Parameterization and optimization strategies for the automated design of uPVC profile extrusion dies

Ettinger, H.J.; Sienz, Johann; Pittman, J. F. T.; Polynkin, A.

doi:10.1007/s00158-004-0440-x

Cited by 32 publications

(32 citation statements)

References 8 publications

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“…The first zone represents the entry of the die and the manifold. The other zones (2,3,4) represent the zones of low thickness of the die (land), which are respectively: the triangle, the relaxation zone, and the lips, as Fig. 1 indicates.…”

Section: Mesh Size Sensitivementioning

confidence: 99%

“…The majority of the early works on the extrusion process use the geometrical parameters to optimise the velocity distribution at the die exit [1][2][3][4]. The channel geometry of a flat die should be optimized such that a uniform velocity distribution at the die exit is obtained without excessively increasing the pressure drop across the die.…”

Section: Introductionmentioning

confidence: 99%

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Application of a response surface method to the optimal design of the wall temperature profiles in extrusion die

2009

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A new approach to the optimal design of the die wall temperature profile in polymer extrusion processes is presented. In this approach, optimization of the design variables is conducted by a Response Surface Method (RSM) and the Sequential Quadratic Programming (SQP) algorithm. Design of experiment (DoE) needed for the construction of the response surface is used to evaluate the objective and the constraint functions on the basis of a finite element method (FEM). Two designs of experiments are used and the performances of the optimization results are compared with respect to efficiency and ability to obtain a global optimum. Typically, for extrusion die design, the objective function states that the average velocity across the die exit is uniform. Constraints are used to limit the pressure drop in the die. For this purpose, we optimize the wall temperature profile of a coat hanger die in a heterogeneous way, (i.e. the wall temperature may not be constant in the entire die). The melt temperature enables us to locally control the viscosity, which influences the flows in the various zones. The effect of the design variables in the objective and constraint functions is investigated using Taguchi method. The flow analysis results are then combined with an automatic optimization algorithm to provide a new profile of the die wall temperature distributions.

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Section: Mesh Size Sensitivementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of a response surface method to the optimal design of the wall temperature profiles in extrusion die

2009

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“…The second option for geometry representation is the use of a parameterization. The ways in which parameterization can be applied are manifold, ranging from very simple approaches-such as the variation of flow channel height and length [3][4][5][6][7]9,14]-to more elaborate approaches where free-form surfaces are represented using splines [2]. Advantageous about parameterization techniques is the reduction to very few design parameters, which afford more freedom in the choice of the optimization algorithm.…”

Section: Introductionmentioning

confidence: 99%

“…Differences lie in the details. For example, either the average velocity or the flux can be used in the least-squares term, and the evaluation of the term can be done in different ways: it can be aggregated over the nodes, the cells or small segments that the outflow cross section is subdivided into [1][2][3][4][5]. In addition to this primary criterion, some groups examined secondary criteria such as pressure loss or dwell periods [3,[6][7][8][9]].…”

Section: Introductionmentioning

confidence: 99%

Numerical shape optimization as an approach to extrusion die design

Elgeti

Probst

Windeck

et al. 2012

Finite Elements in Analysis and Design

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“…The above mentioned problems motivated the development of the automatic die design concept [5][6][7][8][9]. The main objective of this approach is to transfer the design process control to the computer, in order to enable the automatic search (i.e., without any user intervention) of the optimal tool geometry required for the production of a specific profile.…”

Section: Introductionmentioning

confidence: 99%

Profile Extrusion Dies: The Effect of Machining Inaccuracies on Flow Balance and Its Dependence on the Design Strategy Used

Nóbrega¹,

Pereira²,

Carneiro³

2009

AIP Conference Proceedings

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Investigations on the temperature dependence of the die entrance flow of various long-chain branched polyethylenes using laser-Doppler velocimetry Abstract. The achievement of an even flow distribution is one of the main tasks of the profile die design procedure. For this purpose there are two different alternative strategies, namely those that involve or not modifications of the die land cross section. As shown in previous works [1], those alternative strategies show different sensitivities to variations of the process parameters and material rheology, leading to the production of profiles with different tendency to distort in use. Additionally, it is well-known that some of the problems faced during the production of a new profile arise in the manufacturing stage of the die flow channel and are related with inaccuracies associated to the machining equipment used. These inaccuracies affect the final flow channel geometry and are unavoidable, but are not taken into account during the design stage. In this work an in-house 3D numerical modeling code based on the finite volume method is used to study the effect of slight dimensional variations (similar to those arising in the machining stage) on the performance of extrusion dies designed with the above referred strategies.

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Parameterization and optimization strategies for the automated design of uPVC profile extrusion dies

Cited by 32 publications

References 8 publications

Application of a response surface method to the optimal design of the wall temperature profiles in extrusion die

Application of a response surface method to the optimal design of the wall temperature profiles in extrusion die

Numerical shape optimization as an approach to extrusion die design

Profile Extrusion Dies: The Effect of Machining Inaccuracies on Flow Balance and Its Dependence on the Design Strategy Used

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