CN103418624A - Continuous cold-state metal plate strip jet descaling technology - Google Patents
Continuous cold-state metal plate strip jet descaling technology Download PDFInfo
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Abstract
The invention relates to a continuous cold-state metal plate strip jet descaling technology. The technology includes the processes of shot blasting and pre-descaling, mixed jet descaling, high-pressure water washing, and wiping and drying. The technology is characterized in that the shot blasting and pre-descaling process (H1) comprises at least one centrifugal shot blasting unit (1); centrifugal wheels (11) are arranged on the upper side and the lower side of a metal plate strip (13) in each centrifugal shot blasting unit (1); the centrifugal wheels (11) rotate at a high speed to drive inside sandy hard particles (abrasive) (12) to be shot towards the two lateral surfaces of the metal plate strip (13) at a certain centrifugal speed so as to strip and loosen scales on the two lateral surfaces of the metal plate strip (13); the mixed jet descaling process (12) comprises at least one high-pressure mixed jet descaling unit (2); the high-pressure water washing process (H3) comprises at least one high-pressure pure water washing unit (3). A completely acidless green descaling mode is adopted to perform effective treatment on the upper surface and the lower surface of the metal plate strip with the scales, and a treatment effect of a next process is ensured not to be affected completely.
Description
Technical field
The present invention relates to the field of surface treatment of metal plate and belt, particularly, the present invention relates to a kind of cold conditions metal plate and belt solid jet descaling process, described cold conditions metal plate and belt solid jet descaling process is mainly used in realizing that the full plate face to the cold conditions metal plate and belt carries out the continuity de-scaling, the firecoat noresidue, the surface roughness that guarantee the positive and negative of the metal plate and belt after the jet de-scaling meet technological requirement simultaneously, guarantee simultaneously positive and negative can be all the time dry, clean enter next step operation.
Background technology
Metal material can form the fine and close covering that one deck is comprised of metal oxide in hot rolling or heat treatment process on surface, be commonly called as " firecoat ".The existence of this firecoat can cause impact as described below to further processing processing:
Make on the one hand the surface crack of material be difficult for being found in advance, thereby make the finished product processed have quality problems; On the other hand, easily firecoat is pressed into to metal surface, causes surface quality problems.In addition, the existence of hard oxide also can be accelerated the wearing and tearing of roll or drawbench.Therefore entering the front surface of steel plate firecoat removing step of cold-rolling mill is one of operation indispensable on cold rolling product line.
Impact for above-mentioned surperficial firecoat on metal material, the processing mode that manufacturing enterprise all adopts wet chemical to be cleaned is at present both at home and abroad removed the firecoat that adheres on metal plate and belt surface.For steel plate, it adopts the strongly acidic solution of sulfuric acid, hydrochloric acid and hydrofluoric acid usually.The production environment very severe of this wet chemical acid cleaning process, and must carry out the circular regeneration processing to a large amount of residual acid produced because produce, current described circular regeneration technique also certainly leads to corresponding toxic emission, contain a large amount of acidity, corrosivity composition in the waste gas of its discharge, as HCL, SO
2Deng, direct atmosphere pollution.
Based on this, clean for solving above-mentioned chemical method the serious problem of environmental pollution brought, researcher has carried out a large amount of research, has developed multiple technologies, removes the firecoat of metal surface to substitute this chemical method.As the electrolysis de-scaling, as described in method comprise, for example, electrolysis is ground and is eliminated squama, electric discharge de-scaling, electron beam de-scaling, laser de-scaling, grinds the descaling method of de-scaling, ball blast de-scaling, alternating bending de-scaling and the combination of above-mentioned distinct methods.Wherein especially with fastest developing speed with the high-pressure spray technique of scale removal, its process of industrialization is also obvious all the more.
For guaranteeing that the metal plate and belt after the mode of jet de-scaling can successfully enter next step treatment process, do not affect again the effect of next step PROCESS FOR TREATMENT simultaneously, many research and development units have proposed a series of solution targetedly, specific as follows:
1) certain non-ferrous metal heavy-duty machinery Co., Ltd once utilized mixing jet to remove the surperficial firecoat of alloy bar, and the alloy bar material surface after de-scaling adopts the Purge methods of pressure-air to carry out surface and removes.The major defect of this mode is the grains of sand that can't purge that embedding Surface of Rod Bar, causes surface to have hard composition granule residual, thereby causes bar easily to produce in next step rolling process because the blemish that hard composition granule is pressed into.
2) certain company of Germany utilizes mixing jet clean metal plane equally, and its post processing mode is: utilize the principle vacuumized, purified treatment is carried out on the surface after effects on surface is processed.Yet, the above problem of the same existence of this mode, therefore, the method not only can not effectively be removed the imbedding problem of hard composition granule, and simultaneously treated stablizing effect is not high, easily causes some surface not remove clean phenomenon.
By consulting Patents, also find abroad especially Japan, the metallurgical technology developed countries such as Germany, although it has proposed numerous relevant solid jets, the patent of polish-brush technique of scale removal or patent application technology, as Japanese JP06108277A discloses the descaling process that adopts spray acid and brush roll to be used in combination on the continuous cold rolling line, Japan JP55034688A discloses a kind of associating PV rolling scale breading-compound abrasive high-pressure spray de-scaling mode, Japan JP57142710A, JP57068217A, Japan JP59097711A, and Canadian TMW company discloses a series of US20080108281 of the clearance technique for the surface of steel plate firecoat (A1) after calendar year 2001, US20080182486 (A1) and US20090227184 (A1) etc., in addition, as U.S. US5388602, Japan Patent JP05092231A, the patent such as JP09085329A and JP2002102915 or patent application technical scheme, but remain in the part that has much room for improvement aspect the processing validity of the metal plate after processing the jet de-scaling.
Summary of the invention
For the problems referred to above, the object of the invention is: a kind of cold conditions metal plate and belt solid jet descaling process is provided, described cold conditions metal plate and belt solid jet descaling process is a kind of novel treatment process, the present invention adopts a kind of green de-scaling mode of complete anacidity effectively to process the metal plate and belt upper and lower surface with firecoat, guarantees not affect fully the treatment effect of next step operation.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, described cold conditions metal plate and belt solid jet descaling process mainly adopts the pre-de-scaling of ball blast, mixing jet de-scaling, high pressure water washing, extracts the positive and negative de-scaling that realizes metal plate and belt with the continuous processing mode of connecting of drying, so that soleplate face keeps dry, cleaning.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, described cold conditions metal plate and belt solid jet descaling process can effectively improve the surperficial clean level after the jet de-scaling.
For achieving the above object, the technical scheme of a kind of cold conditions metal plate and belt solid jet descaling process of the present invention is as follows:
A kind of cold conditions metal plate and belt solid jet descaling process, described cold conditions metal plate and belt solid jet descaling process comprises following operation: the pre-de-scaling of ball blast, the mixing jet de-scaling, high pressure water washing, extract and dry, it is characterized in that,
The pre-de-scaling step H 1 of described ball blast comprises at least one centrifugal ball blast unit 1, in centrifugal ball blast unit 1, two side faces up and down at metal plate and belt 13 arranges respectively centrifugal wheel 11, centrifugal wheel 11 High Rotation Speeds drive the hard composition granule abrasive material 12 of inner sand shape, make the hard composition granule abrasive material 12 of sand shape carry out impelling with certain centrifugal speed to two side surfaces of metal plate and belt 13, metal plate and belt 13 2 side surfaces are carried out to peeling off, getting loose of firecoat;
Described mixing jet de-scaling step H 2 comprises at least one high pressure mixing jet de-scaling unit 2;
Described high pressure water washing step H 3 comprises at least one High Pressure Pure Water cleaning unit 3.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, it is characterized in that, in the pre-de-scaling operation of described ball blast, described cold conditions metal plate and belt 13 is that temperature is not higher than the metal plate and belt of 200 ℃, as steel plate, aluminium sheet, titanium plate.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, it is characterized in that, in the jet de-scaling unit 2 of described mixing jet de-scaling operation, two side faces up and down at metal plate and belt 13 arranges respectively mixing nozzle 22 matrixes, described mixing nozzle 22 matrixes eject stable high pressure mixing jet 21, metal plate and belt 13 2 lateral plates after processing via the pre-de-scaling operation of described ball blast are carried out to sustained firing, remove the firecoat that residues in upper and lower two surfaces of metal plate and belt 13 fully.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, through the pre-de-scaling operation of described ball blast, on described cold conditions metal plate and belt, also have a large amount of firecoats residual, it enters jet de-scaling unit 2 automatically by the technique roller-way, mixing nozzle 22 matrixes that 2 inside, now jet de-scaling unit are arranged have up and down ejected stable high pressure mixing jet 21, after metal plate and belt 13 enters, high pressure mixing jet 21 carries out sustained firing to the positive and negative of metal plate and belt 13 at once, the fully removal of realization to metal plate and belt 13 upper and lower surface firecoats, metal plate and belt 13 upper and lower surfaces of complete firecoat to be removed always can be detained the hard composition granule abrasive material of a certain amount of sand shape, firecoat relic and water, this storage to metal plate and belt or enter lower technique process and will inevitably affect.
According to the present invention, preferably, described jet de-scaling unit 2 comprises each mixing nozzle group be comprised of 10-200 mixing jet nozzle arrangement of multiple row, and described mixing nozzle group is arranged up and down in pairs.
According to the present invention, preferably, the every row of described upper and lower mixing nozzle group arranged in pairs arrange 1-3 row.Form thus mixing nozzle group matrix.
According to the present invention, preferably, the described arrangement mode that adopts straight line between nozzle of respectively arranging is arranged.
According to the present invention, preferably, the quantity of described adjacent two row's nozzles can have the quantity variance of 1-2.
According to the present invention, preferably, between adjacent two row's nozzles in described injection unit, adopt certain transversion malposition to arrange, be that first row nozzle and second row nozzle are the magnitude of misalignment that half nozzle location is arranged on the width (horizontal) of metal plate and belt, its objective is the whole overall with that guarantees the injection intensity energy uniform fold metal plate and belt of all nozzles in a unit (two row's nozzles).
According to the present invention, preferably, every row's nozzle-axis of described mixing nozzle group and the angle of belt steel surface vertical line are between the 15-30 degree.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, metal plate and belt 13 after complete de-scaling is transferred to high pressure water washing step H 3 and extracts and baking operation H4, extracting and the dry drying functions that purges unit 5 of the high-pressure spray 31 sprayed by high pressure nozzle 32, squeeze roll 4, the metal plate and belt 13 of final output is not only residual without firecoat, and the plate face is dry, clean simultaneously.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, it is characterized in that, before the pre-de-scaling step H 1 of described ball blast, the multiple roll resistance straightening unit is set, described extract with baking operation H4 after thickness rolling unit or coating unit are set.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, it is characterized in that, the hard composition granule abrasive material 12 of sand shape adopted in described centrifugal impelling unit 1 can be the dry hard composition granule abrasive material of single kind sand shape, shot as a certain model, steel sand etc., it can be also the mixture of the hard composition granule abrasive material of certain several sand shape of drying, as two kinds of different model shots mixed mixture by a certain percentage, also can make the physical mixture of two media simultaneously, mixture as water and the hard composition granule abrasive material of certain single kind sand shape, or the mixture of water and the hard composition granule abrasive material of certain several sand shape.
Usually contain two media in the jet that described jet nozzle 22 sprays, a kind of medium is water, another medium is the tiny hard composition granule abrasive material of sand shape, and the mixing jet of two media to metal plate and belt 13 jet surfaces, is realized the removing to metal plate and belt 13 surface attachments by nozzle 1.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, the centrifugal impeller 11 that described centrifugal impelling unit 1 adopts is similar to the centrifugal wheel of existing shot-blasting machine, and its mode by centrifugal rotation is accelerated rear impelling to the hard composition granule abrasive material 12 of sand shape and gone out.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, it is characterized in that, in described mixing jet de-scaling operation, contain water and the hard composition granule abrasive material of sand shape in the jet that described jet nozzle 22 sprays, the industrial clean recirculated water that described water is normal temperature, its temperature below 100 ℃, pH value 6.5～9, the hard composition granule abrasive material of described sand shape content is 20 orders lower than 5mg/L, the hard composition granule abrasive material of described sand shape maximum particle size.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, it is characterized in that, the particle size range of the hard composition granule of sand shape is between 20 orders～120 orders.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, preferably, the particle size range of the hard composition granule of described sand shape is between 20 orders～50 orders.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, preferably, the expulsion pressure of the water of described mixing jet de-scaling is between 5MPa～80MPa, and preferably, the expulsion pressure of described aqueous medium is between 45MPa～65MPa.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, it is characterized in that,
The hard composition granule abrasive material of described sand shape comprise be selected from following one or more:
Be selected from the Naxas emery class abrasive material of brown corundum, white fused alumina, single alundum;
Be selected from the carbide abrasive material of black silicon carbide, green silicon carbide, boron carbide;
Be selected from the metal processing ball class of shot, steel sand, steel wire cut pill.
According to a kind of cold conditions metal plate and belt solid jet descaling process of the present invention, it is characterized in that, described extracting arranges at least one with baking operation and extracts the purging unit, and described extracting purges unit and comprises at least one pair of squeeze roll 4 and at least one dry unit 5 that purges.
Its agent set is referring to shown in Fig. 1～Fig. 2.
The accompanying drawing explanation
Fig. 1 is a kind of cold conditions metal plate and belt solid jet descaling process flow chart of the present invention.
Fig. 2 embeds a whole embodiment schematic diagram that produces line by this descaling process flow process.
Fig. 3 is that a pair of mixing nozzle group of arranging up and down of the present invention arranges 2 row's schematic diagrames.
In figure, the pre-de-scaling operation of H1 ball blast, H2 mixing jet de-scaling operation, H3 high pressure water washing operation, H4 extracts and baking operation, 1 is centrifugal ball blast unit, 2 is jet de-scaling unit, 3 is the High Pressure Pure Water cleaning unit, 4 squeeze rolls, the 5 dry unit that purge, 6 uncoilings (machine) section, the 7 pre-treatment sections that are H1, 8 cold conditions metal plate and belt solid jet descaling process sections of the present invention, the 9 aftertreatment technology sections that are H4, 10 batch (machine) section, 11 centrifugal impelling wheels, the hard composition granule abrasive material of 12 sand shape, 13 metal plate and belts, 21 high pressure mixing jets, 22 high pressure mixing nozzles, 31 high pressure washing water jets, 32 flushing water nozzles.
The specific embodiment
Below, for embodiment, illustrate cold conditions metal plate and belt solid jet descaling process of the present invention.
Embodiment
As mentioned above, the disclosed novel descaling process arrangement of this case specifically as shown in Figure 2, has good effect for guaranteeing the disclosed novel descaling process method for arranging of this case, and it mainly adopts following measure:
1) centrifugal impelling pretreatment: utilize the hard thing of sand shape (abrasive material) particle 12 of centrifugal high-speed projectile and metal plate and belt 13 to clash into, realize the firecoat pretreatment of metal plate and belt 13 upper and lower surfaces;
2) mixing jet de-scaling: descaling jet 22 adopts the mixing jet nozzle, contains a large amount of hard composition granules of tiny sand shape (abrasive material) in its jet, utilizes the high speed of the hard composition granule of sand shape to wash away function, realizes the quick removing to metal plate and belt 13 surperficial firecoats;
3) high pressure water washing: the lasting cleaning that adopts the High Pressure Pure Water of the intensive layout of certain pressure to carry out the plate face is sprayed, and realizes the continuous wash of plate face after de-scaling, removes that hard composition granule embeds, firecoat is residual etc.;
4) extract and dry: utilize the effect of extracting to realize the removal of large template face residual water, recycling compressed air carries out final drying and purges, and realizes metal plate and belt dry tack free, cleaning.
The present embodiment be take the continuity de-scaling of cold conditions steel plate and is embodiment, specific as follows:
Steel billet is curling after hot mill rolling, and then need to carry out a de-scaling continuously before entering cold-rolling mill, now coil of strip 13 is under the effect of uncoiler 6, realize that steel plate 13 enters pre-process technique process 7 in turn, steel plate 13 after pre-process technique process 7 is processed enters descaling process operation 8 successively, now at first steel plate 13 carries out pre-de-scaling de-scaling by centrifugal impelling operation 1, the mixture that the medium 11 that now centrifugal impelling operation 1 adopts is shot S110 and S170 and industry water carries out centrifugal impelling, realize that the firecoat on steel plate 13 surfaces removes substantially, but still have residual in a large number.
Then by jet de-scaling step H 2, now the mixing nozzle matrix in the H2 unit 22 to start expulsion pressures be 50MPa, contain the garnet mixing jet of 80 order that mass ratio is 15%, nozzle matrix 22 realizes steel plate 13 scale removal effect uniformities by specific configuration, and so the removal fully of firecoat has been realized on the surface of steel plate 13.
So, steel plate 13 is entered and is extracted and drying and processing step H 4 by H3, H4 utilizes inner squeeze roll 4 and extracts with the upper and lower surface of 5 pairs of steel plates 13 of baking operation and evenly extract, toast, finally realize that steel 13 surfaces can be residual any not water stain significantly, steel plate 13 after so processing can enter next PROCESS FOR TREATMENT operation 9 in turn, after PROCESS FOR TREATMENT operation 9 is disposed, steel plate 13 can enter coiling machine 10, realizes final curling.
Abovely by means of specific embodiment, the specific embodiment of the present invention has been described; but it should be understood that; here concrete description should not be construed as the restriction to the spirit and scope of the invention; this invention is not only applicable to the continuous de-scaling of metal plate and belt and processes; equally also can apply in the continuous de-scaling of metal strip thing, tubular metal thing, metal club; all these one of ordinary skilled in the art, reading the various modifications of after this specification, above-described embodiment being made, belong to the scope that the present invention protects.
The present invention takes full advantage of high-speed jet and High Pressure Pure Water, compressed-air actuated purging effect, realized to cold conditions metal plate firecoat once fully, continuously, de-scaling efficiently processes.Because this patent institute employing technology is ripe, can implement, apply feasible.On the other hand, the present invention can well adapt to the environmental requirement of metallurgical production and the further requirement of improving product competitiveness, improves the ability of the energy-saving and emission-reduction of smelter.Therefore, the present invention has broad application prospects at cold rolling production field.
Claims (10)
1. a cold conditions metal plate and belt solid jet descaling process, described cold conditions metal plate and belt solid jet descaling process comprises following operation: the pre-de-scaling of ball blast, the mixing jet de-scaling, high pressure water washing, extract and dry, it is characterized in that,
The pre-de-scaling operation of described ball blast (H1) comprises at least one centrifugal ball blast unit (1), in centrifugal ball blast unit (1), two side faces up and down at metal plate and belt (13) arranges respectively centrifugal wheel (11), centrifugal wheel (11) High Rotation Speed drives the hard composition granule abrasive material of inner sand shape (12), make the hard composition granule abrasive material of sand shape (12) carry out impelling with certain centrifugal speed to two side surfaces of metal plate and belt (13), metal plate and belt (13) two side surfaces are carried out to peeling off, getting loose of firecoat;
Described mixing jet de-scaling operation (H2) comprises at least one high pressure mixing jet de-scaling unit (2);
Described high pressure water washing operation (H3) comprises at least one High Pressure Pure Water cleaning unit (3).
2. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 1, is characterized in that, in the pre-de-scaling operation of described ball blast, described cold conditions metal plate and belt (13) for the temperature that is selected from steel plate, aluminium sheet, titanium plate not higher than the metal plate and belt of 200 ℃.
3. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 1, it is characterized in that, in the jet de-scaling unit (2) of described mixing jet de-scaling operation, two side faces up and down at metal plate and belt (13) arranges respectively mixing nozzle (22) matrix, described mixing nozzle (22) matrix ejects stable high pressure mixing jet (21), metal plate and belt (13) two lateral plates after processing via the pre-de-scaling operation of described ball blast are carried out to the hard composition granule abrasive material of sustained firing sand shape, remove the firecoat that residues in upper and lower two surfaces of metal plate and belt (13) fully.
4. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 1, metal plate and belt after complete de-scaling (13) is transferred to high pressure water washing operation (H3) and extracts and baking operation (H4), extracting and the dry drying functions that purges unit (5) of the high-pressure spray (31) sprayed by high pressure nozzle (32), squeeze roll (4), the metal plate and belt (13) of final output is not only residual without firecoat, and the plate face is dry, clean simultaneously.
5. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 1, it is characterized in that, front in the pre-de-scaling operation of described ball blast (H1), the multiple roll resistance straightening unit is set, described extract with baking operation (H4) after thickness rolling unit or coating unit are set.
6. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 1, it is characterized in that, the hard composition granule abrasive material of sand shape (12) adopted in described centrifugal impelling unit (1) is selected from: the dry hard composition granule abrasive material of single kind sand shape or the mixture of the hard composition granule abrasive material of certain several sand shape, the mixture of water and the hard composition granule abrasive material of certain single kind sand shape, or the mixture of water and certain several abrasive material.
7. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 6, is characterized in that, the medium in the jet that described jet nozzle (22) sprays is the hard composition granule abrasive mixture of water and sand shape.
8. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 6, it is characterized in that, the industrial clean recirculated water that described water is normal temperature, its temperature is below 100 ℃, pH value is 6.5～9, and the hard composition granule abrasive material of described sand shape content is 20 orders lower than 5mg/L, the hard composition granule abrasive material of described sand shape maximum particle size.
9. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 1, is characterized in that, the hard composition granule abrasive material of described sand shape comprise be selected from the subordinate one or more:
Be selected from the Naxas emery class abrasive material of brown corundum, white fused alumina, single alundum;
Be selected from the carbide abrasive material of black silicon carbide, green silicon carbide, boron carbide;
Be selected from the metal processing ball class of shot, steel sand, steel wire cut pill.
10. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 1, it is characterized in that, described extracting arranges at least one with baking operation and extracts the purging unit, and described extracting purges unit and comprise at least one pair of squeeze roll (4) and at least one dry unit (5) that purges.
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