METHOD OF MANUFACTURING RUNNER FOR FLANCIS TURBINE HYDRAULIC MACHINE

摘要

The invention relates to metallurgy, and more specifically to the manufacture of impellers for radial-axial hydraulic machines. The purpose of the invention is to increase the operational reliability of the impeller. The method includes welding blades, heat treatment of the wheel, heating the lower rim and the middle part of the blades to 250-350 ° C at a speed of 100-300 ° C / h, air cooling and final machining of the wheel. The application of the method allows to increase the resistance to the formation of fatigue cracks and the operational reliability of the impeller. 1 il.