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Title:Optimiranje odrezavanja gradientnega materiala pri frezanju
Authors:ID Irgolič, Tomaž (Author)
ID Čuš, Franc (Mentor) More about this mentor... New window
ID Župerl, Uroš (Comentor)
Files:.pdf DOK_Irgolic_Tomaz_2015.pdf (16,64 MB)
MD5: DEE64926EECAF304415B409C67A86D49
 
Language:Slovenian
Work type:Dissertation
Typology:2.08 - Doctoral Dissertation
Organization:FS - Faculty of Mechanical Engineering
Abstract:Uvajanje tehnologije laserskega navarjanja kovinskih materialov s postopkom LENS v zadnjem času pridobiva na veljavi in uporabnosti za namene popravila strojnih delov in gravur preoblikovalnih orodij. Kljub zelo dobrim dosežkom navarjanja plasti kovinskih materialov, je še vedno potrebna naknadna obdelava navarov s postopki odrezavanja. Dosedanji način poobdelave navarjene površine je bil s postopkom brušenja. Način brušenja navarjenih plasti je dal do sedaj ustrezne rezultate. Slabost brušenja v primerjavi s frezanjem pa je manjši odvzem materiala v enaki časovni enoti. Prav zaradi tega je raziskava v okviru doktorske disertacije potekala v smeri nadomestitve procesa brušenja s procesom frezanja. Cilj raziskave je bil ugotoviti vpliv parametrov stroja za lasersko navarjanje na dobljene hrapavosti in valovitosti navarjenih površin gradientnih materialov. Problem navarjenih materialov je površina, ki ne ustreza standardu hrapavosti N6, kar je bil naš zastavljen cilj. Zato je potrebno navarjene površine dodatno obdelati, za kar smo si izbrali proces frezanja z oblikovnim krogelnim frezalom. Z raziskavami smo dokazali, da je možno nadomestiti proces brušenja s procesom frezanja. Površina vseh izdelanih vzorcev je bila predhodno skenirana s tri-razsežnim optičnim skenerjem. S skeniranjem se je zagotovil oblak točk, na podlagi katerega sta se v nadaljevanju disertacije izračunala srednji aritmetični odstopek navarjenega profila Ra, največja višina izbočin Rp in debelina navarjenih plasti. Za ugotavljanje debeline navarjenih plasti se je izdelal uporabniški vmesnik za merjenje debeline in analizo navarjenih plasti. S pomočjo izračunov se je v nadaljevanju izračunala minimalna potrebna globina frezanja z oblikovnim krogelnim frezalom, ki je potrebna, da dobimo poobdelano površino navarjenih plasti. Vsi vzorci, ki so bili obdelani s frezanjem, so imeli končno kvaliteto površine stopnje N6 oziroma boljšo. Seveda je izbira rezalnih parametrov za poobdelavo navarjenih plasti gradientnih materialov s procesom frezanja ključnega pomena. Zato je pomembno, da poznamo trdoto materiala, njegovo kemijsko sestavo in pripadajoče mehanske lastnosti. Le-te so v veliki meri odvisne od predhodno izbranih parametrov stroja za navarjanje. Tekom raziskave pridobljeni rezultati so bili shranjeni v namensko izdelano podatkovno bazo. Ta je uporabniku prijazna in mogoča hiter pregled osnovnih podatkov o materialu, pregled izmerjenih rezalnih sil pri izbranih rezalnih pogojih in grafično primerjavo izmerjenih rezalnih sil pri različnih rezalnih parametrih. Celotna raziskava doktorske disertacije zajema predstavitev problema, osnove delovanja stroja za lasersko navarjanje in seveda vrsto preizkusov, kjer se je skenirala površina navarjenih slojev, izračunala pripadajoča hrapavost in valovitost površine in seveda vršila nadaljnja obdelava navarjenih plasti gradientnih materialov s procesom frezanja.
Keywords:frezanje, gradientni material, LENS, optimizacija odrezavanja
Place of publishing:Maribor
Publisher:[T. Irgolič]
Year of publishing:2015
PID:20.500.12556/DKUM-55133 New window
UDC:621.941-048.34:621.791.725.053(043.3)
COBISS.SI-ID:282117120 New window
NUK URN:URN:SI:UM:DK:EO86140D
Publication date in DKUM:06.11.2015
Views:1976
Downloads:193
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
:
IRGOLIČ, Tomaž, 2015, Optimiranje odrezavanja gradientnega materiala pri frezanju [online]. Doctoral dissertation. Maribor : T. Irgolič. [Accessed 26 March 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=55133
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Secondary language

Language:English
Title:Optimisation of cutting graded material using the milling process
Abstract:The introduction of technology regarding metal material laser cladding using LENS technology has recently been gaining in importance and usefulness for the purposes of repairing machine parts and engravings of forming tools. Despite the very good achievement of cladding regarding metal layers, it is still necessary to re-machine cladded layers using cutting processes. The current method of post-processing welded surfaces is with the grinding process. The grinding process has given adequate results so far but of course the grinding process is very time-consuming. That is why research within the context of a PhD thesis was directed towards the replacement of the grinding process with the milling process. The aim of this study was to determine the influence of machine parameters for laser cladding on the resulting roughness and corrugation of the welded surface of gradient material. The problem of laser cladded material is the surface that does not meet the standard roughness N6, which has been our stated goal. It is therefore necessary to further process the welded areas for which we have selected the process of milling with a ball- end mill. Through research, we have demonstrated that it is possible to replace the grinding process by the milling process. The surfaces of all the manufactured samples had been previously scanned with a three-dimensional optical scanner. The scanning process provided the point cloud, based on which they hereinafter had duties for calculating the mean arithmetic deviations of cladded profile Ra, the maximum height of the protrusions Rp and the thicknesses of the welded layers. In order to determine the thickness of the clad layer’s user interface for thickness measurements and analyses were made of welded layers. By means of the calculations given below for calculating the minimum required depth of milling with a ball-end milling cutter, which is needed for obtaining re-machined surfaces of the welded layers. All samples were processed by milling and had final surface qualities of N6 grades or better. Of course, the choice of cutting parameters for re-machining clad layer gradient material with the milling process is crucial. It is therefore important to know the hardness of the material, its chemical composition and associated mechanical properties. Only these are largely dependent on the previously selected parameters of the machine for surfacing. During the research the results obtained were stored within a specially designed database. This is user-friendly and allows for a quick overview of basic information about the material, reviewing the measured cutting forces under the selected cutting conditions and graphical comparison between measured cutting forces in different cutting parameters. This full survey doctoral thesis includes a presentation of the problem, the base of the machine for laser cladding and of course a series of tests where the scanned surface weld layer, calculating the corresponding surface roughness and waviness and, of course, were made in further processes for the weld layer gradient materials with the process of milling.
Keywords:milling, graded material, LENS, optimisation of cutting


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