The plastic bumper is made of plastics, mainly polyester and polypropylene, which are made by injection molding. For example, the bumper of Peugeot 405 car is made of polyester and made by reaction injection molding. Volkswagen audi 100 Golf Shanghai Santana Tianjin xiali model car bumpers, adopted polypropylene materials made from injection molding in Abroad have a called polyethylene carbon ester plastic, seeping into alloy composition, using the method of metal injection molding processing of bumper not only has high strength, rigid, also has the advantages of can welding and coating performance is good, in the amount of cars more and more.
Bumper has safety protection decoration vehicle and improve the aerodynamic characteristics of the vehicle and other functions from the safety point of view, the car can play a buffer role in low-speed collision accident, protect the front and rear body; In the event of an accident with pedestrians, it can play a certain role in protecting pedestrians. From the appearance, it is decorative and becomes an important part to decorate the appearance of cars. At the same time, the car bumper has a certain aerodynamic effect at the same time, in order to reduce the car side collision accident on the occupant of the injury, in the car is usually installed with a door bumper, in order to enhance the door impact force of the collision this method is practical and simple, the body structure of the little change, has been widely used As early as 1993, Honda Accord at the Shenzhen International Automobile Exhibition cut a part of the door to expose the bumper to show the audience, to show its good safety performance The installation of the door bumper is a number of high-strength steel beams horizontally or diagonally placed in the door panel of each door, playing the role of the front and rear bumper, so that the whole car has bumper protection around the front and rear, forming a copper wall and iron wall, so that the car occupant has a maximum safety area Of course, the installation of such door bumpers will undoubtedly increase some costs for car manufacturers, but for car occupants, safety and security will increase a lot.
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Shanghai Electric Group made the first domestic million kilowatt generator
Recently, the first domestic million-kilowatt steam turbine generator successfully completed the type test and scientific research under various hydrogen-filled conditions on the assembly test bench of Shanghai Steam Turbine Generator Co., Ltd. of Electric Group. The design requirements were met, marking the official birth of a domestically produced million-kilowatt generator. The official birth of the domestically produced million kilowatt-class generators has emboldened the dreams of several generations of motor manufacturers in China. From the main machine of Waigaoqiao Power Plant and the first unit of Yuhuan Power Plant, the stator of the second tower of Waigao Power Plant was subcontracted, and the second generator of Yuhuan Power Plant was produced, imported, digested and absorbed. The advanced technology from abroad has fully mastered the manufacturing technology of millions of kilowatt-class generators and has the ability to produce domestically produced million kilowatt steam turbine generators.