Using concavity index for manufacturing feature recognition

Janusz Pobożniak


The paper presents the usage of the concavity index for the effective recognition of the concave, open manufacturing features like open pockets, through slots and steps. The determination of this index using B-Rep representation is presented in detail. This is a fragment of an algorithm for the recognition of manufacturing features defined in the STEP-NC standard.

Słowa kluczowe: manufacturing feature recognition, STEP-NC, CAD/CAM integration

[1] Babic B., Nesic N., Miljkovic Z., A review of automated feature recognition with rulebased pattern recognition, Computers in Industry, Volume 59, Issue 4, 2008.

[2] ISO 10303-1:1994 Industrial automation systems and integration – Product data representation and exchange – Part 1: Overview and fundamental principles.

[3] ISO 10303-21:2002, Industrial automation systems and integration – Product data representation and exchange – Part 21: Implementation methods: Clear text encoding of the exchange structure.

[4] Joshi S., Chang T.C., Graph based heuristics for recognition of machined features from 3D solid model, Computer Aided Design 20 (2), 1998.

[5] Mokhtar A., Xu X., Lazcanotegui I., Dealing with feature interactions for prismatic parts in STEP-NC, Journal of Intelligent Manufacturing, 04/2012.

[6] Pobożniak J., Algorithm for ISO 14649 (STEP-NC) feature recognition, Management and Production Engineering Review, Vol. 4, No. 4, December 2013.

[7] Pobożniak J., Automation of CNC Machine Tool Programming Using STEP-NC (ISO 14649), Applied Mechanics and Materials Vol. 656, 2014.

[8] Pobożniak J., The approach for the recognition of interacting manufacturing features, The Ninth International Conference on Engineering Computational Technology, 2–5 September, Naples, Italy, 2014.

[9] Vandenbrande J.H., Requicha Aristides A.G., Spatial reasoning for the automatic recognition of machinable features in solid models, IEEE Pattern Analysis and Machine Intelligence. 01/1993.