Struženje s pulzirajočim dovodom hladilno-mazalne tekočine

Turk, Klemen (author), Pušavec, Franci (mentor)

V magistrskem delu je predstavljen razvoj, testiranje in študija sistema, ki omogoča pulzirajoče visokotlačno odrezavanje pri procesu struženja. Podana sta pregled in primerjava odrezavanja s klasičnim oblivanjem in visokotlačnim odrezavanjem na podlagi katerih se je razvilo sistem, s katerim bi se odpravilo oziroma izboljšalo slabosti obstoječih sistemov. Lastnosti, zaradi katerih so materiali na osnovi nikljevih in titanovih zlitin zaželeni v strojništvu med drugim močno otežujejo njihovo obdelavo do končne komponente. Pri obdelavi takšnih materialov je prisotna močno povišana temperatura v rezalni coni, kar pa povzroči visoke obremenitve na rezalnem orodju in s tem krajšo obstojnost le-tega. Eden takšnih materialov je Inconel 718, katerega se težko obdeluje zaradi več vzrokov, med drugim zaradi slabe toplotne prevodnosti, deformacijskega utrjevanja, odpornosti na korozijsko obrabo, itd. Namen eksperimentalnega dela je bilo ugotoviti vpliv pulzirajočega visokotlačnega curka na proces struženja, predvsem na proces in nadzor tvorjenja odrezkov, na rezalne sile med odrezavanjem, na porabo energije in na obrabo orodja. Ugotovljeno je bilo, da ima pulzirajoče visokotlačno odrezavanje veliko potenciala saj uspešno omogoča nadzor nad nastankom odrezkov, zahteva manj vnosa energije v proces in znižuje rezalne sile napram odrezavanju s klasičnim oblivanjem. Z vidika obstojnosti orodja je le-ta v primerjavi z visokotlačnim odrezavanjem slabša a boljša kot pri odrezavanju s klasičnim oblivanjem.

• Language: Slovenian
• Keywords: struženje, obstojnost orodij, visokotlačno odrezavanje, Inconel 718, hibridni postopek odrezavanja
• Work type: Master's thesis
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Publisher: [K. Turk]
• Year: 2018
• PID: 20.500.12556/RUL-102574
• UDC: 621.941:674.057(043.2)
• COBISS.SI-ID: 16396571
• Publication date in RUL: 02.09.2018

Secondary language

• Language: English
• Title: Turning with pulsating supply of the cutting fluid

Abstract

This master thesis shows the development, testing and study of a system that enables pulsating high pressure assisted turning. Overview and comparison with classic turning and high pressure assisted turning is done. That is the basis on which the mentioned system was developed and compared with the intention of improving/eliminating other systems shortcomings. Properties of nickel and titanium based alloys that make them desirable engineering materials are the same properties that define them as hard-to-cut materials. High temperature in the cutting zone causes high stress and load on the cutting tool and effectively lowers tool life. One of such materials is Inconel 718, which has low thermal conductivity, high corrosion resistance, shows deformation hardening, etc. The purpose of the conducted experiments was determining the effect of pulsating high pressure assisted machining on the process of turning with focus on control of chip formation, cutting forces during machining, energy consumption of the system and tool wear. It was found that pulsating high pressure turning has a lot of potential as it shows greater control over chip formation and breakability, requires less energy for turning compared to high pressure turning and lowers the cutting forces compared to classic turning. Tool wear is worse when compared to high pressure turning but better compared to classic turning.

• Keywords: turning, Tool life, High pressure assisted turning, Inconel 718, hybrid machining processes