A comparative study of the tribological properties of antifriction silumin casting АК15М3 and typical bronzes БрОЦС, БрОФ and БрАЖ at the friction in the lubricant-20A in a wide range of sliding velocities and pressures of the tests. The conclusion is made that the silumin АК15М3 can be used to replace anti-friction bronze type БрОЦС, БрОФ and БрАЖ in highly loaded friction units.

It is shown that melting and molding of aluminum bronze are difficult physical and chemical processes. In them the major role is played by the centers of crystallization of dendrites of a a-phase, the a-phase nanocrystals dissolved and the adsorbed oxygen and hydrogen. The role of the modifying crystals of an intermetallid of ZrAl3 is reduced to reduction of concentration of the dissolved oxygen and hydrogen and an intensifi ation of process of coagulation of nanocrystals of a a-phase in the centers of crystallization of dendrites of a a-phase.

The production technology of casting details for rotary engine from the aluminum alloy АК12М2 is developed. The bulk density of expanded polystyrene to ensure the best quality of the surface of castings has been experimentally established. The lost foam casting shop was organized in the experimental department of the Institute.

The peculiarities of technological processes of obtaining steel castings of shut-off valves by lost foam casting are described. It is shown that the dimensional accuracy of the casting «Valve Body DN80» exceeds 7-th accuracy class; the surface quality, mechanical properties and chemical composition of the steel completely meet the customer requirements. The test procedure for leakproofness of shut-off valves castings is given.

The article deals with the issues of complex technology and equipment for refining and casting steel and alloys in the foundry industry. Solutions are given that make it possible to guarantee a reduction in nonmetallic inclusions in the melt, as well as to solve a number of other related problems of foundry production, such as the introduction of a bottom blowing melt system with an inert gas; the introduction of protection of the metal stream from secondary oxidation; lining the arch of an electric arc furnace, etc. Various types of products and equipment produced by NPP Vulkan-TM are shown: blowing bottom plugs and assemblies, metering nozzles, gas-dynamic protection of the metal stream from secondary oxidation, two-arm wire-feeding machine mod. TAP 2–1 with unwinding device.

Advantages of the equipment for steel casting and extra-furnace steel processing are described.

The dependences of the influence of the chemical composition of cast iron in the Fe-Cr-Mn-Ni system on the chromium cotent in the metal base (Cr¹⁰⁵⁰_о) and carbides (Cr¹⁰⁵⁰_Cr) after normalization from 1050 °C with aging for 4.5 hours were established. During the heat treatment of the castings, a redistribution of the elements between the phases of the cast iron occurred. The maximum chromium concentration in the base after normalization was 19.7% at 1.09% C, 3.1% Mn, 25.5% Cr and 0.19% Ni, and the minimum 2.4% at 3.91% C, 0.6% Mn, 11.43% Cr and 0.19% Ni. The maximum amount of chromium in carbides 78.4% was observed in cast iron containing 1.09% C, 5.4% Mn, 3.01% Ni and 25.57% Cr, and the minimum 43.5% at 3.59% C, 5.4% Mn, 3.01% N and11.43% Cr. The obtained dependencies allow predicting the chromium content in the metallic base and can be used during the elaboration of new compositions for wear-resistant cast iron, as well as at choice of heat treatment regimes.

The results of research to determine the influence of the amount of carbon in chromium cast irons on the formation of castings in sand and combined molds are described in the article. Experimental studies were carried out with casting samples from wearresistant cromium cast iron with different carbon contents. The microstructure of the obtained samples is presented, and its analysis is performed. Numerical studies have been carried out to evaluate the effect of the carbon content on the dynamics and kinetics of hardening of castings in sand and combined molds. The influence of the carbon content on the hardening process of cromium cast iron castings during foundry casting in sand and combined molds is established. The results of the research were used for the manufacture parts of crushing and grinding equipment.

The basic directions of improvement of properties of silicate binders and mixtures on their basis are generalized. Organic and inorganic additives for liquid-glass mixtures and autoclave modification are considered. A huge number of various additives proposed to improve the knockout rate of liquid-glass mixtures is due to the complexity of the processes occurring in the mixtures at high-temperature exposure. In order to obtain the optimal structure, it is necessary to ensure the presence in the silicate solution of colloidal particles of liquid glass and active functional groups of a polymeric modifier capable of interacting with this surface.

Stages of system analysis and mathematical models for predicting the dendritic structure of multicomponent aluminum alloys are considered. Computer diagnostics of nonequilibrium crystallization is realized by the joint use of the apparatus of computational thermodynamics and means of computational heat transfer for solving problems of computational materials science. The results of modeling the evolution of the dendritic structure are presented with a change in the diffusion intensity in the solid phase from equilibrium conditions to complete suppression.

By omitting materials subject to the labeling requirement in part 1 cold-box resin, Düker GmbH from Laufach can achieve an impressive reduction in emissions.

Emission and workplace exposure limit values represent major challenges for foundries, and are becoming increasingly important due to every stricter statutory regulations. In particular, compliance with emission guidelines is essential in safeguarding company sites, and is now of equal significance as technical and economic issues. Modern foundries such as Düker GmbH from Laufachpursue a sustainable corporate policy in which the three pillars of cost-effectiveness, social responsibility and environmental protection are accorded equal importance. Düker’s example shows how the use of the new ECOCURE BLUE technology supports environmental protection and occupational health and safety, while also facilitating efficient, highly productive core production.

The article presents the results of research on the development of the lubricant composition for the production of sand-resin rods over a heated tooling with high technological and consumer properties. It has been established that the conditional viscosity of the developed lubricant compositions decreases when oleic acid is added to the polymethylsiloxane liquid in an amount of 5 to 25% from 10 to 8 s, and the density of lubricants is reduced from 908 to 882 kg/m³. It has been established that when oleic acid is added to the base in an amount of 15%, the sedimentation stability of the lubricant is increased by more than 30 times. It is shown that the developed lubricant composition has the best lubrication characteristics at the following component ratio: base (polymethylsiloxane liquid PMS 300) – 15%, additive (oleic acid) – 15%, surfactant – 3,0%, water – the rest. The results of the research can be used by the process engineers when choosing the composition of the lubricant for making rods by the heated tooling.

One way to compact large-sized sandy-clay mixtures is air-pulse molding. Spreaders used in practice in pulsed molding do not ensure homogeneity of the density at the surface and in the volume of the mold. The design of a gas flow divider is proposed that allows changing the area of the apertures due to the shaped plate and, accordingly, increasing or decreasing the speed and volume of the transmitted air fl w acting on the mixture. This ultimately guarantees uniformity of density throughout the volume of the mold.

Also results of researches of voltages and the density appearing in a coma of a mix on height at sealing of sandy-clay forms by an air stream are resulted. The use of air molding with a dissector and a plate for making large-sized molds made it possible to obtain a batch of castings with high geometric accuracy and surface roughness.

The article presents the results of research of the influence of technological modes of injection molding of aluminum alloys, such as the pressing speed, molding time in a mold, the method of depositing a separation coating on the mold surface and the composition of the lubricant on the erosion resistance of the separation coatings. It is established that the pressing speed is most significant from the factors that influence the thickness of the lubricating layer forming on the working surface of the mold. When using water-based coatings, the thickness of the separation coating layer on the mold surface is reduced from 19,0 to 3,2 mm; for fatty separation coatings with a powder filler from 40,0 to 7,0 mm. It was also found that the minimum thickness of the lubricating layer of the separation coating is observed in the gate area and is in the range from 1,2 to 1,7 mm for the investigated water-emulsion separation coatings and 6,0 to 11,0 mm for fatty greases. It is shown that when the separation coatings are applied by a mechanized method, the thickness of the lubricating layer is 2,0–2,2 times lower than when applying lubricant manually.

The anodic behavior of a lead-antimony alloy (3 wt% Sb) doped with alkaline-earth metals was investigated in potentiostatic method in the potentiodynamic mode at a potential sweep rate of 2 mV/s and it was shown that with an increase in the content of alkaline earth metals in the alloy (SSUZ), the potentials of free Corrosion and pitting are slightly shifted to the positive region. As the concentration of the chloride ion in the electrolyte increases, these potentials decrease. The current density of corrosion and, accordingly, the corrosion rate of alloys with an increase in the content of alkaline earth metals are reduced by 75–85%, and the concentration of chloride ion increases.

In transition from alloys with calcium to alloys with strontium, the corrosion rate of alloys increases by 20–30%, and to alloys with barium it decreases by 25–30%.

The calculation procedure of temperature field of a mold and specific heat flow on its working surface during cyclic thermal exposure is set forth. The results of calculation are given.

This article reveals the main energy efficient solutions and innovations implemented in the framework of the investment project «Organization of production of rolled bar iron with the construction of small-section wire rolling mill» in the open joint stock company «Belarusian metallurgical works (BSW) – Management Company of Holding «Belarusian Metallurgical Company (BMC)». This project was included in the list of the most important projects for the creation of new enterprises and industries that are crucial for the innovative development of the Republic of Belarus. Supplier of technology and equipment for the project were made by the company Danieli & C. Officcine Meccaniche SpA (Italy). The modern and unique equipment used in this investment project allows to use more than 90% of fuel and energy resources (by using the heat recuperator of flue gases, heat recovery boiler, recuperative burners, etc.). Implementation of the project allowed to carry out the maximum processing of production and to receive new production with higher added value.

The work offers a comprehensive analysis of the dispersed metallurgical Fe-C containing wastes. The possibility with the help of high-temperature processing of the wastes to obtain a material with unique electrical and magnetic properties was shown. The results of laboratory studies allowed to develop the general scheme of complex processing of disperse metallurgical Fe-C containing wastes and to create on this basis the experimental-industrial installation.

The paper presents the results of research on the use of recycled aluminum waste (RAW) during extra-furnace steel processing in ladle refining furnace. It has been established that simultaneously with the deoxidation of refining slags before desulfurization of steel, their liquid mobility increases, which eliminates the need for using fluorspar for these purposes.

A thermodynamic analysis of possible reactions of formation of aluminates and calcium aluminosilicates in the refining slag has been carried out. It has been suggested that the cause of thinning of refining slags from the addition of RAW is the formation of a number of low-melting eutectics containing aluminates and calcium aluminosilicates. The composition of briquettes based on RAW for liquefaction of refining slags is proposed. Dependence of the friability and breaking load of briquettes on the content of CaO, the temperature and drying time is established. The data on the composition and properties of the refining slag after treatment with a diluent based on RAW are given.

The successful promotion of the product nowadays the manufacturer must meet all the strict requirements of the consumer in the quality of the products. At OJSC «BSW – Management Company of Holding «BMC» the centerless turning unit was put into operation, which allowed the company to manufacture a new type of product with a higher added value. This is a mechanically processed rod with a diameter of 19–79 mm and with a tolerance of a diameter of IT9. As a result of the work done, the optimum cutting regime for the centerless turning unit was determined using a rod of diameter 80 of 42CrMo4 alloy steel.

The article discusses the use of a device for stress relieving in the manufacture of cold-shaped reinforcement armature with a diameter of 10 mm, which makes it possible to increase its plastic characteristics. Ductility or deformability is a complex characteristic of the reinforcement, which directly affects the safety of buildings and structures.

From modern understanding point of view of the operation of reinforcement in reinforced concrete two characteristics are used for the ductility characteristics: the ratio of the time resistance to rupture to the yield point and the total relative elongation at maximum load ratio of tensile strength to yield strength

Traditional technologies allow to produce stable cold-formed reinforcement armature only of the ductility class «A». Application of special types of profile and «non-traditional» relief devices potentially will allow the production of cold-worked reinforcement armature of class of ductility «B».

The article describes the history of the formation and development of metal cord production in Belarus. The main ways of the Belarusian metallurgical works had followed from the production of the first tons of steel wire cord, before reaching the production capacity, twofold of the design capacity. The authors paid a lot of attention to the structure of hardware production, which is the visiting card of the plant today, to people who directly participated and promote the process of new products manufacture. Particular attention in the article is devoted to the geography of deliveries of metal cord and the main customers – consumers who use this product in the production of tires. The changes in the properties of the steel wire cord from the moment of first manufacture to the present time is traced, based on permanent changes of the requirements of the automotive industry.

Based on mathematical and physicochemical modeling a studied the effect of alloying elements (chromium, molybdenum, vanadium) in the formation of the mechanical properties of steel. The intervals of the content of alloying elements that ensure the fulfillment of the required norms are determined. Dependences of the change in the mechanical properties of doped rolled steel from the index of the structural state d are constructed.

Casted composite materials have found application in various branches of industrial production. However, there are still a number of problems related to the choice of optimal technology for their synthesis and the solution of which will help to achieve in practice high level of properties predicted by the theory and provide the control of interfacial interactions to enhance the stability of the structure and properties of composites. There is s need in additional research related to the development of new types of reinforcing elements, which will provide the raise in the level of performance of the composite. It is established that an important role plays not only the type of the matrix but also the chemical composition and microstructure of the reinforcing material. This would require research on optimization of technology for production of composite materials during the solid-liquid synthesis. The paper presents generalized results of experimental studies of peculiarities during the formation of composite materials on the basis of bronze and iron granules with the use of high-speed induction melting. As reinforcing phase iron granules DCHL with a diameter of about 1 mm were used.

It is established that the process of symmetrical rolling is accompanied by high metal pressure on the rolls, which leads to wear on their working surface. To reduce the metal pressure, the tension of the strip ends is applied. With a minimum forward tension, the deformation conditions are realized in the case of a discrepancy between the circumferential speeds of the working rolls. It is determined that the precision of products depends on the amount of advance and this must be taken into account when rolling with variable reduction. An equation for determining the instantaneous advance of the metal in the cross section of the exit from the deformation center during the rolling of profiles of variable cross section with increasing compression is presented. It has been theoretically proved that in order to reduce tool wear and to achieve the specified dimensional accuracy of the rolling profile, it is quite sufficient to roll the strip in the last pass with a minimum unit reduction of not more than 0,5 mm.

The technology of plastic forming of wide flanges in tube billets with the predicted length of the transitional toroidal section between the outer plane of the flange and the internal cavity of the pipe is proposed. The procedure for calculating the length of this section is given. In order to eliminate the toroidal portion in the flange formed during the flanging of the pipe, it is proposed to perform its plastic shaping by depositing the cylindrical part of the workpiece. Equations for calculating the extent of the free surface on the toroidal part of the workpiece when it is shaped, depending on the coefficient of contact friction and the presence of a radial support of the flange are obtained. The variant of forming in the flange the toroidal section in the stamp with the compensation cavity is proposed. Equations for calculating the deformation force and the extent of the free surface are given.

A brief review of the main types of additive technologies providing direct manufacturing of metal parts was carried out. Peculiarities of direct manufacturing of metal parts using LOM-technology (laminated object manufacturing) are compared with other additive technologies. Different methods of juncture stacked sheet metals during fabrication of LOM-parts, including methods of mechanical, adhesive, welded and soldered juncture were analyzed. The advantages and disadvantages of each of these methods were considered. The possibilities of juncture sheet stacked metals by welding and soldering were demonstrated experimentally.

The positive effect of using a new coating composition is primarily achieved due to the increase of the applied coating layer thickness to 20 mm on the hardened working surfaces of the tooling and due to introduction of gypsum in its composition. These actions improve the machinability of the coating application and the core formation on the surface of the heated coating of the crust, prevent emission of the gas phase from the reaction zone during heating in the furnace at 520 °C for 4 to 8 hours, as well as the use of strontium fluoride and an increase in the ferrocyanic potassium content. The diffusion capacity of the saturation process increases due to these actions. The use of a new composition, the change in the thickness of the layer, and also the fixation of the temperature regime of heating will ensure an increase in the operation life of the hardened tool parts by 1.5–2 times.