What is sheet metal spray painting

1. Sheet metal correction is the preliminary shaping work for paint spraying. We compare the car body to the human body. A perfect human body is like It is the figure of a model, which is a metaphor for a piece of luxurious fashion. If you put it on a person with missing limbs, it will not reflect anything and look eclipsed. But if you put it on a model, it will be dazzling. Show nobility. It's a very simple truth. How can a distorted car body bring out the brilliance of the paint? Many painters think that sheet metal is not their job, but I don’t think so.

2. Dust scraping After the car body has been corrected by sheet metal, there are still some defects that cannot be compensated for by sheet metal work. Even if new parts are replaced, there will be imperfections. In order to achieve To be more perfect and precise, you must use sculpture craftsmanship to make up for defects. After a car is deformed or damaged due to other reasons, its flatness, wheel angles and lines need to be filled with scraping ash and ground and molded out. The formula shows that scraping = restoring body skin = mold product = mold processing procedure. Any body skin of a car is stamped by a mold. Repairing the body skin is the same as repairing the mold, so we use scraping and shaping technology To connect it with mold processing, this is a job that ordinary painters cannot do. Many painters who have been working for many years will sigh: "It is easy to paint a car well, but it is difficult to paint a piece of dust. It takes ten years to paint." A ball of ashes.” The person who said this probably really knows what car spraying is.

3. Spray painting We usually divide it into three steps

<1> The first primer fills the sand marks and micropores on the bottom layer of the workpiece, increases the adhesion of the lower paint, and also has Defect indication function.

<2> The primer is a very important part of the coating. It prepares a complete and smooth working surface for the topcoat, completes the last step of all primer work, increases the adhesion of the intervening layer and has the ability to A certain isolation effect to ensure the quality stability of the topcoat.

<3> Topcoat Topcoat is divided into single-layer paint and multi-layer paint, which is the color defining layer and decorative protective layer. Single-layer paint is commonly called plain paint, also known as ordinary paint. One layer completed. Multi-layer paint is divided into silver powder series paint and pearl series paint. It is a paint completed in double-layer and multi-layer construction processes. Silver powder paint is made from special aluminum materials and has high protection, outdoor stability and strong The pearl series paint is made of mica flakes, shells and other materials through high technology. It is a high-end paint with rich colors and strong decorative properties.

The spraying quality of the topcoat part is very demanding. It must be clean, plump, bright, not droopy, not hanging, uniform in gloss, no leakage, no squandering, good leveling, no bottom bite, It is not easy to be impetuous and color-biased. It is really not easy to do all these aspects in one go. It requires extremely rich experience and troubleshooting capabilities.

4. Paint treatment, as the name suggests, is the last step of the topcoat. After the paint has dried, the flaws on it will be dealt with. Even if you try your best, there will be some imperfections left. Then only It was remedied later. In fact, no matter how satisfactory the paint surface is, it is not perfect. For example, the car paint of Mercedes-Benz and BMW will have a slight fish scale phenomenon, which is commonly known as the orange peel phenomenon. This is the flow of the paint film. Of course, the natural phenomenon caused by the drying time lag during the flattening process is difficult for ordinary people to detect. It requires expert appreciation to detect it. Therefore, the only way to deceive the eyes of experts is to perform paint treatment, which we call "mirror surface". deal with". First use 1500-2000 mesh cosmetic sandpaper for leveling and grinding (2500 mesh can be used if necessary), then grind with coarse wax composed of pumice or clay to remove the sandpaper traces, and next use fine-cut wax for grinding ( Silicone-free>, remove traces of coarse wax, then use a reducing agent to achieve perfect gloss, then use a mirror treatment agent to completely remove the halo and smear marks. At this time, the paint has reached its deepest luster. The last step is to seal the glaze. This results in an expert-level, flawless paint finish.

Sheet metal is not that simple

Many people think that automobile sheet metal spray paint repair is a simple manual process. In fact, the entire repair process requires well-trained personnel and professional equipment. Do. Once the damaged vehicle has been inspected and properly repaired it’s time for sheet metal and painting.

In terms of technology, carbon dioxide gas shielded welding is now basically used, which avoids the disadvantages of the previous oxygen-acetylene heating area and damage to the internal structure of the metal. However, in terms of process, everyone must beware of "stealing" by individual shops. "Man-hours", the sheet metal process was not done properly, and putty was used to fill in the dents when the sheet metal was not flat. Thick putty will cause the paint surface to crack when exposed to heat, especially the front machine cover that is close to the engine and air conditioner. The hidden danger is even greater.

Painting is a delicate job

The entire painting process includes more than a dozen processes, and without any one of them, it is impossible to ensure that the car paint will remain as new for a long time. There are several aspects that are prone to problems. First, clean the surface. Many roadside shops fail to do this well. They just wipe it with a few hastily and leave all the trouble in the future to the customers. Second, in the step of spraying primer, regular repair shops will follow the procedures step by step, but small shops will save as much as possible. Customers will not notice any difference when picking up the car, and it will only appear later in use. Problems such as paint peeling and fading.

The third is to spray color paint. According to Master Wang, color paint and bright oil must be sprayed three times each to ensure that the effect after spraying is as bright as new. If corners are cut, many hidden dangers will be left.