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Type of publication: Straipsnis mokslo-populiarinimo leidinyje / Article in popular science editions (S6)
Field of Science: Mechanikos inžinerija / Mechanical Engineering (T009)
Author(s): Balčiūnas, Donatas;Pocius, Antanas
Title: Sriegio M6 geometrinių parametrų pokyčio priklausomybė nuo užveržimo momento
Other Title: Dependence of geometrical parameters change of M6 thread on T torque
Is part of: Agroinžinerija ir energetika : ASU Žemės ūkio inžinerijos fakulteto mokslo populiarinimo ir gamybos žurnalas. , 2015, Nr. 20
Extent: p. 150–156
Date: 2015
Keywords: Bolts M6x100;Torque;Thread profile angle;Thread pitch
Abstract: While operating various constructions and machines, the increase in loosening of threaded joints was observed. In the process of framing parts, when the torque is controlled, the bolts come loose after 200 hours of engine running. Thus, connections become inefficient, the stress decreases in one place and increases in another and this results in breakdowns. The paper investigates the dependence of M6x100 thread geometrical parameters of 8.8 grade bolts on the torque. The obtained data suggests that the torque influences thread geometrical parameters. When there is a friction in the M6x10 thread of 8.8 grade bolts, thread profile angle α increases from 0,1…2,1 % and thread pitch P increases from 0,26 to 34 µm. When there is a friction in the thread and bearing surface of a nut, thread profile angle increases from 0,1…1,7 % and thread pitch in-creases from 0,25 to 31 µm. A combined method should be used for bolt tightening when both torque and elongation of a bolt are controlled
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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