CN116037652A - Cold continuous rolling process - Google Patents
Cold continuous rolling process Download PDFInfo
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- CN116037652A CN116037652A CN202310210322.8A CN202310210322A CN116037652A CN 116037652 A CN116037652 A CN 116037652A CN 202310210322 A CN202310210322 A CN 202310210322A CN 116037652 A CN116037652 A CN 116037652A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 81
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 258
- 239000010959 steel Substances 0.000 claims abstract description 258
- 238000000034 method Methods 0.000 claims abstract description 66
- 230000008569 process Effects 0.000 claims abstract description 61
- 238000003466 welding Methods 0.000 claims abstract description 55
- 238000009966 trimming Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 20
- 238000005507 spraying Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 239000013556 antirust agent Substances 0.000 claims abstract description 10
- 238000003860 storage Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 8
- 238000010008 shearing Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 5
- 230000002950 deficient Effects 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 2
- 238000005304 joining Methods 0.000 claims 1
- 239000002253 acid Substances 0.000 abstract description 35
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052742 iron Inorganic materials 0.000 abstract description 7
- 230000008929 regeneration Effects 0.000 abstract description 7
- 238000011069 regeneration method Methods 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 238000005406 washing Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 4
- 239000011259 mixed solution Substances 0.000 description 14
- 238000005554 pickling Methods 0.000 description 9
- 239000002699 waste material Substances 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 238000005097 cold rolling Methods 0.000 description 6
- 208000028659 discharge Diseases 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000003595 mist Substances 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000007602 hot air drying Methods 0.000 description 3
- 239000013072 incoming material Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- 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
- B21B45/04—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 de-scaling, e.g. by brushing
- B21B45/06—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 de-scaling, e.g. by brushing of strip material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0064—Uncoiling the rolled product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0092—Welding in the rolling direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a cold continuous rolling process, and relates to the technical field of strip steel production. The cold continuous rolling process comprises the following steps: welding steel coils to connect two adjacent steel coils into strip steel; stretching the welded strip steel along the sequential connection direction of the steel coil, and removing oxides on the surface of the stretched strip steel; removing an oxide layer on the surface of the strip steel in a physical mode of spraying mixed mortar on the surface of the strip steel, wherein the mixed mortar is mixed liquid of steel grit, water and a water-based antirust agent; trimming the strip steel to a preset width and rolling the strip steel to a preset thickness; and (5) coiling to prepare the coiled material. The process can achieve the purpose of removing the iron scales on the surface of the strip steel without acid liquor or acid regeneration treatment, avoids pollution to the environment caused by the acid washing process, omits investment of environmental protection equipment related to acid regeneration and acid washing emission treatment and corresponding maintenance and operation cost in the later period, has relatively simple process flow and equipment, has lower production cost per ton of steel, and greatly improves the market competitiveness of cold continuous rolling products.
Description
Technical Field
The invention relates to the technical field of strip steel production, in particular to a cold continuous rolling process.
Background
Cold continuous rolling refers to using hot rolled steel coil as raw material, washing with acid to remove oxide skin, rolling to obtain hard rolled steel coil. The cold-rolled product is widely applied to industries such as automobile manufacturing, household appliances, instrument switches, buildings, office furniture and the like.
At present, all acid tandem rolling units in the strip steel cold rolling market adopt an acid pickling process for derusting the surface of a hot rolled material, and emissions such as waste acid, waste water, acid mist and the like generated by the acid pickling process bring great pollution to the environment, and the acid pickling process is required to be equipped with relevant equipment such as acid regeneration, waste acid, waste water, acid mist treatment and the like, so that the investment and operation management cost are high. Under the increasingly serious environmental protection and environmental protection pressure, the development and popularization of the pickling process technology of the acid tandem rolling unit become more and more difficult, and the production of a new strip steel cold tandem rolling process technology is used for replacing the traditional acid tandem rolling process in the current market, accelerating the green development of the cold rolling industry, and is a necessary choice for realizing high-quality and sustainable development in the new era of the cold rolling industry.
Disclosure of Invention
The invention aims to provide a cold continuous rolling process, which aims to solve the technical problem that the cold continuous rolling process in the prior art has great environmental pollution.
Embodiments of the present invention are implemented as follows:
the embodiment of the invention provides a cold continuous rolling process, which comprises the following steps: welding steel coils to connect two adjacent steel coils into strip steel; stretching the welded strip steel along the sequential connection direction of the steel coil, and removing oxides on the surface of the stretched strip steel; removing an oxide layer on the surface of the strip steel in a physical mode of spraying mixed mortar on the surface of the strip steel, wherein the mixed mortar is mixed liquid of steel grit, water and a water-based antirust agent; trimming the strip steel to a preset width and rolling the strip steel to a preset thickness; and (5) coiling to prepare the coiled material.
In an alternative embodiment of the present invention, before welding the steel coils and connecting the two adjacent steel coils into the strip steel, the process further includes: uncoiling the steel coil; straightening the head and tail positions of the uncoiled steel coil; and cutting off defective parts of the head and tail of the straightened steel coil.
In an alternative embodiment of the present invention, the welding steel coils to connect two adjacent steel coils into a strip steel includes: stopping the welding area, welding the head and tail of two adjacent steel coils by using welding equipment, stopping storing the welded strip steel by using an inlet loop, and discharging the pre-stored strip steel; after the welding is finished, the inlet loop is punched to pre-store the welded strip steel.
In an alternative embodiment of the present invention, the welding device is a laser welding device.
In an alternative embodiment of the present invention, after the above-mentioned physical manner of spraying the mixed mortar on the surface of the strip steel to remove the oxide layer on the surface of the strip steel, the process further includes: and drying the strip steel after the oxide layer is removed.
In an alternative embodiment of the present invention, after the above-mentioned physical manner of spraying the mixed mortar on the surface of the strip steel to remove the oxide layer on the surface of the strip steel, the process further includes: and conveying the strip steel with the surface oxide layer removed to a first outlet loop for storage, discharging the stored strip steel by the first outlet loop, enabling the stored strip steel to enter a trimming area, stopping the trimming area, and trimming the edge of the strip steel by a trimming machine.
In an optional embodiment of the present invention, the trimming the strip to a preset width and rolling to a preset thickness further includes: trimming the strip steel to a preset width; conveying the strip steel subjected to edge shearing to a second outlet loop for storage, and discharging the stored strip steel by the second outlet loop to enable the stored strip steel to enter a continuous rolling mill; the continuous rolling mill rolls the strip steel to a preset thickness.
In an alternative embodiment of the present invention, the removing the oxide layer on the surface of the strip by spraying the mixed mortar on the surface of the strip includes: and driving the turbine blade to rotate by adopting a motor, and spraying the mixed liquid on the surface of the strip steel through the turbine blade.
In an alternative embodiment of the present invention, the uncoiling of the steel coil includes: and adopting a first uncoiler and a second uncoiler to sequentially and continuously uncoil the strip steel.
In alternative embodiments of the invention, the tandem rolling mill is a four-stand tandem rolling mill, a five-stand tandem rolling mill, or a six-stand tandem rolling mill.
The beneficial effects of the embodiment of the invention include:
the cold continuous rolling process provided by the embodiment of the invention comprises the following steps: welding steel coils to connect two adjacent steel coils into strip steel; stretching the welded strip steel along the sequential connection direction of the steel coil, and removing oxides on the surface of the stretched strip steel; removing an oxide layer on the surface of the strip steel in a physical mode of spraying mixed mortar on the surface of the strip steel, wherein the mixed mortar is mixed liquid of steel grit, water and a water-based antirust agent; trimming the strip steel to a preset width and rolling the strip steel to a preset thickness; and (5) coiling to prepare the coiled material. The process adopts the mixed solution without acid to spray on the surface of the strip steel to remove the oxide layer, replaces the pickling process in the cold continuous rolling process in the prior art, does not use acid liquor and does not need acid regeneration treatment, thereby achieving the purpose of removing the oxide scale on the surface of the strip steel, avoiding the pollution to the environment caused by the discharge of waste acid, waste water, acid mist and the like generated in the pickling process, and saving the investment of environmental protection equipment related to acid regeneration and pickling discharge treatment and the corresponding maintenance and operation cost in the later period. The mixed solution of the steel grit, the water and the water-based antirust agent has no corrosive medium, no hazardous waste, no waste treatment, no metal loss caused by corrosion, bright surface of the obtained strip steel, and the used mixed solution can be recycled. On the premise of ensuring the production efficiency and the process treatment quality, the cold continuous rolling process has the advantages of relatively simple process flow and equipment, lower production cost per ton of steel and greatly improved market competitiveness of cold continuous rolling products.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is one of the flowcharts of a cold continuous rolling process provided by an embodiment of the present invention;
FIG. 2 is a second flowchart of a cold continuous rolling process according to an embodiment of the present invention;
FIG. 3 is a third flowchart of a cold continuous rolling process according to an embodiment of the present invention;
FIG. 4 is a fourth flowchart of a cold continuous rolling process according to an embodiment of the present invention;
FIG. 5 is a fifth flowchart of a cold continuous rolling process according to an embodiment of the present invention;
FIG. 6 is a flowchart of a cold continuous rolling process according to an embodiment of the present invention;
FIG. 7 is a flow chart of a cold continuous rolling process according to an embodiment of the present invention;
fig. 8 is a flowchart of a cold continuous rolling process according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "medium", "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
Referring to fig. 1, the present embodiment provides a cold continuous rolling process, including:
s130: and welding steel coils to connect two adjacent steel coils into strip steel.
And welding the tail parts and the head parts of the front steel coil and the rear steel coil meeting the welding requirements by adopting welding equipment to form continuous strip steel.
S140: stretching the welded strip steel along the sequential connection direction of the steel coil, and removing oxides on the surface of the stretched strip steel.
The steel coil used for welding is subjected to hot rolling treatment before welding, and a layer of iron oxide scale is formed on the surface of the steel coil, and the quality of the welded steel strip is seriously affected by the layer of iron oxide scale, so that the iron oxide scale on the surface of the steel strip needs to be removed after welding.
Specifically, the stretching process parameters are set according to the material specification of the incoming material, the welded strip steel is stretched, so that the flatness and the plate shape quality of the welded strip steel are improved, and oxides on the surface of the welded strip steel are removed through stretching, so that preparation is made for the subsequent process.
S140, repeatedly stretching by using a mechanical process according to the property difference of the steel strip and the iron scale coating material, generating certain elastoplastic deformation after the steel strip is stressed, wherein the iron scale on the surface of the steel strip has no plasticity and low damage strength, and has poor adhesion with the steel strip, so that when the internal stress caused by the fact that the iron scale cannot adapt to the change of the metal shape is larger than the damage strength, the iron scale is broken, and finally, the iron scale in different forms is peeled off.
S150: and (3) removing an oxide layer on the surface of the strip steel in a physical mode of spraying mixed mortar on the surface of the strip steel, wherein the mixed mortar is mixed liquid of steel sand, water and a water-based antirust agent.
In general, the oxides on the surface of the strip steel are divided into an outer layer, a middle layer and an inner layer, and the adhesion force of the outside-in oxides to the matrix is gradually enhanced. The process S140 can remove only the oxide having the smaller adhesion between the outer layer and the middle layer, but the oxide having the larger adhesion between the inner layer cannot be removed through the process S140. Therefore, after the process S140, it is also necessary to spray a mixed solution of steel grit, water and a water-based rust inhibitor onto the surface of the strip steel to remove the oxide having the greatest adhesion of the inner layer.
In the mixed solution, water is a conveying medium of steel grit and a water-based antirust agent, the steel grit is mainly used for removing oxides on the surface of the strip steel, and the water-based antirust agent can prevent the strip steel from being rusted again after contacting the mixed solution, thereby affecting the appearance and the performance of the strip steel. The grain size of the steel grit is mainly determined by the roughness of the surface of the strip steel to be obtained, and if the roughness value of the surface of the strip steel to be obtained is larger, namely the surface of the strip steel to be obtained is rougher, the steel grit with larger grain size can be selected to remove the oxide on the surface of the strip steel; if the roughness value of the surface of the strip steel to be obtained is smaller, namely the surface of the strip steel to be obtained is smoother, the oxide on the surface of the strip steel can be removed by selecting the steel grit with smaller grain size.
In the process S150, the acid pickling process which is indispensable for the cold continuous rolling process in the prior art is omitted, and the principle of physical rust removal is utilized, and the mixed solution which does not contain acid is sprayed on the surface of the strip steel to remove the oxide layer, so that the acid pickling process in the cold continuous rolling process in the prior art is replaced. The process S150 can achieve the purpose of removing the iron scales on the surface of the strip steel without acid liquor or acid regeneration treatment, avoids the pollution to the environment caused by the discharge of waste acid, waste water, acid mist and the like generated in the acid washing process, and omits the investment of environmental protection equipment related to acid regeneration and acid washing discharge treatment and the corresponding maintenance and operation cost in the later period. The mixed solution of the steel grit, the water and the water-based antirust agent has no corrosive medium, no dangerous waste, no waste treatment, no metal loss caused by corrosion, bright, clean and uniform surface of the obtained strip steel, and the used mixed solution can be recycled, so that the material cost and the maintenance cost of equipment are low.
S180: and trimming the strip steel to a preset width and rolling the strip steel to a preset thickness.
The edge shearing machine performs edge shearing treatment on the strip steel, eliminates the edge defect of the strip steel, and simultaneously performs size shearing according to the width requirement of a subsequent unit so as to ensure the stable and high-speed operation of the subsequent process. And (3) rolling the strip steel into a certain thickness according to the finished product requirement of the strip steel by passing the strip steel through a continuous rolling mill after edge shearing.
S190: and (5) coiling to prepare the coiled material.
The rolled strip steel is manufactured into coiled materials with certain inner coil size by utilizing coiling equipment, so that the rolling efficiency and the product quality of cold continuous rolling are improved, and the cold continuous rolling device is convenient to transport and store.
The production efficiency and the process treatment quality of the cold continuous rolling process are equivalent to those of the acid continuous rolling process in the prior art, but the process flow and the equipment of the cold continuous rolling process are relatively simple, the production cost of ton steel is lower than that of the acid continuous rolling process, and the market competitiveness of cold continuous rolling products is greatly improved.
Optionally, S150: the physical mode of spraying mixed mortar on the surface of the strip steel to remove the oxide layer on the surface of the strip steel comprises the following steps:
s151: and driving the turbine blade to rotate by adopting a motor, and spraying the mixed liquid on the surface of the strip steel through the turbine blade.
The turbine blades are arranged in the mixed liquid, the turbine blades rotate at a high speed to pressurize the mixed liquid, and then the mixed liquid is sprayed on the surface of the strip steel.
Referring to fig. 2, optionally, at S130: before welding the steel coils to connect the two adjacent steel coils into the strip steel, the process further comprises:
s100: and uncoiling the steel coil.
And (3) placing the steel coil on an uncoiler, continuously uncoiling the steel coil, and continuously providing raw materials for subsequent procedures.
S110: and straightening the head and tail positions of the uncoiled steel coil.
Straightening the head and tail parts of the uncoiled steel coil, improving the flatness of the head and tail parts of the steel coil, and enabling the strip threading in the subsequent process to be smooth.
S120: and cutting off defective parts of the head and tail of the straightened steel coil.
And cutting off defective parts of the straightened steel coil according to the head and tail parts of the straightened steel coil and the process requirements so as to ensure the subsequent welding quality and the stable operation of the strip steel in a unit.
Optionally, S100: uncoiling the steel coil comprises the following steps:
s101: and adopting a first uncoiler and a second uncoiler to sequentially and continuously uncoil the steel coil.
When the steel coil of the first uncoiler is used up and feeding is needed, the second uncoiler takes over the first uncoiler to continue feeding; when the steel coil of the second uncoiler is used up and needs to be fed, the first uncoiler finishes feeding, and the second uncoiler is replaced to continue feeding, so that continuous steel coils are provided for subsequent working procedures.
Referring to fig. 3, optionally, S130: welding the steel coils to connect two adjacent steel coils into strip steel comprises:
s131: and stopping the welding area, welding the head and tail of two adjacent steel coils by using welding equipment, stopping storing the welded strip steel by using an inlet loop, and discharging the pre-stored strip steel.
The loop is an essential device for ensuring continuous and automatic production of the steel plate, and plays a role in ensuring continuous work of the storage, the feeding and the host. In the production processes of cold rolling, coating and heat treatment of the sheet material, the storage of incoming materials is realized through the loop.
In the process S131, the welding area stops conveying the steel coils, the welding equipment located in the welding area welds two adjacent steel coils, and the tail of the former steel coil and the head of the latter steel coil are welded together to obtain the strip steel. The inlet loop is positioned behind the welding equipment, and the inlet loop stops storing strip steel when the steel coil is welded; meanwhile, in order to ensure continuous and stable operation of the subsequent process, the inlet loop enters a loop placing operation, namely, the inlet loop discharges pre-stored welded strip steel and is used for providing raw materials for the subsequent process. The process S131 uses the time gap of the inlet loop for storing the incoming material to realize the continuous operation of the whole process.
S132: after the welding is finished, the inlet loop is punched to pre-store the welded strip steel.
During welding, the inlet loop stops storing the strip steel, so as to ensure that the strip steel pre-stored in the inlet loop is discharged for providing raw materials for the subsequent process after the subsequent process is performed, and the strip steel stored in the inlet loop is consumed in the process, so that after the welding is completed, the inlet loop is punched, that is, the strip steel just welded is quickly fed into the inlet loop for storage, and the raw materials are provided for the subsequent process when the strip steel is welded next time, so that the subsequent process is ensured not to be suspended due to welding.
Alternatively, the welding device is a laser welding device.
The laser welding is a high-efficiency precise welding process which uses a laser beam with high energy density as a heat source, the welding process belongs to heat conduction type, namely, the surface heat is diffused to the inside through heat conduction, and the workpiece is melted by controlling parameters such as the width, the energy, the peak power, the repetition frequency and the like of laser pulses, so that a specific molten pool is formed.
In the cold continuous rolling process, the tail part of the preceding steel coil and the head part of the following steel coil are welded to form a welding line, and then the welding line passes through a rolling line to form continuous rolling, so that the production efficiency is improved; the laser welding has high welding quality, no contact, large depth-to-width ratio, small deformation, beautiful welding and basically consistent mechanical property with the base metal, so that the laser welding equipment is adopted to weld the steel coil to obtain continuous strip steel.
Referring to fig. 4, optionally, S150: after the oxide layer on the surface of the strip steel is removed by spraying the mixed mortar on the surface of the strip steel in a physical mode, the process further comprises the following steps:
s160: and drying the strip steel after the oxide layer is removed.
When the mixed solution of steel grit, water and water-based antirust agent is used for removing oxides, a part of the mixed solution remains on the surface of the strip steel after contacting the surface of the strip steel. Although the water-based rust inhibitor can prevent the surface of the strip steel from being rusted, the remaining mixed solution can pollute equipment and solutions in subsequent processes. Therefore, the strip after removal of the oxide layer needs to be dried.
Optionally, a hot air drying device is adopted to eliminate the residual mixed solution on the surface of the strip steel.
The hot air drying is also called instant drying, which is to make the heating medium (air, inert gas, gas waste gas or other hot gas) directly contact with the object to be dried and make the object to be dried float in the heating medium, so that the contact area of the two phases is large, and the heat transfer process is strengthened. Therefore, a hot air drying device is adopted to eliminate the residual mixed solution on the surface of the strip steel at the outlet of the process section, and the pollution of the residue of the process section to equipment and solution in the subsequent working procedures is reduced.
Referring to fig. 5, optionally, S150: after the oxide layer on the surface of the strip steel is removed by spraying the mixed mortar on the surface of the strip steel in a physical mode, the process further comprises the following steps:
s170: and conveying the strip steel with the surface oxide layer removed to a first outlet loop for storage, discharging the stored strip steel by the first outlet loop, enabling the stored strip steel to enter a trimming area, stopping the trimming area, and trimming the edge of the strip steel by a trimming machine.
In S170, after the strip enters the trimming area, the strip needs to stay inside the trimming machine to trim the edges, and at this time, the first outlet loop needs to stop releasing the strip to the trimming machine. However, the strip steel is still continuously generated in the preamble process, so that in order to avoid the influence of edge trimming on the preamble process, the strip steel with the surface oxide layer removed is firstly stored in the first outlet loop, and after edge trimming is finished, the strip steel is released by the first outlet loop and enters the subsequent process. The arrangement of the first outlet loop enables the preface working procedure to be continuously and stably carried out when the strip steel is cut, and the strip steel is not stopped due to edge cutting operation.
In the foregoing description, after the oxide layer on the surface of the strip steel is removed by spraying the mixed mortar on the surface of the strip steel, the strip steel after the oxide layer is removed may also be dried. Referring to fig. 6, if the process S160 and the process S170 exist at the same time, the process S160 is first performed, and then the process S170 is performed.
Referring to fig. 7, optionally, S180: trimming the strip steel to a preset width and rolling the strip steel to a preset thickness further comprises:
s181: and trimming the strip steel to a preset width.
S182: and conveying the strip steel subjected to edge shearing to a second outlet loop for storage, and discharging the stored strip steel by the second outlet loop so that the stored strip steel enters the continuous rolling mill.
In S182, after the strip steel enters the tandem mill, the tandem mill is decelerated during slitting of the tandem mill, and at this time, continuous strip steel is still produced in the preceding process, so in order to avoid the influence of the tandem mill deceleration on the preceding process, the second outlet loop is sleeved and conveys the strip steel to the tandem mill slowly, after slitting is completed, the tandem mill is accelerated to a normal rolling speed, the second outlet loop starts to be sleeved and conveys the strip steel to the tandem mill, thereby ensuring that the production process is continuously and stably performed. The second outlet looper is arranged so that the pre-working procedure can still be continuously and stably carried out when the strip steel is rolled, and the strip steel cannot be stopped due to rolling operation.
S183: the continuous rolling mill rolls the strip steel to a preset thickness.
Alternatively, the tandem mill is a four-stand tandem mill, a five-stand tandem mill or a six-stand tandem mill.
Cold rolling is one of the most important processes in the production of cold continuous rolled strip steel. The continuous rolling mill is main equipment for cold rolling production. The multi-frame continuous rolling mill has high rigidity and small work roll winding degree. The working roller is made of materials with high elastic modulus, can bear high rolling pressure and is provided with a perfect roller shape adjusting system, so that the multi-frame continuous rolling mill can roll extremely thin strip steel, silicon steel and stainless steel which are difficult to deform and high-strength chromium-nickel alloy materials. The variety of the tandem mill can be reasonably selected by a person skilled in the art according to actual requirements.
Note that, if the above steps are simultaneously present, or alternatively present, referring to fig. 8, in the process of the cold continuous rolling process, in S131: the welding area is stopped, the welding equipment welds the head and the tail of two adjacent steel coils, and after the inlet loop stops storing the welded strip steel and discharges the pre-stored strip steel, S132: after the welding is completed, the inlet loop is punched to pre-store the welded strip steel and S140: stretching the welded strip steel along the sequential connection direction of the strip steel, and removing oxides on the surface of the stretched strip steel can be synchronously performed. That is, the inlet loop can be punched while removing oxides on the surface of the strip steel, and the welded strip steel is stored.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A cold continuous rolling process, comprising:
welding steel coils, and connecting two adjacent steel coils into strip steel;
stretching the welded strip steel along the sequential connection direction of the steel coil, and removing oxides on the surface of the stretched strip steel;
removing an oxide layer on the surface of the strip steel in a physical mode of spraying mixed mortar on the surface of the strip steel, wherein the mixed mortar is mixed liquid of steel sand, water and a water-based antirust agent;
trimming the strip steel to a preset width and rolling the strip steel to a preset thickness;
and (5) coiling to prepare the coiled material.
2. The cold continuous rolling process of claim 1, wherein prior to said welding coils, joining adjacent two of said coils into strip, said process further comprises:
uncoiling the steel coil;
straightening the head and tail positions of the uncoiled steel coil;
and cutting off defective parts of the head and tail of the straightened steel coil.
3. The cold continuous rolling process according to claim 1 or 2, wherein said welding steel coils, connecting adjacent two of said steel coils into strip steel, comprises:
stopping the welding area, welding the head and tail of two adjacent steel coils by using welding equipment, stopping storing the welded strip steel by using an inlet loop, and discharging the pre-stored strip steel;
after the welding is finished, the inlet loop is punched to pre-store the welded strip steel.
4. A cold continuous rolling process according to claim 3, wherein the welding device is a laser welding device.
5. The cold continuous rolling process according to claim 1, wherein after the oxide layer on the strip surface is removed by spraying mixed mortar on the strip surface, the process further comprises:
and drying the strip steel after the oxide layer is removed.
6. The cold continuous rolling process according to claim 1 or 5, wherein after the oxide layer on the surface of the strip is physically removed by spraying mixed mortar on the surface of the strip, the process further comprises:
and conveying the strip steel with the surface oxide layer removed to a first outlet loop for storage, wherein the first outlet loop discharges the stored strip steel, so that the stored strip steel enters a trimming area, the trimming area is stopped, and a trimming machine trims the edge of the strip steel.
7. The cold continuous rolling process of claim 1, wherein trimming the strip to a predetermined width and rolling to a predetermined thickness further comprises:
trimming the strip steel to a preset width;
conveying the strip steel subjected to edge shearing to a second outlet loop for storage, and discharging the stored strip steel by the second outlet loop to enable the stored strip steel to enter a continuous rolling mill;
the tandem mill rolls the strip steel to a preset thickness.
8. The cold continuous rolling process according to claim 1, wherein the physical means for removing the oxide layer on the surface of the strip by spraying the mixed mortar on the surface of the strip comprises:
and driving a turbine blade to rotate by adopting a motor, and spraying the mixed liquid on the surface of the strip steel through the turbine blade.
9. The cold continuous rolling process of claim 2, wherein the uncoiling the coil of steel comprises:
and adopting a first uncoiler and a second uncoiler to uncoil the strip steel continuously in sequence.
10. The cold continuous rolling process of claim 7, wherein the continuous rolling mill is a four-stand continuous rolling mill, a five-stand continuous rolling mill, or a six-stand continuous rolling mill.
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