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Promotion of new energy vehicles life, the three body material you should know

2017-7-28 14:29:04 次流覽

     In May 11, 2017, jointly organized by the Chinese Automotive Technology Research Center and Tianjin city Xiqing District People's government, data center Chinese automotive technology and Research Center hosted the 2017 Chinese vehicle material (Xiqing) International Forum held in Tianjin. The theme of this forum is "innovative material reshaping the value chain of auto industry", and nearly 1000 guests from home and abroad are involved in in-depth exchanges. In the lightweight materials forum, a number of experts have analyzed the current automotive industry lightweight materials (aluminum alloy, carbon fiber, engineering plastics) application status and future trends.

    The Ministry of industry and information technology energy saving and Comprehensive Utilization Department Director Gao Yunhu pointed out in his speech, the Ministry of energy division will further promote the green design and green design evaluation of the pilot demonstration, to create a number of strong demonstration effect of green supply chain, and gradually establish a green product design market supervision mechanism. Guan Junwen, deputy director of the National Security Supervision Commission pointed out that the national security supervision commission will be in the automotive, related parts and components, materials and other fields to fully implement the green product certification system, to provide consumers with more and better quality products.
    Aluminum alloy: the most widely used lightweight materials for automobiles
    At present, aluminum alloy material is the most widely used lightweight material in automobile manufacturing industry. In a conventional car, Jaguar Land Rover, Audi and other models have been used in all aluminum body; new energy field, Nissan used Aluminum Alloy panel, and Tesla all models from the chassis to the body is made of Aluminum Alloy.

  

  "For electric cars, one hundred kg weight loss can increase the distance of about 10%, in addition, you can reduce the cost by weight loss. Because the car body is light, you can reduce the weight of the battery. Now the battery says the cost capacity to count, one thousand watts is probably in the two thousand to three thousand dollars, through weight loss to reduce battery costs, to a certain extent, solve the new energy automobile cost problem." Aluminium Corp chief engineer Zhao Pizhi said. From a safety point of view, weight loss can shorten the braking distance, improve safety performance, and help pedestrian protection, improve safety performance.

   For the aluminum alloy market prospects, Zhao Pizhi analysis: "as early as 2012, China's entire automotive aluminum alloy materials market used ten thousand tons a year, by 2016, the number has risen to 70 thousand tons.". Until 2020 there will be 300 thousand tons of high-end covering parts of the size of the market, in addition to high-end covering parts and pieces of the structure, in addition to commercial vehicles for aluminum, which add up to in 2020 Chinese automobile aluminum market will exceed one million tons."
     In order to save energy, reduce emissions, prevent warming and improve safety performance, the automotive industry is using aluminum alloy automotive panels to achieve lightweight cars, China's car lightweight prelude has been opened.

    Carbon fiber: lighter, better, but also more expensive
    "Lightness is always a balance between weight, performance, and cost."." This is the Kang Defu material vice president He Peng on lightweight understanding. Compared with steel and aluminum alloy, the density of carbon fiber has 20% to 30% advantages, and has some typical features of nonmetal, such as corrosion resistance, besides, it has very high specific strength and specific strength.

    Cost is a big disadvantage. At present, the comprehensive cost of carbon fiber is equivalent to 2 times to 2.5 times of the comprehensive cost of aluminum. However, throughout the lightweight process, carbon fibers can serve as a good addition to the material and key materials that can be matched with aluminum or other metals at this stage. In the long run, with the expansion of the application field and industrialization, we can gradually replace more metals as a major material for automotive applications in the case of lower costs.

      He Peng said, is expected in 3 to 5 years later, through the localization of the industrial chain to reduce the cost of carbon fiber. Localization of the application, the entire industry chain in the country completed 0 to 1 of the process, after the realization of the application, driven by the decline in the overall cost. In addition, the design capacity and experience, because in the country, the entire design of carbon fiber, including carbon fiber database, body specimens are not very sound, we are still groping forward. In addition, the manufacturing process needs to be further improved, because the cost of carbon fiber manufacturing needs to be further reduced, which will make it possible to make better use of carbon fiber in the automotive field.

    "In the current based on the cost of carbon fiber on the use of three to five years to reduce the cost of 30% to 50%, compared with that aluminum can be applied to more competitiveness, better application in the car of the above structure."

     Engineering Plastics: low price, high plasticity
      The concept of plastic steel has been widely circulated, because of its low price, high plasticity, high performance plastics and plastic composite materials are more and more large-scale application in the car, the car on the German engineering plastics consumption most, accounted for more than 15% of the average vehicle materials.

     The proportion of general plastics in 0.9 ~ 1.6, glass fiber reinforced composite material will not exceed 2, while A3 steel is 7.6, aluminum is 2.7. The use of plastics can reduce the weight of parts by about 40%, while the cost can be greatly reduced.

     At this stage, the common automotive engineering plastics are polyamide, polycarbonate, POM, modified polyphenylene oxide and ABS. Polyamide material is mainly used in power, chassis components and parts, accounting for about 20% of the whole plastic; POM, polycarbonate, modified polyphenylene ether material is mainly used in electronic and electrical appliances parts and parts, accounting for about 15% of the whole plastic; ABS engineering plastics is mainly used for automotive interior trim parts etc..

     "In the field of new energy vehicles, engineering plastics still have a wide range of applications, such as battery modules, housings, connectors and so on. The battery case requires the strength of the material, while the connector requires insulation and sealing performance. In achieving lightweight, the engineered plastic perfectly meets the requirements." DuPont China Asia Pacific Technology Manager Wang Xingwang said.

     According to tests, in 2020 the average amount of plastic vehicles will probably reach more than 500kg/ vehicles, accounting for more than 1/3 of the vehicle materials. With the widespread use of new energy vehicles, the cost of aluminum alloy and carbon fiber is too high, and imports mainly. In the future, the roof, door, seat parts, wheel hub, and the structure of the automobile periphery may be switched to engineering plastics.

      Engineering plastics market demand will inevitably lead to plastic modification, plastic preparation, manufacturing, mold and other related industries. At present, the study in this area is one of the hotspot of scientific research, industry, at the same time, some problems should pay attention to the relevant personnel, such as engineering materials, micro structure and anisotropy may bring security, it will also lead to other new design challenges.

      

     Light is actually a combination of a process of multiple material discipline optimization, in order to meet the performance, to achieve weight loss goals of weight in a range of cost, is a balanced optimization process. "The most suitable material used in the most correct place", so that the car products in order to ensure safety, comfort based on the ultimate lightweight.  


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