas spraying part is provided with a flat nozzle, and the angle between the nozzle and the surface of the thin belt can be adjusted within 15-40 degrees.
Further, the running speed of the thin belt in the device is controlled by the discharging device and the receiving device at two ends of the whole device, and the running speed of the thin belt in the flexible roller cooling device is 1-5 m/min.
Further, the cooling rate is regulated and controlled by regulating the pressure value in the elastic deformation range of the flexible roller, and the pressure of the flexible roller to the thin belt is limited to be 20-250 MPa. The pressure value is mainly used for controlling the contact area of the flexible roller and the thin belt, so as to control the cooling rate of the thin belt, and according to the characteristics of the flexible roller, the larger the pressure is, the larger the contact area of the roller and the thin belt is.
Furthermore, the surface roughness of the flexible roller is required to be 10-35 nm, namely, the surface quality of the strip is improved by polishing the surface of the flexible cooling roller with high precision.
Still further, the thin strip is a stainless steel ultra-thin strip, and the steel grade is 201, 304, 316 or 409.
Furthermore, due to the characteristic of inflammability and explosiveness of hydrogen, the whole device adopts full hydrogen protection in order to ensure that equipment runs safely and the surface quality of the thin belt is protected.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) The flexible roller gas jet composite sectional type thin strip cooling method provided by the invention can be used for cooling stages of heat treatment processes of metal thin strips such as stainless steel and ultrathin strips, and has wide application range; in the prior art, the terminal temperature is difficult to control accurately only through single air cooling or contact cooling without step adjustment; the cooling temperature is as accurate as possible, so that the internal tissue heat treatment process of the cooled thin strip can reach an ideal result, the different temperatures are different for the grain change rate of the thin strip, the higher the temperature is, the better the lower the temperature is, the better the temperature is, and the proper temperature ensures that the grain diffusion and growth efficiency is the highest; the end temperature is the temperature of the thin strip for changing the crystal grain at last, and is directly influenced on the final shaping of the crystal grain;
(2) The method is simple and feasible, the cooling speed and the end point cooling temperature can be controlled by controlling the concentration sum of cooling medium and jet cooling gas of each section of cooling device, and the produced strip steel has clean surface, good shape and high performance and is a thin-specification strip product;
(3) The cooling process is in the full hydrogen protective atmosphere, does not contact with the outside air, and can ensure that the injection speed and quality of the gas are not affected; the contact area between the flexible roller and the thin strip can be adjusted by controlling the pressure of the flexible roller, so that the cooling speed is controlled; the cooling speed of each section can be finely adjusted through multi-section cooling, so that the uniformity of the tissue performance of the thin belt and the ultrathin belt is ensured, and the product quality is improved.
Drawings
FIG. 1 is a schematic diagram of the cooling principle;
FIG. 2 is a schematic view of a structure of a gas injection part;
reference numerals in the schematic drawings illustrate:
1. a thin strip; 2. a discharging device; 3. a material receiving device; the cooling medium 1 is hot water; the cooling medium 2 is cold water; the cooling medium 3 is liquid nitrogen.
Detailed Description
Example 1
Referring to fig. 1-2, a method for cooling Bao Daizu by contact with a flexible roller according to this embodiment is as follows:
1. the 201 stainless steel ultrathin strip 1 rolled to be 0.04mm by an asynchronous reversible rolling mill is coiled on the coiling side of the rolling mill by a coiling machine, the coiled ultrathin strip is placed on a discharging device 2 at the inlet end of a flexible roller jet composite sectional cooling device, a movable end welding guiding strip of the ultrathin strip coil is taken, the guiding strip is a strip with the same steel grade as the ultrathin strip which needs to be cooled and is 1mm thick, the guiding strip is led to pass through the whole flexible roller jet composite sectional cooling device and is connected to a receiving device 3 at the other side of the cooling device, and more than two coils are coiled on the receiving device 3, so that the follow-up falling-off can be avoided when tension is applied on the ultrathin strip.
2. This ultra-thin band thickness is 0.04 mm's 201 stainless steel adopts 7 segmentation combination cooling, and first two sections flexible roller cooling medium is hot water, and middle three section flexible roller cooling medium is cold water, and last two sections flexible roller cooling medium is liquid nitrogen, before the flexible roller of installation, need to polish flexible roller device surface high accuracy, and the flexible roller surface roughness after polishing is 20nm, can guarantee ultra-thin band's surface quality like this, can reach mirror surface degree even, improves ultra-thin band's performance.
3. Simultaneously, the tension of the discharging device and the receiving device is set, so that the whole ultrathin strip is tensioned but not broken, and the receiving device is rotated to accurately stop the welding end of the ultrathin strip at the beginning of the first section of the cooling device. The flexible roller jet composite sectional cooling device is started, so that the device housing is filled with hydrogen, the whole cooling process is guaranteed to be carried out in the hydrogen atmosphere, and the running speed of 2m/min is set on the discharging device 1 and the receiving device 3, so that the ultrathin belt is uniformly cooled at the speed of 2 m/min.
4. After the cooling device is started, the ultrathin belt passes through sections 1 and 2, two sides of each flexible roller are provided with a gas injection part, the flow rate of hydrogen injected by the four gas injection parts is 15m/s, the inclination angle of a nozzle is 20 degrees, the cooling medium of the flexible roller is hot water at 80 ℃, the pressure between the rollers of the flexible rollers of sections 1 and 2 is 100MPa and 150MPa respectively, and the flexible rollers slightly deform when contacting the ultrathin belt due to larger pressure, so that the contact area between the flexible rollers and the ultrathin belt is increased, the cooling time is prolonged, and the cooling is more sufficient.
5. The ultrathin strip then passes through sections 3, 4 and 5, each section having the same structure as section 1, but six gas injection sections injecting hydrogen at a flow rate of 20m/s, a nozzle inclination angle of 25 degrees, a flexible roll cooling medium of 20 degrees, and a roll-to-roll pressure of 120MPa between the flexible rolls of sections 3, 4 and 5.
6. And finally, the ultrathin belt passes through sections 6 and 7, the structure of each section is the same as that of section 1, but the flow rate of the hydrogen sprayed by the four gas spraying parts is 25m/s, the inclination angle of the nozzle is 28 degrees, the cooling medium of the flexible roller is liquid nitrogen at the temperature of minus 192 ℃, and the pressure between the rollers of the sixth section and the seventh section of flexible roller is 150MPa and 130MPa respectively. The cooling speed of each section of ultrathin belt can be effectively regulated in a sectional cooling mode, and the temperature of cooling media is different, so that special heat treatment is performed on the ultrathin belt, the tissue performance inside the ultrathin belt is uniform, and the service performance of the ultrathin belt is improved.
7. And after the ultrathin belt on the discharging device is completely cooled, the final temperature of the ultrathin belt is 30 ℃, and the flexible roller jet composite sectional cooling device is closed. And taking down the cooled ultrathin belt on the material receiving device 3 by a coiling machine, cutting off the guiding belt at the front part of welding, attaching a label, and collecting in a warehouse.
Example 2
Referring to fig. 1-2, a method for cooling Bao Daizu by contact with a flexible roller according to this embodiment is as follows:
1. the method comprises the steps of rolling a 304 stainless steel ultrathin strip with the thickness of 0.005mm through an asynchronous reversible rolling mill, rolling the rolled ultrathin strip on a coiling machine at the coiling side of the rolling mill, placing the rolled ultrathin strip on a discharging device at the inlet end of a flexible roller jet composite sectional cooling device, taking a movable end welding guiding strip of the ultrathin strip coil, connecting the guiding strip to a receiving device 3 at the other side of the cooling device through the whole flexible roller jet composite sectional cooling device, and coiling the receiving device by more than two circles.
2. The ultrathin 304 stainless steel with the thickness of 0.005mm is cooled by adopting 3 sections of combination, the cooling medium of the first section of flexible roller is hot water, the cooling medium of the second section of flexible roller is cold water, the cooling medium of the third section of flexible roller is liquid nitrogen, and the surface of the flexible roller device needs to be polished with high precision before the flexible roller is installed, and the surface roughness of the polished flexible roller is 10nm.
3. Simultaneously, the tension of the discharging device and the receiving device is set, so that the whole ultrathin strip is tensioned but not broken, and the receiving device is rotated to accurately stop the welding end of the ultrathin strip at the beginning of the first section of the cooling device. The flexible roller jet composite sectional cooling device is started, so that the device housing is filled with hydrogen, the whole cooling process is guaranteed to be carried out in a hydrogen atmosphere, and the running speed of 1m/min is set on the discharging device and the receiving device, so that the ultrathin belt is uniformly cooled at the speed of 1 m/min.
4. After the cooling device is started, the ultrathin belt passes through the 1 st section, two gas injection parts are arranged on two sides of the flexible roller in the 1 st section, the flow speed of the injected hydrogen gas of the two gas injection parts is 5m/s, the inclination angle of the nozzle is 30 degrees, the cooling medium of the flexible roller is hot water at 70 ℃, and the pressure between the flexible rollers in the 1 st section is 230MPa.
5. The ultrathin strip was then passed through section 2, which was identical in structure to the first section, but with a flow rate of 12m/s of hydrogen gas injected from the two gas injection sections, an inclination angle of the nozzle of 25 °, a cooling medium for the flexible rolls of 24 ℃ cold water, and a roll-to-roll pressure of 200MPa for the 2 nd section flexible rolls.
6. The ultrathin strip finally passes through a 3 rd section, the 3 rd section has the same structure as the first section, but the flow rate of the hydrogen sprayed by the two gas spraying parts is 28m/s, the inclination angle of the nozzle is 20 degrees, the cooling medium of the flexible roller is liquid nitrogen at the temperature of minus 194 ℃, and the pressure between the flexible rollers of the 3 rd section is 180MPa.
7. And when the ultra-thin belt on the discharging device is completely cooled, the final temperature of the thin belt is 25 ℃, and the flexible roller jet composite sectional cooling device is closed. And taking down the cooled ultrathin belt on the material receiving device through a coiling machine, shearing off the material guiding belt at the front part of the welding, attaching a label, and collecting in a warehouse.
Example 3
Referring to fig. 1-2, a method for cooling Bao Daizu by contact with a flexible roller according to this embodiment is as follows:
1. rolling a 316 stainless steel ultrathin belt with the thickness of 0.05mm by an asynchronous reversible rolling mill, rolling the ultrathin belt on the curled side of the rolling mill by a coiling machine, placing the rolled ultrathin belt on a discharging device at the inlet end of a flexible roller jet composite sectional cooling device, taking a movable end welding guiding belt of the ultrathin belt, welding the guiding belt into a belt with the thickness of 1mm and the same steel type as the ultrathin belt needing cooling, connecting the guiding belt to a receiving device at the other side of the cooling device by penetrating the whole flexible roller jet composite sectional cooling device, and curling for more than two circles on the receiving device.
2. The ultrathin strip thickness of this time is 0.05 mm's 316 stainless steel, adopts 12 segmentation combination cooling, and first section flexible roller cooling medium is hot water, and second section flexible roller cooling medium is cold water, and third section flexible roller cooling medium is liquid nitrogen, before the installation flexible roller, needs to polish flexible roller device surface high accuracy, and flexible roller surface roughness after polishing is 35nm.
3. Simultaneously, the tension of the discharging device and the receiving device is set, so that the whole ultrathin strip is tensioned but not broken, and the receiving device is rotated to accurately stop the welding end of the ultrathin strip at the beginning of the first section of the cooling device. The flexible roller jet composite sectional cooling device is started, so that the device housing is filled with hydrogen, the whole cooling process is guaranteed to be carried out in a hydrogen atmosphere, and the running speed of 3m/min is set on the discharging device and the receiving device, so that the ultrathin belt is uniformly cooled at the speed of 3 m/min.
4. After the cooling device is started, the ultrathin belt passes through the sections 1, 2, 3 and 4, two sides of each flexible roller are respectively provided with a gas injection part, the flow rate of hydrogen injected by eight gas injection parts is 15m/s, the inclination angle of a nozzle is 18 degrees, the cooling medium of the flexible roller is hot water at 100 ℃, and the pressure among the flexible rollers in the sections 1, 2, 3 and 4 is 245MPa, 210MPa, 230MPa and 250MPa respectively.
5. The ultrathin strip then passes through sections 5, 6, 7 and 8, each of which has the same structure as section 1, but the eight gas injection sections inject hydrogen at a flow rate of 25m/s, the inclination angle of the nozzles is 15 °, the cooling medium of the flexible rolls is cold water at 25 ℃, and the roll-to-roll pressures of the flexible rolls of sections 5, 6, 7 and 8 are 250MPa, 200MPa, 210MPa and 230MPa, respectively.
6. The ultrathin belt finally passes through sections 9, 10, 11 and 12, the structure of the non-section is the same as that of the section 1, but the flow rate of the hydrogen sprayed by eight gas spraying parts is 10m/s, the inclination angle of a nozzle is 35 degrees, the cooling medium of the flexible roller is liquid nitrogen at the temperature of minus 197 ℃, and the pressure among the flexible rollers of the sections 9, 10, 11 and 12 is 230MPa, 200MPa, 170MPa and 150MPa respectively.
7. And when the ultra-thin belt on the discharging device is completely cooled, the final temperature of the thin belt is 35 ℃, and the flexible roller jet composite sectional cooling device is closed. And taking down the cooled ultrathin belt on the material receiving device through a coiling machine, shearing off the material guiding belt at the front part of the welding, attaching a label, and collecting in a warehouse.
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (4)
1. A Bao Daizu cooling method of a flexible roller contact type is characterized in that: for a thin belt with the thickness of 0.005-0.05 mm, cooling the thin belt to the end temperature of 25-35 ℃ by using a 3-12 section flexible roller cooling device, wherein gas spraying parts are arranged on the upper surface and the lower surface of the thin belt at the front part of each section of flexible roller cooling device, hydrogen is sprayed by the gas spraying parts, and the flow rate of the sprayed hydrogen is 2-30 m/s; the running speed of the thin belt in the flexible roller cooling device is 1-5 m/min; the pressure of the flexible roller to the thin belt is 20-250 MPa; wherein the cooling medium in the 3-12 sections of flexible roller cooling device is a section of hot water, b section of cold water and c section of liquid nitrogen in sequence, a, b and c are natural numbers, and a+b+c is equal to 3-12; the temperature of the hot water is 40-100 ℃, the temperature of the cold water is 10-25 ℃, and the temperature of the liquid nitrogen is lower than-190 ℃.
2. A method of Bao Daizu cooling a flexible roll contact according to claim 1, wherein: the gas spraying part is provided with a flat nozzle, and the angle adjustment range of the nozzle and the surface of the thin belt is 15-40 degrees.
3. A method of Bao Daizu cooling by flexible roller contact according to any one of claims 1 to 2, wherein: the surface roughness of the flexible roller is required to be 10-35 nm.
4. A method of Bao Daizu cooling a flexible roll contact according to claim 3, wherein: the thin belt is a stainless steel ultrathin belt, and the steel grade is 201, 304, 316 or 409.
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| CN202210407255.4A CN114669613B (en) | 2022-04-19 | 2022-04-19 | Flexible roller contact type Bao Daizu cooling method |
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| CN202210407255.4A CN114669613B (en) | 2022-04-19 | 2022-04-19 | Flexible roller contact type Bao Daizu cooling method |
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| CN114669613B true CN114669613B (en) | 2023-06-20 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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