Konferenční příspěvky / Conference Papers (RTI) Collection home page

Browse
Subscribe to this collection to receive daily e-mail notification of new additions RSS Feed RSS Feed RSS Feed
Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 28
Jirková, Hana , Opatová, Kateřina , Wagner, Martin F.-X. , Mašek, Bohuslav
Physical Simulation of Press Hardening of TRIP Steel

Deformation-induced martensitic transformation is used for improving mechanical properties of AHS steels which contain metastable retained austenite. TRIP steels are one of the categories that fall into this group. Their microstructures consist of proeutectoid ferrite, bainite, and metastable retained ...

Garan, Martin , Chmelko, Vladimír , Schafer, Ervin
Safety margin against the fatigue fracture under random loading

The fatigue lifetime of the structure in operation is express in the number of working cycles, kilometersor time depending units. By harmonic process of loading is possible to express the safety margin as reserve against the required lifetime in the form of number cycles or&#x...

Špirk, Stanislav , Křížek, Michal , Jeníček, Štěpán
Polyurethane foam behaviour during impact

This contribution is focused on the passive safety of the railway vehicles interiors. The passive safety has become a new area of the rail vehicles design. In the field of rail vehicles interior passive safety the computer simulations are most widely used. The computer simulat...

Kubátová, Dana , Melichar, Martin , Kutlwašer, Jan
Methodology for selecting software filters

The development of measurements and the evaluation of the surface structure has been marked by significant qualitative technical progress in recent years. Leading manufacturers of measuring technology (Hommel CS s.r.o., Carl Zeiss, Ltd., etc.) actively responded to new requirements. The developme...

Ráž, Karel , Zahálka, Martin
Viscosity testing of plastic material PA6 with 15% of glass fibers

The main aim of this paper was to describe the viscosity and injection mold filling behavior of PA6 with 15% of glass fibers. Injection molding is one of the most widely used processes for polymer products. The quality of these products is directly linked to correct ...

Zetková, Ivana , Jeníček, Štěpán , Hronek, Ondřej , Kotěšovec, Vratislav , Vrtáček, Jiří , Zetek, Miroslav
Influences of cutting process parameters on the cutting quality when water jet cutting

The article analyses unconventional technology of water jet cutting and its impact on the cutting quality. A series of experiments were done to determine the effects of the used materials and their cut thickness on the final surface integrity, within the experimental program. Steel...

Stehlík, Adam , Vrtáček, Jiří , Peković, Michal , Jeníček, Štěpán
Measurement of phase transformation temperatures under near-real conditions using a thermomechanical simulator

Phase transformations are normally studied under standard conditions using dilatometers and very small volumes of material. These conditions are given by historical definitions and do not fully correspond to real-world industrial processes any more. Transformation diagrams are a typical example h...

Janda, Tomáš , Jirková, Hana , Jeníček, Štěpán
Comparing properties of the 42SICR steel after conventional heat treatment and QP processing

To improve the mechanical properties of high strength steels the application of innovative methods is often necessary. One of such technology used in the field of heat treatment (HT) is the quenching and partitioning process. By this method higher content of stabile retained austen...

Ráž, Karel , Chval, Zdeněk , Polák, Roman
Influence of runner angles on balanced filling for multicavity moulding

This paper deals with the influence of runner angles on the balanced filling of a three-cavity mould during injection moulding. The main goal of the study is to understand the influence of the angles between the runners and the balanced filling of the three individual par...

Kubátová, Dana , Melichar, Martin
Effect of scanning speed when measuring surface roughness

In the field of practical metrology it is extremely important not only accuracy but also the measurement of measuring productivity activities which entail considerable costs. Within this article, was tested the influence of the velocity for measuring of roughness. Test was made in ...

Chval, Zdeněk , Ráž, Karel , Kalina, Tomáš
Thermal analysis of the forging press LZK 4000

Thermal loading of mechanical forging press is one of the most important factors which are influencing its function and final accuracy of forgings. It is necessary to eliminate deformations caused by thermal loading of all main parts such as ram and frame. This is done ge...

Janda, Tomáš
Measuring and evaluating the prior-austenite grain size of high-strength steel

The prior-austenite grain size significantly influences the refinement of the martensitic microstructure and therefore the mechanical, electrical and magnetic properties of a material. The accurate determination of the prioraustenite grain size is therefore very important and is a principal task ...

Bícová, Kateřina , Milsimerová, Aneta
Contribution to monitoring and analysis of manufacturing processes in the automotive industry

With increasing demands on product precision and all services, monitoring and analysis of key processes becomes a key issue. This paper presents the issue of monitoring and evaluation of the automotive manufacturing process, where production precision is the main attribute. The objective...

Nozar, Martin , Zetková, Ivana , Hronek, Ondřej
Searching for favourable powder bed fusion settings in sintering of maraging steel MS1

Additive manufacturing (AM), also known as 3D printing, enables the creation of complex shapes and structures virtually unattainable by classical production processes. This modern manufacturing technology includes metal additive technologies that are use metal powder for producing prototypes or parts&...

Jeníček, Štěpán , Kotěšovec, Vratislav , Kalina, Tomáš , Opatová, Kateřina
Design of heating equipment for moulding organic polymer-based composites

Polymer composites are materials whose importance and scope of applications are growing continuously. Where permitted by the service conditions, conventional materials tend to be substituted with composites. Another common trend seen today is to minimize or eliminate adverse impacts of manufactur...

Khalaj, Omid , Jirková, Hana , Mašek, Bohuslav , Svoboda, Jiří
Microstructure evaluation of new ODS alloys with Fe-Al matrix and Al2O3 particles

ODS steels are used for their very good mechanical properties at high temperature and low-cost production in comparison with other super alloys (ex. nickel super alloys). The paper describes a new group of Fe-Al Oxide Dispersion Strengthened (ODS) alloys with fine Al2O3 precipitates.&#x...

Kepka, Miloslav , Kepka, Miloslav
dentification of possible causes of fatigue failure in radius rod pins for trolleybus rear axles using parametric calculatins of fatigue life

Fatigue failures were frequently encountered in the pins of radius rods of driving axles of trolleybuses in city of San Francisco. Sufficiently representative stress-time histories for the critical cross section through this part were obtained by measurement carried out during rides with...

Jandová, Andrea , Kučerová, Ludmila , Rubešová, Kateřina
Heat treatment with bainitic hold of CMnSiAI steel

TRIP (transformation induced plasticity) steel are modern structural materials which are currently mainly used in an automotive industry. The processing of these steels utilize an effect of transformation induced plasticity resulting in good mechanical properties - high strength (up to 1200 ...

Jirková, Hana , Bublíková, Dagmar , Opatová, Kateřina , Volkmannová, Julie
The influence of niobium on the resulting structure of trip steels during the continuous cooling

High strength multiphase TRIP steels are very often used as structural materials, especially in the automotive industry. Due to their ability to absorb energy during the impact, they are used for safety components of the car body. These parts can be produced by a hot stam...

Vostřák, Marek , Houdková Šimůnková, Šárka , Zetek, Miroslav , Hruška, Matěj
Prolonging lifetime of milling tools by laser cladding of wear resistant coatings

The tools used for milling and grinding can have a limited lifetime due to excessive wear. Their lifetime can be prolonged by application of suitable coatings. Highly wear resistant coatings can be easily applied by means of laser cladding. The goal of this study is to&#x...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 28