CN102266924A - Continuous cast-rolling process for producing 5005 aluminum plastic strip billet - Google Patents

Continuous cast-rolling process for producing 5005 aluminum plastic strip billet Download PDF

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Publication number
CN102266924A
CN102266924A CN2011101913564A CN201110191356A CN102266924A CN 102266924 A CN102266924 A CN 102266924A CN 2011101913564 A CN2011101913564 A CN 2011101913564A CN 201110191356 A CN201110191356 A CN 201110191356A CN 102266924 A CN102266924 A CN 102266924A
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China
Prior art keywords
rolling
aluminum
melt
casting
aluminium
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CN2011101913564A
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Inventor
肖国华
崔巍
董江
余文福
万秀丽
熊增彩
张红安
蒋建平
索宝生
李春晖
赵国凯
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Aluminum Corp of China Ltd
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Aluminum Corp of China Ltd
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Priority to CN2011101913564A priority Critical patent/CN102266924A/en
Publication of CN102266924A publication Critical patent/CN102266924A/en
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Abstract

The invention relates to the aluminum processing industry, and in particular to a continuous cast-rolling process for producing a 5005 aluminum plastic strip billet. The continuous cast-rolling process adopts the following equipment: a heat preserving furnace, an aluminum melting furnace, an on-line refining device, a two-stage filter set and a continuous cast-rolling set. The continuous cast-rolling process comprises the following steps: (1) blending materials; (2) charging; (3) melting and stirring; (4) removing slags and performing sampling analysis; (5) degassing and refining, standing and performing heat preservation; (6) performing on-line melt treatment; (7) continuously cast-rolling; (8) coiling and shearing; and (9) inspecting. The continuous cast-rolling process has the advantages that as an electrolytic aluminum liquid with the concentration of 80% is adopted during the production process, the burn out rate of aluminum is lowered to below 1.5% and the unit consumption of natural gas is lowered to below 80Nm<3>/tAl, and the burn out rate and energy consumption of the aluminum are lowered by 50% compared with the cast-rolling method for producing a 3005 aluminum plastic strip billet using a re-melting aluminum ingot; and the finished product ratio reaches over 99%. The continuous cast-rolling process for producing the 5005 aluminum plastic strip billet is applicable to the aluminum and aluminum alloy casting industry at home and abroad.

Description

A kind of continuous casting and rolling technology of production 5005 plastic-aluminum band blanks
Technical field
The present invention relates to the aluminium processing industry, specifically relate to a kind of continuous casting and rolling technology of production 5005 plastic-aluminum band blanks.
Background technology
5005 domestic plastic-aluminum bands generally adopt cast-rolling stock, and final rolling thickness is generally the product greater than 0.2mm.The production method of its cast-rolling stock is: allow aluminium liquid be directed between two rolls by a covering device and form in " roll gap ", after cooling by force, crystallization and the distortion by two rolls, obtaining thickness is the casting volume base of 6mm~8mm.In strip casting process, be subjected to the rapid cooling of two rolls in the narrower roll gap of aluminium liquid between two rolls and crystallization, blank after solidifying is subjected to two rolls rolling deformation to a certain degree simultaneously, and the interior tissue of resulting casting plate belongs to half as-cast structure, and the directionality of crystal is stronger.
The drawback of above technology is mainly:
1. for increasing active nucleus, need remelting aluminium ingot refuse;
2. the scaling loss of aluminium is bigger, is generally 30 ‰;
3. in the production process, energy consumption is than higher, and general natural gas unit consumption is 150Nm 3/ tAl;
4. production efficiency is lower, the cost height.
Summary of the invention
The technical problem to be solved in the present invention is a deficiency at needing in the present 5005 plastic-aluminum band production methods that remelting is bigger with the scaling loss of aluminium ingot refuse, aluminium, the high existence of energy consumption, provide a kind of on two driving tilting continuous castings the continuous casting and rolling technology of production 5005 plastic-aluminum band blanks.
The continuous casting and rolling technology of a kind of production of the present invention 5005 plastic-aluminum band blanks is achieved by following technical proposals: a kind of continuous casting and rolling technology of production 5005 plastic-aluminum band blanks comprises the holding furnace that is used for production method, molten aluminium stove, refine on line device, double-stage filtering item, continuous casting and rolling unit, and the continuous casting and rolling technology of described plastic-aluminum band blank comprises the steps:
1) batching step is meant the control requirement according to 5005 aluminum alloy chemically compositions, by 80% electrolytic aluminium liquid (Al99.70 purity)+20% cold burden (intermediate alloy or metallic addition, remelting aluminium ingot Al99.70, the casting waste material of 5005 alloys or the 5005 alloy risers piece of releasing) is made into the process (solid material ratio>90%) of furnace charge;
2) shove charge step is meant pack into the successively process of molten aluminium stove of the furnace charge that will prepare;
3) fusing, whipping step are meant and treat that furnace charge stays, and manually evenly spread coverture to the furnace charge surface, for quickening the furnace charge fusing, guarantee the temperature and the homogeneity of ingredients of aluminum melt, start the process that the permanent magnetism agitating device stirs melt;
4) skim, the sample analysis step is meant and treats that melting finishes, when melt temperature reaches requirement, to the melt rapid analysis of skimming, take a sample, and the chemical analysis of aluminium liquid is adjusted (watering down or feed supplement) according to analysis result, treat that the qualified back of melt analysis of components is by the process of chute metaideophone to holding furnace;
5) degasification refining, leave standstill, incubation step is meant converter time ≯ 25min, the aluminum melt converter finishes, adjust the aluminum melt temperature to meeting (usually at 710~720 ℃) after the technological requirement, adjust the nitrogen valve of furnace bottom scavenger system, the air blowing brick that nitrogen process holding furnace furnace bottom is provided with is to the aluminum melt degassing refining, refining time generally needs 15~20min, melt after the refining must leave standstill processing (time 〉=15 minute), claw scum silica frost, sprinkle one deck coverture (consumption is generally the 1kg/t furnace charge) again, adjust the process of melt temperature to casting temperature, preparation casting;
6) online melt treatment step is meant in the strip casting process, and aluminum melt is through wire-feed motor on-line continuous feeding AlTi5B1 round bar (specification Ф 9.5mm) crystal grain thinning, through the process of online depassing unit, the degasification of the ceramic wafer filter degree of depth, refining and filtration;
7) the continuous casting and rolling step is meant that the melt after the online melt treatment enters the preceding case of double-roll type continuous casting and rolling, enters casting roller cooling and rolling by lip, and according to the roll casting speed of technological requirement, continuous casting and rolling becomes the process of made-up belt;
8) batch, shear step and be meant roll casting sheet, cut off with cutter when the roll casting sheet of rolling is treated to the volume weight of setting, unload volume fast, tie and weigh, winch to roll casting sheet and deposit test zone process to be checked by coil stripping car through the coiling machine rolling;
9) check that step is meant according to industry standard or customer requirements, check the cast strip quality; Cast strip after qualified on inspection transports the cold rolling workshop of this engineering to or sells outward.
Described batching step, in the process of feeding intake, the little lump waste materials of Ying Xianjia, after add casting waste material, remelting aluminium ingot, at last electrolytic aluminium liquid is injected the forehearth of molten aluminium stove by the platform bag, enter molten aluminium stove by the forehearth metaideophone again, at temperature of aluminum liquid between 720~740 ℃, add the interpolation of intermediate alloy and metal and prepare burden, after batching is finished, should leave standstill 20min.
Described molten aluminium stove, holding furnace, refine on line device, double-stage filtering item, continuous casting and rolling unit communicate mutually by chute, guarantee the continuous operation of casting and rolling production process streamline.
Tilt to pour out melt when described holding furnace is produced, melt just flows into a procedure together in downstream constantly like this.
Its process conditions are:
1) melting and converter requirement
Batching: electrolytic aluminium water ratio is by being no more than 80% control (the production initial stage should suitably increase the additional proportion of cold burden);
Composition: Fe0.35~0.55%, Mg0.7~0.9%, Si≤0.15%, Cu, Mn, Cr≤0.1%, Ti≤0.05%, annotate: Li≤0.0002%, Na≤0.0005%, As≤0.01%, the content of heavy metal and poisonous element lead, arsenic, cadmium etc. is all less than 0.01%;
Melt temperature: molten aluminium stove temperature of aluminum liquid≤760 ℃, holding furnace temperature of aluminum liquid≤745 ℃, the holding furnace temperature satisfies to produce by low control as far as possible is advisable;
The melt refining:
The molten aluminium stove of l adopts no sodium type refining agent, carries out injection refining by 2kg/ ton aluminium refining agent, refining time 〉=15 minute;
The l ordinary production does not allow to stir, the clear holding furnace of heat, shuts down the back holding furnace is carried out hot prepurging;
Converter requires:
The converter chute uses undercurrent baffle plate, glass wool cloth baffle plate during the l converter;
When l prepares the beginning converter, the main behaviour of table vice-monitor (or converter personnel) announcement machine row, main behaviour is responsible for the holding furnace air brick is made as the automated cleaning state by the machine row.1# ~ 5# flow is made as 12L/min, and the 6# flow is 9L/min, and the air brick working time is made as 60min, after converter is finished air brick is closed;
L shortens the converter time as far as possible, guarantees the chute level stability in the converter process;
After the l converter, converter personnel skim to holding furnace, do not allow significantly to stir aluminium liquid in the holding furnace;
2) degassing and filtration
Remove steam stove: process gas: argon gas requires no thick scum silica frost;
The titanium silk requires: homemade titanium silk (AL-5Ti-1B), and titanium silk speed can be calculated according to product specification, belt speed; According to knowhow, ton aluminium adds aluminium titanium boron wire 2kg, and computational methods: per minute milling train throughput calculates the speed of titanium silk machine: thickness of slab * plate is wide * and belt speed * 2.7 * 0.000001(kg/min); Aluminium titanium boron wire mainly plays the crystal grain thinning effect;
Filter:
The homemade 40ppi filter of l single-stage;
L filter liquid level difference≤20MM and throughput≤200T;
L will guarantee not have the aluminium of coagulating and obviously slagging scorification in the Rose Box when filter is installed;
Do not allow collision in the l production process, knock Rose Box, scrape the behavior that filter etc. has influence on filter capacity;
Use the chute screen pack to filter at holding furnace outlet, movable chute place during the l ordinary production.
3) technological parameter requirement
Cast strip speed (mm/min): 800 ± 50
Preceding oven temperature, degree (℃): 705~710
Casting section length :≤65mm
Roll roll surface temperature: top roll (270 0): 75~85 ℃, lower roll (90 0): 110~120 ℃
Cooling water parameter: cooling water temperature set with on guaranteeing/the lower roll roll surface temperature is as the criterion.
4) plate shape requirement
L thickness of slab 7.5 ± 0.3mm, the thick 0~0.040mm that differs from both sides, camber 0~0.80%, vertical thick poor≤0.10mm;
L cuts survey girth sample before being rolled into product, measures three points (being adjusted to the involute finished product of technological requirement scope) with water cooling;
L the 1st volume end of reel is sheared the girth sample, and per afterwards 20 volumes are sheared 1 girth sample; Find in the production process need in time get the girth sample when plate shape is unusual;
L tuned plate shape part coiled material must be cut useless, must cut after the adjustment and survey the girth sample.
5) quality requirement
Do not have obviously organize striped, significantly band, obviously oxide-film, black patch are pressed into, monolateral portion does not allow to surpass the as-cast structure (after the pickling) of 40mm and greater than the technology raw edges of 15mm, crystal grain A level.
6) control point
It is lubricated that l production process up-down rollers both sides portion increases little firelock, avoids the roll banding phenomenon;
L reduces the flame-spraying amount as far as possible under the prerequisite of roll banding not, avoid the generation of plate face carbon ash striped;
The control of l online production technological parameter must be controlled in the claimed range, and preceding oven temperature, degree keeps relative steady state;
L finished product volume mushroom sample sample point should export threeway chute place at Rose Box, does not allow in movable chute sampling, and sampling needs with special-purpose sampling mould;
Can strengthen the flame-spraying amount before the l shear or suitably reduce window of web velocities, spray one to two roller Zhou Houzai shear, with anti-sticking roller, band enters spool, after tension force is normal, recovers normal quantity for spray;
The l coiling machine adopts the tension gradient pattern, and gradient is set by 10%.
The continuous casting and rolling process of a kind of production of the present invention 5005 plastic-aluminum band blanks has following beneficial effect compared with prior art: process of the present invention is on two driving continuous casting and rolling units, the 5005 plastic-aluminum band blank quality of producing reach YS/T90-2008 aluminium and aluminium alloy cast strip standard, and can be rolled down to 0.2mm thickness in downstream producer, owing to adopt 80% electrolytic aluminium liquid in the production process, the scaling loss of aluminium is reduced to below 15 ‰, and the natural gas unit consumption is reduced to 80Nm 3Below/the tAl, compare with the casting and roll process that adopts remelting to produce 5005 plastic-aluminum band blanks with aluminium ingot, the scaling loss of aluminium and energy consumption all reduce by 50%; Because the present invention rationally adopts melt quality control technology, casting-rolling technology technology, the 5005 plastic-aluminum band blanks of producing do not have obviously organizes mass defects such as striped, tangible band, obvious oxide-film, black patch are pressed into, improved the finished product rate, the finished product rate reaches more than 99%; The optimization of online depassing unit parameter and equipment, degassing efficiency surpasses 50%.The continuous casting and rolling process of a kind of production of the present invention 5005 plastic-aluminum band blanks is applicable to domestic and international aluminium and aluminium alloy casting industry.
Description of drawings
The continuous casting and rolling technology of a kind of production of the present invention 5005 plastic-aluminum band blanks has following accompanying drawing:
Fig. 1 is the continuous casting and rolling process chart of a kind of production of the present invention 5005 plastic-aluminum band blanks;
Fig. 2 arranges schematic diagram for the continuous casting and rolling technology casting and rolling installation of a kind of production of the present invention 5005 plastic-aluminum band blanks;
Fig. 3 is the molten aluminium stove of continuous casting and rolling technology, the holding furnace drying out curve of a kind of production of the present invention 5005 plastic-aluminum band blanks.
Wherein: 1, holding furnace; 2, molten aluminium stove; 3, refine on line device; 4, double-stage filtering item; 5, continuous casting and rolling unit.
The specific embodiment
Be further described below in conjunction with the continuous casting and rolling process technology scheme of drawings and Examples a kind of production of the present invention 5005 plastic-aluminum band blanks.
As shown in Figure 1-Figure 3, the continuous casting and rolling technology of a kind of production of the present invention 5005 plastic-aluminum band blanks comprises the holding furnace 1 that is used for production method, molten aluminium stove 2, refine on line device 3, double-stage filtering item 4, continuous casting and rolling unit 5, and the continuous casting and rolling technology of described plastic-aluminum band blank comprises the steps:
1) batching step is meant the control requirement according to 5005 aluminum alloy chemically compositions, by 80% electrolytic aluminium liquid (Al99.70 purity)+20% cold burden (intermediate alloy or metallic addition, remelting aluminium ingot Al99.70, the casting waste material of 5005 alloys or the 5005 alloy risers piece of releasing) is made into the process (solid material ratio>90%) of furnace charge;
2) shove charge step is meant pack into the successively process of molten aluminium stove 2 of the furnace charge that will prepare;
3) fusing, whipping step are meant and treat that furnace charge stays, and manually evenly spread coverture to the furnace charge surface, for quickening the furnace charge fusing, guarantee the temperature and the homogeneity of ingredients of aluminum melt, start the process that the permanent magnetism agitating device stirs melt;
4) skim, the sample analysis step is meant and treats that melting finishes, when melt temperature reaches requirement, to the melt rapid analysis of skimming, take a sample, and the chemical analysis of aluminium liquid is adjusted (watering down or feed supplement) according to analysis result, treat that the qualified back of melt analysis of components is by the process of chute metaideophone to holding furnace 1;
5) degasification refining, leave standstill, incubation step is meant converter time ≯ 25min, the aluminum melt converter finishes, adjust the aluminum melt temperature to meeting (usually at 710~720 ℃) after the technological requirement, adjust the nitrogen valve of furnace bottom scavenger system, the air blowing brick that nitrogen process holding furnace 1 furnace bottom is provided with is to the aluminum melt degassing refining, and refining time generally needs 15~20min.Melt after the refining must leave standstill processing (time 〉=15 minute), claws scum silica frost, sprinkles one deck coverture (consumption is generally the 1kg/t furnace charge) again, adjust melt temperature to the casting temperature, prepare the process of casting;
6) online melt treatment step is meant in the strip casting process, and aluminum melt is through wire-feed motor on-line continuous feeding AlTi5B1 round bar (specification Ф 9.5mm) crystal grain thinning, through the process of online depassing unit, the degasification of the ceramic wafer filter degree of depth, refining and filtration;
7) the continuous casting and rolling step is meant that the melt after the online melt treatment enters the preceding case of double-roll type continuous casting and rolling, enters casting roller cooling and rolling by lip, and according to the roll casting speed of technological requirement, continuous casting and rolling becomes the process of made-up belt;
8) batch, shear step and be meant roll casting sheet, cut off with cutter when the roll casting sheet of rolling is treated to the volume weight of setting, unload volume fast, tie and weigh, winch to roll casting sheet and deposit test zone process to be checked by coil stripping car through the coiling machine rolling;
9) check that step is meant according to industry standard or customer requirements, check the cast strip quality; Cast strip after qualified on inspection transports the cold rolling workshop of this engineering to or sells outward.
Described batching step, in the process of feeding intake, the little lump waste materials of Ying Xianjia, after add casting waste material, remelting aluminium ingot, at last electrolytic aluminium liquid is injected the forehearth of molten aluminium stove 2 by the platform bag, enter molten aluminium stove 2 by the forehearth metaideophone again, at temperature of aluminum liquid between 720~740 ℃, add the interpolation of intermediate alloy and metal and prepare burden, after batching is finished, should leave standstill 20min;
Described holding furnace 1, molten aluminium stove 2, refine on line device 3, double-stage filtering item 4, continuous casting and rolling unit 5 communicate mutually by chute, guarantee the continuous operation of casting and rolling production process streamline.
Described holding furnace 1 tilts to pour out melt when producing, melt just flows into a procedure together in downstream constantly like this.
Its process conditions are:
1) melting and converter requirement
Batching: electrolytic aluminium water ratio is by being no more than 80% control (the production initial stage should suitably increase the additional proportion of cold burden);
Composition: Fe0.35~0.55%, Mg0.7~0.9%, Si≤0.15%, Cu, Mn, Cr≤0.1%, Ti≤0.05%, annotate: Li≤0.0002%, Na≤0.0005%, As≤0.01%, the content of heavy metal and poisonous element lead, arsenic, cadmium etc. is all less than 0.01%;
Melt temperature: molten aluminium stove 2 temperature of aluminum liquid≤760 ℃, holding furnace 1 temperature of aluminum liquid≤745 ℃, holding furnace 1 temperature satisfy to produce by low control as far as possible is advisable;
The melt refining:
The molten aluminium stove of l adopts no sodium type refining agent, carries out injection refining by 2kg/ ton aluminium refining agent, refining time 〉=15 minute;
The l ordinary production does not allow to stir, the clear holding furnace 1 of heat, shuts down the back holding furnace 1 is carried out hot prepurging;
Converter requires:
The converter chute uses undercurrent baffle plate, glass wool cloth baffle plate during the l converter;
When l prepares the beginning converter, the main behaviour of table vice-monitor (or converter personnel) announcement machine row, main behaviour is responsible for holding furnace 1 air brick is made as the automated cleaning state by the machine row.1# ~ 5# flow is made as 12L/min, and the 6# flow is 9L/min, and the air brick working time is made as 60min, after converter is finished air brick is closed;
L shortens the converter time as far as possible, guarantees the chute level stability in the converter process;
After the l converter, the converter personnel skim to holding furnace 1, do not allow significantly to stir aluminium liquid in the holding furnace 1;
2) degassing and filtration
Remove steam stove: process gas: argon gas requires no thick scum silica frost;
The titanium silk requires: homemade titanium silk (AL-5Ti-1B), and titanium silk speed can be calculated according to product specification, belt speed; According to knowhow, ton aluminium adds aluminium titanium boron wire 2kg, and computational methods: per minute milling train throughput calculates the speed of titanium silk machine: thickness of slab * plate is wide * and belt speed * 2.7 * 0.000001(kg/min); Aluminium titanium boron wire mainly plays the crystal grain thinning effect;
Filter:
The homemade 40ppi filter of l single-stage;
L filter liquid level difference≤20MM and throughput≤200T;
L will guarantee not have the aluminium of coagulating and obviously slagging scorification in the Rose Box when filter is installed;
Do not allow collision in the l production process, knock Rose Box, scrape the behavior that filter etc. has influence on filter capacity;
Use the chute screen pack to filter at holding furnace outlet, movable chute place during the l ordinary production.
3) technological parameter requirement
Cast strip speed (mm/min): 800 ± 50
Preceding oven temperature, degree (℃): 705~710
Casting section length :≤65mm
Roll roll surface temperature: top roll (270 0): 75~85 ℃, lower roll (90 0): 110~120 ℃
Cooling water parameter: cooling water temperature set with on guaranteeing/the lower roll roll surface temperature is as the criterion.
4) plate shape requirement
L thickness of slab 7.5 ± 0.3mm, the thick 0~0.040mm that differs from both sides, camber 0~0.80%, vertical thick poor≤0.10mm;
L cuts survey girth sample before being rolled into product, measures three points (being adjusted to the involute finished product of technological requirement scope) with water cooling;
L the 1st volume end of reel is sheared the girth sample, and per afterwards 20 volumes are sheared 1 girth sample; Find in the production process need in time get the girth sample when plate shape is unusual;
L tuned plate shape part coiled material must be cut useless, must cut after the adjustment and survey the girth sample.
5) quality requirement
Do not have obviously organize striped, significantly band, obviously oxide-film, black patch are pressed into, monolateral portion does not allow to surpass the as-cast structure (after the pickling) of 40mm and greater than the technology raw edges of 15mm, crystal grain A level.
6) control point
It is lubricated that l production process up-down rollers both sides portion increases little firelock, avoids the roll banding phenomenon;
L reduces the flame-spraying amount as far as possible under the prerequisite of roll banding not, avoid the generation of plate face carbon ash striped;
The control of l online production technological parameter must be controlled in the claimed range, and preceding oven temperature, degree keeps relative steady state;
L finished product volume mushroom sample sample point should export threeway chute place at Rose Box, does not allow in movable chute sampling, and sampling needs with special-purpose sampling mould;
Can strengthen the flame-spraying amount before the l shear or suitably reduce window of web velocities, spray one to two roller Zhou Houzai shear, with anti-sticking roller, band enters spool, after tension force is normal, recovers normal quantity for spray;
The l coiling machine adopts the tension gradient pattern, and gradient is set by 10%.
Embodiment 1.
The continuous casting and rolling technology of producing 3005 plastic-aluminum band blanks comprises the steps:
1, smelting technology step:
1.1. the preparation of molten aluminium stove 2
The A baker: newly molten aluminium stove 2, in, the back molten aluminium stove 2 of overhaul, carry out baker by drying out curve, to drive moisture, guarantee the service condition of stove, the general baker cycle is 32 days, connects the combustion tube moisture that looses over preceding 5 days being, drying out curve as shown in Figure 3.
The B prepurging: the off-grade metal composition and the slag removal that will remain in the molten bath are clean in order to avoid cause alloy pollution in the stove; Newly repair, overhaul, in repair and the prepurging material of long-term blowing out and alloy conversion back prepurging can use the one-level waste material of primary aluminum or fine aluminium, prepurging material amount must not be less than 40% of furnace capacity, aluminium liquid must emptying and carry out big prepurging in the prepurging forehearth, adding behind the prepurging material also must emptying and carry out big prepurging, and the melt temperature during prepurging is controlled at 780-820 ℃, thoroughly stirs three times, each mixing chamber interval is half an hour, at last, chemical composition analysis is made in the sampling of prepurging material.
The C prepurging: it is outer to guarantee fire cleaning after each converter is intact residual slag in the stove thoroughly to be come out of the stove clearly, slag appears in fusion process, through after skimming, also can be adsorbed on furnace bottom and the furnace wall, occupied a large amount of capacity of stove after accumulating over a long period, cause the minimizing of inventory, a large amount of slags pollutes the Al melt, has improved the scaling loss of natural gas, has strengthened the possibility that various pernicious gases exist, so necessary prepurging, the requirement of prepurging:
1) during alloy commentaries on classics group, the big prepurging of Ying Fanggan;
When 2) producing continuously, big prepurging behind every production 10 heats;
3) for particular product, every heat all will be put and do big prepurging, and leads the stokehold at following heat and carry out the secondary prepurging.
The method of prepurging: liquid in the stove is thoroughly put dried, is treated in the stove that temperature reduces to the people can enter the time, use instruments such as crowbar, pneumatic pick with the bits at furnace wall, chimney corner, furnace bottom, burner place, flue place and other booties thoroughly shovel fall, and clean out with spade.
1. 2. get the raw materials ready
According to technological requirement, aluminium ingot, waste material, electrolytic aluminium water etc. are carried out amount of plan by product specification, the solid material is by 25%~30%, and electrolytic aluminium water is by 70%~75%, according to knowhow, cause burning for preventing aluminium liquid long-time stop in stove, cause that sheet material crystal grain is thick, advise that therefore plate is wide below 1400mm (thickness of slab 7.5mm usually), the pan feeding overall control is at 12~14 tons, plate is wide more than 1400mm, and feeding is controlled at 18~20 tons.
1. 3. feed intake
The material of getting ready is put in the molten aluminium stove,, when shove charge, adorned cobbing earlier in order to reduce scaling loss, back dress thin plate waste material, the dress aluminium ingot adds electrolytic aluminium water at last.
1. 4. fusings (igniting-truce)
Need guarantee the continuity that casting is produced the duration of ignition, guarantee that simultaneously aluminium water reduced as far as possible in the molten aluminium stove time of staying, ignition method is that thermoinduction is lighted a fire automatically, ceases fire when temperature reaches design temperature in the stove.
The fusing point of aluminium is 660 ℃, but guarantee the stove melting rate and do not influence under the prerequisite of production to reduce smelting temperature as far as possible, generally is controlled at about 760 ℃.
1. 5. prepare burden
Chemical composition according to chemical composition in the primary aluminum and product requires:
Fe0.35~0.55%,Mg0.7~0.9%,Si≤0.15%,Cu、Mn、Cr≤0.1%,Ti≤0.05%,
Annotate: Li≤0.0002%, Na≤0.0005%, As≤0.01%, the content of heavy metal and poisonous element lead, arsenic, cadmium etc. is all less than 0.01%
Determine the addition of additive, intermediate alloy, the addition of additive, intermediate alloy will be considered its casting yield and the content of chemical element in alloy.
1. 6. stir
Carry out physical agitation with permanent magnetic stirrer, to obtain uniform chemical composition, quicken fusion process, producing needs in case of necessity also using artificial stirring, even fully until chemical composition.
1. 7. sample analysis
Do not get three mushroom samples in 1/2nd punishment in stove gate both sides and middle molten bath, be sent to central laboratory and carry out chemical composition analysis, until being consistent with the chemical composition that requires.
1. 8. refinings
After treating that chemical composition is qualified, with the ratio of 2 kilograms of melts per ton it is carried out refining, the time is 〉=20 minutes.
1. 9. skim
Skim to melt in the qualified fully and intact back of refining when the chemical composition of melt, use forklift for slag or manually aluminium liquid surface scum in the stove is clawed.
1.10. converter
Melt temperature in the molten aluminium stove 2 reaches 745 ℃, and (temperature of aluminum liquid of molten aluminium stove 2 exceeds about 10 ℃ than holding furnace aluminium 1 liquid temp generally speaking, but can not be lower than 705 ℃ in emergency) time melt that will melt in the aluminium stove 2 change in the holding furnace 1, this process strictness is undertaken by technological temperature, and should shorten the converter time as far as possible and guarantee the stable of preceding case liquid level when converter;
During converter, the first six baffle plate and glass wool cloth screen pack are placed in the chute position of regulation, aluminum melt is carried out a grade slag, filtration, open the stove eye and go to holding furnace 1 according to the aluminium liquid that the method for " earlier thin back big " will melt in the aluminium stove 2 through chute, the temperature of aluminum liquid during this should be controlled at 720~750 ℃.
2, casting part
2.1 riser operation
2.1.1 preparation before the riser
Whether the various piece and the system of A, inspection machine row be normal, whether can satisfy our ordinary production needs;
Aluminium liquid measure in B, the inspection holding furnace 1 and temperature of aluminum liquid (750-760 ℃ is good, and this value is actual measured value);
Whether C, checking tool complete (comprising various slag casees, besom, spade, sand paper or the like);
D, check the temperature setting of degasification tank, Rose Box, in the time of no matter how many its temperature settings is will guaranteeing to run slag before the temperature of case be between 730-740 ℃;
E, the state of mind of checking each post personnel and the situation that puts in place;
F, lip hung out be installed on the platform, the horizontal and vertical position of adjusting lip is until reaching suitable gap and casting section length;
G, main behaviour's debugging current stabilization and flow control device;
Stress and formation one deck carbon-coating that H, breaker roll toast to reduce roll fully with flame-spraying prevent roll banding.
2.1.2 release
A, after preparation is finished, the personnel division of labor enters post separately;
B, open each import and export, set the chute liquid level, holding furnace 1 begins to fascinate;
C, allow aluminium liquid by the chute of releasing, the preheating chute and before case.
2.1.3 riser
A, the speed of rolls are set between the 1500-2000mm/min, are generally 1800~1900mm/min;
B, when temperature of aluminum liquid reaches 730-740 ℃ and when stablize, pull out preceding case plug and begin to run slag;
C, observe distribution situation and the crystallization situation of aluminium liquid in the middle of roll gap, case liquid level and roll linear velocity before adjusting up to complete band occurring, are used clean rag this moment and are wiped clean sticking aluminium and foreign material on the roll;
D, when running slag, begin ejecting plate, when underspeeding and in time adjust preceding case liquid level to suitable degree;
E, cut unnecessary out-of-flatness band part until batching, should in time measure the wide and thickness of slab of plate this moment and in time adjust when band arrives the scissors place;
F, start paint finishing and adjust quantity for spray (guarantee to open little quantity for spray under the prerequisite of roll banding not as far as possible), spacing and speed;
G, when adjusting template, open titanium silk machine and start depassing unit;
H, after all are finished, cut waste product, batch finished product.

Claims (7)

1. continuous casting and rolling technology of producing 5005 plastic-aluminum band blanks, comprise the holding furnace (1) that is used for process, molten aluminium stove (2), refine on line device (3), double-stage filtering item (4), continuous casting and rolling unit (5), it is characterized in that described method comprises the steps:
1) batching step is meant the control requirement according to 5005 aluminum alloy chemically compositions, carries out the process of proportioning by 80% electrolytic aluminium liquid (Al99.70 purity)+20% cold burden;
2) shove charge step is meant pack into the successively process of molten aluminium stove (2) of the furnace charge that will prepare;
3) fusing, whipping step are meant and treat that furnace charge stays, and manually evenly spread coverture to the furnace charge surface, for quickening the furnace charge fusing, guarantee the temperature and the homogeneity of ingredients of aluminum melt, start the process that the permanent magnetism agitating device stirs melt;
4) skim, the sample analysis step is meant and treats that melting finishes, when melt temperature reaches requirement, to the melt rapid analysis of skimming, take a sample, and the process of the chemical analysis of aluminium liquid being adjusted according to analysis result;
5) degasification refining, leave standstill, incubation step is meant the nitrogen valve of adjusting the furnace bottom scavenger system, the air blowing brick that nitrogen is provided with through the holding furnace furnace bottom is to the aluminum melt degassing refining, refining time generally needs 15~20min; Melt after the refining must leave standstill processing (time 〉=15 minute), claws scum silica frost, sprinkles one deck coverture (consumption is generally the 1kg/t furnace charge) again, adjust melt temperature to the casting temperature, prepare the process of casting;
6) online melt treatment step is meant in the strip casting process, and aluminum melt is through wire-feed motor on-line continuous feeding AlTi5B1 round bar (specification Ф 9.5mm) crystal grain thinning, through the process of online depassing unit, the degasification of the ceramic wafer filter degree of depth, refining and filtration;
7) the continuous casting and rolling step is meant that the melt after the online melt treatment enters the preceding case of double-roll type continuous casting and rolling, enters casting roller cooling and rolling by lip, and according to the roll casting speed of technological requirement, continuous casting and rolling becomes the process of made-up belt;
8) batch, shear step and be meant roll casting sheet, cut off with cutter when the roll casting sheet of rolling is treated to the volume weight of setting, unload volume fast, tie and weigh, winch to roll casting sheet and deposit test zone process to be checked by coil stripping car through the coiling machine rolling;
9) check that step is meant according to industry standard or customer requirements, check the cast strip quality, the cast strip after qualified on inspection transports the cold rolling workshop of this engineering to or sells outward;
Its process conditions are:
1) melting and converter requirement
Batching: electrolytic aluminium water ratio is by being no more than 80% control (the production initial stage should suitably increase the additional proportion of cold burden);
Composition: Fe0.35~0.55%, Mg0.7~0.9%, Si≤0.15%, Cu, Mn, Cr≤0.1%, Ti≤0.05%, annotate: Li≤0.0002%, Na≤0.0005%, As≤0.01%, the content of heavy metal and poisonous element lead, arsenic, cadmium etc. is all less than 0.01%;
The melt refining:
Molten aluminium stove (2) adopts no sodium type refining agent, carries out injection refining by 2kg/ ton aluminium refining agent, refining time 〉=15 minute;
Converter requires:
The converter chute uses undercurrent baffle plate, glass wool cloth baffle plate during converter, and aluminum melt is carried out a grade slag, filtration;
When preparing the beginning converter, holding furnace (1) air brick is made as the automated cleaning state, the air brick working time is made as 60min, after converter is finished air brick is closed;
2) degassing and filtration
Remove steam stove: process gas: argon gas requires no thick scum silica frost;
The titanium silk requires: homemade titanium silk (AL-5Ti-1B), and titanium silk speed can be calculated according to product specification, belt speed; According to knowhow, ton aluminium adds aluminium titanium boron wire 2kg, and computational methods: per minute milling train throughput calculates the speed of titanium silk machine: thickness of slab * plate is wide * and belt speed * 2.7 * 0.000001(kg/min); Aluminium titanium boron wire mainly plays the crystal grain thinning effect;
Filter:
The homemade 40ppi filter of single-stage;
Filter liquid level difference≤20MM and throughput≤200T;
Will guarantee when filter is installed does not have the aluminium of coagulating and obviously slagging scorification in the Rose Box;
Use the chute screen pack to filter at holding furnace (1) outlet, movable chute place during ordinary production;
3) technological parameter requirement
Cast strip speed (mm/min): 800 ± 50
Preceding oven temperature, degree (℃): 695~702
Casting section length :≤65mm
Roll roll surface temperature: top roll (270 0): 75~85 ℃, lower roll (90 0): 110~120 ℃
Cooling water parameter: cooling water temperature set with on guaranteeing/the lower roll roll surface temperature is as the criterion;
4) plate shape requirement
Thickness of slab 7.5 ± 0.3mm, the thick 0~0.040mm that differs from both sides, camber 0~0.80%, vertical thick poor≤0.10mm;
Cut survey girth sample before being rolled into product, measure three points (being adjusted to the involute finished product of technological requirement scope) with water cooling;
The 1st volume end of reel is sheared the girth sample, and per afterwards 20 volumes are sheared 1 girth sample, finds in the production process need in time get the girth sample when plate shape is unusual;
Tuned plate shape part coiled material must be cut useless, must cut after the adjustment and survey the girth sample.
2. the continuous casting and rolling technology of a kind of production 5005 plastic-aluminum band blanks according to claim 1, it is characterized in that: described batching step, in the process of feeding intake, the little lump waste materials of Ying Xianjia, after add casting waste material, remelting aluminium ingot, at last electrolytic aluminium liquid is injected the forehearth of molten aluminium stove (2) by the platform bag, enter molten aluminium stove (2) by the forehearth metaideophone again, between 720~740 ℃, add the interpolation of intermediate alloy and metal and prepare burden at temperature of aluminum liquid, after batching is finished, should leave standstill 20min.
3. the continuous casting and rolling technology of a kind of production 5005 plastic-aluminum band blanks according to claim 1, it is characterized in that: described molten aluminium stove (2) temperature of aluminum liquid≤760 ℃, holding furnace (1) temperature of aluminum liquid≤745 ℃, holding furnace (1) temperature satisfy to produce by low control as far as possible is advisable.
4. the continuous casting and rolling technology of a kind of production 5005 plastic-aluminum band blanks according to claim 1 is characterized in that: described converter time ≯ 25min guarantees the chute level stability in the converter process.
5. the continuous casting and rolling technology of a kind of production 5005 plastic-aluminum band blanks according to claim 1 is characterized in that: described coiling machine adopts the tension gradient pattern, and gradient is set by 10%.
6. the continuous casting and rolling technology of a kind of production 5005 plastic-aluminum band blanks according to claim 1, it is characterized in that: described holding furnace (1), molten aluminium stove (2), refine on line device (3), double-stage filtering item (4), continuous casting and rolling unit (5) communicate mutually by chute, guarantee the continuous operation of casting and rolling production process streamline.
7. the continuous casting and rolling technology of a kind of production 5005 plastic-aluminum band blanks according to claim 1 is characterized in that: tilt to pour out melt when described holding furnace (1) is produced, melt just flows into a procedure together in downstream constantly like this.
CN2011101913564A 2011-07-09 2011-07-09 Continuous cast-rolling process for producing 5005 aluminum plastic strip billet Pending CN102266924A (en)

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Application publication date: 20111207