DREPO UNIZA
Digitálny repozitár Žilinskej univerzity
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Technológ - celé číslo 2/2025
(University of Žilina, 2025)
Vplyv geometrie reznej hrany na tvorbu triesky a zložky reznej sily
(University of Žilina, 2025) Mičietová, Anna; Čilliková, Mária
This paper deals with influence of cutting edge geometry on chip formation and components of cutting force components. The insert with the flat surface is compared with the insert containing positive geometry in order to produce acceptable chip form. It was found that cutting forces components are lower for the insert having positive geometry together with the lower energy consumed for chip formation. Furthermore, the acceptable chips in the form of short sequence is developed as contrasted against the insert of flat surface producing long chips. The measured cutting force components are decomposed in order to distinguishes between the components associated with chip formation and energy consumed in the produce new surface. Chip ratio for the flat insert is more and the shearing angle is therefore less.
Giga casting ako technologická revolúcia vo výrobe automobilov
(University of Žilina, 2025) Bolibruchová, Dana
Giga casting is referred to as a technological revolution in automobile manufacturing. Large aluminium castings are increasingly used for the production of automotive vehicles, especially for electric vehicles with low weight and to reduce production costs. Since most of them are structural components loaded quasi-statically, dynamically and cyclically, the quality and quantifiable performance of extremely large aluminium castings is crucial for their production. This article briefly analyses the current state of the art in the field of giga castings, some examples of their use in the automotive industry, their benefits and advantages.
Opotrebenie strižníkov a ich ostrenie
(University of Žilina, 2025) Moravec, Ján; Melo, Borislav
The paper focuses on the issue of shear wear. Theoretical foundations are presented and an analysis of the issue of sharpening the active parts of the shear tool is also described. Sharpening the shears themselves is an important part of repairing shear tools and their required starting position before setting them on the press.
Analýza stavu povrchu po shot peenovaní duplexnej ocele AlSi 318
(University of Žilina, 2025) Neslušan, Miroslav; Florková, Zuzana
This paper deals with surface integrity and the corresponding stress state as well as surface topography after shot peening of duplex steel AlSi 318 under the variable shot-peening conditions such as number of passes and applied air pressure. It was found that the energy of shot impacts is consumed mainly by austenitic phase whereas the ferritic one is less affected. High magnitude of residual stresses is developed under the higher number of cycles as well as for the higher media pressure. Amplitude of compressive residual stresses in austenite is more as that for ferrite one. Surface roughness is decreasing along with the number of shot peening cycles and the typical crater-like surface is produced.