成果報告書詳細
管理番号20150000000425
タイトル*平成26年度中間年報 SIP(戦略的イノベーション創造プログラム) 革新的設計生産技術 超3D造形技術プラットフォームの開発と高付加価値製品の創出
公開日2015/7/18
報告書年度2014 - 2014
委託先名国立大学法人横浜国立大学
プロジェクト番号P14030
部署名ロボット・機械システム部
和文要約
英文要約We have worked on a super three-dimensional (3-D) fabrication technology platform and creation of high-value-added products. Our research project consists of five research projects as follows: Project #1 (Development of super 3-D micro/nano fabrication system), Project #2 (Development of omnidirectional microstereolithography system), Project#3 (Development of functional devices using soft and hard 3-D molding), Project #4 (Development of a popular 3-D fabrication system), Project #5 (Open innovation based on popular 3-D fabrication systems). The details of main results are as follows.

Project #1 (Development of super 3-Dmicro/nano fabrication system)
We have constructed a 3-D fabrication system using a femtosecond pulsed laser and a spatial light modulator for the development of ultra high-speed fabrication system. By modulating the phase distribution of the laser beam with the spatial light modulator, doughnut beams with different diameters were formed to achieve variable resolution. In experiments, we evaluated the linewidths of drawing lines by changing the diameter of the doughnut beam. It was demonstrated that the linewidth ranged from 1 to 3 m. This feature allows us to improve the fabrication speed of 3-D micro/nano fabrication system, because the linewidth can be adjusted according to the required resolution.
In addition, a 3-D CAD software using Fast Marching Method was developed to create hollow models. Since the hollow models can be fabricated within a short time compared with solid models, total fabrication time of 3-D models can be drastically reduced.

Project #2 (Development of omnidirectional microstereolithography system)
We have developed a novel type of microstereolithography system using optical fibers. In this system, use of optical fibers with different core diameters makes possible to provide multi-scale resolution ranging from 1 to 150 m. In experiments, it was demonstrated that linewidth could be controlled by changing both the core diameter of the optical fiber and laser power. 3-D models such as pyramidal models were also fabricated by scanning the optical fiber. In the next stage, we intend to develop an omnidirectional microstereolithography system using optical fibers.

Project#3 (Development of functional devices using soft and hard 3-D molding)
To improve the fabrication accuracy of ceramic molding process, we evaluated the shrinkage ratios of block-like structures. As a result, the fabrication accuracy attained to less than several percentages by optimizing the procedure of molding process and the offset of 3-D models. As an application of functional ceramic microstructures, we intend to develop a high-precision assembling system of complex 3-D microparts. To construct the assembling system, a control software based on inverse kinematics was developed to drive and control 5-axis robotic system.
In addition, soft molding process with silicone molds was used for the development of 3-D artificial livers. In cell culture experiments, effects of hydrostatic pressure on angiogenesis were investigated in a newly designed culture device using a biocompatible hydrogel. Appropriate hydrostatic pressure accelerated sprouting and luminal structure formation of endothelial cells in a hydrogel. To create 3-D molds for artificial vessels, cylindrical and tapered microneedles were produced by microstereolithography, and then they were coated with gold. The microneedles will be applied to create artificial livers with artificial vessels.

Project #4 (Development of a popular 3-D fabrication system)
To develop a popular 3-D fabrication system, we explored suitable laser wavelength to achieve around 1 m resolution. In experiments, we used two lasers whose wavelengths are 405 nm and 532 nm.
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