Modeling of Process of CO-Extrusion of Rubber Mixtures in the Channels of Cable Dies
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MODELING OF PROCESS OF CO-EXTRUSION OF RUBBER MIXTURES IN THE CHANNELS OF CABLE DIES P. P. Yurygin,1 I. S. Gudanov,2 Yu. B. Lavrent’ev,2 D. S. Dolgin,2 A. E. Lebedev,2 and A. B. Kapranova2
UDC 621.929.3
Results of computer modeling of the process of co-extrusion of two-layer ring profile insulation in extrusion dies by the finite-element method are presented. Design features of the 3D models are specified. Recommendations for obtaining high-quality products are presented. Key words: extrusion, co-extrusion, extrusion die, multi-layer product, velocity field.
Co-extrusion processes are used in many different branches of industry in order to efficiently produce multilayer products with different properties and different thicknesses of the layers. Despite the numerous advantages, however, the use of the method of co-extrusion is limited due to the absence of methods of calculation and modeling. In the present article we provide results of a simulation of the co-extrusion process applied to rubber mixtures in the production of multi-layer insulating coatings. Numerical simulation of the processes that occur in extrusion dies in the course of producing multi-layer ring profile insulation is performed with the use of modern software and hardware complexes that implement the finite-element method. Industrial extrusion dies for the production of multi-layer insulation are distinguished by complex and often asymmetric designs, which substantially complicates the simulation problem. A system of spiral feeder channels is provided in the die under investigation (Fig. 1) [1, 2], making it possible to realize uniform distribution of the hydrodynamic parameters of the flow of polymers before their delivery to the stratification region. In view of the complex nature of the construction of dies for use in co-extrusion, the process of quantization of the design region, which exerts a substantial influence on the precision of the calculations, is especially important in simulation. The density of the lattice in the direction of the output section of the die as well as in zones with marked variation of geometry is increased when creating a finite-element lattice of the design region of the die (Fig. 2). In numerical simulation of the process of co-extrusion the velocity and pressure fields are investigated based on the position of the interface between the materials (rubber mixtures) and the position of the free surface of the extrudate. The following values of the parameters are adopted in the calculations: radius of cable conductor rcab = 0.006 m; thickness of internal layer of insulation (material A) and of outer layer of insulation (material B) hA = hB = 0.004 m; 1 2
Friteks AO, Yaroslavl, Russia; e-mail: [email protected].
Yaroslavl State Technical University, Russia; e-mail: [email protected].
Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, Vol. 56, No. 6, pp. 47−48, June, 2020. 504
0009-2355/20/0506–0504
© 2020
Springer Science+Business Media, LLC
MODELING OF PROCESS OF CO-EXTRUSION OF RUBBER MIXTURES IN THE
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