On Systematic CAD/CAM Modeling of Blow Molds for Plastic Bottles

Abstract:

A systematic and detailed approach in design and manufacturing of blow molds for bottles made of PET and PP plastic material with CAD/CAM software tools is presented, as many production errors and product deficiencies stem from inaccurate and imprecise tooling. Apart from high mold accuracy, proper planning also includes the minimization of mold machining costs, which mainly derives from CNC machining time and cutting tool wear. Blow mold design and manufacturing revolves around two major axes: (a) mold material and (b) machining parameter values. The former is critical in terms of production rates and mold life-cycle and the latter has a great impact on mold manufacturing cost, as well as on quality of the produced plastic bottles. Proper choice of machining parameters has a significant impact on thermal conductivity, durability, hardness, stiffness and roughness of the mold. The proposed methodology was implemented on three different test cases (beverage plastic bottles molds) and it was concluded that even the same machining parameter values offer the same mold quality.

• Periodical: Solid State Phenomena (Volume 261)
• Pages: 448-455
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.261.448
• Online since: August 2017
• Authors: Agathoklis A. Krimpenis*, John G. Tsakanikas
• Keywords: Blow Molding, CAD, CAM, CNC Milling, PET

References

[1] O. Brandau, PDL Handbook Series Stretch. Blow Molding (2nd ed. ), Elsevier, (2012).

[2] M. Bordival, F.M. Schmidt, Y. Le Maoult, V. Velay, Optimization of preform temperature distribution for the stretch-blow molding of PET bottles: Infrared heating and blowing modeling. Polymer Engineering & Science, 1 (2008) 1023-1026.

DOI: 10.1002/pen.21296

[3] C.A.S. Miranda, J.J.D. Câmara, O.P. Monken and G.C. Dos Santos, Design Optimization and Weight Reduction of 500 mL CSD PET Bottle through FEM Simulations. Journal of Materials Science and Engineering, 1 (2011) 947-959.

[4] J.A.W.M. Groot, C.G. Giannopapa, R.M.M. Mattheij, CASA-Report 11-27: Modelling stretch blow moulding of polymer containers using level set methods. University of Eidhoven (2011, April). Retrieved from http: /www. win. tue. nl/ analysis/reports/rana11-27. pdf.

[5] B. Cosson, L. Chevalier, G. Régnier, Simulation of the stretch blow moulding process: from the modelling of the microstructure evolution to the end-use elastic properties of polyethylene terephthalate bottles. International Journal of Material Forming, Springer, 5(1) (2012).

DOI: 10.1007/s12289-010-1010-y

[6] E. Deloye, J. -M. Haudin, N. Billon, Influence of chemical architecture of PET on ability to stretch blow moulding. International Journal of Material Forming 1(1 Supplement) (2008) 715-718.

DOI: 10.1007/s12289-008-0315-6

[7] J. Zimmer, M. Stommel, Method for the evaluation of stretch blow molding simulations with free blow trials. IOP Conf. Series: Materials Science and Engineering, IOP Publishing, 48 (2013) 1-10.

DOI: 10.1088/1757-899x/48/1/012004

[8] J.A.W.M. Groot, R.M.M. Mattheij, C.G. Giannopapa, Modeling Preform and Mold Shapes in Blow Molding. Progress in Industrial Mathematics at ECMI 2010, Mathematics in Industry Springer, (2012) 319-326.

DOI: 10.1007/978-3-642-25100-9_37

[9] K.M. Au, K.M. Yu, Conformal cooling channel design and CAE simulation for rapid blow mold. The International Journal of Advanced Manufacturing Technology, Springer, 66(1-4) (2013) 311-324.

DOI: 10.1007/s00170-012-4326-6

[10] V.V. Stulov, Simulation of heat transfer on cooling molds. Journal of Machinery Manufacture and Reliability, Springer, 40(4) (2011) 366-371.

DOI: 10.3103/s1052618811030150

[11] J.C. Lin, C.C. Tai, Accuracy Optimization for Mold Surface Profile Milling. The International Journal of Advanced Manufacturing Technology, Springer, 15(1) (1999) 15-25.

DOI: 10.1007/s001700050034

[12] W.M. Chan, L. Yan, W. Xiang, B.T. Cheok, A 3D CAD knowledge-based assisted injection mold design system. The International Journal of Advanced Manufacturing Technology, Springer, 22(5-6) (2003) 387-395.

DOI: 10.1007/s00170-002-1514-9

[13] K.S. Chin, C.K. Mok, X. Zu, Modeling and performance simulation of mold-design process. The International Journal of Advanced Manufacturing Technology, Springer, 34(3-4) (2007) 236-251.

[14] K. GiridharReddy, K. Rajagopal, Blow Mould Tool Design and Manufacturing Process for 1litre Pet Bottle. IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE), 8(1) (2013) 12-21.

DOI: 10.9790/1684-0811221

[15] A. Fiorentino, Cost drivers-based method for machining and assembly cost estimations in mold manufacturing. The International Journal of Advanced Manufacturing Technology, Springer, 70(5-8) (2013) 1437-1444.

DOI: 10.1007/s00170-013-5419-6

[16] B. Denkena, J.T. Schürmeyer, R. Kaddour, V. Böß, Assessing mold costs analysing manufacturing processes of cavities. The International Journal of Advanced Manufacturing Technology, Springer, 56(9-12) (2011) 943-949.

DOI: 10.1007/s00170-011-3265-y

[17] Z. Bouaziz, J.B. Younes, A. Zghal, A Fast and Reliable Tool for Estimates for Plastic Blowing Molds. The International Journal of Advanced Manufacturing Technology, Springer, 20(7) (2002) 545-550.

DOI: 10.1007/s001700200188