How to spray blind holes on parts

       When spraying blind holes, special attention should be paid to heat dissipation and dust removal. Spraying small blind holes is the most difficult. The dust generated during spraying accumulates in the coating, which seriously affects the quality of the coating. Therefore, it is necessary to extend the auxiliary ventilation pipe into the blind hole to supply fresh air from the bottom of the hole, so that the sprayed surface can be properly ventilated. In addition, the substrate should be sufficiently preheated to pre-expand the substrate structure, so that the adhesion between the coating and the substrate will not generate too much stress after spraying.



In addition, according to the diameter of the hole and the depth of spraying in the hole, different spraying methods are used. If the diameter of the hole is large, more than 100mm, and the depth of the hole is not more than 50mm, the angle of the inclined spray gun can be used, and the parts are evenly rotated for spraying. If the hole diameter is less than 100mm, consider Spray with an inner hole spray gun.