The production technology in Ph.D study involves foundry and machining technologies, quality management and metrology, forming technology, welding and surface treatment technologies, inclusive of automation of the preparation of production as well as automation of manufacturing processes employing the above technologies. During their studies the students will get a profound knowledge of applied methematics, physical metalurgy, theory of experiments and optimization of technological processes in particular together with other theoretical and practical information closely related to the chosen field.

prof. Ing. Ladislav Zemčík, CSc.

1. Analysis of Physical and Technological Propertis of Superhard Coatings for Machining

   The main focus and goal of the scientific work will be a study of fundamental physical hard coating properties first, describing their resistance to complex loading when machining. In the second period, a FEA model will follow, reflecting measurement and testing of the real materials/cutting tools and predicting the intensity of wear and other phenomena. In the third part, a verification of the model regarding sort of substrate, its geometry, dimensions, state of material interface, kind of coatings, its dimensions and other qualitative parameters for en-hanced cutting performance will be done. Taking into consideration of the frequent use of coatings in the industry, consumption of cooling fluids, etc. the expected solutions might will have an use in optimisation of coating technologies and applications.

   Tutor: Píška Miroslav, prof. Ing., CSc.

2. Application of modern technologies for production of complex shape surfaces

   Research and development of technologies for special-purpose shell components which could be used as bone replacement or implants. The aim of research is to propose a technology of prototypes creation with support of reverse engineering, rapid prototyping and CAD/CAM. Technology could be potentially applied in orthopaedics and surgery for special trauma cases. Significant contribution of this research may lie in a lesser incision into patient body, reduction of femur bone cutting, considerable preservation of own bone material and reduction of the time and costs in the operation.

   Tutor: Sedlák Josef, doc. Ing., Ph.D.

3. Influencing the structure of steel ingots by controlled convection of the melt during solidification

   Material for the production of steel ingots and castings is nowadays often manufactured by processes of secondary metallurgy which enable to achieve high material purity from the point of view of inclusions. But in the gist of the matter this often leads to the formation of coarse primary structure and defects related to macrosegregation of some elements contained in steel. The work is aimed at studying the influence of controlled convection of the melt during solidification of a steel ingot on the growth of dendritic network and the resulting primary structure and segregations in the steel ingot. The controlled convection of the melt results from the use of the circulating magnetic field or electromagnetic induction.

   Tutor: Záděra Antonín, doc. Ing., Ph.D.

4. Ion conductivity of oxides and their reaction with molten alloys

   During the melting procedure of alloys containing elements with great affinity to oxygen their reaction with the oxides of linings is observed. During these heterogeneous reactions the transport of reactive substances to the phase interface plays the significant role. Under high temperature at some oxides the ion conductivity is detected, and movement of the oxygen ions is accompanied by measurable inner-to-outer side of melting cup voltage. This work will be aimed on monitoring of this voltage change during the melt-ceramics reactions and examination of possibilities their blocking by the voltage opposite polarity.

   Tutor: Zemčík Ladislav, prof. Ing., CSc.

5. Micro-machining at CNC machines

   Modern technologies of so-called micro-machining are very frequently asked machining operations at modern CNC centres. Micro-machining has been used in aerospace applications for many years but it is only recently that the toolmaking industry has shown similar interest. The main advantage of multiaxis machining is the ability to save time by machining complex shapes in a single set-up. Additional benefit comes from allowing the use of shorter cutters that permit more powerful and more accurate machining.This sort of machining needs more resistant cutting tools working in heavy conditions of loading. Significant help can be use of super-fine substrate materials, very hard and wear resistant coatings based on nano-crystalline structures and intensive cooling. The aim of the work will be speciafication of the new technologies, applied material research of coating technologies for this kind of machining and optimisation of process fluids.

   Tutor: Píška Miroslav, prof. Ing., CSc.

6. Progressive technologies of five axes machining at machining centres

   Modern technologies of 5-axis machining are very frequently asked machining operations at modern CNC centres. 5-axis machining has been used in aerospace applications for many years but it is only recently that the toolmaking industry has shown similar interest. The main advantage of 5-axis machining is the ability to save time by machining complex shapes in a single set-up. Additional benefit comes from allowing the use of shorter cutters that permit more powerful and more accurate machining.

   Tutor: Píška Miroslav, prof. Ing., CSc.

7. Progressive technologies of four-axis machining at two-spindle CNC machining centres

   Modern technologies of 4-axis continuous machining are very frequently asked operations at double spindle CNC machining centres. These operations belong to the most complicated regarding structures of the programmes, tool selection and quality assessment. 4-axis machining is used in manufacturing industry for many years, but its significance is rapidly growing for production of rotational parts in one rmachining routine. Main advantage of 4-axis machining is the ability to save production time with machining of complex shapes with a single fastening and automatic re-holding. Other advantages can be an use of driven tools (drills, milling cutters, grinding tools) that allows an powerful machining with high quality of machined surface.

   Tutor: Píška Miroslav, prof. Ing., CSc.

8. Study of the efefects of deformation rate and temperature parameeters on formability of Al alloys

   On selected Al alloys, which are used in the manufacture of components for the chemical, aircraft, and nuclear power industries, the non-uniformities of the distribution of deformations and structural changes shall be assessed, and the effect of increased temperatures and deformation rates on the formability of these alloys shall be evaluated. Constitutive equations for the stress-strain curves will be written as materials models to be used in the calculation models of current software programs

   Tutor: Forejt Milan, prof. Ing., CSc.

9. testing of cutting tools for multi-axis machimnig at machining centres

   Modern technologies of multiaxis machining are very frequently asked machining operations at modern CNC centres. Multiaxis machining has been used in aerospace applications for many years but it is only recently that the toolmaking industry has shown similar interest. The main advantage of multiaxis machining is the ability to save time by machining complex shapes in a single set-up. Additional benefit comes from allowing the use of shorter cutters that permit more powerful and more accurate machining.This sort of machining needs more resistant cutting tools working in heavy conditions of loading. Significant help can be use of super-fine substrate materials, very hard and wear resistant coatings based on nano-crystalline structures and intensive cooling. The aim of the work will be speciafication of the new technologies, applied material research of coating technologies for this kind of machining and optimisation of process fluids.

   Tutor: Píška Miroslav, prof. Ing., CSc.

10. The limiting strain of carbon steels in cold bulk forming

    The selected low-carbon steels, which are used for forming the coupling parts volume and machine parts, to assess their plastic and structural changes at high deformations and limit the influence of strain rate. Create a constitutive equation for stress-deformation curves with the limiting conditions limit deformation.

    Tutor: Forejt Milan, prof. Ing., CSc.