Explanipedia

Possibility of Utilization of Gate Geometry to Modify the Mechanical and Structural Properties of Castings on the Al-Si Basis Open

Ján Majerník, Štefan Gašpár, Ján Kmeč, Monika Karková, Jozef Maščeník · 2020

The mechanical properties of die castings correlate with the inner structure of a casting, distribution of the eutectic phases, and with the content and distribution of porous cavities in the casting volume. This submitted paper deals with…

The Predictive Model of Surface Texture Generated by Abrasive Water Jet for Austenitic Steels Open

Ján Kmeč, Miroslav Gombár, Marta Harničárová, Ján Valíček, Milena Kušnerová , et al. · 2020

Austenitic stainless steel belongs to the best oxidation-resistant alloys, which must function effectively and reliably when used in a corrosion environment. Their attractive combination of properties ensures their stable position in the s…

Analysis and Prediction of the Machining Force Depending on the Parameters of Trochoidal Milling of Hardened Steel Open

Michał Šajgalík, Milena Kušnerová, Marta Harničárová, Ján Valíček, Andrej Czán , et al. · 2020

Current demands on quality are the engine of searching for new progressive materials which should ensure enough durability in real conditions. Due to their mechanical properties, however, they cannot be applied to conventional machining me…

The Combined Relative Uncertainty of Measurement Results by Prototype Semi-Automated Calorimetric Chamber Open

Milena Kušnerová, Ján Valíček, Marta Harničárová, Ján Kmeč, Michal Řepka , et al. · 2019

The paper presents an evaluation of the combined relative uncertainty of the result of direct step temperature measurements aimed at evaluation of the indirect measurements of the specific thermal capacity of the heat insulating concrete b…

Experimental Analysis of the Influence of Factors Acting on the Layer Thickness Formed by Anodic Oxidation of Aluminium Open

Miroslav Gombár, Alena Vagaská, Marta Harničárová, Ján Valíček, Milena Kušnerová , et al. · 2019

The current practice in the field of anodic oxidation of aluminium and its alloys is based mainly on a set of partial empirical experiences of technologists obtained during surface treatment. The aim of the presented paper is deeper and mo…

Proposal for a method of measurement and control of surface quality in the course of abrasive waterjet cutting of material Open

Ján Kmeč, Marta Harničárová, Cristina Borzan, Marian Boržan, Ján Valíček , et al. · 2019

The paper deals with the automation of the hydroabrasive production process, which leads to higher productivity and production optimization. In the submitted work, the basis of control design is a topography function of surface roughness o…

PLANNING MANUFACTURING PROCESSES OF SURFACE FORMING WITHIN INDUSTRY 4.0 Open

Ján Kmeč, Monika Karková, Ján Majerník · 2018

The article describes modifications to the effector of a manipulator arm proposed in order to increase the accuracy of jaw force measurements.Gripping force measurement is performed using strain gauges.Their proper positioning and connecti…

Experimental Study of the Process of Radial Rotation Profiling of Wheel Rims Resulting in Formation and Technological Flattening of the Corrugations Open

Ruslan Puzyr, Tetiana Haikova, Ján Majerník, Monika Karková, Ján Kmeč · 2018

Experimental studies of the wheel rim workpieces with additional technological corrugations have been carried out the results of which showed the ineffectiveness of this technique in profiling to increase thickness of the radial profile ju…

ANALYSIS OF INFLUENCING THE MACROSTRUCTURE AND HARDNESS OF CASTING SURFACE LAYER BY CHANGING CONDITIONS OF CRYSTALLIZATION Open

Monika Karková, Ján Majerník, Ján Kmeč · 2017

The influence of high doses of beta radiation on the changes in the structure and selected properties (mechanical and thermal) polymers were proved.Using high doses of beta radiation for polybutylene terephthalate (PBT) and its influence o…

CRITICAL RUNNER LENGTH AS A CONSTRAINING FACTOR IN GATING SYSTEM DESIGN Open

Ján Majerník, Ján Kmeč, Monika Karková · 2017

The influence of high doses of beta radiation on the changes in the structure and selected properties (mechanical and thermal) polymers were proved.Using high doses of beta radiation for polybutylene terephthalate (PBT) and its influence o…

Possibilities for Change of Thermoplastic Tensile Properties Using Admixture of Recyclable Material Open

Ján Majerník, Ján Kmeč, Monika Karková, Martin Podařil · 2017

Polymeric materials are thanks its processing and utility properties materials in demand of common and special use. They are also largely replacing conventional materials. As the popularity of polymeric materials grows, also the amount of …

The Mechanics of Machining Ultrafine-Grained Ti-6Al-4Mo Alloy Processed Severe Plastic Deformation Open

Anastasiia Symonova, Enrico Filippi, Ján Kmeč, Ján Majerník, Monika Karková · 2017

The physics features of the cutting process of ultrafine-grained metals produced by the method of severe plastic deformation are considered. The aim of the research was to evaluate, whether the grain size of titanium alloy has an influence…

Analysis of Influence Dimensions of the Gate on the Homogeneity of the Low Weight Castings Made of Silumin Open

Ján Majerník, Ján Kmeč, Miroslav Gombár, Michal Halapi · 2017

The design of the gating system is a major factor in the internal homogeneity for casting. A properly designed system should ensure a proper and continuous filling of cavities in a mold. A continuous filling in a mold cavity gives the init…

The Use of Simulation Programmes for the Structural Analysis and Engineering Optimization of Gating System Structures for Use with High Pressure Die Casting Technology Open

Ján Majerník, Ján Kmeč, Miroslav Gombár, Martin Podařil · 2017

A properly designed and engineered gating system for use with high pressure die casting technology will produce castings with excellent mechanical properties. The gating system must secure the fast and continuous filling of the cavity. An …

Analysis of the Impact of the Construction of a Gate on the Macroscopic Structure of a Casting and Its Influence on the Mechanical Properties of Castings Open

Ján Majerník, Ján Kmeč, Monika Karková · 2017

The macroscopic structure of a casting has a direct impact on its mechanical properties. The porosity and homogeneity of a casting closely correlate with its tear strength characteristics. In order to achieve the best mechanical properties…

Analysis of physical factors on chosen properties of anodic alumina oxide (AAO) layers and environment Open

Miroslav Gombár, Ján Kmeč, Miroslav Badida, Lýdia Sobotová, Alena Vagaská , et al. · 2016

In the contribution is evaluated an impact of physical factors of anodizing process, namely the temperature of an electrolyte, anodizing time and voltage, on the change of values of Vickers microhardness and thickness of formed layer of ex…

Evaluation of the Parameters Affecting the Cohesion of Fine Grained Soil Open

Terezie Vondráčková, Ján Kmeč, Jiří Čejka, Ladislav Bartuška, Ondřej Stopka · 2016

Cohesion of the soils is one of the most important parameters which soil is evaluated in terms of its suitability for building foundations. Safety of construction is in fact dependent on the strength of soil, respectively shear strength. F…

Logistic Approach of Building and Development of Production Systems Open

Ján Kmeč, Štefan Valenčík, Miroslav Gombár, Monika Karková, Alena Vagaská · 2016

The paper presents a complex of information aimed at automated production systems structures and simulation. For production systems intergrated structures formation it uses logistic principles for making the internal material flow among va…

The contribution to coating quality evaluation by statistical methods Open

Miroslav Badida, Lýdia Sobotová, Miroslav Gombár, Ján Kmeč, Daniel Kučerka , et al. · 2016

The paper deals with evaluation of quality of electrolytic coating by statistical methods. Electrolytic solution was created by ZnCl₂ within interval of 0,062 mol•l^-1to 1,01 mol•l^-1, NaCl ranging from 7,01 …

The Cycle of Abrasives in the Process of Cutting of Materials Abrasive Waterjet Technology within the Logistics Companies Open

Monika Karková, Ján Kmeč, Daniel Kučerka · 2016

Today, stalked company is defined as an industrial. Technologies are developed and refined, and this leads to innovation in the field of environmental protection and logistics. Environmental protection as a concept is quite lengthy and inc…

Identifikacija logističkog rizika novih i renoviranih strojeva za proizvodnju Open

Ján Kmeč, Štefan Valenčík, Miroslav Gombár, Daniel Kučerka, Alena Vagaská · 2016

The paper deals with logistics risk management safety program of new and renovated machines, which as members of the management of company must deal with. There are accountable consequences of untreated risks that may stop a dangerous even…

Measurement of Noise during the Process of Cutting Materials by Water Jet Open

Ján Kmeč, Daniel Kučerka, Miroslav Gombár, Monika Karková, Alena Vagaská · 2016

Water jet technology material cutting is analyzed from the point of view of environment, namely of an impact of noise to production process working conditions. Except noise, vibrations also influence working environment but this problem in…

Heavy Machinery Required for the Proper Application of Geosynthetic Products in the Implementation of Transport Constructions Open

Ondřej Stopka, Daniel Kučerka, Rudolf Kampf, Ján Ližbetín, Ladislav Bartuška , et al. · 2016

The application of geosynthetic materials has become an ordinary part of not only transport constructions. Such materials are very versatile depending on the earth construction requirements and soil character. With regard to their populari…

Soil Consolidation Parameters Derived from CPTu Probing Open

Jozef Vlček, Roman Bulko, Ladislav Bartuška, Ján Kmeč · 2016

Continued development of infrastructure in Slovakia will open new sections of motorways and expressways. The motorwayy D1 from Bratislava to Košice is being built in section Lietavská Lúčka - Višňové - Dubna Skala. The knowledge of geology…

Assessing the Relationship of Mineability of Rocks and Machines for Earthwork Open

Daniel Kučerka, Ondřej Stopka, Ján Kmeč, Monika Karková, Miroslav Gombár , et al. · 2016

Classification of the mineability of rocks is an integral part of the earthworks occurring in the implementation of engineering works. The existence of degrees of excavation difficulty allows us to specify the needs of mechanisms for earth…

Effect of the Electrolyte Temperature and the Current Density on a Layer Microhardness Generated by the Anodic Aluminium Oxidation Open

Emil Spišák, Miroslav Gombár, Ján Kmeč, Alena Vagaská, Erika Fechová , et al. · 2015

The paper investigates the influence of the chemical composition and temperature of electrolyte, the oxidation time, voltage, and the current density on Vickers microhardness of aluminium oxide layers, at the same time. The layers were gen…

Usage of Neural Network to Predict Aluminium Oxide Layer Thickness Open

Peter Michal, Alena Vagaská, Miroslav Gombár, Ján Kmeč, Emil Spišák , et al. · 2015

This paper shows an influence of chemical composition of used electrolyte, such as amount of sulphuric acid in electrolyte, amount of aluminium cations in electrolyte and amount of oxalic acid in electrolyte, and operating parameters of pr…

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