本文選題：快速成形 + 翹曲變形　； 參考：《大連理工大學(xué)》2012年碩士論文

【摘要】：熔融沉積快速成形(FDM)工藝以其高度的制造柔性、制件復(fù)雜性和市場(chǎng)需求適應(yīng)性成為目前應(yīng)用最為廣泛的快速成形技術(shù)之一,在快速制造及快速模具方面發(fā)揮重要作用。相對(duì)于其他成形工藝,FDM具有成本低、清潔、安全等特點(diǎn),但是其成形精度不高極大地制約了其適用范圍,提高成形精度對(duì)于FDM成形工藝具有重要的現(xiàn)實(shí)意義。 本文首先對(duì)影響FDM成形制件的尺寸精度、表面質(zhì)量及形狀精度的各種因素做了比較全面的分析,研究成形誤差產(chǎn)生的原因,并提出相應(yīng)對(duì)策。 以FDM成形過(guò)程中制件的翹曲變形為研究對(duì)象,分析變形的產(chǎn)生過(guò)程,建立了成形件翹曲變形的理論模型,提出了翹曲量計(jì)算公式,并定量分析了絲材線收縮系數(shù)、堆積層數(shù)、成形室溫度、試件尺寸和掃描速度對(duì)成形件變形的影響,并總結(jié)相關(guān)規(guī)律。 在理論分析的基礎(chǔ)上,以Fprint型熔融沉積快速成形機(jī)為實(shí)驗(yàn)平臺(tái),以成形制件的翹曲變形量為測(cè)量指標(biāo),針對(duì)成形過(guò)程主要工藝參數(shù)設(shè)計(jì)試件進(jìn)行正交試驗(yàn)。通過(guò)極差圖及方差分析的方法研究了各因素對(duì)翹曲變形的影響規(guī)律及各自的影響程度,得出試驗(yàn)條件下可最大程度減小成形件翹曲變形的因素最優(yōu)組合,提出了減小成形件翹曲變形的相應(yīng)措施。 對(duì)成形室內(nèi)溫度分布規(guī)律做了進(jìn)一步試驗(yàn)研究,分析了X軸方向與Y軸方向的溫度分布及對(duì)制件成形質(zhì)量的影響,對(duì)于不同制件成形加工時(shí)在工作臺(tái)上的放置位置及成形方向具有指導(dǎo)意義。
[Abstract]:Melt deposition rapid prototyping (FDM) process has become one of the most widely used rapid prototyping technologies due to its high manufacturing flexibility, manufacturing complexity and adaptability to market demand. It plays an important role in rapid manufacturing and rapid die. Compared with other forming processes, FDM has the characteristics of low cost, clean and safe, but its precision is not high, which greatly restricts its application range. It is of great practical significance to improve the forming accuracy for FDM forming process. In this paper, the factors that affect the dimensional accuracy, surface quality and shape accuracy of FDM forming parts are analyzed comprehensively, the causes of forming errors are studied, and the corresponding countermeasures are put forward. Taking the warpage deformation of the parts in FDM forming process as the research object, this paper analyzes the process of the deformation, establishes the theoretical model of the warpage deformation of the forming parts, puts forward the formula for calculating the warpage quantity, and quantitatively analyzes the wire linear shrinkage coefficient and the number of stacking layers. The influence of forming chamber temperature, specimen size and scanning speed on the deformation of forming parts is summarized. On the basis of theoretical analysis, the orthogonal experiment was carried out on the basis of the Fprint rapid prototyping machine and the warpage of the forming parts as the measuring index. The main technological parameters of the forming process were designed. By means of range diagram and variance analysis, the influence of various factors on warpage deformation and their influence degree are studied. The optimum combination of factors which can minimize the warpage deformation of formed parts is obtained under the test conditions. The corresponding measures to reduce the warpage of forming parts are put forward. In this paper, the temperature distribution in the forming room is further studied, and the influence of the temperature distribution in the X axis and Y axis on the forming quality of the parts is analyzed. It is of guiding significance for the position and forming direction of different parts on the worktable.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH16

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本文編號(hào)：1952025