1, Sheet Metal Painting: Sheet Metal Painting is a kind of automobile repair technology, which repairs the deformed part of the automobile metal shell. For example, if the car body shell is knocked out of a pit, it can be restored to its original state by sheet metal, and then the deformed car metal surface can be restored to the same brightness as other intact places by spraying special paint.
2. Sheet metal correction: it is the preliminary plastic work of painting in automotive sheet metal. We compare it to a woman's body, and a perfect woman's body is like a model's body. For example, if an ordinary person wears a luxurious fashion, there is nothing to show, and it will be eclipsed. Then, if you let a fashion model wear it, it will look dazzling and noble. Very simple, how can a twisted car body set off the brilliance of paint? Many painters think that sheet metal is not their job.
3. Scraping: After the automobile body sheet metal is corrected, there are still some defects that cannot be compensated by sheet metal work. Even if new parts are replaced, there will be imperfections. In order to be more perfect and accurate, it is necessary to use sculpture technology to make up for the defects. After the car is deformed and damaged for other reasons, its flatness, wheel angle and lines need to be scraped and polished. Explain with this formula: scraping ash = restoring body skin = mold product = mold processing program. The body skin of any car is stamped by a mold, and we repair the body skin just like repairing the mold. Therefore, our scraping molding process should be consistent with mold processing, which is impossible for ordinary painters. Many painters who have worked for many years will sigh, "It is easy to spray a car well, but it is difficult to grind a handful of ash for ten years."
4. automotive sheet metal painting is usually divided into three steps:
1. First coat of primer
Filling the sand marks and micropores at the bottom of the workpiece increases the adhesion of the lower coating and also has the function of defect indication.
2. Intermediate primer
In the very important painting part, a complete and smooth working surface is prepared for the topcoat, and the last procedure of all primer work is completed, which increases the adhesion of the intermediate layer and has a certain isolation effect, ensuring the quality stability of the topcoat.
3. Top coat
Top coat is divided into single-layer paint and multi-layer paint, which is a color fixing layer and a decorative protective layer. Single-layer paint is commonly known as plain paint, also known as ordinary paint, and can be completed in one layer. Multi-layer paints are divided into silver powder series paints and pearlescent series paints, which are completed in two-layer and multi-layer construction procedures. Silver powder paint adopts special aluminum material, which has high protection, strong outdoor stability and strong observability. Pearl series paint is made of mica and shells through high technology, which is a kind of high-grade paint with rich colors and strong decoration.
5. Surface treatment of sheet metal and painting: as the name implies, it is the last process of finish painting. After the paint surface is dried and solidified, the defects on it are treated. If we do our best, we will leave some imperfections, and then we can only remedy them later. In fact, the satisfactory paint surface is not perfect. For example, the loading paint of Mercedes-Benz and BMW will have a slight fine fish scale phenomenon, which is also commonly known as orange peel phenomenon. This is a natural phenomenon caused by the drying time difference of paint film during leveling. Of course, it is difficult for ordinary people to detect it, and it needs expert appreciation to find it. Therefore, if we want to fool the eyes of experts, we have to carry out paint treatment, which we call "mirror treatment" First, use 1500-2000 mesh beauty sandpaper for leveling and polishing, and then use coarse wax composed of pumice or clay to polish to remove the traces of sandpaper. Next, polish with fine wax to remove traces of coarse wax, then use reducing agent to achieve perfect luster, and then use mirror treatment agent to completely remove ring lines and scratches. At this time, it can be achieved with paint.