【摘要】：水溶型芯以其高效水溶潰散性能和優(yōu)異環(huán)境友好特性在帶有復(fù)雜內(nèi)腔及彎曲孔道的鋁合金鑄件中有著廣泛的應(yīng)用。傳統(tǒng)的成型方法,在型芯制備過(guò)程中都需要采用制芯模具,這使得制芯過(guò)程復(fù)雜、制造周期長(zhǎng)等制約水溶型芯的發(fā)展。無(wú)�；焖俪尚渭夹g(shù)因其設(shè)計(jì)和制造一體化,成形過(guò)程柔性化、主體化和多樣化等優(yōu)勢(shì)在鑄造領(lǐng)域取得了快速發(fā)展。因此,本文采用快速成型方法中的微滴噴射成型技術(shù),以碳酸鉀溶液為粘結(jié)劑,寶珠砂作為成形粉末,系統(tǒng)的研究了成型工藝過(guò)程各參數(shù)及后處理工序?qū)μ妓徕浰苄托拘阅艿挠绊?以期獲得高強(qiáng)度、水溶性好的水溶型芯。本文的主要內(nèi)容如下:1)采用Flow-3D數(shù)值模擬的方法,研究了不同濃度的碳酸鉀溶液在成形粉末多孔介質(zhì)中的滲透深度,為確定鋪粉層厚提供依據(jù)。研究結(jié)果確定鋪粉層厚為0.035cm。2)成形工藝參數(shù)對(duì)型芯的性能有重要影響。本研究采用單因素變量法分別研究碳酸鉀溶液濃度、不同加熱溫度和添加劑含量對(duì)微滴噴射成形碳酸鉀水溶型芯初始抗拉強(qiáng)度的影響。研究結(jié)果表明,微滴噴射成形碳酸鉀水溶型芯的初始抗拉強(qiáng)度,隨著碳酸鉀溶液濃度的增加先增大后減小,隨著初始加熱溫度的升高也是先增大后減小,隨著添加劑含量的增加而降低。3)后處理工序可增強(qiáng)水溶型芯的強(qiáng)度。本研究探究了浸潤(rùn)溶液濃度、浸潤(rùn)前和浸潤(rùn)后燒結(jié)溫度、保溫時(shí)間對(duì)型芯抗拉強(qiáng)度的影響規(guī)律。研究結(jié)果表明,添加了膨潤(rùn)土的初始型芯經(jīng)燒結(jié)后可以浸潤(rùn),且浸潤(rùn)溶液濃度為50%時(shí),獲得的型芯的強(qiáng)度較好;浸潤(rùn)后不同燒結(jié)溫度下的不同保溫時(shí)間對(duì)型芯抗拉強(qiáng)度的影響規(guī)律不同,不僅粘結(jié)劑溶液的濃度對(duì)其結(jié)晶形貌有影響,不同燒結(jié)溫度、保溫時(shí)間也會(huì)對(duì)結(jié)晶形貌產(chǎn)生影響,并影響著型芯的斷裂方式和斷口形貌。經(jīng)過(guò)后處理的水溶型芯的抗拉強(qiáng)度可達(dá)2MPa以上。4)對(duì)成形后水溶型芯的水溶潰散性進(jìn)行研究。研究結(jié)果表明,采用微滴噴射成形及后處理工序得到的水溶型芯的潰散性能優(yōu)異,可用于復(fù)雜結(jié)構(gòu)鋁合金鑄件的澆注。
[Abstract]:Water soluble core has been widely used in aluminum alloy castings with complex cavities and curved channels because of its high efficiency water solution collapsibility and excellent environmental friendliness. Traditional molding methods require core-making mould in the process of core preparation, which makes the core-making process complex and the manufacturing cycle long, which restricts the development of water-soluble core. Because of its advantages of integration of design and manufacture, flexibility of forming process, mainstay and diversification, mouldless rapid prototyping technology has made rapid development in the field of casting. Therefore, in this paper, the micro-droplet spray molding technology in the rapid prototyping method is used, the potassium carbonate solution is used as the binder, and the pearl sand is used as the forming powder. The effects of the parameters of the molding process and the post-treatment process on the properties of the water-soluble core of potassium carbonate were studied systematically in order to obtain the water-soluble core with high strength and good water solubility. The main contents of this paper are as follows: (1) the permeation depth of different concentrations of potassium carbonate solution in powder porous media is studied by Flow-3D numerical simulation, which provides a basis for determining the thickness of powder layer. The results show that the thickness of the powder layer is 0.035cm.2) forming process parameters have an important effect on the properties of the core. The effects of concentration of potassium carbonate solution, heating temperature and additive content on the initial tensile strength of water-soluble potassium carbonate core were studied by single factor variable method. The results show that the initial tensile strength of micro-droplet spray forming potassium carbonate water-soluble core increases first and then decreases with the increase of the concentration of potassium carbonate solution, and then decreases with the increase of initial heating temperature. With the increase of additive content, the strength of water-soluble core can be enhanced. The effects of the concentration of soakage solution, sintering temperature before and after soaking and holding time on the tensile strength of the core were investigated. The results show that the initial core with bentonite can be sintered and the strength of the core is better when the concentration of soaking solution is 50. The effect of different sintering time on the tensile strength of the core is different, not only the concentration of the binder solution has an effect on the crystalline morphology, but also the sintering temperature and the holding time have an effect on the crystalline morphology. The fracture mode and fracture morphology of the core are also affected. After treatment, the tensile strength of the water-soluble core can reach 2MPa above 4. 4) the water-soluble collapsibility of the formed water-soluble core is studied. The results show that the water-soluble core obtained by micro-droplet spray forming and post-treatment has excellent collapsibility and can be used for casting of aluminum alloy with complex structure.
【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TG242.7

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