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1
Content available Options for solutions of the inlet system into the mold
Ružbarský Juraj, Krenický Tibor, Maščeník Jozef, Coranič Tomáš
Systemy Wspomagania w Inżynierii Produkcji
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2023
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Vol. 12, iss. 2
57--70
EN
The presented contribution points out the possibilities of solving the inlet system, as one of the important factors influencing the final quality of the castings. Due to its design and function, the sprue system influences the process of filling the mold cavity. With the correct design of the sprue system, we achieve the continuity of filling the mold cavity and the elimination of qualitative and quantitative errors caused by non-observance of basic principles in the design of sprue systems. When conducting the experiments, we monitored the mold inlet system, modeling the process of filling the mold cavity and the speed of the liquid metal in the notch and the mold cavity. The results of the experiments show that the speed of the liquid metal when filling the mold is approximately half of the calculated theoretical value.
2
Content available Design of self-leveling table for FFF additive technology
Coranič Tomáš, Ružbarský Juraj, Krenický Tibor, Maščeník Jozef
Systemy Wspomagania w Inżynierii Produkcji
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2023
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Vol. 12, iss. 2
109--117
EN
The presented paper describes the conceptual design of a worktable intended mainly for use in combination with FFF additive technologies, calibrated using a gyroscope and accelerometer. The proposed system is based on a programmable Arduino platform that operates with three digital servomotors and a mechanical gyroscope. In the introduction, the theoretical assumptions, and definitions of basic concepts such as a gyroscope, electric motor, and RC servomotor are described. Subsequently, the contribution is devoted to the selection of suitable components, the schematic connection, and the design itself in the Autodesk Inventor program. In the conclusion, the anticipated benefits of using the technical solution when applied in FFF additive technologies are described.
3
Content available Technical diagnostics of industrial double twist twinner machine for data cables
Krenický Tibor, Ružbarský Juraj, Coranič Tomáš, Maščeník Jozef
Systemy Wspomagania w Inżynierii Produkcji
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2022
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Vol. 11, iss. 2
35--46
EN
The presented article focuses on the diagnostic measurement and evaluation of vibrations of equipment used for data-cable twisted pairing manufacture. A short description of the process of the data cables manufacturing process to which the diagnosed device belongs is provided and the qualitative parameters of the data cables are mentioned. The experimental part is devoted to the experimental diagnostics of the given system in order to locate and identify the possible reason for the occurrence of the parameter´s critical value of the loss of the data cable. When deterioration of electric properties was detected, monitoring the basic oscillation characteristics has been deployed as the key tool to detecting damaged machine parts, and avoiding quality deterioration of the products in the manufacturing process. Finally, the quality of the paired cables after the repair has been confirmed by measurements verifying the efficiency of the measures performed.
4
Content available New concept of software for calculation of chain gears
Maščeník Jozef, Coranič Tomáš, Krenický Tibor, Ružbarský Juraj
Systemy Wspomagania w Inżynierii Produkcji
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2022
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Vol. 11, iss. 2
47--56
EN
At present, practically all areas of design activities are supported by computer technology, which can be effectively used in the design of gears, belts and chain transmissions, especially in the field of calculations, as well as graphics solutions. However, their use requires mastering the basic principles of computational procedures contained in the programs in question and, on that basis, critically evaluating computer-generated solutions. The presented paper deals with the design proposal and application of program for calculation and check of chain gears. Although there are currently various programs on the market that can design chain transmissions and perform strength analysis, there is still space for improvement and the creation of these programs. The computing program has been created as a spreadsheet in the working environment of the Microsoft Office program by the Excel application through defined sequences of the individual commands. The program serves for design proposal of a chain drive by means of inserted databases, graphs and tables. In the process of designing and checking the input values are entered such as performance, rotations, and number of wheels. Through calculation the software generates speed of a chain, circumferential speed, tensile force, number of chain links, axial distance, etc. At the same time the paper compares generated parameters with manual calculation of the chain gear.
5
Content available Measurement of dynamic characteristics of screw conveyor
Coranič Tomáš, Maščeník Jozef, Ružbarský Juraj, Krenický Tibor
Systemy Wspomagania w Inżynierii Produkcji
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2022
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Vol. 11, iss. 2
66--76
EN
A machine has always been, is and will be the technical progress. The basis of every economy is the progressiveness of manufacturing engineering since it manufactures components for all industries. Technical requirements in manufacturing engineering are constantly leading to an increase of the technical level of manufacturing equipment. Profound knowledge of scientific fields precedes a successful fulfilment of the technical requirements. Structural units of manufacturing machines are complex mechanisms that must work reliably and safely with an emphasis on their important function. These units create new objectives for their research and optimization.
6
Content available Casting machines and properties of Al-Si castings alloys
Ružbarský Juraj, Krenický Tibor, Maščeník Jozef, Coranič Tomáš
Systemy Wspomagania w Inżynierii Produkcji
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2022
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Vol. 11, iss. 2
8--34
EN
The paper focuses on the research of holding pressure inside the mould cavity and pressing speed as technological parameters of die casting. The experiments conducted within the frame of the practical part examined the plunger and the pressure or the holding pressure in the mould cavity influencing the mechanical properties of a casting which were represented by ultimate tensile strength and percentage share of porosity of Al-Si castings. The results of experiments and analysis of the measured values proved the relation between pressure, or holding pressure, in the mould cavity and the ultimate tensile strength and porosity of castings. Plunger pressing speed is closely related to mould cavity filling mode which affected the final porosity of casting. It can be assumed that die casting is positively influenced by the increase of ultimate tensile strength and reduction of porosity during the increase of pressure or of holding pressure in the mould cavity. Higher values of holding pressure caused the elimination of pores which resulted in a decrease in the percentage share of pores in the casting and an increase in values of ultimate tensile strength.
7
Content available Study of Physical and Mechanical Properties of Steel During Grinding and Sharpening
Biały Witold, Ivanova Tatiana Nikolaevna, Žarnovský Jozef, Ružbarský Juraj
Multidisciplinary Aspects of Production Engineering
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2020
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Vol. 3, Iss. 1
128--140
EN
A direct influence on the physical and mechanical state of the surface layer of wedge-shaped plates made of 8KHF steel is exerted by heat generation processes developing in the zone of a high-speed thermal process. Research on the influence of the parameters of a high-speed thermal process on the change in the structure of 8KHF steel (GOST 5950-2000 Russia, standard PN/H 85023 brand NCV1 Poland) was fulfilled. It allowed studying the nature of the change in the microstructure depending on short-term heating to various temperatures and rapid cooling. As a result, critical points of the beginning and the end of structural transformations during heating were determined. Research on thermal processes in a high-speed thermal process made it possible to establish regularities of influence of cutting speed, source speed, contact area, coolant properties and heat transfer coefficient on the temperature and rate of thermal processes in surface layers, as well as their impact on the depth of heating to a certain temperature. The study also allowed us to show the relationship between temperature and rates of heating and cooling. The solution to this problem, taking into account the action of the cooling fluid, gives the opportunity to bring the picture of the development of thermal processes closer to real conditions and makes it possible to reasonably predict the structural state of the surface layer of wedge-shaped parts made of 8KHF steel under various conditions of a high-speed thermal process.
8
Content available Properties of alloys in the crystallization interval
Ružbarský Juraj
Multidisciplinary Aspects of Production Engineering
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2019
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Vol. 2, Iss. 1
375--381
EN
In the contribution the high growth of viscosity and initial stress of alloys in the crystallization interval with undercooling against of the liquidus follows from theoretical analysis. At these alloys used in pressure die casting the permissible undercooling that does not endanger pressure die casting operation. The application of the device for die temperature regulation ensures the safe operation.
9
Content available Possibilities of pressure die casting of iron alloys
Ružbarský Juraj, Sitko Jacek
Management Systems in Production Engineering
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2019
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nr 4 (27)
199--204
EN
The current trends of production of casts are directed towards production of components disposing of higher accuracy, increased quality of surface and homogenous structure. In case of a thin-walled cast the development of speed of pressing and of pressure was observed inside the mould cavity during pressure die casting of ferrous alloys. In case of die casting of ferrous alloys the attention was paid to life service of a pressing piston and of a filling chamber. The optimal temperature of the steel casting ranges from 1600 to 1750°C and optimal mould temperature ranged from 220 to 260°C. The residues having occurred in gates reached the hardness of 38 HRC and in case of casts the value was of 45 HRC. Influence of acting of resistance pressure on the thinwalled casts only minimally. With the increasing resistance pressure the structure becomes more fine-grained and along with the increasing thickness of the wall the influence of the resistance pressure increases as well. Technology of pressure die casting of iron alloys can be compared with the pressure die casting technology of aluminium alloys. As standard, for pressure die casting the cast irons with carbon content of lower than 3% are recommended.
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