| 摘要 |
the invention relates to the methods of renewal of the openings of basic parts made from cast iron, and can be used, for example, for repairing the cases of internal combustion engines. A method of renewal of internal cylindrical surfaces of cast iron articles includes preliminary annealing of article at a temperature 600 - 650 DEGREE C with holding in electric furnace for a period of 1.5 hours. After annealing the article is heated to the temperature of 450 - 550 DEGREE C. Then, the heating of article is conducted to the temperature of 820 - 840 DEGREE C with its cooling in the sprayer at a speed of 150 DEGREE C/s at displacement of article relative to the source of heating and cooling with a rate of 2-4 mm/s. After this, the final annealing of article is carried out in the electric furnace at a temperature of 180 - 200 DEGREE C during 2 hours. Technical result - increase of the wear resistance of renewed articles.
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