What is the process flow of automobile sheet metal repair?

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!

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).

The basic process of repair is the manual shaping and welding process of the plates. When carrying out the shaping operation of the plate, it is necessary to be familiar with the performance characteristics of the plate, select a reasonable repair process, and then determine the repair method according to the condition of the damaged part.

Automobile sheet metal is a technical means of automobile maintenance, if the appearance of the body is damaged and deformed, the process of sheet metal is required. It refers to the repair of the body after the collision of the car, that is, all the work except for the spraying of the body for anti-corrosion and decoration.

In order to ensure the quality and efficiency of the car body sheet metal repair work, it is necessary to make basic preliminary preparations before the formal repair work. Mainly from the body, damage and process, etc., only these three preparations are organically combined to prepare, so that the subsequent repair work can ensure good quality and efficiency. That is, by analyzing the body of the car and the damage condition, the appropriate repair technology is determined and selected.

Before the restoration can be carried out, a thorough analysis of the car body is carried out. This mainly includes the structural form of the body sheet metal, the composition of the body, the material type of the body, the welding process of the body, etc. Through a comprehensive analysis of the structure, material and welding process of the body, the appropriate sheet metal repair technology is determined to maximize the repair of the body and ensure the manufacturability and quality of the repair.

Before repairing, according to the specific situation of the body damage, determine the damaged area, judge the strength and direction of the collision when damaged, carry out a complete investigation and detection of the place where the body may be damaged, and carry out appropriate repair work according to the standard parameter size of the vehicle after the actual measurement of the body sheet metal, so as to ensure the refinement level of the body sheet metal repair work, so as to improve the quality of maintenance.

Through the various information of the body, the location area of the damaged sheet metal and the specific standard parameter size of the car, etc., a comprehensive synthesis is carried out, so as to select a scientific and reasonable sheet metal repair technology.

After making preparations before repairing, you should also pay attention to the following issues. First, the specific repair technology can be determined through the direct, indirect and inertial effects of the automobile body sheet metal and other parts that cause damage in the face; second, the welding process used can be determined according to the situation of the body material; Thirdly, in the process of correcting and stretching the deformed sheet metal, it is necessary to find the auxiliary support and position it before repairing it to ensure that the deformation of other parts of the body will not be affected; Fourthly, when carrying out welding and replacement parts, it is necessary to accurately locate the parts that need to be replaced, so as to avoid the correction of them again after the welding work is completed, and the overall maintenance efficiency is reduced.

There are two basic principles in the process of carrying out the repair work of car body sheet metal: the principle of economy and the principle of quality. In the process of body sheet metal repair, the first thing to consider is how to improve the economic benefits of repair.

But we can't just focus on economic benefits. Therefore, it is necessary to maximize the economy of the maintenance work under the premise of ensuring quality, taking into account the two principles and taking into account the comprehensive consideration of the restoration work.

For example, when carrying out partial tensile repair work on the right front door frame of the car, how to keep the sheet metal parts near the roof and left rear door frame from being affected, so as to avoid increasing unnecessary maintenance workload. When welding the bottom of the body, the car beam and other positions, how to make the metal internal structure will not develop large changes, to ensure that the thermal stress will not be excessively diffused. In addition, how to effectively solve the problem when maintenance personnel are unable to repair damaged sheet metal due to the space of maintenance equipment or tools.

Precautions and implementation principles are that it is necessary to pay attention to the protection of automobile sheet metal, not to destroy the automobile sheet metal, not to destroy the original paint of the car, to follow the work of automobile maintenance, should be implemented from a relatively small area.

In the process of sheet metal repair, the car should first inquire about the place where the fault occurred, and then carry out targeted repairs. Be sure to pay attention to the sturdiness of the interface.

According to the actual situation, pay attention to the condition of the body, so that you can better judge, better repair, and pay attention to the way of treatment.

When the automobile sheet metal is painted, it is first processed by the sheet metal worker, and then handed over to the painter to spray the paint. Sheet metal workers need to learn the use of basic equipment, such as grinding, dismantling, drawing, etc. Painters need to learn how to spray and dry masking, putty, and various paints.

The basic process of sheet metal painting is usually divided into five steps:

1. Confirm the plan: formulate the corresponding maintenance plan according to the severity of the vehicle collision. If it is a serious traffic accident, it will also involve the engine, gearbox, circuit, etc., and then it will need to be disassembled and repaired by the personnel of the machine repair department.

2. Sheet metal correction sheet metal correction needs to repair the deformed parts through corresponding maintenance equipment according to the degree of deformation of the body. Sheet metal includes cutting, grinding, stretching, receiving, oxygen regeneration, etc., the purpose of which is to restore the deformed parts to their original shape and maintain the original rigidity of the metal.

3. Scraping and shaping: There will be a lot of flaws and repair traces after the vehicle passes the sheet metal, which is an irreparable defect in the sheet metal work, even if the new parts are directly replaced, there will be imperfections, and then it is necessary to reshape the body waist line and flatness by scraping the ash. This process may seem simple, but it is actually a test of the worker's skill.

4. Spraying paint: The process of spraying paint is also relatively cumbersome, and there are also high requirements for the working environment, which needs to be carried out under dust-free conditions. Painting is mainly divided into the following steps:

Spraying the primer - spraying the primer - sanding the primer - mixing the paint - spraying the topcoat - drying the paint.

5. Paint treatment: Paint treatment is the last process in the whole sheet metal painting work. In fact, no matter how meticulous the work of the workers is, there will be some imperfections left behind, even some dust floating in the air will affect the whole effect, and then it can only be remedied by this link.

Usually the main remedy is to use very fine beauty sandpaper or sand with a polisher to achieve a "mirror" effect.

Sheet metal is required for car repairs when the vehicle is deformed in a collision and needs to be repaired. 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 characteristics of the body materials, the transmission of the characteristics of the force, the deformation trend and stress point of the body, and the production process of the body, such as the welding process. Many automotive sheet metal parts are welded together by spot welding, oxygen welding, arc welding or gas shielded welding, so sheet metal parts are required to have good welding performance.

When a vehicle is deformed due to a collision, it needs to be repaired with sheet metal. The bump damage caused by the impact should be repaired with sheet metal, and the bump of the sheet metal can be repaired by hammering or jacking up. Warped and skewed metal plates can be repaired using mechanical methods or flame heating percussion methods.

Automobile sheet metal is a technical means of automobile repair, which refers to the repair of the car body after the collision, that is, all other work except for body anti-corrosion and decorative spraying, such as body damage analysis, body measurement, body sheet metal forming, tensile correction, stress relief welding and assembly adjustment of body accessories. Usually if there is too much putty on the surface to be coated, or if the putty is not used properly, the pin ant first needs sheet metal. When the painted part is deformed, sheet metal is also required.

For the repair method of damaged or perforated metal plates, the surface of the perforated metal plate can be repaired by the application method. At present, the main adhesives used are epoxy resin adhesives, phenolic resin adhesives and copper oxide adhesives.

The main workflow of automotive sheet metal can be roughly divided into: vehicle disassembly, body repair, sheet metal parts repair, sheet metal parts repair, vehicle installation, and factory finishing. Each different process 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 working. To put it bluntly, if the exterior of the body is damaged or deformed, the process of sheet metal is required.

Automobile collision repair has developed from the initial "smashing and welding repair" to the secondary manufacturing and assembly of the body. The repair of the hit vehicle is no longer a simple car sheet metal runout, and the repair quality cannot rely solely on the appearance and cracks of the vehicle to be observed with the naked eye. The maintenance personnel must not only understand the technical parameters and external dimensions of the body, but also master the material characteristics of the body.

The stress feature can convey the deformation trend and stress points of the car body, as well as the production process of the car body, such as the welding process. On the basis of mastering these knowledge, maintenance personnel should also use advanced measurement tools and accurate three-dimensional measurement of the body to judge the direct or indirect damage and deformation of the body and the hidden dangers caused by the body deformation, and formulate a complete body repair plan. Then, with the help of correct repair technology and accurate weighing of the 3D dimensional data of each critical point, the body key points are restored to their original position, and the damaged body is restored to its factory condition.

In automobile manufacturing and repair, many sheet metal structures have very complex shapes. In order to avoid the difficulty of sheet metal, sheet metal materials must have good process performance requirements, namely:

1.Sheet metal materials must have good plasticity. It has the ability to produce permanent deformation without being destroyed by the action of external forces.

For cold-worked parts, good cold plasticity is required, such as stamping parts for auto parts; For hot-worked parts, good thermoplasticity is required, such as hot-forged spring steel plates and hot-riveted rivets.

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

3.** Inexpensive and economical. For any part of the car, when the working conditions are met, economy should be considered.

If ferrous metals can be used, there is no need for non-ferrous metals; If you can use non-ferrous metals, don't use ***. The life of automotive sheet metal parts should be compatible with the life of other parts of the car.

4.Good chemical stability. Automotive panels mostly work in the open air, often in contact with water and steam, especially like mufflers, often working in high temperatures and corrosive gases.

This requires that sheet metal parts must have good chemical stability, not only require strong corrosion resistance and rust resistance at room temperature, but also require no corrosion and deformation under high temperature or sunlight.

5.Good dimensional accuracy and internal quality of the plates. The dimensional accuracy and internal quality of sheet metal have a great influence on sheet metal processing, especially on formed parts.