In the repair of automobile sheet metal, how to collect the fire?

Hello! Automobile sheet metal repair, the handling of fire:

1) Check whether the area is too large, first use a slightly larger hammer to flatten, pay attention to the strength of the hammer, too much will aggravate the secondary damage of the wound surface.

2) After leveling, close the highest point first and heat it with a welding torch, but the area should not be too large, and the speed of collecting from the outside to the inside should be fast.

3) Inject water to cool down before cooling.

4) Use the repair machine gun head to resist the gun, press hard to the high point when shooting, and wipe it with a wet towel immediately after pressing.

The main purpose of collecting the iron sheet is to eliminate the extended plate by using the principle of rapid cold contraction after thermal expansion.

Hope it helps you, hope!

The fire collection treatment in sheet metal is a kind of treatment after the collision and extension of the iron plate according to the principle of thermal expansion and cold contraction. It is the basic technology of sheet metal, first of all, we should pay attention to the landing point, and secondly, we should tap the iron plate, do not use force, and stretch slowly. The final key is to close the fire as few points as possible, so that when the front hood and roof are closed, the arc is small and the area is large, so that there will be no collapse.

Collecting the fire technique is a personal feeling in practice, and I suggest that you first find a scrapped car door to practice.

When automotive sheet metal processing, due to the bending, drawing, stamping and other processes involved, it may cause the steel surface to be deformed by tension and compression, which will lead to changes in steel hardness and toughness. In this case, the use of flame for rewinding can restore the original hardness and toughness of the steel, thereby improving the processability and strength of the steel.

Harvesting is achieved by a process of heating and cooling. Specifically, there are usually two phases of fire-removal: heating and cooling.

First, the steel is heated with a flame to bring it to a certain temperature. Then, the steel is rapidly cooled to make its internal structure change accordingly, so that the hardness and toughness of the steel can be adjusted and improved due to the lack of silver.

The performance of automobile sheet metal can be improved by closing the fire, improving the toughness and strength of the steel, increasing its wear resistance and durability, thereby prolonging the service life of the car. At the same time, the fire collection can also make the automotive sheet metal easier to process and install, and improve the production efficiency and quality.

The main process of automobile sheet metal work can be roughly divided into: whole car disassembly, car body repair, sheet metal repair, sheet metal maintenance, whole car installation, and factory finish. Each of these processes can be subdivided into several processes.

Automobile sheet metal is a technical means of automobile repair.

Automobile sheet metal is a processing method for automobile maintenance, also known as cold work, to say that directly, if the appearance of the body is damaged and deformed, the process of sheet metal is needed.

Automobile collision repair has developed from the original "smashing, pulling and welding repair" to the secondary manufacturing assembly of the body. The repair of the collision accident vehicle is no longer a simple knocking on the sheet metal of the car, and the quality of the repair cannot be observed by the naked eye alone. 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, the deformation trend and stress point of the body, and the production process of the body, such as welding process.

On the basis of mastering these knowledge, maintenance personnel should also use advanced measurement tools to judge the direct and indirect damage and deformation of the body through accurate three-dimensional measurement of the body, as well as the hidden dangers due to the deformation of the body, and formulate a complete body repair plan, and then cooperate with the correct maintenance process and accurate three-dimensional data of each key point of the body, restore the key points of the body to the original position and restore the damaged body to the state when it left the factory.

In automobile manufacturing and maintenance, the shape of many sheet metal structural parts is very complex, in order to avoid the difficulty of the plate, the sheet metal material must have good process performance requirements, namely:

1. The sheet metal material must have good plasticity. It is necessary to have the ability to produce permanent deformation without being destroyed under the action of external forces. For cold work parts, it is necessary to have good cold plasticity, such as stamping parts of automobile parts; For hot work parts, it is necessary to have good thermoplasticity, such as hot forgings, spring steel plates, hot rivets, etc.

2. Good weldability, materials with good weldability have high welding strength and small cracking tendency.

3. Cheap, economical and practical. For any component of the car, economy should be taken into account if the working conditions are met. If ferrous metals can be used, non-ferrous metals are not used; Non-ferrous metals can be used, but precious metals are never used.

The life of automobile sheet metal components should be compatible with the life of other automobile components.

4. Good chemical stability. Most of the car panels work in the open air, often in contact with water and steam, especially like mufflers, often working at higher temperatures and corrosive gases. This requires that sheet metal parts must have good chemical stability, which not only requires corrosion resistance and strong rust resistance at room temperature, but also requires that they are not corroded and deformed under high temperature or sun exposure.

5. Good dimensional accuracy and intrinsic quality of the plate. The dimensional accuracy and intrinsic quality of the plate have a great influence on sheet metal processing, especially on molded parts.