The hottest BMW takes the lead in launching carbon

2022-07-30
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BMW took the lead in launching carbon fiber pure electric vehicles

the pure electric vehicles launched by BMW took the lead in adopting carbon fiber bodywork in mass production vehicles, while Japanese car companies still show a negative attitude towards the adoption of this new material, and the too close trading relationship with steel companies may hinder the transformation of materials, leaving Japanese car companies in a backward position in lightweight competition

caikejian of Ningbo Institute of engineering, etc. used polystyrene foam (EPS) in embankment filling works, which can significantly reduce the foundation settlement caused by embankment and the lateral earth pressure on the back of abutment, and improve the foundation stability.

carbon fiber has always been known as the trump card of automobile lightweight. The three Japanese chemical enterprises, Toray, Teijin and Mitsubishi Liyang, account for more than half of the global carbon fiber share, However, this material has not been officially adopted in Japanese cars. In April, BMW began to sell ev (pure electric vehicle) "I3" with a large number of cutting-edge materials in Japan, with the slogan of "carbon fiber electric". Prepare for installation; The car uses carbon fiber to replace the most commonly used steel in the car body materials in the past. Why can BMW take the lead

carbon fiber has achieved sufficient strength and durability in the whole experimental process with only one fourth of the weight of steel. Lightweight is the most important issue for EV and other environment-friendly vehicles whose driving distance is too short for one charge. The advantage of using carbon fiber is very obvious

however, the use of carbon fiber will greatly increase the cost, which is the biggest obstacle to the popularization of carbon fiber in automotive materials. The price of I3 in Japan starts from 4.99 million yen (about 304000 yuan), which is not a high price in BMW's product line. The success of this car in reducing the cost increase and realizing the full adoption of carbon fiber relies on the cooperative relationship between BMW and Japanese chemical enterprises

the joint venture between SGL, a large German material manufacturer, and BMW uses the carbon fiber raw yarn developed by Mitsubishi liyang to process it into CFRP (carbon fiber reinforced resin matrix composite) using resin and other materials, and provides it to BMW ev

cfrp takes a lot of labor and cost to form, so it was only used in sports cars with a unit price of tens of millions of yen. This time, with the cooperation of the three companies, the molding time was shortened to less than 10 minutes, reducing the cost to a practical level

joergpohlman, managing director of the joint venture, said: "the molding technology has been innovated by improving the stacking mode of carbon fibers."

in addition, the I3 chassis has also made great efforts. Previous EVs basically used the chassis of existing gasoline engine vehicles, but changed the drive system to the electrical system. BMW I3 not only makes the extensive use of carbon fiber a reality, but also develops a special chassis suitable for carbon fiber body

as long as the I3 is compared with the representative environmental protection vehicles in Japan, it can be clearly seen that the lightweight of I3 has achieved considerable success. Compared with 1260kg of I3, Nissan's EV "leaf" is 1440kg, and Toyota's plug-in hybrid vehicle "Prius PHV" is 1420kg. Among the three cars, the I3 motor has the highest output power, because it is equipped with a large number of batteries that will increase the weight. However, the I3 weighs far less than the other two models

following I3, BMW's plug-in hybrid vehicle "I8" to be launched in 2014 will also use CFRP body, and will continue to increase the use of CERP models in the future

Yoshihiro Ono, executive director of Mitsubishi Liyang, said: "the total amount of carbon fiber supplied to BMW is expected to reach 8% of the global market." BMW has become a presence that can affect the development of the world carbon fiber market

BMW is not the only automobile enterprise actively adopting carbon fiber. Daimler has also cooperated with Toray, General Motors (GM) and teiren. Now, these companies are developing technologies to expand the use of carbon fiber in car bodies

on the other hand, Japanese car companies are relatively passive in adopting carbon fiber. This can be seen from the fact that the partners of the world's top three carbon fiber enterprises in Japan are all European and American automobile enterprises

according to the company's personnel, a person in the automotive industry pointed out that this is because the Japanese auto companies have a close relationship with steel companies. In developed countries, few national iron and steel enterprises have such a lofty position in the industrial field as Japan. Represented by the relationship between Toyota and Nippon Steel and Sumikin, Japanese automobile enterprises and Japanese steel enterprises support each other like "two people and three feet", with a history of leading the world in developing lighter and stronger automobile steel

by using the most advanced steel materials, Japanese cars have established a brand image of light weight, fuel economy, safety and durability

due to such successful experience, the development and production personnel of Japanese car enterprises always prefer to use steel materials. Moreover, if materials other than steel are selected, the automobile development methods and production equipment such as stamping based on the use of steel must also be replaced. Another thing that cannot be forgotten is that the steel enterprises that take the automobile oriented business as a source of income have also been "preventing" the replacement of automobiles with other materials

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