Modern Machinery (MM) Science Journal, June 2018

QUALITY OF 3D PRINTED SURFACE BASED ON SELECTED POST PROCESSOR

JOZEF TOROK, MAREK KOCISKO, MONIKA TELISKOVA, JAROSLAV PETRUS, DUSAN PAULISIN
Keywords: comparison | Slic3r | Skeinforge | Cura Engine

Thanks to the open source project RepRap the 3D printing technology has been delivered from laboratories to normal households. Since the beginning of the project, 3D printing has been constantly gaining in popularity thanks to the relatively simplicity in the production or transformation of ideas into physical models. In addition to the choice of hardware for open-source 3D printer an important factor d (…)

CONFIGURATION ON HYBRID PLATING TO IMPROVE INTERNAL FIXATION ON FEMUR BONE MODEL

NAFISAH ARINA HIDAYATI, MOCH. AGUS CHOIRON, SOFYAN ARIEF SETYABUDI
Keywords: bone screw | internal fixation | locking compression plate | stress | configuration | hybrid plating | Femur fracture

This study presents a stress analysis of hybrid plating constructions on femur fracture. The bone screw mounting configurations have successfully modeled with ANSYS Multiphysics/LS-Dyna v.18.1. The bone model was achieved from the CT-scanning of the human femur bone. The interactions between femur bone and hybrid plating were observed. Locking compression plates with 8 holes for bone screws were used. A (…)

ICE JET TECHNOLOGY

MARKO JERMAN, ANDREJ LEBAR, IZIDOR SABOTIN, PAVEL DRESAR, JOSKO VALENTINCIC
Keywords: ice particles | cryogenic gas | ice abrasive | IceJet | IAWJ machining

Ice jet technology also known as ice abrasive water jet (IAWJ) is a prototype technology currently under development. In IAWJ technology ice particles made from water are used instead of mineral abrasive. The aim is to increase the productivity of pure water jet (WJ) while keeping its advantages, producing no other waste product but water. Technology has great potential to be used in food and medical in (…)

PRODUCTION ENHANCEMENT THROUGH USING A CONTINUOUS SYSTEM OF WINDING ELECTRIC MACHINES

LADISLAV FUGLICEK
Keywords: winding | operating tests | voltage | stator coil | insulation

The article is focused on the practical test of stator coil isolation by a continuous winding system. The winding system has two types. Discontinuous winding requires precise manual winding of the material. Discontinuous winding is time consuming. The use of the winding machine is limited by a maximum voltage of 11 kV. With continuous winding, the machine winding is accurate, the winding time is lower a (…)

APPLICATION OF WATER JET TECHNOLOGY FOR CONCRETE REPAIR

LENKA BODNAROVA, LIBOR SITEK, JOSEF FOLDYNA, TOMAS JAROLIM, RUDOLF HELA
Keywords: tensile strength | micro cracks | X-ray computer tomography (X-ray CT) | concrete repair | concrete | Water jet (WJ)

This article brings selected knowledge from the long-term cooperation between the Brno University of Technology, the Faculty of Civil Engineering, the Institute of Technology of Building Materials and Components, and the Academy of Sciences of the Czech Republic, v.v.i., Institute of Geonics, Ostrava – Poruba in the field of the interaction of water jets and concrete, especially with regard to the use o (…)

MANUFACTURING METHOD OF SPIRAL BEVEL GEARS BASED ON CAD/CAM AND 3-AXIS MACHINING CENTER

NGUYEN VAN TUONG
Keywords: optical scanner | end mill | 3-axis machining centre | gear manufacturing | spiral bevel gear | CAD/CAM

Spiral bevel gears have been traditionally machined on special machines commonly known as Gleason, Oerlikon, or Klingelnerg. One of disadvantages of the traditional method is high cost. This paper presents a practical method based on CAD/CAM and 3-axis CNC machining to manufacture spiral bevel gears of the Gleason design. This method can be considered as an alternative method to the traditional methods. (…)

THE GENERATION OF ROBOT EFFECTOR TRAJECTORY AVOIDING OBSTACLES

MARTIN KOMAK, MARIAN KRALIK, VLADIMIR JERZ
Keywords: robot effector | optimization | Industrial Robot | trajectory planning | obstacle avoiding

This paper discusses the problem of trajectory planning for robotic manipulators at minimal cost. The paper deals with problems of obstacle avoidance during the manipulation and technological activities of the industrial robot. A system has been designed to find a trajectory that is both collision-free and of minimal distance. The goal is to reduce workplace costs with the robot and thus increase the ef (…)

THE INFLUENCE OF CUTTING PARAMETERS ON SURFACE QUALITY AND NITROGEN CONSUMPTION DURING LASER CUTTING

VACLAV MUSIL, MAREK SADILEK, ROBERT CEP, SARKA MALOTOVA
Keywords: process fluid pressure | nozzle diameter | consumption of process medium | laser cutting

Unconventional machining methods, or also progressive machining methods, such as laser cutting, waterjet cutting, ultrasound machining, etc. are undergoing a very rapid development. Laser cutting machines often evaluate even 80 parameters in real time. Their advantage is the significantly higher productivity. Many values are defined by the machine manufacturer and can not be changed for a given laser. F (…)

THE INFLUENCE OF THE NETWORK DENSITY ON THE CREEP MODULUS OF RADIATION CROSSLINKED MATERIALS

MARTIN REZNICEK, MICHAL STANEK, LENKA HYLOVA, DAVID MANAS
Keywords: time | modulus | tensile – creep modulus | crosslinked | creep | polyethylene

This article deals with the creep modulus process comparison of two structurally different materials. These are specific materials HDPE (high density polyethylene) and LDPE (low density polyethylene). These materials were chosen because of their shared monomer from which they were created and differ only in the chain shape. Subsequently these materials were beta radiation crosslinked at six various dose (…)

EFFECT OF STRUCTURAL PARAMETERS ON TEMPERATURE DISTRIBUTION OF ORGANIC LIGHT EMITTING DIODE PANELS

TOSHIRO KOBAYASHI, TAIZO UCHIDA, YUICHI UTSUMI, HIDEYUKI KANEMATSU, TSUYOSHI MASUDA
Keywords: heat transfer | design of experiment | FEM | temperature | organic LED | OLED

This paper describes the temperature distribution of an organic light emitting diode (OLED) panel calculated by a finite element method (FEM) and measured. Organic LEDs (OLEDs or organic electro luminescence) are examples of solid-state lighting (SSL) that have been rapidly developed and applied in many practical fields owing to their high efficiency and on mercury-free operation. However, energy is los (…)

SOLAR ABSORBERS WITH A STRUCTURED SURFACE

JAN RIHACEK, MARTIN SARBORT, PETR HORNIK, LIBOR MRNA
Keywords: LS-DYNA | ANSYS | Matlab | X5CrNi18-10 steel | hydroforming | numeric simulation | solar absorber

The article deals with the issue of a new type of solar absorbers, which have a direct flow structure and a structured surface, which consists of pyramidal cavities. This solution increases a thermal efficiency. In the first part, possible parameters that affect the thermal efficiency of solar collectors are described and further, a simulation of a dependence of a resulting absorption coefficient at a p (…)

CORROSION CHARACTERIZATION OF ANODIZED AA 6061

PUTU HADI SETYARINI, RUDY SOENOKO, YUDY SURYA IRAWAN, - PURNOMO
Keywords: AA 6061 | anodizing | corrosion resistance | potential | surface topography

In this study we examined the effect of topography and corrosion resistance of aluminum alloy 6061 which has been anodized on a mixture of phosphoric acid and oxalic acid by using titanium cathode. Surface topography was tested with the N8 NEOS Bruker, corrosion testing performed by Tafel method using a potentiostat Autolab (PGSTAT302N), while testing the immersed test to determine the condition of the (…)

TRIBOLOGICAL PROPERTIES OF AL-ALLOY DESIGNED FOR DRAWING STAMPINGS IN AUTOMOTIVE INDUSTRY

PAVEL SOLFRONK, JIRI SOBOTKA, DAVID KORECEK, MICHAELA KOLNEROVA
Keywords: Friction Coefficient | 3D Surface Color Map | Car-body | Drawing of Sheets | tribology | Al-alloys

Strict legislative requirements for environmental protection and tendency to lower consumption of fossil fuels force the car producers to still find new possibilities in the car-body design. As one of such possibilities there is effort to apply materials with low specific weight. Among these belong also Al-alloys that are affordable, but in comparison to steels also difficult to be technologically proce (…)

APPROACHES TO THE EVALUATION OF WORKSHOP MICROCLIMATE CONDITIONS

RUZENA KRALIKOVA, FRANTISEK KOBLASA
Keywords: questionary survey | measurement | environment | microclimate | Thermal comfort

The article deals with the evaluation of microclimate conditions at the workplaces of the engineering workshops. By measuring the conditions of the thermo-humidity parameters, these were objectified and compared with the results of the subjective evaluation, obtained by the questionnaire survey. Based on investigators' research up to the present day, these outputs are not always consistent, and therefor (…)