Eventos Anais de eventos
COBEF 2017
Congresso Brasileiro de Engenharia de Fabricação
Super-bolt and Screw Fixation: An Optimized Methodology Based on Tribological Fundamentals
Submission Author:
Felipe Celso Linhares Ferreira , MG
Co-Authors:
David Jonhson Barcelos, Antônio Pertence, Marcelo Câmara
Presenter: Felipe Celso Linhares Ferreira
doi://10.26678/ABCM.COBEF2017.COF2017-0270
Abstract
The aim of this study is to identify the best way to apply torque on a screw to have the lower loss of power to the system, looking for to increase the efficiency use of the super-bolt and decreasing the possibility of a catastrophic failure in this form of fixation. Given the large applications of gaskets and clamping devices found in industry, especially screwed surfaces, is necessary the study and the understanding of the applied tightening conditions influences and the actual grip generated on the screw threads, as well as inadequate pre loads conditions, which is the main cause of the loosening bolted joints. Issues about inadequate pre loads are associated with the clamping method used, including the friction conditions between materials in the thread. For both tests were performed tribological study contact between the surfaces of AISI 4140 (super-bolt) and AISI 4140 (screw) in a real application by super-bolt fixation, considering different situations. Moreover, mathematical calculations for checking the tension torque x balanced strength in thread and the screw head are performed. Thus, the results show that there is wide variation between the application load and the final outcome of torque, making it possible to identify the best grip method and surface characteristics for the use of super-bolt.
Keywords
Super-bolt, Tribology, Screw, Torque, AISI 4140
