TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Main Aspects Regarding the Screw-on Torque Diminishing when Using the Fine Pitch Screw
(Aspecte privind diminuarea momentelor de înşurubare a elementelor filetate standardizate echipate cu filet cu pas fin)
Vol LXIV • No. 2/2012
Adrian Creiţaru
Universitatea Petrol-Gaze din Ploieşti, Bd. Bucureşti 39, Ploieşti
e-mail: adrian_creitaru@yahoo.com

 Keywords   screw-on torque, thread characteristics, thread friction, pitch.

 Abstract
Romanian special standards - according to international (ISO) ones - show metric threads of common use for this kind of screw elements (bolts, nuts); there are a lot of standardized and un-standardized variants and also for any mechanical threaded pieces. In usual practice, the threads are executed with normal (standard) pitch. Other cases, when fine pitch in choose, there are some functional behaviour, besides all the dimensional particularities. All these cases, the screw-on torque are significantly diminished given the situation of standard pitch use.
The paper delivers here a theoretical analyze of functional thread characteristics and also brings some other lucrative results for mechanical design practice.

 Rezumat
Standardele româneşti de specialitate - în acord cu cele internaţionale (ISO) - tratează filetele metrice de uz general, care sunt folosite în execuţia organelor de maşini tip (şuruburi, piuliţe), în variantele standardizate sau nestandardizate şi a filetelor diverselor piese mecanice.
Filetele folositeîn practică sunt executate, cel mai frecvent, în varianta cu pas normal. Variantele de filete cu pas fin au însă, dincolo de particularitatea dimensională, o comportare diferenţiată în exploatare. Momentele de înşurubare aplicate pentru asamblarea acestora sunt, în cazul filetelor cu pas fin, diminuate faţă de cele cu pas normal. Articolul face deci o analiză teoretică a acestor particularităţi funcţionale ale filetelor, aducând apoi o serie de rezultate practice privind calculul momentelor de înşurubare.



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