The Thoerical And Fe Simulation For Hole-Flanging On Mid-Thick Metal Sheet

Flanging is one basic process of stretch stamping forming. In practice, there are so many parts manufactured by flanging process in many fields. With development of petroleum, nuke and power transmission industry, many parts produced by hole-flanging on mid-thick metal sheet. Many cylinder parts need to form a lip to connect branch pipe. However, compared with thin sheet metal, hole-flanging mid-thick metal process is very limited in existing documents. Therefore, it is necessary to pay a special attention to the hole-flanging on mid-thick metal sheet.There are main research works and some results as follows:1. The total theory of plasticity was employed in this paper to analyze the strain and stress of the cold hole-flanging on mid-thick metal sheet. An equation to calculate the lip thickness was introduced. Through comparing the results obtained from the presented equation with experimental values, it found that theoretical and experimental results were in strong agreement with each other.2. The different punch shape impact on the mid-thick hole-flanging process is analyzed. The hole-flanging process has been simulated in Deform3D software. Through the simulation, the different stress and strain conditions between the process use cylindrical punch, conical punch and spherical punch have been compared. The most suitable punch shape has been chosen.3. The FEM of hole-flanging model was established in Deform3D software in this paper. And the effects of forming parameters such as pre-determine hole size, clearance between punch and die and die fillet radius were explored in simulation process. According to the process which was simulated in the Deform3D software, the regression equation was established by the least squares method. The parameter was selected and validated. Then the reasonable parameters of hole-flanging process were achieved by the optimized mathematical model. The results are useful for the practical hole-flanging process.In a word, the content and theory about mid-thick metal sheet forming process is enriched due to the paper. The data and information in the paper can be consulted and referred to by the technologists participating in mid-thick metal sheet forming.