CN101269406A - Continuous casting technique for aluminum alloy thin belt blank - Google Patents
Continuous casting technique for aluminum alloy thin belt blank Download PDFInfo
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- CN101269406A CN101269406A CNA2008100980945A CN200810098094A CN101269406A CN 101269406 A CN101269406 A CN 101269406A CN A2008100980945 A CNA2008100980945 A CN A2008100980945A CN 200810098094 A CN200810098094 A CN 200810098094A CN 101269406 A CN101269406 A CN 101269406A
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Abstract
The invention discloses a continuous casting process of an aluminum thin billet, which is characterized in that the following steps are included: aluminum alloy ingots are preheated and are melted in a melting furnace in the role of a flux; before casting, a side closure system is preheated to 400-450 DEG C, when the temperature of a melting body ranges from 650 DEG C to 680 DEG C, the aluminum alloy ingots are arranged into a tundish for 15 to 30 minutes in the role of the flux, then through a flux distributing device, the aluminum alloy ingots flow into an equant vertical twin-roll thin strip billet continuous caster, with a left forging seam gap being 0 mm and maintaining the height of a melting pool between 90 mm and 340 mm, the casting is carried out in a sinking way; when in casting, the casting speed of the casting machine ranges from 20 to 120m/min, the thin strip blank is sent into a pinch roll after leaving a casting roller, and the forged aluminum alloy thin strip has a thickness between 1.0 mm and 3.5 mm. The continuous casting process can directly make aluminum alloy thin strip blank from the liquid aluminum alloy, the forged thin strip blank has good quality on the surface, and the internal organizational structure is uniform, thereby being conducive to succeeding rolling processes. The continuous casting process for an aluminum thin blank has short process and low cost.
Description
Technical field
The invention belongs to non-ferrous metal near net shape casting field, particularly a kind of continuous casting process of aluminium alloy strip.
Background technology
Aluminium alloy is a kind of light metal material, is present most widely used nonferrous materials, has higher specific strength, specific stiffness and excellent machinability, is widely used in fields such as Aero-Space, the vehicles and daily living articles.
The technological process of traditional aluminum alloy thin band production is: melting → ingot casting → homogenising → mill face → heating → hot rolling → cold rolling → finished products, and technological process is longer, and equipment investment is big.
Chinese patent CN1994620 discloses a kind of continuous casting system of foamed aluminium and the double-roller rolling technology that technology, CN1939610 and CN1995423 disclose a kind of aluminium alloy plate made-up belt.These disclosed patents all adopt horizontal twin-roll cast-rolling mill continuous casting aluminium alloy plate made-up belt.The horizontal dual roll casting machine schematic diagram of generally acknowledging is cast rollers 3 for two of the horizontal dual roll casting machine and is placed up and down as shown in Figure 1, by lip 1 aluminum alloy melt 2 is sent between the rotation casting roller of arranging up and down 3, enters condensing zone 4, and casting obtains strip base 5.Because the horizontal dual roll casting machine is by lip aluminum alloy melt to be sent between the rotation casting roller of arranging up and down, so alloy liquid is shorter with the contact zone of casting roller, is generally 15～40mm; Liquid level is lower, is generally 20mm; Casting speed is slower, generally between 0.8～1.5m/min.Though this technology is controlled easily, and can simplify traditional aluminum alloy thin band technological process of production, realize nearly end form processing and preparing aluminium alloy plate made-up belt, have intrinsic shortcoming: short contact zone makes the long cool time of formation needs of solidified shell; Horizontal double roller therapy emphasizes to cast the rolling effect of roller, requires to have certain rolling reduction; The cooling effect of up-down rollers is inconsistent, and the configuration of surface of condensing zone upper and lower surface liquid film is inconsistent, causes Cast Strip upper and lower surface quality and interior tissue inhomogeneous.Therefore, production efficiency is low, and the cooling velocity of aluminum alloy thin belt blank is slower, and strip tissue odds is even, and serviceability is not good, is unfavorable for directly carrying out follow-up rolling processing.
Summary of the invention
Purpose of the present invention provides a kind of casting technique of aluminum alloy thin belt blank.It can directly produce aluminum alloy thin belt blank from liquid aluminium alloy, the production efficiency height, and the strip base surface quality that casts out is good, and internal organizational structure is even, helps follow-up rolling processing.The present invention also has technological process short, the advantage that cost is low.
To achieve these goals, technical scheme of the present invention is: the continuous casting process of aluminum alloy thin belt blank, be to utilize isometrical vertical dual-roller conticaster of thin sheet billet to carry out strip base continuous casting, two casting rollers of described conticaster are to be horizontally disposed on same horizontal plane, and casting roller two ends have side seal system and casting roller to constitute the molten bath.。
Concrete grammar can be as follows: the aluminium alloy base in 100～300 ℃ of preheatings 10～30 minutes, under flux protection, is put into resistance melting furnace and carried out melting then; Melt temperature under flux protection, changes the tundish insulation over to and left standstill 15～30 minutes in the time of 650～680 ℃.
Casting roller both sides are used to form side seal system warm-up to 400～450 ℃ in molten bath, the pre-thermal recovery electrical heating of side seal system or the mode of flame heat before the casting.The material of side seal system selects for use itself and aluminium alloy melt to have the material good physical chemical compatibility, that heat-insulating property is good, that wearability is good, the asbestos board that the material of side seal of the present invention system adopts the asbestos product factory, Chongqing to produce.
Hydraulic system by being used to control roll gap in the isometrical vertical dual-roller conticaster of thin sheet billet makes the casting roller reserve roll gap near 0mm the contact of two casting roller roll surfaces.Aluminium alloy melt after will leaving standstill then enters isometrical vertical double-roller continuous casting machine by flow distribution device, and keeping melt pool height by the control melt flow is 90～340mm.Cast with the mode of slipping into below the liquid level in the flow distribution device outlet insertion molten bath, the delivery port of flow distribution device is lower than bath surface, can make bath surface steady.The casting speed of casting machine is 20～120m/min during casting, and the strip base enters pinch roll after leaving the casting roller, and the aluminum alloy thin tape thickness that casts out is 1.0～3.5mm.
The effect of flow distribution device is to make flow field and the temperature field of melt in the molten bath even, material has good physical chemical compatibility, the good material of heat-insulating property with aluminium alloy melt, the high alumina lip that flow distribution device material of the present invention adopts the asbestos product factory, Chongqing to produce.
The coupling mechanism force of regulator solution pressing system is with the thickness of control aluminium alloy strip.Its method is at first to preset the hydraulic system coupling mechanism force, increase gradually at casting beginning back separating force, up to the coupling mechanism force balance.At this moment, Cast Strip thickness is constant.Preset coupling mechanism force and increase, Cast Strip thickness reduces; Preset coupling mechanism force and reduce, Cast Strip thickness increases.Cast roller and be set to 0 roll gap, in the casting process, melt can be full of the molten bath very soon, and the casting roller of rotation is successfully sent the aluminium alloy strip, makes casting smooth.
The effect of pinch roll be for prevent aluminum alloy thin belt blank when just leaving the casting roller because of the lower broken belt easily of intensity.
The casting roller diameter of the used isometrical vertical dual-roller conticaster of thin sheet billet of the present invention is 250～1000mm, and width is 150～1000mm.Its inner cooling circulating water that feeds makes the cooling effect of casting roller good, and the casting roll material is stainless steel or copper alloy, can guarantee that the cooling velocity of strip reaches 200-300 ℃/s.
Adopt process conditions of the present invention, the melt pool height that liquid aluminium alloy is formed between the casting roller is 90～340mm, helps the even mixing of the aluminium alloy melt in the molten bath.
The present invention is with the difference of horizontal double roller continuous casting technology: the modes of emplacement of casting roller is different.Cast the roller horizontal positioned at grade for two of the present invention, the aluminum alloy melt of fusing forms the molten bath by flow distribution device, and aluminum alloy melt contacts with the casting roller and forms condensing zone, obtains the strip base.The vertical double roller continuous casting technology that the present invention adopts, bath surface is higher, when the casting roller diameter is
During 300mm, its liquid level can reach 100mm.At this moment, because the formation in vertical pair of roller molten bath makes alloy liquid longer with the contact zone of casting roller, the contact zone of alloy liquid and casting roller is about 200mm, and it is longer to effective cooling distance of alloy liquid therefore to cast roller, has improved the heat-transfer effect of casting roller to melt.Long cooling distance helps to obtain the rapid solidification tissue, thereby improves the Cast Strip performance.
Because two of vertical double-roller continuous casting machine casting roller horizontal positioned, two casting rollers to the cooling of aluminium alloy liquid symmetrically, the configuration of surface unanimity of condensing zone liquid film, therefore the Cast Strip base even tissue that forms is favourable to following process.Higher molten bath helps the mixing of melt in the molten bath, has improved the uniformity of Temperature Distribution.
Technology of the present invention is crystal grain thinning and improve alloy organizing well, and in vertical double roller continuous casting Solidified Process of Aluminum Alloys, because the cooldown rate height, degree of supercooling increases, and the nucleation rate increase diminishes crystal grain.The degree of supercooling increase makes in the process of setting atom diffusion be suppressed, and crystal grain can not be grown up fully.So the aluminium alloy strip comprehensive mechanical property that the inventive method obtains is higher.
Adopt vertical twin-roll thin strip continuous casting explained hereafter aluminum alloy thin belt blank, can improve the casting rate of aluminum alloy thin belt blank, the production efficiency height, the strip base surface quality that casts out is good, and internal organizational structure is even, helps follow-up rolling processing.The tissue that the energy acquisition has the rapid solidification effect, the Cast Strip has good performance.
The present invention utilizes vertical double roller continuous casting technology, can omit ingot casting → homogenising in the technological process of traditional aluminum alloy thin band production → mill face → hot rolling → cold rolling pilot process that waits, obtain product near final use shape, can save processing cost and raw material, realize the nearly end form shaping processing of product, making aluminium alloy is the strip base by liquid direct forming, so technological process is short, and cost is low.
The present invention can be applicable to directly carry out on-line rolling, and the band after rolling is the strip material of function admirable.
Description of drawings
Fig. 1 is a horizontal double roller continuous casting schematic diagram;
Fig. 2 is vertical double roller continuous casting schematic diagram;
Fig. 3 a is the metallographic structure photo (adding polarised light) of vertical double roller continuous casting 5052 aluminium alloy strips;
Fig. 3 b is the metallographic structure photo (not adding polarised light) of vertical double roller continuous casting 5052 aluminium alloy strips;
Fig. 4 is a process chart of the present invention.
Wherein: 1 is lip among the figure; 2 is aluminum alloy melt; 3 are the casting roller; 4 is condensing zone; 5 is the strip base; 6 is flow distribution device
The specific embodiment
The invention will be further described below in conjunction with specific embodiment, to help understanding content of the present invention.
The raw material of aluminium alloy is 5052, and its chemical composition is as shown in table 1.
Table 1
| The trade mark | Mg | Fe | Cr | Si | Zn | Mn | Cu | Al |
| 5052 | 2.363 | 0.372 | 0.191 | 0.115 | 0.100 | 0.055 | 0.017 | Surplus |
Production technology as shown in Figure 4, its process is as follows successively:
The preheating of aluminium alloy base: at first with the aluminium alloy base in 200 ℃ of preheatings 15 minutes;
Melting: add a small amount of smelting fusing agent in the resistance melting crucible furnace, when treating the glow of crucible inwall, will put into crucible through the aluminium alloy base of preheating, the usual method that the fusing back smelts with aluminium alloy is pulled out slag, leaves standstill 10 minutes after the fusing of aluminium alloy base;
Leave standstill: then melt is changed over to the tundish insulation and left standstill 15 minutes, temperature begins casting when being 650 ℃;
Continuous casting: aluminum alloy melt is carried out continuous casting by flow distribution device and isometrical vertical dual-roller thin-band conticaster.With reference to shown in Figure 2, adopt isometrical vertical dual-roller conticaster of thin sheet billet to carry out strip base continuous casting, two casting rollers 3 of conticaster are to be horizontally disposed on same horizontal plane, casting roller two ends have side seal system and casting roller 3 to constitute the molten bath of splendid attire aluminum alloy melt 2, aluminum alloy melt 2 is a condensing zone 4 with the contact area of casting roller 3 in the molten bath, and flow distribution device 6 delivery ports are lower than bath surface and form the submersible casting.Side seal system warm-up temperature is 400 ℃ before the casting, and the aluminum alloy melt that melt melts during casting enters isometrical vertical double-roller continuous casting machine by flow distribution device 6, casts with the mode of slipping into, and the maintenance melt pool height is 100mm, and its casting speed is 20m/min.Tape thickness is controlled by the coupling mechanism force of regulating the hydraulic system that is used to control roll gap in the isometrical vertical dual-roller conticaster of thin sheet billet, begin the casting roller and be set to 0 roll gap, in the casting process, melt can be full of the molten bath very soon, the casting roller of rotation is successfully sent the aluminium alloy strip, makes casting smooth.Enter pinch roll after strip base 5 leaves casting roller 3, obtaining thickness is 3.5mm, and width is that the surface quality of 150mm is good, the even tiny aluminum alloy thin belt blank of interior tissue.
The casting roller diameter of isometrical vertical dual roll casting machine is 300mm, and casting roller width is 150mm.
Aluminium alloy stock, method of smelting and casting roller size are identical with embodiment 1.
Change aluminium alloy melt over to tundish, after the ingot casting fusing, be incubated and left standstill 15 minutes, temperature begins casting when being 660 ℃, side seal system warm-up temperature is 400 ℃ before the casting, melt enters isometrical vertical double-roller continuous casting machine by flow distribution device during casting, cast with the mode of slipping into, the maintenance melt pool height is 100mm, and its casting speed is 40m/min.Enter pinch roll after the strip base leaves the casting roller, obtaining thickness is 2.5mm, and width is that the surface quality of 150mm is good, the even tiny aluminum alloy thin belt blank of interior tissue.
Aluminium alloy stock, method of smelting and casting roller size are identical with embodiment 1.
Change aluminium alloy melt over to tundish, after the ingot casting fusing, leave standstill and begin casting when temperature was 680 ℃ in 20 minutes, side seal system warm-up temperature is 430 ℃ before the casting, melt enters isometrical vertical double-roller continuous casting machine by the melt distributor during casting, cast with the mode of slipping into, the maintenance melt pool height is 100mm, and its casting speed is 50m/min.Enter pinch roll after the strip base leaves the casting roller, obtaining thickness is 2.0mm, and width is that the surface quality of 150mm is good, the even tiny aluminum alloy thin belt blank of interior tissue.
Aluminium alloy stock, method of smelting and casting roller size are identical with embodiment 1.
Change aluminium alloy melt over to tundish, after the ingot casting fusing, leave standstill and begin casting when temperature was 680 ℃ in 25 minutes, side seal system warm-up temperature is 450 ℃ before the casting, melt enters isometrical vertical double-roller continuous casting machine by the melt distributor during casting, cast with the mode of slipping into, the maintenance melt pool height is 100mm, and its casting speed is 60m/min.Enter pinch roll after the strip base leaves the casting roller, obtaining thickness is 2.0mm, and width is that the surface quality of 150mm is good, the even tiny aluminum alloy thin belt blank of interior tissue.
Aluminium alloy stock, method of smelting and casting roller size are identical with embodiment 1.
Change aluminium alloy melt over to tundish, after the ingot casting fusing, leave standstill and begin casting when temperature was 680 ℃ in 30 minutes, side seal system warm-up temperature is 430 ℃ before the casting, melt enters isometrical vertical double-roller continuous casting machine by the melt distributor during casting, cast with the mode of slipping into, the maintenance melt pool height is 120mm, and its casting speed is 100m/min.Enter pinch roll after the strip base leaves the casting roller, obtaining thickness is 1.0mm, and width is that the surface quality of 150mm is good, the even tiny aluminum alloy thin belt blank of interior tissue.
Adopt the inventive method, the aluminium alloy of fusion can be cast directly that can to obtain thickness be 1.0～3.5mm, width is 150mm, the aluminum alloy strip of neat in edge, and the crystal grain of made-up belt is tiny
Fig. 3 is the metallographic structure (adopting the sodium hydroxide solution etch) of vertical twin roller casting 5052 aluminium alloy strips.Technology of the present invention is crystal grain thinning and improve alloy organizing well, and in vertical double roller continuous casting Solidified Process of Aluminum Alloys, because the cooldown rate height, degree of supercooling increases, and the nucleation rate increase diminishes crystal grain.The degree of supercooling increase makes in the process of setting atom diffusion be suppressed, and crystal grain can not be grown up fully.Rapid solidification makes the obvious refinement of crystal grain by above two aspect effects, after measured, 650 ℃ of cast temperatures, casting speed is under the 20m/min condition, and 5052 aluminium alloy strip metallographic structure photos are shown in Fig. 3 a, crystal grain tiny (the crystal grain mean chord is about 7 μ m), simultaneously, the bigger degree of supercooling of rapid solidification also can increase the solid solubility of solute element in matrix, makes more alloying element solid solution in aluminum substrate, reduce the segregation of alloying element, improve alloy structure.Shown in Fig. 3 b, with Fig. 3 a same process condition under, second is mutually tiny and be evenly distributed in the 5052 aluminium alloy strips.So the aluminium alloy strip comprehensive mechanical property that the inventive method obtains is higher.
Claims (3)
1. the continuous casting process of an aluminum alloy thin belt blank, it is characterized in that: be to utilize isometrical vertical dual-roller conticaster of thin sheet billet to carry out strip base continuous casting, two casting rollers of described conticaster are to be horizontally disposed on same horizontal plane, and casting roller two ends have side seal system and casting roller to constitute the molten bath.
2. the continuous casting process of aluminum alloy thin belt blank according to claim 1 is characterized in that may further comprise the steps:
(1), under flux protection, puts into melting furnace and carry out melting with after the preheating of aluminium alloy base;
(2) side seal system warm-up to 400～450 ℃ before the casting;
(3) melt temperature under flux protection, changes the tundish insulation over to and left standstill 15～30 minutes in the time of 650～680 ℃, enter isometrical vertical double-roller continuous casting machine by flow distribution device then, it is 0mm that the casting roller is reserved roll gap, and the maintenance melt pool height is 90～340mm, and the mode of slipping into is cast;
(4) casting speed of casting machine is 20～120m/min during casting;
(5) after the strip base leaves the casting roller, enter pinch roll, the aluminum alloy thin tape thickness that casts out is 1.0～3.5mm.
3. the continuous casting process of aluminum alloy thin belt blank according to claim 1 is characterized in that: tape thickness is controlled by the coupling mechanism force of regulating the hydraulic system that is used to control roll gap in the isometrical vertical dual-roller conticaster of thin sheet billet.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102357628A (en) * | 2011-10-13 | 2012-02-22 | 北京机电研究所 | Method for forming aluminum alloy branch forgings |
| CN103801677A (en) * | 2013-10-21 | 2014-05-21 | 芜湖长启炉业有限公司 | Superconductive type automatic cooling bed for foamed aluminum |
| CN108220670A (en) * | 2018-01-11 | 2018-06-29 | 中北大学 | A kind of Cu-Ni-Si-Mg alloy sheet strips casting-rolling method and casting and rolling installation |
| CN109822067A (en) * | 2019-04-08 | 2019-05-31 | 东北大学 | A kind of method that Ni-based non-crystalline thin-band is continuously prepared |
| CN111761036A (en) * | 2020-07-08 | 2020-10-13 | 甘肃东兴铝业有限公司 | Casting and rolling method for 6xxx series aluminum alloy plate for automobile |
| CN111933957A (en) * | 2020-07-14 | 2020-11-13 | 中北大学 | Preparation method and application of transition metal oxide with controllable aluminum doping amount |
| CN112355259A (en) * | 2020-11-09 | 2021-02-12 | 中铝材料应用研究院有限公司 | Preparation device and preparation method for liquid continuous solidification forming of aluminum alloy sheet |
| CN114107744A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Thin-strip continuous casting high-performance 6XXX aluminum alloy plate strip and preparation method thereof |
| CN114107767A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Thin strip continuous casting high-performance 7XXX aluminum alloy thin strip and preparation method thereof |
| CN114269492A (en) * | 2019-07-03 | 2022-04-01 | 斯佩拉有限公司 | Melt supply for a strip casting installation |
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| CN1748907A (en) * | 2005-10-21 | 2006-03-22 | 重庆大学 | Process for continuously casting magnesium alloy thin strip blank |
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- 2008-05-26 CN CN2008100980945A patent/CN101269406B/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357628A (en) * | 2011-10-13 | 2012-02-22 | 北京机电研究所 | Method for forming aluminum alloy branch forgings |
| CN103801677A (en) * | 2013-10-21 | 2014-05-21 | 芜湖长启炉业有限公司 | Superconductive type automatic cooling bed for foamed aluminum |
| CN108220670A (en) * | 2018-01-11 | 2018-06-29 | 中北大学 | A kind of Cu-Ni-Si-Mg alloy sheet strips casting-rolling method and casting and rolling installation |
| CN109822067A (en) * | 2019-04-08 | 2019-05-31 | 东北大学 | A kind of method that Ni-based non-crystalline thin-band is continuously prepared |
| CN114269492A (en) * | 2019-07-03 | 2022-04-01 | 斯佩拉有限公司 | Melt supply for a strip casting installation |
| CN114269492B (en) * | 2019-07-03 | 2023-05-09 | 斯佩拉有限公司 | Melt supply for a strip casting plant |
| US11673184B2 (en) | 2019-07-03 | 2023-06-13 | Speira Gmbh | Melt feeding for strip casting systems |
| CN111761036A (en) * | 2020-07-08 | 2020-10-13 | 甘肃东兴铝业有限公司 | Casting and rolling method for 6xxx series aluminum alloy plate for automobile |
| CN111933957A (en) * | 2020-07-14 | 2020-11-13 | 中北大学 | Preparation method and application of transition metal oxide with controllable aluminum doping amount |
| CN114107744A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Thin-strip continuous casting high-performance 6XXX aluminum alloy plate strip and preparation method thereof |
| CN114107767A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Thin strip continuous casting high-performance 7XXX aluminum alloy thin strip and preparation method thereof |
| CN112355259A (en) * | 2020-11-09 | 2021-02-12 | 中铝材料应用研究院有限公司 | Preparation device and preparation method for liquid continuous solidification forming of aluminum alloy sheet |
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