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Original title in Czech: Strojírenská technologieFSIAbbreviation: D-STGAcad. year: 2010/2011
Programme: Manufacturing Technology
Length of Study: 4 years
Accredited from: Accredited until: 1.3.2012
Profile
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.
Guarantor
prof. Ing. Ladislav Zemčík, CSc.
Issued topics of Doctoral Study Program
Theoretical models for machining are simplified frequently and many times these calculations are followed by over-dimensioning of the main machine parts. That results in higher consumption of electric energy, price of machine, higher needs of cooling and lubricating means. The basic calculation is simple and analogical to the limit strength of materials. The calculations of real chip cross-sections (general trochoids, un-developable surfaces) are included in a limited numbers of works. That time is typical for measurement by analogical devices with high reading error for local extremes, so the tables include unusable data, especially for hardened steels, composite materials, HSC technologies, etc. New knowledge will contribute moreover to modern machine part description, optimisation of support unit regulations, mathematical analyses of real chip cross-sections as function of real support feeds, its speeds, accelerations, etc.
Tutor: Píška Miroslav, prof. Ing., CSc.
Long-time trends in theory of cutting includes the explicit FEM use for simulation of cutting processes from many reasons - analyses of chip production, studies of integrity of machined surfaces, prediction of catastrophic tool wear, resp. finding of its stress risers. This research work will extend the successful series of origin scientific papers (CIRP), which have been focused on orthogonal turning and face milling and will be enrich other technologies - drilling and reaming namely. Those technologies are widely used in practise and studied in our IMT.
Tutor: Zouhar Jan, Ing., Ph.D.
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.
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Tutor: Rumíšek Pavel, doc. Ing., CSc.
The research work deals with final technology project and its simulating verification. Complex technology projects need very often also preliminary timing and production analysis for coordination of the connected intra-plants activities. The verification of the real technology project can realize by using of different simulating programs - for verification of the project, solved in this Ph.D. work will be use the simulating program "Witness", which contains also all modern and progressive methods for material flow analysis and also possibility to identificate all critical points in the production steps.
Thin-walled tubes of different profile shape, especially noncircular cross section tubes are increasingly used in so-called "lightweight" structures. Examples are increasing applications in the automotive industry and aircraft construction. Pipes provide a high ratio of strength to weight, shape accuracy and rigidity. Carrier technology is shaping the bend, which is often accompanied by the occurrence of defects in the form of a wave of internal radius, deformation cross section or inadmissible thin of the wall. New technology is explored ways to predict or suppression of their beginning. The aim of the dissertation is the definition of critical parameters of the bending of thin-walled tubes of circular cross section and noncircular cross section, taking into account the formability of the source material. It is expected the implementation of experiments and their subsequent comparison with theoretical knowledge.
Tutor: Samek Radko, prof. Ing., CSc.
Permanent pressure on manufacturing expenses and reduction of manufacturing costs and global economy trends lead to modern technologies and tools using HSC (High Speed Cutting), HFC (High Feed Cutting) and HPC (High Performance Cutting). The technologies meet the criteria and reduction of cooling fluid in production. The main subject of the research work will be a study of force loading and thermal impact on cutting tools, work-pieces and machine parts, including of a study analysing the wear of cutting tools, integrity of machined surfaces and temperature deformations of machine parts.
Tutor: Polzer Aleš, Ing., Ph.D.
In spite of the prognoses in the end of 20th century dealing with substitutions of HSS with other cutting materials these steels stays nowadays as standard and frequently used in machining. The new R&D trends gather powder metallurgy, PVD coating and reduction of expensive elements (W,V). However, good machinability of the steels by grinding (compared to cemented carbides, cermets and ceramics) stipulate new ideas and research in new cutting geometries with a better cutting performance of major and minor cutting edges and it us used for a better breaking and separation of material in the chip formation, force loading, etc. This scientific work deals with a research in the field and optimization of the cutting geometry and coating process for roughing technologies, used not only for cast and wrought blanks, but and Ti and Ni alloys where is a problem to achieve some satisfactory results with HSC technologies.
The research work deals with a cutting performance study of band saws, especially the high productive ones, where the cutting edges are made from cemented carbides. The cemented carbides can be protected with PVC (Ti,Al,)N/C coatings and arc technology, so higher surface hardness can be achieved. However, a deterioration of subsurface layers can be found, accompanied with worse roughness or coating delamination. This study could be useful for an optimisation of coating regimes and enhancement of band saws cutting performance. Some other phenomena will be studied and analyzed by standard statistical methods.
Recently, many research works (WASSENAAR, E.B., FRANSSEN, B.B.G.M., VAN EGMOND, D. B SCHUURMAN, F. and KON, M.) are dealing with an idea of hammering of so-called Kirschner wires instead of standard way of drilling. Despite the fact that our research workplace has wide and positive experience with drilling (high precision of aiming, roundness and cylindricity of the hole as supportive place, absence of the radial cracks, no extensive research to the hammering has been verified and evaluated. Looking to the frequent use of the K-wires in surgery and orthopaedics that topic is highly interesting to study.
The work targets firstly on the measuring of parameters which are used as enter data when modeling technological process of deep drawing and secondly on determination of reliability of their valuation. The next part of the work is devoted to understanding how the changes of the enter parameters influence the results of the simulation. The results of simulations will be compared with experimental values and as the final result will be a practical recommendations for using of studied enter parameters in computer simulation of deep drawing technological process together with the evaluation of values reliability.
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.
The quality of final castings made by investment casting technology (lost wax) is depended especially on the choice of optimal technologies connected both with the preparation of the molten metal and also with the ceramic shell into which the molten metal is being poured. Priority in this technology is the making a perfect wax pattern followed by ceramic shell. The main objective of this PhD thesis should be optimizing the individual phases of the process to achive minimum scrap rate in final castings.
Tutor: Horáček Milan, prof. Ing., CSc.
On selected dual-phase bake-hardening steels, which are used in the manufacture of automobile components, 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 evaluated. Constitutive equations for the stress-strain curves shall be written as materials models to be used in the calculation models of current software programs.
Tutor: Forejt Milan, prof. Ing., CSc.
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
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.
For substitution of knee and hip joints it is possible also to use a combination of rapid prototyping technology FDM (available at the Institute of manufacturing) in combination with the technology of lost wax pattern. Very important factor in replacing of these human body parts is their quick manufacturing "fit on purpose", i.e. with exact dimensions of the parts suitable for the person in need. The main objective of this topic should be the optimizing of the manufacturing parameters when producing the wax pattern of the part.
Study plan wasn't generated yet for this year.