- TITLE:
SOFT PVC COMPOUNDING EXTRUDER DESIGN
- AUTHOR(S):
B. Avci, I. S. Dalmis, S. O. Yilmaz
- ABSTRACT:
Polyvinyl chloride (PVC) is one of the most preferred thermoplastics in the world due to its compatibility with various additives. PVC products are examined in two groups soft and rigid. Sheath, insulation, and filling materials used in electrical cables are some of the common usage areas of soft PVC. In this study, a soft PVC compound extruder machine was designed and manufactured. The system consists of 6 components: powder feeding system, main rotor, discharge transfer screw system, pelletizer, pellet cooling (cooler) unit and main control panel (HMI). In the designed and produced machine, the temperature values can be entered into the HMI panel according to the desired formulation, and the temperatures of the desired sections can be controlled during the compound production using thermocouples. Heating is brought to the desired level using PID control with resistances, cooling with fans in the main screw area and water in the transfer area. During the compound production process, many values such as temperature and pressure values can be controlled from the material feeding section to the pelletizer section. The density of the soft PVC compound produced was measured as 1.475 gr/cm3. The test sample was produced from PVC compound, which was produced via the compounder designed and manufactured in this study, with a laboratory-type extruder. Tensile and elongation tests were carried out according to the ISO 527-2 test method. As a result of the test, it was observed that produced soft PVC compound extended by 280%. As a result of the experiments, it has been determined that the designed and manufactured compounder machine produces the sheath, insulation and filling materials (Plasticized PVC) used in the electrical cables appropriately.
- DOI:
https://doi.org/10.62853/KLGM8197
- PAGES:
41-45
- DOWNLOAD:
SOFT PVC COMPOUNDING EXTRUDER DESIGN
- HOW TO CITE THIS ARTICLE:
Avci B., Dalmis I.S., Yilmaz S.O. Soft PVC compounding extruder design. Journal of the Technical University of Gabrovo 65 (2022) 41-45
- TITLE:
EFFECTS OF MACHINING PARAMETERS ON TOOL LIFE
- AUTHOR(S):
Ö. Ayer, B. Çolakoglu
- ABSTRACT:
Cutting tools, which are used extensively in machining, are expected to have high performance and longer service life. Tool life term defines the time period between the starting of the cutting tool and the sharpening of the tool so that the tool is actively used. According to international standards, tool deterioration by wear is a specific criterion used to determine tool life. In this study, the effects of cutting parameters on the cutting performance and tool life of standard end mills with diameters Ø6, Ø8, Ø10, Ø12 which are used extensively in the die-making industry, were investigated. Detection of cutting-edge wear conditions was achieved by conducting detailed surface observations with a high-resolution camera of a three-dimensional (3D) digital microscope.
- DOI:
https://doi.org/10.62853/KPOS6096
- PAGES:
38-40
- DOWNLOAD:
EFFECTS OF MACHINING PARAMETERS ON TOOL LIFE
- HOW TO CITE THIS ARTICLE:
Ayer O., Colakoglu B. Effect of machining parameters on tool life. Journal of the Technical University of Gabrovo 65 (2022) 38-40
- TITLE:
A PROTOTYPE CHARPY AND IZOD IMPACT TESTER DESIGN AND IMPACT TEST ANALYSIS OF DIFFERENT ALUMINUM ALLOYS
- AUTHOR(S):
M. Unal, I. Savas Dalmis
- ABSTRACT:
Different international standards have been established to determine the fracture energy of materials. In this study to determine the fracture energies of aluminum materials in different alloys, a prototype of Charpy and Izod impact tester was designed and manufactured. This tester were been designed and manufactured by ASTM E23 and TS EN ISO 148-1 standard. This study was completed during the postgraduate period. The Charpy and Izod impact energies of ETIAL-160, ETIAL 171, ETIAL 177, ETIAL 195, and AC2A which are aluminum materials commonly used in the manufacturing industry, were determined by the designed machine.
- DOI:
https://doi.org/10.62853/DOTY3194
- PAGES:
32-37
- DOWNLOAD:
A PROTOTYPE CHARPY AND IZOD IMPACT TESTER DESIGN AND IMPACT TEST ANALYSIS OF DIFFERENT ALUMINUM ALLOYS
- HOW TO CITE THIS ARTICLE:
Unal M., Savas Dalmis I. A prototype Charpy and Izod impact tester design and impact test analysis of different aluminum alloys. Journal of the Technical University of Gabrovo 65 (2022) 32-37
- TITLE:
CURRENT STATUS AND DEVELOPMENT PROSPECTS OF MOTOR-SPINDLES FOR MACHINE TOOLS
- AUTHOR(S):
Y. Kuznietsov, Ľ. Šooš, V. Shynkarenko, O. Shevchenko, O. Yurchyshyn, A. Shymanska, V
- ABSTRACT:
The materials of the article show the global trend for high-speed processing on machine tools, which consists in the transition from multi-link drives of the main rotary movement to a single-link drive, where the spindle unit of the machine tool is made in the form of a motor-spindle, the stator of which is the body of the spindle unit, and the rotor is the spindle. Currently, self-acting motor-spindles that perform rotational and longitudinal forming movements are not manufactured. It was possible to combine these movements in the motor-spindle design thanks to the universal genetic crossing operator, which made it possible to move to hybrid systems, which became the object of this research.
- DOI:
https://doi.org/10.62853/KEQB3628
- PAGES:
28-31
- DOWNLOAD:
CURRENT STATUS AND DEVELOPMENT PROSPECTS OF MOTOR-SPINDLES FOR MACHINE TOOLS
- HOW TO CITE THIS ARTICLE:
Kuznietsov Y., Šooš L., Shynkarenko V., Shevchenko O., Yurchyshyn O., Shymanska A., Kotlyarova V. Current status and development prospects of motor-spindles for machine tools. Journal of the Technical University of Gabrovo 65 (2022) 28-31
- TITLE:
EVALUATION OF FACTORS AFFECTING THE UNSTABILIZED FLOW OF ELECTRICALLY CONDUCTIVE LIQUIDS
- AUTHOR(S):
A. Mamedov, A. Murashchenko, O. Yakhno
- ABSTRACT:
This article is dedicated to influence of a transverse magnetic field is determined by the action of the so-called ponderomotive forces, which has magnetic nature. Such an impact makes it possible to evaluate the characteristics of the flow in the hydrodynamic initial section, pressure losses and determine the length of the initial section itself. It is shown that in some cases the action of a magnetic field leads to a change in the rheological properties of a viscous liquid. The article presents the processing of experimental data, thanks to the planning of experimental data carried out according to the appropriate methodology. The presented form, the characteristics of the velocity field were obtained for various values of the Reynolds number and the Hartmann number. It is also shown that in the case under consideration, the length of the hydrodynamic initial section is a function of the Reynolds number and the Hartmann number.
- DOI:
https://doi.org/10.62853/QXLL5959
- PAGES:
24-27
- DOWNLOAD:
EVALUATION OF FACTORS AFFECTING THE UNSTABILIZED FLOW OF ELECTRICALLY CONDUCTIVE LIQUIDS
- HOW TO CITE THIS ARTICLE:
Mamedov A., Murashchenko A., Yakhno O. Evaluation of factors affecting the unstabilized flow of electrically conductive liquids. Journal of the Technical University of Gabrovo 65 (2022) 24-27
