Spraying method and spraying device for mobile phone shell surface

Abstract

The invention discloses a spraying method and a spraying device for the mobile phone shell surface. A supersonic speed low-pressure cold spraying system is included and comprises a pressurizing preheating cavity and a powder feeder, the front end of the pressurizing preheating cavity is sleeved with a supersonic speed spraying gun, the front end in the pressurizing preheating cavity is divided into a feeding cavity and a preheating pressurizing cavity, and the output end of the feeding cavity and the output end of the preheating pressurizing cavity are jointly connected to a mixing cavity. Thesupersonic speed spraying gun comprises a sealed buffering chamber, the air outlet position of the sealed buffering chamber is provided with a laval nozzle for accelerating the mixed airflow to the supersonic speed, the outer surface of the sealed buffering chamber is in cup joint with a tubular water cooler for cooling, and a laser transmitter is further arranged above an air outlet of the lavalnozzle. Through combination of the supersonic speed cold spraying method and the laser deposition method, a mobile phone shell coating is more compact, the coating thickness is uniform and controllable, the ornamental value is improved, generation of harmful gases during the spraying work can be reduced to the maximum, and the resource cost is saved.

Description

technical field [0001] The invention relates to the field of mobile phone accessories, in particular to a method and a spraying device for spraying the surface of a mobile phone shell. Background technique [0002] The mobile phone case is a very common mobile phone protection device. Most of the mobile phone cases in the prior art are printed with various patterns on its surface, so that the appearance of the mobile phone case looks very beautiful. In order to obtain a more beautiful appearance and a more beautiful color There are abundant mobile phone cases, and the spraying process and spraying devices of mobile phone cases are becoming more and more diverse. [0003] Spraying mainly refers to the processing method of atomizing paint through a spray gun and coating it on the surface of an object. There are many kinds of compressed air painting, high pressure airless painting and electrostatic painting. Spraying operations use flammable paints containing a large amount o...

AI Technical Summary

Problems solved by technology

[0006] (1) The spraying device only adopts the ordinary spraying method, the spraying function is too simple, it is not suitable for special coatings and special spraying processes, and the thickness of the sprayed coating and the texture of the sprayed particles cannot be controlled;

[0007] (2) The texture of the mobile phone case obtained by the spraying device is relatively rough, especially for the manufacture of color-changing mobile phone case, it is not practical enough;

[0008] (3) Many harmful effects will be produced in traditional thermal spraying methods, such as high temperature oxidation, evaporation, dissolution, crystallization, residual stress, peeling, gas release, etc.

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