Jan Valíček

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Preliminary note An analytical derivation for the velocity parameters of elements of a hydrodynamic acoustic flow oscillating system, namely the liquid flow velocities, the mean values of liquid oscillation velocities and the phase velocity of acoustic wave were presented in this paper. There are also presented results of indirect measurements. The stated(More)
Prikaz stanja Rapidly expanding industry, along with its increasing requirements for production quality, demands continual implementation of technologies that meet demanding criteria given by market environment and its requirements [12, 13, 14, 15]. Today, the production technologists encounter the need to adapt the existing technologies for the specific(More)
Original scientific paper Usages of non-traditional machining processes are rapidly increasing together with increases in demand and usage of high strength, temperature resistant and complex materials. Due to their advantages such as cutting speed, surface quality and economizing, they became a vital process of manufacturing. Because of the conflicting(More)
2 3, 4 The development of new materials with specific features requires the continual technologists' focus on their possibilities of machining. They encounter a need to develop new technologies which are adequate for machining those new materials. The abrasive water jet cutting technology is one of these technologies. The abrasive water jet is currently the(More)
184 Non-Contact Method for Surface Roughness Measurement After Machining J. Valíček, M. Držík, T. Hryniewicz, M. Harničárová, K. Rokosz, M. Kušnerová, K. Barčová, D. Bražina 1 Institute of Physics, Faculty of Mining and Geology, VŠB Technical University of Ostrava, 17. listopadu 15/2172, 708 33 Ostrava-Poruba, Czech Republic, corresponding author:(More)
In the paper, the Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDS) and X-ray Photoelectron Spectroscopy (XPS) results of the surface layer formed on pure titanium after plasma electrolytic oxidation (micro arc oxidation) at the voltage of 450 V are shown. As an electrolyte, the mixture of copper nitrate Cu(NO₃)₂ (10-600(More)
The paper solves the problem of the nonexistence of a new method for calculation of dynamics of stress-deformation states of deformation tool-material systems including the construction of stress-strain diagrams. The presented solution focuses on explaining the mechanical behavior of materials after cutting by abrasive waterjet technology (AWJ), especially(More)
Experimental study of a titan grade 2 surface topography prepared by abrasive waterjet cutting is performed using methods of the spectral analysis. Topographic data are acquired by means of the optical profi lometr MicroProfFRT. Estimation of the areal power spectral density of the studied surface is carried out using the periodogram method combined with(More)
exhibit by defects, which occur as late as in the process of forging. Prediction of such defects would enable a fast intervention and thus reducing costs for the reparation. Statistically was proven, that the defects are not caused by exceeding of any measured parameter in the production. However, they are caused by an unsuitable combination of more(More)
Klasifi kacija tehničkih materijala prema klasama obradivosti kod hidroabrazivnog rezanja. U radu su prezentirana temeljna znanja, razmišljanja i rezultati teorijskih rješenja vezano uz trenutne procijenjene suvremene potrebe za hidroabrazivnom tehnologijom rezanja. Ovdje je i ponovo otvoreno pitanje trenutne terminologije u području mjeriteljstva topografi(More)