In recent years, along with the rapid development of social economy, people's awareness of environmental protection has been continuously strengthened. The state has introduced the mandatory laws and regulations on automobiles, and safety, environmental protection and energy conservation have gradually developed into three essential elements for automobile production. The light weight of automobiles is a major trend in the development of automobiles today. Lightweight can effectively improve the economics of fuel use and achieve the goal of energy saving and emission reduction. The relevant data shows that if a car can reduce its own weight by 10%, its fuel efficiency will increase by 7 to 8%, and the vehicle's curb weight will be reduced by 100kg, so its fuel consumption will also drop. Therefore, the realization of lightweight vehicles will help the car to save energy and protect the environment. The hot stamping forming technology is a main means to realize the lightweight of the automobile, which can reduce the thickness of the material and ensure the goal of weight reduction on the basis of ensuring the strength of the stamping part.
1. The basic principle of hot stamping forming technology
The so-called hot stamping forming technology refers to the use of high-temperature conditions, the yield strength of the metal will be rapidly reduced, and its ductility and plasticity will be rapidly enhanced, so that the metal becomes a part with the help of the mold. a process technology.
The basic principle is: heating a special boron alloy steel (with high strength) to make it completely austenitized, then placing the red hot sheet in a mold (cooling system) for stamping and cooling Quenching, in turn, transforms the steel sheet structure from austenite to martensite, and finally obtains a steel with an ultra-high strength ratio. This technology has been widely used in industrial production in some developed countries due to its advantages of improving safety and reducing quality, especially for the production of high-strength steel.