摘要本文采用熔融沉积成型法对PLA线材进行打印，并对PLA线材及打印模型进行一系列的实验。分别采用电子万能试验机、热分析仪、红外光谱仪和显微拉曼光谱仪对PLA线材进行力学性能、热学性能及结构成分进行测定。采用维氏显微硬度计对不同打印参数的打印模型进行力学性能检测。PLA的物理性能与多数高分子聚合物接近，有较高的抗拉强度，玻璃转变温度在65℃~70℃，冷结晶温度在90℃~116℃，熔融温度在164℃~178.5℃。打印喷嘴温度和打印平台温度的设定对PLA力学性能均有一定影响。根据这些结论，可以对PLA在实际生产中的加工进行优化。48021

关键词  三维打印  聚乳酸  性能  应用

毕业论文设计说明书外文摘要

Title    The Properties of PLA Wire for Three-Dimention Priting  and Optimization of Printing Process                                                

Abstract

In this paper, fused deposition modeling method is applied for printing wire PLA, and a series of experiments were carried out to study the properties of PLA and the printing models. were used, for PLA wires’ mechanical properties, thermal properties ,structural and composition were studied by electronic universal testing machine, thermal analyser, infrared spectrometer and micro Raman spectrometer. Mechanical properties of printing models of different printing parameters were detected by Vickers microhardness tester.The physical properties of the PLA is close to polymers. PLA wires have a higher tensile strength, and glass transition temperature is at 65 ℃ ~ 70 ℃, cold crystallization temperature is at 90 ℃ ~ 116 ℃, melting temperature is at 164 ℃ ~ 178.5 ℃. The setting of the temperature of the printing nozzle and the printing platform has a certain influence on the mechanical properties of PLA. According to these conclusions, the processing of PLA printing in the actual production can be optimized.

Keywords  Three-dimensional  Polylactic  Properties  Application

目   次

1  引言 1

1.1  三维打印简介 1

1.1.1  三维打印叠加成型工艺分类 1

1.1.2  熔融沉积成型（FDM）简介 1

1.2  三维打印耗材简介 2

1.2.1  三维打印耗材分类 2

1.2.2  聚乳酸简介 2

1.3  三维打印的发展现状与应用前景 3

1.3.1  三维打印的发展史与发展现状 3

1.3.2  三维打印技术的应用前景 3

1.4  本文的主要研究内容与意义 4

2  实验方法与实验条件 5

2.1  实验原材料 5

2.2  实验设备与方法 5

2.2.1  实验设备 5

2.2.2  实验方法 6

2.3  PLA线材性能分析方法 7

2.3.1  拉伸性能测试 7

2.3.2  热学性能测试 7

2.3.3  光谱分析 7

2.4  打印试样的力学性能检测