METHOD OF PRODUCING COPPER LINING OF CUMULATIVE CHARGE Russian patent published in 2016 - IPC F42B1/36 B21K21/02 B21D51/10 

FIELD: technological processes.

SUBSTANCE: invention relates to metal forming and can be used in making lining of cumulative charges for 100 mm-calibre with variable wall thickness. Method of producing copper lining of cumulative charge includes at first stage of cylindrical copper workpiece forming a preliminary disc workpiece, wherein cylindrical is used, which is annealed at 400-420 °C for 40-60 minutes. Preliminary disc workpiece is subjected to recrystallisation annealing in saltpeter bath at temperature of 450-470 °C for 35-45 minutes with subsequent cooling in water to ambient temperature 15-35 °C. Second stage includes final immersion of disc workpiece with a metal microstructure in deformed state. After mechanical treatment a shaped workpiece is obtained, with inner surface of variable thickness decreasing towards centre of workpiece, profile and geometrical sizes of shaped workpiece are determined by graphical analytical method with allowance of 1.04-1.05 from dimensions obtained by graphical analytical method. Rolling shaped workpiece at conical mandrel is performed with intense cooling with lubricant-coolant fed at a rate of not less than 25 l/min, to production of hollow cone with wall thickness decreasing to top of hollow cone and cone angle 40°-70°. Recrystallization annealing is carried out in saltpeter bath at temperature of 450-470 °C for 20-25 minutes with subsequent cooling in water to ambient temperature. Tempering is performed at a temperature of 240-250 °C for 14-16 minutes.

EFFECT: invention increases armour penetrating ability by obtaining a funnel with homogeneous microstructure along generatrix.

1 cl, 2 dwg