1. Adjustment of Spray Gun
(1) Spray air pressure
The spraying air pressure is: 4.0 bar for traditional Spray Gun (1bar=10 5 Pa), 2.5 bar for RP Spray Gun, and 2.0 bar for H VLP Spray Gun.
(2) Spray distance
Spraying distance: traditional Spray Gun 18~23cm, RP Spray Gun 15~23cm, H VLP Spray Gun 13~17cm.
(3) Adjust the spraying air pressure
Maximum atomization: The spraying air pressure adjustment knob is in a position parallel to the gun body, and the spraying air pressure adjustment knob is rotated clockwise to decrease the spraying air pressure.
Minimum atomization: The spraying air pressure adjustment knob is in the vertical position with the gun body, and the spraying air pressure adjustment knob is rotated counterclockwise to increase the spraying air pressure.
(4) Adjust paint flow
Increase paint flow: Turn the paint flow adjustment knob counterclockwise to increase the needle stroke, thereby increasing paint flow.
Decrease paint flow: Turn the paint flow adjustment knob clockwise to decrease needle travel, thereby reducing paint flow.
(5) Adjust the spray width (fan surface)
Increase the spray rate: turn the spray rate adjustment knob counterclockwise.
Decrease the spray pattern: Turn the spray pattern adjustment knob clockwise.
It is recommended to adjust the spraying air pressure, paint flow rate, and spray width to the maximum under normal conditions, then adjust the required spraying air pressure through the gun tail meter, and maintain a stable spraying air pressure state for continuous spraying operations.
2. Spray gun control steps
control step (1)
The spraying distance is shown in Figure 1.
control step (2)
Orbital spraying: The Spray Gun keeps a certain vertical distance from the object to be sprayed, and reciprocates at a constant speed, as shown in Figure 2.
control step (3)
Angle: Always maintain a vertical 90° angle with the object to be sprayed, as shown in Figure 3.
control step (4)
Angle: Always maintain a horizontal 90° angle with the object to be sprayed, as shown in Figure 4.
Control steps (5)
Overlap of spray width: general Spray Gun requires spray width overlap of 50~60%, while environmental protection Spray Gun (HV LP) requires 70~80%, as shown in Figure 5.
Control steps (6)
Gun speed: The Spray Gun moves at a steady and constant speed, and the Spray Gun speed is 30~50cm/s. If it is too fast, the paint will be too dry, the surface will be rough and orange peel will easily occur; if it is too slow, it will easily cause sagging and falling. For example, when spraying silver powder metallic paint, it is more likely to produce adverse effects such as silver accumulation and clouding.
Note: The gun speed and distance need to be proportional and average.
control step (7)
Paint wrench control: The trigger is divided into two gears (① gear: pre-spray air, can also be used as dust blowing ② gear: the paint flowing through the nozzle is atomized by the pre-spray air at the same time).
Edge finishing skills when painting: Edge finishing operations must be performed when doing small repairs or when doing edge spout spraying. The meaning of closing the edge is not to pull the trigger at the beginning of the gun movement, that is to say, the amount of paint supplied is very small at this time. As the Spray Gun moves, the amount of paint supply is gradually increased, and the trigger is not released until the gun movement is about to end. Open, the amount of paint supply is greatly reduced, and then a natural transition effect can be obtained. There are two specific operation methods, one is to spray from the outside to the inside, move the Spray Gun steadily, and when it is close to the surface to be sprayed, gradually pull the trigger to spray, and then release the trigger suddenly and steadily, but still keep the arc of the Spray Gun Move; the other is to spray from the inside out, place the Spray Gun above the surface to be sprayed, pull the trigger to spray,
Then move the gun smoothly outward, once the gun is close to the port area, slowly release the trigger and continue to move the gun in an arc.
