Avaliação da quebra das molas poliméricas em engates rápidos de mangueiras de jardim

Abstract

With such a competitive market, reducing the maximum costs for parts with little added value is essential. This project deals with the problem of breaking quick coupling polymer springs for garden hoses in the assembly process. It leveraged research on engineering polymers, cam-follower systems, as examples of curves, types of followers, and how it is dynamically treated. By obtaining the assembly forces and breaking the polymer springs, it was discovered that the break always happened at the end of the course. Through a video analysis, the accelerations present in the current assembler mechanism were identified, and with a new selected curve geometry that had its acceleration peak 25 times lower than the current profile. A dimensional analysis was also done to assess the cause of the whip effect during the assembly of some parts. After all the hypotheses raised that may cause the spring to break, it was suggested the insertion of an elastic element treated as a fusible spring in this work to receive the excess assembly forces, no longer generating the break of the polymer spring. [resumo fornecido pelo autor]