CN1864880A - An acidless descaling process for cold rolled steel strip and manufacturing device thereof - Google Patents
An acidless descaling process for cold rolled steel strip and manufacturing device thereof Download PDFInfo
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- CN1864880A CN1864880A CN 200610086831 CN200610086831A CN1864880A CN 1864880 A CN1864880 A CN 1864880A CN 200610086831 CN200610086831 CN 200610086831 CN 200610086831 A CN200610086831 A CN 200610086831A CN 1864880 A CN1864880 A CN 1864880A
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Abstract
The invention relates to a method for removing scale of cold rolling strip steel without acid. Wherein, the strip steel on the release machine, via the drawing roller, is fed to the cutter to be cut head or cut end; it uses welder to weld the head and end; feeding it to the wide adjustable free sheath to be stored; feeding it to multi-roller tooth scale remover to break the ferric oxide on the surface of strip steel; the steel brusher removes the left scale skin; in the scale removing box, the high-pressure water flows with the wet sand with 5% water content to brush the strip steel; washing it with water after removing scale; the strip steel via two steering rollers torsions the strip steel for 180 degrees; via another scale removing box, it removes the ferric oxide skin left on the back of strip steel; feeding it to another wide adjustable free sheath to be stored; feeding it to passive groove; to passivate the strip steel; the strip steel via another cutter is cut; the cut strip steel is fed to the coiling machine to be coiled. The invention has lower cost and lower metal consumption of strip steel, without fuel consumption.
Description
Technical field
The present invention relates to a kind of process and process units of cold-rolled steel sheet de-scaling, relate in particular to a kind of process and process units of anacidity de-scaling of cold-strip steel.
Background technology
The band steel is before cold rolling, must thoroughly remove its surperficial iron scale (being commonly called as " squama "), traditional method is to use the pickling de-scaling, this method cost height, metal consumption is big, and environmental pollution is big, and some units are in the new technology of research anacidity de-scaling both at home and abroad, but its investment is very big, the production requirement that can't guarantee to reach euphotic belt that has.The shortcoming of pickling: 1) cost height: light acid consumption steel per ton adds the coal consumption or the oil consumption of heating usefulness about 50 yuan, and per ton cost is promptly in 60-80 unit, even higher.2) steel consumption is big: the steel consumption of general steel mill is 1.5～2%, have up to 3%, main cause is that the reaction speed of ferro element and acid of steel itself is greater than iron oxide and sour reaction speed, so inevitably can cause overpickling during pickling.The overpickling phenomenon is changing the welding of stopping of acid initial stage and kink useless, and is even more serious during change of lap.Have data to show that the iron loss that overpickling causes is 0.5%, but the result of our test will introduce all-sidely below far above this.3) make during pickling steel band produce hydrogen embrittlement inevitably, this is particularly important to steel alloy, high-carbon steel.4) floor space is big: adopt continuous acid-washing technology, production line length is generally about 100～150 meters.5) acid mist is serious to human body harm, to surrounding environment, electromechanical equipment seriously corroded.Spent acid handle investment big, take up an area of manyly, do not handle then the river, generations such as crops have a strong impact on.The abrasive high-pressure water descaling method of foreign study is invested greatly at present, and the hydraulic pressure height (be generally 25～35Mpa), thereby the de-scaling cost is also high.Particularly cause the metal surface to embed abrasive material easily.Employed pump can only be a plunger displacement pump, this failure of pump rate height, maintenance difficult, price height.
Summary of the invention
Many at metal consumption in the existing cold-rolling steel strip pickling descaling process, need heating, the cost height, and adopting the investment of abrasive high-pressure water descaling process big, fault is many, inconvenient maintenance, the surface is the technical deficiency of burning into sand easily, the object of the present invention is to provide the high hydraulic pressure de-scaling of a kind of mechanical descaling and abrasive material process combined method and process units, abrasive material adopts river sand, and high-pressure hydraulic pump uses the centrifugal multistage pump multiple centrifugal pump of maximum pressure 8～12Mpa.
For achieving the above object, the technical solution used in the present invention is:
A kind of process of cold-rolled steel strip acid-free de-scaling is characterized in that: the process of anacidity de-scaling is:
1, will be with steel by toothed multiple roll descaling mill, the iron scale of broken belt steel surface, and will clean out with the broken iron scale of peeling off on the steel;
2, the band steel that will peel off iron scale is sent into the steel brush machine, and firecoat broken but that also be retained on the band steel is brushed;
3, the band steel that will handle in step [2] is sent in the De-scaling box, adopts water content to be no more than 10% damp sand and mixes with water under high pressure, and belt steel surface is washed away de-scaling, washes belt steel surface with clear water after the de-scaling;
4, the band steel that will handle in step [3] is sent into deactivation slot, carries out the passivation of steel plate;
5, the band steel after the passivation is sheared rolling as required.
Described employing dampness supplies sand continuously, and the water under high pressure that adopts the centrifugal multistage pump multiple centrifugal pump of pressure 8～12Mpa to provide mixes the wash zone steel with the damp sand of water content 5% with water under high pressure before the high-pressure water descaling nozzle; Damp sand adopts river sand or sintering groove sieve fine ore or Iron Ore Powder down.
Described band steel is placed on the unreeling machine, after the band steel passes through gripping roll or straightener, delivers to cutter, carries out crop or back-end crop; Band steel with last volume back-end crop behind the one winding steel crop of back welds with welding machine; Band steel after the passivation is heavily needed to shear by volume by cutter; Band steel after the shearing is delivered to the winder clot; The band steel will be respectively stores maintenance descaling process continuity temporarily in the free kink of width modulation type before entering the multiple roll descaling mill, before entering deactivation slot.
Described toothed multiple roll descaling mill, steel brush machine are to band steel front, reverse side de-scaling simultaneously; Band steel after the positive de-scaling will be with steel to turn round turnback through two reversing rollers, again through a De-scaling box, remove the remaining iron scale of band steel reverse side.
A kind of process units of cold-rolled steel strip acid-free de-scaling, be included in and be provided with unreeling machine, gripping roll, cutter, welding machine, De-scaling box, deactivation slot, another cutter, winder on the production line successively, be provided with a high-pressure hydraulic pump, be provided with high-pressure water descaling nozzle, water flooding nozzle above the band steel in De-scaling box, on De-scaling box, be provided with for the sand machine, its feature also is: be provided with steel brush machine, multiple roll descaling mill before De-scaling box successively forward, on De-scaling box, be provided with confession sand machine, above confession sand machine, be provided with the sand machine of carrying of damp sand.
Described multiple roll descaling mill is provided with several at the staggered band discaling roll wheel in band steel both sides; The steel brush machine is provided with several at the staggered band brush roll wheel in band steel both sides; The band steel passes through from every group of running roller to pressure; Be provided with the (operating) water nozzle of compressed-air atomizer, precipitation dust in the multiple roll descaling mill.
Described high-pressure water descaling nozzle is flat fan-shaped outer mixed mode nozzle, mounting layer flow rectifier in the fan nozzle; High-pressure hydraulic pump is the centrifugal multistage pump multiple centrifugal pump of 8～12Mpa.
The described reversing roller that behind De-scaling box, is provided with two band steel; Connect another De-scaling box behind two reversing rollers, be provided with another high-pressure water descaling nozzle, another water flooding nozzle above the band steel in another De-scaling box; Two water under high pressure descaling jets link to each other through water pipe, and two water flooding nozzles link to each other through water pipe; And be provided with another for the sand machine.
Describedly before the multiple roll descaling mill, behind another De-scaling box, be respectively equipped with a free kink of width modulation type.
The described sand machine that supplies is provided with flat damp sand sand export; Be provided with agitator for being respectively equipped with one above the sand machine for sand bucket in the sand bucket at two, the agitator upper end connects motor; Be respectively equipped with the sand pond in two De-scaling boxs, one side, one carries sand machine lower end is located in the sand pond, and the upper end is located at for sand bucket upper shed place; Carry the sand machine and be provided with and carry sand machine funnel, be provided with water-filtering net putting forward sand machine funnel bottom; The De-scaling box bottom is provided with the sand eaves gutter groove towards the sand pond.
Beneficial effect of the present invention is: anacidity consumption, need not heat in the descaling process, and consume fuel not, de-scaling hydraulic pressure is low; Low cost of manufacture; The anacidity working environment does not have injury to producers, and corrosion damage equipment has not thoroughly solved the problem of environmental pollution that spent acid brings; The metal consumption of sheet metal strip is little, and metal consumption is less than 0.4% after the de-scaling, and the belt steel surface after the processing is even, hydrogen embrittlement and burning into sand phenomenon can not occur; Operating noise is no more than 70 decibels; The low price of abrasive material; Shorten the length of production line greatly, can reduce floor space, saved investment.
Description of drawings
Fig. 1 is the schematic diagram of process units structure of the present invention.
Fig. 2 is the structural representation for the sand machine.
Fig. 3 is the vertical view of high-pressure water descaling nozzle.
Fig. 4 is the partial front elevation view of high-pressure water descaling nozzle.
Description of reference numerals is as follows:
The free kink 6 multiple roll band tooth descaling mills of 1 unreeling machine, 2 gripping rolls, 3 cutters, 4 welding machines, 5 width modulation types 7 steel brush machines 8 are carried sand machine funnel 18 for sand bucket 19 De-scaling boxs 20 band steel 21 sand eaves gutter grooves 22 laminar flow rectifiers for sand machine 9 high-pressure water descaling nozzles 10 water flooding nozzles 11 reversing rollers 12 deactivation slots 13 winders 14 high-pressure hydraulic pumps 15 filters 16 sand ponds 17
The specific embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
The present invention is not limited to following preferred forms; anyone can draw other various forms of products under enlightenment of the present invention; though but on its shape or structure, do any variation, every have identical with a application or akin technical scheme, all in protection scope of the present invention.
Except the band steel, the inventive method and device also are applicable to the steel plate (or other sheet metals) that has cut, just can dispense unreeling machine 1, cutter 3, welding machine 4, the free kink 5 of width modulation type, winder 13 in apparatus of the present invention, another cutter 3.
As shown in Figure 1, the process of anacidity de-scaling of the present invention is:
1, the casting skin band steel 20 usefulness cranes of de-scaling do not winch on the unreeling machine 1, behind gripping roll 2, deliver to cutter 4 and carry out crop or back-end crop, and the big or bigger steel grade of thickness of hardness preferably changes gripping roll 2 into straightener, so that the good welding in aligning back.
2, weld with the band steel 20 usefulness welding machines 4 of last volume back-end crop behind the crop.
3, the band steel 20 after the welding is delivered to the free kink 5 of width modulation type through second gripping roll 2 and is stored.
4, the 3rd gripping roll 2 of band steel 20 usefulness in the free kink 5 of width modulation type sent into multiple roll band tooth descaling mill 6 and will be with steel 20 scale on surface fragmentations, the broken iron scale of peeling off is blown off by the compressed air in the machine, and is dashed to machine external iron sheet ditch by the water pipe in the machine.
5, the band steel of handling through multiple roll band tooth descaling mill 6 20 is disposed the broken firecoat that still is retained on the band steel 20 in surface by steel brush machine 7.
6, the band steel of handling in the step 5 20 is sent in the De-scaling box 19, adopt dampness to supply sand continuously, the water under high pressure that the centrifugal multistage pump multiple centrifugal pump of employing pressure 8～12Mpa provides, adopted fan-shaped high-pressure water descaling nozzle 9, laminar flow rectifier 22 has been installed in the high-pressure water descaling nozzle 9, strengthened effective de-scaling width of each high-pressure water descaling nozzle 9, the damp sand of water content 5% has been mixed wash zone steel 20 with water under high pressure, water flooding nozzle 10 flushed zone steel 20 after the de-scaling before high-pressure water descaling nozzle 9.
7, the band steel 20 after the positive de-scaling will be with steel 20 to turn round turnback through two reversing rollers 11, through another De-scaling box 19, remove the remaining iron scale of band steel 20 reverse side.
8, the band steel 20 that will handle in step 7 is sent into deactivation slot 12, with the passivation of steel 20.
9, the band steel 20 after the passivation is heavily needed to shear by volume by another cutter 3, the band steel 20 after the shearing is delivered to winder 13 clots.
The supply flow process of damp sand is:
In the sand pond 16, collect the sand water of de-scaling and the dry sand that replenishes.By carrying sand machine funnel 17 sand is picked up, water flows back to the sand pond from carry sand machine funnel 17, and damp sand is sent to in the sand bucket 18.For the damp sand in the sand bucket 18, as required by stepless reducing motor control, evenly deliver to, again by before evenly delivering to each high-pressure water descaling nozzle 9 for sand machine 8, after water under high pressure mixes, to the 20 surperficial de-scalings of band steel in the sand machine 8.
Technological parameter of the present invention:
Widen device width, nozzle width, increase nozzle quantity, can adapt to the band steel 20 of being wider than 900mm.
As shown in Figure 1, process units of the present invention be included in the free kink 5 of unreeling machine 1, gripping roll 2, cutter 3, welding machine 4, gripping roll 2, width modulation type that sets gradually on the production line, multiple roll band tooth descaling mill 6, steel brush machine 7, for sand machine 8, De-scaling box 19, gripping roll 2, two reversing rollers 11, gripping roll 2, another is for sand machine 8, another De-scaling box 19, gripping roll 2, the free kink 5 of another width modulation type, gripping roll 2, deactivation slot 12, another cutter 3, gripping roll 2, winder 13.Be provided with high-pressure water descaling nozzle 9, water flooding nozzle 10 above the band steel 20 in De-scaling box 19, be located on the De-scaling box 19 for sand machine 8, also be provided with a high-pressure hydraulic pump 14, high-pressure hydraulic pump 14 is the centrifugal multistage pump multiple centrifugal pump of 8～12Mpa.
Multiple roll band tooth descaling mill 6 is provided with five staggered band discaling roll wheels; Steel brush machine 7 is provided with four staggered band brush roll wheels (band brush roll wheel is the steel brush running roller, and running roller does not in the drawings all draw); Be provided with the (operating) water nozzle that two-sided compressed-air atomizer, bottom are provided with flushing in the multiple roll band tooth descaling mill 6, be used for to band steel 20 positive and negative de-scalings and eliminate dust.
One clear water house steward is divided into two, and one is the normal pressure pipe, links to each other with two water flooding nozzles 10, and another links to each other with centrifugal multistage pump multiple centrifugal pump through filter 15, and centrifugal multistage pump multiple centrifugal pump links to each other through water pipe with two water under high pressure descaling jets 9.
As shown in Figure 2, be respectively equipped with one for sand bucket 18 at two above for sand machine 8, be provided with agitator in the sand bucket 18, the agitator upper end connects motor.Be respectively equipped with sand pond 16, in two De-scaling boxs, 19 1 sides and carry sand machine lower end and be located in the sand pond 16, the upper end is located at for sand bucket 18 upper sheds place.Carry the sand machine and be provided with and carry sand machine funnel 17, carry sand machine funnel 17 bottoms and be provided with water-filtering net, reduce water content in the sand as much as possible.De-scaling box 19 bottoms are provided with the sand eaves gutter groove 21 towards sand pond 16.
As shown in Figure 3, Figure 4, high-pressure water descaling nozzle 9 has adopted the flat fan nozzle, makes jet width bigger.Mounting layer flow rectifier 22 in the high-pressure water descaling nozzle 9 can make the water bundle that directionality is more arranged, and water jet becomes laminar flow by turbulent flow, thereby has increased the hitting power of water under high pressure.Increase effective de-scaling width of each high-pressure water descaling nozzle 9, can process wideer band steel 20.
Claims (10)
1, a kind of process of cold-rolled steel strip acid-free de-scaling is characterized in that: the process of anacidity de-scaling is:
[1], will be with steel by toothed multiple roll descaling mill, the iron scale of broken belt steel surface, and will band on the steel the iron scale peeled off of fragmentation clean out;
[2], the band steel that will peel off iron scale sends into the steel brush machine, firecoat broken but that also be retained on the band steel is brushed;
[3], the band steel that will handle in step [2] sends in the De-scaling box, adopts water content to be no more than 10% damp sand and mixes with water under high pressure, and belt steel surface is washed away de-scaling, washes belt steel surface with clear water after the de-scaling;
[4], the band steel that will handle in step [3] sends into deactivation slot, carries out the passivation of steel plate;
[5], the band steel after the passivation is sheared rolling as required.
2, the process of cold-rolled steel strip acid-free de-scaling according to claim 1, it is characterized by: adopt dampness to supply sand continuously, the water under high pressure that adopts the centrifugal multistage pump multiple centrifugal pump of pressure 8～12Mpa to provide mixes the wash zone steel with the damp sand of water content 5% with water under high pressure before the high-pressure water descaling nozzle; Damp sand adopts river sand or sintering groove sieve fine ore or Iron Ore Powder down.
3, the process of cold-rolled steel strip acid-free de-scaling according to claim 1 is characterized by: the band steel is placed on the unreeling machine, after the band steel passes through gripping roll or straightener, delivers to cutter, carries out crop or back-end crop; Band steel with last volume back-end crop behind the one winding steel crop of back welds with welding machine; Band steel after the passivation is heavily needed to shear by volume by cutter; Band steel after the shearing is delivered to the winder clot; The band steel will be respectively stores maintenance descaling process continuity temporarily in the free kink of width modulation type before entering the multiple roll descaling mill, before entering deactivation slot.
4, according to the process of claim 1 or 3 described cold-rolled steel strip acid-free de-scalings, it is characterized by: toothed multiple roll descaling mill, steel brush machine are to band steel front, reverse side de-scaling simultaneously; Band steel after the positive de-scaling will be with steel to turn round turnback through two reversing rollers, again through a De-scaling box, remove the remaining iron scale of band steel reverse side.
5, a kind of process units of cold-rolled steel strip acid-free de-scaling, be included in and be provided with unreeling machine, gripping roll, cutter, welding machine, De-scaling box, deactivation slot, another cutter, winder on the production line successively, be provided with a high-pressure hydraulic pump, be provided with high-pressure water descaling nozzle, water flooding nozzle above the band steel in De-scaling box, on De-scaling box, be provided with for the sand machine, its feature also is: be provided with steel brush machine, multiple roll descaling mill before De-scaling box successively forward, on De-scaling box, be provided with confession sand machine, above confession sand machine, be provided with the sand machine of carrying of damp sand.
6, the process units of cold-rolled steel strip acid-free de-scaling according to claim 5 is characterized by: the multiple roll descaling mill is provided with several at the staggered band discaling roll wheel in band steel both sides; The steel brush machine is provided with several at the staggered band brush roll wheel in band steel both sides; The band steel passes through from every group of running roller to pressure; Be provided with the (operating) water nozzle of compressed-air atomizer, precipitation dust in the multiple roll descaling mill.
7, the process units of cold-rolled steel strip acid-free de-scaling according to claim 5 is characterized by: the high-pressure water descaling nozzle is flat fan-shaped outer mixed mode nozzle, mounting layer flow rectifier in the fan nozzle; High-pressure hydraulic pump is the centrifugal multistage pump multiple centrifugal pump of 8～12Mpa.
8, according to the process units of claim 5 or 7 described cold-rolled steel strip acid-free de-scalings, it is characterized by: the reversing roller that behind De-scaling box, is provided with two band steel; Connect another De-scaling box behind two reversing rollers, be provided with another high-pressure water descaling nozzle, another water flooding nozzle above the band steel in another De-scaling box; Two water under high pressure descaling jets link to each other through water pipe, and two water flooding nozzles link to each other through water pipe; And be provided with another for the sand machine.
9, the process units of cold-rolled steel strip acid-free de-scaling according to claim 8 is characterized by: be respectively equipped with a free kink of width modulation type before the multiple roll descaling mill, behind another De-scaling box.
10, the process units of cold-rolled steel strip acid-free de-scaling according to claim 8 is characterized by: be provided with flat damp sand sand export for the sand machine; Be provided with agitator for being respectively equipped with one above the sand machine for sand bucket in the sand bucket at two, the agitator upper end connects motor; Be respectively equipped with the sand pond in two De-scaling boxs, one side, one carries sand machine lower end is located in the sand pond, and the upper end is located at for sand bucket upper shed place; Carry the sand machine and be provided with and carry sand machine funnel, be provided with water-filtering net putting forward sand machine funnel bottom; The De-scaling box bottom is provided with the sand eaves gutter groove towards the sand pond.
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| CN102126185B (en) * | 2010-09-29 | 2013-07-10 | 杭州九龙厨具制造有限公司 | Shot peening process for removing scale on surface of steel belt |
| CN102172834A (en) * | 2010-12-30 | 2011-09-07 | 宝山钢铁股份有限公司 | Production line and process for continuous rolling of single rack |
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