The report aims to investigate the influence of chemical reactions on comb crack formation and propagation in coated cemented carbide milling inserts with different compositions. A series of novel experimental techniques have been developed and applied to understand oxidation and corrosion effects on comb cracks. Furthermore microstructure changes in the region of the comb cracks on worn milling inserts were studied by high resolution microscopy. It has been observed that the main effect of the oxidation and corrosion on comb cracks is connected to an attack of the binder phase, affecting its composition, distribution and morphology. Different comb crack types for dry and wet milling have been observed. In the presence of cooling media (wet machining) inserts present lateral cracks (fatigue induced) connected to the principal comb crack, which form at regions where the binder has been strongly corroded. Despite the addition of Cr and (Ta,Nb)C enhance both the oxidation and corrosion attack resistance have a minor effect on the formation and propagation of comb cracks. Schematic models based on the experimental results and scientific discussions are presented to understand the influence of oxidation and corrosion in the formation and propagation of comb cracks.

This thesis deals with manufacturing process of a front wheel hub carrier prototype for formula TU Brno Racing Dragon 5 series. The paper starts on foregoing work of design team leading to a proposed model and material. Both material and model are investigated form a manufacturing point of view. Cutting conditions and milling strategy are proposed based on final product analysis. Prototype was manufactured on CNC machining centre MCV 754 QUICK in company BOSCH DIESEL s.r.o. in Jihlava. Retrospective analysis of performed manufacturing process and critical risks is provided with a proposal of more effective manufacturing process. In the closure, there is technical-economical evaluation of chosen manufacture done by milling. Alternative manufacturing options including 3D print and welding are compared in technics and costs.

This thesis descibes questions of tools for production of shape hollows focused especially on milling and electroerosion machining. Here you can find individual tools included their description and characteristics, toolmakers and their news. Here are mentioned methods and contemporary trend of cutting. Here is comparison of several tools in concrete applications. Included is also list of basic types of milling tools clamping. In conclustion there is mentioned further development of tools and their using.