The road of dream building
Release time:
2023-06-27 15:03
With the continuous improvement of people's living standards, the demand for cars is becoming more and more obvious. Therefore, the penetration rate of automobiles is high.The comfort, lightweight and low cost of automobiles have become the main goals of the development of the automobile industry today. The use of engineering plastics to replace metals in automobile manufacturing is an important means to achieve the above goals, because compared with metals, engineering plastics have the advantages of light weight, corrosion resistance, heat insulation, flexible design and easy processing.More and more metal parts in the automobile manufacturing industry are replaced by engineering plastics, and the use of engineering plastics in automobiles has become one of the indicators to measure the development level of the automobile industry.
characteristics of engineering plastics:
The main features of plastics include exterior parts, force-bearing parts and moving parts.After decades of development, its unique advantages have gradually been recognized by the mass-produced automotive industry and applied to automotive interior parts.
1. Light weight
Engineering plastics used in automotive parts usually require a density0.9~2.3g/cm3, about 1/2 of aluminum and 1/6 of steel. Therefore, this is required to reduce the overall weight of the mechanical equipment has a particularly important significance. For example, the engine supercharger impeller made of carbon fiber reinforced resin by BMW in Germany is 40% lighter than aluminum alloy, which reduces the moment of inertia, which is extremely beneficial to improve engine characteristics and acceleration sensitivity.
2. Wear and corrosion resistance
In the actual development process, the mechanical loss coefficient caused by most engineering plastics (Tag) is about 0.1, the friction coefficient is relatively low, and it can be used as a material for anti-friction parts. For example, the half-shaft gear gasket of a heavy-duty truck uses plastic sheets to travel 110,000km and wear is 0.03mm, while using copper plates to travel 30,000km and wear is 0.11mm. The glass fiber reinforced composite clutch plate is 10% lighter than the asbestos plate, and the service life can be doubled without pollution. At present, the current engineering plastics are a large number of such parts in the development of a corner. Engineering plastics also have good chemical resistance, such as polytetrafluoroethylene (PTFE), in the gold can also be dissolved in the "aqua regia" (concentrated nitric acid hydrochloric acid preparation) boiled, also not affected. This property can be used to make corrosion-resistant parts.
3. High strength
The main performance of the parts made of plastics used in auto parts depends on the composition material and structure of the parts, the fiber orientation and the combination with the base material. Through composite synthesis, structural materials with different high specific strengths can be combined. This greatly changes the mechanical properties of the material, such as glass fiberStrong plastic (GFRP) unidirectional strength values comparable to high alloy spring steel. At the same time, the thermal expansion coefficient is very small, only 1/2 of steel and 1/3 of aluminum.
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