[Chinalco.com] Peter von Siemens, president of Siemens AG, Germany, said in response to a reporter's question: “To comply with corporate ethics and strive for excellence in manufacturing products is our innate vocation and obligation to German companies!†Yes, With this dedication to the quality of their products, the Germans created a miracle of 80 million people with more than 2,300 world brands. However, after all, companies aim at profitability. Germans' "excellence in product quality" is based on "complying with corporate ethics." In the current environment where morality is lacking in mainland China, certain products are non-functional. Excessive lifting of sexual quality standards will have many side effects. For example, excessive requirements on the appearance quality of aluminum alloy wheels may cause safety hazards.
The quality of aluminum alloy wheels generally refers to two aspects: the intrinsic quality and the appearance quality. The intrinsic quality refers to the natural properties of the products such as mechanical properties, processing dimensions, dynamic balance, and airtightness, and the intrinsic quality is indiscernible to the naked eye. Its quality is directly related to the safety and comfort of driving; and the appearance quality refers to whether the surface of the wheel has scratches, scratches, dust, sagging, orange peel, color difference, and the consistency of knife marks. In general, the quality of appearance does not affect the safety and comfort of the vehicle. It merely does not meet the aesthetic standards of aluminum alloy hub products. There is also a characteristic of appearance quality, that is, different people's evaluation of the appearance of aluminum alloy wheels. Deviation.
I have had this experience during the work of the aluminum alloy wheel factory. I often find some non-professional inspectors in the defective product area of ​​the final inspection. The quality of the appearance is judged as defective without any problems. Wheels, these products are mostly foreign OEMs and overseas A/Fs, especially Japanese OEMs and Japanese exporters, and the types of products are mostly glossy (I believe that anybody who has worked in aluminum hubs People have had similar experiences with me, especially those who work at the production site. The main reason for this situation is that some aluminum wheel users have nearly stringent requirements on the appearance quality of products. In recent years, this trend has intensified, and even some domestic three-stream car companies have followed the trend, and have raised the appearance quality standards of aluminum alloy wheels. Intangible increase in the production costs of suppliers, but also for the end-users buries the root causes of insecurity.
In theory, in the production process of aluminum alloy wheels, all unqualified products should be remelted, but increasing cost pressures and instincts to pursue profits have prompted all aluminum wheel manufacturers to choose the best possible pair. Products with defects in appearance are returned for repair. As long as the product size is not out of tolerance, individual products will be repaired twice or more than three times before delivery.
The rework of aluminum wheels is mainly aimed at finished products with appearance defects after the coating process. The appearance defects of aluminum wheels are removed by grinding, shot blasting or turning, and the coating process is re-applied. This process mainly involves It is the process of shot blasting, machining and painting after heat treatment. In accordance with the requirements of the production process, the aluminum alloy hub needs to conduct spot inspection of the tensile strength, elongation, hardness, and other mechanical properties of the product after the heat treatment process. After comprehensive judgment, the batch of products can be transferred to the machining process for further processing. During the processing and subsequent processes, the inspectors only check whether the relevant dimensions of the product are excessively poor, airtight, dynamic balance, and paint film indicators, and the mechanical properties of the product are no longer detected, that is, all the rework wheels are recoated. After installation, there is no chance to perform inspection of mechanical properties. The repair product will be sold by the factory that is regarded as the default for mechanical performance by default. However, the problem is exactly here.
It is well known that the pretreatment of the aluminum alloy wheel coating process and the curing of the paint are performed at a certain temperature. The process temperature range is approximately between 120° C. and 200° C., even for a relatively simple coating process, each wheel. The accumulated heating time in this temperature range will also exceed tens of minutes, while the aluminum alloy wheels usually perform the heat treatment process temperature (140°C~180°C) within this range, which means that the aluminum alloy wheels are coated once every time. The installation is equivalent to short-term artificial aging again. Experiments show that A356 alloy will prolong its aging time after T6 treatment, which will reduce the elongation of the alloy and reduce the plasticity, which means that over-ageing (artificial aging time) of the aluminum alloy wheels in extreme cases It will break more easily. Therefore, the more aluminum alloy hubs are reworked, the more likely they are to crash. The higher the appearance quality of the aluminum alloy wheels, the higher the product's return rate, so that it is too much for the aluminum alloy wheels. The demanding appearance quality will bring hidden danger to traffic safety!
It is precisely for this reason that we hereby solemnly appeal to OEMs and overseas aluminum wheel dealers not to overlook safety in order to be beautiful and not to be too picky about the appearance quality of aluminum alloy wheels, especially some domestic three-stream automobile manufacturers. , regardless of your car is made of what grade, based on a layer of sunny, rainy weather with Chinese characteristics of road conditions, you still follow the meaning of it? Can you guarantee that your consumers will clean the vehicles and wheels on a daily basis? I also hope that the relevant industry associations will have the opportunity to say fair words to aluminum wheel manufacturers. After all, they are still weak in front of car companies. After all, we all have the opportunity to drive and drive. Who can guarantee that the wheels on your car are not A repair wheel that has been repaired many times?
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