| 摘要 |
PURPOSE:To reduce variance of hardness and to miniaturize an air source equipment by cooling rail top part in order with atomized water, hot water injecting flow and air and specifying the temp. of the rail surface at the time of changing over to each cooling step. CONSTITUTION:The rail 1 is reciprocatively shifted in the atomized water cooling zone (between I and II) and is cooled with the atomized water from nozzles 2 for water cooling arranged above the top part and near both sides of the rail 1 till the temp. of the rail surface becomes >=530 deg.C. Next, this rail 1 is reciprocatively shifted in the hot water injecting flow cooling zone (between II and III) and is cooled with the hot water injecting flow from nozzles 4 arranged above the top part and near both sides of the rail 1 till the temp. of the rail surface becomes >=420 deg.C. Further, this rail 1 is reciprocatively shifted in the air cooling zone (between IV and V) and is cooled with air from nozzles 3 arranged above the top part and near both sides of the rail 1 till the temp. of the rail surface becomes about 200 deg.C. By this method, structure in the rail top part is made to fine pearlitic structure.
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