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铸造工艺

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   铝合金铸造工艺性能,通常理解为在充满铸型、结晶和冷却过程中表现最为突出的那些性能的综合。流动性、收缩性、热烈性、气密性、铸造应力、吸气性。铝合金这些特性取决于合金的成分,但也与铸造因素、合金加热温度、铸型的复杂程度、浇冒口系统、浇口形状等有关。 

(1) 流动性

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(2) SHOUSUOXING

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u2电竞(3) RELIEXING

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在金澄精密的生产中我们都通常采用退让性铸型,或改进铸铝合金的浇注系统等措施,使铝铸件避免产生裂纹。通常采用热裂环法检测铝铸件热裂纹。 

(4) 气密性

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(5) 铸造应力

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(6) 吸气性

铝合金易吸收气体,是铸造铝合金的主要特性。液态铝及铝合金的组分与炉料、有机物燃烧产物及铸型等所含水分发生反应而产生的氢气被铝液体吸收所致。 

铝合金熔液温度越高,吸收的氢也越多;在700℃时,每100g铝中氢的溶解度为0.5~0.9,温度升高到850℃时,氢的溶解度增加2~3倍。当含碱金属杂质时,氢在铝液中的溶解度显著增加。 

铸铝合金除熔炼时吸气外,在浇入铸型时也会产生吸气,进入铸型内的液态金属随温度下降,气体的溶解度下降,析出多余的气体,有一部分逸不出的气体留在铸件内形成气孔,这就是通常称的“针孔”。气体有时会与缩孔结合在一起,铝液中析出的气体留在缩孔内。若气泡受热产生的压力很大,则气孔表面光滑,孔的周围有一圈光亮层;若气泡产生的压力小,则孔内表面多皱纹,看上去如“苍蝇脚”,仔细观察又具有缩孔的特征。 

ZHULVHEJINYEZHONGHANQINGLIANGYUEGAO,ZHUJIANZHONGCHANSHENGDEZHENKONGYEYUEDUO。LVZHUJIANZHONGZHENKONGBUJINJIANGDILEZHUJIANDEQIMIXING、NAISHIXING,HAIJIANGDILEHEJINDELIXUEXINGNENG。YAOHUODEWUQIKONGHUOSHAOQIKONGDELVZHUJIAN,GUANJIANZAIYURONGLIANTIAOJIAN。JINCHENGJINGMIZAIRONGLIANSHIHUITIANJIAFUGAIJIBAOHU,ZHEIYANGHEJINDEXIQILIANGJIUHUIDAWEIJIANSHAO。DUILVRONGYEZUOJINGLIANCHULI,KEYOUXIAOKONGZHILVYEZHONGDEHANQINGLIANG。


image.png  温岭市松门镇南咸田村工业区

image.png  0576-8611 4991

image.png  13705861120

image.png  [email protected]

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