Drawbead restraining force when the sliding direction of the sheet is not normal to the drawbead line -study on drawbead restraining force in sheet metal forming III-

摘要

The quality of final product depends on how well the sheet material under the tools in the forming process is controlled to prevent tears and wrinkles. Drawbeads are used to control the material flow in the automotive panel forming. However,simulating the drawbead forming process is time consuming. The method of reducing the calculation time has been proposed. But it doesn't include the drawbead effect on the material flow direction inclined against the drawbead. We need to develop apractical but accurate method of modeling the drawbead effect as well as a method of estimating the restraining force as a function of the direction of drawbead line and geometry. We therefore developed a specific apparatus to measure the drawbead forceunder a different clearance and different sheet sliding directions against the drawbead line. We also simulated the drawbead forming process to obtain a general understanding of the drawbead effect.