The paper shows that it is possible to increase the efficiency of a vertical screw mixer of bulk materials and reduce costs by determining the required size of the feeding hole in the lower part of the casing, as well as by installing a screw flange with a reverse winding in relation to the screw spiral inside the screw casing and by installing a replaceable tip with a variable lead angle at the lower end of the screw. The analysis of the process of screw loading in the hopper allowed us to obtain an analytical dependence to determine the required size of the feeding hole, in which mixed materials freely enter the screw spiral. It is proved that the placement of the screw flange on the inner surface of the casing increases the driving force of material by 1.05 – 1.80 times depending on the screw speed, which significantly reduces specific energy consumption for preparation of mixture of the desired quality. The paper provides the formula for calculating the angle of installation of the flange with respect to the screw spiral, in which the maximum effect of the flange on the mixed materials is obtained. In order to ensure the effective capture of mixed materials in the loading zone of the screw, it is proposed to perform the first spiral turn from the lower end of the screw with a variable lead angle and place it on a replaceable tip. A technical solution to the placement of spirals on the double-threaded screw is also proposed.

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The article considers a mathematical model of the surface roughness of electrotechnical details from copper processed by combined tool with a longitudinal arrangement of tools for turning and diamond smoothing with a study of the patterns of microrelief formation during machining and plastic deformation of a copper surface. Experimentally have been proved the relevance and scientific significance of the work and the need to take into account one of the component roughnesses in the calculations of other combined tools

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The article is devoted to one of the promising areas of combined processing methods and, in particular, vibration mechanochemical treatment (VIMHO) and vibration mechanochemical coatings (VIMHP). A classification has been developed depending on the energy capacity of the system (the nature and intensity of the processes occurring between the base and the coating).