| 摘要 |
PURPOSE:To stably restrain the bending at the time of cooling a rail under a simple method by executing the cooling of the bottom face of rail under the specific condition at the way of cooling the head top face and head side face of rail heated at austenitic range temp. or higher. CONSTITUTION:The high temp. rail 1 holding heat of austenitic range temp. or higher by heating is charged in the cooling apparatus in the right standing state toward longitudinal and the heat top face temp. is measured by a thermometer 8 to output to a control device 9. Next, the head top face and heat side face of the rail 1 are adjusted, so as to be positioned at a prescribed distance H from nozzles 11, 12 and the cooling is executed by injecting air to the head top part and the head side part of rail 1 from the nozzles 11, 12 by an upper nozzle header. In passing the prescribed time, when pearlite transformation becomes 40-60% by progression of cooling of rail head part, the control device 9 is worked to the adjusting valve 7, to execute the cooling by injecting 1/2-1/5 quantity of the air to the rail head part and, to the bottom part of rail from a lower part nozzle header 3. In this way, the temp. difference between the head part and the bottom part of rail 7 is minimized and cooling with non-deformation is executed.
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