Abstract. Using of cutting inserts is currently a normal part of the manufacturing process. The article deals with the tool wear evaluation of selected inserts for turning by electron microscopy. Use of electron microscopy helps closer analysis of machining consequences for these plates, because the microscope images captured with the electron microscope have a greater depth of sharpness and can display the examined object with greater plasticity. It is another way to explore objects and extends the possibilities for obtaining large quantities of information. Electron microscopy is possible to be used for getting better information about toolwear after machining, for example, too. One of the possible usages during the research is in the area of toollife of cutting inserts, which is realized at the Faculty of Production Technology and Management of Jan Evangelista Purkyně University in Ústí nad Labem. As part of this research various analyzes were also carried out. Part of such research was to analyze the resulting tool wear of the used inserts after turning of selected material also by electron microscopy, specifically the SEM analysis. The SEM analysis can show more and more what in the surveyed area might happen in comparison with conventional microscopy. Images are sharper and more stereoscopic and some aspects are more noticeable. That is why SEM was used as a complementary analysis method throughout this research. As an experimental material hardened steel class 16 343 according to the CSN 41 0002 has been used. The experimental material was turned on the three-axis CNC lathe DOOSAN Lynx 220L with the control system FANUC.Keywords: tool wear, electron microscopy, tool life. IntroductionAt the Faculty of Production Technology and Management, which is part of the Jan Evangelista Purkyně University in Ústí nad Labem several research projects are carried out. One of them is research in the area of tool life of cutting inserts, because using of cutting inserts is currently a common part of the manufacturing process and it is very interesting for production companies. As part of this research various analyzes were also carried out. One of these was analysis of tool life of experimental inserts by the SEM analysis, which is available at FPTM JEPU [1][2][3].The SEM analysis was used to supplement the final examination of the insert tool wear after machining.The abbreviation SEM means a scanning electron microscope. This microscope is working with a narrow electron beam. To formation of images primary and secondary electrons are used backscattered from the sample surface. These electrons are formed by the interaction of atoms of the sample with electrons of the electron beam. The detector receives and processes the electrons so as to obtain a sharp image of the sample surface. Rather than a traditional optical microscope its advantage is a large depth of focus and the ability to get more magnification [4][5][6].The SEM analysis can show more and more what in the surveyed area might happen, in comparison with convent...
Abstract. This article deals with a possibility of another extension longer lasting addition of coatings of titanium dioxide. The research based on the use of nanoparticles has development at present. Potential of added nanoparticles has large use. Particles of nanosize, i.e. below 100 nm exhibit other properties than larger particles and because of that this area is being explored in all possible sectors. This article deals specifically with the possibility of extending the lifetime of working surface molds made of aluminum alloy injection rubber mixtures used in automotive. Lifetime is longer lasting with PFTE coatings. Subsequently, it shows the effect of adding these particles at different mechanical properties in coatings on various surfaces (separated on a band saw, milling work, ground roughness 800 and 80 polished). In these cases roughness and hardness are evaluated. In the last part particles, their even distribution and size are identified. This is evaluated by electron microscopy.
The basic prerequisite for obtaining the coating of good quality is the production of a layer without the occurrence of surface defects. A possible solution to the occurrence of defects on the functional surface of the form is the application of a polytetrafluoroethylene (PTFE)-based coating. The coating helps to reduce surface roughness and “smooth” defects like pores and micro-shrinkage. For this reason, a new type and methodology of the coating were prepared to achieve more production cycles between the individual cleaning processes during the production of a tire. The subject of the study was the analysis of surface-applied micro-coatings, including the analysis of chemical composition by using energy-dispersive X-ray (EDX) and microstructure in the area of coatings. Detailed microstructural characterization of Alfipas 7818 and Alfiflon 39 and its imaging of surface structures were studied using atomic force microscopy. To examine the surface layer of the coatings, metallographic specimens of cross-sections (by means of a mold) were prepared and examined by light and electron microscopy. This new multilayer micro-coating with a thickness of 20–25 μm has been found to prevent form contamination during tire production and to extend production cycles by 200–400% between process cleanings. This finding was actually tested in the production of tires in the environment of a large manufacturing company.
Alloy modifying is common practice for improving the structure of the material. One of often used material, where the modification is used is AlSi7Mg0.3 alloy. And modification of AlSi7Mg0.3 is often realized by strontium. The paper deals with an experiment that was realized at the Faculty of Production Technology and Management of Jan Evangelista Purkyně University in Ústí nad Labem, which dealt with the effect of modifications by strontium on the structure of AlSi7Mg0.3. In frame of its experiment were analyzed metallographic samples and were observed structures of unmodified and modified material on the microscope. Was evaluated result of modification on the structure.
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