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SMC composite material is the abbreviation of Sheet molding compound, namely sheet molding compound. The main raw material consists of GF (special yarn), UP (unsaturated resin), low shrinkage additives, MD (filler) and various additives. At present, SMC materials are widely used in transportation vehicles, construction, electronics, electrical appliances and other industries. It is understood that in order to promote the application of composite materials such as SMC in automobiles, the "Automobile Composite Materials Alliance (ACA)" has been set up abroad to provide composite materials products for the automotive industry.
In China, in the mid-1960s, the hand lay-up process was used in automobile manufacturing to trial manufacture composite materials to produce automobile parts. However, the work efficiency and product performance were very limited. The development of SMC technology began with the localization of the relevant model components introduced in the mid-1980s, such as the IVECO S-series commercial vehicles introduced by NAC in 1985, SMC bumpers , and hand lay-up/RTM top panels. Original Heavy Duty Truck Group, the introduction of Steyr heavy truck series, SMC mask, FRP sun shield and shroud, etc., and SMC materials began in heavy trucks aspects of the application in the 1990s, the current application SMC technology in heavy truck front cover aspects of the new One of the research areas.
SMC material meets the trend of heavy-duty lightweight design
With the increase in heavy-duty truck operating costs, lightweight design of vehicles has become one of the targets for domestic heavy-duty truck design and manufacturing. SMC composite materials meet the requirements of lightweight design. The performance of SMC materials is close to that of commonly used steel materials for automotive bodies, but its The density is much lower than that of steel. Because of its excellent performance, SMC can be used not only as a heavy-duty mask material but also as a body panel for heavy-duty trucks. It is reported that in vehicles using SMC materials, the body panel accounts for 70% of the SMC dosage. . According to Jianghuai engineering personnel, “The material of the front cover of the JAC heavy truck has been changed to SMC material, the cost will be reduced by about 200 yuan, and the weight will be reduced by 10kg. For the lightweight design of the heavy truck, it provides good materials and can be expected. In the next few years, the usage of SMC in JAC heavy trucks will continue to increase."
China's auto industry is becoming a pillar industry of the national economy, and it maintains a high-speed development trend. With the increase in investment in infrastructure construction, heavy trucks will continue to maintain rapid growth and become the highlights and growth points of the Chinese auto industry. The characteristics of heavy-duty truck body parts are large area and complex structure. The models are updated quickly. The annual output of most models in China is less than 30,000 units, and the metal manufacturing process and plastics process have the risks of high investment in molds and tooling. Composite SMC material manufacturing processes can achieve higher overall cost-effectiveness.
Application of SMC composites in the automotive sector:
Developed countries such as Europe, the United States, and Japan have adopted SMC composite materials in large quantities in automobile manufacturing, involving cars, passenger cars, sports cars, and agricultural vehicles. The main SMC components include the following types:
1, suspension parts, front and rear bumpers , dashboards , masks and so on.
2, under the hood parts such as air conditioning housing, air guide cover, the intake pipe cover, fan shroud, face mask, the heater cover, the tank member, the brake system components, and the battery bracket, the engine soundproof panels.