The Research And Develop Of High Strength Automobile Suspension Spring Wire Rod

Suspension spring in the running process of the automobile, under high-frequency reciprocating compression movement, a buffer and damping function, its quality on vehicle stability, security plays a crucial role. In recent years, China’s rapid development of automotive industry, has been more than the United States to become the world’s largest automobile producing countries. Automobile production increased and the performance of spring wire rod proposed the stern challenge, also with the continuous improvement of train speed, strength and life of spring steel posed a severe test. At present, the development trend of spring wire rod is to the economy and the development of high-performance direction. On the one hand is to make full use of the existing spring steel potential, such as improving the production process, using new technology, make some adjustment on the composition, improve the performance further, expand the scope of application; on the other hand is the research and development of new steel spring wire rod, further improve the anti fatigue and anti sagging.With the development of high strength automobile suspension spring wire rod for the goal of this paper, research and development of high strength automobile suspension spring wire rod (55SiCr) new technology, improve enterprise technology innovation ability, improve our suspension spring wire rod product technology level and market competitiveness, and create greater economic benefits for China’s auto industry. The specific content of research and development:(1) developed the stress level is 1100MPa, product quality reach the spring steel wire rod 55SiCr suspension of similar products abroad, and to meet the requirements of the market use.(2) 55SiCr process test using a test set, determine the deformation parameters and cooling process parameters to implement high strength automobile suspension spring wire rod required heat, study the influence on the microstructures and properties of various process parameters; setting high strength automobile suspension spring wire rod production when the heating temperature, time in furnace, roughing rolling temperature, temperature, thickness of the initial rolling temperature, final rolling temperature, rolling start cooling temperature, cooling method, cooling rate, final cooling temperature and other key parameters.(3) combined with production line equipment parameters of spring steel, the suspension spring steel wire rod process mode and control strategy and subsequent heat treatment process control strategies of 55SiCr high strength automobile. The first chapter is introduction; the second chapter introduces the experimental principle and method, introduces the main process line of high strength spring steel; used in study on the production technology of suspension spring wire rod third chapter of automotive high strength; the fourth chapter is the test and performance test. Fifth the grass for the summary and prospect.