CN116571584A - Metal plate strip acid-less descaling process - Google Patents
Metal plate strip acid-less descaling process Download PDFInfo
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- CN116571584A CN116571584A CN202310599761.2A CN202310599761A CN116571584A CN 116571584 A CN116571584 A CN 116571584A CN 202310599761 A CN202310599761 A CN 202310599761A CN 116571584 A CN116571584 A CN 116571584A
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- 238000000034 method Methods 0.000 title claims abstract description 82
- 230000008569 process Effects 0.000 title claims abstract description 65
- 239000002184 metal Substances 0.000 title claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 107
- 239000010959 steel Substances 0.000 claims abstract description 107
- 230000001680 brushing effect Effects 0.000 claims abstract description 21
- 238000005554 pickling Methods 0.000 claims abstract description 21
- 239000002253 acid Substances 0.000 claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 12
- 238000000227 grinding Methods 0.000 claims abstract description 8
- 238000005422 blasting Methods 0.000 claims abstract description 7
- 238000005336 cracking Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 230000009471 action Effects 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- 238000011010 flushing procedure Methods 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 claims description 8
- 229910052593 corundum Inorganic materials 0.000 claims description 7
- 239000010431 corundum Substances 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 7
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 5
- 239000008235 industrial water Substances 0.000 claims description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 238000005201 scrubbing Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 229910052580 B4C Inorganic materials 0.000 claims description 2
- 150000007513 acids Chemical class 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 238000010009 beating Methods 0.000 claims description 2
- 229910021418 black silicon Inorganic materials 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims description 2
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000498 cooling water Substances 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims description 2
- 238000005538 encapsulation Methods 0.000 claims description 2
- 239000003595 mist Substances 0.000 claims description 2
- 238000010926 purge Methods 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- 238000009991 scouring Methods 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 210000004027 cell Anatomy 0.000 claims 1
- 210000005056 cell body Anatomy 0.000 claims 1
- 239000008188 pellet Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 229910000976 Electrical steel Inorganic materials 0.000 abstract description 4
- 238000005097 cold rolling Methods 0.000 abstract description 4
- 208000010392 Bone Fractures Diseases 0.000 abstract description 2
- 206010017076 Fracture Diseases 0.000 abstract description 2
- 229910000677 High-carbon steel Inorganic materials 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 description 5
- 239000003082 abrasive agent Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 244000185238 Lophostemon confertus Species 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
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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
- B21B45/04—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
- 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
- B21B45/08—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 hydraulically
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a metal plate strip acid-less descaling process, which comprises at least one set of preposed pre-descaling unit, a set of brush roller system and a tank body for chemical pickling, wherein the preposed pre-descaling unit is used for realizing the first removal and scale cracking of scales on the upper and lower surfaces of the metal plate strip and improving the roughness of a plate surface in a mode of leaving a large number of pits. The invention has wide application prospect in the field of cold rolling production, adopts a mixed jet process to replace dry shot blasting, eliminates a straightening and descaling mode, can effectively solve the fracture risk of brittle steel plates (such as high-grade silicon steel, high-carbon steel and the like), and achieves that the surface scale residue rate before entering an acid tank is low enough through grinding and descaling of a mixed jet with high roughness and a series brushing system.
Description
Technical Field
The invention belongs to the technical field of physical descaling of a metal plate and strip, and particularly relates to a metal plate and strip acid-less descaling process.
Background
The method is mainly used for realizing physical descaling of the cold-state hard metal strip, simultaneously ensuring that the residual rate of scale on the front and back surfaces of the metal strip after descaling is low enough, obviously reducing the descaling load of subsequent pickling, achieving the aim of reducing acid consumption and improving productivity, and is the invention and the creation of a low-acid descaling technology related to the surface treatment technology of the cold-state metal strip, wherein a metal material forms a layer of compact covering consisting of metal oxides on the surface in the hot rolling or heat treatment process, and the existence of the scale can negatively influence the further processing treatment: on one hand, the surface cracks of the material are not easy to find, so that various quality defects exist in the processed finished product; on the other hand, the scale is easy to be pressed into the metal surface, so that the appearance quality problems such as surface pits, pits and the like are caused; in addition, hard oxides can accelerate wear of rolls, abrasives, and the like.
In order to remove scale, chemical wet process is mainly adopted by domestic and foreign manufacturers to remove scale. For steel coils, a strongly acidic solution such as sulfuric acid, hydrochloric acid, hydrofluoric acid, nitric acid or hydrogen peroxide is generally used. The chemical wet pickling is very bad in mass production environment, and a large amount of residual acid generated by production must be subjected to cyclic regeneration treatment, SO that the corresponding exhaust emission is necessarily generated by the existing regeneration technology, and the exhaust contains a large amount of acidic and corrosive components such as HCL, SO2 and the like, SO that the atmosphere is directly polluted.
Based on the above, in order to solve the serious environmental pollution problem caused by the cleaning of the chemical method, scientific researchers have made a great deal of researches and developed various technologies and devices to replace the descaling method of the chemical method for removing the scale on the metal surface, such as withdrawal and straightening descaling, shot blasting pre-descaling, laser descaling, jet descaling and the descaling method of the combination of the above different methods.
Korean pu (see patent US2011097973 A1) 2009 discloses a method of dry blasting in series after withdrawal and straightening, and then scale removal is achieved by a combination of flattening and brushing rolls; and reports that the process sequence of the three steps of flattening and calendaring, dry shot blasting and brush roller can be flexibly changed according to the process requirement of the production line. However, the process cannot be suitable for descaling of brittle metal coils with high carbon and high silicon, and the edges of the strip steel are easy to crack after being pulled and straightened, so that the strip is extremely easy to break during stable production, and the production is interrupted; then, in 2011, a descaling process (see patent KR 20130064616A) is disclosed again in which slurry jet is connected in series after a withdrawal and straightening breaker, but the withdrawal and straightening requirement on the toughness of the metal plate is clear, so that brittle metal coiled bands such as high carbon, high silicon and the like cannot be met.
The american TMW corporation in 2005 disclosed an SCS process for brushing strip steel with water (see patent US 7077724), which uses an independent unwind unit, and uses two pairs of brush rolls to brush in the same direction, achieving the goal of pretreatment. The same direction brushing technique can only be used independently, and if the technique is embedded in a continuous unit, the tension is easy to cause uncontrollable result. For this purpose, this solution can only be used as a pre-descaling in the rewinding mode and cannot be connected in series in the pickling line.
In addition, china Zhang Liuzhu discloses such a combined brush roll apparatus in 2015, but there is no detailed discussion of how the apparatus can be used in a continuous train.
It has also been found that foreign metallurgical technology is developed in countries, which, although numerous continuous jet and brush descaling techniques such as JP06108277a disclose a descaling process using a combination of spray acid and brush rolls in a continuous cold rolling line, JP55034688A discloses a combined PV rolling descaling-mixed abrasive high pressure jet descaling method, JP57142710A, JP57068217a, JP59097711a, and TMW corporation in canada have disclosed a series of descaling techniques for the surface of steel sheet, US20080108281 (A1), US20080182486 (A1), and US20090227184 (A1), etc., since 2001, and western european patent US5388602, JP05092231A, JP09085329a, JP2002102915, etc., have not proposed a technique for effectively treating the surface of a brittle metal sheet.
Based on the above, the novel descaling process is disclosed for the purpose of low-acid and high-efficiency descaling of hot rolled steel coils with poor toughness and high brittleness such as high carbon and high silicon, and realizes the descaling processing of the metal coils, thereby achieving the aim of improving the descaling speed and simultaneously realizing low-acid.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a metal plate strip acid-free descaling process which can overcome the problems or at least partially solve the problems.
The invention is realized in such a way that the metal plate strip acid-less descaling process comprises at least one set of preposed pre-descaling unit, one set of brush roller system and a chemically pickled tank body, wherein the preposed pre-descaling unit is used for realizing the first removal and the scale cracking of the upper and lower surface scales of the metal plate strip, and the roughness of the plate surface is improved in a mode of leaving a large number of pits, the chemically pickled tank body is used for chemically soaking the strip steel with a small amount of residual scale, removing the small amount of residual scale finally to obtain the final required qualified finished product, the brush roller system comprises two pairs of externally arranged squeezing rollers and two sets of brush roller systems, and the surface of the strip steel with high roughness is physically brushed to realize the further removal of the residual scale, and the scale residue rate of the surface of the strip steel is further reduced.
The metal plate strip (the metal plate strip with the temperature not higher than the temperature) runs to the front pre-descaling unit through a plate, the scale is broken and removed for the first time through the mixed jet of the pre-descaling unit, and a large number of tiny striking pits are reserved on the surface of the strip steel. At the moment, the strip steel is cleaned by a flushing box body, and the abrasive on the surface of the strip steel is completely removed, so that the aim of only residual water is fulfilled.
The strip steel enters the brushing system, the strip steel firstly enters an inlet squeezing roll gap of the brushing box body, the surface elevation of the strip steel is guaranteed to be matched with the process height, the strip steel stably enters a first pair of brushing rolls and then passes through the roll gap of an outlet squeezing roll, the process height of the strip steel is finally guaranteed to be always kept within the process height range, and when the two pairs of brushing rolls/pressing rolls start to grind, the process height of the strip steel is still kept within the process height range under the action of front-back tension and is not out of tolerance.
After passing through the dewatering and wringing roller, the strip steel is mostly removed with the surface residual water, only trace water film on the surface is remained, and then the strip steel enters the subsequent acid tank after being subjected to surface drying through the drying system, so as to realize the final scale removal of the metal strip.
The specific descaling mode of the pre-descaling unit can be particularly indicated as high-speed spraying and beating of an aqueous solution (commonly called slurry) mixed with abrasive particles, the process is obviously different from a dry shot blasting and straightening process, the water quality standard of water contained in the slurry adopted by the pre-descaling system is normal-temperature industrial clean circulating water, and the specific details are as follows: the temperature is below the temperature and the value is below the maximum particle size of the hard particles.
The concrete details of the sand-shaped hard particles mixed in the slurry adopted in the pre-descaling system can comprise natural corundum abrasive materials (such as brown corundum, white corundum, single-crystal corundum and the like), carbide abrasive materials (such as black silicon carbide, green silicon carbide, boron carbide and the like), steel shots, steel wire shot cuts and other metal processing shots.
The flushing unit is in a water flushing mode, the water body is circulating water of the pre-descaling unit, and can also be common industrial water, such as industrial water purification, fire water and the like, the water removal squeezing roller is an encapsulation roller body of a steel roller surface, and the roller surface hardness is generally between Shore values; the drying unit is an air purging system with the temperature exceeding the temperature, so that the residual water film on the surface of the plate is removed and dried, and the pickling system is a tank body containing pickling solution with certain concentration and certain temperature, wherein the pickling solution can be sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, hydrogen peroxide, various mixed acids and the like.
The brushing system comprises the following specific modes: the rotary roller body with brush wires is directly contacted with the metal plate belt for grinding, and simultaneously, cooling water is continuously sprayed; typically comprising four process devices, an inlet wringing roll, a first pair of brush rolls, a second pair of brush rolls, and an outlet wringing roll. Wherein, the brush roller rotation directions of the first pair of brush rollers and the second pair of brush rollers are opposite, and the aim is to generate tension force to the scouring rollers; the inlet squeezing roller and the outlet squeezing roller are rubber covered rollers, so that the purpose of effectively blocking water mist, jet splash and the like generated during scrubbing can be achieved while strip steel is clamped.
Compared with the prior art, the invention has the following beneficial effects:
the invention fully utilizes the combined action of the mixed jet descaling and the grinding and brushing system, and removes the withdrawal straightening and descaling, thereby realizing the pre-descaling high-efficiency treatment of the brittle sheet metal and achieving the aim of low-acid and high-efficiency descaling. As the technology adopted by the patent is mature, the technology can be implemented, and the popularization and the application are completely feasible. On the other hand, this patent can be fine adaptation company to the environmental protection requirement of metallurgical production and further promote the requirement of product competitiveness, improves the energy saving and emission reduction's of metallurgical enterprise ability. Therefore, the invention has wide application prospect in the cold rolling production field, adopts a mixed jet process to replace dry shot blasting, eliminates a straightening and descaling mode, can effectively solve the fracture risk of brittle steel plates (such as high-grade silicon steel, high-carbon steel and the like), and achieves that the surface scale residue rate before entering an acid tank is low enough through grinding and descaling of a mixed jet and a series brushing system.
Drawings
FIG. 1 is a schematic diagram of a low acid scale removal process provided by an embodiment of the present invention;
FIG. 2 is a layout of a strip steel treatment process provided by an embodiment of the invention;
FIG. 3 is a layout of a silicon steel treatment process provided by an embodiment of the present invention;
FIG. 4 is a layout diagram of a phosphorus breaking treatment process provided by an embodiment of the invention;
FIG. 5 is a comparative graph comparing conventional descaling processes provided in accordance with an embodiment of the present invention.
Detailed Description
For a further understanding of the present invention, its objects, features and advantages, reference should be made to the following examples which are illustrated in the accompanying drawings.
The structure of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 5, the steel billet provided by the embodiment of the invention is coiled after being coiled and rolled by a hot rolling mill, and then is subjected to descaling before entering the processes of cold rolling, hot plating, stamping and the like. At this time, the continuous treatment of head-tail welding of the steel coil 1 is realized under the action of the front-end equipment of the production line, namely, the steel plate becomes a continuous steel plate 1 with infinite length before entering the pre-descaling system 13, the temperature is not higher than 200 ℃, the steel plate runs to the pre-descaling system 13 along a roller way under the action of the tension of the machine set before and after the production line, at this time, a transmitter 13a in the system 13 starts to spray mixed jet 13b with 5bar of pressure and containing abrasive particles with the mass ratio exceeding 50%, and the transmitter 13a realizes uniform distribution of jet intensity of the steel plate 1 through multi-pass parity or dislocation arrangement (according to the width of the steel plate), so that the surface of the strip steel 1 realizes uniform peeling and loosening of scales.
The strip steel 3a2 with the cracked scale sequentially enters the water flushing unit 14 to flush and remove all abrasive particles and scale powder on the surface of the plate surface 3a2, and only water is remained on the plate surface 3a 2.
In this way, the strip 3b2 is fed from the flushing system 14 into the brushing system 15. The roll gap of the squeezing roll 15a1 is opened in advance (the whole continuous or push-pull type is considered as a unit, and the whole continuous is not required to be opened), so that the belt head or the welding seam can pass smoothly; then, the strip steel 3b2 firstly enters the roll gap of the inlet wringing roller 15a1 of the brush box body 15, the surface elevation of the strip steel 3b2 is consistent with the process height under the lifting of the wringing roller 15a1, the strip steel stably enters the first pair of brush rollers 15b1 and the second pair of brush rollers 15b2, then the strip steel passes through the roll gap of the outlet wringing roller 15a2, finally, the process height of the strip steel 3b2 is always ensured to be kept within the process height range, and when the two pairs of brush rollers 15b1/15b2 are pressed down and grinding is started, the process height of the strip steel 3b2 is still kept within the process height range under the action of front and back tension, and no deviation is caused. Wherein the first pair of brush rolls 15b1, the upper and lower roll bodies rotate relatively, the brush filaments in the contact area with the plate surface 3b2 all move towards the inlet direction of the strip steel; in the second pair of brush rolls 15b2, the upper and lower roll bodies are also rotated relatively, and the brush filaments in the contact area of the plate surface 3b2 are all moved toward the strip outlet direction. And the rotation speed and the rolling reduction of the two pairs of brush rolls 15b1/15b2 are equal.
The strip steel 3c2 treated in this way enters a squeezing unit 16 and a drying system 17, so that no obvious water stain is left on the surface of the steel plate 3d2, the treated strip steel 3d2 sequentially enters a pickling system 12, further cleaning of trace scale residues on the surface of the strip steel 3d2 is realized based on the chemical action of pickling, and the strip steel with the surface quality required by the post-process is produced, so that the process target is completed.
Embodiment two:
referring to fig. 2, after the strip steel 1 is uncoiled by an uncoiling unit, the strip steel enters a pre-descaling system 13 in sequence, and the strip steel 3a2 after being hit by mixed jet flow is subjected to surface scale removal, a large number of tiny pits are left, and the surface roughness is large; the strip steel 3a2 after being treated in this way sequentially enters a flushing section 14, the surface of the plate surface 3b2 is free of abrasive materials, and only water is remained; after entering the dewatering and squeezing device 16 and the drying device 17, the plate surface is anhydrous and abrasive-free, but the residual scale is partially removed, and then enters the pickling system 12 to completely remove the residual scale, so that the process target is achieved.
Embodiment III:
referring to fig. 3, for a part of the grades of silicon steel, because of the inherent brittleness, the scale cannot be broken by withdrawal straightening or multi-roll straightening, and the scale tissue remaining in the innermost layer in the oxide layer is not easy to dissolve in hydrochloric acid, while other scale tissues are typical Fe oxides, so that the hydrochloric acid is very convenient to process. For this reason, according to the third embodiment, such problems can be effectively solved: when the steel plate 1 enters the pre-descaling system 13, the emitter 13a in the system 13 starts to spray mixed jet flow 13b with the pressure of 5bar and containing steel sand with the mass ratio of more than 50%, and the surface of the strip steel 1 realizes uniform peeling and loosening of scale; the strip steel 3a2 with the cracked scale sequentially enters the water flushing unit 14 to flush and remove all abrasive particles and scale powder on the surface of the plate surface 3a2, and only water is remained on the plate surface 3c 3; then, the strip steel 3b2 firstly enters the roll gap of the inlet wringing roller 15a1 of the brush box body 15, the surface elevation of the strip steel 3b2 is consistent with the process height under the lifting of the wringing roller 15a1, the strip steel stably enters the first pair of brush rollers 15b1 and the second pair of brush rollers 15b2, and then the strip steel passes through the roll gap of the outlet wringing roller 15a2, so that the process height of the strip steel 3c3 is always ensured to be kept within the process height range; wherein the first pair of brush rolls 15b1, the upper and lower roll bodies rotate relatively, the brush filaments in the contact area with the plate surface 3b2 all move towards the inlet direction of the strip steel; in the second pair of brush rolls 15b2, the upper and lower roll bodies are also rotated relatively, and the brush filaments in the contact area of the plate surface 3b2 are all moved toward the strip outlet direction. And the rotation speed and the rolling reduction of the two pairs of brush rolls 15b1/15b2 are equal. The strip steel 3c3 after being treated in this way enters a squeezing unit 16 and a drying system 17, so that no obvious water stain is left on the surface of the steel plate 3d4, the treated strip steel 3d2 sequentially enters a pickling system 12, further cleaning of trace scale residues on the surface of the strip steel 3d2 is realized based on the chemical action of pickling, but the last layer of indissolvable oxide layer is still reserved, the strip steel 5a4 enters a second group of brushing systems 18 again, and after the final treatment of the inlet squeezing 18a1, the first group of brushing rollers 18b1, the second group of brushing rollers 18b2 and the outlet squeezing 18a2, the residual scale on the surface of the plate is completely cleaned, the surface roughness morphology is effectively improved, the surface quality required by the final process is achieved, and the process target is achieved.
Embodiment four:
referring to fig. 4, for the steel grade with stronger toughness of the high-strength steel and stainless steel, because the steel grade can bear bending and is not easy to crack, the scale can be broken by adopting withdrawal straightening or multi-roller straightening, and the scale structure always has an oxidation layer of indissolvable and acid liquor, so that the problems of pickling speed reduction, substandard surface finish and the like are directly caused. Therefore, according to the fourth embodiment, the problem that the scale is cracked and loosened by the steel plate 1 entering the withdrawal and straightening scale breaking system 10 to generate a large number of cracks, the output strip steel 2 enters the pre-descaling system 13, at the moment, the emitter 13a in the system 13 starts to spray the mixed jet 13b with the pressure of 5bar and containing the steel sand with the mass ratio of more than 50%, and the surface of the strip steel 2 realizes uniform peeling and loosening of the scale; the strip steel 3a1 with the cracked scale sequentially enters the water flushing unit 14 to flush and remove all abrasive particles and scale powder on the surface of the plate surface 3a1, and only water is remained on the plate surface 3b 1; then, the strip steel 3b1 firstly enters the roll gap of the inlet wringing roller 15a1 of the scrubbing box body 15, the plate surface of the strip steel 3b2 is lifted by the wringing roller 15a1, the plate surface elevation is matched with the process height, the strip steel stably enters the first pair of brush rollers 15b1 and the second pair of brush rollers 15b2, and then the strip steel passes through the roll gap of the outlet wringing roller 15a2, so that the process height of the strip steel 3c1 is always ensured to be in the process height range; wherein the first pair of brush rolls 15b1, the upper and lower roll bodies rotate relatively, the brush filaments in the contact area with the plate surface 3b2 all move towards the inlet direction of the strip steel; in the second pair of brush rolls 15b2, the upper and lower roll bodies are also rotated relatively, and the brush filaments in the contact area of the plate surface 3b1 are all moved toward the strip outlet direction. And the rotation speed and the rolling reduction of the two pairs of brush rolls 15b1/15b2 are equal. The strip steel 3c1 treated in this way enters a squeezing unit 16 and a drying system 17, so that the surface of the steel plate 3d1 is ensured not to remain any obvious water stain, the treated strip steel 3d1 sequentially enters an acid pickling system 12, further cleaning of trace scale residues on the surface of the strip steel 3d1 is realized based on the chemical action of acid pickling, the residual scale on the surface of the plate surface is completely cleaned, the surface quality required by the final post-process is achieved, and the process target is achieved.
The above description of the specific embodiments of the present invention is given by way of example only, but it should be understood that the specific description herein should not be construed as limiting the spirit and scope of the invention, which is applicable not only to the descaling of sheet metal strips, metal tubes, and the descaling of metal bars, but also to the descaling of metal bars, all such modifications to the above examples which would be apparent to one of ordinary skill in the art upon reading this disclosure are within the scope of the present invention.
The working principle of the invention is as follows:
when the device is used, firstly, the prepositive pre-descaling unit 13 is used for realizing the primary removal and scale cracking of scales on the upper surface and the lower surface of the metal plate strips 1 and 2, and improving the roughness of the plate surface in a mode of leaving a large number of pits, the tank body 12 of the chemical pickling is used for chemically soaking the strip steel 3c with only a small amount of scales left, removing the small amount of scales left finally, and achieving the final required qualified finished product 5a, the brush roller system 15 comprises two pairs of outer squeezing rollers 15a and two sets of brush roller systems 15b, and the surface of the strip steel 3b with high roughness is physically brushed to realize the further removal of the residual scales, and the scale residue rate on the surface of the strip steel 3c is further reduced.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a metal sheet area is few sour scale removal technology, includes at least one set of leading descaling cell 13 in advance, a set of brush roll system 15 and chemical pickling's cell body 12, its characterized in that: the prepositive pre-descaling unit 13 is used for realizing primary removal and scale cracking of scales on the upper surface and the lower surface of the metal plate strips 1 and 2, and improving the roughness of the plate surface in a mode of leaving a large number of pits, the tank body 12 of the chemical pickling is used for carrying out chemical soaking on the strip steel 3c with only a small amount of scales left, removing the small amount of scales left finally, and achieving a qualified finished product 5a required finally, the brush roller system 15 comprises two pairs of externally arranged squeezing rollers 15a and two sets of brush roller systems 15b, and physical brushing is carried out on the surface of the strip steel 3b with high roughness, so that the further removal of the residual scales is realized, and the scale residue rate on the surface of the strip steel 3c is further reduced.
2. A metal strip acid-free descaling process according to claim 1, wherein: the metal plate strip 1 (the metal plate strip with the temperature not higher than 200 ℃) runs to the front pre-descaling unit 13, the scale is broken and removed in the first pass through the mixed jet striking and grinding of the pre-descaling unit 13, a large number of tiny striking pits are reserved on the surface of the strip steel 3a2, the strip steel 3a2 is cleaned by the flushing box 14 at the moment, and the abrasive on the surface of the strip steel 3a2 is completely removed, so that the aim of only residual water is fulfilled.
3. A sheet metal strip acid-free descaling process as claimed in claim 2, wherein: the strip steel 3b2 enters the brushing system 15, the strip steel 3b2 firstly enters the roll gap of the inlet wringing roll 15a1 of the brushing box body 15, the surface elevation of the strip steel 3b2 is guaranteed to be identical with the process height, the strip steel stably enters the roll gap of the first pair of brushing rolls 15b1 and 15b2, then the strip steel passes through the roll gap of the outlet wringing roll 15a2, the process height of the strip steel 3b2 is finally guaranteed to be always kept within the process height range, and when the two pairs of brushing rolls 15b1/15b2 are pressed down and start grinding, the process height of the strip steel 3b2 is still kept within the process height range under the action of front-back tension and is not out of tolerance.
4. A sheet metal strip acid-free descaling process as claimed in claim 3, wherein: after the strip steel 3c2 passes through the dewatering and wringing roller 16, the surface residual water of the strip steel 3c2 is mostly removed, only a trace water film on the surface is remained, and then the strip steel is subjected to surface drying through the drying system 17 and enters the subsequent acid tank 12, so that the final scale removal of the metal strip 3d2 is realized.
5. A metal strip acid-free descaling process according to claim 1, wherein: the specific descaling mode of the pre-descaling unit 13 may be specifically indicated as high-speed spraying and beating of an aqueous solution (commonly called slurry) mixed with abrasive particles, so as to achieve the goal of descaling, the process is significantly different from the dry shot blasting and straightening process, the water quality standard of the water contained in the slurry adopted by the pre-descaling unit 13 is normal-temperature industrial clean circulating water, and specifically may be specified as follows: the temperature is below 100 ℃, the PH value is 6.5-9, the content of the particles is lower than 20mg/L, and the maximum granularity of the hard particles is 120 meshes.
6. A metal strip acid-free descaling process according to claim 5, wherein: the sand-shaped hard particles mixed in the slurry 13b used in the pre-descaling system 13 may specifically be specifically specified as metal processing pellets such as natural corundum abrasive (e.g. brown alumina, white corundum, single-crystal corundum, etc.), carbide abrasive (e.g. black silicon carbide, green silicon carbide, boron carbide, etc.), steel shot, steel wire cut shot, etc.
7. A metal strip acid-free descaling process according to claim 1, wherein: the flushing unit 14 is in a water flushing mode, the water body is circulating water of the pre-descaling unit 13, and can also be common industrial water, such as industrial water purification, fire water and the like, the dewatering and squeezing roller 16 is an encapsulation roller body of a steel roller surface, and the roller surface hardness is usually between 60 Shore degrees and 90 degrees; the drying unit 17 is an air purging system with the temperature exceeding 80 ℃ for removing and drying the residual water film full of the surface 3d2 of the plate, and the pickling system 12 is a tank body containing pickling solution with a certain concentration and a certain temperature, wherein the pickling solution can be sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, hydrogen peroxide, various mixed acids and the like.
8. A metal strip acid-free descaling process according to claim 1, wherein: the brushing system 15 specifically comprises: the rotating roller body with brush wires is directly contacted with the metal plate strip 3b2 for grinding, and simultaneously, cooling water is continuously sprayed; generally comprising four process devices, an inlet wringing roller 15a1, a first pair of brush rollers 15b1, a second pair of brush rollers 15b2, and an outlet wringing roller 15a2, wherein the brush rollers of the first pair of brush rollers 15b1 and the second pair of brush rollers 15b2 rotate in opposite directions for the purpose of generating tension to the scouring rollers; the inlet squeezing roller 15a1 and the outlet squeezing roller 15a2 are rubber covered rollers, so that the purpose of effectively blocking water mist, jet splash and the like generated during scrubbing can be achieved while strip steel is clamped.
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| CN202310599761.2A CN116571584A (en) | 2023-05-25 | 2023-05-25 | Metal plate strip acid-less descaling process |
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| CN202310599761.2A CN116571584A (en) | 2023-05-25 | 2023-05-25 | Metal plate strip acid-less descaling process |
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