How to distinguish the quality of automobile sheet metal parts?

2019-10-22 09:47:24

The sheet metal parts of automobile generally refer to the metal shell of automobile, which is usually made of steel plate. On the basis of ensuring certain strength, it is the basic requirement to reduce the weight as much as possible. In addition to the role of protection and beauty, automobile sheet metal parts are also the main carrier of automobile gas resistance. Therefore, the quality and service life of automobile sheet metal parts not only affect the appearance of automobile, but also increase the resistance of air to automobile due to the quality and deformation, so as to reduce its economy.

Automobile sheet metal parts can be divided into two categories according to the manufacturer: original parts and auxiliary parts. The so-called "original factory" generally refers to the matched loading parts for the whole vehicle factory; "Auxiliary Factory" refers to the non matched parts produced by non matched manufacturers. The price of most of the original parts is higher than that of the auxiliary parts. Most people think that the original parts replaced in the special maintenance station or purchased in the auto parts market should be the same as the original car, in fact, there will be big or small differences. For example, the "original" type of sheet metal parts can also be divided into several levels: the first level is of good quality, which is a special loading part, that is, the original car belt, which can not be bought outside; the second level is for the special maintenance station, which is not much different from the first level in terms of product itself, except for the gap that may be brought by the process during installation or replacement; the third level is the spare part production that flows to the retail market Although the price of the original parts is still high, the quality of the products can't be compared with that of the original cars. The product quality of "sub factory" parts is also mixed: the products of automobile sheet metal parts of the first level "sub factory" can almost match the original factory parts, most of which come from the manufacturers with strong capital and hardware strength, which can guarantee the standardization from material selection to assembly line mechanical operation; the second level "sub factory" parts are inferior to the first level products in terms of materials and manufacturing process; the second level "sub factory" parts are inferior to the first level products. It's just to make up for the number. There's no quality to speak of. It's just to cover up consumers with low prices. Some maintenance stations operate in violation of regulations. The so-called original factory parts are actually inferior "Auxiliary Factory Parts" wholesale from the auto parts market. In order to make huge profits, they will sell them to the car owners under the banner of "original factory", and their prices will naturally be much higher than the auto parts market. So, how to distinguish the advantages and disadvantages of sheet metal parts?

To distinguish the quality of sheet metal parts, we can start from packaging, weight, welding process, painting process and the degree of fit when loading. It's very difficult for ordinary car owners to distinguish whether the sheet metal parts are of high quality after delivery. We might as well distinguish from the packaging of the products in advance: generally, the products produced by small factories will not be printed with contact information and address, while the regular manufacturers will have steel seal, qualification and test label on the products in addition to contact information and address, even if the consumers come out in the process of use in the future. At present, there can also be a way of safeguarding rights.

Product weight is one of the inspection standards to measure the quality of sheet metal parts. In order to ensure the safety of automobile, the steel plate used in automobile sheet metal parts must reach a certain weight. The weight of the original sheet metal parts and the high-quality subsidiary sheet metal parts should be almost the same, and if the sheet metal parts you buy are one third lighter than the original sheet metal parts, you will undoubtedly buy a small factory product. As for welding process, it is also a method to distinguish whether sheet metal parts come from large factories. The sheet metal parts produced by regular manufacturers will adopt the operation mode of mechanical cutting and welding, and their welding points or cutting edges are smooth and flat, and the rough edges of the cutting hands will not be left.

Many car owners think that the body parts still need to be painted with the same color as the original car, so they will ignore the painting process of the body parts when choosing the body parts, which is irrelevant, but this idea is not correct. In order to prevent oxidation and corrosion, the body parts need to be painted before leaving the factory. Indeed, the painting link after replacing the body parts can not only color them, but also protect and prevent oxidation. However, if it is a small factory body parts, the painting treatment during production has uneven adsorption and foaming, which will affect the effect of post painting. In the process of using, it is easy to fall off, lead to corrosion, affect and damage the quality of sheet metal parts.

The fitting degree of sheet metal parts during loading is also a key point to distinguish the quality of sheet metal parts. It will determine whether the final effect of loading is beautiful or not, and at the same time determine the difficulty of installation. Therefore, it is also a factor that many sheet metal maintenance technicians are very concerned about. If the fitting degree of sheet metal parts and the original car is low, such as the hole position cannot be aligned, the error of loading clearance and flatness is too large (the one-way tolerance of high-quality sheet metal parts in this respect should be controlled below 1.0mm), it can be basically judged that this is a non-conforming product from a small factory. Mr. Luo said that few car owners have noticed that a strong collision will cause slight deformation of the whole car body. At this time, if you install the sheet metal parts with large clearance, it will cause the car body to deform again, affecting the recovery of the damaged vehicle to its original appearance and quality. Although experienced sheet metal technicians will eventually adjust the sheet metal parts to a better loading effect through drilling, grinding and welding, it will be more time-consuming and laborious. In addition, the quality and service life of the sheet metal parts are not as good as those made precisely by machinery. Therefore, it is better for car owners to select the original factory parts or the first-class auxiliary factory parts that are consistent with the gap of the original workshop when purchasing. When installing, they can be in place in one step to avoid or reduce the damage caused by the "secondary processing" of sheet metal masters.

That's resolution.