| 摘要 |
PURPOSE: To provide a plasma spray torch with an elliptical nozzle hole obtaining a flat spray pattern for efficient spraying. CONSTITUTION: A nozzle hole 1a is formed out of an anode nozzle 1, a cathode 2 and an insulator 3. Also, the cathode 2 and the hole 2a are both formed elliptical and the anode-cathode distance is constant all around. Gas is supplied from a gas feed port 4 and magnetic field is applied from an electromagnetic oil 7. An arc is thereby generated between the electrodes to blow a plasma jet through the nozzle hole 1a. In this case, the sectional area of the plasma jet is elliptical and, therefore, a spray pattern for workpiece surface also becomes elliptical. Furthermore, the arc rotates, due to the existence of the magnetic field. Thus, the repetition of the conventional circular motion is eliminated, when a flame is sprayed over a wide range. According to this construction, a flame can be stably sprayed over a wide range, and flame spraying efficiency can be improved. |
