抄録
Threaded fasteners using bolts is widely applied in industrial field as well as various fields. However, threaded fasteners using bolts have loosening problems and cause many accidents. A nut or the like with a spring washer is used as a countermeasure against loosening of the screw fastening body. However, there remains a problem that an efficient loosening prevention effect can’t be obtained in the case where an increase in the kind of parts and a lock nut can’t be used. In this study, the purpose is to obtain self-loosening preventable threaded fasteners by applying spring characteristic effects on bolt structures. Helical-cutting applied bolt structures is introduced through three dimensional CAD modeling tools. Analytical approaches for evaluations on the spring characteristic effects helical-cutting applied bolt structures and self-loosing preventable performance of threaded fasteners were performed using finite element method and results are reported. Comparing slackness test results with analytical results and more details on evaluating mechanical properties will be executed in future study.
