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CASTING WITH SKEWED EJECTION DIRECTION

Title
CASTING WITH SKEWED EJECTION DIRECTION
Authors
Ahn, HKCheng, SWCheong, O
POSTECH Authors
Ahn, HK
Date Issued
Dec-1998
Publisher
SPRINGER-VERLAG BERLIN
Abstract
Casting is a manufacturing process in which liquid is poured into a cast (mould) that has a cavity with the shape of the object to be manufactured. The liquid then hardens, after which the cast is removed. We address geometric problems concerning the removal of the cast. A cast consists of two parts, one of which retracts in a given direction carrying the object with it. Afterwards, the object will be ejected from the retracted cast part. In this paper, we give necessary and sufficient conditions to test the feasibility of the cast part retraction and object ejection, where retraction and ejection directions need not be the same. For polyhedral objects, we show that the test can be performed in O(n(3) log n) time and the cast parts can be constructed within the same time bound. We also give a polynomial time algorithm For finding a feasible pair of retraction and ejection directions For a given polyhedral object.
Keywords
DESIGN; MOLD
URI
http://oasis.postech.ac.kr/handle/2014.oak/28525
ISSN
0302-9743
Article Type
Article
Citation
LECTURE NOTES ON COMPUTER SCIENCE, vol. 1533, page. 139 - 148, 1998-12
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 AHN, HEE KAP
Dept of Computer Science & Enginrg
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