Is an all aluminum body really better than a rigid body?

Careful car owners may have found that the weight of new energy vehicles is generally a little heavier than that of traditional fuel vehicles. The reason is actually very simple, in order to improve the endurance performance of new energy vehicles, car manufacturers can only continue to increase the number of battery packs to improve the endurance performance when the battery technology is temporarily unable to break through the bottleneck period, and the increase in the weight of the vehicle is inevitable. But at the same time, the heavier body will inevitably have a negative impact on the range, as well as many other aspects of performance, such as braking and braking handling.

So what can be done to improve the battery life while trying to avoid the negative impact of weight gain? The answer is simple, it is to continue to seek a path to lightweighting. This is not only the appeal of new energy vehicles, but also the eternal theme of countless performance vehicles to surpass themselves.

At present, one of the ways we can come into contact with lightweight is to use all-aluminum bodies, but most of them are used in some mid-to-high-end models, such as the familiar Audi A8L and Jaguar and other models.

What are the advantages of using aluminum to build a car? Another advantage of the all-aluminum body is that after the aluminum material comes into contact with the air, because the oxidation reaction will form a layer of oxide film on the surface, the car body is not easy to rust, and it is more sought after by today's car companies from an aesthetic point of view.

In addition, the material of aluminum is a little more "soft" than steel, and it is easier to show a beautiful body arc when using aluminum to make the body, and it can bring greater visual impact to the young people whose appearance is justice in terms of appearance design, such as the Jaguar classic car E-type in the picture below, it is almost difficult for you to find a straight line in the appearance.

Since the all-aluminum body is so good, why do some car companies still choose to give up the all-aluminum body? First of all, the manufacturing and processing technology of the all-aluminum body is more complicated, which also leads to the fact that the all-aluminum body is still relatively expensive at this stage. If some accidents occur, it is difficult to use the current general body repair equipment to repair, so the later plastic repair is high.

In terms of safety, the deformation resistance of hot-stamping steel is far greater than that of ultra-aluminum alloy, the tensile strength of ultra-high-strength hot-stamping steel has exceeded 2000MPa, and the most powerful 7-series aluminum alloy is only about 540MPa, so many cars use higher-strength hot-stamping steel in the A-pillar and some parts that need to withstand impact force in the event of an accident.

However, the mixed use of steel and aluminum has high manufacturing requirements for car companies, because steel and aluminum are different metal materials, and their physical and chemical properties are also very different. There are also great differences in the stamping, joining, and painting processes, and in today's world, when this technology is difficult to popularize in batches, such a complex thing can only be played by more than a million luxury cars.

Written in the end before the new Mercedes-Benz e was launched, because in some places of the body with steel instead of aluminum, there was a lot of uproar, I think Mercedes-Benz itself also has its own considerations, the benefits of using aluminum are obvious, but the manufacturing cost and the maintenance cost behind have gone up, and it may not be a good thing for us consumers. Of course, here we may prefer to believe that Mercedes-Benz is simply reducing configuration and reducing costs, but who knows the truth? Ask the bearded old German man to find the answer.

Steel is good, and the strength of steel is much higher than that of aluminum. However, it is too heavy, resulting in high power attenuation and high fuel consumption of the car, so it is replaced by aluminum, but an important part of the car is alloy steel.

It is indeed better, because this material is very good, and the safety performance is very high.

The all-aluminum body is not better than the rigid body, the cost of the all-aluminum body is relatively expensive, the maintenance cost is high, and the hardness of the rigid body is far greater than the hardness of the all-aluminum body, which is safer.

Nowadays, many people are looking at the weight of the car when they buy a car, and they think that the heavier it is, the safer it is, in fact, this is very wrong, and I will tell you today.

Aluminum alloy body and steel body personally think that aluminum is better, for the following reasons:

1. If the aluminum body is reasonably designed and technologically advanced, the strength is also very high, just like the aluminum alloy body of an aircraft.

2. The weight of the steel body is large, and the usual concept will be stronger, but if there is a major accident, the safety is the same, and the same speed of the car accident The steel body will have a large kinetic energy due to the large weight, and the impact force will increase accordingly.

3. The aluminum alloy body is light in weight, and the impact force of a car accident at the same speed will be correspondingly small, and the use of aluminum alloy body can also reduce a certain amount of fuel consumption.

Industry experts said that steel and aluminum bodies have their own advantages and disadvantages, and cannot be generalized. According to the material engineer of the Automotive Engineering Research Institute, the advantages of the steel body are mainly due to the high technical maturity and relatively low cost, but there is no significant advantage in weight. The advantage of aluminum alloy body is mainly lightweight, which can leave more weight space for high-end cars to increase configuration, such as improving power.

The high cost is one of the reasons for the slow adoption of aluminum bodies to low-end cars. "For traditional car factories that mainly focus on steel body technology, aluminum body involves certain process transformation, such as uncoiling blanking, welding, painting, etc. He said that at present, the aluminum used in the body is drawn and baked and hardened, and the yield strength can reach 220 260MPa, and the strength can only reach the strength level of general high-strength steel, so it needs to be made up by the cross-section structure design and connection process, which poses a challenge to the traditional steel body design engineers, and the cost of aluminum is more expensive.

Advantages of aluminum profile itself 1: the density of aluminum profile is very small, so the weight will be much lighter than other materials, and there will be a protective film on the surface of aluminum to prevent oxidation. Aluminum profiles are non-toxic and tasteless, so the packaging of some foods will also be packaged with aluminum.

2: The aluminum profile has a high gloss, and its appearance is very beautiful, with good moldable properties, its own material factors also make itself have high fire and explosion-proof performance, because aluminum is not easy to be oxidized, so his service life is very long.

Advantages of aluminum alloy: 1. Light weight and softness. The density of aluminum is 2171g cm3, which is about one-third of the density of steel; Young's modulus is also about one-third that of steel.

2. Good strength. The tensile strength of pure aluminum is one-fifth that of mild steel. However, after heat treatment and alloying strengthening, its strength will be greatly increased.

3. Good corrosion resistance. One of the characteristics of aluminum alloy is that when it comes into contact with air, a dense oxide film will be formed on the surface, which can prevent corrosion, so it has good corrosion resistance. If the "alumina film treatment method" is applied to it, it can completely prevent corrosion.

4. Good processing performance. The extrusion performance of profiles for railway vehicles is good, and the secondary machining and bending processing are also easier. 5. Easy to regenerate.

Aluminum has a low melting point (660) and is easy to regenerate. It is also pollution-free when disposed of, which is environmentally friendly and in line with the sustainable development strategy.

To sum up, aluminum alloy is better.

It must be made of aluminum material, and the safety of the vehicle is higher than that of steel when the vehicle collides, and the disadvantage is that once the damage can only be replaced and not repaired by sheet metal, the maintenance cost is much higher.

Steel.

At present, there is no all-steel body or all-aluminum body of cars on the market (some high-end luxury brands will have a body with aluminum materials accounting for 95%), and the body of a car is constructed by two metal materials, steel and aluminum (for ordinary family cars, the proportion of steel materials accounts for the majority).

The steel body is actually a body made of steel. The biggest advantages of steel body parts are: low production costs, mature and reliable production technology.

And steel body parts also have a significant disadvantage, which is their high weight. Compared to the same volume of aluminum, steel weighs more than twice as much.

Car maintenance precautions.

In routine maintenance, the staff of the 4S shop will help the owner check some parts of the chassis, such as brake discs, brake pads, brake lines, steering rod ball joints, shock absorbers, etc., which must be done by professionals, but the owner should also pay attention to whether there is a strange sound when the car is driven during daily driving.

During the driving of the vehicle, due to the bumps and vibrations, many parts will come loose over time. In the process of driving, a car owner heard the sound of "da-la-la-la", stopped the car to check, and found that the guard plate of the car chassis was drooping down, and quickly drove the car to the maintenance point to fasten.

Steel is good, and the strength of steel is much higher than that of aluminum. However, it is too heavy, resulting in high power attenuation and high fuel consumption of the car, so it is replaced by aluminum, but an important part of the car is still alloy steel, such as the AB pillar inside the door.

The steel is good, but the disadvantage is too heavy and not lightweight, resulting in high fuel consumption due to the power attenuation of the car. It is not conducive to the development trend to be replaced by aluminum, but the important part of the car is still made of alloy steel, such as the AB pillar of the car and the inside of the door.

Silvery-white light metal. Malleable. Products are often made in sticks, sheets, foils, powders, bands, and filaments. In humid air, it can form an oxide film to prevent metal corrosion.

Aluminum powder and foil burn violently when heated in the air and emit a dazzling white flame. Soluble in dilute sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide and potassium hydroxide solutions, insoluble in water. Relative density. Melting point 660 . Boiling point 2327.

The content of aluminum in the earth's crust is the third most abundant metal element in the earth's crust after oxygen and silicon. The development of the three important industries of aviation, construction and automobile requires the unique properties of aluminum and its alloys, which greatly facilitates the production and application of this new metal aluminum. It is extremely versatile.

Aluminum kitchenware does not have to worry about ingestion, because alumina is the reason why metal aluminum is not easy to corrode in the air. Pure metallic aluminium reacts easily with oxygen in the air, creating a thin film of alumina that coats the surface of the aluminium exposed to air. This alumina film prevents the aluminium from being further oxidized.

The thickness and properties of this oxide film can be enhanced by a process called anodic treatment (anodic corrosion). And aluminum has good thermal conductivity and is more energy-saving.

All-steel is more in favor of the use of outer materials, and the use of inner liners is not recommended, because the content of trace elements such as iron, chromium, and manganese in steel products is higher than that of other pot cooking. The content of these trace elements in ordinary food is very small, and if the human body lacks one or more of them, it will cause harm to health. Therefore, the rational use of steel meals is beneficial to human health.

However, many metal elements such as chromium, molybdenum, manganese and their compounds can cause damage to human health to varying degrees and properties if they are ingested in excess. When users lack the knowledge of using steel tableware, their trace elements will slowly accumulate in the human body, and when they accumulate to a certain extent, they will cause adverse health effects.

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