How to distinguish the advantages and disadvantages of automobile sheet metal parts?

2019-10-08 09:48:27

According to Master Junjinluo, in order to distinguish the quality of sheet metal parts, we can start with packaging, weight, welding process, painting process and the degree of coincidence when loading. It is very difficult for ordinary car owners to distinguish whether the sheet metal parts are of high quality after handing in the car. It is better to distinguish them from the packaging of the products in advance. Generally, the products produced by small factories will not print the contact mode and the factory address. Besides the contact mode and the factory address, the regular manufacturers will also have steel stamps, qualifications and inspection labels on the products. And so on, even if consumers have problems in the future use process, they can also have a way to safeguard their rights.

Product weight is one of the inspection standards to measure the quality of sheet metal parts. In order to ensure the safety of automobiles, the steel plates used in automobile sheet metal parts must reach a certain weight. The weight of the original sheet metal parts and the high quality by-products should be almost the same, and if the sheet metal parts you buy are one third lighter than the original sheet metal parts, then you will undoubtedly buy a small factory product. As for welding technology, it is also a way to distinguish whether sheet metal parts come from large factories or not. Sheet metal parts manufactured by regular manufacturers will adopt mechanical cutting and welding operation mode. Their solder joints or trimming edges are smooth and smooth, and will not leave rough cutting edges.

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 coincidence degree of sheet metal parts in 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 also determine the difficulty of installation. Therefore, it is also a very concerned factor of many sheet metal maintenance masters. If the coincidence of sheet metal parts with the original car is low, such as the hole position can not be aligned, the error of gap and flatness in loading workshop is too large (the one-way tolerance of high-quality sheet metal parts in this respect should be controlled below 1.0 mm), then it can be basically determined that this is an unqualified product from a small factory. Luo Shifu said that few car owners have noticed that a strong collision will cause slight deformation of the whole body, and then if the larger clearance sheet metal parts are installed again, it will cause the body deformation again, affecting the damaged vehicle to restore its original appearance and quality. Although experienced sheet metal technicians will eventually adjust the sheet metal parts through drilling, grinding and welding to a better loading effect, it will be time-consuming and laborious, and the quality and life of the sheet metal parts are not as good as those manufactured by mechanical precision. Therefore, when choosing and purchasing, the owners should choose the original parts or the first-class auxiliary parts that match the gap of the original workshop. When installing, they can be in place step by step to avoid or reduce the damage caused by "secondary processing" by the master of sheet metal.

Above is some knowledge of distinguishing the quality of automobile sheet metal parts, hoping to give some help to the owners and friends who need to buy sheet metal parts. Of course, it does not mean that the selection of high-quality sheet metal products can be completely carefree. Like many parts of automobiles, sheet metal also needs reasonable use and maintenance. The key to prolong the service life of sheet metal parts is to minimize open-air parking and driving in sand water, and to regularly spray paint on the inner side of sheet metal parts to prevent rust.