1 main features
Aluminum alloy wheel [gu (three sounds)] advantages
First, it is generally believed that the aluminum alloy wheel hub is better than the steel wheel hub. The reason is nothing more than the following:
1. Beautiful and generous.
2. Light and fuel efficient;
3. The aluminum alloy has high expansion ratio and good elasticity;
4. Heat dissipation: Aluminum alloy has better thermal conductivity than steel.
5. Good rigidity, good roundness, not suitable for deformation, all parts of the car are small, suitable for high-speed driving; steel is soft, easy to deform, four-wheel positioning is useless, and the car will vibrate at high speed (above 160). Affect the life of the car;
6 Good elasticity, improve the ride smoothness of the vehicle, and absorb vibration and noise in motion more easily.
Aluminum alloy wheel shortcomings
This kind of wheel hub is slightly less durable and cannot be repaired once it encounters a hard object collision.
Aluminum alloy wheels are available in 1-piece, 2-piece and 3-piece versions.
For high-speed cars, it is not uncommon for punctures and brakes to be degraded due to high temperatures caused by deformation and braking of steel hubs. The heat transfer coefficient of aluminum alloy is three times larger than that of steel and iron, and the heat dissipation effect is naturally much better, thereby enhancing the braking efficiency, improving the service life of the tire and the brake disc, and effectively ensuring the safe driving of the automobile.
Automobiles equipped with aluminum alloy wheels generally use radial tires. The cushioning and shock absorbing performance of radial tires is superior to that of ordinary tires. In this way, the comfort of the car will be greatly improved when it is on an uneven road or at a high speed.
Since the aluminum alloy wheel is light in weight (about 2 kg from the aluminum or steel hub of the same specification) and has high manufacturing precision, the deformation is small at high speed and the inertia resistance is small. This is beneficial to improve the straight running performance of the car and reduce the rolling resistance of the tire, thereby reducing fuel consumption.
2 How to choose the “excellent” and “bad” of aluminum wheels:
Excellent: Aluminum wheels have gradually replaced the position of steel wheels because of their light weight, good heat dissipation and good appearance.
The light weight reduces the self-weight of the whole vehicle; the heat dissipation is good, and the heat of the brake can be dissipated in time to avoid the brake heat decay and affect the driving safety. When driving, the silver line passes like a light foot.
Inferior: Aluminum alloy is brittle, it is easy to appear small cracks, and it is not easy to be found. Its strength is not as high as steel material. There may be sand holes in casting. The tubeless tires are prone to loss and the price is relatively high.
The basic principle of choosing a hub or hub cap - must be easy to clean.
Don't blindly pursue beautiful, complex hubs or hubcaps that are cumbersome to wash. Beautiful, simple and easy to clean is the best.
1, quality and safety performance. When buying, look for the brand.
2, the bright surface of the wheel mainly depends on the surface and the inner circle whether there is a pinhole. If there is a pinhole, it indicates that there is a problem with the casting quality of the product. Then, if there is any crack, whether there is a tingling feeling on the back of the finger or not, and whether the non-machined surface of the wheel is smooth is also a sign for judging the quality of the brand.
3, the contrast of the paint surface brightness, good brand paint gloss is vivid, and some brands make people feel dull. In coastal or wet snow and ice areas, choose a fully coated aluminum ring that is not easily corroded.
Because of the high price of the aluminum alloy material, there are many people who use the wheel hub cover to beautify the wheels. These wheel hubs are often used to "pretend" aluminum wheels. If you really want to buckle the hubcap as long as the caliber is the same, any car's hubcap can be used. For example, 14-inch, then Audi, Passat, Tianba, Corsica and other car covers can be used, just pick what you like. Since the price is cheap, you should choose a relatively good quality. If a dozen yuan is broken in a few days, it is still not worthwhile.
3 production technology casting
Low pressure casting is the most basic method for producing aluminum wheels and is also economical. Low-pressure casting involves casting molten metal into a mold and hardening it. Counter-pressure casting is a more advanced casting method. The suction generated by high vacuum sucks the metal into the mold, which is beneficial to maintain the constant temperature and eliminate impurities. There is no pore in the casting and the density is uniform and the strength is high. The aluminum wheel hub produced by the high pressure die casting (HCM) process is almost the same as the forged one. The RX/RY (15-20 inch) series aluminum wheel of the German factory BBS is cast by HCM method.
Aluminum alloy wheel
Forging is the most advanced method of manufacturing aluminum wheels, pressing an aluminum ingot under heat to a wheel hub at a pressure of 62.3 MN. The strength of this aluminum hub is three times that of a typical aluminum hub, and the former is 20% lighter than the latter. Some wheels with beautiful shapes and relatively complicated structures are often impossible to forge once. Roll forging (also called die forging) is a type of forging that forges a blank of a hub into a roll. Roll-forged hubs can reduce thickness while maintaining sufficient strength. The aluminum alloy wheel hub manufactured by this process has a uniform density, a smooth surface, a thin wall, a light weight, and can withstand a large pressure. However, since this product requires relatively sophisticated production equipment and the yield is only 50%-60%, the manufacturing cost is slightly higher and the price is naturally not low.
4 maintenance methods
When the temperature of the hub is high, it should be allowed to cool naturally before cleaning. Never use cold water for cleaning. Otherwise, the aluminum alloy wheel hub will be damaged, and even the brake disc will be deformed to affect the braking effect. In addition, cleaning the aluminum platform gold hub with a cleaning agent at high temperatures will cause a chemical reaction on the surface of the hub, which will lose its luster and affect the appearance. When the hub is covered with hard-to-remove tar, if the general cleaning agent does not help, try to remove it with a brush, but do not use a hard brush, especially an iron brush, to avoid damaging the hub surface. Here, the private car owners are introduced to a remedy for removing tar: that is, using a medicinal "active oil" to rub, you can get unexpected results, give it a try.
1. Wash off the sand adhering to the surface of the hub and the dirt that is easy to damage the hub, otherwise the surface of the alloy will be corroded and damaged;
2. Treat the inner and outer surfaces of the hub with an acid-proof cleaner. It is best to apply wax to the hub every 2 months, which can extend the service life of the hub;
3. In order not to damage the protective layer of the hub surface itself, paint brighteners or other abrasive materials cannot be used on the hub. When the alloy protective paint is damaged, if there is a scratch on the hard object during driving, the alloy wheel hub should be repaired and repainted as soon as possible at the professional repair station.
5 wheel repair
There are very few repair shops in the country that can be repaired. The largest wheel refurbishment repair shop is the ... He is a set of wheel repair, refurbishment, correction, welding, grinding, polishing, painting. An integrated national wheel tire 4S shop.
6 advantages and disadvantages
The aluminum alloy wheel hub for automobile is made of aluminum alloy, and its production process is divided into casting and forging.
The aluminum alloy wheel is divided into the following four characteristics:
1 Improve the comfort of driving. The aluminum alloy wheel has the metal characteristics of absorbing vibration and rebounding force. The dimensional accuracy of the CNC machine tool, high roundness, small yaw and good balance make the car run smoothly and comfortably.
2 Normal driving, saving fuel. Due to the weight of the aluminum alloy wheel, the four-wheel rotation inertia is reduced, the acceleration of the car is improved, and the braking energy demand is relatively reduced, thereby reducing fuel consumption.
3 Improve the safety of driving. The dispersion coefficient of aluminum alloy wheels is two to three times that of ordinary steel wheels. Together with the structural characteristics of aluminum alloy wheels, it is easy to dissipate the heat generated by tires and brake systems in the air. Medium. Even in the case of continuous braking in long driving, the wheel system can maintain proper temperature.
4 Improve the beauty of the whole car. The aluminum alloy wheel has a beautiful design and diversified shapes. It can make the car and the hub united together and perfect. Improve the aesthetics of the whole car.
5 Improve driving stability. Tire widened to improve grip, braking performance, and effectively improve the handling and driving pleasure of driving.
Aluminum alloy wheels also have certain disadvantages, as follows:
1 High cost. It takes a lot of money to replace the alloy wheel.
2 The modified vehicle damper is slightly hardened because the flatness ratio of the modified tire is low, so there is a slight feeling of vibration and hardening.
3 Increasing the size of the hub will increase the fuel slightly, but there is no fuel change in the replacement of brand-name tires.