METHOD OF PUNCHING OF FORGED CENTRE PLATE PIECE FOR RAILWAY CARRIAGE COUPLING AND DEVICE FOR METHOD IMPLEMENTATION Russian patent published in 2010 - IPC B21K7/00 B21J13/00 

FIELD: metallurgy.

SUBSTANCE: inventions refer to manufacturing of machine component blanks, such as punching, out of worked-out large cylindrical parts, such as wheel set axles of railway vehicles. Method involves stepped blank upsetting, final punching and burr cutting. Shaped upper punch with work cavity with stepped conical surface is used for upsetting. Device includes shaped upper punch with work cavity and flat lower punch. Conical surface features four steps with respective cone angles of α₁ = 30°, α₂ = 3°, α₃ = 55°, α₄ = 5°. Each step surfaces are smoothly conjugated. Ratio of each step height to diametre comprises h₁ : d₁ = 0.3, h₂: d₂ = 0.4, h₃ : d₃ = 0.07, h₄ : d₄ = 0.4.

EFFECT: improved quality of forged centre plate piece.

2 cl, 8 dwg