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    消失模铸造技术:六大方(fāng)法***解析!

    发布时间(jiān): 2019-05-23 来源:洛阳 JDB公司的主业是以基础设施建设工程和冶金矿山等为主题的装备制造业。公司主要产品有凿岩机、凿岩钻车钻架、凿岩钎具和气动工具等四个大类。产品广泛应用于交通设施、水电工程、能源开发、国防建设和机械制造等领域。和顺祥机械有限公司(sī) 点击:1107

    消失模(mó)铸造技术:六(liù)大方法***解析!

    消(xiāo)失模铸造技术是用(yòng)泡(pào)沫塑料(liào)制作成与零(líng)件结构和尺寸完(wán)全一样的实(shí)型(xíng)模具,经浸涂耐火(huǒ)粘(zhān)结涂料,烘(hōng)干后进行干(gàn)砂(shā)造(zào)型,振动紧实,然后浇入金属液(yè)使模样受热气化消失(shī),而得到与模样形状一致的金属零件的铸(zhù)造方法。


    消(xiāo)失模铸造技术主要有(yǒu)以下六种:


    1.压力消失模铸造


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    压力消失模铸造技术(shù)是消失模铸造(zào)技(jì)术(shù)与压力凝固结晶技术相结(jié)合的铸造新技术,它是在(zài)带砂箱的压力灌中(zhōng),浇(jiāo)注金属液使泡(pào)沫塑料气(qì)化(huà)消失后,迅速密封压力灌,并通入一定压力的(de)气体,使金(jīn)属液在压(yā)力下凝(níng)固结晶(jīng)成型的铸(zhù)造方法。


    这种铸造技术的特点(diǎn)是能(néng)够显(xiǎn)著减少铸(zhù)件中的(de)缩孔、缩松、气孔(kǒng)等铸造缺陷,提高铸件致密度,改(gǎi)善(shàn)铸件力学性能(néng)。


    2.真空低压消失(shī)模铸造


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    真空低压消失模(mó)铸造技术是将负压消失模铸(zhù)造(zào)方(fāng)法(fǎ)和(hé)低压反重(chóng)力(lì)浇注方法复(fù)合(hé)而(ér)发展的一种新铸造技术。


    真空(kōng)低压消(xiāo)失模铸造技术的特(tè)点是(shì):综合(hé)了低压铸造与真空消失模(mó)铸造的技术(shù)优势,在可控的(de)气压(yā)下完成(chéng)充型过程,大大提(tí)高了合(hé)金的铸造(zào)充型能(néng)力;与压铸相比,设备投资小(xiǎo)、铸(zhù)件成(chéng)本低、铸件可(kě)热处理强化;而与砂型(xíng)铸造相比,铸件的精度(dù)高、表面(miàn)粗糙(cāo)度小、生产率(lǜ)高、性能好;反重力作用下,直浇口成为补缩短通道,浇注温度的(de)损失小,液态(tài)合(hé)金在可控的(de)压力(lì)下进行补缩(suō)凝(níng)固,合金铸件的浇注系统简(jiǎn)单有效、成品(pǐn)率高、组织致(zhì)密;真空低压(yā)消失模铸造的浇注温度低,适合于多种有色合金。


    3.振动消失模铸造


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    振动消失模铸造技术是在消失模铸造过(guò)程(chéng)中施加一定(dìng)频率和振幅(fú)的振动,使铸件在振动场的作用下凝(níng)固,由于消失模铸(zhù)造凝固过程中对金属溶液施加了一定时间振动,振(zhèn)动力使液相与固(gù)相间产生相(xiàng)对运(yùn)动(dòng),而使枝晶破碎(suì),增加液相(xiàng)内结晶核心,使(shǐ)铸件***终凝固组织细(xì)化、补(bǔ)缩(suō)提高,力学性能改善。


    该(gāi)技(jì)术利用消失模(mó)铸造(zào)中现成的紧(jǐn)实振动台,通过振动电机产生的机械振动,使(shǐ)金(jīn)属液在动力激(jī)励下生(shēng)核(hé),达到细化组织的目的,是(shì)一种操作简便、成本低廉、无环境污染的(de)方法。


    4.半固态消(xiāo)失模铸造


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    半固态消失模铸(zhù)造技术是消失模铸造技术与半固态技(jì)术相结合的新铸造技术,由于该(gāi)工艺的特点在于控制液(yè)固相的相对比例(lì),也(yě)称(chēng)转变控制半固态(tài)成(chéng)形。


    该技(jì)术可(kě)以提高铸件致(zhì)密度、减少偏析、提高尺寸精度和(hé)铸件性能。


    5.消失模壳型铸造(zào)


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    消失模壳型铸造技术是(shì)熔(róng)模铸造技术与消失模铸造(zào)结合起来的新(xīn)型铸造方法。该方法是将用发泡模具制作的与(yǔ)零件(jiàn)形状一样的泡沫塑料模样表面涂上数层耐火材料,待其硬化干燥后,将其(qí)中的泡沫(mò)塑料模样燃烧气化消失而制成(chéng)型壳,经过焙烧,然后(hòu)进行浇注,而获得较高尺寸精度(dù)铸件的一种(zhǒng)新型精密铸造(zào)方法。


    它具有消失模铸造中的模样尺寸大(dà)、精密度高的特点,又有熔模精密铸造中结壳(ké)精度(dù)、强度等优点。与普(pǔ)通熔模(mó)铸造相比,其(qí)特点是泡沫塑料模料成本低廉,模样(yàng)粘接组合(hé)方便,气化消失容易,克服了熔模铸造(zào)模料容易软化而(ér)引起的熔模变形的(de)问题,可以(yǐ)生(shēng)产较大尺寸的各种合金复杂铸件。


    6.消失模悬(xuán)浮铸造


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    消失模悬浮(fú)铸造技术是(shì)消失模铸造(zào)工艺与(yǔ)悬浮铸(zhù)造结合(hé)起来的一种新型实用铸造技(jì)术。该技术工艺过程是金属液浇入铸型后,泡沫塑(sù)料模样(yàng)气化,夹杂在冒口(kǒu)模(mó)型的悬浮剂(或将悬浮剂(jì)放置在模样某特定位置,或将悬浮(fú)剂与EPS一起制(zhì)成泡沫模样)与金属液发生物化(huà)反(fǎn)应从而(ér)提(tí)高铸(zhù)件整(zhěng)体(或部(bù)分(fèn))组(zǔ)织性能。


    由于消失模铸造(zào)技术成本低、精度(dù)高、设计灵(líng)活、清洁环保、适(shì)合复杂铸(zhù)件等(děng)特(tè)点,符(fú)合新世纪铸造技术发(fā)展的总趋势(shì),有(yǒu)着广阔的发展前景。