Accept contributions

  • A complete flexible feeding system for segmentation and sorting of products on the production lineMatjaž Kovačič, MIEL, d.o.o.


    Andrej Rotovnik, MIEL, d.o.o.

    The article represents a universal part feeding solution for segmentation and sorting of products on the production line. The solution involves a vibrating feeder, a machine vision system, articulated or SCARA robot and a fast communication between individual segments and external devices. This solution is considered as indispensable in almost every production process, where we face the challenges of optimal sorting, insertion, repositioning of products or their components.
  • Advanced planning and scheduling in Jaksche TechnologyIgor Gruden, CADCAM Lab d.o.o.


    Heidrun Andre, Jaksche Kunststofftechnik GmbH
    Benjamin Hamzić, CADCAM Solutions d.o.o.

    No manufacturing environment can operate without a plan and the plans must be made at multiple \'levels\' (Sales and Operations, Production planning, Production scheduling) considering different time frames.
    Planner is faced with difficult task: make an optimal manufacturing plan and production schedule, in order to achieve best performance in terms of maximizing assets utilization, shorten production lead times, synchronize flow of material, minimize stock and increase stability of plan. At the end of the day planner wants to have complete control over planning and customer service should be at high levels.
    In the paper we present some experience and data gained in the process of implementing the planning and scheduling solution in Jaksche Technology company in their plant in Bosnia and Herzegovina.
    For the successful implementation of Advanced Planning and Scheduling software (APS) it is preferred for a company to have a very good and well implemented ERP and MES system.
    Implementing the APS solution takes about four to six months depending on the size of company.
    During the implementation we made a digital copy of production with all the machines, operations, operators, and other constraints that can be found in production. Jaksche Technology wants to achieve the following benefits: delivery on time, management of human skills, reporting and better usage of molds (maintenance, availability) which is their biggest problem.
    Jaksche has ERP, MES and now ORTEMS as APS system which connects all the databases together. We present the testing phase, which lasted two months, where we confirmed that their manufacturing became more flexible, adaptable and responsive.
  • Altair SimSolid – rapid iterations without meshing Elena Mazilu, Weiss Simulation d.o.o. | Altair Partner


    Computer Aided Design (CAD) and Computer Aided Engineering (CAE) are intrinsic parts of modern engineering. CAE simulation tools are extremely important because they allow for performance validation and optimization of a product design before the product is physically created. Today this is typically done using software based on Finite Element Analysis (FEA).
    The weak link in traditional FEA is the need to create an accurate and efficient finite element mesh. The meshing process would typically fail if done on original geometry or produces excessive number of elements which would often make FEA impractical.
    Altair SimSolid™ is intended to drastically streamline simulation process and increase engineering productivity by replacing the underlying FEA technology, rather than through improvements to the user interface. New technology eliminates the most failure-prone and skills/labor consuming stages of analysis process.
    SimSolid is a simulation software application which performs statics, dynamics and thermal, analyses of structural systems. SimSolid always uses fully featured, not simplified, solid geometry models in the analysis and does not use a mesh.
    This presentation will provide you the basic understanding of what SimSolid can offer and how our customers save a lot of time while performing their simulations.
    We will showcase examples of:
    • Renault - simulation of their chassis components that took them from 25x to 100x reduction lead time and precision of 5% compared to traditional FEA workflow.
    • NAFEMS benchmark on SimSOlid - results and discrepancies
    • Stage Wagon of Quintai Culture & Art Center from China – assembly of over 7000 parts, model setup in 60 minutes and 30 min solving the simulation
    And some more.
  • Bio-composites from recycled polypropylene and wastepaperSilvester Bolka, Fakulteta za tehnologijo polimerov


    Teja Pešl, Fakulteta za tehnologijo polimerov
    Rebeka Lorber, Fakulteta za tehnologijo polimerov
    Tamara Rozman, Fakulteta za tehnologijo polimerov
    Rajko Bobovnik, Fakulteta za tehnologijo polimerov
    Miroslav Huskić, Fakulteta za tehnologijo polimerov

    In this paper, we present the development of bio-composites with recycled polypropylene (rPP) matrix delivered by the company TAB-IPM d.o.o., wastepaper as a filler delivered by the company Papirnica Vevče Proizvodnja d.o.o., and maleic anhydride grafted polypropylene (PP-g-MA) compatibilizer.
    Compounding was performed on the twin-screw extruder. The addition of wastepaper was 5 wt.%, and 10 wt.%, the addition of PP-g-MA was 4 wt.%. For the characterization purposes, the test pieces were prepared by injection moulding according to ISO 527 (form 1BA), ISO 178, and ISO 179. Bending E modulus was higher with the addition of the wastepaper (for 15 % and 23 % at 5 wt.% and 10 wt.% of wastepaper respectively) and also bending strength was higher (for 7% and 10% at 5 wt.% and 10 wt.% of wastepaper respectively). The results of the tensile tests and DMA tests show the same tendency. The higher moduli and also higher strength indicate high compatibility of the bio-composites. With addition of 10 wt.% wastepaper, the thermal conductivity, the impact strength and degradation temperature were increased, while the melting and crystallization temperature remained the same.
    The authors would like to acknowledge the financial support received in the frame of the Slovenian smart specialization program (CEL.CYCLE - http://celkrog.si/?lang=en, grant number C3330-16-529004).
  • Collaborative and industrial robots – what do we really want, collaborativeness or speed of robots?Tim Vrbančič, Inea RBT d.o.o.


    Jan Kramžar, Inea RBT d.o.o.

    Collaborativeness also means safety, while speed in case of robots means short cycles. Collaborative robots without any doubts deliver unique functionalities – beside higher safety, robot arm can be hand-guided, and programming of robot moves is simplified and intuitive, which enables higher flexibility of robot process. Industrial robots on other hand are faster, designed for fast cyclising, large production series and are bringing higher precision. Industrial robots with help of safety sensors can become also (limited) collaborative – in case of operator interference in working area, robot can slow down or stop, however highest possible collaborativeness (what is possible to achieve with collaborative robots) can not be achieved with industrial robots. Most of time standard industrial robot with collaborative equipment/functions will be fast, process will be productive and robot will work in collaborative mode only when needed. In case of collaborative robot applications questions can arise regarding other factors of robot application. Can sharp, hot and other dangerous workpieces be part of collaborative robot application? Risk level of collaborative process is hard to assess, however it is also needed to satisfy ISO safety standard which determines highest speed, power and force of robot movements and ergonomics of robot in application. In this article we will try to clarify mentioned problematics, beside that we will list possible use cases, where usage of collaborative robot really makes sense.
  • Data integrity as a key to quality assurance during production processPeter Korenčan, Inden d.o.o.


    Dušan Božič, Inden d.o.o.

    The key to quality assurance in the modern production process is data integrity, throughout different departments, processes, and analyses. Slovenian manufacturing companies are, for the most part, producing parts for bigger manufacturing companies for Central Europe. The desire for the attainment of higher prices on the market and growing foreign competition in a sector of cheaper products, is fuelling the increased interest in assuring the higher quality of the production process. Which can be attained solely through good planning, measuring, analysis and action. A lot has been written about implementation of the methods such are FMEA, APQP, and Inspection Plans. Many Slovenian companies have undertaken the implementation of those as well in their interest or customers\' request. However, the persistent problem that is usually left unchecked is the compliance and agility of those and other methods. Since changes in one of the methods usually impact others. Through studies of some examples, we have determined the possibilities and advantages of the implementation of CAQ systems in the production process.
  • Determination of residual stresses in injection moulded samples of amorphous polymersMiroslav Huskić, Fakulteta za tehnologijo polimerov


    Tamara Rozman, Fakulteta za tehnologijo polimerov, 2380 Slovenj Gradec
    Blaž Nardin, Fakulteta za tehnologijo polimerov, 2380 Slovenj Gradec
    Kristjan Krebelj, “Tehnoplast”, Anton Krebelj s.p.
    Dragan Kusić, TECOS, Razvojni center orodjarstva

    In amorphous transparent materials such as polymethyl methacrylate (PMMA), acrylonitrile butadiene styrene (ABS) and polycarbonate (PC), visible defects in the form of microcracks often occur. These are most often formed after the contact of products with detergents or alcoholic solutions. Defects can be prevented by heating the product to a temperature close to the material glass transition temperature. How big these stresses are, at what temperature the material needs to be heated, and for how long, however, is largely unknown.
    Polycarbonate test samples were prepared by injection moulding at various mould temperatures (50-80 °C) and the mechanical (tensile and bending), thermal (DSC) and thermomechanical (DMA) properties were determined. The rest of the samples were tempered at various temperatures (80-130 °C) and at various times (1 h and 3 h). After tempering, we performed the characterization again. Stresses in the material affect the mechanical properties. They increase the elastic and flexural modulus and notch toughness while lowering the strength. For the time being, the stresses in the material can be qualitatively determined by DMA, where they are reflected in higher values of the loss modulus and damping factor (tan delta) at temperatures below the glass transition.
    The results will show, that with the application of advanced analytical methods, industrial challenges can be solved.
  • Development of automatic weaving machine Rok Jesenek, Žična kovina d.o.o.


    Peter Jelenko, Peter Jelenko s.p.
    Gašper Gantar, Visoka šola za proizvodno inženirstvo, Visoka šola za varstvo okolja

    Dedicated weaving machines are used for production of products made of woven corrugated steel wire. Such machines are semi-automatic (the operator must manually insert the transverse wires) or automatic. The project partners have developed a completely new automatic weaving machine for small series production, which has many technical advantages over competing machines (larger range of wire thickness, achievable range of opening in weaving, machine price…). The paper will show the development process, which was carried out using modern methods and was performed in accordance with the guidelines VDI-R 2221 and results.
  • Development, manufacturing, and clinical testing of custom hip implant for a patient with large acetabular bone defectUrška Kostevšek Šegula, Fakulteta za strojništvo Univerze v Mariboru


    Igor Drstvenšek, Fakulteta za strojništvo Univerze v Mariboru
    Tomaž Brajlih, Fakulteta za strojništvo Univerze v Mariboru
    Matjaž Vogrin, Univerzitetni klinični center Maribor
    Andrej Moličnik, Univerzitetni klinični center Maribor

    Large bone defects in total hip arthoplasty are becoming more common. In cases of large defects and bone loss in acetabular defects, conventional or modular endoprostheses are commonly used. However, often these endoprostheses are not sufficient to establish hip stability.
    In this study custom-made medical devices have been developed and clinically tested. The presented method consists of dimensional operational planning, the manufacturing of custom-made medical devices, clinical trial and the post-operative analysis of implant\'s position.
    With a developed and clinically tested method, the achievable precision was determined, and the operational technique simplified. Three-dimensional planning and operational procedure within the method was more transparent, more reliable and safer. The method did not only improve the operational technique, but also by using a custom-made implant, the stability of the hip was improved, the symmetry was assured, and the congenital anatomy was recovered.
  • Dust particles emissions at stainless steel weldingBorut Kosec, Univerza v Ljubljani, Naravoslovnotehniška fakulteta


    Nenad Petić, Univerza v Ljubljani, Naravoslovnotehnška fakulteta
    Milana Ilić Mićunović, Univerzitet u Novom Sadu, Fakultet tehničkih nauka
    Mirza Imširović, Univerza v Ljubljani, Naravoslovnotehnška fakulteta
    Damjan Klobčar, Univerza v Ljubljani, Fakulteta za strojništvo
    Igor Budak, Univerzitet u Novom Sadu, Fakultet tehničkih nauka
    Zorana Tanasić, Univerza v Ljubljani, Fakulteta za strojništvo
    Aleš Nagode, Univerza v Ljubljani, Naravoslovnotehnška fakulteta

    During welding procedures a lot of gases are emitted into the air, which can damage the health of the workers. Gases have different compositions and contain dust particles, which can provoke certain risks when inhaled by the workers. The degree of risk depends on the composition, concentration and time exposed to the harmful gases. Composition of gases depends on usage of different welding procedures, basic material and electrode.
    The idea of diploma work was to measure the emission of dust particles during manual arc welding of stainless steel with and without the use of ventilation device.
    Filtration of dust particles was conducted by EGO PLUS TT measuring instrument. Composition and geometry of dust particles were examined according to the standard ISO 13322 using using field emission scanning electron microscope Thermo Scientific Quattro S.
  • External turning tool condition monitoring using IR thermography and convolutional neural networkDavid Potočnik, Fakulteta za strojništvo UM


    Nika Brili, Fakulteta za strojništvo UM
    Mirko Ficko, Fakulteta za strojništvo UM
    Simon Klančnik, Fakulteta za strojništvo UM

    Turning is a widely used cutting process in industry. Any optimisation of this process can have a significant impact on improving product quality, reducing costs or adverse events. By using automated tool condition monitoring (TCM) we can reduce costs, increase efficiency, and reduce the number of adverse events that occur during machining (scrap parts, tool breakage, …). In the case of individual or small-batch production, the control of tool wear is performed manually by the machine operator. Such determination of tool wear is left to subjective judgement and requires the operator to interfere in the process. The presented solution solves this problem by using automated monitoring of the cutting tool condition. To monitor the turning process, an IR camera was used, which also captures thermographic state. The camera has been adequately protected and placed right next to the turning tool, which allows process monitoring from close range. During the experiment, constant cutting parameters were set for turning the workpiece (low alloy carbon steel 1.7225 or 42CrMo4) without the use of coolant. To build a dataset of over 6,000 images, the machining process was performed on a lathe with tool inserts of different wear levels. Using a Convolutional Neural Network (CNN), a model for tool wear and tool damage prediction was developed. It determines the state of the cutting tool automatically (no, low, high wear level) based on the captured thermographic image during the turning process. The achieved accuracy of classification was 99.55 %, which affirms the adequacy of the proposed method. Such system enables immediate action in the case of cutting tool wear or breakage, regardless of the operator\'s knowledge and skills.
  • Front of a car components industrialization challengesPavel Oblak, Hella Saturnus Slovenija d.o.o.


    Aleš Adamlje, Hella Saturnus Slovenija d.o.o.

    Modern trend in the automotive industry strongly also effects a front end of a car. This is especially noticeable at electric vehicles, where, due to elimination of cooling inlets, the area becomes a space for expression as well as for integration of existing and new functionalities.

    OEM’s are striving to combine elements at a front end, a front central area is being combined with other components such as headlights or even a bumper, but it can also only connects far left and right sides of a vehicle. The integration of additional functions such as radar, camera and other devices is also common. Therefore, it is worth to highlighting a growing size of products, a desire for additional functionalities and to add a demand for a high level of decorative effects.

    In addition to requirements in vehicle front end area, the article also presents technologies which implementation is essential to fulfill the requirements of customers. Besides well-known ones, such as injection molding, lacquering, metallization, etc., attention is focused on technologies such as compression injection molding, in-mold lacquering, foil injection molding, laser removal and other.
  • Get rid of issues during molding process by using new dimension of mold temperature managementCem Baris Özgüven, Contura-MTC GmbH


    Basically , Every mold is a heat exchanger. Efficiency or capability of heat exchangers mostly depend on engineering design on injection mold. Quality and cost efficiency in the plastic injection process depends significantly on the heat transfer quality between the mold surface and the molten material. Therefore, an optimum temperature profile on the mold surface is needed to achieve low cycle time and high part quality.
    Cooling time is inefficient / lost time in the plastic injection process, so a small improvement in cooling time will directly increase efficiency. Conventionally designed cooling channels prevent using this potential, resulting in long cycle times and low part quality. But CONTURA® MTC technology overcomes all these limitations of conventional cooling. With CONTURA® MTC technology, the cycle time decreases by an average of 30%, and the following properties are also improved thanks to the optimum temperature profile provided on the mold surface.
    As CONTURA® MTC which is a solution company offers you the best possible service related to temperature control optimisation of the injection mould. Even highly complex components can be realised with CONTURA® MTC as a leading company in the development of contoured temperature control concepts.
    With CONTURA® MTC Conformal Cooling Inserts are cruical for a lot of advantages.
    These are:
    - Cycle Time Reduction
    - Better Dimensional Stability (Less Warpage)
    - Better Mechanical Properties for All-Part
    As well as Contura provide Key Solution for Rapid Heat & Cool (Variotherm) Process Including Mold inserts and Variotherm Device.
    What can be reason of using Rapid Heat & Cool?
    - Paint Elimination
    - Better Optical Results for Lens Parts
    - Weldline Elimination
    - Better Mechanical Properties for Technical Parts

    Meet CONTURA® MTC and enter new dimension of mold temperature management!
  • IceJet technology: challenges and opportunities for Slovenian machine building industryJoško Valentinčič, Fakulteta za strojništvo, UL


    Marko Jerman, Fakulteta za strojništvo, UL
    Andrej Lebar, Fakulteta za strojništvo, UL
    Izidor Sabotin, Fakulteta za strojništvo, UL
    Suzana Vinetič, Fakulteta za strojništvo, UL
    Pavel Drešar, Fakulteta za strojništvo, UL

    The advantage of Abrasive water jet (AWJ) machining over related processes is that no heat-affected zone is created. The AWJ technology has been available in Slovenia since 1990, only 10 years after the first industrial use of this contour cutting process. The mineral abrasive, which is fed to a high-speed water jet with a diameter of less than one millimeter, reaches speeds of up to 700 m/s and allows practically any material to be cut. Despite the obvious advantages, the use of the process in the food and aerospace industries is unacceptable since the traces of mineral abrasive particles remain on the treated surface. Investigations into the material properties of ice have shown that heavily cooled ice grains have a similar hardness to softer mineral abrasives, so we are researching and developing a technology that uses ice grains instead of mineral abrasives. A cooled high-speed water jet delivers highly cooled ice grains to to the cutting front to cut hard materials. Recent research has confirmed the survival of ice beads under the extreme conditions of the cutting head. On the basis of our results and publications to date, we have aroused the interest of industry both in the EU and Asia that already shows the need for this technology and thus opens up new opportunities for the Slovenian machine buliding industry.
  • Increasing Competitiveness in High Pressure Die Casting with Additive ManufacturingArmin Wiedenegger, voestalpine Additive Manufcaturing Center GmbH


    Günther Prunner, voestalpine High Performance Metals International GmbH
    Boštjan Notar, voestalpine d.o.o., Slovenia

    In a cost-intensive process, such as high pressure aluminum die casting, reducing the cycle time and scrap rate has a significant influence on profitability. By using advanced conformal cooling design and state-of-the-art BÖHLER hot work tool steels, the cycle time for molding tools can be reduced and tool life can be increased. This means that not only the component quality in functional areas increases, but also the overall process quality. These innovative solutions can only be realized if the restrictions of additive manufacturing (AM) are understood. Only then can the potential of AM be exploited to develop novel tool concepts from a holistic understanding of component and process requirements. Thermal management then becomes the focus of the entire process chain. In addition to an increasing component quality, the optimization of thermal management leads to significant cost savings and thus to an increase in the competitiveness of this production process. Likewise, AM tools also contribute to the reduction of energy consumption and hence CO2 emissions which will play an ever increasing role in future (automotive) production processes.
  • Industry 4.0 Readiness Index for manufacturing companiesIztok Palčič, Univerza v Mariboru, Fakulteta za strojništvo


    Robert Ojsteršek, Univerza v Mariboru, Fakulteta za strojništvo
    Borut Buchmeister, Univerza v Mariboru, Fakulteta za strojništvo

    Laboratory for Production and Operations Management from Faculty of Mechanical Engineering from Maribor has been cooperating for 17 years within the largest European research from the field of manufacturing activities – European Manufacturing Survey. Project coordinator is the Fraunhofer Institute for Systems and Innovation Research – ISI from Germany. Project consists of 17 partners from among others Austria, Swiss, Spain, Croatia, Serbia, Denmark etc. Slovenia joined the project in 2003 with the first survey. After that, we have performed our survey in 2006, 2009, 2012/13, 2015/16 and 2018/19. The survey is very useful for Slovenian manufacturing companies as it enables comparisons to other countries. The aim of the survey is to present the results to companies and wider audience. This paper deals with the use of advanced manufacturing technologies in Slovenian manufacturing companies in the light of Industry 4.0. We present Industry 4.0 readiness index and assess the readiness of Slovenian manufacturing companies. The results in Slovenia are compared to situation in Austrian manufacturing companies.
  • Innovative development and production of complex progressive tool for serial production of high-strength sheet metal products with integrated thread rollingMarko Klinc, Gorenje Orodjarna d.o.o.


    Innovative approaches in the development of the tool have made it possible to produce tool that is more productive in comparison with the previous ones and enables the automatic production of stamped parts. The consumed material per unit of stamped parts is by 38% lower. The core of the challenge was the manufacturing of \"necks\" by rolling of threads in the tool, because the high strength sheet metal was used. Stamped parts are defined as safety parts in the car, which further increases the complexity of the project.
  • New technologies in the field of plastic injection moldingMatija Obolnar, Hella Saturnus Slovenija d.o.o.


    Automotive industry trends often represent a serious challenge to plastic component suppliers. There are increasing demands on products of large dimensions and complex shapes, all this beyond the limit of feasible by utilizing technologies considered as classical within the industry of this kind.

    As mentioned, injection molded products are becoming large, often of variable thicknesses and complex shapes. In addition, there are also high demands on various decorative effects. Besides the challenges at a molding stage, the size and complexity of the products also pose a challenge at further production steps. Finally, it is necessary to point out the economical aspect, despite all mentioned there is still a tendency to rapid and economical production.

    The paper presents new technologies in processing of plastic needed to overcome above described challenges. Two of these are injection compression molding and foil injection molding. The first one allows to produce products of larger dimensions while by the second one more complex effects, visual and functional, are achievable. In both cases, it makes sense, or it is even necessary to implement a cascade injection with controlled valve gate systems. When talking about the economical aspect of the process, the article also touches a rapid heating/cooling system and a \"family tool\" system.
  • Optical measurement in serial productionDamir Karic, odelo d.o.o.


    In presentation is shown usage and result of optical measurement in Odelo d.o.o.. First plan with Atos Triple Scan II was to control soft components, becouse other methods wasn´t useable. Optical measurement gave us measuring result of gasket and additional information of warpage on complete part.
    Tool measurement is now more simple becouse of the mobile scanner.
    After good practice we decide to invest in Atos ScanBox 5120 which help us to shorten the moulding machine settings. We also simplified measurement and improve measuring reports with color deviation.
  • Optimization of injection moulding of POM using Flash DSC methodRebeka Lorber, Fakulteta za tehnologijo polimerov


    Gašper Bergant, Polycom Škofja Loka d.o.o.
    Silvester Bolka, Fakulteta za tehnologijo polimerov
    Miroslav Huskić, Fakulteta za tehnologijo polimerov
    Blaž Nardin, Fakulteta za tehnologijo polimerov

    When considering the injection moulding of semi-crystalline thermoplastics, mould temperature with cooling rate and cooling time are among the most important parameters that determine the size and amount of crystalline domains, which significantly affect the final properties of the injection molded parts, especially in terms of mechanical properties and geometric stability.
    The Flash DSC method allows heating and cooling of samples of polymeric materials at high heating (2,400,000 °C/min) and cooling rates (240,000 °C/min). The method works on the principle of calorimetry and allows the determination of the glass transition temperature, melting point, crystallization and cold crystallization as well as the corresponding enthalpies. The measurements can be performed in the temperature range between -35 °C and 300 °C using samples with a mass between 10 ng and 1000 ng.
    In this paper, we present the optimization of injection moulding of POM using Flash DSC method and its practical application using injection moulded gears as an example. The influence of mould temperature and cooling time on the degree of crystallinity of POM Delrin 100 NC010 was investigated and optimized. As a function of mould temperature and cooling time, the relative degrees of crystallinity were determined, which can be used to determine the most optimal combination of cooling time and mould temperature for injection moulding.
  • Polycarbonate recyclingBlaž Nardin, Fakulteta za tehnologijo polimerov


    In this paper the introduction of the recycling of an engineering thermoplastic material with short lifetime of the products for which multiple mechanical recycling is desirable will be presented. Commercially available grades are either in linear or branched form, so both qualities were tested and compared.
    The aim of the research was to characterize the thermal, mechanical and optical properties of the polycarbonate (PC) in linear and branched qualities depending on the number of processing operations. Degradation can also be avoided to a good extent with the right additives, so two different concentrations of chain extender were added. The processing was simulated by repeated extrusion. Test pieces were prepared by injection moulding after repeated multiple extrusions. It has been observed that individual properties are linearly dependent on the number of recycling runs (color tone), and some of the properties do not exhibit linear dependencies (tensile strength in branched PC). Properties depend to a large extent on the amount of chain extender added in the linear PC form, and in the branched PC form this dependence is more difficult to detect. For some linear and branched PC, some properties are inverse with respect to the number of recycling runs, so it is very important for a recycled PC the ratio between linear and branched quality. With proper up-cycling, it is possible to produce recycled PC with the right characteristics for a given product, if the properties of the recycled PC are known in advance.
  • Post-processing results of computer tomography with GOM inspect softwareTomaž Brajlih, Univerza v Mariboru/Fakulteta za strojništvo


    Paper present possibilities of using GOM inspect software for postprocessing medical 3D CAD models. Three-dimensional reconstruction of medical exams has become an essential part of modelling and manufacturing patient specific medical devices. In case of large skull defects, patient specific implant modelling and manufacturing has already been established world-wide. Modelling of such an implant is based on 3D CAD model of patient’s bone tissue that is acquired from computer tomography medical exam. Three-dimensional reconstruction of DICOM results in performed by dedicated medical imaging software by processing spatially oriented greyscale pictures of patient’s cross-sections. Bone tissue model is acquired by image segmentation based on selected range of grayscale values. Due to examination slice thickness and image pixel sizes there is a significant staircase effect on the acquired 3D model. Next step is to smooth the model surface and reduce the number of mesh triangles in order to obtain a useably 3D model for implant modelling. Paper present the functionality of GOM inspect software for such a process.
  • Smart and secure distribution of applications and contents in production environmentsPeter Skopec, ControlTech d.o.o.


    Jože Perko, ControlTech d.o.o.

    ThinManager is an advanced solution that enables easy, secure and reliable distribution of applications and content to any device. Given the different criteria (user, device, location…), it provides the right content to the right person in the right place.
    An advantage of the ThinManger solution is the server-client system. Unlike traditional, maintenance-intensive approaches, ThinManager is a centralized solution where the operating system, antivirus programs and all user applications and tools run only on the server and only Thin Client are installed on all remote locations throughout the factory. They do not have a hard drive, they do not need their own operating system and all other applications, as they are all provided by a server, which sends them everything necessary to display the assigned content via the secure network connection. The content can be any application (eg. SAP, Microsoft tools, a design or programming tool or it can be a video camera display on a specific production process). This solution allows full customization of content according to the user and his role in the process.
    In case of a client failure the downtime is greatly reduced. This centralized solution improves the reliability and availability of the system by replacing the client in just few minutes, and a completely redundant configuration is possible.
  • Smart LubricationGregor Podobnik, ABC Maziva d.o.o.


    Article is focused on lubrication management costs in modern plant. Cloud based application for lubrication management is latest step for managing maintenance costs.
  • Thermoplastic composites with high thermal conductivityTeja Pešl, Fakulteta za tehnologijo polimerov


    Silvester Bolka, Fakulteta za tehnologijo polimerov
    Rebeka Lorber, Fakulteta za tehnologijo polimerov
    Tamara Rozman, Fakulteta za tehnologijo polimerov
    Rajko Bobovnik, Fakulteta za tehnologijo polimerov
    Blaž Nardin, Fakulteta za tehnologijo polimerov

    In this paper, thermal conductivity in combination with mechanical properties of polymer composites is presented. The polymer composite material consists of a polycarobnate (PC) thermoplastic matrix to which boron nitride (BN) is added to increase the thermal conductivity. Different combinations of thermal conductivity and mechanical properties are achieved using different compatibilizers in the ternary composite blends.
    Compounding was carried out on a twin screw extruder. We added 50 % BN and 5 % of different compatibilizers to the PC matrix. To perform the characterization, the test specimens were prepared by injection molding. Flexural modulus, flexural strength, flexural strain at flexural strength, thermal conductivity and temperature of degradation are strongly dependent on the compatibilizer used. With high flexural stiffness we also get the highest flexural strength, at the same time this composite is the most brittle and has the highest thermal conductivity. The toughest composite is obtained at medium values of flexural stiffness and strength, at the same time the thermal conductivity is the lowest.
    The work was carried out within the project PolyMetal - Interreg SLO-AT, a priority axis for strengthening cross-border competitiveness, research and innovation, in which we develop cost-effective polymer materials with metallic look and feel. Participating partners from Slovenia are FTPO, Gorenje d.o.o. and Intra lighting d.o.o..
  • Trends for manufacturing of car body partsAleš Adamlje, Hella saturnus Slovenija d.o.o.


    Pavel Oblak, Hella Saturnus Slovenija d.o.o.

    Car body parts determine the appearance of a vehicle, they make them unique and recognizable. The shape is becoming bolder, thus narrowing the choice of possible technologies to produce body parts. With accelerated development of electric vehicles, body parts made of low-density materials, recyclable materials or materials which can contribute to weight reduction at same or even better mechanical properties are strongly gaining in importance. In order to reduce the costs and maintaining the competitiveness of OEM\'s on the global market, there is an increasing number of demands on multifunctional parts, which reduces the number of car body elements. The article will present the development trends of decorative car body parts made of polymeric materials and composites, which are replacing other materials classical used. Relatively simple processing, a possibility of demanding free-form design shapes, integration of special geometries or additional elements brings advantages and at the same time new challenges in the field of development and industrialization.
  • UNIOR follows the trends of electro-mobility and automation in the automotive industryBogdan Kukovič, Unior Strojegradnja


    Ken Patrik Leskovar, Unior Strojegradnja

    Global trends and political and environmental pressures are increasingly in favour of electro-mobility. To keep pace with these trends, the automotive industry is embarking on a radical change that will shape developments in the decades to come. As a long-established manufacturer of specialised machinery, primarily for OEMs and Tier 1 manufacturers in the automotive industry, Unior Machinebuilding is adapting quickly and successfully to the new challenges and needs of a rapidly evolving market.

    Electric mobility is disrupting the automotive engineering market as electric vehicles are built with fewer moving components compared to internal combustion engine vehicles, and new components are emerging for which new technological solutions and manufacturing processes need to be developed.
    In order to keep up with these trends, rapid adaptation and the development of optimal solutions are key in mechanical engineering. Unior Machine Building is therefore adding machines for machining battery housings, twin-spindle machining centres for large-size pieces and universal machining centres to its existing range of deep-drilling machines and special-purpose machine tools.

    In parallel with the machine range, Unior is expanding its automation and assembly machine offerings, which were previously only offered as part of our Turn-Key solutions for our machines. With our partial or full automation, we provide optimum workpiece handling solutions to ensure greater efficiency of production processes, increased reliability of operation and a reduction in the cost of the workpiece produced.
    We offer the following automation solutions:
    - Robotic bin-picking of small and medium unsorted workpieces,
    - Pick-up of pieces from vibrating units or conveyor belts
    - NC machine tool and other production processes
    - Carrying out workpiece conveyors with different conveyor systems
    - Integration of different production processes into the conveyor system (washing, blowing out, laser recording of pieces, inspection and measurement of workpieces with camera or contact,...
    - Assembly lines with force control and measurement systems,...
    - Robotic deburring, etc.
  • Waste biomass as a reinforcement for thermoplastic elastomerSilvester Bolka, Fakulteta za tehnologijo polimerov


    Teja Pešl, Fakulteta za tehnologijo polimerov
    Rebeka Lorber, Fakulteta za tehnologijo polimerov
    Tamara Rozman, Fakulteta za tehnologijo polimerov
    Rajko Bobovnik, Fakulteta za tehnologijo polimerov
    Blaž Nardin, Fakulteta za tehnologijo polimerov

    The goal of the development of a thermoplastic elastomer bio-composite was to offer the market a flexible composite with as high bio-based components as possible. This was achieved by using polyethylene high density, which was synthesized from sugar cane and waste biomass as reinforcing additive.

    In this paper, we present a bio-composite with waste biomass and a thermoplastic elastomer matrix, which is designed for outdoor applications and will be first used to make prototypes of handles for hiking or walking or ski poles. The influence of different amount of waste biomass in the bio-composites and the influence of different quantity of the added PE-HD component were tested. In protoyping the influence of different Masterbatch additives on the colour change was also addressed and investigated. Prototypes were injection moulded at the company Tehnomat d.o.o, which is a world-renowned manufacturer of handles for hiking, walking and ski poles. The characterization of the properties was performed in the laboratories of the Faculty of Polymer Technology. Mechanical and thermal properties and dynamic mechanical properties were evaluated.
    The authors would like to acknowledge the financial support received in the frame of the Slovenian smart specialization program (CEL.CYCLE - http://celkrog.si/?lang=en, grant number C3330-16-529004).