Eva Buranská - Academia.edu (original) (raw)

Papers by Eva Buranská

Vedecké práce Materiálovotechnologickej fakulty Slovenskej technickej univerzity v Bratislave so sídlom v Trnave, Jun 1, 2017

The exploration of 209 available Material safety data sheets of 85 straight oils, 46 emulsions, 5... more The exploration of 209 available Material safety data sheets of 85 straight oils, 46 emulsions, 51 semi-synthetics and 27 synthetics was carried out to provide a report on the most used components defined as dangerous substances. As many as 217 of different substances of which 15 were identified as biocides, 17 as corrosion inhibitors or neutralizing agent, 17 were lubricity improvers and 38 different base fluids, lubricity solvents or surfactants, while 93 substances were not identified specifically and 37 substances occurred only once. This article is focused on the list of biocides, neutralizing agents and corrosion inhibitors identified in all types of MWFs and their possible health effects.

Proceedings of the 29th International DAAAM Symposium 2018, 2018

During the drilling process of the aluminium alloy, certain specifications are different from mil... more During the drilling process of the aluminium alloy, certain specifications are different from milling and turning. The major differences: 1) a variable cutting speed along the main cutting edge, 2) more difficult chip evacuation, 3) poor access of liquids into the cutting area. One of the problems is to select a suitable cutting environment for drilling the aluminium alloy to ensure the required quality of the bore (mainly roughness and cylindricality). Dry drilling of aluminium alloys (without using cutting fluids) is an environmentally friendly machining process but also an extremely difficult task due to the tendency of aluminium to adhere to the drills made from conventional materials such as high-speed steel, therefore three cutting environments (namely two different emulsions and compressed air) were used this experiment. The paper is focused on the experiment where the effects of the cutting environment and feed of machining on the bores roughness and cylindricity are evaluated. The article demonstrates multicriterial optimization of input factors (cutting environment, feed) for two defined target functions roughness and cylindricity). The measured values were subjected to mathematical statistical analysis Desirability Function Analysis (DFA). Based on the experiment and studies on this issue combinations of input factors have been identified that have achieved minimum target function values. The results show that the most appropriate combination of the following input factors has been demonstrated: compressed air and feed setting at the lowest level, ie 0.2 mm.

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2021

The main objective of this research was to analyse the limitations of iCT - industrial computer t... more The main objective of this research was to analyse the limitations of iCT - industrial computer tomography for measuring the wood pores characteristics as a new non-destructive method which is primarily intended to measure and inspect complete components primarily made of plastics or light metal. The subject matter of this paper are wood samples of paulownia (Paulownia tomentosa) and ash (Fraxinus excelsior) before and after thermal treatment. Porosity, pore volume and distribution of pores on the wood samples before and after the heat treatment were measured by iCT Metrotom 1500. The total porosity of the samples before thermal treatment was 5.28 % (paulownia) and 14.90 % (ash), while after thermal treatment, porosity increased to 9.50 % (paulownia) and to 30.78 % (ash). Changes in the porosity of the samples before and after heat treatment show an increase in porosity of 3.87 % (paulownia) and 15.88 % (ash).

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2021

Synthetic dyes widely used in many kinds of industry affect the colour of wastewater when release... more Synthetic dyes widely used in many kinds of industry affect the colour of wastewater when released to environment due to insufficient treatment in typical sewage treatment plants. Only a small dose of those dyes may significantly affect colour of water and, according to the chemical composition, may pose risks to wildlife and humans. In the research described in this study, decolorization of three various dyes was investigated. Since colour removal of Congo Red such as Methylene blue using ozone have been reported by several authors, and the literature on Naphthol Green B is rather limited, in the present study we compare the decolorization rate of CR, MB and NGB. The colour removal occurred quickly and more than 90% of colour reduction was achieved within 3-6 minutes throughout all tested pH of the solution.

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2020

The object of the study was to create a computer model that resembles the process of cold drawing... more The object of the study was to create a computer model that resembles the process of cold drawing seamless steel tubes, and evaluate the influence of selected process parameters on selected final dimensions and tolerances of STL models of the tubes obtained from DEFORM simulation software. The STL models of tubes generated from the simulations were evaluated, and the effects of the reduction angle and the friction coefficient on the inner/outer diameter, inner/outer roundness and concentricity were subsequently found. It was proven that the inner and outer diameters are not influenced by different values of the friction coefficient at the same reduction angle. On the other hand, increasing value of the reduction angle affects decrease of the outer and inner diamaters after drawing. Furthermore, this experimental investigation vindicates that friction coefficient and reduction angle have the minimal impact on the inner/outer roundness and outer concentricity.

DAAAM Proceedings, 2018

Measuring biodegradability of poorly soluble substances according to the standardized test method... more Measuring biodegradability of poorly soluble substances according to the standardized test methods where the carbon dioxide captured in the absorption solution is the main parameter is time consuming and needs manual analysis. To overcome these problems, it was used a modified closed apparatus consist of two bottlesreaction bottle where the biodegradability takes place and absorption bottle where the carbon dioxide produced by the microbial inoculum is trapped. For the measurement of trapped carbon dioxide it is utilize the fact that the barium carbonates precipitate, which is the result of simple chemical reaction, decrease conductivity of the absorption solution linearly. To allow synchronized measurement of 8-12 apparatuses a real-time monitoring interface for recording conductivity of 8-12 probes was constructed and tested with the standard substance glucose during 14 days of continual measurements. Self-developed interface showed its full applicability in the biodegradability testing. A substance with at least 80 ppm C may be assessed by this method.

Materials Science Forum, 2018

The main paper idea was compared three methods (Contact CenterMax and contactless ATOS TripleScan... more The main paper idea was compared three methods (Contact CenterMax and contactless ATOS TripleScan II, Metrotom 1500) for data acquisition to the output characteristics of steel drawing tubes. Outer and internal diameters, eccentricity and ovality were measured. Steel tubes produced by drawing should accomplish shape and dimensional characteristics. These can be measured by various contact and contactless methods. Each of these methods have advantages and disadvantages. The computed tomography advantages are, that we obtain both outer and inner tube shapes. Output is a 3D model from which you can get the elements to evaluate the characteristics. The data acquisition is limited by wall thickness and material density and that is disadvantage. The 3D scanner advantages are, that we obtain outer tube shapes with different diameters and wall thickness regardless of material density. Output is a 3D model. Problem is to obtain data about complex internal shape limited by tube length and dia...

MATEC Web of Conferences, 2019

Measurement by computed tomography is very useful in evaluation of dimensions and internal struct... more Measurement by computed tomography is very useful in evaluation of dimensions and internal structure. There are still some problems which need to be solved. Scanning accuracy depends, among other things, on the part´s material. Metal parts have high density and their scanning leads many times to failure. This paper deals with evaluation of accuracy of seamless steel tube scanning by industrial computed tomography. This method of scanning can lead to substitution of destructive method for measurement,but it is necessary to have knowledge if the scan has required accuracy. The tube with different diameters in length is scanned by X-Ray beam and it is evaluated inner and outer diameter, concentricity and wall thickness in 8 sections. The accuracy of scan is compared with reference values achieved by coordinate measuring machine in the same sections.

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2019

Fire protection is an important part of the industry where flammable and explosive dusts are foun... more Fire protection is an important part of the industry where flammable and explosive dusts are found. Production, storage and transport of food powders such as flour can be very dangerous in terms of explosiveness. The article deals with the measurement of explosion characteristics of wheat flour dust. The measurements were carried out according to EN 14034-1+A1:2011 Determination of explosion characteristics of dust clouds. Part 1: Determination of the maximum explosion pressure pmax of dust clouds and the maximum rate of explosion pressure rise according to EN 14034-2+A1:2012 Determination of explosion characteristics of dust clouds - Part 2: Determination of the maximum rate of explosion pressure rise (dp/dt)max of dust clouds. A sample of wheat flour with a median particle size 84 μm exhibits the maximum explosion pressure 7.00 bar at the concentration of 600 g.m−3 and then explosion constant is 16.9 bar.s−1.m. A sample of wheat flour with a median particle size 50 μm exhibits the...

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2019

The paper is focused on additive manufacturing (AM) which is the process of producing objects fro... more The paper is focused on additive manufacturing (AM) which is the process of producing objects from a three-dimensional (3D) model by joining materials layer by layer, as opposed to the subtractive manufacturing methodologies [1], directly from raw material in powder, liquid, sheet, or a filament form without the need for moulds, tools, or dies. The article demonstrates potential environmental implications of additive manufacturing related to the key issues including energy use, occupational health, waste and lifecycle impact. AM provides a cost-effective and time-efficient way to fabricating products with complicated geometries, advanced material properties and functionality. Based on this review, we identified that additive manufacturing will have a significant societal impact in the near future. A critical technical review of the promises and potential issues of AM is beneficial for advancing its further development.

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2019

The paper is focused on the experiment where the effects of the cutting environment and feed of d... more The paper is focused on the experiment where the effects of the cutting environment and feed of drilling on the bores roughness and cylindricity were evaluated. Dry drilling of aluminium alloys (without using cutting fluids) is an environmentally friendly machining process but also an extremely difficult task, which is due to the tendency of aluminium to adhere to the drills made of conventional materials such as high-speed steel; and therefore three cutting environments (namely two different emulsions and compressed air) were used in the experiment. The article demonstrates multicriterial optimization of input factors (cutting environment, feed) for two defined target functions: roughness and cylindricity). The measured values were subjected to mathematico–statistical Analysis of Variance (ANOVA). ANOVA was used for examining the effects of machining parameters and their contribution to the surface roughness and bores cylindricity. The optimal cutting parameters were evaluated for ...

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2016

A real-time monitoring and regulation system for metalworking fluids is being constructed to be i... more A real-time monitoring and regulation system for metalworking fluids is being constructed to be installed in the Centre of excellence of 5-axis machining at the Faculty of Materials Science and Technology in Trnava. The article is focused on the description of the main components of the monitoring system and preliminary characterization of the software utilized in the regulation. The monitoring system will contain four probes to record real time values of pH, conductivity, temperature and concentration. After processing of recorded data by the LabVIEW software, an adjustment of the Metalworking fluid in the reservoir tank will be realized by the regulation part of the proposed system to optimum properties of the fluid, by adding water or concentrate. The designed device will provide an easy system which will control the quality of used metalworking fluid during its lifetime and maintain it on its optimum condition without human operator’s assistance.

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2016

The issues of cutting environment and a suitable choice of cutting conditions by drilling are the... more The issues of cutting environment and a suitable choice of cutting conditions by drilling are the main subjects of the article. Attention is paid to the application of the drilling process into the carbon steel. Analysed were the phenomena that adversely affect the tool life. The article demonstrated solutions how to remove these adverse effects. The multicriteria optimisation of input factors (cutting fluid concentration, cutting speed) for a defined target function (tool life) was applied. The measured values were subjected to mathematical–statistical analysis (ANOVA). Based on the implemented experiment and study of this issue, we determined the combinations of input factors, which achieved minimal values of target functions. Based on the implemented experiment and study of this issue, we also determined the combinations of input factors, which achieved minimal values of target functions. Based on this allegation, the most appropriate combination of the following input factors wa...

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2017

Exploration of 209 available Material safety data sheets of 85 straight oils, 46 emulsions, 51 se... more Exploration of 209 available Material safety data sheets of 85 straight oils, 46 emulsions, 51 semi-synthetics and 27 synthetics was carried out to provide a report on the most widely used components defined as dangerous substances. As many as 217 of different substances of which 15 were identified as biocides, 17 as corrosion inhibitors or neutralizing agent, 17 were lubricity improvers and 38 different base fluids, lubricity solvents or surfactants, while 93 substances were not identified specifically and 37 substances occurred only once. This article is focused on the list of base fluids in straight oils and their possible health effects.

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2013

Article discusses the diagnostics and possibility of monitoring cutting fluids and proposes a sol... more Article discusses the diagnostics and possibility of monitoring cutting fluids and proposes a solution: on-line monitoring system. In regard to verify the possibility of using various methods to identify changes in the cutting fluids were carried out experiments to measure electrical parameters

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2014

The contribution discusses the issue of modern education system of university. This method of edu... more The contribution discusses the issue of modern education system of university. This method of education was designed within the KEGA project. Implementation of on-line classroom for dynamic education of the secondary technical school and university students focused on the design and manufacturing of freeform surfaces. The main objective of this teaching method of is improving the parent faculty cooperation with training centres and increasing the interest of secondary school students in the university studies of technical orientation.

Advanced Materials Research, 2013

The article deals with preliminary study of possible utilization of ozone oxidative capacity for ... more The article deals with preliminary study of possible utilization of ozone oxidative capacity for eliminating the organic content of operationally exhausted MWFs. This research was focused on the treatment of 17 samples clean MWFs diluted concentrates (samples mostly from Castrol, Shell Macron GmbH, Fuchs Oil corp., Agip GmbH, Blaser Swisslube AG, Cimcool Industrial Products BV, Houghton, Exxon Mobile and Quaker) by ozone. The study is focused to the effect of high concentrations of ozone during 4 hours on the kinetics of total organic content using parameters such as COD and TOC. The concentration of the tested MWFs was set at 1% (v/v). Selected MWFs consisted of all types of water miscible – emulsions, semi-synthetic and synthetic fluids.

Advanced Materials Research, 2013

The main aim of this study was to evaluate the ability of the activated sludge from sewage treatm... more The main aim of this study was to evaluate the ability of the activated sludge from sewage treatment plant to degrade a part of the 12 randomly selected metalworking fluids (MWFs) according to OECD 302B (with different addition of activated sludge AS 0.25 g/l, 0.50 g/l and 1.00 g/l of suspended solids - SS). The degradability test showed that, after the first 3 hours of cultivating, adsorption grew with the increasing amount of inoculums. In the case of AS addition 1.00 g/l of SS were the adsorption rate lower than 20 % in four samples, in the case of AS addition 0.50 g/l of SS in 9 samples and in the case of AS addition 0.25 g/l of SS in all 12 tested samples. In four samples were also observed the lag phase (adaptation of the bacterias to the presented carbon source). If occur adsorption rate more than 20% it is probably impossible to distinguish biological degradation of organic matter from abiotic elimination from the suspension.

Key Engineering Materials, 2013

Metalworking fluids (MWFs) are used during machining to prolong the life of the tool, carry away ... more Metalworking fluids (MWFs) are used during machining to prolong the life of the tool, carry away debris, and protect the surfaces of work pieces. During their lifetime they are prone to intensive microbial deterioration. Microbial contamination can be a problem, primarily because of potentional adverse effect to the operators health and effect on a fluid quality, performance and economics. Bactericides are added to control the growth of micro-organisms. The paper deals with possible utilization of ozone for sterilization of MWFs to avoid presence of biocides. There were tested 16 MWFs for their reaction to ozone application in extreme conditions (concentration of MWF 1% (v/v), ozone concentration 15 g hour-1, application of ozone 4 hours). After, was realized pilot sanitation of selected in-use MWF for elimination of presence bacterias by applying lower concentration of O3, there were measured few parameters to control the quality of treatment fluid.

Vedecké práce Materiálovotechnologickej fakulty Slovenskej technickej univerzity v Bratislave so sídlom v Trnave, Jun 1, 2017

The exploration of 209 available Material safety data sheets of 85 straight oils, 46 emulsions, 5... more The exploration of 209 available Material safety data sheets of 85 straight oils, 46 emulsions, 51 semi-synthetics and 27 synthetics was carried out to provide a report on the most used components defined as dangerous substances. As many as 217 of different substances of which 15 were identified as biocides, 17 as corrosion inhibitors or neutralizing agent, 17 were lubricity improvers and 38 different base fluids, lubricity solvents or surfactants, while 93 substances were not identified specifically and 37 substances occurred only once. This article is focused on the list of biocides, neutralizing agents and corrosion inhibitors identified in all types of MWFs and their possible health effects.

Proceedings of the 29th International DAAAM Symposium 2018, 2018

During the drilling process of the aluminium alloy, certain specifications are different from mil... more During the drilling process of the aluminium alloy, certain specifications are different from milling and turning. The major differences: 1) a variable cutting speed along the main cutting edge, 2) more difficult chip evacuation, 3) poor access of liquids into the cutting area. One of the problems is to select a suitable cutting environment for drilling the aluminium alloy to ensure the required quality of the bore (mainly roughness and cylindricality). Dry drilling of aluminium alloys (without using cutting fluids) is an environmentally friendly machining process but also an extremely difficult task due to the tendency of aluminium to adhere to the drills made from conventional materials such as high-speed steel, therefore three cutting environments (namely two different emulsions and compressed air) were used this experiment. The paper is focused on the experiment where the effects of the cutting environment and feed of machining on the bores roughness and cylindricity are evaluated. The article demonstrates multicriterial optimization of input factors (cutting environment, feed) for two defined target functions roughness and cylindricity). The measured values were subjected to mathematical statistical analysis Desirability Function Analysis (DFA). Based on the experiment and studies on this issue combinations of input factors have been identified that have achieved minimum target function values. The results show that the most appropriate combination of the following input factors has been demonstrated: compressed air and feed setting at the lowest level, ie 0.2 mm.

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2021

The main objective of this research was to analyse the limitations of iCT - industrial computer t... more The main objective of this research was to analyse the limitations of iCT - industrial computer tomography for measuring the wood pores characteristics as a new non-destructive method which is primarily intended to measure and inspect complete components primarily made of plastics or light metal. The subject matter of this paper are wood samples of paulownia (Paulownia tomentosa) and ash (Fraxinus excelsior) before and after thermal treatment. Porosity, pore volume and distribution of pores on the wood samples before and after the heat treatment were measured by iCT Metrotom 1500. The total porosity of the samples before thermal treatment was 5.28 % (paulownia) and 14.90 % (ash), while after thermal treatment, porosity increased to 9.50 % (paulownia) and to 30.78 % (ash). Changes in the porosity of the samples before and after heat treatment show an increase in porosity of 3.87 % (paulownia) and 15.88 % (ash).

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2021

Synthetic dyes widely used in many kinds of industry affect the colour of wastewater when release... more Synthetic dyes widely used in many kinds of industry affect the colour of wastewater when released to environment due to insufficient treatment in typical sewage treatment plants. Only a small dose of those dyes may significantly affect colour of water and, according to the chemical composition, may pose risks to wildlife and humans. In the research described in this study, decolorization of three various dyes was investigated. Since colour removal of Congo Red such as Methylene blue using ozone have been reported by several authors, and the literature on Naphthol Green B is rather limited, in the present study we compare the decolorization rate of CR, MB and NGB. The colour removal occurred quickly and more than 90% of colour reduction was achieved within 3-6 minutes throughout all tested pH of the solution.

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2020

The object of the study was to create a computer model that resembles the process of cold drawing... more The object of the study was to create a computer model that resembles the process of cold drawing seamless steel tubes, and evaluate the influence of selected process parameters on selected final dimensions and tolerances of STL models of the tubes obtained from DEFORM simulation software. The STL models of tubes generated from the simulations were evaluated, and the effects of the reduction angle and the friction coefficient on the inner/outer diameter, inner/outer roundness and concentricity were subsequently found. It was proven that the inner and outer diameters are not influenced by different values of the friction coefficient at the same reduction angle. On the other hand, increasing value of the reduction angle affects decrease of the outer and inner diamaters after drawing. Furthermore, this experimental investigation vindicates that friction coefficient and reduction angle have the minimal impact on the inner/outer roundness and outer concentricity.

DAAAM Proceedings, 2018

Measuring biodegradability of poorly soluble substances according to the standardized test method... more Measuring biodegradability of poorly soluble substances according to the standardized test methods where the carbon dioxide captured in the absorption solution is the main parameter is time consuming and needs manual analysis. To overcome these problems, it was used a modified closed apparatus consist of two bottlesreaction bottle where the biodegradability takes place and absorption bottle where the carbon dioxide produced by the microbial inoculum is trapped. For the measurement of trapped carbon dioxide it is utilize the fact that the barium carbonates precipitate, which is the result of simple chemical reaction, decrease conductivity of the absorption solution linearly. To allow synchronized measurement of 8-12 apparatuses a real-time monitoring interface for recording conductivity of 8-12 probes was constructed and tested with the standard substance glucose during 14 days of continual measurements. Self-developed interface showed its full applicability in the biodegradability testing. A substance with at least 80 ppm C may be assessed by this method.

Materials Science Forum, 2018

The main paper idea was compared three methods (Contact CenterMax and contactless ATOS TripleScan... more The main paper idea was compared three methods (Contact CenterMax and contactless ATOS TripleScan II, Metrotom 1500) for data acquisition to the output characteristics of steel drawing tubes. Outer and internal diameters, eccentricity and ovality were measured. Steel tubes produced by drawing should accomplish shape and dimensional characteristics. These can be measured by various contact and contactless methods. Each of these methods have advantages and disadvantages. The computed tomography advantages are, that we obtain both outer and inner tube shapes. Output is a 3D model from which you can get the elements to evaluate the characteristics. The data acquisition is limited by wall thickness and material density and that is disadvantage. The 3D scanner advantages are, that we obtain outer tube shapes with different diameters and wall thickness regardless of material density. Output is a 3D model. Problem is to obtain data about complex internal shape limited by tube length and dia...

MATEC Web of Conferences, 2019

Measurement by computed tomography is very useful in evaluation of dimensions and internal struct... more Measurement by computed tomography is very useful in evaluation of dimensions and internal structure. There are still some problems which need to be solved. Scanning accuracy depends, among other things, on the part´s material. Metal parts have high density and their scanning leads many times to failure. This paper deals with evaluation of accuracy of seamless steel tube scanning by industrial computed tomography. This method of scanning can lead to substitution of destructive method for measurement,but it is necessary to have knowledge if the scan has required accuracy. The tube with different diameters in length is scanned by X-Ray beam and it is evaluated inner and outer diameter, concentricity and wall thickness in 8 sections. The accuracy of scan is compared with reference values achieved by coordinate measuring machine in the same sections.

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2019

Fire protection is an important part of the industry where flammable and explosive dusts are foun... more Fire protection is an important part of the industry where flammable and explosive dusts are found. Production, storage and transport of food powders such as flour can be very dangerous in terms of explosiveness. The article deals with the measurement of explosion characteristics of wheat flour dust. The measurements were carried out according to EN 14034-1+A1:2011 Determination of explosion characteristics of dust clouds. Part 1: Determination of the maximum explosion pressure pmax of dust clouds and the maximum rate of explosion pressure rise according to EN 14034-2+A1:2012 Determination of explosion characteristics of dust clouds - Part 2: Determination of the maximum rate of explosion pressure rise (dp/dt)max of dust clouds. A sample of wheat flour with a median particle size 84 μm exhibits the maximum explosion pressure 7.00 bar at the concentration of 600 g.m−3 and then explosion constant is 16.9 bar.s−1.m. A sample of wheat flour with a median particle size 50 μm exhibits the...

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2019

The paper is focused on additive manufacturing (AM) which is the process of producing objects fro... more The paper is focused on additive manufacturing (AM) which is the process of producing objects from a three-dimensional (3D) model by joining materials layer by layer, as opposed to the subtractive manufacturing methodologies [1], directly from raw material in powder, liquid, sheet, or a filament form without the need for moulds, tools, or dies. The article demonstrates potential environmental implications of additive manufacturing related to the key issues including energy use, occupational health, waste and lifecycle impact. AM provides a cost-effective and time-efficient way to fabricating products with complicated geometries, advanced material properties and functionality. Based on this review, we identified that additive manufacturing will have a significant societal impact in the near future. A critical technical review of the promises and potential issues of AM is beneficial for advancing its further development.

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2019

The paper is focused on the experiment where the effects of the cutting environment and feed of d... more The paper is focused on the experiment where the effects of the cutting environment and feed of drilling on the bores roughness and cylindricity were evaluated. Dry drilling of aluminium alloys (without using cutting fluids) is an environmentally friendly machining process but also an extremely difficult task, which is due to the tendency of aluminium to adhere to the drills made of conventional materials such as high-speed steel; and therefore three cutting environments (namely two different emulsions and compressed air) were used in the experiment. The article demonstrates multicriterial optimization of input factors (cutting environment, feed) for two defined target functions: roughness and cylindricity). The measured values were subjected to mathematico–statistical Analysis of Variance (ANOVA). ANOVA was used for examining the effects of machining parameters and their contribution to the surface roughness and bores cylindricity. The optimal cutting parameters were evaluated for ...

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2016

A real-time monitoring and regulation system for metalworking fluids is being constructed to be i... more A real-time monitoring and regulation system for metalworking fluids is being constructed to be installed in the Centre of excellence of 5-axis machining at the Faculty of Materials Science and Technology in Trnava. The article is focused on the description of the main components of the monitoring system and preliminary characterization of the software utilized in the regulation. The monitoring system will contain four probes to record real time values of pH, conductivity, temperature and concentration. After processing of recorded data by the LabVIEW software, an adjustment of the Metalworking fluid in the reservoir tank will be realized by the regulation part of the proposed system to optimum properties of the fluid, by adding water or concentrate. The designed device will provide an easy system which will control the quality of used metalworking fluid during its lifetime and maintain it on its optimum condition without human operator’s assistance.

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2016

The issues of cutting environment and a suitable choice of cutting conditions by drilling are the... more The issues of cutting environment and a suitable choice of cutting conditions by drilling are the main subjects of the article. Attention is paid to the application of the drilling process into the carbon steel. Analysed were the phenomena that adversely affect the tool life. The article demonstrated solutions how to remove these adverse effects. The multicriteria optimisation of input factors (cutting fluid concentration, cutting speed) for a defined target function (tool life) was applied. The measured values were subjected to mathematical–statistical analysis (ANOVA). Based on the implemented experiment and study of this issue, we determined the combinations of input factors, which achieved minimal values of target functions. Based on the implemented experiment and study of this issue, we also determined the combinations of input factors, which achieved minimal values of target functions. Based on this allegation, the most appropriate combination of the following input factors wa...

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2017

Exploration of 209 available Material safety data sheets of 85 straight oils, 46 emulsions, 51 se... more Exploration of 209 available Material safety data sheets of 85 straight oils, 46 emulsions, 51 semi-synthetics and 27 synthetics was carried out to provide a report on the most widely used components defined as dangerous substances. As many as 217 of different substances of which 15 were identified as biocides, 17 as corrosion inhibitors or neutralizing agent, 17 were lubricity improvers and 38 different base fluids, lubricity solvents or surfactants, while 93 substances were not identified specifically and 37 substances occurred only once. This article is focused on the list of base fluids in straight oils and their possible health effects.

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2013

Article discusses the diagnostics and possibility of monitoring cutting fluids and proposes a sol... more Article discusses the diagnostics and possibility of monitoring cutting fluids and proposes a solution: on-line monitoring system. In regard to verify the possibility of using various methods to identify changes in the cutting fluids were carried out experiments to measure electrical parameters

Research Papers Faculty of Materials Science and Technology Slovak University of Technology, 2014

The contribution discusses the issue of modern education system of university. This method of edu... more The contribution discusses the issue of modern education system of university. This method of education was designed within the KEGA project. Implementation of on-line classroom for dynamic education of the secondary technical school and university students focused on the design and manufacturing of freeform surfaces. The main objective of this teaching method of is improving the parent faculty cooperation with training centres and increasing the interest of secondary school students in the university studies of technical orientation.

Advanced Materials Research, 2013

The article deals with preliminary study of possible utilization of ozone oxidative capacity for ... more The article deals with preliminary study of possible utilization of ozone oxidative capacity for eliminating the organic content of operationally exhausted MWFs. This research was focused on the treatment of 17 samples clean MWFs diluted concentrates (samples mostly from Castrol, Shell Macron GmbH, Fuchs Oil corp., Agip GmbH, Blaser Swisslube AG, Cimcool Industrial Products BV, Houghton, Exxon Mobile and Quaker) by ozone. The study is focused to the effect of high concentrations of ozone during 4 hours on the kinetics of total organic content using parameters such as COD and TOC. The concentration of the tested MWFs was set at 1% (v/v). Selected MWFs consisted of all types of water miscible – emulsions, semi-synthetic and synthetic fluids.

Advanced Materials Research, 2013

The main aim of this study was to evaluate the ability of the activated sludge from sewage treatm... more The main aim of this study was to evaluate the ability of the activated sludge from sewage treatment plant to degrade a part of the 12 randomly selected metalworking fluids (MWFs) according to OECD 302B (with different addition of activated sludge AS 0.25 g/l, 0.50 g/l and 1.00 g/l of suspended solids - SS). The degradability test showed that, after the first 3 hours of cultivating, adsorption grew with the increasing amount of inoculums. In the case of AS addition 1.00 g/l of SS were the adsorption rate lower than 20 % in four samples, in the case of AS addition 0.50 g/l of SS in 9 samples and in the case of AS addition 0.25 g/l of SS in all 12 tested samples. In four samples were also observed the lag phase (adaptation of the bacterias to the presented carbon source). If occur adsorption rate more than 20% it is probably impossible to distinguish biological degradation of organic matter from abiotic elimination from the suspension.

Key Engineering Materials, 2013

Metalworking fluids (MWFs) are used during machining to prolong the life of the tool, carry away ... more Metalworking fluids (MWFs) are used during machining to prolong the life of the tool, carry away debris, and protect the surfaces of work pieces. During their lifetime they are prone to intensive microbial deterioration. Microbial contamination can be a problem, primarily because of potentional adverse effect to the operators health and effect on a fluid quality, performance and economics. Bactericides are added to control the growth of micro-organisms. The paper deals with possible utilization of ozone for sterilization of MWFs to avoid presence of biocides. There were tested 16 MWFs for their reaction to ozone application in extreme conditions (concentration of MWF 1% (v/v), ozone concentration 15 g hour-1, application of ozone 4 hours). After, was realized pilot sanitation of selected in-use MWF for elimination of presence bacterias by applying lower concentration of O3, there were measured few parameters to control the quality of treatment fluid.

Polymers and their processing by engineering production technologies (injection, moulding or addi... more Polymers and their processing by engineering production technologies (injection, moulding or additive manufacturing) are being increasingly used. An explosive atmosphere can be created by the powder form of these polymer materials, and introduction of preventive safeguards to control safety is required for their use. Determination of the fire parameters of powder samples of Polyamide PA12, Polypropylene, and ultra-high molecular weight polyethylene (UHMW Polyethylene) is the subject of the current article. The results showed? that one of the samples used was not flammable and thus safe for use in terms of explosiveness. Two samples were flammable and explosive. The lower explosive limit was 30 g.m-3 (Polyamide PA12) and 60 g.m-3 (UHMW Polyethylene). The maximum explosion pressure of the samples was 6.47 (UHMW Polyethylene) and 6.76 bar (Polyamide PA 12). The explosion constant Kst of the samples was 116.6 bar.m.s-1 (Polyamide PA 12) and 97.1 bar.m.s-1 (UHMW Polyethylene). Therefore, when using polymers in production technologies, it is necessary to know their fire parameters, and to design effective explosion prevention measures for flammable and explosive polymers.