Keywords: Circulation, stirring, medium, coolingcapacity, circulationstirring, workpiece, movement, steamfilm, boilingcoolingstage, workpiececooling,

　　the influence of circulation and stirring on the cooling capacity of the medium

　　The circulating stirring of the medium and the movement of the workpiece can destroy the steam film and promote the boiling cooling stage to come ahead of time, thus improving the cooling capacity of the medium and the uniformity of the cooling of the workpiece. The greater the relative movement speed, the stronger this effect. However, if the speed is too large, eddy currents will be formed at the cross-section of the workpiece, resulting in uneven local cooling. Practice has proved that the medium circulation and stirring at an appropriate speed have a good effect on avoiding the formation of soft spots, reducing distortion and avoiding cracking.

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