National Chung Cheng University Institutional Repository:Item A095B0000Q/263
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    题名: DLP積層製造光罩補償之研究;The Research on Mask Compensations for DLP Additive Manufacturing
    作者: 陳榆泓;CHEN, YU-HONG
    贡献者: 機械工程系研究所
    关键词: 積層製造;光罩補償;DLP;像素灰階處理;Additive manufacturing;Mask compensation;DLP;Pixel gray scale processing
    日期: 2017
    上传时间: 2019-07-17
    出版者: 機械工程系研究所
    摘要: 近幾年科技的日新月異,電腦技術的發展運用在積層製造上已有多年,在製造領域面越來越被廣泛的利用。其中優點在於可簡化生產複雜的工件,並且不須額外的鑄模程序,大幅縮短了產品設計的時間與成本。設計者使用電腦軟體設計物件模型,經過切層製造軟體輸出檔案後,再將其檔案輸入至機台上,就可直接生產所設計物件。此生產過程方便於設計或修改模型,因此能因應於各領域快速開發成型之需求。 本文重點著重在於發展一個積層製造軟體,適用於DLP (Digital Light Processing)製造形式之3D列印機。DLP技術屬於積層製造中,精度較高的一種製造成形模式。其生產步驟為先使用CAD軟體設計物件模型,經過積層製造軟體進行切層處理,再由3D的實體模型轉換成2D輪廓,進一步轉換成光罩,最後輸入至DLP形式之3D列印機台進行物件成形列印。 設計之模型是由許多三角網格於物件表面構成,因此模型之網格密集程度會直接影響產品的精度,當模型之網格越集中密集時,所列印出之產品精度越接近於原本設計之模型。研究利用光罩的補償進行列印成形物件尺寸不足的部分,而DLP機台所讀入之檔案為圖檔進行列印,本研究也利用像素不同灰階值處理進行物件列印分析,可使物件邊緣較平滑。 本文中,方形5*5、10*10、15*15、20*20、25*25(mm)這五種平均尺寸誤差百分比降低約1.5%。在中空物件中,以20*20mm物件進行近一步討論,尺寸誤差降低約2%。而在物件邊緣平滑度上,平均Ra.值約降低1.2um。
    In recent years, science and technology changes rapidly, the development of computer technology has been used in the manufacture for many years. In the manufacturing sector is increasingly widely used. The advantage is that it simplifies the production of complex workpieces, and no additional molds are required, greatly reducing the time and cost of product design. Designers use computer software to design object models, after the software output image file, and then enter the image file to the machine can directly produce the design of objects. This production process facilitates the design or modification of the model and is therefore responsive to in all areas the rapid development of molding requirements.This research focuses on the development of additive manufacturing software, suitable for DLP (Digital Light Processing) manufacturing of the 3D printer. DLP technology belongs to the additive manufacturing, the higher precision of a manufacturing forming mode. The first step for the production processes is using of CAD software design object model, through the additive manufacturing software for layering. The second step is by the 3D solid model into a two-dimensional profile and further converted into a mask. The final step is input to the DLP form of the 3D printing machine for object forming print.The design of the model is composed of many triangular meshes on the surface of the object, so the grid density of the model will directly affect the accuracy of the product. When the grid of the model is denser, the precision of the printed products is closer to the original design the model. In this research, we use the compensation of the mask to print the missing parts of the forming object, and the files read by the DLP machine are printed for the picture file. This study also uses pixel different gray value processing for object printing analysis, can make the object edge smoother. In this research, the five average dimension error percentages of the square 5 * 5, 10 * 10, 15 * 15, 20 * 20, 25 * 25 (mm) are reduced by about 1.5%. In the hollow object, the 20 * 20 mm object is discussed in detail, and the dimensional error is reduced by about 2%. In the edge smoothness of the object, the Ra. value is reduced by about 1.2um.
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