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Molds for meshes: computing smooth parting lines and undercut removal

Li, Weishi, Martin, Ralph Robert and Langbein, Frank Curd 2009. Molds for meshes: computing smooth parting lines and undercut removal. IEEE Transactions on Automation Science and Engineering 6 (3) , pp. 423-432. 10.1109/TASE.2009.2021324

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Abstract

We consider the problem of computing a parting line for a mold for a complex mesh model, given a parting direction, and the related problem of removing small undercuts, either preexisting, or resulting from the parting line. Existing parting line algorithms are unsuitable for use with complex meshes: the faceted nature of such models leads to a parting line which zig-zags or wanders across the surface undesirably. Our method computes a smooth parting line which runs through a band of triangles whose normals are approximately perpendicular to the parting direction. We generate a skeleton of this triangle band to find its distinct topological cycles, and to decompose it into simple pieces. After selecting paths making a good cycle, we generate a final smooth parting line by iteratively improving the geometry of this cycle. Compliance in the physical material, and/or modifications to eliminate minor undercuts ensure that such a parting line is practically useful.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Computer Science & Informatics
Subjects: Q Science > QA Mathematics > QA76 Computer software
Uncontrolled Keywords: Mesh; mold design; parting line; undercut
Publisher: Institute of Electrical and Electronics Engineers
ISSN: 1545-5955
Last Modified: 18 Oct 2017 12:06
URI: http://orca-mwe.cf.ac.uk/id/eprint/5273

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