Study on Path Generation and Control based on Dual Laser in Solid Freefrom Fabrication System

Solid freeform fabrication system (SFFS), which is one of rapid prototyping (RP) systems, has been widely used to fabricate 3D solid part by sintering powder and stacking the fabricated layer. To fabricate a part, a laser scan path as machining path is needed. The laser scan path has to be generated in consideration of fast and precise scan. In case of fabricating larger size parts, the unique scan device and scan path generation should be considered. In this paper, the development of SFFS machines being capable of large size fabrication, which is about 500times1000times800 mm (WtimesDtimesH) will be addressed. The dual laser system and the unique scan device have been designed and built, which employ CO₂ lasers and dynamic 3-axis scanners. The developed system allows scanning a larger planar surface with the desired laser spot size. Also, to generate a dual laser scan path, a single laser scan path has to be divided into two parts with respect to the center of each layer. To evaluate the suggested method, the specimen will be fabricated