Polyamide worm gear: manufacturing and performance

The focus of this paper is to establish a characterisation method for seven polyamide (PA) grades to determine the major material to manufacture an automotive worm gear. The composite properties were measured according to the worm gear loadings: tensile strength, Young's modulus, abrasion and impact resistance. They were also correlated to the PA moisture absorption and its glass fibre (GF) reinforcement. The data from mechanical tests were applied in the finite element analysis (FEA) using the von Mises stress criterion. Before the rig tests of the PA worm gears, the injection process was evaluated, through the capillary rheometry. A higher difficulty to process PA 6/6 30% GF was found, due to its lower apparent viscosity. In the end, the influence of moisture absorption was as decisive to the gear's material selection as the GF to the pinion. Thus, the PAs with the best performance were: PA 6 with 30% GF (gear) and with PA 60% GF (pinion).

Bibliographic Details

Main Authors:	Gasparin,Alexandre Luís, Corso,Leandro Luís, Tentardini,Eduardo Kirinus, Nunes,Regina Célia Reis, Forte,Maria Madalena de Camargo, Oliveira,Ricardo Vinicius Bof de
Format:	Digital revista
Language:	English
Published:	ABM, ABC, ABPol 2012
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012000300022
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