This article deals with the subject of using iron and titanium carbide (Fe + TiC) based composite powder for treatment of cutting tools in a magnetic field with the purpose of improving internal thread cutting process. As a result of studies performed by us, it has been established that composite powder grain size influences the condition of the contact surfaces of cutting tool teeth and process efficiency. Also a relationship has been discovered between the changes in internal thread roughness and the condition of thread tap teeth contact surfaces pretreated in a magnetic field by Fe + TiC composite powder having various grain sizes.
Currently, welded heterogeneous structures are widely used in mechanical engineering. The mechanical processing of such complex products is accompanied by a self-oscillating process. For reducing the intensity of vibration, boring bar with an adjustable stress-strain state has to be used. Studies that were carried out by authors made possible to establish the influence of the microstructure of steels after heat treatment and in various stress states on the damping capacity. Εstablished influence allowed to select steel for the manufacture of a boring bar, in the inner cavity of which an expanding cone was installed for creating of a stress-strain state. Subsequent investigations as well made possible to establish the influence of the microstructure and the stress-strain state of the boring bar on the dynamic characteristics of the boring process of the welded structure. Such an approach enables preliminarily estimating the level of vibration amplitude while boring a heterogeneous welded structure, and to provide the specified parameters for the surface roughness of a precision product at the manufacturing stage.
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