The workflow of automotive sheet metal, how to do automotive sheet metal

Automobile sheet metal (metal plate) is a kind of automobile repair technology, which refers to the repair of the car body after the collision, that is, all the work except for the anti-corrosion and decoration of the car body. Such as the analysis of automobile body damage, the measurement of automobile body, the shaping of automobile body sheet metal, tensile correction, stress relief welding, and the assembly and adjustment of automobile body accessories.

To put it simply, if the vehicle has an accident or a failure of sheet metal parts, it is necessary to repair and paint the sheet metal, and restore the appearance and structure of the vehicle to the requirements of the factory.

To put it bluntly, if the appearance of the body is damaged and deformed, the process of sheet metal is required.

Car painting is a kind of car beauty method, which refers to giving a layer of paint on the surface of the car to protect the car.

Automobile primer, also known as anti-rust primer, is the paint for the primer, which is generally directly applied to the surface of the object or applied to the surface of putty. Its function is to prevent oxidation and corrosion of the metal surface, and enhance the adhesion of the metal surface to putty or intermediate coat and topcoat.

So the simple summary is that if your body has cosmetic damage and deformation, you need automotive sheet metal. If you simply want to enhance the wear and corrosion resistance of the car, you can choose painting.

The main process of sheet metal work: The main process of sheet metal work can be roughly divided into:

1: Body disassembly.

2: Body correction.

3: Body restoration.

Each of these processes can be subdivided into several processes. There are two concepts that must be covered in the in-depth explanation.

1: Automobile trade.

2: Car body.

1: The automobile repair industry can be basically divided into mechanical repairers, electrical repairers, sheet metal repairers, painting repairers, and other accessories, beauty, and special repair industries are not included.

The division of the car body means to remove the whole car circuit computer system, remove the whole car engine drive, brake steering system, and remove the car paint. Then all that remains is the body of the car.

2: The body assembly (this is a generic accessory name) includes: body sheet metal parts (metal parts) car glass, the whole car lamps, the whole car, exterior decoration parts and handles, seats and accessories, lock mechanism, window sealing and lifting mechanism, door and front and rear sail cover connection mechanism, the sum.

In other words, when your car has problems such as broken glass, door lock failure, damaged trim, etc., remember that you need to find the car sheet metal and not other types of work!

Since the car is a high-precision whole. And electrical accessories and mechanical accessories should be attached to the corresponding position of the car body with high precision and low error. Even the straightness and curviness of the paint (which greatly affects the appearance of the body) are highly dependent on the error value of the body sheet metal, so the sheet metal body and repair have become a pure manual work that has no hard standards, no automatic tools, and cannot be intuitively taught in the automotive industry.

In short, car sheet metal is the complete repair of a faulty and damaged car body!

A detailed explanation of the sheet metal worker's workflow (e.g., a car that crashes and causes a rollover accident).

1: Dismantling of the whole car (removing all the sheet metal parts that may be involved or the parts where the painting work is carried out).

2: Car body repair (replacement, stretching, welding and other repairs caused by the impact or overturning of the iron plate dentation, beam bending, dimensional displacement and other injuries).

3: Sheet metal repair (all damaged sheet metal parts should be repaired for bonding, welding and other appearance and size restoration).

4: Strict repair of sheet metal parts (resetting the repaired sheet metal parts such as doors and lamps and non-sheet metal parts such as displaced machinery and electrical appliances, which requires superb skills and unremitting patience to achieve accurate installation and beauty).

5: Whole car installation (installation and fixing of all sheet metal parts after painting, as well as testing of all movable sheet metal parts).

6: End of factory.

What is the automotive sheet metal workflow? Understand the process well, and it is not easy to be pitted when repairing the car!

Sheet metal is a type of work for auto repair, mainly for the appearance of the body, the replacement of the external car body (such as bumpers, doors), repair, orthopedics, and paint also belong to the sheet metal work area, there is a specific division of labor in the sheet metal, the sheet metal in the broad sense is fully covered, and the sheet metal in the narrow sense is only to replace the outer car body, as well as the use of welding, orthopedics and other general repair of the car shape work, the sheet metal in the broad sense and putty, grinding, and painting, as well as polishing, are their respective divisions of labor in the interior, what we call sheet metal, Generally in a broad sense!

Sheet metal is a comprehensive cold working process for metal sheets (usually below 6mm), including shearing, punching, lamination, folding, riveting, splicing, forming (such as automobile body) and so on. Its distinctive feature is that the thickness of the same part is the same.

Generally speaking, the basic equipment of sheet metal process includes shear machine, CNC punching machine, laser, plasma, water jet cutting machine, bending machine and various auxiliary equipment such as: uncoiler, leveling machine, deburring machine, spot welding machine, etc.

Generally, the four most important steps of the sheet metal process are shearing, punching, rolling, welding, surface treatment, etc.

1. Automobile sheet metal is a job in automobile repair.

2. Mainly responsible for the body repair work after the collision of the car.

3. The general workflow is 1: body disassembly and assembly 2: body correction 3: body repair.

With the increase in the number of cars in China year by year, there is a shortage of more than one million skilled automotive talents. Car sales, car beauty, car marketing, car maintenance, car tuning, ......Each link needs a large number of automotive skilled talents, and the market opportunities are great, and it is time for young people to learn automobiles.

Auto repair sheet metal includes disassembly and adjustment methods of automobile body parts, sheet metal repair process, adjustment of body deformation, welding operation technology, plastic repair technology, etc.

Automobile sheet metal data restoration is a technical means of automobile repair, mainly to repair the body after the collision, and it is called automobile sheet metal data restoration except for the repeated spraying of the body and decoration.

Automobile sheet metal data recovery includes the analysis of automobile body damage, the measurement of automobile body, the shaping of automobile body sheet metal, tensile correction and so on. Therefore, automobile sheet metal is actually a processing technology for automobile maintenance, also known as cold work, simply put, if the body shape is damaged or deformed, it needs to be processed by the process of sheet metal. The repair of a collision vehicle is not a simple beating of the car's sheet metal, and the quality of the repair is not just about the appearance or gaps of the vehicle by the naked eye.

It is necessary to restore the three-dimensional data of the key points of the body to the state when it leaves the factory.

Generally speaking, the basic equipment of sheet metal process includes shear machine, CNC punching machine, laser, plasma, water jet cutting machine, bending machine and various auxiliary equipment such as: uncoiler, leveling machine, deburring machine, spot welding machine, etc.

Generally, the four most important steps of the sheet metal process are shearing, punching, rolling, welding, surface treatment, etc.

Disassembly and adjustment methods of automobile body parts, sheet metal repair process, adjustment of body deformation, welding operation technology, plastic repair technology, etc.

Learn more and practice more, as long as you work hard Sheet metal is easy to learn, that is, practice more.

1) Damage confirmation. After the damaged area is cleaned, the extent of the damage is confirmed, and a repair method is established. (2) Sheet metal disassembly.

The sheet metal parts of the damaged parts of the collision vehicle are removed from the original body by cutting or other means. (3) Remove the old paint film. The original paint on the damaged part is sanded until the iron plate layer is exposed.

4) Sheet metal parts are leveled. According to the degree of damage to the sheet metal parts, the corresponding sheet metal tools are used to flatten the depression parts. After the leveling operation, the surface of the sheet metal parts should be finely adjusted for flatness.

In the process of repairing a collision vehicle, the operation process of sheet metal and painting is very complex, and the maintenance skills and experience requirements of maintenance personnel are also very high. In order to allow car owners to understand the operation process of sheet metal and painting, we will take the operation specifications formulated by sheet metal and painting operators in the sheet metal painting competition as an example to briefly introduce the operation process of sheet metal and painting.

If the collision of the car body is serious and the frame is injured, it is necessary to correct the whole vehicle structure on the frame straightening machine, and the operation will be more difficult.

Painting operation process:

1) Damage confirmation. After cleaning the damaged area, the extent and extent of the damage are confirmed, and a repair method can be established.

2) Polishing the feathered edges. A buffered slope is sanded at the connection between the damaged part and the surrounding paint film, so that the newly sprayed paint surface can be better connected with the original paint surface.

3) Apply an epoxy primer. Clean and degreased the damaged surface again, apply epoxy primer and dry it for anti-rust treatment.

4) Scrape putty. After the damaged parts of the sheet metal coated with epoxy primer are slightly sanded and cleaned and degreased, they are scraped and coated with putty, which is often referred to as putty. After the putty is dried, it is sanded, and the stamping line is confirmed.

5) Spray primer. After sanding, the putty is cleaned and degreased, the primer is sprayed, and the baking is dried. When spraying primer, pay attention to the parts that do not need to be sprayed in reverse.

6) Primer in sanding. The primer is sanded to the same height as the original paint surface to confirm the flatness.

7) Paint mixing. Although the original paint is generally available in the authorized service stores, the color of the topcoat is different from the original paint after the vehicle has been used for a long time, so it is necessary for the painter to manually adjust the paint.

8) Spray the topcoat. Add the adjusted topcoat to the spray gun can, adjust the air pressure, paint output and spray width of the spray gun, and start to spray evenly on the sheet metal parts. Different topcoats have different processes when spraying.

9) Polishing. Remedy and brighten defective topcoats.

Photo by Brother Choosing a Car) @2019

1: Dismantling of the whole car (removing all the sheet metal parts that may be involved or the parts where the painting work is carried out).

2: Car body repair (replacement, stretching, welding and other repairs caused by the impact or overturning of the iron plate dentation, beam bending, dimensional displacement and other injuries).

3. Sheet metal repair: all damaged parts should be repaired.

What is the automotive sheet metal workflow? Understand the process well, and it is not easy to be pitted when repairing the car!

Sheet metal painting is a kind of automobile repair technology, which is to repair the deformed part of the metal shell of the car. For example, if the shell of the car body is hit with a crater, it can be restored to its original state by sheet metal, and then the deformed metal surface of the car can be restored to its original brightness by spraying special paint. The basic process of automotive sheet metal painting is usually divided into four steps: sheet metal correction, sheet metal correction is for automotive sheet metal painting.

First, the preliminary plastic surgery work.

As we all know, how can a distorted and deformed body bring out the brilliance of paint? To put it bluntly, it is to restore the deformed parts, including the body shell, chassis girders, etc. At present, sheet metal correction has developed from the original "smashing welding and repair" to the secondary manufacturing assembly of the body.

Maintenance personnel should not only understand the technical parameters and dimensions of the body, but also master the material characteristics of the body, the characteristics of the force to transmit the deformation trend and stress point of the body and the production process of the body. Such as welding process and so on. On the basis of mastering these knowledge, maintenance personnel should also use advanced measuring tools, through accurate three-dimensional measurement of the body, to judge the direct and indirect damage and deformation of the body, develop a complete body repair plan, with the correct body repair plan, the key points of the body are restored to the original position.

Second, scraping ash shaping.

There are some irreparable defects after the car body is corrected by sheet metal, even if it is to replace the new parts will have imperfections, in order to achieve more perfect precision, it is necessary to use the craft technique of sculpture to make up for the defects, the car is damaged after deformation and other residual reasons, its flatness, wheel angle and line, each part needs to be filled with scraping ash to reshape out. Scraping = restoring the body skin = mold product = mold processing program. Any body skin of the car is stamped by the mold, and the repair of the body skin is the same as the repair of the mold, so we scrape the ash and shape the process to be coherent with the mold processing.

Many painters who have been working for many years will sigh a sentence "It is easy to spray a car, but it is difficult to make a piece of ash, and it is difficult to grind a lump of ash in ten years".

1: Sheet metal correction.

After we determine the plan, the first step is actually correction, and our maintenance personnel will use the corresponding tools and techniques to repair the deformed parts of our car according to the deformed Chengdu of our car. There are many ways to make sheet metal, including cutting, stretching and grinding, etc., in short, they will use various methods to restore our car to the maximum extent.

2: Finalization. When our car is corrected, it will definitely be different from other parts, because the vehicle has received damage after all.

At this time, the maintenance personnel need to shape the vehicle, apply putty to shape our body, and make the damaged parts as much as possible as before we were damaged. This operation is basically the same as our usual wall scraping putty, which requires patience and carefulness, which is a great test of the skills of maintenance personnel.

3: Spray paint. The third step is to spray paint, the process of painting is more troublesome, we must know that this work must be in a dust-free environment.

The steps must also be in place, showing the primer, followed by priming during the spraying process, followed by primer in sanding, dispelling hail and finally topcoat. In short, the process of sailing is very troublesome, but it must not be careless and sloppy, and in the end, it must not forget to dry the paint.

4: Paint finish.

The last step is to deal with the paint, if you want to make the car really not see the flaws, it is better to refine, as long as the problem is not very big, there will be no obvious difference, the whole process is relatively fine, this step seems simple, but it is essential. In fact, it is the finishing work, but it requires patient inspection, careful polishing, and grinding away the imperfections.