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首页> 外文期刊>Rapid prototyping journal >Cure depth control for complex 3D microstructure fabrication in dynamic mask projection microstereolithography
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Cure depth control for complex 3D microstructure fabrication in dynamic mask projection microstereolithography

机译：动态掩模投影微立体光刻中复杂3D微结构制造的固化深度控制

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摘要

Purpose - The paper's aim is to explore a method using light absorption for improving manufacturing of complex, three-dimensional (3D) micro-parts with a previously developed dynamic mask projection microstereolithography (MSL) system. A common issue with stereolithography systems and especially important in MSL is uncontrolled penetration of the ultraviolet light source into the photocrosslinkable resin when fabricating down-facing surfaces. To accurately fabricate complex 3D parts with down-facing surfaces, a chemical light absorber, Tinuvin 327 was mixed in different concentrations into an acrylate-based photocurable resin, and the solutions were tested for cure depths and successful micro-part fabrication. Design/methodology/approach - Tinuvin 327 was selected as the light absorber based on its high absorption characteristics (～0.4) at 365 nm (the filtered light wavelength used in the MSL system). Four concentrations of Tinuvin 327 in resin were used (0.00, 0.05, 0.10, and 0.15 percent (w/w)), and cure depth experiments were performed. To investigate the effects of different concentrations of Tinuvin 327 on complex 3D microstructure fabrication, several microstructures with overhanging features such as a fan and spring were fabricated. Findings - Results showed that higher concentrations of Tinuvin 327 reduced penetration depths and thus cure depths. For the resinwith 0.15 percent (w/w) of the Tinuvin 327, a cure depth of ～30μm was achieved as compared to ～200μm without the light absorber. The four resin solutions were used to fabricate complex 3D microstructures, and different concentrations of Tinuvin 327 at a given irradiance and exposure energy were required for successful fabrication depending on the geometry of the micro-part (concentrations of 0.05 and 0.1 percent (w/w) provided the most accurate builds for the fan and spring, respectively). Research limitations/implications - Although two different concentrations of light absorber in solution were required to demonstrate successful fabrication for two different micro-part geometries (a fan and spring), the experiments were performed using a single irradiance and exposure energy. A single solution with the light absorber could have possibly been used to fabricate these micro-parts by varying irradiance and/or exposure energy, although the effects of varying these parameters on geometric accuracy, mechanical strength, overall manufacturing time, and other variables were not explored. Originality/value - This work systematically investigated 3D microstructure fabrication using different concentrations of a light absorber in solution, and demonstrated that different light absorption characteristics were required for different down-facing micro-features.
机译：目的-本文的目的是探索一种利用光吸收的方法，以利用先前开发的动态掩模投影微立体光刻（MSL）系统来改善复杂的三维（3D）微型零件的制造。立体光刻系统的一个普遍问题，尤其是在MSL中的重要问题是，在制作朝下的表面时，紫外线光源无法控制地渗透到可光交联的树脂中。为了准确地制造具有朝下表面的复杂3D零件，将化学光吸收剂Tinuvin 327以不同的浓度混合到丙烯酸酯基光固化树脂中，并对溶液的固化深度和成功的微型零件制造进行了测试。设计/方法/方法-Tinuvin 327被选为吸光剂是因为它在365 nm（MSL系统中使用的滤光波长）的高吸收特性（〜0.4）。使用树脂中的四种浓度的Tinuvin 327（0.00、0.05、0.10和0.15％（w / w）），并进行了固化深度实验。为了研究不同浓度的Tinuvin 327对复杂的3D微结构制造的影响，制造了一些具有悬垂特征的微结构，例如风扇和弹簧。结果-结果表明，较高浓度的Tinuvin 327会降低渗透深度，从而降低固化深度。对于Tinuvin 327的0.15％（w / w）的树脂，与没有吸光剂的〜200μm相比，固化深度为〜30μm。四种树脂溶液用于制造复杂的3D微结构，成功制造所需的给定辐照度和曝光能量下的不同浓度的Tinuvin 327，取决于微型零件的几何形状（浓度为0.05和0.1％（w / w） ）分别为风扇和弹簧提供了最精确的构造。研究的局限性/意义-尽管需要两种不同浓度的溶液中的光吸收剂来证明成功制造出两种不同的微型零件几何形状（风扇和弹簧），但是使用单个辐照度和曝光能量进行了实验。尽管改变这些参数对几何精度，机械强度，总制造时间和其他变量的影响没有，但使用光吸收剂的单一解决方案可能已经通过改变辐照度和/或曝光能量来制造这些微型零件。探索。原创性/价值-这项工作系统地研究了在溶液中使用不同浓度的光吸收剂的3D微结构制造过程，并证明了不同的朝下微特征需要不同的光吸收特性。

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