A new method for determining surface roughness based on improving the kinematics of the milling cutter movement during micro-cutting has the advantage of the precise spatial position of the micro cutter edge. A change in the components of the speed of movement and rotation during a complex movement of the cutter changes the mechanism of plunging of the cutting edge into the workpiece material. Based on the model developed in this work, the kinematic parameters of the cutter were determined, and new relationships between the cutter geometry and parameters of the technological process were discovered. The revealed new relationships made it possible to determine not only the mechanism of chip formation but also the dimensions of damages to the workpiece surface during plunger cutting.
This paper discusses a new complex approach and an example of its practical application to solve the problem of improving the precision ceramics products and parts operational performance (ensuring high operational stability). The proposed approach consists of forming micro-texture in a ceramic product surface layer through vacuum-plasma deposition of conductive nanocomposite coatings based on a multicomponent thermally stable nitrides Ti-Al-Cr system as an auxiliary electrode in electrical discharge machining such as forming a specific microtexture in the surface layer, e.g., a combination of cavities, grooves, etc. This approach considerably improves the ceramic product surface layer characteristics, reduces contact surfaces' "ceramic product – counter face" adhesion and friction intensity, and ensures increased wear resistance and ceramic product operability.
The research aims to investigate the effect of depositing nitride and Si-containing amorphous hydrogenated carbon films on the characteristics of SiAlON-based ceramics experimentally. The effect of TiN/(Ti,Al)N, (Cr,Al,Si)N and (Cr,Al,Si)N/a-C:H:Si coatings on the microrelief and surface defects of ceramics was studied. The nanohardness, plasticity, and coefficient of friction of the ceramic material at room temperature and under heating conditions after applying the mentioned coatings were quantified. Laboratory durability tests of ceramic mills with different coatings during machining a heat-resistant nickel alloy were carried out. A qualitative assessment of the nickel adherence intensity on the work surfaces of ceramic tools during cutting was performed.
The rapid development of new technologies employing laser, electron beam, electroerosion and other processes as the working ones requires new approaches to developing systems controlling operations being performed. However, these processes do not lend themselves to visual observation and do not allow the introduction of any sensors into the working process zone, which suggests that vibroacoustic diagnostics methods should be used. The article discusses obtaining information from a vacuum chamber under electron-beam action on thin films of reinforcing coatings. It is shown that the parameters of vibroacoustic signals accompanying the formation of new structures can be recorded with the help of flexible waveguides in the form of a wire drawn from a vacuum chamber to a plate with an accelerometer. The article presents and discusses monitoring the formation of intermetallic compounds under the influence of a pulsed electron beam on an aluminum plate covered with a thin film of a heat-resistant nickel alloy.
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