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Application trend of composites under the slogan of lightweight
Writer:admin    Released:2018-08-31 17:08:31    Type:【L】【M】【S
With the continuous innovation of materials and the concept of car lightweight, the current trend of energy conservation, emission reduction and innovation is becoming more and more intense;Today's automobiles already contain a large number of plastic parts, such as bumper, wheel cover, plate plate, dashboard, door plate, knob, and even engine cover and air intake system.Plastic, molding machine in the lightweight process of the balanceThe role of plastics in lightweight is not only to reduce the weight of the car, but also to improve the car in many aspects such as cost reduction and safety performance.Generally, the proportion of plastics is between 0.9 and 1.6, and the proportion of glass fiber reinforced composites is no more than 2.0, while A3 steel is 7.6, brass is 8.4 and aluminum is 2.7.This makes plastics the preferred material for lightweight cars.Plastics can reduce the weight of parts by about 40%, and their cost can be greatly reduced.In terms of safety performance, plastic bumpers can protect pedestrians more easily than metal bumpers to some extent due to their better elasticity and impact absorbing ability.And according to dupont, plastics are equally effective at reducing friction.In the future, the application of plastics in lightweight ratio will further enhance, is expected to reach 50% by the year 2020 in the use of plastic, now, Germany, the United States, Japan and other countries of auto plastic volume of 10% - 10%, according to the weight of a small car is about 1.5 tons, the annual average global production 50 million new vehicles as the standard, to 2020, the global demand for plastic will be very great.On October 22, engel's MichaelFischen, together with porsche senior expert and chartered engineer nohner, explained the method of lightweight injection molding, including the application of materials such as foaming of thermoplastic materials and wood fiber in lightweight automobile.Determining the use of plastic parts is an important means to achieve light-weighting. The application of plastics in the light weighting of cars has an important significance, which can not only reduce energy consumption, but also reduce CO2 emissions, which is conducive to energy saving and pollution reduction.China's light-weight policy promotes the development of plastics enterprisesOn October 28 this year, the book "China's vehicle lightweight development -- strategy and path", with the theme of "promoting the development of vehicle lightweight technology", proposed the lightweight strategy and lightweight technology path for the first time in China.The newly revised "passenger vehicle fuel consumption limit value", the national mandatory standard, will be implemented from January 1, 2016, and the fuel consumption will be set to reach the standard every year until 2020, the average fuel consumption of passenger vehicles will be reduced to 5.0 liters /100 kilometers.The increasingly stringent fuel economy regulations have prompted all automobile manufacturers to spare no effort to develop automotive lightweight technology.Plastic enterprises and plastic machine enterprises aim at light weight togetherForeign auto brands are now using high-performance engineering plastics and plastic composites on a large scale.In the future, the doors, roof, seat parts, wheel hubs, and surrounding structural parts of cars could be converted to engineering plastics.Compared with steel, the fiber reinforced composite plastics can reduce weight by 35%.If carbon fiber reinforced composites are used, the weight can be reduced by more than 60%.Honeycomb sandwich structure has been widely used in automobile interior, including trunk floor, roof lining and rear window panel.The new mercedes-benz smartfortwo USES basf ElastoflexE styrofoam in the honeycomb structure canopy. The roof module is composed of honeycomb sandwich and glass fiber liner, which is about 30% less than the ordinary canopy, but still maintains good strength and bending stiffness.And Tepexdynalite, a polypropylene based continuous fiber reinforced composite introduced by lanxess subsidiary, also has significant opportunities in the production of lightweight vehicles, especially for large components with high strength demand, such as the trunk floor, vehicle extender housing and seat components.The development of lightweight plastics needs to be accompanied by the innovation process of plastic machine. The long glass fiber reinforced composites, carbon fiber reinforced composites, and modified low-density, micro-foaming and thin-walled plastics materials are the hot spots in the research of vehicle materials at present.The development and application of these materials cannot be separated from the support of innovative technology.Long fiber injection molding is an innovative process of lightweight structural components.The long fiber direct injection molding developed by Arbug (aberg) can feed the fiber directly into the melted plastic through the feeding device driven by servo motor, which can cut the continuous fiber into the length of 15-50mm. The two-stage screw can ensure that the melted plastic particles are fed into the fiber at the same time, ensuring the uniform mixing and truly achieving the purpose of increasing strength.Take the long fiber direct injection molding of automobile air bag case as an example, use 16mm glass fiber direct injection molding, 50% of glass fiber length can be greater than 2mm, greatly superior to the long fiber granule injection molding.Engels mold manufacturing (China) co., ltd. has exhibited its new FLEXflow servo drive valve gate system at the CHINAPLAS2015 exhibition, which is especially suitable for injection molding applications of large automobile plastic parts, high-quality optical parts, high-performance engineering materials and narrow process Windows.In terms of cost saving, the clamping force can be reduced by about 20% and the weight of plastic parts can be reduced by up to 5%.The application of MuCell micro-foam injection molding technology in automobile manufacturing is becoming more and more popular.According to media reports, land rover plans to adopt MuCell technology on all models by 2017.Micropore foaming refers to the closed micropore with the size of ten to dozens of microns in the middle layer of the product, which is made of thermoplastic material as the matrix through special processing technology.MuCell technology is particularly advantageous in weight reduction, which can reduce the weight by up to 10% on the premise of basically ensuring the structural strength of the parts.Reduce cycle time by 50% and average cost by 16% to 20%.Back in 2000, Trexel was the first company to use the technology for commercial applications, based on its partnership with MIT.Many of the world's leading equipment and materials manufacturers, including Arbug, Demag, Engel, Husky, and Dupont, have purchased patents for the technology.In the future, MuCell will be a technology that the industry will compete to achieve the lightweight goal.The introduction and practice of automotive lightweight slogan greatly increased the market demand for plastic products, enabling the market of plastic materials including polypropylene, polyurethane, polyvinyl chloride, thermosetting composite, ABS, nylon and polyethylene to be rapidly expanded.In the past two years, polypropylene, the largest variety of vehicle plastics, has been growing at a faster rate of 2.2 to 2.8 percent per year.The average amount of plastic used by cars in developed countries is expected to reach more than 500kg/vehicle by 2020.How to seize this opportunity nirvana rebirth, seeking new economic growth point to continue the industry brilliant worth all practitioners.
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