机械工程专业英语论文doc.docx

1、机械工程专业英语论文doc 专业英语论文考核专业年级 机械电子141 姓 名 韦 继 虎 学 号 1611140109 指导教师 董 文 彬 完成时间 2017年6月10日 窗体顶端Application and Development of Lightweight Material for Automobile窗体底端Abstract Car lightweight is an important means to achieve energy-saving emission reduction and methods, in improving the fuel economy and e

2、nvironmental protection has an important role. At present, the lightweight new material is the main way of the current body weight reduction, through the multi-material structure optimization, both to improve vehicle performance, but also significantly reduce the quality. This chapter discusses the

3、performance and application of several lightweight materials, describes the development of lightweight materials in the automotive industry and the application of the trendKey words: automotive ；lightweight ；lightweight materialsPreface窗体顶端窗体顶端 The study of lightweight car is a mainstream of modern

4、car design and manufacturing. Car lightweight, is to ensure the strength and safety of the car under the premise of the car as much as possible to reduce the quality of the preparation, thereby enhancing the vehicles power, reduce fuel consumption and reduce exhaust pollution. Data show that if the

5、car to reduce the quality of 10%, fuel efficiency can be increased by 6% to 8%, fuel consumption can be reduced by 6% to 10%. Fuel consumption decline, emissions also decreased, while resource utilization increased, extended life of the car, the use of performance has improved significantly. Car bod

6、y quality accounts for about 50% of the quality of the vehicle, it is clear that the lightweight body for the vehicle lightweight play a pivotal role 1. At present, the car body weight reduction has two main research directions: First, the use of lightweight materials; Second, optimize the structure

7、. Structural optimization potential space has been very small, the gradual use of lightweight new materials is the current body of one of the main means of lightweight.1 New high strength steelIn recent years, with the progress of metallurgical technology, on the basis of high-strength steel, with u

8、ltra-low carbon as the basic characteristics, and gradually formed with deep drawing, high strength, baking hardening performance of new high-strength steel. At present, the use of high-strength automotive body is mainly sheet metal and pipe. Mainly: (1) BH steel (bake hardening steel). BH steel pla

9、te yield strength in the baking paint increased, without loss of formability under the premise of improving the anti-depression, can reduce the steel plate, mainly for high strength and difficult to form parts, such as roof, Doors, luggage and other components, the main use of tensile strength of 34

10、0 390MPa BH steel plate. (2) RIP steel (phase change induced plastic steel). Mainly used for the collision must absorb more energy when the high-strength structural parts, such as body frame. (3) MS steel (martensitic phase steel). Used to hit the high impact parts, that is, in a very short collisio

11、n deformation stroke to absorb a lot of energy, such as side crash protection. (4) boron steel. Used to require high strength and high degree of molding of parts, can minimize the quality. Such as A, B column reinforcement, etc. 2.Practice has proved that when the thickness of the steel were reduced

12、 0.05,0.10,0.15 mm, the body weight loss were 6%, 12%, 18%. In terms of development trends, the use of new high-strength steel plate in the body is constantly thinning, while the body strength has increased, while increasing the safety of the car, reducing noise and vibration, improve fuel efficienc

13、y and reduce the overall quality of the car. The cost did not increase, while the acceleration, driving performance has improved. Whether from the cost point of view, or from the performance point of view, the new high-strength steel plate is to meet the lightweight body to improve the safety of the

14、 collision of the best materials. The proportion of new high-strength steel plates used in various automobile factories is increasing. Japans Mitsubishi Pajero (SPORT) for the companys latest SUV car designed a new body structure, body 70% of the components made of high-strength steel plate, the veh

15、icles torsional stiffness even higher than the Grand Cherokee 45% Body carrying capacity of up to 2t or more. Fords Windstar body frame 60% is high strength steel. Toyotas new Vitz body structure in high-strength steel accounted for 48%, than the companys Starlet car to reduce the quality of 17kg.Ho

16、wever, the high strength of the steel sheet is liable to cause a decrease in plasticity, a poor formability, and an increase in yield strength, which causes surface distortion and springback, and increases the shapes instability. Thus, high strength steel sheets are a difficult to form material. Thermoforming technology is a new type of high-strength stamping parts for the advanced manufacturing technology, can b