Thick coating layer cooling device for inner hole thermal spraying

Abstract

The invention discloses a thick coating layer cooling device for inner hole thermal spraying. The device comprises a nitrogen conveying pipe, a control valve, an input signal wire, a nitrogen storagetank, a controller, an infrared sensor wire, a nitrogen spraying device, an infrared sensor and an inner hole rotating spraying gun; the inner hole rotating spraying gun extends into inner holes of workpieces; the nitrogen spraying device is arranged on the inner hole rotating spraying gun and pointed to the surfaces of the inner holes of the workpieces; the nitrogen conveying pipe is arranged between the nitrogen storage tank and the nitrogen spraying device; the control valve is arranged on the nitrogen conveying pipe; the input signal wire is connected between the control valve and the controller; the infrared sensor is arranged on the inner hole rotating spraying gun and pointed to the surfaces of the inner holes of the workpieces; and the infrared sensor wire is connected between theinfrared sensor and the controller. Through the mode, the thick coating layer cooling device for inner hole thermal spraying effectively reduces the problems of oxidation and falling of coating layers, and improves the spraying quality and efficiency.

Description

technical field [0001] The invention relates to the technical field of thermal spraying, in particular to a thick coating cooling device for inner hole thermal spraying. Background technique [0002] In the process of internal hole repair or additive manufacturing using thermal spraying technologies such as plasma or arc, the material is sensitive to temperature changes, especially in the thermal deposition process, improper temperature control often leads to overheating of coating materials and workpieces, and substrate materials Thermal deformation and aging, as well as the thermal expansion coefficient mismatch between the coating and the substrate, cause damage stress. When the coating and workpiece are overheated and damaged due to thermal stress, the coating is easy to fall off during processing and use. [0003] At present, in order to control the temperature, some of the thermal spraying technologies use compressed air and liquid carbon dioxide to cool the coating, b...

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Problems solved by technology

[0003] At present, in order to control the temperature, some of the thermal spraying technologies use compressed air and liquid carbon dioxide to cool the coating, but this method cannot quickly remove the heat generated by the thermal spraying of the inner hole, especially When spraying a thick coating with a thickness greater than 0.5mm, poor spray cooling causes a cooling gap in the coating gap, resulting in a reduction in production efficiency

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