Rebound phenomenon is common during sheet metal forming one of the defects. To improve product quality and shorten the stamping of new product development cycle, must be accurate springback prediction and effective control. With the auto industry, automotive stamping parts stamping problems become more difficult in the spring, especially in high-strength steel stamping rebound in the international context has attracted wide attention. How to predict and control the current rebound has become a research hotspot and difficult one. How to predict and control the rebound, at home and abroad mainly in ordinary steel stamping parts, while the high strength steel stamping springback are limited. Between the present situation, this thesis to study the characteristics of high strength steel, and then use the finite element simulation software DYNAFORM springback of high strength steel in the simulated laws of exploration. This paper first summarizes the automotive stamping and metal forming in the deformation characteristics of springback prediction method introduced Research and development history, comparing obtained numerical simulation for stamping springback prediction is very effective. Then, we will highlight the characteristics of high strength steel and its weight to bring the importance of car. Analysis of forming and springback simulation of stamping on the springback simulation accuracy factor. Using DYNAFORM parts of U-shaped type and rebound the numerical simulation, analysis of the impact and rebound Stamping Forming a key element: BHF, drawbead resistance, friction coefficient and die clearance. Explores the relationships between them: stamping springback with BHF, drawbead resistance and friction coefficient decreases; with the increase of die clearance. In the final chapter describes some of the commonly used method to control the stamping springback, focuses on the mold surface Compensation Act, the reference car hood as a Case Study on the die surface and the compensation method for case analysis in depth. The method produced consistent with the design requirements the actual product, indicating that the method is feasible.
Key words: high strength steel; stamping; rebound; DYNAFORM; numerical simulation
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