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首页> 外文期刊>Journal of Imaging Science and Technology >Rapid Prototyping Materials Rheology
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Rapid Prototyping Materials Rheology

机译：快速成型材料流变学

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摘要

A new technology for printing three-dimensional solid objects from computer-generated images is described. The technology is based on extrusion of a thermoplastic polymer melt as small fibers that bond to form the solid object. This technology is referred to as thermoplastic melt extrusion rapid prototyping (RP). Polymer materials for thermoplastic melt extrusion RP must have the ability to form the structural building blocks of the part. These building blocks are walls, shelves, and bridges. The flow and deformation (rheology) of the melt as it is extruded through the circular die and adheres to the layers already in place govern the process. At this exploratory stage of development, there is no model to specify the extrusion conditions and materials properties relationship to RP performance. Ten marginally acceptable RP materials were identified through extensive RP testing. This study presents the preliminary rheological and thermal analytical characterization of these materials. Characterization of the melt properties is fundamental to the development of a constitutive equation for modeling and to an understanding of the process. The most promising RP materials were found to be crystallizing polymers. Isothermal rheometry and calorimetry measurements were performed to study the crystallization kinetics. Solidification due to crystallization during extrusion is expected to play a key role in RP materials performance.
机译：描述了一种用于从计算机生成的图像中打印三维立体对象的新技术。该技术基于热塑性聚合物熔体的挤出，该熔体是粘合成固体的小纤维。这项技术被称为热塑性熔融挤出快速成型（RP）。用于热塑性熔体挤出RP的聚合物材料必须具有形成零件的结构构件的能力。这些构建块是墙壁，架子和桥梁。熔融物通过圆形模具挤出并粘附到已经在适当位置的层上时，其流动和变形（流变学）决定了该过程。在开发的探索阶段，尚无模型来指定挤出条件和材料性能与RP性能的关系。通过广泛的RP测试，确定了十种勉强可以接受的RP材料。这项研究提出了这些材料的初步流变学和热分析表征。熔体特性的表征对于开发用于建模的本构方程和理解过程至关重要。发现最有希望的RP材料是结晶聚合物。进行等温流变法和量热法测量以研究结晶动力学。预计在挤出过程中由于结晶而导致的固化将在RP材料性能中发挥关键作用。

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