Parting Thoughts

Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology. Parting thoughts.

Decision criteria for computer-aided surface design parting

A scientific approach is presented and the related logic developed for design of parting surfaces of patterns, moulds and dies used in the manufacture ot cast, forged, injection-moulded and die-cast components. This has enabled computer-aided generation of parting surfaces and the determination of projected area, flatness and draw for a parting surface, identification of surfaces to which draft...

Determining Moldability and Parting Directions for Polygons with Curved Edges

We consider the problem of whether a given geometry can be molded in a two part, rigid, reusable mold with opposite removal directions. We describe an efficient algorithm for solving the opposite direction moldability problem for a 2D “polygon” bounded by edges that may be either straight or curved. We introduce a structure, the normal graph of the polygon, that represents the range of normals ...

Computing a Flattest, Undercut-Free Parting Line for a Convex Polyhedron, with Application to Mold Design

A parting line for a polyhedron is a closed curve on its surface, which identiies the two halves of the polyhedron for which mold-boxes must be made. A parting line is undercut-free if the two halves that it generates do not contain facets that obstruct the de-molding of the polyhedron. Computing an undercut-free parting line that is as \\at" as possible is an important problem in mold design. ...

Automatic generation of mold-piece regions and parting curves for complex CAD models in multi-piece mold design

Multi-piece molding technology is an important tool in producing complex-shaped parts that cannot be made by traditional two-piece molds. However, designing multi-piece molds is also a time-consuming task. This paper proposes an approach for automatic recognition ofmold-piece regions and parting curves for free-form CAD models. Based on the geometric properties of objects and mathematical condi...