The Research On Springback In Stamping Forming Process Of Nickel Plate And Robust Design

With industrial technology is continuously developing, people’s requirements for the property of the thin plate are improving. Coating material which is the material of products with high performance has been widely used because of its good property. As a kind of common coating material, the springback phenomenon of nickel plated sheet is inevitably producing in the process of stamping forming and it may impact the forming precision of the work-piece and the subsequent assembly quality. Therefore, it has very important significance to study the springback in the stamping forming process of nickel plate. This paper studies the springback phenomenon based on the numerical simulation, genetic algorithm experimental validation and robust design. The specific research is as follows:(1) This paper establishes finite element model for the stamping forming process of nickel plate. Numerical simulation is established by using DYNAFORM software. The value of springback angles are recorded before and after casting. Then the stamping experiments on the universal testing machine are finished to obtain the springback angle of molding parts. The reliability of numerical simulation on sheet stamping forming of nickel plate is verified.(2) To study the effects of blank holder force, friction coefficient, die radius and stamping speed on the springback, the scheme of orthogonal experiment is designed. The springback angles of 16 different process parameters combination group are obtained after stamping forming of plating nickel sheet by using simulation software DYNAFORM. Range analysis and variance analysis for test results are analyzed and the influences of process parameters on springback angle of sheet in stamping of nickel plating are studied.(3) The varied width Gaussian kernel function is compared with the original radial basis function based on mathematical validation. The former has superior accuracy and the fitting precision than the latter.(4) This paper establishes a mathematical model of robust design for plating nickel sheet stamping forming springback. Combined with width Gaussian kernel function model, robust design is carried out for the plating nickel sheet stamping forming springback. This paper obtain blank holder force and die clearance by robust design. Under the condition of optimized process parameters, the numerical simulation is finished in software DYNAFORM. The effectiveness of robust design method in nickel plating on the springback of sheet stamping forming is verified based on the width of the Gaussian kernel function model.