| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 87 === This research attempts to employ a 3D CAD/CAM system to assist variant design and rapid machining of PC cooling fans. It starts from building the 3D solid model of cooling fans, followed by attaching programs into the model to embed the capability of design variation for various inputs of fan-blade sections. To reach the goal of rapid machining, this research first analyzes the geometric characteristics of fan blades in order to find a proper workpiece orientation for NC machining. Based on the orientation, a two-axis fixture is designed which functions to hold the workpiece as well as to provide two auxiliary rotational axes for the workpiece. Before practical NC machining, process planning is carried out which considers tooling, machining geometry, operations, cutting parameters, and so on. The NC cutter path is generated through the use of Pro/ENGINEER and is verified by machining the workpiece in an NC machining center. In addition, this research also studies the interference between fan blades to automated the generation of parting surfaces for mold-making of cooling fans with multiple fan blades.
The procedure and methods proposed in this research make the possibility of fast design changes for various sizes of cooling fans. The approach to rapid machining also solves the fan-blade interference problem, which significantly reduces the difficulty of NC machining for cooling fans.
|
|---|
