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1.
Skrajševanje časa obdelave čepa polgredi : diplomsko delo
Blaž Leskovar, 2024, undergraduate thesis

Abstract: Zaradi konkurenčnosti v avtomobilski industriji se nenehno iščejo rešitve za skrajšanje časa obdelave in s tem pocenitvijo proizvodnje. tako sem v okviru diplomske naloge v podjetju GKN Driveline Slovenija d.o.o. poskušal skrajšati čas obdelave na čepu polgredi.
Keywords: Proizvodne tehnologije, struženje, izdelava ozobij
Published in DKUM: 11.04.2025; Views: 0; Downloads: 10
.pdf Full text (2,10 MB)

2.
Mechanisms of defect formation in Ti-6Al-4V product during re-melting of layers in selective laser melting
Snehashis Pal, Matjaž Finšgar, Radovan Hudak, Viktoria Rajtukova, Tomaž Brajlih, Nenad Gubeljak, Igor Drstvenšek, 2023, original scientific article

Abstract: Knowledge of defect formation mechanisms in the manufacturing process helps improve product quality. In this study, defect formation due to re-melting of each layer in selective laser melting of Ti-6Al-4V demonstrated the physical behavior in the manufacture of metallic parts. The re-melting strategy was based on scanning with low energy density (ED) and increased ED with various combinations of laser processing parameters. The increased EDs and their parameters, namely laser power, scanning speed, and hatch distance, were selected based on the previous research experience by the authors. The concept of selecting a low ED followed by a high ED was to reduce the spattering of the powder material during the process. The low ED caused partial sintering of the powder, while the high ED caused the melting of the material, resulting in different metallurgical properties of the manufactured parts. Densities, pore properties, porosity in the initial layers, surface morphologies, and microstructures in the defective areas of the samples were studied to determine the effects of re-melting. Advantages and disadvantages were found with respect to the range of applications of the products
Keywords: re-melting, pore properties, defect, surface morphology, Ti-6Al-4V, selective laser melting
Published in DKUM: 14.03.2025; Views: 0; Downloads: 2
.pdf Full text (16,16 MB)

3.
Zasnova in izdelava CNC stroja za lasersko graviranje
David Fridrih, 2025, undergraduate thesis

Abstract: Pred izdelavo stroja za lasersko graviranje je bilo potrebno izbrati želeno obliko in konstrukcijo. Izdelali smo osnovno skico, nato je sledila izdelava CAD modela. Ta model nam je omogočal preverjanje skladnosti raznih komponent med sabo. Vse plastične komponente stroja smo izdelali s pomočjo 3D tiska, pogonsko os pa s struženjem. Vse ostale komponente smo kupili (vijake, motorje, elektroniko). Stroj se giblje po X- in Y-osi, po Z-osi pa ga je mogoče nastavljati samo ročno. Glavni gibanji stroja se ne opravljata po vodilih, temveč se voziček vozi s kolesi po utoru profila. Gibanje se opravlja preko motorjev na jermena. Za to sta uporabljena dva motorja, ki ju krmili krmilnik na zadnji strani ohišja. Stroj mora biti med obratovanjem ves čas priključen na računalnik.
Keywords: CNC stroj, CAD model, lasersko graviranje, 3D tisk
Published in DKUM: 04.03.2025; Views: 0; Downloads: 75
.pdf Full text (2,16 MB)
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4.
A holistic approach to cooling system selection and injection molding process optimization based on non-dominated sorting
Janez Gotlih, Miran Brezočnik, Snehashis Pal, Igor Drstvenšek, Timi Karner, Tomaž Brajlih, 2022, original scientific article

Abstract: This study applied a holistic approach to the problem of controlling the temperature of critical areas of tools using conformal cooling. The entire injection molding process is evaluated at the tool design stage using four criteria, one from each stage of the process cycle, to produce a tool with effective cooling that enables short cycle times and ensures good product quality. Tool manufacturing time and cost, as well as tool life, are considered in the optimization by introducing a novel tool-efficiency index. The multi-objective optimization is based on numerical simulations. The simulation results show that conformal cooling effectively cools the critical area of the tool and provides the shortest cycle times and the lowest warpage, but this comes with a trade-off in the tool-efficiency index. By using the tool-efficiency index with non-dominated sorting, the number of relevant simulation cases could be reduced to six, which greatly simplifies the decision regarding the choice of cooling system and process parameters. Based on the study, a tool with conformal cooling channels was made, and a coolant inlet temperature of 20 °C and a flow rate of 5 L/min for conformal and 7.5–9.5 L/min for conventional cooling channels were selected for production. The simulation results were validated by experimental measurements.
Keywords: conformal cooling, injection molding, tooling, additive manufacturing, numerical simulation, non-dominated sorting
Published in DKUM: 05.12.2024; Views: 0; Downloads: 5
.pdf Full text (6,87 MB)
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5.
Obnašanje toge avksetične strukture izdelane iz PLA filamenta znotraj TPMS celice iz elastičnega TPU filamenta : magistrsko delo
David Gorup, 2024, master's thesis

Abstract: Magistrsko delo je eksperimentalne narave. Modelirali smo TPMS celico gyroida in znotraj celice oblikovali avksetično geometrijo. Geometrija je izdelana iz bolj togega PLA filamenta, ostanek celice pa iz elastičnega TPU filamenta. Nato je bil izveden 3D-tisk več vzorcev, vključno z vzorci z majhnimi variacijami, kar je omogočilo primerjavo vpliva različnih sprememb geometrije. Mehansko testiranje je izvedeno tako, da so bili vzorci stisnjeni med dvema ploščama, pri čemer smo beležili sile stiskanja in istočasno snemali za nadaljnjo analizo z DIC programom. Pri analizi rezultatov smo primerjali SEA, CFE in Poissonovo število.
Keywords: avksetična struktura, 3D-tiskanje, PLA filament, TPU filament, TPMS celica, gyroid, SEA, CFE, Poissonovo število
Published in DKUM: 22.08.2024; Views: 63; Downloads: 20
.pdf Full text (3,38 MB)

6.
Dimensional deviations in Ti-6Al-4V discs produced with different process parameters during selective laser melting
Snehashis Pal, Marijana Milković, Riad Ramadani, Janez Gotlih, Nenad Gubeljak, Radovan Hudak, Igor Drstvenšek, Matjaž Finšgar, Tomaž Brajlih, 2023, original scientific article

Abstract: When manufacturing complicated products where both material and design play a role, especially thin and curved components, it is difcult to maintain accurate dimensions in Selective Laser Melting. Considering these difculties, this article presents the dimensional errors in the fabrication of Ti-6Al-4V discs and their thermomechanics during manufacturing. Various combinations of laser processing parameters were used to fabricate the 2.00 mm thick discs with a diameter of 5.70 mm. It was found that the thickness shortened and the round shape changed to an oval shape for most of the discs. The thickness decreased along the build-up direction from the bottom to the top and formed a taper that increased with increasing energy density (ED). The horizontal diameter of the discs changed slightly, while the vertical diameters changed remarkably with increasing ED. On the other hand, reducing the laser power resulted in a reduction of the roundness error, while it caused a reduction of the thickness. The hatch spacing signifcantly afected the volume of the melt pool and caused a change in the vertical diameter. The central part of the curved surface of the discs became concave and the concavity increased due to the increasing ED.
Keywords: dimension, Ti-6Al-4V, lase power, scanning speed, hatch spacing, selective laser melting
Published in DKUM: 29.03.2024; Views: 219; Downloads: 9
.pdf Full text (4,48 MB)
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7.
Raziskava možnosti skrajševanja nastavitvenih časov na računalniško krmiljenem rezkalnem stroju : diplomsko delo
Žan Ozmec, 2023, undergraduate thesis

Abstract: Tema diplomske naloge izhaja iz podjetja Mark Metal d.o.o. in se nanaša na njihov 3-osni CNC rezkalni stroj Hermle C400, naloga pa je zmanjšati nastavitvene čase. Diplomsko delo predstavlja podroben opis in značilnosti rezkanja, opis vpenjanja in programiranja CNC rezkalnega stroja ter menjavanja orodij. V diplomskem delu sem predstavil tudi vplive in razloge za nastavitvene čase v podjetju. V nadaljevanju sta opisani metodi 5S in SMED. Raziskal sem tudi čase na stroju pred raziskavo, naredil program v Excelu, ki razvršča obdelovance glede na predpisane pogoje. Na koncu diplomskega dela so podani rezultati in ugotovitve raziskave, ter sklep.
Keywords: Rezkanje, CNC rezkalni stroj, nastavitveni čas, zmanjšanje
Published in DKUM: 18.03.2024; Views: 341; Downloads: 62
.pdf Full text (1,94 MB)

8.
Zasnova tehnologije končne izdelave navojev na konstrukcijskih elementih po zaščitnem površinskem nanosu : diplomsko delo
Gregor Klep, 2023, undergraduate thesis

Abstract: Diplomsko delo opisuje snovanje procesa po površinskem zaščitnem nanosu v podjetju Hanželič d.o.o.. Reševanje problema smo se lotili tako, da smo izkoristili sredstva, katera so že prisotna v samem podjetju. Cilj je bil, da s čim manj vloženega časa in denarja oblikujemo zanesljiv proces, ki bo kompatibilen z ostalo proizvodnjo. Pri samem snovanju smo upoštevali izkušnje starejših delavcev ter znanje mlajših, kar je pripomoglo k rešitvi problematike naročila.
Keywords: zasnova procesa, vrtanje, serijsko delo, izdelava navojev
Published in DKUM: 28.02.2024; Views: 198; Downloads: 35
.pdf Full text (1,02 MB)

9.
10.
Programiranje cnc strojev za obdelavo stenskih elementov : diplomsko delo
Domen Kovačič, 2023, undergraduate thesis

Abstract: V diplomskem delu je zajeta zgodovina podjetja ter opis njihovih izdelkov, opisana je zgodovina in razvoj NC-obdelovalnih strojev, prav tako tudi možnosti programiranja ter postopek obdelave. Diplomsko delo govori predvsem o programiranju CNC obdelovalnega stroja. Predhodni način dela je predstavljal dolgotrajnejši postopek izdelave, saj je bil pred vsako namensko izdelavo panelov potreben ponovni izris in določitev parametrov na samem stroju. Izdelan je bil izris tlorisov, med drugim je bilo izvedeno programiranje CNC obdelovalnega stroja, na koncu pa je sledila še izdelava ter vgraditev panela v bivalno enoto.
Keywords: bivalne enote, CNC, programiranje, izdelava, paneli
Published in DKUM: 07.07.2023; Views: 355; Downloads: 60
.pdf Full text (3,31 MB)

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