The manufacture of parts of the vehicle by liquid forging out of alloy АК7

This article describes a new technology for the production of parts in the application to the parts of aircraft equipment, manufactured from aluminum alloys, combining the preparation of the melt to the casting, and a method of manufacturing the actual details. The study was conducted on a known casting aluminum-silicon alloy AK7ч widely used in the aerospace industry, for the manufacture of power units parts operating in difficult-loaded conditions. Preparation of the melt to the casting, in addition to the conventional techniques, was introducing into the molten metal before pouring nanopowder of boron carbide В4С, the particles of which have dimensions of the nano-range and high hardness melting temperature, and therefore perform the role of an effective crystallization centers - so-called modifiers. The result of their introduction into the melt is a refinement of the structure of the alloy of the products obtained, which leads to the improvement of their mechanical properties. The method of obtaining details of the modified boron carbide alloy is used for this purpose, the technology of liquid forging, the essence of which consists in pouring the melt into the matrix, followed by pressing. The main positive feature of this method is the suppression of education in the crystallized alloy gas-shrinkage cavities, which also contributes to increase the mechanical properties of the molded parts. The work has been done on a real part of the aircraft equipment type “adapter” power unit. In the result of a combination of inoculation of melt nanopowder of boron carbide and its subsequent pressing were the items received with higher mechanical properties compared to standard technology - temporal resistance increased to 8.37 per cent, and plasticity - in 2.1 times.