METAL STRENGTHENING METHOD Russian patent published in 2004 - IPC

FIELD: plastic working of metals, possibly in aircraft- and ship-making machine engineering.

SUBSTANCE: method comprises steps of tensioning shaft blanks before twisting them until accumulated deformation "e"; according to preset yield limit for shearing τ_0.3 (at allowance for plastic shearing 0.3%) determining accumulated deformation by deciding equation where ς(e) = Aeⁿ - material yielding curve, β(e) = β₀ + (1 -β₀)exp(c e) - parameter characterizing Bauschinguer effect; A, n, β₀, c -material characteristics.

EFFECT: possibility for enhancing constructional strength of shafts of metals non subjected to heat treatment, improved reliability of machines and mechanisms with such shafts.

1 dwg