Vpliv temperature na življenjsko dobo polimernih zobnikov

Potrč Pajk, Gal (author), Kalin, Mitjan (mentor)

Življenjska doba in mehanske lastnosti polimernih materialov so odvisne od mnogih faktorjev. Če govorimo o termoplastih, ki so zaradi enostavnosti predelave najbolj uporabljana skupina tehničnih polimerov (tudi pri zobniški tehniki), moramo izpostavit močno temperaturno odvisnost. Magistrska naloga obravnava vpliv fizikalnih parametrov, zlasti temperature in obremenitve, na življenjsko dobo zobnikov iz polioksimetilena (POM). Za potrebe naloge je bilo razvito posebno preskuševališče, ki omogoča natančne meritve življenjske dobe in izkoristka zobniške dvojice ob konstantni, prednastavljeni temperaturi baze zoba. Na podlagi testne matrike, je bilo testiranih 12 obremenitvenih kombinacij (trije napetostni nivoji in štiri temperature), ki so na koncu zbrane v temperaturno odvisne S-N diagrame. Rezultati kažejo, da višja temperatura drastično vplivna na znižanje izkoristka prenosa in skrajšanje življenjske dobe POM zobnikov.

• Language: Slovenian
• Keywords: Življenjska doba, S-N krivulje, temperatura, zobniki, POM, Razvoj preskuševališča, izkoristek
• Work type: Master's thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-97580
• Publication date in RUL: 27.10.2017

Secondary language

• Language: English
• Title: The effect of temperature on the lifespan of polymer gears

Abstract

The lifespan and mechanical properties of polymer materials depend on many factors. When speaking of thermoplastics, which are the most used group of technical polymers (even in gear technologies) due to ease of processing, we must stress a strong temperature dependence. This Masters’ dissertation assesses the effect of physical parameters, especially temperature and load on the lifespan of gears from polyoxymethylene (POM). A special test facility was developed for the purposes of this work, which enabled precise measurements of lifespan and efficiency of the gear pair at a constant, pre-set temperature of the gear tooth base. Based on the test matrix, 12 loading combinations were tested (three load levels and four temperatures) and at the end collected into temperature-dependent S-N diagrams. Results show that higher temperature drastically affects the lowering of transfer efficiency and the shortening of the lifespan of POM gears.

• Keywords: Lifespan, S-N curves, temperature, gears, POM, development of test facility, efficiency