Zhang, Guangdong, Huang, Xiang, Li, Shuanggao and Deng, Tong ORCID: https://orcid.org/0000-0003-4117-4317 (2019) Optimized design method for profile extrusion die based on NURBS modeling. Fibers and Polymers, 20 (8). pp. 1733-1741. ISSN 1229-9197 (Print), 1875-0052 (Online) (doi:10.1007/s12221-019-1168-y)

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Abstract

For optimization design of polymer extrusion dies, dimensional accuracy is critical to product quality of the extrudate. The extrusion dies used to be a regular geometrical profile, which is mostly composed by a straight line. Traditional optimization methods for extrusion die design used to have poor controllability when dealing with a curved profile. In this paper, the response surface optimization method is used to find out an optimal solution of the design of the extrusion die. Firstly, the Latin Hypercube Sampling method is used to generate the experiment samples for the design of experiments. Secondly, ANSYS Polyflow software is adopted to execute the computational fluid dynamics analysis. Thirdly, the Kriging method is used to generate the response surface. Finally, nonlinear programming by using Quadratic-Lagrangian algorithm is applied to find out the optimal solution. It is worth noting that Non-uniform Rational B-Splines (NURBS) modeling is used to optimize flow channel of an extrusion die in order to obtain a qualified extrudate. Thus, design variables for the optimization involve control points of the NURBS curve of the inlet cross-section. Meanwhile, two new objective functions, including minimization of point displacement and minimization of dimensional tolerance are proposed in the optimization process. Compared with existing objective functions of flow balancing and homogeneous die swell, the new objective functions of minimization of point displacement and minimization of dimensional tolerance have significant advantages of strong adaptability, more precise shape of the extrudate and fast convergence, which significantly improve efficiency of the optimization design and thus lower manufacturing costs of the extrusion die.

Item Type:	Article
Uncontrolled Keywords:	polymer extrusion die, optimized design method, dimensional tolerance, NURBS, response surface methodology
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Wolfson Centre for Bulk Solids Handling Technology Faculty of Engineering & Science > School of Engineering (ENG)
Last Modified:	18 Sep 2020 23:35
URI:	http://gala.gre.ac.uk/id/eprint/25079

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