METHOD OF MANUFACTURING METAL SEALING ELEMENTS Russian patent published in 2001 - IPC

FIELD: power engineering industry. SUBSTANCE: invention relates to technology of manufacture of metal sealing elements from bronze BrB₂ used for sealing of detachable connections in power plant units. Bars of bronze BrB₂ are set on preheated forging tools in steps. In every step (pass) deformation degree does not exceed 50%. After forgings are broached with formation of central hole workpieces are rolled out on preheated mandrel step by step with degree of deformation in each step not exceeding 50%. Workpieces are rolled out on rolling-out machine till required diameter of ring is obtained and then cooled down in water. Cooled-down workpieces are annealed at temperature of 400 ± 10 C, hardened at 790 ± 10 C, and aged at 400 ± 10 C. EFFECT: prevention of ignition of sealing material and increased effective production output due to enhancing of bronze structure uniformity. 4 cl