magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo
Domen Hostnik (Author), Davorin Kramar (Mentor)

Abstract

Magistrski naloga obravnava optimizacijo procesa obdelave površine krogel za krogelne ventile, pri katerih se pojavlja problem neskladnosti kosov zaradi nestabilne obdelave. Ta je posledica premajhne togosti stroja, neustreznih obdelovalnih parametrov, ter vibracij iz okolice. Zaradi ozkih toleranc za premer krogel in hrapavosti površine je v magistrski nalogi, z uporabo statističnega nadzora procesa, določena stabilnost in sposobnost procesa, ter z metodo načrtovanja eksperimentov določeni optimalni procesni parametri. Z metodo načrtovanja eksperimentov je ugotovljeno, da imajo glavni vpliv na Ra vrtljaji, na Rt pa globina reza in podajanje. Z uporabo optimalnih parametrov je na procesu minimizirana hrapavost obdelane površine krogle in dosežen stabilen proces obdelave.

Keywords

magistrske naloge;krogelni ventili;krogle;struženje;medenina;načrtovanje eksperimentov;optimizacija;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [D. Hostnik]
UDC: 621.941:621.6(043.2)
COBISS: 16423707 Link will open in a new window
Views: 1137
Downloads: 456
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Other data

Secondary language: English
Secondary title: Optimization of the process parameters for improvement of turning balls for ball valves
Secondary abstract: Master's thesis is focused on optimization of the process of turning balls for ball valves, which has a problem of product inconsistency due to instability of the process. Its cause lies in limited rigidity of the machine, inadequate machining parameters and vibrations transmitted from the surroundings. Due to narrow tolerances for the diameter of the ball and surface roughness it was decided to use Statistical Process Control (SPC) for determining process stability and capability and Design of Experiments method (DOE) to determine optimal process parameters. With the use of DOE it was determined that spindle speed has the biggest effect on Ra and that feed and cutting depth have the biggest effect on Rt. With the use of optimal process parameters surface roughness of the balls was minimized and a stable process was achieved.
Secondary keywords: ball valves;balls;turning;brass;design of experiments;optimization;
Type (COBISS): Master's thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. Ljubljana, Fak. za strojništvo
Pages: XXII, 87 str.
ID: 10959171
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