Vol 37, No 3 (2017)

The operational principle of electrofurnaces used to roast vermiculite, sungulite–vermiculite conglomerates, and other minerals is blocking their further development. An alternative design is proposed, with vibrational batch supply. Higher-energy furnaces may be created on that basis.

By means of the proposed thermal model and corresponding software, the thermal characteristics of high-precision spindles may be quickly assessed in the initial stages of design.

The influence of surface microprojections—their shape and additional harmonics—on the elastic contact of a flat surface and a surface with regular microrelief is considered on the basis of the elastic contact of a half-plane and an undulatory surface. It is shown that the contact-pressure curve depends on the surface gradient of the microprojection and the mutual influence of adjacent microprojections.

The factors that affect the wear and durability of artillery systems are considered. The dependence of the barrel wear on the number of shots fired is determined experimentally. The use of wear-free technology in barrel manufacture reduces the wear by an order of magnitude and thus extends barrel life.

Individual aspects of information security when using automated control systems in production are considered. The network-interaction protocols and the characteristics of possible phishing attacks on the control-system components are described. The use of firewalls and systems for intrusion detection is proposed.

A method is proposed for assessing the influence of the positional error of the axial drive module on the machining precision in a lathe.

The article continues description of geometric errors laser correction for multi-axis NC-systems–CMMs and machine-tools. The Kalman’s concept of observability and controllability is applied to the method. In order to observe the multi-axis system a versatile laser measuring system is used, and in order to control the system a program postprocessor is proposed, introduced between CAD/CAM and NC-systems.

On the basis of the Preston hypothesis, it is possible to establish variation of the clamping force in the course of machining such that the contact pressure is stabilized and the productivity is increased. In the finishing of planes with different initial microrelief, the time dependence of the contact area is found to be exponential. The assumptions made in the analysis are experimentally verified in abrasive finishing on a Rastr 220 machine. With exponential variation in the force — that is, variation analogous to that of the contact area in abrasive finishing—the productivity is increased by a factor of 2.5–3.

The precision attained in the shape and mutual position of cylindrical surfaces after machining may be assessed by means of a mathematical model. The effectiveness of the model is confirmed in practice.

Hydrocarbon pollution of wastewater is unavoidable in industry and transportation. Pollution monitoring, which forms part of environmental protection, may be based on measuring the optical density of water samples. In the present work, a device for this purpose based on a diamond UV photodetector and a nonmonochromatic UV source is described.