METHOD OF MANUFACTURE OF ELASTIC METALL SEALING GASKETS Russian patent published in 2018 - IPC B21D53/20 

FIELD: machine engineering.

SUBSTANCE: invention can be used in the manufacture of an elastic metal gasket with a cross-section Ω-shaped form for detachable connections of units of power plants. The annular preform is prepared by welding a butt-end of an austenitic dispersion hardening alloy 36NXTU with quenching at a temperature of 970±10°C for 20 minutes and cooling in water at a temperature of 10-25°C. Then, the profile of the gasket in the stamp with expansion punches is formed in two operations. At the first operation a preliminary moulding is produced. The second operation is a calibration. Then the obtained liner is subjected to a dispersion hardening at a temperature of 660±10°C for 4 hours in the device with its volumetric fixation and cooling in the air. Then the preform is predeformated in the axial direction with deformation in the elastoplastic zone for 12-18 hours. Sealing edge is subjected to mechanical processing with getting the height of pads, exceeding the size of lock of split connection on the amount of axial elastic deformation of the gasket.

EFFECT: increase the elasticity of the obtained gasket and the accuracy of its landing diameter.

1 dwg,1 ex