METHOD TO MAKE CYLINDRICAL PARTS FROM ANISOTROPIC MATERIALS Russian patent published in 2011 - IPC B21D22/16 B21D51/10 

FIELD: technological processes.

SUBSTANCE: invention is related to the field of metal plastic working. The method includes laying a stock in a clamping groove of a rotary device and rotary drawing on a mandrel. A round stock is cut from a sheet. The stock is deformed with extent of deformation ε=0.05-0.12. A convex part is formed in a stock by preliminary drawing to form a cylindrical cavity. Diameter of the cylindrical cavity is equal to the diameter of the working surface of the mandrel. Then the stock is annealed at recrystallisation temperature T=(0.5-0.6)T_PL. Rotary drawing is carried out in two stages. At the first stage a convex part of the stock is deformed with wall thinning. At the second stage the flat part of the stock is deformed to produce a hollow stock with simultaneous thinning of its wall. The diameter after the preliminary drawing is calculated using the following dependence: D'₀=D₀/e^ε, where D₀ and D'₀ - diameters of initial stock and after its preliminary recrystallisation, ε - extent of stock deformation prior to recrystallisation annealing, e -base of natural logarithm.

EFFECT: higher quality of a part.

1 dwg, 3 ex