As the construction machinery market becomes more active, competition among manufacturers extends beyond performance to aesthetics, making the quality of coating on parts particularly important.
De-oiling → Masking → Shot Blasting → Cleaning → Primer Spraying → Drying → Finish Coating → Leveling → Drying → Cooling → Touch-up → Assembly.
Use a towel soaked in de-oiling agent to wipe the surface. The towel should be folded three times to maximize usage; do not ball it up. Wipe in one direction only to avoid secondary contamination. Remove splatters and particles from edges and corners with a scraper. The surface should feel non-greasy after de-oiling.
Remove all loose oxide scale, rust, and coatings. Use rubber plugs, bolts, and special masking tools to cover threaded holes, shaft holes, fit surfaces, and nameplates. Avoid using materials like paper tape that can be knocked off during shot blasting.
3.1 Material Selection: Use alloy steel shot with a diameter of 0.8mm-1.0mm, without adding wire. Ensure the surface roughness is 15-25μm after blasting to avoid excessive coarseness that affects gloss.
3.2 Quality Requirements: At least 9 out of 12 blast heads should exceed 20A, achieving Sa 2.5 cleanliness. The surface should show only slight spot or streak marks and have a metallic sheen.
3.3Pellet and Dust Removal:Use the compressed air pipe and the shot suction machine to clean the steel shot on the structural parts and the inner cavity, blow the floating dust, and finally use the dry ice blasting machine to spray it comprehensively to ensure that the surface cleanliness reaches level 2, see the figure below:
4.1 Paint Adjustment: Check the reliability of the lifting link and clean the viscometer with a solvent before and after measuring. Stir the sample evenly.
4.2 Spraying Technique: Hold the spray gun perpendicular to the surface, 20-30cm away, at a speed of 30-60cm/s with 1/2 to 1/3 overlap. Required coating thickness is 90-130μm. Maintain proper hand, eye, and body posture during spraying.
Dry the primer at 70-80°C for 40-60 minutes and the finish coat at 70-75°C for 50-60 minutes. Confirm actual drying using either the cotton ball method or finger touch method to check for surface residues. Necessary tools include steel shot and sandblasting equipment.
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