面向激光三维打印的覆膜粉体材料研发

发布时间：2018-06-26 12:16

本文选题：三维打印 + 酚醛树脂　；参考：《大连理工大学》2015年硕士论文

【摘要】：近年来,三维打印技术以其独特的优势在学术界、产业界掀起了一股三维打印热潮。三维打印是根据所设计的三维模型,利用高分子塑料、光敏树脂、金属粉末、覆膜粉体等材料,通过逐层叠加材料来实现由二维图形到三维模型的制造,集cAD、CAE、CAM等计算机技术于一体,具有快速性、高柔性、高效性等特点,特别适合于制造小批量的复杂结构模型,其产品已在汽车制造、航空航天等领域有所应用。本文结合数字化铸造技术,对三维打印用覆膜粉体材料进行研究。针对传统铸造用覆膜砂在3D打印时强度低的问题,首先设计合理的覆膜工艺,之后通过扩大原砂粒度配级及加入偶联剂的方法增强型砂强度,探究覆膜砂固化过程中各参数对其强度的影响,用PIRP方法打印铸造用铸型。为解决复杂冷铁制作周期长、难于制作的问题,研发可用于三维打印并可在铸造生产中发挥激冷作用的覆膜铁粉,通过实验探究覆膜工艺,确定各个物料加入的比例及混砂时间,通过保温炉加热、实际浇铸、数值模拟的手段验证其激冷作用。最后,为配合三维打印在文化创意中的应用,研发可制作三维打印原型件的轻质覆膜材料,通过实验确定各个物料的配制比例,探究合理的覆膜方法和后处理的工艺参数。
[Abstract]:In recent years, 3D printing technology with its unique advantages in academia, industry has set off a wave of 3D printing boom. Three-dimensional printing is based on the design of three-dimensional model, using polymer plastics, Guang Min resin, metal powder, coated powder and other materials, through layer by layer superposition material to achieve two-dimensional graphics to three-dimensional model manufacturing. With the advantages of fast speed, high flexibility, high efficiency and so on, it is especially suitable for manufacturing complex structural models in small batches. Its products have been applied in automobile manufacturing, aerospace and other fields. In this paper, film-coated powder materials for three-dimensional printing were studied by digital casting technology. In order to solve the problem of low strength of traditional coated sand in 3D printing, a reasonable coating process was designed, and then the strength of sand was enhanced by expanding the gradation of original sand grain and adding coupling agent. To explore the influence of various parameters on the strength of coated sand during solidification, the casting mould was printed by PIRP method. In order to solve the problem that complex cold iron has long production cycle and is difficult to be made, a coated iron powder which can be used in 3D printing and can play a chilling role in casting production has been developed, and the film coating technology has been explored through experiments. The proportion and mixing time of each material are determined, and the cooling effect is verified by means of heat preservation furnace, actual casting and numerical simulation. Finally, in order to cooperate with the application of 3D printing in culture and creativity, the light laminating materials which can make 3D printing prototypes are developed. The preparation ratio of each material is determined through experiments, and the reasonable coating method and post-processing technological parameters are explored.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.3;TN249

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