Projeto de um molde por injeção de termoplásticos para fabricação de paralamas dianteiro e traseiro de uma bicicleta infantil

Abstract

In the modern world, many objects feature parts that are made of polymeric materials, due to the multifunctionality of this material, the speed of the molding process as well as the fact that they have good impact resistance and have a low production cost. Due to these particularities, thermoplastic injection has become one of the indispensable services in several industrial segments. The polymeric product is inserted in everyday life, in a variety of shapes and functions, from a simple pet bottle cap to complex parts of cars, robots and aircraft. In this context, the realization of this work comes from the request of a local bicycle industry and is to develop the preliminary design of the mold of a front and rear fender pair of a polypropylene thermoplastic children's bicycle. For this, a unique model for the pair of fenders, modeled in CAD software, was selected; later, the injection molding machine and the mold holder were defined; After this selection, a prototype mudguard was printed in 3D and tested on a real kids bike; Then, the power system sizing was performed, as well as CAD / CAE software simulations, from the 3D model. Finally, we performed analysis of the filling mudguard and the feeding system in both cavities of the product. Among the results obtained, it was found that the chosen model met well the informational design of the mold, even though it is necessary to implement the cooling and exhaust gas system.