| Summary: | 碩士 === 國立臺北科技大學 === 製造科技研究所 === 94 === This research focuses on the improvement of micro rapid prototyping (RP) system by using spray coating technology. Together with the development of the rapid prototype technology, it gives the ability to produce parts with fine features.
Many researches are now focusing on building parts with even micro features. Conventional approach to add layer of resin to the surface in the liquid based RP systems is mostly using recoater. When the layer thickness becomes thinner, it will increase the smear force to the working part. For micro-RP systems, the layer thickness is between 5μm to 50μm in which the commercial high definition RP system (like SLA Viper Si2) is between 50μm to 100μm. The smear force will wipe and tear down the working part. Furthermore, when the feature size is small, the fine features of the part are connected by the supporting structure. It will be very difficult to remove the structure without break the feature. The proposed spray coating technology could add a very thin layer of resin with no smear force and there is almost no need to build up supporting structures.
Many spraying techniques have been tested in this study. The results show that rising the temperature of the resin can decrease the consistency and the pressure will help the flow. A special designed spray coating system which provide 32kg/cm2 pressure and 42℃ nozzle out temperature can add 28μm thickness of layer with three pulse of spraying. The benchmark testing also show the possibility of a 3D fabrication in which a overhang structure of the part can be build with almost no over curing.
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