Abstract
In this paper a new methodology of automated demoldability analysis for parts manufactured via plastic injection molding is presented. The proposed algorithm uses as geometric input the faceted surface mesh of the plastic part and the parting direction. Demoldability analysis is based on a sequential model to catalog nodes and facets of the given mesh. First, the demoldability of nodes is analyzed, subsequently, from results of previous nodes analysis, facets of the mesh are cataloged in: demoldable (facets belong cavity and core plate), semi-demoldable (plastic part manufactured by mobile mechanisms, side cores) and non-demoldable (plastic part not manufacturable). This methodology uses a discrete model of plastic part, which provides an additional advantage since the algorithm works independent of the modelling software and creates a new virtual geometry providing information on its manufacture, exactly like CAE software. All elements of the mesh (nodes and facets) are stored in arrays, according with their demoldability category, with information about their manufacture for possible uses in other CAD/CAE applications related to design, machining and costs analysis of injection molds.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Chen L.L., Woo T.C. Computational geometry on the sphere with application to automated machining. ASME Transactions. Journal of Mechanical Design 114, 288-295.
Weinstein M, Manoochehri S. Optimal parting direction of molded and cast parts for manufacturability. Journal of Manufacturing Systems 1997; 16(1):1-12.
Fu M.W, Fuh J.Y.H., Nee A.Y.C. Undercut feature recognition in an injection mould design system. Computer Aided Design 1999; 31(12):777-790.
Fu M.W., Fuh J,Y.H., Nee A.Y.C. Generation of optimal parting direction based on undercut features in injection molded parts. IIE Transactions 1999; 31: 947-55.
Fu M.W, Nee A.Y.C., Fuh J.Y.H. The application of surface visibility and moldability to parting line generation. Computer Aided Design 2002; 34(6): 469-480.
Fu M.W., Nee A.Y.C., Fuh J.Y.H. A core and cavity generation method in injection mold design. International Journal of Production Research 2001; 39:121-38.
Fu M.W., The application of surface demoldability and moldability to side core design in die and mold CAD. Computer Aided Design 2008; 40(5): 567-575.
Yin ZP, Han Ding, You-Lun Xiong: Virtual prototyping of mold design: geometric mouldability analysis for near-net-shape manufactured parts by feature recognition and geometric reasoning. Computer-Aided Design 2001: 33(2): 137-154
Ye X.G. Fuh JYH, Lee K.S.: A hybrid method for recognition of undercut features from molded part. Computer-Aided Design 2001; 33(14):1023-34.
Ye X.G. Fuh JYH, Lee K.S.: Automotive undercut feature recognition for side core design of injection molds. Journal of Mechanical Design 2004; 126:519-26.
Singh R, Madan J, Kumar R. Automated identification of complex undercut features for side core design for die casting parts. Journal of Engineering Manufacture. 2014;228(9):1138-1152.
Nee A.Y.C., Fu, M.W., Fuh J.Y.H., Lee K.S., Zhang Y.F. Determination of optimal parting direction in plastic injection mould design. Annals of the CIRP.1997:,46(1): 429-432.
Nee A.Y.C., Fu M.W., Fuh J.Y.H, Lee K.S., Zhang Y.F. Automatic determination of 3D parting Lines and Surfaces in Plastic Injection Mould Design. Annals of the CIRP. 1998: 47(1): 95-99.
Huang J, Gupta SK, Stoppel K. Generating sacrificial multi-piece molds using accessibility driven spatial partitioning. Computer Aided Design 2003;35(3):1147–60.
Priyadarshi A.K.L., Gupta S.K. Geometric Algorithms for automated design of multipiece permanent molds. Computer Aided Design 2004; 36(3): 241-260.
Rubio M.A.,Pérez J.M., Rios J. A Procedure for plastic parts demoldability analysis Robotics and Computer Integrated Manufacturing 2006; 22(1):81-92.
Martin Doñate C, Rubio Paramio, M. A. New methodology for demoldability analysis based on volume discretization algorithms. Computer Aided Design.2013; 45(2): 229-240.
Martin Doñate C, Rubio Paramio, Mesa Villar A. Método de validación automatizada de la fabricabilidad de diseños de objetos tridimensionales en base a su geometría. Patent number: ES 2512940.
Khardekar R, McMains S. Finding mold removal directions using graphics hardware. In: ACM workshop on general purpose computing on graphics processors; 2004, pp. C-19, (abstract).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2017 Springer International Publishing AG
About this chapter
Cite this chapter
Mercado-Colmenero, J.M., Muriana, J.A.M., Paramio, M.A.R., Martín-Doñate, C. (2017). An automated manufacturing analysis of plastic parts using faceted surfaces. In: Eynard, B., Nigrelli, V., Oliveri, S., Peris-Fajarnes, G., Rizzuti, S. (eds) Advances on Mechanics, Design Engineering and Manufacturing . Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-45781-9_13
Download citation
DOI: https://doi.org/10.1007/978-3-319-45781-9_13
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-45780-2
Online ISBN: 978-3-319-45781-9
eBook Packages: EngineeringEngineering (R0)