The hottest carbon fiber makes the automobile ligh

2022-08-05
  • Detail

Carbon fiber makes the automobile lightweight, energy saving, emission reduction and noise reduction, with strong safety

I. where does carbon fiber come from

in history, heavyweights have always had stories of "being tall", and carbon fiber is no exception, that is, the well-known story of Edison inventing the electric light bulb. In 1861, Edison successfully made carbon filament as filament material to emit light for 45 hours, making people enter the electric lamp era. Carbon filament also entered the historical stage for the first time

however, as the carbon wire in the bulb is replaced by tungsten wire, the carbon wire has been left in the corner of history for nearly a century. It was not until the 1950s that carbon filaments came to the scene again. The U.S. Air Force learned that the melting point of carbon was as high as 3600 degrees and that carbon filaments had high temperature resistance and high strength. It invited carbon filaments into the laboratory again and invented the name of "hanging the sky": carbon fiber. Subsequently, through continuous research and development and improvement, the unique advantages of carbon fiber "soft outside and hard inside" were fully demonstrated

carbon fiber is lighter than aluminum, but its strength is higher than that of steel, and it has the characteristics of corrosion resistance and high modulus. Therefore, carbon fiber was first used in military aircraft, spacecraft and other fields, such as the U.S. F-35 fighter; Later, it was more and more widely used in many fields, such as Boeing 787 and other civil aircraft, wind turbine blades, luxury yachts, medical and health care, leisure sports goods and so on

II. Application status of carbon fiber in the automotive field

with the progress of science and technology, some new technologies and materials have been gradually applied to the automotive field, and have had a far-reaching impact on the development of the automotive industry. Among them, the application of carbon fiber materials in the automotive industry is the most typical

1. Outstanding advantages brought by carbon fiber to automobile manufacturing

lightweight

after carbon fiber is applied to automobile, the most obvious benefit to automobile manufacturing is automobile lightweight, and the most direct impact is the improvement of energy saving, acceleration and braking performance. Generally speaking, the vehicle weight is reduced by 10%, the fuel consumption is reduced by 6% ~ 8%, the emission is reduced by 5 ~ 6%, the km/h acceleration is increased, and the braking distance is shortened by 2 ~ 7m

for example, in the body frame of the new BMW 7 series, carbon fiber reinforced composites are used to strengthen the roof beam structure, as well as B and C columns, bottom side wall, central channel and rear support. Compared with the previous generation models, the new BMW 7 series has a maximum weight reduction of 130kg, becoming the leader of intelligent lightweight structure in the large luxury automobile market

for another example, bmwi3 uses a large amount of carbon fiber materials to manufacture car bodies. The listed models are 300kg less than the original design. The I3 model has been recognized by the market, which also verifies the feasibility and economy of the mass production technology of low-cost rapid prototyping carbon fiber car bodies

safety

the lightweight body can move the center of gravity of the whole vehicle down, improve the handling stability of the vehicle, and make the operation of the vehicle more safe and stable. Carbon fiber composite has excellent energy absorption rate, and its collision energy absorption capacity is six to seven times that of steel and three to four times that of aluminum, which further ensures the safety of automobiles. The fixture on the testing machine should be able to immediately align into a line

comfort

the carbon fiber composite has higher vibration damping. It takes 9 seconds for the light alloy to stop vibration, and 2 seconds for the carbon fiber composite. Therefore, the application of carbon fiber in the automobile contributes greatly to the improvement of NVH (noise, vibration and acoustic vibration roughness) of the whole vehicle, and will greatly enhance the comfort of the automobile

reliability

carbon fiber composites have higher fatigue strength. The fatigue strength of steel and aluminum is% of the tensile strength, while that of carbon fiber composites can reach%. Therefore, the application of carbon fiber composites in automobiles can greatly improve the fatigue reliability of materials

improve the level of body development

because the designability of carbon fiber composite is stronger than that of metal, it is easier to platform, modularize and integrate the body development. In this way, the hybrid body structure of carbon fiber body and metal platform can be modular and integrated for the traditional car body structure, greatly reducing the types of parts, tooling investment and development cycle

especially for new energy automobile enterprises, the application of carbon fiber body can not only save the investment in stamping and welding production lines, molds and fixtures, reduce the proportion of fixed assets, optimize the asset allocation structure of enterprises, but also have more influence on the market publicity of enterprises

taking a comprehensive view of the application layout of carbon fiber composites in the product line of high-end brands such as Mercedes Benz, BMW and Audi, we can predict that the application of carbon fiber composites in automobiles will inevitably become the development direction

2. Major challenges facing China's carbon fiber industry

although carbon fiber materials have many advantages, its core technology is firmly controlled in the hands of a few developed countries. On the one hand, developed countries such as the United States, Japan, South Korea and Germany keep the technology strictly confidential; On the other hand, the foreign industry-leading enterprises of carbon fiber D. adopt the dynamic exchange method for each length, power unit and display digit, and begin to enter the Chinese market, which greatly increases the pressure on Chinese local carbon fiber enterprises

the research on carbon fiber in China began in the 1960s and began to study high-strength carbon fiber in the 1980s. The progress has been slow for many years. Since entering the 21st century, it has developed rapidly. Especially with the rise of China's automobile industry, the research, development and application of carbon fiber materials have made great progress and grown rapidly

at the same time, carbon fiber also faces many challenges in the automotive industry. First, the process is complex, mainly using traditional processes such as hot pressing cans and vacuum induction. With the increasing number of automobiles in China, this process has low production efficiency, long production cycle and high product cost, and can not meet the requirements of large-scale automobile production. In places where the testing standards of each machine are different, everyone should pay attention to the requirements of modular production; Second, the cost is relatively high. The price of carbon fiber materials is several times that of metal materials, which not only restricts its application and development in the automotive field, but also virtually keeps low-end or independent automobile brands away; Third, there is a lack of design talents, and because the technology was rarely applied in China before, there is a very scarce talent who has been engaged in the design of carbon fiber mass-produced parts

in particular, it should be pointed out that carbon fiber is a closely connected whole from basic research and development, product design, production process selection to the production of automobile parts, and every link is linked. Therefore, this has established a very high technical barrier for the development of carbon fiber in the automotive industry, requiring carbon fiber manufacturing enterprises to have a strong comprehensive strength

3. In the field of carbon fiber, Chinese enterprises have world-class competitiveness.

at present, there are not many Chinese enterprises that can provide one-stop services for the automotive industry in the research and development, design, processing and manufacturing of carbon fiber materials. Kangde composite materials Co., Ltd. (hereinafter referred to as "Kangde composite materials", an enterprise affiliated to Kangde Investment Group Co., Ltd.) is one of the leading enterprises

over the years, Kangde group has been making unremitting efforts to improve its R & D and production level in order to fill the gap in the design, manufacturing and processing of carbon fiber materials in China. Up to now, Kangde group has completed the layout of the industrial ecological chain of carbon fiber components for new energy vehicles. The industrial ecological chain includes: the carbon fiber industry of zhonganxin, the industrial version 4.0 intelligent carbon fiber car body and component manufacturing plant of Kangde composite materials, the kdx European composite materials R & D Center and kdx Redding automobile lightweight design center in Munich, as well as the mass production of GFG and SGL in Germany Automatic production technical support. This complete ecological chain will provide systematic and globally competitive solutions for global vehicle enterprises, and provide all-round services from design, R & D, sample trial production, testing, small batch production to large-scale supply. In 2014, Zhongyu, chairman of Kangde group, was invited to attend Chancellor Merkel's private luncheon during his visit to Germany. In 2015, he accompanied Premier Li Keqiang to receive Chancellor Merkel's visit to China

as mentioned above, Kangde group has maintained a close strategic cooperative relationship with the German government and German enterprises. It has cooperated with the carbon fiber composite Research Institute of Munich University of technology to establish the European composite material research and development center. It has jointly established the automobile lightweight design center with the German reading company, the only company in the world other than BMW that has the design experience in mass production of carbon fiber parts. On April 6, Philip eller, President of BMW (China) Service Co., Ltd., announced that he would carry out in-depth cooperation with kangdexin in the field of window film at the foundation laying ceremony of Zhangjiagang kangdexin optical film phase II project; In addition, the company will discuss the strategic layout with Kangde composite materials in the aspect of carbon fiber to solve automobile lightweight

III. The application prospect of carbon fiber in China's automobile field is extremely broad.

as we all know, China is vigorously promoting the development of new energy vehicles, but the promotion and popularization of new energy vehicles are restricted by the problems such as imperfect charging facilities, short battery range and high price of electric vehicles

to better promote new energy vehicles in the future, in addition to accelerating the construction of supporting infrastructure such as charging piles, it has become an urgent problem for new energy vehicle manufacturers to effectively reduce the cost of new energy vehicles and improve the endurance capacity of new energy vehicles

the best way to realize the lightweight of new energy vehicles is to reasonably use carbon fiber materials. Experiments show that using carbon fiber material to replace the existing steel body can effectively reduce the weight by more than 60% and increase the driving range by more than 20%. China is vigorously promoting the development of new energy vehicles, so the application prospect of carbon fiber materials in the field of new energy vehicles is very broad

in fact, carbon fiber materials have a wide range of applications in traditional vehicles, in addition to their broad prospects in the field of new energy vehicles

first of all, the hybrid body structure of carbon fiber body and metal platform can be modular and integrated for the traditional car body structure, greatly reducing the types of parts, tooling investment and development cycle

lightweight carbon fiber body structure

secondly, China is currently implementing the third stage fuel consumption standard, which has been fully implemented (the average fuel consumption of enterprises is 6.9l/100km); The fourth phase of fuel consumption standard was introduced in 2016, and the average fuel consumption of enterprises was reduced to 5l/100km in 2020; The government will severely punish enterprises that fail to meet the standards. According to authoritative estimates, based on the annual sales and fuel consumption of Changan Ford in 2015, it will be fined 800million yuan

at present, it is difficult for Chinese automobile enterprises to upgrade their engines in a short period of time. In order to make the enterprise meet the fuel consumption standard, automobile lightweight is imperative. Compared with the complex working conditions and performance requirements of chassis parts, the application of carbon fiber body is the most effective way of body lightweight. This is because the mass of cars that use carbon fiber materials will be reduced by%, and the fuel consumption can be saved by 7% for every 10% weight reduction of the car structure. If the weight of vehicle body is reduced by 20%-30%, the annual CO2 emission of each vehicle can be reduced by 0.5T. Carbon fiber has no problem of corrosion and rust, and is more durable than ordinary metal

according to AJR consulting company of the United States, due to the wide application of carbon fiber materials, its global market sales will increase from US $16.11 billion in 2011 to US $48.7 billion in 2020, mainly in the automotive field

therefore, in the future, carbon fiber materials will be "promising" in the automotive field

in a word, vehicle lightweight has become an inevitable trend in terms of performance and environmental protection,

Copyright © 2011 JIN SHI