本文選題：噴頭　切入點(diǎn)：含能材料　出處：《南京理工大學(xué)》2017年碩士論文

【摘要】：隨著現(xiàn)代武器技術(shù)的不斷發(fā)展,其動(dòng)力源含能材料的傳統(tǒng)成型方式已不適用于加工形狀復(fù)雜多變的藥柱,并且成型過(guò)程安全性低,于是需要引進(jìn)可以自由成型的3D打印加工方式來(lái)規(guī)避這些問(wèn)題。本文在基于傳統(tǒng)熔融沉積成型機(jī)的基礎(chǔ)上,考慮到含能材料的安全性問(wèn)題,提出了含能材料溶劑法3D打印成形,用含能材料代用料進(jìn)行物料性能的基礎(chǔ)研究,設(shè)計(jì)氣壓式擠出噴頭,旨在實(shí)現(xiàn)含能材料的擠出與打印成型。同時(shí)就氣壓與擠出速度之間的預(yù)測(cè)模型進(jìn)行研究。開展了含能材料代用料的流變性能基礎(chǔ)研究。實(shí)驗(yàn)結(jié)果表明:在中等剪切速率區(qū)間,溫度與粘度呈負(fù)相關(guān)關(guān)系,在高剪切速度區(qū)間,剪切速率對(duì)粘度的影響大。在低溫時(shí),溶劑比與粘度呈負(fù)相關(guān)關(guān)系,高溫時(shí)溶劑比對(duì)粘度影響不大。最后對(duì)流變數(shù)據(jù)進(jìn)行分析、擬合,獲取了不同溶劑比與不同溫度下的本構(gòu)模型。進(jìn)行了含能材料3D打印實(shí)驗(yàn)系統(tǒng)噴頭的結(jié)構(gòu)設(shè)計(jì)與制造。成果為:開發(fā)了一款氣壓式擠出噴頭,實(shí)現(xiàn)了含能材料的擠出,最終搭建了3D打印實(shí)驗(yàn)樣機(jī)。并且對(duì)噴頭預(yù)熱情況進(jìn)行溫度分析,發(fā)現(xiàn)物料整體受熱均勻。實(shí)施了入口壓力與流道結(jié)構(gòu)參數(shù)對(duì)擠出速度影響的數(shù)值仿真正交試驗(yàn)研究。研究結(jié)果表明:入口壓力與擠出速度呈正相關(guān)關(guān)系;成型段長(zhǎng)度與擠出速度呈負(fù)相關(guān)關(guān)系;隨著收縮角度的增大與噴嘴直徑的增加,擠出速度沒(méi)有恒定的趨勢(shì),存在一個(gè)最優(yōu)點(diǎn)使得擠出速度最大。采用試驗(yàn)中獲取的結(jié)果數(shù)據(jù),通過(guò)多元線性回歸構(gòu)建了擠出速度與各因素之間的預(yù)測(cè)模型,并且驗(yàn)證了預(yù)測(cè)模型的顯著性。最后根據(jù)預(yù)測(cè)模型計(jì)算得出的擠出速度,匹配打印參數(shù),成功打印出含能材料3D樣品。
[Abstract]:With the development of modern weapon technology, the traditional forming method of energetic material of power source is no longer suitable for the processing of complex and changeable shaped powder, and the safety of molding process is low.Therefore, it is necessary to introduce free-forming 3D printing to avoid these problems.In this paper, based on the traditional melt deposition molding machine, considering the safety of energetic materials, the basic research of material performance is presented in this paper, which is based on solvent 3D printing of energetic materials and substitute materials for energetic materials.The pneumatic extrusion nozzle is designed to realize the extrusion and printing of energetic materials.At the same time, the prediction model between pressure and extrusion velocity is studied.The basic research on rheological properties of energetic substitute materials was carried out.The experimental results show that there is a negative correlation between temperature and viscosity in the range of medium shear rate, and the influence of shear rate on viscosity is great in the region of high shear rate.At low temperature, there is a negative correlation between solvent ratio and viscosity, but at high temperature solvent ratio has little effect on viscosity.Finally, the rheological data were analyzed and fitted, and the constitutive models of different solvent ratios and different temperatures were obtained.The structure design and manufacture of the nozzle of 3 D printing experiment system for energetic materials are carried out.The results are as follows: a pneumatic extrusion nozzle is developed, and the extrusion of energetic materials is realized. Finally, a 3D printing experimental prototype is built.The preheating condition of nozzle is analyzed and the whole material is found to be heated evenly.The effects of inlet pressure and runner structure parameters on extrusion velocity were studied by orthogonal numerical simulation.The results show that the inlet pressure has a positive correlation with the extrusion speed, the length of the molding section is negatively correlated with the extrusion speed, and with the increase of the shrinkage angle and the diameter of the nozzle, there is no constant trend of the extrusion velocity.There is an advantage to maximize extrusion speed.The prediction model between extrusion speed and various factors was constructed by multivariate linear regression using the data obtained from the experiment and the significance of the prediction model was verified.Finally, according to the extrusion speed calculated by the prediction model, the 3D samples of energetic materials were successfully printed by matching the printing parameters.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB34;TP391.73

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