| 摘要 |
PURPOSE:To improve the reliability and efficiency of a cutting operation by making a cutting section lie in a clean and dry atmosphere by a method wherein a bag-shaped heat resistant skirt is provided around the top end of a cutting torch and a gas is supplied into the skirt to thereby form a partition wall for shielding water from outside. CONSTITUTION:Compressed air is supplied into the bag-shaped space provided by the heat resistant plastic skirt 2 through the gas supply nozzle 3 so that the skirt expands to form a partition wall 5 and at the same time, the compressed air is supplied continuously inside the partition wall 5 to thereby increase the pressure inside the wall 5. As a result, a dry atmosphere is produced within the partition wall and a copper plate 4 is cut by a plasma arc cutting torch 1. In this case, a secondary waste material 6 generating during cutting is removed by being thrusted toward the rear surface of the copper plate 4 from a cutting slit 7. Therefore, it is possible to cut the copper plate 4 accurately and easily while the cutting operation is watched by an underwater lighting device provided inside the partition wall 5, to keep clean the cutting section of the copper plate before cutting, to perform a preparatory cutting operation easily and to improve the reliability of the cutting operation to thereby increase the working efficiency. |
