Molds for meshes: computing smooth parting lines and undercut removal

Li, Weishi, Martin, Ralph Robert and Langbein, Frank Curd ORCID: https://orcid.org/0000-0002-3379-0323 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:	17 Oct 2022 09:42
URI:	https://orca.cardiff.ac.uk/id/eprint/5273

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