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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 105
Habrman, Martin , Chval, Zdeněk , Ráž, Karel , Kučerová, Ludmila , Hůla, František
Injection Moulding into 3D-Printed Plastic Inserts Produced Using the Multi Jet Fusion Method

Most injection-moulded plastics are injection moulded into moulds made from conventional materials such as steel or aluminium. The production costs of the mould are considerable. 3D printing from plastic can be used for injection moulds to save these costs. This article deals with ...

Dewa, Rando Tungga , Kepka, Miloslav
Improved extrapolation method for the fatigue damage of bus structural steel under service loading

This paper shows a technical study and analysis of the fatigue damage assessment of bus structural steel under service loading. Two bus prototypes (passenger-loaded and empty) are used in the experimental measurement for a typical city road. A deterministic analysis is performed for...

Bublíková, Dagmar , Jirková, Hana , Stehlík, Adam , Jeníček, Štěpán
Effect of Temperature and Deformation on the Stability of Retained Austenite in Closed-die Forgings from High-strength Martensitic Manganese-silicon Steels

In advanced steels, retained austenite is an important phase in the final microstructure, which provides a favoura-ble combination of strength and ductility. Advanced methods capable of achieving this include the Q-P process (Quenching and Partitioning). By this means, strength of around 200...

Ježdík, Roman , Kemka, Vladislav , Kovanda, Jan , Lopot, František , Purš, Hynek , Hájková, Barbora
Various Approaches to Reduce Consequences of Pedestrian-Tram Front End Collision

Safety of rail vehicles is an important feature of sustainable public transport. Proofs of an effort in that area are new recommendations and regulations from the expert commission (WG2 of the Technical Committee CEN / TC 256) regarding trams and light rail vehicles aimed ...

Leták, Radek , Jirková, Hana , Kučerová, Ludmila , Jeníček, Štěpán , Volák, Josef
Effect of Forming and Heat Treatment Parameters on the Mechanical Properties of Medium Manganese Steel with 5% Mn

Medium manganese steels fall into the category of modern third-generation high-strength steels. Thanks to their alloying, they use a number of strengthening mechanisms, such as the TRIP and TWIP effects, to achieve their mechanical properties. The excellent combination of strength and ductil...

Böhm, Michal , Niesłony, Adam , Derda, Szymon , Owsiński, Robert , Kepka, Miloslav , Zetková, Ivana , Zetek, Miroslav , Houdková, Šárka , Prażmowski, Mariusz
General Reference and Design S-N Curves Obtained for 1.2709 Tool Steel

At present, due to advanced fatigue calculation models, it is becoming more crucial to find a reliable source for design S–N curves, especially in the case of new 3D-printed materials. Such obtained steel components are becoming very popular and are often used for important pa...

Řehoř, Jan , Fulemová, Jaroslava , Kutlwašer, Jan , Gombár, Miroslav , Harničárová, Marta , Kušnerová, Milena , Vagaská, Alena , Povolný, Michal , Valíček, Jan , Zatloukal, Tomáš
ANOVA analysis for estimating the accuracy and surface roughness of precisely drilled holes of steel 42CrMo4 QT

The presented publication is focused on increasing the productivity and efficiency of machine production of precision holes. Considerable attention was paid to the influence of the pre-preparation and drilling technology on the quality of the reamed hole. The material selected for machining&...

Marek, Václav , Křížek, Michal , Kavalír, Tomáš
Study on cooling of high performance SIC features

High-performance electronic parts are vital features in almost all modern motorized machines. These silicon components are significantly minimised, especially in transportation branch. Concentration of performance requires perfect cooling conditions. A fluid flow cooling by an active cooling circuit with&#...

Habrman, Martin , Chval, Zdeněk , Ráž, Karel , Streit, Philipp , Stümpfl, Dominik
Preventing flash occurrence in the injection plastic mould

This article deals with the injection moulding into the plastic mould. This is an unconventional approach to injection moulding, especially because the 3D printing is used to produce the mould. The mould with the same shape was made of a conventional material (aluminium) for c...

Nozar, Martin , Rosenthal, Jakub
Print speed and its importance for metal additive manufacturing

The article deals with issues which occur when using different types of basic print speeds in metal additive manufacturing. It describes their importance, mutual relationships and their influence on the quality of pieces manufactured using this technology. The ability to manage the spee...

Ráž, Karel , Chval, Zdeněk , Štěpánek, Martin , Vyhnal, Ondřej
Mechanical Analysis of the Newly Developed 3D Printed Prosthetic Socket from PA12GB

This paper is focused on the complex evaluation of the prosthetic socket (of a hand) manufactured by the usage of additive technologies. Main advantage of this method is a significantly shorter production time and lower production cost. The durability of the socket is generally...

Řehoř, Jan , Gombár, Miroslav , Harničárová, Marta , Kušnerová, Milena , Houdková Šimůnková, Šárka , Valíček, Jan , Fulemová, Jaroslava , Vagaská, Alena
Investigation of machining of Stellite 6 alloy deposited on steel substrate

The present paper brings an insight to face the machining of hard coatings (Stellite 6) prepared by thermal spraying technology. The objective of the paper is to evaluate the influences of machining parameters on the surface of Stellite 6 deposited on steel substrate by the&#x...

Kindl, Vladimír , Kavalír, Tomáš , Sika, Jiří , Hnátík, Jan , Křížek, Michal , Frivaldský, Michal
Wireless Power Transmission System for Powering Rotating Parts of Automatic Machineries

This paper deals with the analysis of a suitable compensation topology of a wireless power transmission system for powering the rotating parts of modern automatic machine tools. It summarizes the important properties of the serio-parallel compensation topology suitable for this application a...

Jeníček, Štěpán , Opatová, Kateřina , Kučerová, Ludmila , Vorel, Ivan
The Progress of Bainitic Transformation during Austempering in Connection with the Alloying of Unconventional AHS Steels

It is well known that incomplete bainitic transformation during austempering treatment is mainly caused by the supersaturation of austenite with carbon. Such supersaturated austenite becomes more stable and further stabilization is led by silicon alloying. Stable austenite does not transform and&...

Kučerová, Ludmila , Jeníček, Štěpán , Zetková, Ivana , Burdová, Karolína
Heat treatment of bimetals produced by selective laser melting of MS1 maraging steel on conventionally produced 42SiCr martensitic steel

One approach to producing hybrid bimetallic parts is to additively manufacture a new material onto a conventionally manufactured base material. This technique can expand the potential applications of additive manufacturing and offer new solutions for the engineering design of hybrid parts. I...

Kottner, Radek , Sedláček, František , Jahodník, Ondřej
Stabilizing legs with possibility of loss of stability to protect glass fibre reinforced polymer tank

This work focuses on the optimization of the stabilizing legs of a Glass Fibre Reinforced Polymer under- ground tank. More specifically, the aim was to find a structure of the legs that compensates for the pos- sible failure of the tank when it is filled after being&...

Kučerová, Ludmila , Burdová, Karolína , Jeníček, Štěpán , Volkmannová, Julie
Microstructure and Mechanical Properties of 3D Printed Tool Steel after Various Precipitation Hardening Treatments

Precipitation hardening is one of the most frequently used methods of the post-processing heat treatments of 3D printed tool steel 1.2709, as it increases the yield and ultimate tensile strengths of the steel. Within this work, the broad temperature range of 250°C – 550°C was&...

Hájek, Jiří , Nový, Zbyšek , Kučerová, Ludmila , Jirková, Hana , Salveter, Pavel , Motyčka, Petr , Hajšman, Jan , Bystrická, Tereza
A New Alloying Concept for Low-Density Steels

This paper introduces a new alloying concept for low-density steels. Based on model calculations, samples—or “heats”—with 0.7 wt% C, 1.45 wt% Si, 2 wt% Cr, 0.5 wt% Ni, and an aluminium content varying from 5 to 7 wt% are prepared. The alloys are designed to obtain st...

Jirková, Hana , Opatová, Kateřina , Kučerová, Ludmila , Zetková, Ivana , Jeníček, Štěpán , Burdová, Karolína
Effects of heat treatment on microstructural evolution in additively-manufactured parts of various heights from maraging steel

Parts made by 3D printing must be subjected to heat treatment to achieve the required mechanical properties. With the development of additive manufacturing in various areas of industry, more and more complex components are being printed, which, in addition to their complicated shape,&#x...

Lee, Seungjong , Shao, Shuai , Wells, Douglas N. , Zetek, Miroslav , Kepka, Miloslav , Shamsaei, Nima
Fatigue behavior and modeling of additively manufactured IN718: The effect of surface treatments and surface measurement techniques

In this study, the effect of various surface treatments, including sand-blasting, drag-finishing, turning, grinding, and grinding + drag-finishing, on surface roughness (SR) and fatigue properties of laser beam powder bed fused Inconel 718 was examined. SR values obtained from two surface me...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 105