CN1077472C - Remelting and compression casting technology for sillicon-aluminium-copper alloy - Google Patents
Remelting and compression casting technology for sillicon-aluminium-copper alloy Download PDFInfo
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- CN1077472C CN1077472C CN98121606A CN98121606A CN1077472C CN 1077472 C CN1077472 C CN 1077472C CN 98121606 A CN98121606 A CN 98121606A CN 98121606 A CN98121606 A CN 98121606A CN 1077472 C CN1077472 C CN 1077472C
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Abstract
The present invention discloses remelting and compression casting technology for Al-Si-Cu alloy. On the basis of the existing national Al-Si-Cu alloy technology, the technology breaks through the recognition of the alloy by the existing national technology, uses high smelting (remelting) temperature of 760 to 820 DEG C and high casting temperature of 710 to 760 DEG C, and fully uses action to the mechanical properties of the alloy by technological conditions to make the mechanical properties of the alloy reach or exceed advanced international levels and realize the nationalization of the alloy with high intensity.
Description
The invention belongs to the melting of aluminium alloy, the die casting production method is specifically related to the remelting and the extrusion process of Al-Si-Cu alloy.
Because Al-Si-Cu (aluminium copper silicon) class alloy has favorable mechanical and processing performance, industrially developed country such as the U.S., Japan, Germany, Britain, France are widely used in this type of alloy the casting forming of structural members such as radio communication, instrument and meter, tank, automobile, motorcycle and household electrical appliance and form respective standard.The U.S. has formulated the ASTM standard advanced in the world that occupies for its mechanical performance index.Other countries such as Britain also bring up to 320Mpa with LM24-M tensile strength of alloys value by 180Mpa, and Japan brings up to 323Mpa with ADC10 tensile strength of alloys value by 300Mpa.The applicant does not find as yet that by retrieval the processing parameter of above alloy standard is recorded on the public publication.
Al-Si-Cu class alloy ZL107 (GB1173-74) is also arranged in the domestic pack alloy series; But because expose hot tearing in the application process, hot-short tendency is serious, and do not apply well.At present, the standard YZAl-Si9-Cu4 of the Al-Si-Cu class alloy of China's development and formulation, this standard alloy chemical analysis is basically within the chemical analysis scope of the U.S.'s 380 pack alloys (ASTMB85-82) standard, but because its verification technique does not break through the traditional handicraft of Al-Si alloy significantly, its mechanical performance index is lower than U.S. ASTM standard.See Table one:
China compares with international most advanced level with application level the checking of Al-Si-Cu alloy and has gap for a long time, mainly be the understanding that lacks the Al-Si-Cu alloy characteristic, dare not break through due to the traditional handicraft that the Al-Si that forms in decades closes box melting (remelting) and die casting.
Present domestic Al-Si-Cu alloy and Al-Si alloy melting and extrusion process are: one, alloy melting (remelting) a technology is prepared, and the b furnace charge is gone into stove, and c heats up, the d melting, and e leaves standstill, is incubated, the sampling of f chemical analysis, g comes out of the stove.Two, die casting a technology is prepared, the b mold cleaning, and c coating, the d matched moulds, the e cast, the f injection, g holds pressure, the h die sinking, j takes out foundry goods.The verification condition such as the table two of its process conditions and Al-Si-Cu alloy: table one: technology (chemical analysis, the main Mechanical) index of Al-Si-Cu similar alloy in the present various countries respective standard
Table two: the checking technology of Al-Si alloy and traditional handicraft Al-Si-Cu alloy
| Alloy | Main chemical (%) | Impurity (≯ %) | |||||||||||||
| ?Si | ?Cu | ?Mg | ?Mn | ?Al | ?Fe | ?Zn | ?Sn | ?Ni | ?Pb | ?Ti | Other | Sum total | ?Bb(Mpa) | δ(％) | |
| The U.S. 380 (ASTMB85-82) | ?7.5-9.5 | ?3.0-4.0 | ?0.1 | ?0.5 | All the other | ?2.0 | ?3.0 | ?0.35 | ?0.5 | ?0.1 | ?0.5 | ?320 | ?2.5 | ||
| Japan ADC10 (JISH5302-76) | ?2.0-4.0 | ?0.3 | ?1.3 | ?1.0 | ?0.3 | ?2.0 | ?323 | ?4.0 | |||||||
| Germany GD-Al-Si8-Cu3 (DIN1752-76) | ?2.0-3.5 | ?0.2-0.5 | ?1.2 | ?0.1 | ?0.3 | ?0.2 | ?0.15 | ?0.15 | ?240-310 | ?0.5-0.3 | |||||
| Britain LM24-M (BS1490-76) | ?3.0-4.0 | ?0.5 | ?3.0 | ?0.2 | ?0.5 | ?0.3 | ?0.2 | ?320 | ?2.0 | ||||||
| China YZAl-Si9-Cu4 (JB3069-82) | ?0.1-0.3 | ?0.2-0.5 | ?1.0 | ?1.2 | ?0.1 | ?2.0 | ?240 | ?1.0 | |||||||
| Technology | Melting (heavily refining) temperature (℃) | Pouring temperature (℃) | Filling speed (injection speed) | Injection ratio pressure (N/cm 2) |
| Ai-Si alloy traditional handicraft | ≤750 | 630-710 | (0.3-5m/sec injection speed) | 2000-6000 |
| The domestic checking technology of Al-Si-Cu alloy | 720-≯760 | 620-660 | 1-2m/sec (injection speed) | 6248-6860 |
The mechanical performance of homemade Al-Si-Cu alloy is compared with international most advanced level had gap.
The applicant does not find the domestic new technology that has by retrieval yet, makes the mechanical performance of homemade Al-Si-Cu alloy meet or exceed international most advanced level.
The object of the present invention is to provide the existing Al-Si-Cu alloy checking of a kind of breakthrough, manufacturing condition, make the mechanical performance of alloy meet or exceed international most advanced level.
For realizing the purpose of invention, the present invention is the basis of the checking technology (table two) of the traditional handicraft of Al-Si alloy melting (remelting) die casting and Al-Si-Cu alloy at home, the inventor is by exploring and research and propose following technological parameter repeatedly: the smelting temperature of melting (remelting) operation is 760-820 ℃, the pouring temperature of cast operation is 710-760 ℃, specific pressure 7000-12000N/cm in the injection operation in the extrusion process
2
The smelting temperature that this process using is higher has improved the spread of high-melting-point intensified element in the alloy, and nucleus is more evenly distributed, and avoids the generation of sludge phenomenon to greatest extent, reduces the influence of this operation to alloy mechanical performance.
Usually the purpose that " refining " handled in the melting cast aluminum alloy (remelting) is degasification, slagging-off.Alloy contaminated degree in press casting procedure is very big, thereby bring very big influence for the quality of die casting, by carrying out quiet insulation again after " refining " processing, " refining " and holding temperature all are lower than 760 ℃ in the existing technology, can not satisfy the requirement of the high-melting-point intensified element spread, produce the sludge phenomenon, and directly have influence on the mechanical performance of foundry goods.So the present invention adopts higher smelting temperature.
Adopting 710-760 ℃ of higher pouring temperatures, is for improving the filling capacity of alloy liquation.Under hot conditions, alloy grain has the trend of increase, but by Quench, can make grain refinement.Adopt high injection ratio pressure then to make alloy filling process winding volume of air be compressed to minimum, with the density of raising tissue, thus the mechanical performance of raising alloy.
In press casting procedure, should adopt the higher fill rate that is.
Other technological parameter of the present invention:
The ratio of the foundry returns of Li Yonging again: the virgin material of Al-Si-Cu alloy and repeatedly foundry returns die casting sampling under equal process conditions, the tensile strength of sample and percentage elongation no significant difference.For guaranteeing the quality of alloy liquid, when removing strict control foundry returns quality state and " refining " processing, the foundry returns proportion is still indispensable sport technique segment in the control furnace charge.The foundry returns proportion is no more than 60% in the furnace charge.
After temperature retention time " refining " disposed, temperature retention time had the trend of raising to the mechanical performance of Al-Si-Cu alloy, but takes into account consideration from economy and applicability, and temperature retention time is at least 30 timesharing.
The mold temperature mold temperature directly has influence on the occupied state and the molten metal crystallization rate under high pressure of molten metal.The two is directly connected to the quality of product (sample or foundry goods) casting forming, and mold temperature of the present invention is controlled at 200-250 ℃.
Other operation comprises as the preceding technology standard of alloy melting (remelting) puts forth energy, and furnace charge is gone into stove time and order, and alloy melting (remelting) and die casting safety operation, standard or the like are all undertaken by the routine of Al-Si alloy melting (remelting) and die casting.
Accompanying drawing Al-Si-Cu alloy melting of the present invention (remelting) casting forming technological process " frame " figure.
Embodiment
In order to verify that the present invention compares with domestic prior art and has outstanding substantive distinguishing features and marked improvement, promptly the foundry goods mechanical performance with this explained hereafter obviously is better than JB3069-82 standard, and meets or exceeds international standard.Because the using value of casting alloy and the quality level that foundry goods can reach thereof, the mechanical performance of the general in the world sample with its casting is assessed.Therefore the inventor has done the checking of four groups of contrast tensile samples, and die casting machine all adopts homemade J1113 (A) type die casting machine.Alloy different technical parameters melting (remelting), die casting sampling checking the results are shown in Table three: table three: the molten refining of Al-Si-Cu class alloy different technical parameters (remelting), die casting sampling checking result
| Verification number | (1) | (2) | (3) | (4) | ||||
| The checking alloy | 380 (U.S.) | Al-Si9-Cu4 (homemade B) | YZAl-Si9-Cu4 (homemade J) | YZAl-Si8-Cu3 (homemade X) | ||||
| Checking equipment | J1113 (A) (homemade die casting machine) | |||||||
| Size of sample and water heat-extraction system | U.S. ASTM standard (this standard only provides size of sample and watered heat-extraction system and arrange, concrete parameter is not provided) | |||||||
| Technological parameter | Melting (remelting) temperature (℃) | 800±10 | ≯760 | 720-750 | ||||
| Pouring temperature (℃) | 750±10 | 620-660 | 640±10 | |||||
| Fill rate (injection speed) | Hurry up (the fast shelves of J1113) | 1-2m/sec (pressing speed) | 1m/sec (pressing speed) | |||||
| Injection ratio pressure (N/cm 2) | 11068 | 6860 | 6243 | |||||
| Ingate sectional area (mm 2) | 63.5 | 31.8 | 32.4 | |||||
| The checking class value | Can reach (X) | σb(Mpa) | 326 | 330 | 250 | |||
| δ(％) | 3.3 | 3.2 | 3.5 | |||||
| The highest (X) | σb(Mpa) | 350.5 | (34.2 single-piece) | 270 | 280 | |||
| δ(％) | 3.4 | (4.0 single-piece) | 3.7 | 2.0 | ||||
| The technological parameter contrast | Sample melting of the present invention, casting forming major parameter | The melting of prior art sample, casting forming major parameter | ||||||
| Effect | Meet international standards | Do not meet international standards | ||||||
The alloy composition of verification number in the table three (1), (2), (3), (4) sees Table one.Wherein (i) is same batch of " 380 " alloy from U.S.'s import, (2), (3), (4) are homemade Al-Si-Cu alloy, (2) are the Benxi Alloy Plant material, (3) are the mechanical industry ministerial standard, (4) be emerging opto-mechanical factory of Ministry of ordnance Industry emblem mark, but adopted different technological parameter production.Wherein technological parameter production of the present invention is adopted in (1), (2), and the temperature retention time of melting (heavy molten) technology is 30 minutes, and mold temperature is at 200-250 ℃.Both mechanical performances have all surpassed China JB3069-82 standard, arrive or surpassed the tensile strength values of U.S. ASTMB885-82 standard-required.(3), (4) then be existing domestic checking technology to the Al-Si-Cu alloy, its mechanical performance can only reach JB3069-82 standard, far below international standard.
Therefore, no matter be the Al-Si-Cu standard alloy of import, still homemade similar, with the alloy of the trade mark, after breaking through domestic prior art, the present invention's the molten refining of Al-Si-Cu alloy (remelting), the technological parameter of casting forming have been adopted, (technological parameter of (1), (2) is the melting (remelting) of Al-Si-Cu alloy sample, the technological parameter of casting forming in the table three) could excavate the intrinsic mechanical performance of this alloy more fully.The casting forming processing parameter of Al-Si-Cu alloy in process of production, smelting temperature is 790-810 ℃, leaves standstill holding temperature and is not less than 760 ℃.Pouring temperature is at 720-7400 ℃, and injection ratio pressure is 7000-8000N/cm
2
Based on technical characterictic of the present invention, in actual production process, can formulate extrusion processes according to different bars such as the size of foundry goods, shape, structure, wall thickness, in the hope of good economic benefit and social benefit.
This technology is applicable to the disclosed Al-Si-Cu alloy of table one composition.
Claims (5)
1, a kind of remelting of Al-Si-Cu alloy and extrusion process, each operation that comprises Al-Si-Cu alloy remelting and die casting, it is characterized in that smelting temperature is 760～820 ℃ in the remelting operation, the pouring temperature of cast operation is 710-760 ℃, specific pressure 7000-12000N/cm in the injection operation in the extrusion process
2
2, the remelting of Al-Si-Cu alloy and extrusion process according to claim 1 is characterized in that the temperature retention time at least 30 minutes after melting finishes, and holding temperature is 760-820 ℃.
3, the remelting of Al-Si-Cu alloy and extrusion process according to claim 1 is characterized in that the foundry returns proportion is no more than 60%.
4, the remelting of Al-Si-Cu alloy and extrusion process according to claim 1 is characterized in that smelting temperature is selected and are 790-810 ℃, 720-740 ℃ of casting pouring temperature, injection ratio pressure 7000-8000N/cm
2
5, the remelting of Al-Si-Cu alloy and extrusion process according to claim 1 is characterized in that the smelting temperature that sample is shaped is 790-810C, and pouring temperature is 740-760 ℃, and injection ratio pressure is 11068N/cm
2
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| Application Number | Priority Date | Filing Date | Title |
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| CN98121606A CN1077472C (en) | 1998-09-18 | 1998-09-18 | Remelting and compression casting technology for sillicon-aluminium-copper alloy |
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| CN98121606A CN1077472C (en) | 1998-09-18 | 1998-09-18 | Remelting and compression casting technology for sillicon-aluminium-copper alloy |
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| CN1077472C true CN1077472C (en) | 2002-01-09 |
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| CN101628328B (en) * | 2009-08-05 | 2011-07-20 | 昆明贵金属研究所 | New preparation method of AgMgNi alloy conducting ring |
| CN101660073B (en) * | 2009-09-21 | 2011-01-05 | 福州钜立机动车配件有限公司 | Recasting aluminum alloy material of connecting rod |
| CN102434438A (en) * | 2011-11-10 | 2012-05-02 | 广州万宝集团压缩机有限公司 | Aluminum alloy cylinder seat, manufacture method for aluminum alloy cylinder seat of refrigeration compressor and refrigeration compressor |
| CN102688998B (en) * | 2012-05-30 | 2013-07-31 | 太仓海嘉车辆配件有限公司 | Method for producing double-clutch valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1174771A (en) * | 1996-08-26 | 1998-03-04 | 宋修民 | Melted aluminium casting technology and equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1174771A (en) * | 1996-08-26 | 1998-03-04 | 宋修民 | Melted aluminium casting technology and equipment |
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