Study on three dimensional Photofabrication for Prototyping Model

主要研究成果如下：分析了光致聚合物的基本固化形态。对于将一系列凝固点组合成三维模型的快速原型系统，对凝固基本单元进行了评估。光致聚合物固化形状的基本分析由于光致聚合物的固化特性决定了固化形状，因此分析其固化机理是很重要的。研制了一套测量系统，实现了紫外光激光功率分布与固化树脂形状的时间和空间对应。还测量了光致聚合物模型的光学特性。激光位置离焦对重叠曝光时凝固深度和表面粗糙度的影响。实验研究了舱口间距hs和激光半径w的比值hs/w的影响。TH…树脂表面位移越大、焦点位置越大，深度越小。重叠率越小，深度越长。重叠比hs/w越小，表面粗糙度越大，与hs/w越小，表面粗糙度越小的数学预测相反。研制了一种快速成型系统的光点转移工具，该工具将少量光致聚合物挤压平整，并在紫外点光源曝光的工作上供货。对配备该工具的快速成型系统所制得的光致聚合物的凝固形态进行了评价。基于非接触式测量系统的三维模型形状评价与重建系统研制了造型模型重建系统，该系统利用非接触式数字化系统测量模型形状并存储为数据，利用三维光刻系统再现光刻模型。较少

The results of our research are as follows :The fundamental solidification shape of photopolymer is analyzed. The solidification basic unit is evaluated for a rapid prototyping system which combines series of solidified spots to a three dimensional model.1. A fundamental analysis of solidified photopolymer shapesAs the solidification characteristics of photopolymer define solidified shapes, it is important to analyze the solidification mechanism. We developed a measurement system which enables the time and the space correspondence of the UV laser's power distribution and the solidified resin shape. An optical characteristic was also measured for photopolymer modeling.2. The evaluation of solidified shapes which produced by the combination of solidified spots.The effects of defocus of laser position were experimented about the solidified depth and surface roughness when overlapping exposure was used. The effect of hatch space hs and the ratio hs/w of laser radius w were experimented. Th … More e depth was decreased where the displacement of resin surface and focus position was bigger. The depth is longer where the overlapping ratio was smaller. Surface roughness was bigger where the overlapping ratio hs/w was smaller contrary to the mathematical prediction that the surface roughness was smaller where the hs/w was smaller.3. Design of spot transfer tool and evaluation of shape forming of the rapid prototyping systemA spot transfer tool was developed which a small amount of photopolymer was leveled with squeeze and supplied on a work exposed by UV spot light. The solidified shapes of photopolymer were evaluated which was produced by the rapid prototyping system equipped with this tool.4. The evaluation and reconstruction system for the three dimensional model shapes with non-contact measurement systemThe reconstruction system for styling models was developed which measured the model shapes and stored as data with non-contact digitizing system and reproduced Photofabrication model with three dimensional photofabrication system. Less