CN102728632B - Method for reducing emulsion black spots on surface of cold rolling product - Google Patents
Method for reducing emulsion black spots on surface of cold rolling product Download PDFInfo
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- CN102728632B CN102728632B CN201210165273.2A CN201210165273A CN102728632B CN 102728632 B CN102728632 B CN 102728632B CN 201210165273 A CN201210165273 A CN 201210165273A CN 102728632 B CN102728632 B CN 102728632B
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Abstract
The invention provides a method for reducing emulsion black spots on the surface of a cold rolling product. A V-shaped shovel head is arranged at the front end of an upper anti-winding guide plate of a rolling mill, and an emulsion baffle is arranged between an upper drying roll and a sweeping beam. The method comprises the following steps of: enabling the upper anti-winding guide plate to extend out when changing the pass in a rolling process, switching a valve of an emulsion pipeline to be a close state so as to enable emulsion reserved in emulsion feeding pipelines of an upper supporting roll, an upper intermediate roll and an upper working roll to drop on the upper anti-winding guide plate, and carrying out pass rolling; stopping the emulsion in advance when the length of a pass steel belt before being produced to be finished-product leaves over 20m, extending the upper anti-winding guide plate to contain the emulsion reserved in the emulsion pipes, lifting up the drying roll to enable the emulsion outside the drying roll to be brought into a rolling mill along with steel, and starting sweeping; and after the rolling mill stops, pressing down the drying roll, converting the rolling pass, starting the emulsion, and starting to roll again.
Description
Technical field
The invention belongs to metallurgical cold rolling technology field, specifically, relate to a kind of method of the emulsion blackspot that reduces product surface, more particularly, relate to a kind of solution and be equipped with the method for the multiple roll reversable cold-rolling machine product surface emulsion blackspot of squeeze roll.
Background technology
For thering are the single chassis six roller reversable cold-rolling machines of squeeze roll, its concrete rolling flow process in the time producing is: during except threading, squeeze roll is lifting status, in the operation of rolling, squeeze roll is all the time in depressed state, to prevent that emulsion from refluxing, wherein, in the time carrying out one-pass roller, before machine, emulsion is opened, and purging is closed, and emulsion is closed after machine, purge and open; In the time carrying out the inferior rolling of two pass, after machine, emulsion is opened, and purging is closed, and before machine, emulsion is closed, and purges and opens.
There are single chassis six roll reversing rollers of squeeze roll in the time switching passage, the steel strip surface in the region between squeeze roll and roll can be emulsion remained, after emulsion valve switches, in pipeline, residual a large amount of emulsions also can constantly drop onto steel strip surface simultaneously.In the time of reverse rolling, due to the plate shape difference that steel band itself exists, this part emulsion can constantly be taken out of along the gap between squeeze roll and steel band with steel band.Now, conventionally adopt purging to eliminate; But, due to the reason of width of steel band and purging existence itself, it is most of that emulsion is actual can not be blown off, but the vaporific liquid of broken formation and floating to above process channel, condense again and be attached on various pipes and equipment, constantly drop onto steel strip surface with the operation of rolling afterwards, cause secondary pollution, thereby cause plate face emulsion remained too much, long.There is chemical change in steel band, form blackspot after batching in hot environment, thereby not only can affect the presentation quality of product, is forced to excision simultaneously in lower procedure, thereby seriously reduced lumber recovery owing to cannot using.
Summary of the invention
In order to solve technical problem above-mentioned, the invention provides a kind of solution and have the method for the single chassis six roller reversable cold-rolling machine product surface emulsion blackspots of squeeze roll.The method is according to the mode of " combining the two ways of dredging and plugging ", to extracting the outlet process equipments such as roll-type single chassis six roller reversable cold-rolling machine strippers, purging, rational control device has been invented in design, and by mode of operation method is improved and optimizated, reduce the residual emulsion of plate face, reduce to greatest extent plate face emulsion black patch.
According to the present invention, a kind of method of the emulsion blackspot that reduces cold-rolled products surface is provided, in described method, at the front end of the upper stripper of milling train, V-arrangement shovel head is installed, and between upper squeeze roll and purging beam, emulsion baffle plate is installed, when described method comprises the steps: to change passage in the operation of rolling, upper stripper stretches out, the valve of emulsion pipeline switches to closed condition, the interior residual emulsion droplet of emulsion supply line of upper backup roll, upper intermediate calender rolls and top working roll is fallen on stripper, then carried out passage rolling; In the time of the length residue 20m producing to passage steel band before finished product, close down in advance emulsion, stretch out stripper to catch emulsion remaining in pipeline, then lift squeeze roll the emulsion of squeeze roll outside is brought in milling train with steel, open and purge; Milling train is depressed squeeze roll after stopping, and conversion rolling pass, opens emulsion, then start rolling.
According to the present invention, described shovel head can be made up of stainless steel.
According to the present invention, the V-shaped shape of the cross section of described shovel head.
According to the present invention, can on the contact-making surface of upper stripper and shovel head, smear fluid sealant.
According to the present invention, can below described emulsion baffle plate, weld guiding gutter, make guiding gutter towards upper squeeze roll direction, wherein, emulsion baffle plate is connected with the bearing block of upper squeeze roll, blow device is connected and fixes with emulsion baffle plate, thereby upper squeeze roll, emulsion baffle plate and blow device can form one lifting device.
According to the present invention, described emulsion baffle plate can be made up of the thick steel plate of 12mm.
According to the present invention, in the time carrying out one-pass roller, squeeze roll, emulsion baffle plate and purge beam all in depressed state, the stripper after milling train stretches out, and emulsion stops, and purge and open, and stripper before milling train is retracted, and emulsion is opened, and purging stops.
According to the present invention, in the time carrying out two pass time rolling, squeeze roll, emulsion baffle plate and purge beam all in depressed state, the stripper after milling train is retracted, and emulsion is opened, and purging stops, and stripper before milling train stretches out, emulsion stops, and purges and opens.
According to the present invention, described cold-rolled products can be the rolled products of single chassis six roller reversable cold-rolling machines.
Therefore, the invention discloses a kind of solution and have the method for extracting roll-type single chassis six roller reversable cold-rolling machine product surface emulsion blackspots, by shutoff, dredge and the optimizing and revising of mode of operation method, both avoided control device and purge nozzle fragile, reduce again emulsion residue, solve product surface emulsion residue, promoted product surface quality, also improved and had the stability of extracting the six roller reversable cold-rolling machine operations of roll-type single chassis.
Accompanying drawing explanation
Comprise that accompanying drawing provides further understanding, and accompanying drawing is incorporated in this manual and forms the part of this description.Accompanying drawing shows exemplary embodiment, and is used for together with the description explaining the principle of inventive concept.In the accompanying drawings:
Fig. 1 shows the schematic diagram of purging used according to the invention and squeeze roll control device;
Fig. 2 shows according to the schematic diagram of the plugging device of upper stripper of the present invention;
Fig. 3 A shows according to the structural representation of the shovel head of the part of the A for Fig. 2 of the upper stripper of prior art;
Fig. 3 B shows the structural representation of the shovel head for upper stripper of the present invention of the A part in Fig. 2.
In the accompanying drawings, the description of reference numerals of use is as follows:
1-compressed air; 2-purges beam; 3-emulsion baffle plate; The upper squeeze roll of 4-; Squeeze roll under 5-; 6-steel band; The upper stripper of 7-; 8-the first emulsified liquid injection gear; 9-the second emulsified liquid injection gear; 10-top working roll; The upper intermediate calender rolls of 11-; 12-upper backup roll; 13-guiding gutter.
The specific embodiment
The invention provides a kind of method of the emulsion blackspot that reduces cold-rolled products surface.Specifically, in the present invention, by emulsion remainedly carrying out shutoff, dredge what affecting steel strip surface quality,, improve by the shovel head to stripper and purging control device, and by adjusting Optimum Operation methods, passage shifts to an earlier date stop-spraying emulsion before finished product, reduce to greatest extent emulsion low to steel strip surface.
Describe in detail according to the method for the emulsion blackspot on minimizing cold-rolled products of the present invention surface below in conjunction with accompanying drawing.
It is pointed out that for convenience of explanation, illustrate as an example of single chassis six roll reversing rollers example in the present invention, but, the invention is not restricted to this.It will be understood by those skilled in the art that method of the present invention equally can be for the multiple roll reversable cold-rolling machine that is equipped with squeeze roll of other type.
Fig. 1 shows according to the schematic diagram of purging of the present invention and squeeze roll control device, and Fig. 2 shows according to the schematic diagram of upper stripper plugging device of the present invention.
With reference to Fig. 1, comprise purging beam 2, emulsion baffle plate 3 and upper squeeze roll 4 according to purging of the present invention and squeeze roll control device, wherein, emulsion baffle plate 3 is arranged on and purges between beam 2 and upper squeeze roll 4, and the below of emulsion baffle plate 3 is welded with guiding gutter 13, make the direction of guiding gutter 13 towards upper squeeze roll 4.According to one embodiment of present invention, purging beam 2 can be made up of stainless steel material.According to the present invention, the purge nozzle that purges beam 2 can be flat.According to one embodiment of present invention, can adopt specifications and models is the purge nozzle of SILVENT973, controls the pressure of compressed air 1 in the scope of 0.4～0.6MPa.
According to the present invention, emulsion baffle plate 3 is connected and fixed with the bearing block of upper squeeze roll 4, purges beam 2 and is connected and fixed with emulsion baffle plate 3.Specifically, purging beam 2 and emulsion baffle plate 3 interconnects with the bearing block of upper squeeze roll 4, and be fixed on the bearing block of squeeze roll 4, therefore, purge beam 2 and emulsion baffle plate 3 and can, with upper squeeze roll 4 one liftings, form one lifting device thereby purge beam 2, emulsion baffle plate 3 and upper squeeze roll 4.The control principle of this one lifting device is as follows: in the operation of rolling, upper squeeze roll 4 is in depressed state, and the nozzle that purges beam 2 is pressed close to steel band 6 so that compressed air 1 is sprayed to steel band 6.In the time purging beam 2 in opening, the compressed air 1 that the emulsion of leakage is purged breaks into vaporific, and is blown into by the space of emulsion baffle plate 3 belows with the air-flow of compressed air 1, is blocked by upper squeeze roll 4.Now, upper squeeze roll 4 is in the state of turning clockwise, air-flow and vaporific emulsion are along rising on the space between the surface of upper squeeze roll 4 and the guiding gutter of emulsion baffle plate 3, under the effect of the rotary centrifugal force of upper squeeze roll 4, remaining emulsion is thrown to the inner surface of emulsion baffle plate 3, and flow to along inner surface in the guiding gutter 13 of emulsion baffle plate 3 bottoms, then flow to steel band both sides.
It will be understood by those skilled in the art that for being equipped with the multiple roll reversable cold-rolling machine of squeeze roll, upper squeeze roll and lower squeeze roll be conventionally in unjustified state, and doing like this one is for fear of the steel band distortion that is squeezed, and the 2nd, extract effect in order to increase.Upper and lower squeeze roll is driven voller, the position of upper squeeze roll can lifting, the position of lower squeeze roll is fixed, in the time carrying out one-pass roller, upper squeeze roll turns clockwise, and lower squeeze roll is to be rotated counterclockwise, in the time carrying out the inferior rolling of two pass, upper squeeze roll is rotated counterclockwise, and lower squeeze roll is to turn clockwise.
With reference to Fig. 2, at the front end of the upper stripper 7 of single chassis six roller reversable cold-rolling machines, V-shaped shovel head is installed, and is utilized screw will shovel head to be fixed on the front end of upper stripper 7, so that the maintenance of shovel head is changed.On the contact-making surface of upper stripper 7 and shovel head, smear fluid sealant, stop because weeping does not sternly appear in laminating, thereby form above stripper plugging device.
Although not shown, but those skilled in the art should be understood that, for the multiple roll reversable cold-rolling machine with squeeze roll, before and after milling train, be provided with squeeze roll and lower squeeze roll, and because lower stripper is positioned at steel band below, do not affect the existence of the emulsion in steel strip surface, therefore, lower stripper does not participate in the control to emulsion, and just plays the effect of transition guide plate.Therefore, for clarity, hereinafter the operation to lower stripper is not described in detail.
Fig. 3 A shows according to the structural representation of the shovel head of the part of the A for Fig. 2 of the upper stripper of prior art, and Fig. 3 B shows the structural representation of the shovel head for upper stripper of the present invention of the A part in Fig. 2.
With reference to Fig. 3 A, be nylon shovel head according to the shovel head of the upper stripper of prior art, the front end of shovel head is descending inclined-plane.As shown in Figure 3A, in the time that stripper stretches out, between shovel head and roll, have space, the emulsion that drops on stripper top flows down along shovel head, drops on steel band, causes plate face emulsion remained many.Different with it, with reference to Fig. 3 B, in the present invention, the shovel head of upper stripper 7 is designed to " V " shape, thereby can be effectively by the emulsion water conservancy diversion on upper stripper to upper stripper both sides.Specifically, as shown in Figure 3 B, the cross section of shovel head is " V " word shape,, thereby the front end of shovel head is first downward-sloping and then be inclined upwardly and be " V " word shape, thereby can guarantee that the emulsion that drops on stripper top remains on stripper, then emulsion flows to the both sides of stripper.Concrete restriction is not done at this in the angle of inclination of " V " shape shovel head, and those skilled in the art can carry out as the case may be actual selection under instruction of the present invention.
Continue with reference to Fig. 2, upper backup roll 12 and upper intermediate calender rolls 11 that the first emulsified liquid injection gear 8 is used for to single chassis six roller reversable cold-rolling machines spray emulsion, and the second emulsified liquid injection gear 9 is used for the top working roll 10 of single chassis six roller reversable cold-rolling machines to spray emulsion.According to one embodiment of present invention, the stroke of upper stripper 7 can be in the scope of 12cm～15cm, emulsion pipeline pressure≤0.9MPa.
Although shown in Fig. 2 is two emulsified liquid injection gears, the invention is not restricted to this.For multiple roll reversable cold-rolling machine, the emulsified liquid injection gear of respective numbers can be set according to actual conditions, to spray emulsion to each roller.
The control principle of stripper will be described in detail below.
With reference to Fig. 2, by adopting the shovel head of " V " shape, make stripper 7 form overall radical occlusion device, change passage in the operation of rolling time, upper stripper 7 stretches out, and the valve of emulsion pipeline switches.After valve closing, in the emulsion supply line of top working roll 10, upper intermediate calender rolls 11 and top backing up roll 12, residual emulsion will drop onto on stripper 7; Now, because the forward and backward Fang Jun of upper stripper 7 is in sealed condition, so this part emulsion can only flow to the both sides of stripper 7, thereby avoided emulsion to flow on steel band 6.
See figures.1.and.2, can comprise the steps: to change passage in the operation of rolling according to the method for the emulsion blackspot on minimizing cold-rolled products of the present invention surface time, upper stripper 7 stretches out, the valve of emulsion pipeline switches to closed condition, the interior residual emulsion droplet of emulsion supply line of upper backup roll 12, upper intermediate calender rolls 11 and top working roll 10 is fallen on stripper 7, then carried out passage rolling; In the time of the length residue 20m producing to passage steel band before finished product, close down in advance emulsion (in steel strip surface, remaining emulsion enough remains the rolling lubrication of 20m steel band), stretch out stripper 7 to catch emulsion drippage remaining in pipeline, then lift squeeze roll 4 and lower squeeze roll 5, the emulsion of squeeze roll outside is entered in milling train with steel band 6, open and purge to reduce as much as possible the residual emulsion of plate face; After milling train stops, depress upper and lower squeeze roll, conversion rolling pass, opens emulsion, then starts rolling, and plate face only has a small amount of emulsion, after purging, can eliminate.
The present invention will be further described below in conjunction with specific embodiments, but the invention is not restricted to this.
Comparative examples 1
Adopt the existing single chassis six roller reversable cold-rolling machines with squeeze roll to produce the belt steel product that steel grade is SPCC (generally using cold rolling carbon steel thin plate and steel band), specification 0.3mm × 1200mm.Concrete steps are as follows:
1) threading, before machine, after machine, squeeze roll is all in lifting status, and purging beam is stationary state, and after machine, stripper stretches out, and emulsion, purging are all in halted state.
2) one-pass roller, before machine, after machine, squeeze roll is all in depressed state, and purging beam is stationary state.After machine, stripper stretches out, and emulsion stops, and purges and opens; Before machine, stripper is retracted, and emulsion is opened, and purging stops.
3) two pass time rolling, before machine, after machine, squeeze roll is all in depressed state, and purging beam is stationary state.Before machine, stripper stretches out, and emulsion stops, and purges and opens; After machine, stripper is retracted, and emulsion is opened, and purging stops.
In comparative examples 1, because upper stripper shovel head is inclined-plane (as shown in Figure 3A), take advantage of a situation again and flow to steel strip surface so the emulsion in pipeline can constantly drop onto on stripper; Squeeze roll place does not have baffle plate, and the emulsion blowing afloat forms secondary pollution to plate face, causes plate face emulsion to purge unclean.
Adopt method of the present invention to produce the belt steel product that steel grade is SPCC (generally using cold rolling carbon steel thin plate and steel band), specification 0.3mm × 1200mm.Concrete steps are as follows:
1) threading: squeeze roll, emulsion baffle plate, purging beam are all in lifting status, and the upper stripper after milling train stretches out, and emulsion, purging are all in halted state, as shown in Figure 1.
2) one-pass roller: squeeze roll, emulsion baffle plate and purging beam are all in depressed state.See figures.1.and.2, the stripper after milling train stretches out, and emulsion stops, and purge and open, and stripper before milling train is retracted, and emulsion is opened, and purging stops.When the inferior rolling of two pass, otherwise.That is to say, in the time of the inferior rolling of two pass, squeeze roll, emulsion baffle plate and purging beam are all in depressed state; Stripper after milling train is retracted, and emulsion is opened, and purging stops, and stripper before milling train stretches out, and emulsion stops, and purges and opens.It should be noted that at this, because lower stripper is arranged on the below of steel band, whether the emulsion not affecting in steel strip surface exists, and therefore, it does not participate in controlling, and only plays the effect of transition guide plate.Therefore the stripper of, mentioning in operation above refers to stripper.
3) before the front passage back end whip of finished product; in the time of belt length residue 20m; close in advance and shut down rear emulsion; after machine, upper stripper stretches out, and upper squeeze roll lifts, and purging is opened; now going up stripper catches the emulsion of remaining continuous drippage in emulsion pipeline; flow to the both sides of steel band along upper stripper, the residual emulsion of steel strip surface enters milling train with steel band, meets rolling lubrication needs.Changing before passage, reduce as far as possible the residual emulsion of steel strip surface.
4) while being transformed into final pass, after machine, squeeze roll is depressed, and purge nozzle is pressed close to steel strip surface, remaining a small amount of emulsion is broken into vaporific, is ejected into squeeze roll surface.Now go up squeeze roll and be and clockwise rotate, under the effect of centrifugal force, the emulsion on body surface is thrown out of.The whole shutoff of emulsion that emulsion baffle plate throws away squeeze roll, and drip and drop down onto in the collection guiding gutter of bottom along baffle surface, then flow to steel band both sides, avoid the secondary pollution of emulsion.
The SPCC band steel making by embodiment 1, there is not emulsion blackspot in product surface substantially.
Therefore, the method according to this invention, by shutoff, dredge and the optimizing and revising of mode of operation method, both avoided control device and purge nozzle fragile, reduce again emulsion residue, solve product surface emulsion residue, promoted product surface quality, also improved and had the stability of extracting the six roller reversable cold-rolling machine operations of roll-type single chassis.
In sum, the invention has the advantages that:
First, the present invention is directed to extract the emulsion blackspot of roll-type single chassis six roller reversable cold-rolling machine product surfaces more, be difficult to the feature eliminated, milling train internal process equipment is designed, invents, transformed, and by Optimum Operation methods, reduce the residual emulsion of plate face, reduce the formation of emulsion blackspot, improved product surface quality, thereby promoted product specification.
The second, the problem that the flat nylon shovel that the present invention is directed to stripper is fragile, cannot effectively stop emulsion, adopts " V " shape shovel head of steel, has both guaranteed the needs of rolling, has improved shovel service life, has effectively stopped again the drippage of emulsion.
The 3rd; the present invention is directed to the feature of the too low fragile and wringing roller in fixed purge nozzle position; adopt " one lift " blow device that installs emulsion baffle plate between beam and upper squeeze roll additional purging; both effectively protected purge nozzle; extend the service life of purge nozzle, promoted again purging effect.
The 4th, the present invention designs in conjunction with the feature of rolling mill technology equipment, small investment, and instant effect, effective, use simple, easy to maintenance.
The 5th, facts have proved, the method according to this invention, can guarantee the stable smooth operation of milling train, safe and reliable, effectively solves and has the emulsion blackspot of extracting roll-type single chassis six roller reversable cold-rolling machine product surfaces.
Although specifically illustrate and described the present invention with reference to exemplary embodiment of the present invention, but it should be understood by one skilled in the art that, in the case of not departing from the spirit and scope of the present invention that limited by claim and equivalent thereof, can make the change in various forms and details at this.
Claims (9)
1. one kind is reduced the method for the emulsion blackspot on cold-rolled products surface, it is characterized in that in described method, at the front end of the upper stripper of milling train, V-arrangement shovel head is installed, and between upper squeeze roll and purging beam, emulsion baffle plate is installed, below described emulsion baffle plate, weld guiding gutter, make guiding gutter towards upper squeeze roll direction, described method comprises the steps:
Change passage in the operation of rolling time, upper stripper stretches out, the valve of emulsion pipeline switches to closed condition, and the interior residual emulsion droplet of emulsion supply line of upper backup roll, upper intermediate calender rolls and top working roll is fallen on stripper, then carries out passage rolling;
In the time of the length residue 20m producing to passage steel band before finished product, close down in advance emulsion, stretch out stripper to catch emulsion remaining in pipeline, then lift squeeze roll and lower squeeze roll the emulsion of squeeze roll and lower squeeze roll outside is brought in milling train with steel, open and purge;
Milling train is depressed squeeze roll and lower squeeze roll after stopping, and conversion rolling pass, opens emulsion, then start rolling.
2. the method for the emulsion blackspot on minimizing cold-rolled products according to claim 1 surface, is characterized in that described shovel head is made up of stainless steel.
3. the method for the emulsion blackspot on minimizing cold-rolled products according to claim 1 surface, is characterized in that the described V-shaped shape of cross section of shoveling head.
4. according to the method for the emulsion blackspot on the minimizing cold-rolled products surface described in any one in claims 1 to 3, it is characterized in that smearing fluid sealant on the contact-making surface of upper stripper and shovel head.
5. the method for the emulsion blackspot on minimizing cold-rolled products according to claim 1 surface, it is characterized in that emulsion baffle plate is connected with the bearing block of upper squeeze roll, blow device is connected and fixes with emulsion baffle plate, thereby upper squeeze roll, emulsion baffle plate and blow device form one lifting device.
6. the method for the emulsion blackspot on minimizing cold-rolled products according to claim 5 surface, is characterized in that described emulsion baffle plate is made up of the thick steel plate of 12mm.
7. the method for the emulsion blackspot on minimizing cold-rolled products according to claim 1 surface, it is characterized in that in the time carrying out one-pass roller, upper squeeze roll, lower squeeze roll, emulsion baffle plate and purging beam are all in depressed state, stripper after milling train stretches out, emulsion stops, and purge and open, and stripper before milling train is retracted, emulsion is opened, and purging stops.
8. the method for the emulsion blackspot on minimizing cold-rolled products according to claim 1 surface, it is characterized in that in the time carrying out the inferior rolling of two pass, upper squeeze roll, lower squeeze roll, emulsion baffle plate and purging beam are all in depressed state, stripper after milling train is retracted, emulsion is opened, and purging stops, and stripper before milling train stretches out, emulsion stops, and purges and opens.
9. the method for the emulsion blackspot on minimizing cold-rolled products according to claim 1 surface, is characterized in that described cold-rolled products are the rolled products of single chassis six roller reversable cold-rolling machines.
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| CN201210165273.2A CN102728632B (en) | 2012-05-25 | 2012-05-25 | Method for reducing emulsion black spots on surface of cold rolling product |
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| CN201210165273.2A CN102728632B (en) | 2012-05-25 | 2012-05-25 | Method for reducing emulsion black spots on surface of cold rolling product |
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| CN110496864B (en) * | 2019-07-02 | 2022-01-11 | 首钢智新迁安电磁材料有限公司 | Cold rolling equipment and cold rolling treatment method |
| CN114985490A (en) * | 2022-05-30 | 2022-09-02 | 首钢京唐钢铁联合有限责任公司 | Eighteen-roller cold rolling equipment and control method |
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