Avaliação experimental de uma coroa tipo engrenagem sem-fim fabricada em PA 6

Abstract

This work demonstrates the evaluation of mechanical resistance performed experimentally in a polymeric gear applied in a worm gear speed reducer. The use of a gear made of polymeric material reduces the product cost compared with a metal gear. The evaluation of the polymeric gear in an experimental way serves to verify its functioning in the application of use, thus analyzing the functionality of this change in the final product. This experiment was carried out through tests with controlled torque through the use of a dynamometer. In order to identify any inadequate operating condition or any type of pattern or trend that would indicate the future or iminente failure of the gear, temperature, vibration and mass analyzes were performed at different applied torque values. Through the analysis of temperature, vibration and mass, it was not possible to predict some type of pattern indicating the possible failure of the polymeric gear, but it was possible to identify points where the use of the polymeric gear provides improvements in the final product, as in the reduction the vibratory level of the set and its mass. With the analysis of the obtained data and the use of the linear damage accumulation rule, it was possible to estimate the service life in cycles of the polymer gear according to the torque required at the reducer output. After the analyzes were carried out, it can be concluded that the polymeric gear supported torques higher than the maximum torque indicated for the metallic gear, but showed a considerable reduction in the number of cycles supported in an estimated manner. [resumo fornecido pelo autor]