This report describes a CAD approach for automated ejectability analysis and parting surface generation for mold tool design. This design automation is incorporated into a Rapid Tool Manufacturing system which integrates stereolithography (SLA) and thermal spraying into a CAD/CAM environment for manufacturing tooling like injection molds. Design models are first evaluated for part ejectability ...

Mold design can be a difficult, time-consuming process. Determining how to split a mold cavity into multiple mold pieces (e.g., core, cavity) manually can be a tedious process. This paper focuses on the mold construction step of the automated mold design process. By investigating glue operations and its relations with parting faces, an approach based on a new reverse glue operation is presented...

A parting line for a convex polyhedron, P, is a closed curve on the surface of P. It deenes the two pieces of P for which mold-halves must be made. An undercut-free parting line is one which does not create recesses or projections in P and thus allows easy de-molding of P. Computing an undercut-free parting line that is as at as possible is an important problem in mold design. In this paper, an...

Middle to Upper Triassic (Upper Ladinian to Lower Carnian) deep-sea sedimentary rocks crop out across a large area west of Nakhlak village, Central Iran and have been named Ashin Formation. The up to 304m thick, turbiditic, siliciclastic Ashin Formation consists of alternating turbiditic, thin- and medium-bedded calcareous sandstones, purple, fine-grained volcaniclastic sandstones, and mostly g...

It has been said that there is no stronger urge than the urge to edit someone else's writing. Upon my retirement from the National Institute of Environmental Health Sciences (NIEHS), and concurrently from my position as co-editor-in-chief of Environmental Health Perspectives, I find that perhaps the stronger urge is not to edit but rather to editorialize. Therefore, I would like to provide some...

Title of Thesis: ROCK FABRIC ANALYSIS OF THE SIERRA CREST SHEAR ZONE SYSTEM, CALIFORNIA: IMPLICATIONS FOR CRUSTAL-SCALE TRANSPRESSIONAL SHEAR ZONES Callan Bentley, Master of Science, 2004 Thesis Directed By: Dazhi Jiang, Assistant Professor, Geology Department Crustal-scale tabular shear zones are common features of transpressional orogens and arcs. Though foliation development in shear zones i...