The Numerical Simulation And Experimental Research On Bending Springback And Die Surface Compensation

Springback,one of the most universal phenomenon in the stamping process,is inevitable, it directly affect the quality of stamping parts. The Control to Springback,which has a major impact on the quality, cost and development cycle of the product, is a difficult engineering problem. Springback problem in sheet metal parts is very complex, the final shape of Stamping parts after rebound is the accumulation effect of entire forming process, and the sheet metal forming process is closely related to die geometry, material properties, friction contact and stamping process parameters and other factors.This dissertation select several factors of the appropriate level, which affect the springback, and design orthogonal Lest with the rebound value size as the evaluation index, it research and analysis several key factors influencing the bending springback of he U&V-shape part under certain material parameters conditions through the combination of numerical simulation and Orthogonal test. Then Optimize the molding process through the analysis and the explanation to the conclusion, the main factors affecting springback size, validate the result of the simulation Using the experiment.On this basis, we explore the die surface compensation method based on simulation, which select the non-uniform springback of U-shape part as the study object,The results obtained has important engineering significance on the reduction and control of springback in sheet metal forming in the actual production process and the improvement of the accuracy of manufacture, the reduction of the cost of mold design and the new product development cycle.The main contents of this dissertation are as follows:1. Systematically summarize the research results in springback progress, points out that the finite element numerical simulation is becoming the most effective method for the prediction of the springback, Die surface compensation method based on the simulation and experiment is the most effective way to control springback.2. Analyze the mechanism of springback defects, the springback characteristic and form of U/V-shape. Summarizes the main factors that influence the springback,the common measures to control springback. and the springback control principle through the die surface compensation method.3. Discussed some of the key technologies about springback prediction accuracy of the numerical simulation:material model, selection of unit type, solving process and algorithm and the contact friction, on this basis, summed up a set of the most effective numerical simulation method for springback problem, and summarizes the general steps of springback analysis through Dynaform.4. Analysis the influence on the rebound trend of several overlapping factors, using orthogonal experiment and numerical simulation, deal with the results using poor analysis method.carried on the preliminary optimization of stamping process parameters by selecting the optimal scheme.points out that the use of orthogonal experiment analysis has certain guiding significance to control the springback.5. Analysis the non-uniform springback of U-shape part, Explore the die surface compensation method based on simulation,put forward a kind of springback compensation method applied in inhomogeneous springback parts based on the geometry of parts.