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      Improving the dimensional accuracy of micro parts 3D printed with projection-based continuous vat photopolymerization using a model-based grayscale optimization method

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      Author(s)
      Guven, Ege
      Karpat, Yigit
      Cakmakci, Melih
      Date
      2022-09
      Source Title
      Additive Manufacturing
      Print ISSN
      2214-8604
      Electronic ISSN
      2214-7810
      Publisher
      Elsevier
      Volume
      57
      Pages
      1 - 14
      Language
      English
      Type
      Article
      Item Usage Stats
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      27
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      Abstract
      Micro-scale additive manufacturing has seen significant growth over the past years, where improving the accuracy of complex micro-scale geometries is seen as an important challenge. Using grayscale images rather than black and white images during production is an effective method to improve the fabrication quality. This paper presents a model-based optimization method for improving the dimensional accuracy of parts using voxel-based grayscale dynamic optimization during continuous 3D printing. A detailed solidification model has been developed and used to estimate the curing dynamics of the resin used in 3D printing. The irradiance of the light beam projected for each pixel influences a larger volume on the resin than the targeted voxel. The proposed model-based method optimizes the images considering the light distribution from all closely related pixels to maintain the accuracy of the micro part. The results of this method have been applied to the printing of a complex 3D part to show that optimized grayscale images improve the areas with overcuring significantly. It is shown that the number of overcured voxels was reduced by 24.7% compared to the original images. Actual printing results from our experimental setup confirm the improvements in the accuracy and precision of the printing method.
      Keywords
      Process planning
      Vat photopolymerization
      Modeling
      Dynamic optimization
      Permalink
      http://hdl.handle.net/11693/111239
      Published Version (Please cite this version)
      https://doi.org/10.1016/j.addma.2022.102954
      Collections
      • Department of Industrial Engineering 758
      • Department of Mechanical Engineering 373
      • Institute of Materials Science and Nanotechnology (UNAM) 2258
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