2, scraping ash (plastic). After sheet metal correction, there are still some defects that sheet metal work can't make up for. Even if new parts are replaced, the center will be imperfect. In order to be more perfect, we need to use sculpture to make up for the defects.
3. automotive sheet metal painting: automotive sheet metal painting is usually divided into three steps;
A. Primer: it fills sand marks and micropores at the bottom of the workpiece, increases the adhesion of the lower coating, and has the function of defect indication. -
B. Intermediate primer: prepare a well-lubricated working surface for the top coat, complete the last procedure of all primer work, increase the adhesion of the participating layers and have a certain isolation effect to ensure the quality of the top coat.
C. topcoat: topcoat is divided into single-layer paint and multi-layer paint, which is a color fixing layer and a decorative maintenance layer.
4. Surface treatment of sheet metal painting and painting.
Extended data
Painting problem
Dry grinding and wet grinding
Problem: In the painting process, it is very important to treat the body surface that needs to be repaired. If it is not handled properly, it will not only make the surface feel rough, but also bring about repair, which will directly affect the satisfaction of the owner with the service. As an important process in sheet metal spraying maintenance, the traditional wet grinding process was used for surface treatment in the past, and the quality hidden danger brought by this process was increasingly exposed.
Measures: the surface treatment of sample workshop adopts full dry grinding process. The grinding mode of pneumatic tools or electric tools used in "dry grinding" can not only effectively absorb the dust generated during maintenance, but also improve the maintenance efficiency and ensure the effect.
Selection of covering materials
Problem: It is very common for people to cover the parts that don't need painting with newspapers, and it is also a common phenomenon in the industry. Strictly speaking, the lead ink in the newspaper may penetrate into the automobile paint surface during the high-temperature spray painting process, which will lead to bright "traces" on the automobile surface, affect the beauty of the automobile and even cause color infringement. This "consequence" is unacceptable to consumers.
Measures: In order to put an end to this irregular operation, the car body panels and painting workers must use antistatic shielding paper to shield the non-operating parts of the car body, so that when painting, it will not only leave traces on the car body surface, but also be very clean and hygienic, ensure the final painting quality and maintain the color consistency to the maximum extent.