How to Deal with the Surface of Automobile Sheet Metal?

2019-07-05 10:43:54

Many car owners believe that the same color of car paint is needed after the sheet metal parts are sprayed, so the spraying process of sheet metal parts will be neglected in the selection of sheet metal parts, thinking that it is not important, but this idea is incorrect. In order to prevent oxidation and rust, sheet metal parts need to be sprayed before they leave the factory. Indeed, the spraying links after replacing sheet metal parts can not only tone their colors, but also protect and prevent oxidation. However, if it is a sheet metal part in a small factory, the spraying treatment during its production is not uniform in adsorption and foaming. In case of situation, it will affect the effect of post-spraying, leading to its easy to fall off, cause rust, and affect and damage the quality of sheet metal parts.

The so-called sheet metal refers to the products processed by sheet metal technology. Sheet metal has been widely used in our daily life. Sheet metal has the characteristics of light weight, high strength, conductivity (which can be used for electromagnetic shielding), low cost and good mass production performance. The common problem in the use process is rust on the surface. When faced with such similar problems, automotive stamping parts manufacturers remind us what methods to take to deal with them.

There are two main ways to deal with the surface problems of sheet metal parts:

Clearance treatment

In steel and copper sheets, the corrosion, dirt and oxide scales of their outer layers will affect the sheets, and cracks, pore and so on may occur. So we have to do shape cleaning before connecting. Generally speaking, we can use pickling method and mechanical method to deal with it.

Softening treatment

In fact, he is to eliminate the residual stress during work hardening and production, so that it can be restored to its original plasticity, so we need to soften. Generally speaking, according to the requirements of softening, we can be divided into isothermal annealing, full annealing, stress annealing and recrystallization annealing.

Stainless steel is heavier than steel and aluminium alloy, which leads to higher fuel consumption?

First of all, the density difference between stainless steel and ordinary steel is not very big. The density of Q series cold rolled steel is about 7.85 kg/cm3. Among the stainless steel, 317L stainless steel is the most dense, and the density is 8.25 kg/cm3. The weight of white body accounts for about 20%~30% of the whole vehicle weight. Even if the weight of white body is 300 kg, stainless steel can not be calculated. The volume of the steel used is 300/7.85_38 cm3 instead of the hot-formed steel in the white body, so even if all the steel is replaced by stainless steel, the added weight is 38 cm3 ((8.25-7.85) kg/cm3_15 kg), the weight can be completely neglected.

In addition, the steel used in various parts of the body sheet metal is also different, such as the engine cover and tailbox cover, the use of lightweight laminated steel plate, this steel plate has a good sound absorption and shock absorption capacity, if replaced by stainless steel plate, the NVH of the vehicle can not be guaranteed.