FMT TU Kosice with the seat in Presov

Prešov, Slovakia

FMT TU Kosice with the seat in Presov

Prešov, Slovakia

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Monkova K.,FMT TU Kosice with the Seat in Presov | Monka P.,FMT TU Kosice with the Seat in Presov
Key Engineering Materials | Year: 2017

The article deals with the influence of WC-Co deposition layer on some properties of steel C45. The coating was obtained by electro spark deposition followed by a laser treatment with three different powers of laser beam. Within experiments the tribological measurements were carried out at which wear resistance and friction coefficient were investigated. The results have shown that the highest coefficient of friction was measured at uncoated steel C45 without laser processing. The micro-hardness has been studied in three various layers of the samples. It can be said that towards the surface micro-hardness is significantly increasing. Maximum value of micro-hardness has shown steel with WC-Co coating, but after laser treatment the micro-hardness slightly decreased. Using point and line analysis, it was possible to find an evidence about mixing of C45 steel with WC-Co coating, i.e. about alloying. Based on results it is possible to say that laser treatment modifies the properties of coats applied in electro spark way along with base material. © 2017 Trans Tech Publications.


Monka P.,FMT TU Kosice with the seat in Presov | Monkova K.,FMT TU Kosice with the seat in Presov | Balara M.,FMT TU Kosice with the seat in Presov | Hloch S.,FMT TU Kosice with the seat in Presov | And 3 more authors.
International Journal of Advanced Manufacturing Technology | Year: 2015

In the article, a design and experimental study of the non-traditional turning tool is carried out and compared to commercial tools. The quality and the efficiency of the machining process is considerably affected by the cutting tools, there being a tendency to look for new non-traditional tools and their geometry. One such tool is a tool with a linear cutting edge. Research into its application towards machining capabilities and its comparison to the classical, mass produced, tools was the goal of this investigation. For this reason, the tools were designed at FMT TU Kosice with the seat in Presov to find new solutions to preserve the tool’s advantages and eliminate its disadvantages. After tool designing, various types of experiments were carried out, dealing with the roughness of machined surface and the turning force. The shapes of the chips and life time of the tools were investigated together with the technological aspects (i.e. feed and speed). Regression analysis and the finitary method of matrix inversion were selected as the methods to interpret the experimental results. The results show that a tool with a linear cutting edge achieves lower values of the surface profile parameter Rz at higher feeds, compared to a commercial tool, which is especially designed to finish the turning operations. On the other hand, from the point of view of energy consumption, the selected commercial tool is more effective. These findings will enable the producer to make a better decision on which type of tool should be used for machining in specific conditions to achieve the best machined surface quality at the required level of energy consumption. © 2015 Springer-Verlag London


Peter M.,FMT TU Kosice with the seat in Presov
Advanced Materials Research | Year: 2013

The paper deals with the experiments realized by means of cutting tool with linear cutting edge not parallel with the axis of the workpiece in order to be observed the suitable values of surface roughness characteristics in dependency on the feed and cutting speed. During experiments were machined three types of steels. Acquired data were statistical processed by regression analysis. The results of the measurements show that the investigated cutting tool enables to secure the same values of surface profile characteristics of steels as a classical cutting tool at finishing with the significant increase of the feed per revolution. It directly influences length of the technological operation time which is several times shortened and so the machining productivity can increase. © (2013) Trans Tech Publications, Switzerland.


Katarina M.,FMT TU Kosice with the seat in Presov | Sergej H.,FMT TU Kosice with the seat in Presov
Advanced Materials Research | Year: 2013

The aim of the paper is to find the dependency of tool life on the cutting speed at investigation of two selected tools with linear cutting edge not parallel with the workpiece axis. The tools differ in their geometry. Conditions of experiments, used equipments and some problems, which are necessary to solve from the standpoint of machining technology with regard to tools are described in the article, too. The experimental obtained data were statistical processed by the method of regression analysis. The results are arranged into the graphical presentation, which enables the comparison of tool life at the same cutting speed and consequently the choice of the most suitable geometry of tool at the machining in specific conditions. © (2013) Trans Tech Publications, Switzerland.


Monkova K.,FMT TU Kosice with the seat in Presov | Monka P.,FMT TU Kosice with the seat in Presov
Advanced Materials Research | Year: 2013

The article deals with the influence of the laser melting process on the surface roughness characteristics of the coat deposited on material by electrospark way granted by KEGA 035TUKE-4/2011 project of Ministry of education of Slovak republic. The aim of the article is research of material properties after coating by WC-Co and laser treatment. As the research method were used experiments and tools of statistics. Experiments were carried out on WC-Co coat (the anode), which was deposited on C45 carbon steel (the cathode) and molten by a laser beam. After surface treatment were analysed of changes in surface structure of the coat. Results of the research shows influence of parameters of this process to roughness, tribologic properties and morphology of the surface layer prepared by WC-Co coating and laser treatment. © (2013) Trans Tech Publications, Switzerland.

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