| 摘要 |
PURPOSE:To exactly calculate and control the thickness of a thermally sprayed film during thermal spraying by determining the thickness of the sprayed film by using an ultrasonic rangefinder during spraying of spraying particle groups with a plasma spraying gun which move back and forth to the spraying surface of a material to be thermally sprayed. CONSTITUTION:The surface 1a to be thermally sprayed of the material 1 to be thermally sprayed and parallel rails 8 are fixed and in this state the distance from the ultrasonic rangefinder 5 up to the surface 1a is measured. The distance in this stage is the thickness 'do' when the thickness of the film 2 to be thermally sprayed is O. The plasma spraying gun 4 is then operation to generate the spraying particle groups 3 and at the same time, the gun is moved back and forth on the rails 8. The distance between the rangefinder 5 and the surface 1a is determined at every n-time of the forward and backward movement of the spraying gun 4. the thickness of the film 2 at the n-th time of the forward and backward movement of the spraying gun 4 is expressed by Ta=dn-do. The thermal spraying operation is ended in order to complete the constitution of the initially set film to be thermally sprayed. As a result the thickness of the film 2 measured with a micrometer coincides with the result of the measurement by the rangefinder 5. |
