Numerical Optimization of Shrinkage and Warpage on the Injection Molding Process Parameters of Electrical Connector

Abstract:

Integrated with orthogonal design method and numerical simulation, injection molding process of the Y-type electrical connectors was conducted to study the influence of process parameters on volume shrinkage rate and maximum warpage, which are regarded as product quality indices. The multi-indices valuation model for the main influencing factors of the process is developed. The influencing sensitivity to the multi-objective of the processing parameters, such as melt temperature, mold temperature, injection time and holding pressure, is determined by range analysis. Through analyzing the diagrams of influential factors, the optimized process parameter diagram is obtained and verified by simulation. The optimum parameters minimizing the warpage defect and shrinkage are: melt temperature (528K), mold temperature (338K), filling time (0.6s), holding pressure (100%) and holding time (10s). The results show that it is effective to balance the impact of process parameters on the shrinkage and warpage. The work can provide optimal design and process reference for the quality control and assembly precision.

• Periodical: Applied Mechanics and Materials (Volume 868)
• Pages: 183-191
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.868.183
• Online since: July 2017
• Authors: Yun Wang*, Li Yu Chen, Xia Ming Yang, Yan Zhao, Zhen Ying Xu, Xue Peng Wang
• Keywords: Connector, Injection Molding, Multi-Objective Optimization, Orthogonal Experiment

References

[1] C. Chen, Simulation and Experimental Study in Determining Injection Molding Process Parameters for Thin-shell Plastic Parts via Design of Experiments Analysis, Expert Systems with Applications, Vol. 36, No. 7, pp.10752-10759, (2009).

DOI: 10.1016/j.eswa.2009.02.017

[2] R. Hussin, R.M. Saad, R. Hussin, M.S.I.M. Dawi. An Optimization of Plastic Injection Molding Parameters Using Taguchi Optimization Method, Asian Transactions on Engineering, Vol. 2, No. 5, pp.75-80, (2012).

[3] M. Altan, Reducing Shrinkage in Injection Moldings via the Taguchi, ANOVA and Neural Network Methods, Materials & Design, Vol. 31, No. 1, pp.599-604, (2010).

DOI: 10.1016/j.matdes.2009.06.049

[4] H. Öktem. Optimum Process Conditions on Shrinkage of an Injected-molded Part of DVD-ROM Cover Using Taguchi Robust Method, International Journal of Advanced Manufacturing Technology, Vol. 61, No. 5-8, pp.519-528, (2012).

DOI: 10.1007/s00170-011-3750-3

[5] C.A. Harper, Modern Plastics Handbook. McGraw-Hill. (1941).

[6] D.D. Rosato Ph, E.D. Rosato P, Injection Molding, in Plastics Processing Data Handbook, (1990).

DOI: 10.1007/978-94-010-9658-4_2

[7] C. J. Hwang, T. H. Kwon. A full 3D Finite Element Analysis of the Powder Injection Molding Filling Process Including Slip Phenomena, Polymer Engineering & Science, Vol. 42, No. 1, pp.33-50, (2002).

DOI: 10.1002/pen.10926

[8] S.W. Kim, L.S. Turng, Three-dimensional Numerical Simulation of Injection Molding Filling of Optical Lens and Multiscale Geometry Using Finite Element Method, Polymer Engineering & Science, Vol. 46, No. 9, pp.1263-1274, (2006).

DOI: 10.1002/pen.20585

[9] H.H. Chiang, C.A. Hieber, K.K. Wang, A Unified Simulation of the Filling and Post-filling Stages in Injection Molding Part I: Formulation, Polymer Engineering and Science, Vol. 31, No. 2, pp.116-124, (1991).

DOI: 10.1002/pen.760310210

[10] J. Shoemaker, Moldflow Design Guide: A Resource for Plastics Engineers, Hanser, (2006).

DOI: 10.3139/9783446418547.fm

[11] L.J. Guo, J.J. Gao, J.F. Yang, J.X. Kang, Criticality evaluation of petrochemical equipment based on fuzzy comprehensive evaluation and a BP neural network, Journal of Loss Prevention in the Process Industries, Vol. 22, No. 4, pp.469-476, (2009).

DOI: 10.1016/j.jlp.2009.03.003

[12] I.L. Sandu, C. Fetecau, Effects of Injection Process Parameters on the Warpage of Thin-walled Plastic Parts, Materiale Plastice, Vol. 48, No. 4, pp.315-321, (2011).

[13] M. Kurt, Y. Kaynak, O.S. Kamber, B. Mutlu, B. Bakir, U. Koklu, Influence of Molding Conditions on the Shrinkage and Roundness of Injection Molded Parts, International Journal of Advanced Manufacturing Technology, Vol. 46, No. 5-8, pp.571-578, (2010).

DOI: 10.1007/s00170-009-2149-x