О МОДЕЛИРОВАНИИ ПРОЦЕССА ТЕЧЕНИЯ РЕЗИНОВЫХ СМЕСЕЙ В КАНАЛАХ СОЭКСТРУЗИОННОЙ ГОЛОВКИ С УСИЛЕННОЙ ЗОНОЙ КОНТАКТА МАТЕРИАЛОВ

Abstract

Currently, in the chemical and related industries, the process of obtaining polymeric, two-layer products with a reinforced contact zone of materials is common. These products include: caterpillar tracks, liners for tram tracks, etc. Particular attention is paid to the quality of products obtained by coextrusion. The article presents ways to solve problems of obtaining a strong connection between the layers of materials and an unstable shape of the extrudate at the outlet of the co-extrusion head. The authors propose to use a co-extrusion head with a reinforced material contact zone. In order to save time and computing resources, it is necessary to identify a rational design zone, in which sufficient calculation accuracy will be ensured. To identify the rational design zone, numerical experiments were carried out in the ANSYS software and computer system. The Maxwell model was chosen as the rheological model. Velocity and pressure distribution patterns were obtained, which can be used to solve various applied problems. It was revealed that the maximum speed is achieved in the center of the head section, while its minimum values are located along the periphery. As a result, dependences of the velocity inhomogeneity coefficient in the outlet section on the relative tooth height were drawn. The resulting regression curves are similar for the cases of the full and partial simulation zones. That is why it is sufficient to simulate the process only in the part of the extrusion head. With such a scheme, the number of finite elements will be less, which, with a given accuracy, will reduce the calculation time. The results obtained can be used in the design of co-extrusion heads for tire and rubber industries in order to replace foreign equipment with domestic developments.