CN101745610A - Method for casting high-strength aluminum alloy round ingot by continuous oil gas lubrication - Google Patents
Method for casting high-strength aluminum alloy round ingot by continuous oil gas lubrication Download PDFInfo
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- CN101745610A CN101745610A CN200810244173A CN200810244173A CN101745610A CN 101745610 A CN101745610 A CN 101745610A CN 200810244173 A CN200810244173 A CN 200810244173A CN 200810244173 A CN200810244173 A CN 200810244173A CN 101745610 A CN101745610 A CN 101745610A
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- 238000005266 casting Methods 0.000 title claims abstract description 96
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 27
- 238000005461 lubrication Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000498 cooling water Substances 0.000 claims abstract description 22
- 238000009413 insulation Methods 0.000 claims abstract description 19
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 11
- 239000000956 alloy Substances 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000009749 continuous casting Methods 0.000 claims abstract description 11
- 238000002844 melting Methods 0.000 claims abstract description 10
- 230000008018 melting Effects 0.000 claims abstract description 10
- 238000007670 refining Methods 0.000 claims abstract description 9
- 239000002893 slag Substances 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 239000000155 melt Substances 0.000 claims abstract description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 7
- 239000011777 magnesium Substances 0.000 claims abstract description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000006698 induction Effects 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 19
- 239000000314 lubricant Substances 0.000 claims description 16
- 239000004411 aluminium Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000010687 lubricating oil Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000005275 alloying Methods 0.000 claims description 5
- 230000006641 stabilisation Effects 0.000 claims description 5
- 238000011105 stabilization Methods 0.000 claims description 5
- 229910052725 zinc Inorganic materials 0.000 claims description 5
- 239000011701 zinc Substances 0.000 claims description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract 1
- 235000010210 aluminium Nutrition 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 229910017985 Cu—Zr Inorganic materials 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003887 surface segregation Methods 0.000 description 1
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Abstract
The invention relates to a method for casting a high-strength aluminum alloy round ingot by continuous oil gas lubrication, which comprises the following steps: firstly, melting an industrial pure aluminum ingot in an induction furnace; after the industrial pure aluminum ingot is molten, controlling the melt temperature at 700-730 DEG C, and adding an industrial pure zinc ingot and an industrial pure magnesium ingot; stirring the melt, heating up to 710-750 DEG C, and adding Al-50Cu, Al-10Zr, Al-10Mn and Al-5Cr intermediate alloy ingots; stirring and transferring the melt to a heat-insulation holding furnace for refining and removing slag; before casting, adding Al-5Ti-B poles into the furnace for thinning the melt; in the semi-continuous casting process, adopting a continuous oil gas lubrication crystallizer; in the casting process, controlling the crystallizer compressed air pressure at 0.1-0.4MPa and the lubrication oil pressure at 0.2-0.8MPa, mixing the compressed air and the lubrication oil, and forming an oil-gas cushion film on the inner wall of the crystallizer; in the initial stage of casting, controlling the casting speed at 10-30mm/min and the cooling water pressure at 0.08-0.1MPa; and after casting for a certain length, gradually increasing the casting speed and the cooling water pressure, and keeping the casting speed and the cooling water pressure constant. The method not only can be used for successfully casting a high-strength aluminum alloy cast ingot, but also can obviously improve surface quality of the cast ingot.
Description
Technical field
The present invention relates to a kind of method for casting high-strength aluminum alloy round ingot by continuous oil gas lubrication, belong to the aluminum alloy semi-continuous casting technical field.
Background technology
High strength alumin ium alloy is that Al-Zn-Mg-Cu-Zr is an alloy, and combination property is more excellent, has higher structural strength, fracture toughness and stress corrosion resistant, is a kind of lightweight structural material that extensively adopt in current Aeronautics and Astronautics field.Yet the alloying element content of high strength alumin ium alloy is often higher, and for representative alloy 7050 wherein, the content of elements such as its Zn, Mg, Cu is especially up to 12%.In process of setting, the low melting point eutectic phase number at crystal boundary place increases, thus the ability drop of ingot casting opposing crackle.It is reported that hot tearing and the cold cracking phenomenon in casting later stage of high strength alumin ium alloy ingot casting in casting process is very serious, casting success ratio is lower, and the tearing tendency of ingot casting increases along with the increase of ingot casting specification.
In order to improve the lumber recovery of high strength alumin ium alloy ingot casting, often adopt the mode of fine aluminium shop fixtures, promptly at first cast one section commercial-purity aluminium ingot casting, and then the mode of carrying out normal alloy liquid casting prepares the high-strength alloy ingot casting at the casting initial stage.Adopt this technology to reduce the intensity of cooling of ingot casting bottom, reduced the bottom and solidified inner-stress value, can obtain the purpose of ingot casting bottom cracking to a certain extent.But, adopt fine aluminium shop fixtures technology to bring certain difficulty to casting operation, if the casting technique misoperation, melt liquid fluid capacitance easily will be spread bottom aluminium liquid and splash and sneak into melt, the cutting output of increase ingot casting head.
In addition, high strength alumin ium alloy ingot casting often surface quality is relatively poor, and the phenomenon of the gross segregation of element and ingot casting surface " segregation knurl " is very serious, must be before the follow-up distortion of ingot casting with the surface segregation layer mill off, and the financial cost of ingot casting preparation is higher.
Summary of the invention
The present invention is directed to the problem that the high strength alumin ium alloy ingot casting is easy to crack and surface quality is relatively poor, a kind of method for casting high-strength aluminum alloy round ingot by continuous oil gas lubrication is provided, adopting said method not only can successfully be cast the high strength alumin ium alloy ingot casting, and can significantly improve ingot surface quality.
Purpose of the present invention is achieved through the following technical solutions:
Method for casting high-strength aluminum alloy round ingot by continuous oil gas lubrication specifically may further comprise the steps---
1) alloying and melting: the technical pure aluminium ingot is placed on melting in the induction furnace, be controlled at melt temperature in 700 ℃～730 ℃ scopes after waiting to melt and add industrial-purity zinc, technical pure magnesium ingot, stir melt and its temperature is increased to 710 ℃～750 ℃, in melt, add Al-50Cu, Al-10Zr, Al-10Mn, Al-5Cr intermediate alloy ingot respectively, after the stirring melt is gone to the resistance heated insulation and leave standstill stove, heat up and leave standstill;
2) melt treatment: melt temperature is remained on 720～750 ℃, adopt no sodium refining agent and slagging agent that melt is carried out refining and slag hitting and handle, left standstill 10～20 minutes after pulling down the oxidizing slag of bath surface; In stove is left standstill in insulation, add Al-5Ti-B line pole pair melt and carry out thinning processing, and left standstill 20～50 minutes, casting is also prepared in the melt temperature insulation in 690 ℃～730 ℃ scopes;
3) semi-continuous casting: the oil-air lubrication crystallizer is adopted in semi-continuous casting, the oil-air lubrication crystallizer comprises insulation hot tap, crystallizer body, cooling water cavity, air chamber, lubricant reservoir, inside at the crystallizer body is provided with cooling water cavity, have air chamber and lubricant reservoir in the upper end of crystallizer body, the insulation hot tap is installed in the top of crystallizer body; At first open air chamber and lubricant reservoir before the casting beginning, and guarantee that air pressure range is 0.1～0.4MPa, the oil pressure scope is 0.2～0.8MPa, compressed air in the air chamber and the lubricating oil in the lubricant reservoir mix and encircle formation skim oil-air-cushion film in crystallizers, and liquid metal does not directly contact with the crystallizer inwall with ingot casting when making casting; Metal bath slowly flows into crystallizer during the casting beginning, and the dummy ingot base begins to descend with the speed of 10～30mm/min when crystallizer inner metal liquid position highly reaches 40～60mm, and the cooling water pressure in the cooling water cavity remains on 0.08～0.1MPa; Casting speed was increased to 40～80mm/min gradually after ingot casting length reached 100～200mm, and casting enters the stabilization sub stage; When stable casting, keep the constant of oil pressure and air pressure and casting technological parameter.
Further, compressed air in the above-mentioned method for casting high-strength aluminum alloy round ingot by continuous oil gas lubrication, step 3) air chamber and the lubricating oil in the lubricant reservoir mix with 1: 2～1: 4 ratio.
Further, above-mentioned method for casting high-strength aluminum alloy round ingot by continuous oil gas lubrication, the step 3) casting enters the stabilization sub stage, and for φ 300mm ingot casting, the scope of casting speed is 40～100mm/min, and the scope of cooling water pressure normal value is 0.1～0.3MPa.
Substantive distinguishing features and obvious improvement that technical solution of the present invention is outstanding are mainly reflected in:
The present invention applies continuous oil gas lubrication to the high strength alumin ium alloy ingot casting in casting process, in the surface quality that guarantees to have significantly improved when ingot casting is shaped smoothly ingot casting.Adopt this method not only can successfully cast the high strength alumin ium alloy ingot casting, and the ingot casting flawless, and surface quality is more excellent.
Description of drawings
Below in conjunction with accompanying drawing technical solution of the present invention is described further:
Fig. 1: the oil-air lubrication structure of mould schematic diagram that the present invention adopts.
The implication of each Reference numeral sees the following form among the figure:
| Reference numeral | Implication | Reference numeral | Implication | Reference numeral | Implication |
| ??1 | The insulation hot tap | ??2 | The crystallizer body | ??3 | Cooling water cavity |
| ??4 | Air chamber | ??5 | Lubricant reservoir | ??6 | Oil-air-cushion film |
The specific embodiment
The high-strength aluminum alloy round ingot by continuous oil gas lubrication foundry technology process is: at first alloying and melting: the technical pure aluminium ingot is placed on melting in the induction furnace, be controlled at melt temperature in 700～730 ℃ of scopes after waiting to melt and add industrial-purity zinc, technical pure magnesium ingot, stir melt and its temperature is increased to 710～750 ℃, in melt, add Al-50Cu, Al-10Zr, Al-10Mn, Al-5Cr intermediate alloy ingot respectively, after the stirring melt is gone to the resistance heated insulation and leave standstill stove, heat up and leave standstill; Melt treatment again: melt temperature is remained on 720～750 ℃, adopt no sodium refining agent and slagging agent that melt is carried out refining and slag hitting is handled, left standstill 10～20 minutes after pulling down the oxidizing slag of bath surface; In stove is left standstill in insulation, add Al-5Ti-B line pole pair melt and carry out thinning processing, and left standstill 20～50 minutes, casting is also prepared in the melt temperature insulation in 690 ℃～730 ℃ scopes; Last semi-continuous casting: the oil-air lubrication crystallizer is adopted in semi-continuous casting, as shown in Figure 1, the oil-air lubrication crystallizer comprises insulation hot tap 1, crystallizer body 2, cooling water cavity 3, air chamber 4, lubricant reservoir 5, in the inside of crystallizer body 2 cooling water cavity 3 is set, have air chamber 4 and lubricant reservoir 5 in the upper end of crystallizer body 2, insulation hot tap 1 is installed in the top of crystallizer body 2; At first open air chamber 4 and lubricant reservoir 5 before the casting beginning, and guarantee that air pressure range is 0.1～0.4MPa, the oil pressure scope is 0.2～0.8MPa, and the lubricating oil in compressed air in the air chamber 4 and the lubricant reservoir 5 mixes with 1: 2～1: 4 ratio; And in crystallizer, encircling formation skim oil-air-cushion film 6, liquid metal does not directly contact with the crystallizer inwall with ingot casting when making casting; Metal bath slowly flows into crystallizer during the casting beginning, and the dummy ingot base begins to descend with the speed of 10～30mm/min when crystallizer inner metal liquid position highly reaches 40～60mm, and the cooling water pressure in the cooling water cavity remains on 0.08～0.1MPa; Casting speed and cooling water pressure all raise gradually behind the casting 100mm, and casting enters the stabilization sub stage; For φ 300mm ingot casting, the scope of casting speed is 40～100mm/min, and the scope of cooling water pressure normal value is 0.1～0.3MPa; When stable casting, keep the constant of oil pressure and air pressure and casting technological parameter.
Said method is suitable for the high-strength aluminum alloy round ingot semi-continuous casting, with φ 350mm 7050 high strength alumin ium alloys casting example, embodiment of the present invention is described further:
1. alloying and melting: the technical pure aluminium ingot is put into the induction furnace melting, waiting to melt afterwards, melt temperature is controlled in 700～730 ℃ of scopes and adds industrial-purity zinc, technical pure magnesium ingot, in order to improve the recovery rate of magnesium metal, magnesium ingot adds and fashionablely is pressed into aluminum melt with bell jar, after waiting to melt bell jar is taken out.Melt is also stirred in heating, adds Al-50Cu, Al-10Zr, Al-10Mn, Al-5Cr intermediate alloy ingot when body temperature degree fusion is increased to 710～750 ℃ once more, leaves standstill behind the stirring melt.
2. melt treatment: insulation is left standstill and is adopted no sodium refining agent when melt temperature is increased to 720 ℃ in the stove and alloy melt is carried out refining to slagging agent and slag hitting is handled, and pulls down surperficial oxidizing slag, leaves standstill 10～15 minutes.
3. semi-continuous casting: began preceding 30 minutes in semi-continuous casting, in leaving standstill stove, insulation adds Al-5Ti-B line bar, open oil sources and source of the gas simultaneously, in Φ 350mm continuous lubricating crystallizer, feed lubricating oil and compressed air continuously, wherein air pressure is controlled at 0.2MPa, and lubrication pressure is controlled at 0.3MPa and remains constant.Begin casting when melt temperature is reduced to 690 ℃～700 ℃ in leaving standstill stove, 7050 alloy melts slowly flow into crystallizer and contact with oil-air-cushion film, cast that casting speed is controlled at 30mm/min when initial, and cooling water pressure is controlled at 0.1MPa.The long back of casting 200mm casting speed is increased to 50mm/min gradually, and cooling water pressure is increased to 0.17MPa gradually and keeps constant, finishes until casting process.The 7050 high strength alumin ium alloys circle ingot casting that adopts this mode to prepare, the ingot casting flawless, and surface quality is more excellent.
In sum, the present invention applies continuous oil gas lubrication to the high strength alumin ium alloy ingot casting in casting process, in the surface quality that guarantees to have significantly improved when ingot casting is shaped smoothly ingot casting.
Below only be concrete exemplary applications of the present invention, protection scope of the present invention is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, all drop within the rights protection scope of the present invention.
Claims (3)
1. method for casting high-strength aluminum alloy round ingot by continuous oil gas lubrication is characterized in that: may further comprise the steps---
1) alloying and melting: the technical pure aluminium ingot is placed on melting in the induction furnace, be controlled at melt temperature in 700～730 ℃ of scopes after waiting to melt and add industrial-purity zinc, technical pure magnesium ingot, stir melt and its temperature is increased to 710～750 ℃, in melt, add Al-50Cu, Al-10Zr, Al-10Mn, Al-5Cr intermediate alloy ingot respectively, after the stirring melt is gone to the resistance heated insulation and leave standstill stove, heat up and leave standstill;
2) melt treatment: melt temperature is remained on 720～750 ℃, adopt no sodium refining agent and slagging agent that melt is carried out refining and slag hitting and handle, left standstill 10～20 minutes after pulling down the oxidizing slag of bath surface; In stove is left standstill in insulation, add Al-5Ti-B line pole pair melt and carry out thinning processing, and left standstill 20～50 minutes, casting is also prepared in the melt temperature insulation in 690 ℃～730 ℃ scopes;
3) semi-continuous casting: the oil-air lubrication crystallizer is adopted in semi-continuous casting, the oil-air lubrication crystallizer comprises insulation hot tap, crystallizer body, cooling water cavity, air chamber, lubricant reservoir, inside at the crystallizer body is provided with cooling water cavity, have air chamber and lubricant reservoir in the upper end of crystallizer body, the insulation hot tap is installed in the top of crystallizer body; At first open air chamber and lubricant reservoir before the casting beginning, compressed air air pressure in the air chamber is at 0.1～0.4MPa, lubricating oil oil pressure in the lubricant reservoir is at 0.2～0.8MPa, and compressed air in the air chamber and the lubricating oil in the lubricant reservoir mix also that ring forms skim oil-air-cushion film in the crystallizer; Metal bath slowly flows into crystallizer during the casting beginning, and the dummy ingot base begins to descend with the speed of 10～30mm/min when crystallizer inner metal liquid position highly reaches 40～60mm, and the cooling water pressure in the cooling water cavity remains on 0.08～0.1MPa; Casting speed was increased to 40～80mm/min gradually after ingot casting length reached 100～200mm, and casting enters the stabilization sub stage; When stable casting, keep oil pressure and air pressure and casting technological parameter constant.
2. method for casting high-strength aluminum alloy round ingot by continuous oil gas lubrication according to claim 1 is characterized in that: compressed air in the step 3) air chamber and the lubricating oil in the lubricant reservoir mix with 1: 2～1: 4 ratio.
3. method for casting high-strength aluminum alloy round ingot by continuous oil gas lubrication according to claim 1 is characterized in that: the step 3) casting enters the stabilization sub stage, and for φ 300mm ingot casting, casting speed is at 40～100mm/min, and cooling water pressure is at 0.1～0.3MPa.
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| CN108213370B (en) * | 2018-01-02 | 2019-10-22 | 丛林集团有限公司 | A kind of aluminium alloy round cast ingot oil-air lubrication film casting method |
| CN109894586A (en) * | 2019-04-15 | 2019-06-18 | 中国科学院金属研究所 | A kind of preparation method of low surface segregation layer thickness aluminium alloy continuous casting ingot |
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| CN113426968B (en) * | 2021-05-20 | 2022-12-13 | 山东创新金属科技有限公司 | Aluminum alloy round cast ingot oil-gas lubricating film casting device and method |
| CN114012052A (en) * | 2021-12-30 | 2022-02-08 | 东北大学 | Horizontal continuous casting equipment for aluminum alloy cast ingot |
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| CN101745610B (en) | 2012-05-30 |
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Effective date of registration: 20171012 Address after: 471000 Henan Province, Luoyang city high tech Development Zone middle Ling Road Patentee after: China Nonferrous Metals Processing Technology Co., Ltd. Address before: Suzhou City, Jiangsu province 215021 Industrial Park No. 200 Shen Hu Road Patentee before: Suzhou Non-ferrous Metal academy Co., Ltd. |