CN103418624B - A kind of cold conditions metal plate and belt solid jet descaling process - Google Patents

A kind of cold conditions metal plate and belt solid jet descaling process Download PDF

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CN103418624B
CN103418624B CN201210165951.5A CN201210165951A CN103418624B CN 103418624 B CN103418624 B CN 103418624B CN 201210165951 A CN201210165951 A CN 201210165951A CN 103418624 B CN103418624 B CN 103418624B
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scaling
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abrasive material
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CN103418624A (en
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段明南
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Baoshan Iron and Steel Co Ltd
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Abstract

A kind of cold conditions metal plate and belt solid jet descaling process, comprise following operation: the pre-de-scaling of ball blast, mixing jet de-scaling, high pressure water washing, extract and oven dry, it is characterized in that, described ball blast pre-de-scaling operation (H1) comprises at least one centrifugal ball blast unit (1), centrifugal ball blast unit (1), at the two side faces up and down of metal plate and belt (13), centrifugal wheel (11) is set respectively, centrifugal wheel (11) High Rotation Speed drives inner sand shape hard object particle (abrasive material) (12), sand shape hard object particle (12) is made to carry out impelling with certain centrifugal speed to two side surfaces of metal plate and belt (13), metal plate and belt (13) two side surface is carried out to the stripping of firecoat, get loose, 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).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 the treatment effect not affecting next step operation completely.

Description

A kind of cold conditions metal plate and belt solid jet descaling process
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 carrying out continuity de-scaling to the full plate face of cold conditions metal plate and belt, firecoat noresidue, the surface roughness of the positive and negative of the metal plate and belt after simultaneously ensureing jet de-scaling meet technological requirement, guarantee that positive and negative dryly, clean all the time can enter next step operation simultaneously.
Background technology
Metal material can form the fine and close covering that one deck is made up 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 processing process further:
On the one hand the surface crack of material is not easily found in advance, thus make the finished product processed there are quality problems; On the other hand, easily firecoat is pressed into metal surface, causes surface quality problems.In addition, the existence of hard oxide also can accelerate the wearing and tearing of roll or drawbench.Therefore entering the surface of steel plate firecoat removing step before cold-rolling mill is one of operation of indispensability on cold rolling product line.
For above-mentioned surperficial firecoat on the impact of metal material, the processing mode that domestic and international manufacturing enterprise all adopts wet chemical to carry out cleaning at present is to remove the attachment firecoat 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 circular regeneration process must be carried out to a large amount of residual acid produced because of producing, current described circular regeneration technique also certainly leads to corresponding toxic emission, containing a large amount of acidity, corrosive elements 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 Heavy environmental pollution problem brought, researcher has carried out large quantifier elimination, develops multiple technologies, to substitute the firecoat that this chemical method removes metal surface.As electrolysis de-scaling, as described in method comprise, such as, the de-scaling of electrolysis grinding, electric discharge de-scaling, electron beam de-scaling, laser de-scaling, grinding de-scaling, ball blast de-scaling, alternating bending de-scaling and above-mentioned distinct methods combination descaling method.Wherein especially with fastest developing speed with high-pressure spray technique of scale removal, its process of industrialization is also obvious all the more.
For the metal plate and belt after ensureing mode of jet de-scaling can successfully enter next step treatment process, do not affect again the effect of next step PROCESS FOR TREATMENT, many research and development units propose a series of solution targetedly, specific as follows simultaneously:
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 cannot purge that embedding Surface of Rod Bar, causes surface to have hard object particle residue, thus causes bar easily to produce in next step rolling process because the blemish of hard object particle press-in.
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 process.But this mode exists above problem equally, therefore, the method not only effectively can not remove the imbedding problem of hard object particle, and the stablizing effect simultaneously processed is not high, easily causes some surface not remove clean phenomenon.
By consulting Patents, also external especially Japan is found, the metallurgical technology developed countries such as Germany, although it proposes numerous relevant solid jets, the patent of polish-brush technique of scale removal or patent application technology, as Japanese JP06108277A discloses the descaling process adopting spray acid to combinationally use with brush roll on 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 clearance technique US20080108281 (A1) for surface of steel plate firecoat after calendar year 2001, US20080182486 (A1) and US20090227184 (A1) etc., in addition, as U.S. US5388602, Japan Patent JP05092231A, the patents such as JP09085329A and JP2002102915 or patent application technical scheme, but remain in the part that has much room for improvement in the process validity of the metal plate after the de-scaling of process jet.
Summary of the invention
For the problems referred to above, the object of the invention is: provide 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 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 the treatment effect not affecting next step operation completely.
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 with the continuous processing mode of connecting of drying to realize the positive and negative de-scaling of metal plate and belt, keeps dry, clean to make most soleplate face.
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 effectively can improve the clean surface degree after 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, mixing jet de-scaling, and high pressure water washing, extracts and oven dry, it is characterized in that,
Described ball blast pre-de-scaling step H 1 comprises at least one centrifugal ball blast unit 1, at centrifugal ball blast unit 1, at the two side faces up and down of metal plate and belt 13, centrifugal wheel 11 is set respectively, centrifugal wheel 11 High Rotation Speed drives inner sand shape hard object abrasive material particles 12, make sand shape hard object abrasive material particles 12 carry out impelling with certain centrifugal speed to two side surfaces of metal plate and belt 13, to metal plate and belt 13 2 side surface carry out firecoat stripping, get loose;
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 be temperature not higher than the metal plate and belt of 200 DEG C, 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, at the two side faces up and down of metal plate and belt 13, mixing nozzle 22 matrix is set respectively, described mixing nozzle 22 matrix ejects stable high pressure mixing jet 21, carry out sustained firing to via metal plate and belt 13 2 lateral plates after the process of described ball blast pre-de-scaling operation, remove the firecoat residuing in metal plate and belt about 13 two surface completely.
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, described cold conditions metal plate and belt also have a large amount of firecoats remain, it enters jet de-scaling unit 2 automatically by technique roller-way, mixing nozzle 22 matrix that now jet de-scaling unit 2 inside is arranged up and down has 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, realize the removal completely to metal plate and belt 13 upper and lower surface firecoat, metal plate and belt 13 upper and lower surface of complete firecoat to be removed always can be detained a certain amount of sand shape hard object abrasive material particles, firecoat relic and water, this is to the storage of 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 the mixing nozzle group that multiple row is respectively made up of 10-200 mixing jet nozzle arrangement, and described mixing nozzle group is arranged up and down in pairs.
According to the present invention, preferably, described upper and lower mixing nozzle group arranged in pairs often arranges and arranges 1-3 row.Form mixing nozzle group matrix thus.
According to the present invention, preferably, the arrangement mode of straight line is adopted to arrange between described each row's nozzle.
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, certain transversion malposition arrangement is adopted between adjacent two row's nozzles in described injection unit, namely first row nozzle and second row nozzle are the magnitude of misalignment having half nozzle location on the width (namely laterally) of metal plate and belt, its objective is the whole overall with of the injection intensity energy uniform fold metal plate and belt of all nozzles in guarantee unit (two row's nozzles).
According to the present invention, preferably, the angle of often row's nozzle-axis and the belt steel surface vertical line of described mixing nozzle group is between 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 extract and baking operation H4, extracting and the dry drying functions purging 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 not only remains without firecoat, and 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, multiple roll resistance straightening unit is set, described extract with baking operation H4 after thickness setting rolling unit or coating unit.
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 sand shape hard object abrasive material particles 12 adopted in described centrifugal impelling unit 1 can be dry single kind sand shape hard object abrasive material particles, as the shot of a certain model, steel sand etc., also can be the mixture of certain dry several sand shape hard object abrasive material particles, as two kinds of different model shots mixed mixture by a certain percentage, also can make the physical mixture of two media simultaneously, as the mixture of water and certain single kind sand shape hard object abrasive material particles, or the mixture of water and certain several sand shape hard object abrasive material particles.
Usually containing two media in the jet that described jet nozzle 22 sprays, a kind of medium is water, another medium is tiny sand shape hard object abrasive material particles, and the mixing jet of two media is sprayed to metal plate and belt 13 surface by nozzle 1, realizes the removing to metal plate and belt 13 surface attachments.
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 it accelerates rear impelling by the mode of centrifugal rotation to sand shape hard object abrasive material particles 12 and goes 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, containing water and sand shape hard object abrasive material particles in the jet that described jet nozzle 22 sprays, described water is the industrial net circulating water of normal temperature, its temperature below 100 DEG C, pH value 6.5 ~ 9, described sand shape hard object abrasive material particles content is 20 orders lower than 5mg/L, described sand shape hard object abrasive material particles 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 sand shape hard object particle is between 20 order ~ 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 described sand shape hard object particle is between 20 order ~ 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,
Described sand shape hard object abrasive material particles comprise be selected from following one or more:
Be selected from the Naxas emery class abrasive material of Brown Alundum, white fused alumina, single alundum;
Be selected from the carbide abrasives of black silicon carbide, green silicon carbide, boron carbide;
Be selected from the intermetallic composite coating 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 in extract and at least one is set with baking operation extracts purging unit, described in extract and purge unit and comprise at least one pair of squeeze roll 4 and at least one dryly purges unit 5.
Its agent set is see shown in Fig. 1 ~ Fig. 2.
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.
This descaling process flow process is embedded the overall embodiment schematic diagram producing line by Fig. 2.
Fig. 3 is that a pair 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 High Pressure Pure Water cleaning unit, 4 squeeze rolls, 5 dry purging unit, 6 uncoilings (machine) section, 7 is the pre-treatment section of H1, 8 cold conditions metal plate and belt solid jet descaling process sections of the present invention, 9 is the aftertreatment technology section of H4, 10 batch (machine) section, 11 centrifugal impelling wheels, 12 sand shape hard object abrasive material particles, 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.
Detailed description of the invention
Below, for embodiment, illustrate cold conditions metal plate and belt solid jet descaling process of the present invention.
Embodiment
As mentioned above, novel descaling process arrangement disclosed in this case is concrete as shown in Figure 2, and for ensureing that disclosed in this case, novel descaling process method for arranging has good effect, it mainly adopts following measure:
1) centrifugal impelling pretreatment: utilize sand shape hard object (abrasive material) particle 12 of centrifugal high-speed projectile to clash into metal plate and belt 13, realize the firecoat pretreatment of metal plate and belt 13 upper and lower surface;
2) mixing jet de-scaling: descaling jet 22 adopts mixing jet nozzle, containing a large amount of tiny sand shape hard object particle (abrasive material) in its jet, utilizes the high speed of sand shape hard object particle to wash away function, realizes the quick removing to the surperficial firecoat of metal plate and belt 13;
3) high pressure water washing: the lasting cleaning adopting the High Pressure Pure Water of intensive layout of certain pressure to carry out plate face is sprayed, realizes the continuous wash in plate face after de-scaling, removes that hard object particle embeds, firecoat remains;
4) extract and oven dry: utilize the effect extracted 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 with the continuity de-scaling of cold conditions steel plate for embodiment, specific as follows:
Steel billet is curling after hot mill rolling, and then need before entering cold-rolling mill to carry out a de-scaling continuously, now coil of strip 13 is under the effect of uncoiler 6, realize steel plate 13 and enter pre-process technique process 7 in turn, steel plate 13 after pre-process technique process 7 processes enters descaling process operation 8 successively, now first steel plate 13 carries out pre-de-scaling de-scaling by centrifugal impelling operation 1, the medium 11 that now centrifugal impelling operation 1 adopts is that the mixture of shot S110 and S170 and industry water carries out centrifugal impelling, the firecoat realizing steel plate 13 surface is removed substantially, but still have a large amount of residual.
Then start expulsion pressure by the mixing nozzle matrix 22 in jet de-scaling step H 2, now H2 unit to be 50MPa, to be the garnet mixing jet of 80 order of 15% containing mass ratio, nozzle matrix 22 is realized steel plate 13 scale removal effect uniformity by specific configuration, and the surface of steel plate 13 like this achieves the removal completely of firecoat.
Steel plate 13 from H2 treatment process out after, enter high pressure water cleaning step H 3 at once, H3 operation utilizes its inside to carry out High Pressure Pure Water injection according to the High Pressure Pure Water nozzle 32 of evenly arrangement on steel plate width direction, the firecoat removing surface completely remains, embed the garnet grains etc. on surface, realizes the removing of surface particles thing.
So, steel plate 13 is entered by H3 and extracts and drying and processing step H 4, H4 utilizes inner squeeze roll 4 and extracts and evenly extracts with the upper and lower surface of baking operation 5 pairs of steel plates 13, toast, finally realizing steel 13 surface can not remain any water stain significantly, steel plate 13 after process like this 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.
The specific embodiment of the present invention is described above by means of specific embodiment; 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 process of metal plate and belt; 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 to the various amendments that above-described embodiment is made, belong to the scope that the present invention protects after reading this specification.
The present invention makes full use of high-speed jet and High Pressure Pure Water, compressed-air actuated purging effect, achieve to cold conditions metal plate firecoat once completely, continuously, de-scaling process efficiently.Because technology that this patent adopts is ripe, can implement, apply feasible.On the other hand, the present invention well can adapt to the requirement to the environmental requirement of metallurgical production and improving product competitiveness further, 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 (8)

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, mixing jet de-scaling, and high pressure water washing, extracts and oven dry, it is characterized in that,
Described ball blast pre-de-scaling operation (H1) comprises at least one centrifugal ball blast unit (1), at the two side faces up and down of the metal plate and belt (13) of centrifugal ball blast unit (1), centrifugal wheel (11) is set respectively, centrifugal wheel (11) High Rotation Speed drives inner sand shape hard object abrasive material particles (12), make sand shape hard object abrasive material particles (12) carry out impelling with certain centrifugal speed to two side surfaces of metal plate and belt (13), to metal plate and belt (13) two side surface carry out firecoat stripping, get loose;
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);
Metal plate and belt (13) after complete de-scaling is transferred to high pressure water washing operation (H3) and extracts and baking operation (H4), extracting and the dry drying functions purging 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 not only remains without firecoat, and plate face is dry, clean simultaneously;
Front in described ball blast pre-de-scaling operation (H1), multiple roll resistance straightening unit is set, extracts and baking operation (H4) thickness setting rolling unit or coating unit afterwards described.
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 be selected from steel plate, aluminium sheet, titanium plate temperature not higher than the metal plate and belt of 200 DEG C.
3. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 1, is characterized in that,
In high pressure mixing jet de-scaling unit (2) of described mixing jet de-scaling operation, at the two side faces up and down of metal plate and belt (13), mixing nozzle (22) matrix is set respectively, described mixing nozzle (22) matrix ejects stable high pressure mixing jet (21), carry out sustained firing sand shape hard object abrasive material particles to via metal plate and belt (13) two lateral plates after the process of described ball blast pre-de-scaling operation, remove the firecoat residuing in upper and lower two surfaces of metal plate and belt (13) completely.
4. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 1, is characterized in that,
Sand shape hard object abrasive material particles (12) adopted in described centrifugal ball blast unit (1) is selected from: dry single kind sand shape hard object abrasive material particles or the mixture of certain several sand shape hard object abrasive material particles, the mixture of water and certain single kind sand shape hard object abrasive material particles, or the mixture of water and certain several abrasive material.
5. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 3, is characterized in that,
Medium in the jet that described mixing nozzle (22) sprays is water and sand shape hard object abrasive material particles mixture.
6. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 4, is characterized in that,
Described water is the industrial net circulating water of normal temperature, and its temperature is below 100 DEG C, and pH value is 6.5 ~ 9, and described sand shape hard object abrasive material particles content is 20 orders lower than 5mg/L, described sand shape hard object abrasive material particles maximum particle size.
7. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 1, is characterized in that,
Described sand shape hard object abrasive material particles comprise be selected from following one or more:
Be selected from the Naxas emery class abrasive material of Brown Alundum, white fused alumina, single alundum;
Be selected from the carbide abrasives of black silicon carbide, green silicon carbide, boron carbide;
Be selected from the intermetallic composite coating ball class of shot, steel sand, steel wire cut pill.
8. a kind of cold conditions metal plate and belt solid jet descaling process as claimed in claim 1, is characterized in that,
Described extracting arranges at least one with baking operation and extracts purging unit, described in extract and purge unit and comprise at least one pair of squeeze roll (4) and at least one dryly purges unit (5).
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