1. Simulating and verifying a 2D/3D laser line sensor measurement algorithm on CAD models and real objectsRok Belšak, Janez Gotlih, Timi Karner, 2024, izvirni znanstveni članek Opis: The increasing adoption of 2D/3D laser line sensors in industrial and research applications necessitates accurate and efficient simulation tools for tasks such as surface inspection, dimensional verification, and quality control. This paper presents a novel algorithm developed in MATLAB for simulating the measurements of any 2D/3D laser line sensor on STL CAD models. The algorithm uses a modified fast-ray triangular intersection method, addressing challenges such as overlapping triangles in assembly models and incorporating sensor resolution to ensure realistic simulations. Quantitative analysis shows a significant reduction in computation time, enhancing the practical utility of the algorithm. The simulation results exhibit a mean deviation of 0.42 mm when compared to real-world measurements. Notably, the algorithm effectively handles complex geometric features, such as holes and grooves, and offers flexibility in generating point cloud data in both local and global coordinate systems. This work not only reduces the need for physical prototyping, thereby contributing to sustainability, but also supports AI training by generating accurate synthetic data. Future work should aim to further optimize the simulation speed and explore noise modeling to enhance the realism of simulated measurements.
Ključne besede: 2D/3D laser line sensor, profilometry, simulation, point cloud, measurement generation, STL, Matlab
Objavljeno v DKUM: 10.01.2025; Ogledov: 0; Prenosov: 1
 Celotno besedilo (8,99 MB)
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2. A holistic approach to cooling system selection and injection molding process optimization based on non-dominated sortingJanez Gotlih, Miran Brezočnik, Snehashis Pal, Igor Drstvenšek, Timi Karner, Tomaž Brajlih, 2022, izvirni znanstveni članek Opis: 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.
Ključne besede: conformal cooling, injection molding, tooling, additive manufacturing, numerical simulation, non-dominated sorting
Objavljeno v DKUM: 05.12.2024; Ogledov: 0; Prenosov: 3
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3. Simulacija postopka brizganja plastike s konformnim hlajenjemMarcel Hojnik, 2024, diplomsko delo Opis: Cilj naloge je bil nastaviti in izvesti simulacijo postopka brizganja plastike s konformnim hlajenjem za zagotovitev kratkega časa cikla izdelave ter visoke kakovosti procesa in izdelka. Naloga zajema kratko predstavitev področja brizganja plastike in primerjavo klasičnega hlajenja s konformnim. Na izbranem modelu se nato izvajajo simulacije in primerjave med tema postopkoma z namenom ugotovitve optimalnih parametrov, kot so velikost deformacije, temperature, čas in drugi. Na osnovi tega lahko sklepamo o učinkovitosti enega in drugega pristopa ter primerjamo velikost razlik.
Ključne besede: simulacija brizganje plastike, konformno hlajenje, hladilni kanali
Objavljeno v DKUM: 22.10.2024; Ogledov: 0; Prenosov: 15
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5. Avtomatizacija varjenja izdelka na varilnem robotu : diplomsko deloDavid Brečko, 2024, diplomsko delo Opis: V modernem času se v avtomobilski industriji trend robotizacije veča vsak dan. Zagotavlja bolj konstantno in nemoteno izdelavo, za nadzor je potrebnih le nekaj delavcev. V podjetju BNM funkcijo robotskega varjenja trenutno opravlja varilni robot Cloos, za katerega podjetje želi avtomatizirati čim več izdelkov. Ostalo je le še nekaj izdelkov, ki se varijo ročno.
V diplomski nalogi je predstavljena avtomatizacija robotskega varjenje za izdelka A 425 610 14 53 in A 425 610 15 53. Opisana je primerjava v času ročnega varjenja in robotskega varjenje, kvaliteti in izgledu varov. Predstavljena je nova konstrukcija za robotsko varjenje in postopek konstruiranja in izdelave nove varilne priprave.
Ključne besede: varjenje, varilna priprava, prilagoditev, modeliranje, konstruiranje, robot, varilni robot, robotizacija, avtomatizacija, normiranje, BNM, avtomobilska industrija
Objavljeno v DKUM: 30.09.2024; Ogledov: 0; Prenosov: 22
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6. Simulacija postopka brizganja plastike s prelivanjem : diplomsko deloVid Tršar, 2023, diplomsko delo Opis: Tema diplomskega dela je narediti simulacijo postopka brizganja plastike s prelivanjem. Najprej sem zapisal, kaj je postopek brizganja plastike s prelivanjem, kakšne tehnike poznamo, kateri materiali se uporabljajo in na katerih področjih se uporablja brizganje plastike s prelivanjem. V drugem delu diplomske naloge sem naredil simulacijo za brizganja plastike s prelivanjem za ročaj izvijača. Tu sem naprej po korakih opisal, kako sem izdelal celotno simulacijo. Opisal sem tudi, katere nastavitve za simulacijo sem uporabil. Na koncu so opisani in razloženi rezultati začetne simulacije, ki niso bili primerni. Zato sem naredil drugo simulacijo, pri kateri sem spremenil nastavitve in jo potem primerjal z začetno simulacijo.
Ključne besede: brizganje plastike s prelivanjem, simulacija, čas cikla, primerjalna študija
Objavljeno v DKUM: 03.07.2024; Ogledov: 147; Prenosov: 30
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7. Analiza procesa vodenja proizvodnje v podjetju Haberkorn d.o.o. : diplomsko deloMarsel Veselič, 2023, diplomsko delo Opis: Situacija na trgu je večno dinamična, zato se je trgu potrebno vedno znova prilagajati. V minulem letu se je ta dinamika še bolj razmahnila, saj je na trg vplivalo veliko večjih globalnih odločitev, ki so učinkovale tudi na proizvodnjo in njeno vodenje. Potrebna je bila prilagodljivost, potrpežljivost, borbenost in iznajdljivost za obstoj na trgu. Le tako je lahko podjetje delovalo in sledilo spremembam. Težnja vseh proizvodnih sistemov je optimizacija sistemov in povečanje obsega ob čim manjših stroških in naporih. V diplomski nalogi sem se v prvem delu posvetil opisu podjetja, njegovi zgodovini, področju delovanja, cilju in viziji. V nadaljevanju sem opisal teoretične osnove proizvodnje in njenega vodenja. Vse skupaj sem zajel na primerih iz prakse, ki sem jih spoznal v letih dela v podjetju. Podrobneje sem opisal vodenje kakovosti, korake proizvodnje in ovire, na katere je potrebno paziti. Vključil sem aktualno dogajanje v podjetju, širitev proizvodnih in skladiščnih prostorov. Ta je bila nujno potrebna za nadaljnje nemoteno delo. Predlagal sem možnosti izboljšav, ki bi podjetju prihranile stroške in čas.
Ključne besede: vodenje proizvodnje, pretočni časi, planiranje, standard kvalitete, izboljšave
Objavljeno v DKUM: 03.07.2024; Ogledov: 147; Prenosov: 52
Celotno besedilo (2,04 MB) |
8. Investigation of the best manufacturing orientation of Co-Cr-W-Si dental prosthetic elements in the selective laser melting processSnehashis Pal, Janez Gotlih, Igor Drstvenšek, 2022, izvirni znanstveni članek Opis: It is well known that Selective Laser Melting (SLM) does not provide the same mechanical
properties in all directions of the part. This is due to the microstructural grain orientation and
pore shape in SLM products. Therefore, depending on the direction of the pressure applied to the
SLM product, a different manufacturing orientation is required to achieve the best mechanical
properties. Changing the microstructural grain orientation is difficult through SLM, but a process
to reduce the size and number of the pores can be discovered through different combinations
of manufacturing parameters. In prosthodontics, pressure is usually applied in the vertical
direction, which leads to compression and bending of crowns with bridges. The compressive
load can be easily absorbed in the crowns, but the bending force has a significant effect here.
Therefore, a product with high tensile strength and high ductility is needed to survive longer.
Considering these requirements, this study determined the best parameters for laser processing
by SLM method to reduce porosity and improve mechanical strength and ductility of Co-CrW-Si alloy products. The result is a relative product density of 100% for cubic specimens and a
yield strength, ultimate tensile strength, and elongation at break of the tensile specimens of 900
MPa, 1200 MPa, and 15%, respectively, obtained in specimen build-up in the Z direction with a
laser power of 60 W and a scanning speed of 450 mm/s. Eventually, the best orientation for the
production of dental prosthetic elements using the SLM process was determined.
Ključne besede: cobalt-chromium alloy, dental implant, density, tensile strength, ductility, selective laser melting
Objavljeno v DKUM: 03.07.2024; Ogledov: 78; Prenosov: 8
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9. Dimensional deviations in Ti-6Al-4V discs produced with different process parameters during selective laser meltingSnehashis Pal, Marijana Milković, Riad Ramadani, Janez Gotlih, Nenad Gubeljak, Radovan Hudak, Igor Drstvenšek, Matjaž Finšgar, Tomaž Brajlih, 2023, izvirni znanstveni članek Opis: 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.
Ključne besede: dimension, Ti-6Al-4V, lase power, scanning speed, hatch spacing, selective laser melting
Objavljeno v DKUM: 29.03.2024; Ogledov: 219; Prenosov: 9
Celotno besedilo (4,48 MB)
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10. Izdelava poprocesorja v Siemens NX za 3D varjenje s KUKA robotom : magistrsko deloRobert Plevčak, 2023, magistrsko delo Opis: Cilj magistrske naloge , je bila zasnova in realizacijaizvedba poprocesorja za vodenje zavariti ravno steno s pomočjo industrijskega robota KUKA in inverterskega varilnega aparata, s katerim smo varili s postopkom MAG, z namenom kreiranja varjenih volumskih oblik.naloge je bil zavariti ravno steno s pomočjo robota. Za generiranje programa smo uporabili programsko opremo Siemens NX, kjer je bilo potrebno na novo vnesti željeniželeni robot v knjižico obdelovalnih strojev. Pred vnosom smo določili kinematiko in območje delovanja robotskega manipulatorja. Za lažjoe konfiguracijo točke vrha orodja, smo v knjižico orodij prav tako na novo vnesli novo le tegaorodje v knjižico orodij. Pred testiranjem na realnem sistemu smo uredili poprocesor, ter ugotovili optimalne parametre varjenja. Po uspešnem varjenju ravne stene smo zavarili še polni kvader in nagnjeno steno.
Ključne besede: Siemens NX, industrijski robot, varjenje, dodajalna proizvodnja, KUKA
Objavljeno v DKUM: 21.12.2023; Ogledov: 549; Prenosov: 49
Celotno besedilo (8,24 MB) |
