METHOD OF MAKING HOLLOW PRODUCTS WITH SHAPED OUTER AND INNER SURFACES Russian patent published in 1997 - IPC

FIELD: precision machine engineering, namely manufacture of blades and disks of turbomachines. SUBSTANCE: method comprises steps of performing calculation graphically or digitally on program carrier of computer in the form of thin tape with predetermined current values of its width depending upon position of radius-vector of helix; using thin strip as blank; profiling blank at cutting edges of thin strip by predetermined width along tangential line relative to means point of thickness of said thin strip. Direction of said tangential line coincides with direction of tangential line relative to means point of turn of product helix of respective radius-vector. Then thin strip is subjected to hardening and it is applied by coat in the form of films or powders. Product is assembled by means of coiling strip at controllable tension and pressure and at temperature being by 200-450 K lower than solidification point of its material. EFFECT: enlarged manufacturing possibilities at making complex-shaped products. 7 dwg, 4 tbl