- TITLE:
APPLICATION OF FRACTIONAL FACTORIAL DESIGN FOR ANALYSIS OF CUTTING ENERGY IN TURNING
- AUTHOR(S):
M. Trifunović, M. Madić
- ABSTRACT:
Energy consumption in machining processes is a very important aspect that has been given increased importance in recent times. This article, therefore, proposes an approach for identification of the most important main and interaction effects of turning parameters regarding the cutting energy in dry longitudinal single-pass turning of low-alloyed and high-alloyed steels. Fractional factorial design was applied to arrange five parameters, namely, depth of cut, feed rate, cutting speed, rake angle and cutting edge angle at two levels. Based on the cutting tool manufacturer�s machining calculator and well-known analytical relationships, cutting energy was estimated for sixteen cutting regimes for both workpiece material groups. The analysis of obtained results involved the analysis of main and interaction effects, determination of statistically significant effects and development of cutting energy prediction models.
- DOI:
https://doi.org/10.62853/TOOK2098
- PAGES:
46-50
- HOW TO CITE THIS ARTICLE:
Trifunović M., Madić M. Application of fractional factorial design for analysis of cutting energy in turning. Journal of the Technical University of Gabrovo 65 (2022) 46-50
- 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
- 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
- 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
- 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
- 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
