本文選題：熔融沉積成型 + 成型方向　； 參考：《哈爾濱理工大學》2017年碩士論文

【摘要】：熔融沉積成型(Fused Deposition Modeling,FDM)工藝是快速成型制造技術(shù)中應(yīng)用最為廣泛的,但成型件的機械性能與質(zhì)量仍制約著其在更多方面的應(yīng)用。本文以理論分析為依據(jù)設(shè)計工藝試驗,對影響熔融沉積成型制件機械性能的因素進行詳細分析。論文首先對熔融沉積成型的基本原理、成型特點、成型材料等做出詳細說明。然后分析了原理性誤差、工藝性誤差以及后處理誤差的形成機理,并總結(jié)其影響規(guī)律,提出相應(yīng)的解決策略,這為提高制件綜合性能與優(yōu)化成型工藝參數(shù)提供了理論基礎(chǔ)和指導準則。針對熔融沉積成型的填充方式這一工藝參數(shù)設(shè)計實驗,使用PLA(聚乳酸)熱塑性絲材,通過分別改變填充密度、層高度以及填充路徑構(gòu)建若干組試驗樣件。對實驗樣件進行拉伸實驗,整理實驗數(shù)據(jù),分析實驗結(jié)果,比較不同填充密度、不同層高度以及不同填充路徑下試件的抗拉性能及精度之間的差異。并結(jié)合對斷口形貌的宏觀分析與SEM圖像進行分析,判斷試件的斷裂模式。其中,填充密度在90%時斷裂伸長率驟減,較小的層高度會削弱試件的強度,橫向填充路徑下試件的力學性能較好。最后以熔融沉積成型零件的成型方向與成型角度為研究對象,使用ABS熱塑像材料,分別在水平、垂直、豎直各個成型方向中的五個不同成型角度下構(gòu)建實驗樣件。通過拉伸實驗、彎曲實驗與對斷口的顯微圖像觀測相結(jié)合的方法,分別對試件的抗拉極限強度、彈性模量、抗彎強度進行分析與比較,并分別測量各個試件的表面粗糙度值與尺寸,比較不同成型方向與成型角度下表面精度與尺寸精度差異,并結(jié)合對成型時間與成型材料的使用量的測量結(jié)果確定最佳成型方向與成型角度。其中,ZY方向下的成型件其斷裂伸長率明顯低于在YX、YZ方向下的成型件;YZ方向下試件的尺寸相對誤差最小;試件H-0和V-0,具有較高的抗拉強度與彈性模量與抗彎強度,機械性能最好。
[Abstract]:The fused Deposition Modeling (FDM) process is the most widely used in rapid prototyping technology, but the mechanical properties and quality of the molded parts still restrict its application in many fields. Based on the theoretical analysis, the factors influencing the mechanical properties of the fused deposition forming parts are analyzed in detail. Firstly, the basic principle, characteristics and materials of melt deposition molding are described in detail. Then, the forming mechanism of the principle error, the technological error and the post-processing error is analyzed, and the influence law is summarized, and the corresponding solving strategy is put forward. This provides a theoretical basis and guidance for improving the comprehensive properties of the parts and optimizing the molding process parameters. In view of the design experiment of the filling mode of melt deposition, a number of test samples were constructed by changing the filling density, layer height and filling path by using PLA (Poly (lactic acid) thermoplastic filament. The tensile test was carried out, the experimental data were arranged, the experimental results were analyzed, and the difference of tensile properties and precision of the specimens with different filling density, different layer height and different filling paths was compared. The fracture mode of the specimen is judged by the macroscopic analysis of fracture surface and the analysis of SEM image. When the filling density is 90, the elongation at break decreases sharply, and the strength of the specimen is weakened by the lower layer height. The mechanical properties of the specimen are better under the transverse filling path. Finally, taking the forming direction and angle of melt deposition forming part as the research object, using ABS thermoplastic materials, the experimental samples are constructed at five different forming angles in horizontal, vertical and vertical molding directions respectively. The tensile ultimate strength, elastic modulus and flexural strength of the specimen were analyzed and compared by tensile test, bending test and microscopic image observation. The surface roughness and dimension of each specimen were measured, and the difference of surface precision and dimension precision under different forming direction and angle was compared. The best forming direction and angle are determined according to the measurement results of molding time and material usage. The elongation at break of the molded parts in the direction of ZY is obviously lower than that in the direction of YXY and the relative error of the dimension of the specimens in the direction of YZ is the smallest, and the specimens H-0 and V-0 have higher tensile strength, modulus of elasticity and flexural strength, and the mechanical properties are the best.
【學位授予單位】：哈爾濱理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH16

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本文編號：1988484