FLUIDODINAMICA: O comportamento de um fluido não newtoniano em uma ferramenta de extrusão

Abstract

In an extrusion company most responsible for the scrap generated during the process is the imbalance of the flow of an extrusion tool called extrusion die. This causes incorrect balancing losses of raw materials and machinery parades hours where this loss has a direct impact on revenues of a company. Nowadays these losses process is responsible for about 6% of the monthly revenue of a company. In order to reduce these losses companies are increasingly seeking for ideal cases, where it combines the low vs high productivity scrap, which is why more and more companies are investing in technology and processes that can help the designer to define the best concept of the tooling. Whereas today the process of developing an extrusion tool is basically the practice in the grounds of the designer and his assertiveness is a result of "trial and error". This work aims to study the balance of a non-Newtonian fluid in an extrusion tool, and thereby identify the key variables that influence the imbalance flow extrusion and thus can control and eliminate these variables. To this end analyze a mathematical model of an extrusion tool for extruding a profile of square section in this case will use a specific compound called elastomers classified as EPDM which is commercially known as synthetic rubber, as a reference theoretical be used as the basis of analysis model Fluid "Herschel-Bulkley" and we can see the physic-chemical phenomena that occur during the extrusion process to validate this information will be used a flow simulation software. Based on these data and practical results will be made possible to control the process variables and decrease by about 30% the scrap generated in process.