Mehanska karakterizacija cevi iz sljude za izdelavo numeričnih simulacij hladnih preoblikovanj

Mavrar, Žiga (author), Halilovič, Miroslav (mentor), Starman, Bojan (comentor)

V magistrski nalogi je predstavljen del izdelave električnega konektorja, ki je del novodobnega izpušnega sistema. Ta omogoča električno ogrevanje katalizatorja pri hladnem zagonu motorjev z notranjim izgorevanjem ter tako zmanjša izpust emisij pod dovoljeno mejno vrednost, ki jih predvideva nov standard Euro 7. Ker gre za izdelek masovne proizvodnje, so za izdelavo konektorja uporabljeni procesi hladnih preoblikovanj. Sestavni deli konektorja so trije: elektroda in ohišje iz nerjavečega jekla ter izolacijska cev iz sljude. Sljuda je malokje uporabljena kot strukturni element, zato o njej ni dostopnih veliko mehanskih materialnih lastnosti, sploh glede njenega obnašanja med plastičnim preoblikovanjem. Cilj te naloge je, da se mehansko karakterizira cevi iz sljude in izdelata numeričnega modela krimpanja ter rotacijskega kovanja, tako da bo mogoče preko simulacij hitro napovedati končno obliko konektorja po preoblikovalnih procesih.

• Language: Slovenian
• Keywords: hladno preoblikovanje, sljuda, Inconel 600, rotacijsko kovanje, krimpanje, numerični model
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [Ž. Mavrar]
• Year: 2023
• Number of pages: XXIV, 70 str.
• PID: 20.500.12556/RUL-152099
• UDC: 621.983:679.867:004.942(043.2)
• COBISS.SI-ID: 172403203
• Publication date in RUL: 03.11.2023

Secondary language

• Language: English
• Title: Mechanical characterization of mica tubes for cold forming numerical simulations

Abstract

This master's thesis presents the assembly of an electrical connector, which is a part of a modern exhaust system. This system allows the catalytic converter to be electrically heated during the cold start of internal combustion engines, thus reducing emissions below the permissible limits set by the new Euro 7 standard. The connector has three components: a stainless steel electrode and a mica insulation tube, contained within housing. Mica is seldomly used as a structural element, therefore not much data is available on its mechanical material properties, especially about its behaviour during plastic deformation. The aim of this master's thesis is to mechanically characterise mica tubes and to develop numerical models of crimping and rotary swaging, so that the final shape of the connector after the forming processes can be rapidly predicted through simulations.

• Keywords: cold forming, mica, Inconel 600, rotary swaging, crimping, numerical model