Aluminum Alloy Spraying Operation Precautions

- Jun 27, 2019-

Gun position

The spray gun should maintain a certain inclination, biased to the direction in which the profile is running. The spray guns are kept vertically parallel in the arrangement, the end portions are kept in a straight line, there should be no overlap between the spray guns, and the positions of the upper and lower spray guns are powdered. It is advisable to cover all profiles.

Fluidized air pressure control

The control of fluidized gas pressure, the role of the fluidized bed is to use the action of the gas flow to make the powder form a proper fluidization state, the hand feel is similar to the state of liquid flow, and the fluidization is detected to reach a sufficient state. * Simple operation is: When the hand or stick stirs the powder, there is no resistance. Fluidization facilitates the inhalation of the powder into the catheter. Under the action of accelerating wind, the effect of atomization is generated. If the pressure is insufficient or the pressure is too high, the fluidization may be insufficient.

Recycling of powder

The powder is recycled and reused. The powder adsorbed on the surface of the profile only accounts for about 1/3 of the powder output of all the spray guns. The powder scattered in the spray booth is more, and the recycled powder must be mixed with the newly added powder in an appropriate ratio. Better, so the powder should be recycled and reused in time.

Sealing in the spray booth

The sealing property in the spray booth, the powder is easily contaminated by the airborne suspended matter. After spraying, the surface of the profile is prone to flocculation or shrinkage. After baking, it affects the smoothness of the surface of the profile, so the spray booth should adopt sealing measures. To prevent the intrusion of pollutants.

The residual powder in the trachea should be cleaned and cleaned in time, not used for a long time, easy to agglomerate, powder is easy to produce powdering phenomenon, affecting the spraying effect

The spare powder bucket is used for powder replacement, which can effectively improve labor efficiency. The maintenance work of dustproof and moisture proof of the spare powder bucket must be done well to ensure the quality of the remaining powder in the powder drum.

Powder filling operation

The work of replenishing powder should also be taken seriously. Although the technical parameters have been debugged before production is normal, the profile should be continuously monitored through the powder filling window, and it is found that the powder is shallow and the powder is not adsorbed. powder. Since the amount of powder sprayed by the manual rubbing gun is larger than that of the automatic gun, the manual rubbing gun can be speeded up by hand. In addition, due to the influence of its own structure, some profiles produce some dead angles during the dusting process. Even if the powder is added, the normal effect cannot be achieved. These positions should be distinguished. Do not blindly replenish the powder. Otherwise, the powder is too much. Thicker, affecting the surface quality of the profile, and wasting powder. This position is mostly located on the profile with a deep groove and a narrow width. Most of these grooves are located on the non-decorative surface of the profile. The overall appearance of the profile is not very significant because the two opposite faces are in the groove. The same pole and the distance are too close, forming a mutually exclusive electric field, that is, the Faraday shielding effect, which hinders the adsorption of the powder inside the groove.

Oven (cure oven) operation

The problem that should be paid attention to during the production process of the oven. During the powder coating production process, due to the limitation of the production line, the running time of the profile in the oven completes the whole baking process, although the oven is relatively comparative in the operating procedure. Simple, but the process parameters control requirements are more stringent, such as conveyor belt running speed, furnace temperature control, operating speed can be controlled by adjusting the frequency of the variable frequency motor, the key point involved in furnace temperature control is the adjustment of the supply pressure, for The gas pressure requirement is stable at about 1kg/cm2. To achieve this requirement, pipe gas is generally used, and the pressure of the gas supply is continuously adjusted by the press machine to ensure the normal operation of the combustion device.