What are the characteristics and modeling requirements of auto parts sheet metal parts?

2020-05-19 11:32:53

Automobile sheet metal parts is a processing method of automobile maintenance, also called cold work. Say directly, if the exterior of the car body is damaged or deformed, the process of sheet metal is needed to restore the original appearance. The basic tool is a hammer. Hammers with different shapes are padded with iron blocks at the back of the sheet metal parts, which are hammered repeatedly to form. Appearance restorers are also used when necessary.

Automobile sheet metal parts is a processing method of automobile maintenance, also called cold work. Say directly, if the exterior of the car body is damaged or deformed, the process of sheet metal is needed to restore the original appearance. The basic tool is a hammer. Hammers with different shapes are padded with iron blocks at the back of the sheet metal parts, which are hammered repeatedly to form. When necessary, you need to use the appearance restorer. This thing belongs to welding. Weld the iron ring on the body and pull it out with the hook. Used to repair sunken areas. It's difficult for a large flat car body to get back to its original position, so sometimes fire collection is also used. It means that the iron sheet shrinks after local heating and cooling. The ultimate goal is to restore the damaged body.

Many car owners don't know the operation process very well. Here is a summary of the whole process of sheet metal repair

(1) Sheet metal removal. Remove the sheet metal parts of the damaged parts of the collision vehicle from the original body by cutting, etc.

(2) Damage identification. After cleaning the damaged parts, confirm the degree of damage, so as to establish the repair method.

(3) Remove old paint film. Grind the original paint of the damaged part to expose the iron plate layer.

(4) Flat sheet metal parts. According to the damage degree of the sheet metal parts, the corresponding sheet metal tools are used to level the concave parts. After the flattening operation, the surface of the sheet metal parts shall be precisely adjusted for flatness.

(5) Fire collection treatment. The tensile and extrusion stresses produced in the process of metal recovering to its original shape and thickness are eliminated by fire collection, and the rigidity and strength of sheet metal parts are maintained.

(6) Grind the feather edge. A buffer slope surface shall be polished at the connection part 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.

(7) Apply epoxy primer. Clean and degrease the polished damaged surface again, apply epoxy primer and dry it for rust prevention. The above sheet metal operation procedures are applicable to sheet metal parts with little damage. If the car body collides seriously and injures the frame, it is necessary to rectify the whole car frame on the frame straightening machine, and the operation will be more difficult.

Painting operation process (continue the above body work process):

(1) Scrape and apply atomic ash. After cleaning and degreasing the damaged sheet metal parts coated with epoxy primer, apply atomic ash, which is often called putty. After the atomic ash is dried, polish it and confirm the stamping line.

(2) Apply primer during spraying. Clean and degrease after polishing with atomic ash, start to apply primer during spraying, and dry it. When applying the primer during spraying, it is necessary to cover the parts that do not need spraying.

(3) Apply primer during grinding. Polish the primer to the same height as the original paint surface, and confirm the flatness.

(4) Paint mixing. Although the original factory paint is generally available in the special service shop at present, because the color of the finish paint is different from that of the original factory paint after the vehicle has been used for a long time, the paint spraying personnel are required to mix the paint manually.

(5) Apply top coat. Add the adjusted finish paint into the spray gun tank, adjust the air pressure, paint output and spray range of the spray gun, and start to spray evenly on the sheet metal parts. The process of spraying different topcoats is also different. In fact, the literal understanding of sheet metal is: sheet metal, that is, the meaning of sheet, is the meaning of series processing of thin metal plates, including folding, shearing, punching, welding, riveting, splicing and other processes.