METHOD OF SHOT-PREENING OF SEAMLESS RAILWAY WHEELS Russian patent published in 2000 - IPC

FIELD: mechanical engineering and metallurgy. SUBSTANCE: method may be used for surface strengthening of articles and preparation of surface for application of coating. Method includes surface strengthening of disc and places of its turning into rim and hub by shot. The operation is performed by ejection of shot from six Laval's nozzles at pressure of 4.6-5.5 kgf/sq. cm for 10-8 min on both sides of wheel. Laval's nozzles are positioned in diametrically opposite directions for overlapping of surface working zones by three pairs of nozzles by at least radius value of every zone of working. Use of the proposed method provides for enhancing of endurance limit of disc by 30-40%. EFFECT: higher efficiency. 2 dwg, 1 ex