本文選題：熔模精鑄　切入點：尼龍纖維　出處：《南昌航空大學》2017年碩士論文　論文類型：學位論文

【摘要】：熔模精密鑄造技術是航空航天高精度復雜結構零部件成形的主要方法之一。傳統(tǒng)熔模精鑄制殼周期長,涂層漿料干燥慢;型殼濕強度較低,搬運過程中易破損;型殼殘留強度偏高,脫殼性差;型殼透氣性較差,影響鑄件質量,且強度和透氣性存在相互制約的關系。通過加入尼龍纖維增強型殼,研究纖維含量和長度對硅溶膠漿料及型殼性能的影響,為型殼制備提供理論指導。本文采用尼龍纖維增強硅溶膠型殼,尼龍纖維加入到硅溶膠漿料中,通過攪拌作用對硅溶膠漿料中的尼龍纖維進行分散,研究尼龍纖維含量和長度對硅溶膠漿料及型殼性能的影響規(guī)律,分析尼龍纖維對硅溶膠型殼的增強機制,優(yōu)化尼龍纖維增強硅溶膠型殼的焙燒工藝。實驗結果表明,攪拌作用可有效地改善尼龍纖維在漿料中的分散性,當攪拌轉速為210n/min時,纖維分散較為均勻;當纖維含量在0%~0.75%,纖維長度在2mm~6mm時,隨著纖維含量和長度的增加,漿料運動粘度逐漸增大,型殼掛漿質量與各方向的涂掛厚度也逐漸增大;隨著纖維含量和長度的增加,型殼的常溫抗彎強度呈先增大后減小,焙燒后抗彎強度呈先增大后減小再增大,焙燒后透氣率呈先增大后減小;當纖維含量為0.60%時,型殼常溫抗彎強度為最大值3.06MPa,纖維長度為4mm時,型殼常溫抗彎強度為最大值2.92MPa;當纖維含量為0.45%時,型殼焙燒后抗彎強度為最小值3.96MPa,纖維長度為5mm時,型殼焙燒后抗彎強度為最小值4.03MPa;當纖維含量為0.60%時,型殼透氣率為最大值3.25,纖維長度為5mm時,型殼透氣率為最大值3.42。通過攪拌作用對硅溶膠漿料中的尼龍纖維進行分散,以及尼龍纖維含量和長度對硅溶膠漿料及其型殼性能影響的研究,當纖維長度在4mm~5mm,纖維含量在0.45%~0.60%時,型殼的抗彎強度和透氣性綜合性能較好,為高質量復雜鑄件的生產提供理論和技術指導。
[Abstract]:Investment casting technology is one of the main forming methods for aerospace parts with high precision and complex structure. Traditional investment casting has long shell making period, slow drying of coating slurry, low wet strength of mold shell and easy breakage during handling. The residual strength of mould shell is high and the exfoliation property is poor, the air permeability of mould shell is poor, and the quality of casting is affected, and the relationship between strength and permeability is restricted. The effects of fiber content and length on the properties of silica sol slurry and shell were studied in order to provide theoretical guidance for the preparation of mold shell. In this paper, nylon fiber was used to reinforce silica sol shell, nylon fiber was added to silica sol slurry, and nylon fiber was added to silica sol slurry. The effects of nylon fiber content and length on properties of silica sol size and shell were studied by agitation, and the reinforcing mechanism of nylon fiber on silica sol shell was analyzed. The roasting process of nylon fiber reinforced silica sol shell was optimized. The experimental results showed that the dispersion of nylon fiber in the slurry could be effectively improved by stirring. When the stirring speed was 210 n/ min, the dispersion of nylon fiber was more uniform. When the fiber content is 0.75 and the fiber length is 2mm or 6mm, with the increase of fiber content and length, the kinematic viscosity of the slurry increases gradually, and the quality and the coating thickness of the mould shell slurry increase gradually, and with the increase of fiber content and length, The bending strength of the shell at room temperature increased first and then decreased, the bending strength increased first and then decreased after calcination, the air permeability increased first and then decreased after calcination, and when the fiber content was 0.60%, The maximum bending strength at room temperature is 3.06MPa, and the maximum value is 2.92MPa when the fiber length is 4mm, when the fiber content is 0.45, the flexural strength is 3.96MPa, and the fiber length is 5mm, when the fiber content is 0.45, the bending strength of the shell is 3.96MPa, the fiber length is 5mm, the bending strength of the shell is 3.96MPa, and the fiber length is 5mm. When the fiber content is 0.60, the maximum air permeability of the shell is 3.25, and the air permeability of the shell is 3.42. The nylon fiber in the silica sol slurry is dispersed by stirring. The effect of nylon fiber content and length on the properties of silica sol paste and its shell is also studied. When the fiber length is 4 mm or 5 mm and the fiber content is 0.45 ~ 0.60, the bending strength and air permeability of the shell are better. To provide theoretical and technical guidance for the production of high quality complex castings.
【學位授予單位】：南昌航空大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG249.5

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