Abstract
SLS process, which is one of the rapid prototyping (RP), makes it possible that the complex sand cores or sand molds are directly manufactured by 3D CAD data without metallic pattern in a short lead time: In order to fabricare the large and complex castings, the zircon sand suited to this process is developed. In addition, 3D CAD data can be not only made use of SLS process or machining patterns, but cast simulation(CAE).
