The Development of Micro Rapid Prototyping System based on Spray Coating Technology

• Main Authors: Ming-Zhe Hsieh, 謝明哲
• Other Authors: 汪家昌
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/t67pr3

博士 === 國立臺北科技大學 === 機電科技研究所 === 97 === The Rapid Prototyping(RP) technology is a material additive process to build parts layer by layer automatically. The conventional liquid based RP system used a special designed recoat to scrape resin from one side of the tank to the other to ensure the surface flatness. The scraping procedure will take off extra resin but with a drawback of shear force to the working part. In order to overcome the drawback of the shear force, a supporting structure is necessary to build under the working part. In this research, scrapples spray coating technology has been applied to replace the role of recoator. By the knowledge of no scraping, there is no shear force during layer additive process. Therefore, only a limited supporting structure is required to hold the working part. This paper introduces an innovative Micro-RP system. This system integrates spray coating technology to add a very thin layer of resin to the resin tank, and applies dynamic mask device to exposure fine definition of the cross section shapes on the resin surface. The spray coating device proposed in this system can achieve up to 0.5 um display resolution which gives a very fine layer thickness control. The dynamic mask lithography technology based Micro RP system to cure layers with both equitable size and fine features. At the end, the lab-build Micro-RP system could meet the market demand for the very small components. The results demonstrate the ability to add a new layer of resin as thin as 5μm. It also shows the potential to form fine features with a restricted supporting structure. This aspect is particularly important when Micro-RP system is used to fabricate small series of micromechanical parts. When using the spray coating technology to produce overhand prototypes, there is no need to hold the part to against resin moving force from the recoating or the Deep Dip process. The results demonstrate a 4mm wide overhang structure bridge build up by more than 500 layers. The results also demonstrate a set of 3D turbines in 0.5mm diameter each gives very fine structures.