不同凸凹模结构组合对金属板料冲孔质量研究OA

The burr during the punching process will reversely move with the return of punch,seriously decreasing the hole quality.To minimize the burr formation,a numerical simulation model was developed using the Johnson-Cook dynamic constitutive model(J-C model)in ABAQUS.By contrasting the simulation result with the experimental result of the punching process in 430 stainless steel and analyzing the fracture behavior,the reliability of model was experimentally verified.Then,the different matches of punch and die were comparatively analyzed to reveal the influence of different structures on the punched hole,such as the flat punch matching the normal die,the normal die matching the punch with oblique blade,the countersunk die matching the punch with flat blade and countersunk die matching the punch with oblique blade.The results showed that a punch with oblique blade can significantly soften the quick rise of punching force and the countersunk die can significantly decrease burr formation.The combination of the two structures will realize an optimized result for the service life of punch and burr formation.The optimization of the punching process based on ABAQUS simulation provides theoretical support and technical guidance for actual metal sheet punching processing,which can significantly decrease the development cycle and effectively improve the machining quality.