[China Aluminum Network] It is not unfamiliar to mention aluminum alloy wheels. When buying a car, it will be weighed and compared by consumers as an important reference indicator for appearance and configuration. In fact, I completely agree with this approach, because the aluminum wheel hub has the advantage that the steel wheel hub cannot match, has the greater influence to the future driving.

Aluminum alloy wheels have many advantages over steel wheels:

First, good heat dissipation: aluminum alloy heat transfer coefficient is three times larger than steel. The friction between the tire and the ground and between the brake disc and the brake pad during the running of the car generates a very high heat, which may cause the tire and the brake pad to age and accelerate the wear, and the braking performance will be drastically reduced due to the high temperature. Tire pressure will also increase there is a puncture hazard. Aluminum alloy wheels can transfer this heat into the air faster than steel hubs, increasing the safety factor.

Second, light weight: the proportion of aluminum alloy wheels is less than steel wheels, each on average about two kilograms lighter than the same size steel wheels, in addition to spare wheels can reduce the weight of eight kilograms; lighter wheels can also reduce start-up and acceleration The resistance, the two together make the vehicle more fuel-efficient.

Third, the high precision: Aluminum alloy wheel casting precision is much higher than the steel wheel hub, out-of-roundness and unbalanced weight is small; In addition, aluminum alloy's small elastic modulus, vibration resistance is superior to steel wheels. These two items can effectively reduce vehicle vibration and make driving more comfortable.

Fourth, more beautiful: aluminum alloy in the liquid state of high temperature fluidity and tension better than steel wheels, polishing and plating process to enable it to produce a more beautiful and changeable appearance; surface anti-corrosion treatment and electrostatic powder coating It also makes it last as new.

Alloy wheel deformation can be repaired?

I personally think it is OK. There are many professional agencies that repair deformation of aluminum alloy wheels. But for safety reasons, it is still new.

These stores not only promote the deformation of the rims, but even repair the cracks. As the saying goes, don't look at advertising to see the effect.

Can the actual strength of these repaired rims meet the safety standards? The following figure shows BMW's criteria for rim deformation:

The 0.3mm limit of bouncing yaw set by BMW is a very strict requirement. All rims with a yaw greater than 0.3mm can only be scrapped and replaced with new rims.

A friend may say that BMW's mandatory scrapping of out-of-round-deformed rims does not mean that there is no maintenance value for this hub. It is only that Germans have high salaries, and the repaired labor costs may be more expensive than buying a new batch of new rims. Of course, this is also a seemingly convincing reason.

Why does BMW want to force scrapped deformed wheels?

Because people have a hundred years of experience while respecting science. We start with the classification of aluminum alloys. The concept of aluminum alloy is too broad. According to the processing method, it can be divided into two types: deformed aluminum alloy and cast aluminum alloy. The deformable aluminum alloy is divided into non-heat-treatable aluminum alloy and heat-treatable aluminum alloy. The deformed aluminum alloy has excellent plasticity (a relatively high aluminum content) and can be further processed and deformed in a hot state and a cold state. Single phase solid solution can be formed when heating, good plasticity, suitable for processing and forming. If the aluminum alloy hub is made of deformable aluminum alloy that can be heat-treated and strengthened, it is of course feasible to perform the deformation repair in a hot or cold state, but it is regrettable that the aluminum alloy rim is not made of a deformed aluminum alloy.

Since the aluminum alloy hub has a light weight and a high manufacturing precision, the deformation is small and the inertial resistance is small at high-speed rotation. This helps to improve the straight-line driving performance of the car and reduce the rolling resistance of the tire, thereby reducing fuel consumption.

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