Rapid cooling plasma cutting method

The plasma cutting method comprises the following steps that a cutting table is arranged, specifically, a refrigeration water tank communicates with a drainage pipe and a water pumping pipe, the water outlet end of the drainage pipe is arranged at the top of the cutting table, the water pumping pipe communicates with the bottom of the cutting table, and the refrigeration water tank discharges low-temperature cooling water to the cutting table through the drainage pipe; circulating cooling water is adopted, it can be guaranteed that the temperature of cold water in the cutting table can be rapidly balanced, after cutting, the cooling water makes contact with the position of a workpiece after cutting, and rapid cooling work after the workpiece is cut is achieved through the temperature of the cooling water; the gas expansion phenomenon is limited or the expanded gas is cut off in a high-pressure water spraying mode, the situation that the gas induces the high-temperature range to be expanded is avoided, and it