The effect of high-temperature thermomechanical treatment (HTTT) on abrasive wear resistance of steel 30KHGGSA as the main material to manufacture holder of mining machine cutters is studied. The procedure of HTTT during deformation of cylindrical steel fragments at the preset settling-down rate and subsequent quenching is described. The finite element modeling in DEFORM-3 finds distribution of plastic strain in volume of forged pieces. On the plant based on the upright drilling machine, the abrasive wear resistance of forged pieces is tested on sandstone and siltstone as the medium-hardness and abrasivity co-rocks most frequently met in development heading. It is shown that pre-deformation of the fragments before quenching, i.e. HTTT, imporves the steel hardness from 44 to 55 HRC. It is shown that as against specimens nondeformed before quenching, the abrasive wear resistance of steel subjected to plastic straining up to εΣ ≈ 0.7 increases by 1.9 times in case of both siltstone and sandstone. Considering the obtained results, it is suggested to amend the manufacturing technology of cutters by quenching of fholder forging starting immediately from the forging temperature and by subjecting thereby the holder to high-temperature thermomechanical treatment. The cutting tool cartridge is to be held in the holder by cold pressing. It is assumed that HTTT application can essesntially (two times and more) improve wear resistance of steel holder head and, as a consequence, extend service life of cutters.

This article describes an approach of mathematical processing of signals (seismograms) from five blasthole charges from experimental blasting, each 3 m deep, with equal explosive weight (1 kg), and equidistant (3 m) from one other. The seismic explosive waves were measured at a 13 to 25 m distance. This article provides spectral analysis, wavelet analysis, and fractal analysis results. It defines the dependence of dominant frequency and amplitude on the distance to the blast center. According to the experimental data, the dominant frequency is calculated as y = 1.0262x0.2622 and the amplitude dependency as y = 18.139x−2.276. Furthermore, the analysis shows that 80% of the entire signal is concentrated in half the area of frequency range, i.e., the low frequency zone is of the most interest. This research defines the dependence of distance on the energy value of signal wavelet analysis. It is demonstrated that, according to the experimental data, the 12th frequency range is closely correlated with the distance values. This article gives the definitions of entropy, correlation dimension, and predictability time. This experiment shows that entropy and correlation dimension decrease but predictability time increases when the distance to the blast center increases. This article also describes the method for determining optimal drilling and blasting parameters, and concludes with the possibility of applying the analytical results to predicting and enhancing drilling and blast-ing operations.

Present article is dedicated to the analysis of problems of the oil industry of Russia and is aimed at the development of a mechanism for its growth. The research is based on the results of the economic analysis that has been carried out on the basis of statistical data from the government and major oil companies as well as on the basis of analytical reports of independent companies. Among the main identified problems of the oil refining industry it can be mentioned following problems: insufficient volumes of raw material processing, lack of refinery capacities, remote location of oil extraction and refinery plants from the end users and unbalanced tax system in the industry. Specified problems are being solved on the level of companies and the state that brings results, however, there is no clear development mechanism of the oil refining industry so far. The authors suggest a development scheme for the Russian oil refining industry implying cooperation of businesses and the state. The implementation of the proposed scheme will ensure the investments for the extension of production and obtaining a product with a higher added value as well as increasing the competitiveness of the Russian oil products.