Machine Path Generation Using Direct Slicing from Design-by-Feature Solid Model for Rapid Prototyping

摘要

Because of the differences in the rapid prototyping (RP) processes, there is no standard machine pathrncode for them. For each RP process, based on its characteristics and requirements, the required datarnare extracted from the CAD model and converted into proper format for the RP machine. Slicing arnCAD model through intersecting the model with the XY-plane at each Z increment is a well-knownrnmethod of path generation. Slicing a CAD model is currently conducted through Stereolithographyrn(STL) file slicing, direct slicing, and additive direct slicing. In this paper, a direct slicing approachrninside a design-by-feature solid modeler is proposed. Autodesk Inventor solid modeler, as a designby-rnfeature solid modeler is used for 3D solid modeling. The proposed system is implemented byrnVisual Basic codes inside Inventor. In this approach, first protrusion and subtractive features that formrna model are extracted. Then, the intersection of each feature and the XY plane is identified. Then,rninternal and external loops are found. Finally a continuous path in required format is generated.rnDepending on the specific RP process requirements, additional features such as internal or externalrnhatch can be added to the machine path.