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CJSC Zventa makes preparation and processing of aluminumHeat treatment. Opening A. Vilma in 1911 of the fact that at some alloys mechanical properties as a result of the special heat treatment known as aging improve was the most important in technology of alloys of aluminum. For the first time it was established for alloys with copper and magnesium, and then and for all alloys. Aging is carried out to two stages; on the first an alloy is heated to temperature slightly below temperature of melting of aluminum, at the same time by such components as copper, form solid solution. At fast training components of an alloy remain in solid solution.
Molding and processing by pressure. Casting to the earth (more precisely, in argillo-arenaceous forms) is used for production of massive details like the block of cylinders of engines, and molding in standard forms including molding under pressure is applied to mass production of fine details. The forms for castings made of ceramics, steel or cast iron are widely used (molding in a constant form, or kokilny molding). A usual molding alloy may contain up to 8% of Cu or to 13% of Si. The most widespread aluminum molding alloys contain additives of Mg, Ni, Fe, Mn or Zn. Low temperature of melting of aluminum and its good molding properties promote broad application of aluminum molding.
See also METALS MOULDING. Besides, use aluminum preparations which gain excellent qualities after heat treatment and processing by pressure. It was earlier widely applied duralumin - the aluminum alloy from 4% of copper which is previously subjected thermal and machining. Now duralumin is a wide set of the high-strength aluminum alloys containing except copper also manganese, magnesium, silicon, etc. These alloys have tensile strength to 414 MPas (42,2 kg/mm2), close to durability of low-carbonaceous steel. More modern alloy containing zinc at the room temperature has tensile strength to 690 MPas (70,3 kg/mm2). These alloys are used in production of details of planes and can replace some old cupriferous alloys.
Alloys of hot and cold processing. Aluminum and its alloys can be subjected to cold and hot processing. At hot processing there is a destruction of structure of an ingot and its transformation into uniform fine-grained structure to the improved properties. Hot molding and stamping allow to make thin preparations which cannot be received at cold processing. In such a way receive a bar, a wire, a rod iron, a leaf and other special profile. Cold processing is made at a final stage for obtaining generally the sheet, a bar, a wire and pipes. At cold processing durability and hardness of a product increases. Generally, hot processing is used for preprocessing of an ingot, and cold has advantage at the last stage of processing.
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