CN105695779A - 一种高精度和高洁净度合金铝棒的制备方法 - Google Patents
一种高精度和高洁净度合金铝棒的制备方法 Download PDFInfo
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- CN105695779A CN105695779A CN201610278518.0A CN201610278518A CN105695779A CN 105695779 A CN105695779 A CN 105695779A CN 201610278518 A CN201610278518 A CN 201610278518A CN 105695779 A CN105695779 A CN 105695779A
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- alloy
- aluminum liquid
- alloying
- aluminium bar
- alloy aluminum
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- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 229910000838 Al alloy Inorganic materials 0.000 title abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 235
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound 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- FYYHWMGAXLPEAU-UHFFFAOYSA-N magnesium Chemical compound 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[Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 27
- 229910052749 magnesium Inorganic materials 0.000 claims description 27
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound 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O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 229910052710 silicon Inorganic materials 0.000 claims description 15
- 239000010703 silicon Substances 0.000 claims description 15
- 239000010949 copper Substances 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound 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[Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 10
- 238000003723 Smelting Methods 0.000 claims description 9
- 238000004458 analytical method Methods 0.000 claims description 9
- 241000220317 Rosa Species 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 239000006260 foam Substances 0.000 claims description 6
- 239000012467 final product Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000000875 corresponding Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000003749 cleanliness Effects 0.000 abstract description 5
- 238000003756 stirring Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 abstract description 3
- 239000004615 ingredient Substances 0.000 abstract 2
- 238000003754 machining Methods 0.000 abstract 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound 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[Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 14
- 239000012535 impurity Substances 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 239000000047 product Substances 0.000 description 9
- 238000005260 corrosion Methods 0.000 description 8
- 206010011376 Crepitations Diseases 0.000 description 4
- -1 aluminium-magnesium Chemical compound 0.000 description 4
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making alloys
- C22C1/02—Making alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making alloys
- C22C1/02—Making alloys by melting
- C22C1/03—Making alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making alloys
- C22C1/06—Making alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
Abstract
本发明公开了一种高精度和高洁净度合金铝棒的制备方法,首先在一定温度下完成合金化,并通过电磁搅拌作用使合金元素均匀分布,然后进行两次的除渣和除气操作;之后按一定速度向流槽的合金铝液中添加细化剂完成晶粒细化处理;再通过在线除气设备和特定孔隙陶瓷过滤板进行再次除渣和除气操作;最后浇注成尺寸合格的棒材。本发明在保障合金成分合格的基础上,又有效的提高了铝棒的洁净度和铸造质量。本发明工艺简单、自动化程度高、操作方便,所制备的合金铝棒不仅成分均匀,表面质量好,而且元素实收率高、含渣量和吸气量均十分少,产品质量可以满足高品质铝型材挤压加工处理的要求。因此,本发明具有很好工业应用价值。
Description
技术领域
[0001] 本发明设及一种高精度和高洁净度合金侣棒的制备方法,属于新材料技术领域中 材料及冶金技术领域。
背景技术
[0002] 侣及侣合金是常见的有色金属材料,由于其质量轻,性价比高,造型美,综合性能 好的特点,被广泛用于建筑、机械制造、航天、航空等工业领域,成为国民经济与社会发展的 重要基础性原材料。侣棒是侣合金中使用量非常大的一类中间产品,按含有的金属元素不 问,一般可W分为8个大类,包括1000系列侣棒、2000系列侣棒、3000系列侣棒、4000系列侣 棒、5000系列侣棒、6000系列侣棒、7000系列侣棒和8000系列侣棒,王要作为建筑型材、灌概 管材、汽车配件、栏栅等挤压产品的巧料或者飞机蒙皮、机身框架、螺旋奖等锻件产品的巧 料。一般来说,侣棒的制备主要包括烙化、配料、除气、除渣、细化、铸造等工艺流程,其中,配 料是关键,直接影响着合金元素含量是否合格;除气和除渣是核屯、,决定了合金棒材的铸造 质量;细化是灵魂,反映了合金的综合力学性能;铸造是保障,保证了型材的顺利挤压。在实 际生产过程中,通过化学成分分析可W很方便实现元素含量的调节,通过提高侣合金细化 剂质量可W很容易实现晶粒形貌和尺寸的改善,通过改进铸造设备也可W很简单实现铸棒 质量的控制,然而,在降低合金棒材中夹渣和氨气含量,提升合金的洁净度方面就比较困难 了。
[0003] 传统生产工艺中,由于除渣和除气技术的原因,使得侣棒中渣量高,吸气多,直接 导致侣棒在后期挤压加工中出现塑性和抗拉强度的下降,并使其加工制品因产生颗粒状毛 刺、裂纹、挤压暗纹等缺陷而成为废品。运也是目前侣型材废品率一直居高不下的一个重要 原因。
发明内容
[0004] 为了解决上述技术问题,本发明的目的是提供一种高精度和高洁净度合金侣棒的 制备方法。
[0005] 为了实现上述目的,本发明所采用的技术方案是:一种高精度和高洁净度合金侣 棒的制备方法,包括W下步骤:
[0006] (1)称取原料:按照合金侣棒成分要求,计算并称取所需重量的侣、儀和其它合金 元素,并将侣烙化成侣液;所述的其它合金元素为铜、娃中至少一种;
[0007] (2)第一次合金化:将其它合金元素加入烙炼炉中,并向烙炼炉中加入侣液,加热 至700-800°C,保溫20-30min,保溫的同时在侣液表面洒打渣剂,保溫结束后,化除侣液表面 的侣渣,得到合金侣液;
[000引(3)第一次炉内精炼:第一次合金化结束后,利用精炼机将精炼剂随氣气或氮气充 入步骤(2)的合金侣液中,对合金侣液进行第一次炉内精炼,精炼时间为10-30min;
[0009] (4)第一次取样分析:第一次炉内精炼结束后,化除步骤(3)合金侣液表面的浮渣, 对合金侣液中加入的其它合金元素进行取样分析,此时,如果加入的其它合金元素含量不 足,补充对应的其它合金元素至合金侣液中其它合金元素含量符合合金侣棒成分要求,同 时进行电磁揽拌;
[0010] (5)第二次合金化:调整步骤(4)的合金侣液溫度至720-760°C,加入儀,并静置10-SOmin;
[0011] (6)第二次炉内精炼:第二次合金化结束后,利用精炼机将精炼剂随氣气或氮气充 入步骤(5)的合金侣液中,对合金侣液进行第二次炉内精炼,精炼时间为10-30min;
[0012] (7)第二次取样分析:第二次炉内精炼结束后,化除步骤(6)合金侣液表面的浮渣, 对合金侣液中儀元素进行取样分析,此时,如果儀含量不足,补充儀至合金侣液中儀含量符 合合金侣棒成分要求,同时进行电磁揽拌;
[0013] (8)诱注系统预热:在合金侣液进行诱注之前,将诱注所用的流槽、分流盘和过滤 板进行预热;
[0014] (9)放流引铸:待步骤(7)合金侣液中的合金成分及溫度达到诱注要求后,开始放 流,步骤(7)的合金侣液依次经过流槽、在线除气设备、过滤板、分流盘和铸模,得到合金侣 棒;具体方法为:
[0015] (a)细化处理:待步骤(7)合金侣液中的合金成分及溫度达到诱注要求后,开始放 流,同时用喂丝机把M-Ti-B中间合金线导入流槽中对合金侣液进行在线细化处理;
[0016] (b)在线除气:步骤(a)细化处理后的合金侣液经过在线除气设备底部的流槽时, 将合金侣液暂时截流,并启动在线除气设备;当在线除气设备运行正常且流槽中的合金侣 液达到预定液位时继续放流;
[0017] (C)在线除渣:步骤(b)在线除气后的合金侣液穿过过滤板,对合金侣液进行除渣;
[0018] (d)铸棒:将步骤(C)除渣后的合金侣液通过分流盘引入铸模,连续灌注并辅W电 磁揽拌,冷却即得。
[0019] 所述的打渣剂用量为每12吨侣液加入1-化g打渣剂。
[0020] 步骤(3)和(6)两次加入精炼剂的总重量为每吨侣液加 0.5-3kg精炼剂,其中,第一 次炉内精炼时加入精炼剂的量为加入精炼剂总重量的60%,第二次炉内精炼时加入精炼剂 的量为加入精炼剂的总重量的40%。
[0021 ]优选的,步骤(3)和(6)两次加入精炼剂的总重量为每吨侣液加 0.5-化g精炼剂。
[0022] 步骤(8)中预热的溫度为700-800°C。
[0023] 步骤(9)中达到诱注要求的合金侣液溫度为750-850°C。
[0024] 步骤(a)细化处理中Al-Ti-B中间合金线的用量为合金侣液总重量的0.2%。
[0025] 步骤(a)细化处理中Al-Ti-B中间合金线的导入速度为2.4m/min。
[0026] 步骤(C)中过滤板放置在过滤箱内,过滤箱和铸模之间的距离为1.5m。
[0027] 步骤(C)中的过滤板为30/50PPi双层泡沫陶瓷过滤板。
[0028] 精炼过程中,氣气或者氮气与精炼剂在合金侣液内的上浮过程中可吸附大量合金 侣液中的氨气和夹渣。
[0029] 对合金元素进行取样分析时,可在烙炼炉炉口两侧向内30-50cm处各取样一处。
[0030] 对流槽、分流盘和过滤板进行预热,一方面可W避免水分与高溫合金侣液接触,发 生炸裂造成安全事故,另一方面可W防止水分与合金侣液反应增加含氨量。
[0031] 细化是解决气孔、晶粒粗大、光亮晶、羽毛晶、裂纹等铸造缺陷的有效措施,是影响 合金侣棒后续铸造质量的重要因素。
[0032] 在线除气设备一方面可W进一步降低合金侣液中氨气的含量,另一方面使合金侣 液中的氣气或氮气上浮,把炉内合金侣液中精炼不完全的部分夹渣吸附出液面,从而提高 合金侣液的纯净度。
[0033] 在过滤板的双层过滤作用下,合金侣液中不同粒径的夹渣等固体杂质将被过滤板 彻底吸附,进一步净化合金侣液。
[0034] 有益效果
[0035] 1、合金元素精度高。本发明严格控制合金化溫度,并采用合理的原料添加顺序,即 先加入娃、铜等不易烧损的原料,再加入儀等易烧损的原料,有效保障了合金侣液成分的精 度,原料烧损少。
[0036] 2、侣棒含渣量低。本发明先采用精炼机向合金侣液内部喷精炼剂进行除渣处理, 再通过陶瓷过滤板过滤进行除渣处理,有效清除了合金侣液内的夹渣,极大降低了侣棒中 的含渣量。
[0037] 3、侣棒吸气少。本发明先后采用了两次炉内精炼、一次流槽中在线除气操作,有效 降低了合金侣液中的气体含量,使铸棒中气孔率显著下降。
[0038] 4、杂质元素含量控制好。在侣棒的铸造过程中Fe元素是最大的一类杂质元素,一 般是因为使用铁质工具揽拌而引起合金侣液含化量的增加,但是本发明使用电磁揽拌代替 了传统的铁质工具揽拌,一方面避免了铁质工具的影响,有效降低了杂质化元素含量,另一 方面保证了揽拌的均匀性。
[0039] 5、实用性强。本发明的制备方法也适用于其他系列侣棒的生产和制备,如侣-铜合 金棒、侣-儀合金棒、侣儘合金棒、侣-娃-儀合金棒、侣-锋合金棒等。
[0040] 本发明首先在一定溫度下完成合金化,并通过电磁揽拌作用使合金元素均匀分 布,然后进行两次的除渣和除气操作(即第一次炉内精炼和第二次炉内精炼);之后按一定 速度向流槽的合金侣液中添加细化剂完成晶粒细化处理;再通过在线除气设备和特定孔隙 陶瓷过滤板进行再次除渣和除气操作;最后诱注成尺寸合格的棒材。本发明在保障合金成 分合格的基础上,又有效的提高了侣棒的洁净度和铸造质量,因此,本发明为工业界生产高 质量侣棒合金提供了一种极其重要的方法。
[0041] 本发明工艺简单、自动化程度高、操作方便,所制备的合金侣棒不仅成分均匀,表 面质量好,而且元素实收率高、含渣量和吸气量均十分少,产品质量可W满足高品质侣型材 挤压加工处理的要求。因此,本发明具有很好工业应用价值。
附图说明
[0042] 图1为实施例1中6061合金侣棒的宏观形貌。
[0043] 图2为实施例1中6061合金侣棒腐蚀前的金相图。
[0044] 图3为实例例1中6061合金侣棒腐蚀后的金相图。
[0045] 图4为实施例2中6063合金侣棒的宏观形貌。
[0046] 图5为实施例2中6063合金侣棒腐蚀前的金相图。
[0047] 图6为实施例2中6063合金侣棒腐蚀后的金相图。
具体实施方式
[0048] W下结合实施例对本发明的具体实施方式作进一步详细说明。
[0049] 实施例1
[0050] 本实施例为高精度和高洁净度6061合金侣棒的制备方法,包括W下步骤:
[0051] (1)称取原料:按照6061合金侣棒成分要求,计算并称取所需重量的侣、娃、儀和 铜,具体为,侣12t、娃86kg、儀11化g和铜30kg,并将侣烙化成侣液;
[0052] (2)第一次合金化:将娃、铜加入烙炼炉中,并向烙炼炉中加入侣液,加热至750°C, 保溫20min,保溫的同时在侣液表面洒1.化g打渣剂,保溫结束后,化除侣液表面的侣渣,得 到合金侣液;
[0053] (3)第一次炉内精炼:第一次合金化结束后,利用精炼机将精炼剂随氣气充入步骤 (2)的合金侣液中,对合金侣液进行第一次炉内精炼,精炼时间为15min,精炼剂用量为 12kg;
[0054] (4)第一次取样分析:第一次炉内精炼结束后,化除步骤(3)合金侣液表面的浮渣, 对合金侣液中娃、铜元素进行取样分析,此时,如果娃、铜含量不足,补充娃、铜至合金侣液 中娃、铜含量符合合金侣棒成分要求,同时进行电磁揽拌;
[0055] (5)第二次合金化:调整步骤(4)的合金侣液溫度至740°C,加入儀,并静置IOmin;
[0056] (6)第二次炉内精炼:第二次合金化结束后,利用精炼机将精炼剂随氣气充入步骤 (5)的合金侣液中,对合金侣液进行第二次炉内精炼,精炼时间为15min,精炼剂用量为8kg;
[0057] (7)第二次取样分析:第二次炉内精炼结束后,化除步骤(6)的合金侣液表面的浮 渣,对合金侣液中儀元素进行取样分析,此时,如果儀含量不足,补充儀至合金侣液中儀含 量符合合金侣棒成分要求,同时进行电磁揽拌;
[0058] (8)诱注系统预热:在合金侣液进行诱注之前,将诱注所用的流槽、分流盘和过滤 板进行预热,预热的溫度为780°C ;
[0059] (9)放流引铸:待步骤(7)合金侣液中的合金成分及溫度达到诱注要求后,开始放 流,诱注要求的合金侣液溫度为800°C,步骤(7)的合金侣液依次经过流槽、在线除气设备、 过滤板、分流盘和铸模,得到合金侣棒;具体方法为:
[0060] (a)细化处理:待步骤(7)合金侣液中的合金成分及溫度达到诱注要求后,开始放 流,合金侣液流入流槽,此时,同时用喂丝机把Al-STi-IB中间合金线W2.4m/min的速度导 入流槽中对合金侣液进行在线细化处理;A^STi-B中间合金线的用量为合金侣液总重量的 0.2% ;
[0061] (b)在线除气:用在线除气设备对步骤(a)细化处理后的合金侣液进行在线除气, 当合金侣液流经在线除气设备底部的流槽时,将合金侣液暂时截流,并启动在线除气设备; 当在线除气设备运行正常且流槽中的合金侣液达到预定液位时继续放流;
[0062] (C)在线除渣:将步骤(b)在线除气后的合金侣液穿过30/50PPi双层泡沫陶瓷过滤 板,对合金侣液进行除渣;30/50PPi双层泡沫陶瓷过滤板放置在过滤箱中,过滤箱和铸模之 间的距离为1.5m;
[0063] (d)铸棒:将步骤(C)除渣后的合金侣液通过分流盘引入铸模,铸锭机W170mm/min 的速度完成连续灌注并辅W电磁揽拌,冷却即得。
[0064]本实施例制备的6061合金侣棒的成分如表1所示。按照原料添加的实际重量,从理 论上计算应该得到Al-O . 24CU-0.92Mg-0.71Si合金,实际产品测试得到Al-O . 234CU-0.8721旨-0.70351合金,计算可得,加的实收率=0.234/0.24 = 97.5%;1旨的实收率二 0.872/0.92 = 94.8% ;Si的实收率= 0.703/0.71 = 99.0%,显示出很高的元素实收率。图1 是6061合金侣棒的宏观形貌图,从图1可见,合金侣棒表面光滑,无毛刺、起泡、裂纹等缺陷, 铸造质量优异。图2是6061合金侣棒腐蚀前的金相图,从图2可见,合金侣棒内部无气孔且氧 化物杂质含量非常少。据GB3246.1-2012变形侣及侣合金制品第1部分和第2部分中显微组 织检验方法及低倍组织检验方法统计,金相图1.5mm X 1. Omm范围内长度40-50WI1的杂质数 量少于2颗,50-70WI1的杂质数量少于1颗,低于行业标准,体现出很高的洁净度。图3是6061 合金侣棒腐蚀后的金相图,从图3可见,a-Al晶粒尺寸细小,分四个方向采用截线法统计测 量,平均粒径仅为71.59皿。
[00化]表1 6061合金侣棒化学成分(wt. % ) r00661
[0067] 实施例2
[0068] 本实施例为高精度和高洁净度6063合金侣棒的制备方法,包括W下步骤:
[0069] (1)称取原料:按照6063合金侣棒成分要求,计算并称取所需重量的侣、娃和儀,具 体为,侣12t、娃43kg、儀62kg,并将侣烙化成侣液;
[0070] (2)第一次合金化:将娃加入烙炼炉中,并向烙炼炉中加入侣液,加热至720°C,保 溫30min,保溫的同时在侣液表面洒Ikg打渣剂,保溫结束后,化除侣液表面的侣渣,得到合 金侣液;
[0071] (3)第一次炉内精炼:第一次合金化结束后,利用精炼机将精炼剂随氮气充入步骤 (2)的合金侣液中,对合金侣液进行第一次炉内精炼,精炼时间为lOmin,精炼剂用量为9kg;
[0072] (4)第一次取样分析:第一次炉内精炼结束后,化除步骤(3)合金侣液表面的浮渣, 对合金侣液中娃元素进行取样分析,此时,如果娃含量不足,补充娃至合金侣液中娃含量符 合合金侣棒成分要求,同时进行电磁揽拌;
[0073] (5)第二次合金化:调整步骤(4)的合金侣液溫度至720°C,加入儀,并静置IOmin;
[0074] (6)第二次炉内精炼:第二次合金化结束后,利用精炼机将精炼剂随氮气充入步骤 (5)的合金侣液中,对合金侣液进行第二次炉内精炼,精炼时间为lOmin,精炼剂用量为化g;
[0075] (7)第二次取样分析:第二次炉内精炼结束后,化除步骤(6)的合金侣液表面的浮 渣,对合金侣液中儀元素进行取样分析,此时,如果儀含量不足,补充儀至合金侣液中儀含 量符合合金侣棒成分要求,同时进行电磁揽拌;
[0076] (8)诱注系统预热:在合金侣液进行诱注之前,将诱注所用的流槽、分流盘和过滤 板进行预热,预热的溫度为780°C ;
[0077] (9)放流引铸:待步骤(7)合金侣液中的合金成分及溫度达到诱注要求后,开始放 流,诱注要求的合金侣液溫度为78(TC,步骤(7)的合金侣液依次经过流槽、在线除气设备、 过滤板、分流盘和铸模,得到合金侣棒;具体方法为:
[0078] (a)细化处理:待步骤(7)合金侣液中的合金成分及溫度达到诱注要求后,开始放 流,合金侣液流入流槽,此时,同时用喂丝机把Al-STi-IB中间合金线W2.4m/min的速度导 入流槽中对合金侣液进行在线细化处理;Al-STi-IB中间合金线的用量为合金侣液总重量 的 0.2%;
[0079] (b)在线除气:用在线除气设备对步骤(a)细化处理后的合金侣液进行在线除气, 当合金侣液流经在线除气设备底部的流槽时,将合金侣液暂时截流,并启动在线除气设备; 当在线除气设备运行正常且流槽中的合金侣液达到预定液位时继续放流;
[0080] (C)在线除渣:将步骤(b)在线除气后的合金侣液穿过30/50PPi双层泡沫陶瓷过滤 板,对合金侣液进行除渣;30/50PPi双层泡沫陶瓷过滤板放置在过滤箱中,过滤箱和铸模之 间的距离为1.5m;
[0081 ] (d)铸棒:将步骤(C)除渣后的合金侣液通过分流盘引入铸模,铸锭机W180mm/min 的速度完成连续灌注并辅W电磁揽拌,冷却即得。
[0082] 本实施例生产的6063合金侣棒的成分如表2所示。按照原料添加的实际重量,从理 论上计算应该得到Al-O. SlMg-0.36Si合金,实际产品测试得到Al-0.485Mg-0.356Si合金, 计算可得,Mg的实收率= 0.485/0.51 = 95.1 % ;Si的实收率= 0.356/0.36 = 98.9%,显示出 很高的元素实收率。图4是6063合金侣棒的宏观形貌图,从图4可见,合金侣棒表面光滑,无 毛刺、起泡、裂纹等缺陷,铸造质量优异。图5是6063合金侣棒腐蚀前的金相图,从图5可见, 合金侣棒内部无气孔且氧化物杂质含量非常少。据GB3246.1-2012变形侣及侣合金制品第1 部分和第2部分中显微组织检验方法及低倍组织检验方法统计,金相图1.5mm X 1. Omm范围 内长度50-60WI1的杂质数量少于2颗,60-80WI1的杂质数量少于1颗,低于行业标准,体现出很 高的洁净度。图6是6063合金侣棒腐蚀后的金相图,从图6可见,a-Al晶粒尺寸细小,分四个 方向采用截线法统计测量,平均粒径仅为71.26皿。
[0083] 表2 6063合金侣棒化学成分(wt. % ) rn〇R4i
Claims (10)
1. 一种高精度和高洁净度合金铝棒的制备方法,其特征在于,包括以下步骤: (1) 称取原料:按照合金铝棒成分要求,计算并称取所需重量的铝、镁和其它合金元素, 并将铝熔化成铝液;所述的其它合金元素为铜、硅中至少一种; (2) 第一次合金化:将其它合金元素加入熔炼炉中,并向熔炼炉中加入铝液,加热至 700-800°C,保温20-30min,保温的同时在铝液表面洒打渣剂,保温结束后,扒除铝液表面的 铝渣,得到合金铝液; (3) 第一次炉内精炼:第一次合金化结束后,利用精炼机将精炼剂随氩气或氮气充入步 骤(2)的合金铝液中,对合金铝液进行第一次炉内精炼,精炼时间为10-30min; (4) 第一次取样分析:第一次炉内精炼结束后,扒除步骤(3)合金铝液表面的浮渣,对合 金铝液中加入的其它合金元素进行取样分析,此时,如果加入的其它合金元素含量不足,补 充对应的其它合金元素至合金铝液中其它合金元素含量符合合金铝棒成分要求,同时进行 电磁搅拌; (5) 第二次合金化:调整步骤(4)的合金铝液温度至720-760°C,加入镁,并静置10-30min; (6) 第二次炉内精炼:第二次合金化结束后,利用精炼机将精炼剂随氩气或氮气充入步 骤(5)的合金铝液中,对合金铝液进行第二次炉内精炼,精炼时间为10_30min; (7) 第二次取样分析:第二次炉内精炼结束后,扒除步骤(6)合金铝液表面的浮渣,对合 金铝液中镁元素进行取样分析,此时,如果镁含量不足,补充镁至合金铝液中镁含量符合合 金铝棒成分要求,同时进行电磁搅拌; (8) 浇注系统预热:在合金铝液进行浇注之前,将浇注所用的流槽、分流盘和过滤板进 行预热; (9) 放流引铸:待步骤(7)合金铝液中的合金成分及温度达到浇注要求后,开始放流,步 骤(7)的合金铝液依次经过流槽、在线除气设备、过滤板、分流盘和铸模,得到合金铝棒;具 体方法为: (a) 细化处理:待步骤(7)合金铝液中的合金成分及温度达到浇注要求后,开始放流,合 金铝液流入流槽,此时,同时用喂丝机把Al-Ti-B中间合金线导入流槽中对合金铝液进行在 线细化处理; (b) 在线除气:用在线除气设备对步骤(a)细化处理后的合金铝液进行在线除气,当合 金铝液流经在线除气设备底部的流槽时,将合金铝液暂时截流,并启动在线除气设备;当在 线除气设备运行正常且流槽中的合金铝液达到预定液位时继续放流; (c) 在线除渣:将步骤(b)在线除气后的合金铝液穿过过滤板,对合金铝液进行除渣; (d) 铸棒:将步骤(c)除渣后的合金铝液通过分流盘引入铸模,连续灌注并辅以电磁搅 拌,冷却即得。
2. 根据权利要求1所述的高精度和高洁净度合金铝棒的制备方法,其特征在于,所述的 打渣剂用量为每12吨铝液加入l-2kg打渣剂。
3. 根据权利要求1所述的高精度和高洁净度合金铝棒的制备方法,其特征在于,步骤 (3)和(6)两次加入精炼剂的总重量为每吨铝液加0.5-3kg精炼剂,其中,第一次炉内精炼时 加入精炼剂的量为加入精炼剂总重量的60%,第二次炉内精炼时加入精炼剂的量为加入精 炼剂的总重量的40 %。
4. 根据权利要求3所述的高精度和高洁净度合金铝棒的制备方法,其特征在于,步骤 (3)和(6)两次加入精炼剂的总重量为每吨铝液加0.5-2kg精炼剂。
5. 根据权利要求1所述的高精度和高洁净度合金铝棒的制备方法,其特征在于,步骤 (8) 中预热的温度为700-800°C。
6. 根据权利要求1所述的高精度和高洁净度合金铝棒的制备方法,其特征在于,步骤 (9) 中达到浇注要求的合金铝液温度为750-850°C。
7. 根据权利要求1所述的高精度和高洁净度合金铝棒的制备方法,其特征在于,步骤 (a)细化处理中Al-Ti-B中间合金线的用量为合金铝液总重量的0.2%。
8. 根据权利要求1所述的高精度和高洁净度合金铝棒的制备方法,其特征在于,步骤 (a)细化处理中Al-Ti-B中间合金线的导入速度为2.4m/min。
9. 根据权利要求1所述的高精度和高洁净度合金铝棒的制备方法,其特征在于,步骤 (c)中过滤板放置在过滤箱内,过滤箱和铸模之间的距离为1.5m。
10. 根据权利要求1-9任一项所述的高精度和高洁净度合金铝棒的制备方法,其特征在 于,步骤(c)中的过滤板为30/50PPi双层泡沫陶瓷过滤板。
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