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Suitable lubricants for deep drawing of stainless steel
Doležal, Jan ; Chudík, Ivan (referee) ; Lidmila, Zdeněk (advisor)
This thesis solves problems of design and construction of testing equipment for testing lubricants for deep drawing and experimental evaluation of suitability of different types of lubricants for specified tests conditions. Most of all it is about finding environmentally friendly lubricant which would provide similar results as lubricants containing chlorine compounds when drawing a stainless austenitic Cr-Ni steel 1.4301. As for lubricants provided for testing by leading home and abroad manufacturers, the ATLAS 3374-140 from Quaker Chemical and the WISURA ZW 3356 from FUCHS, were evaluated as the most suitable environmentally friendly lubricants.
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Experimental Study of the Efect of Lubricants on Rolling Contact Life
Šembera, Václav ; Ficza, Ildikó (referee) ; Nohál, Libor (advisor)
The aim of this bachelor’s thesis is to summarize the art of state in the area of the contact fatigue, lubricants and detection of the rolling contact fatigue exploiting the acoustic emission method. In the experimental part of this bachelor’s thesis are performed the rolling contact testing for the standard grease and the lubricant with EP additives by marginal exploiting the acoustic emission method. The effect of the lubricants on the rolling contact life is evaluated by basic rating life L10 stated by using Weibull distribution.
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Reologický profil motorového oleje používaného ve čtyřdobých pístových motorech
Kumbár, Vojtěch
This dissertation deals with rheological and flow behavior of engine oil used in four-stroke piston engines. Experiments were performed using some selected oils used in motorcycles, cars and agricultural machinery. Samples of used oil were collected and analyzed. The following parameters were measured: time-dependence of dynamic viscosity and shear stress of engine oils, the dependence of shear stress on the shear rate of engine oil, temperature dependence of engine oil density and temperature dependence of dynamic and kinematic viscosity of engine oil. To evaluate the degree of degradation of analyzed engine oils, the measured results were compared with data concerning new, (non-used) motor oil of the same trademark and specification. Thereafter, mathematical models were elaborated using the results obtained in individual measurements. Correlation coefficients and coefficients of determination existing between measured and calculated values were calculated and evaluated. Elaborated mathematical models can be used when predicting the behavior of engine oils and liquids with similar rheological characteristics.
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Consumer competition in the car workshop segment
Brož, Jan ; Vávra, Oldřich (advisor) ; Kozák, Petr (referee)
This paper deals with description and evaluation of the specific consumer competition implemented by OMV Česká republika, s.r.o. First part is devoted strictly to theory like consumer competition's place within the marketing mix, legal arrangements and tax aspects of the consumer competitions. Practical part commences with introduction of the company OMV Česká republika, s.r.o., continues with analysis of the Czech lubes market and short excursion to European legislation in the field of lubes. Furthermore, the paper introduces EPG (Engine Protection Guarantee) programme implemented by OMV Česká republika, s.r.o., the consumer competition used as support of this programme and also marketing support of the consumer competition. At the end, the paper is evaluating the whole consumer competition.
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