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Erica Zhu Feilong Jiangli

Stamping process design stamping direction selection

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        Stamping direction selection is an important part in die design. It not only determines whether a satisfactory drawing piece can be drawn, but also affects the number of supplementary parts and the shape of blanking surface. The stamping direction includes two aspects, that is, the location of the production and the processing direction of the technological characteristics. Locally, each process feature has its best punching direction. However, the stamping process of panel often contains many process features, and the optimal stamping direction of each process feature is not consistent. Therefore, to determine the stamping direction of a process feature, not only the stamping feasibility of this feature should be considered, but also the coordination with other process features should be considered. Therefore, in the process of process design, it is an optimization problem to determine the stamping direction of all process characteristics of a process.

        Most automotive panels are of complex spatial curved surface shape, which is formed by sheet metal drawing. The deformation is very complex, so it is necessary to optimize the stamping direction. In the process of optimizing stamping direction, the material flow in the stamping process is analyzed firstly, and the principle of determining the stamping direction is put forward. According to the principle, a mathematical model is established, and then the CAD technology is used to optimize the stamping direction.

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    • By 袁春凤 (Tiffany)
      The stamping process can be divided into different classes according to different standards.
      (1) according to the different deformation properties, it can be divided into separation process and forming process.
      Separation process: the material is processed under external force to produce deformation, as used in the deformation part of the equivalent stress reached the shear strength of the material, the material will produce shear cracking and separation, thus forming a certain shape and size of the parts. These stamping processes are generally referred to as separation processes, such as tailoring, punching, blanking, and cutting.
      Forming process: under the action of external force, the equivalent stress acting on the deformed part of the material is between the yield limit and the strength limit of the material. The material only produces plastic deformation, so as to obtain a certain shape and size of the parts. These stamping processes are collectively called forming processes, such as bending, drawing, forming and other deformation processes.
      (2) according to the basic deformation mode, it can be divided into blanking, bending, drawing and forming.
      Punching: Punching, such as punching, blanking, etc., is a process in which materials are cut apart along closed or non-closed contours.
      Bending: The stamping process of bending a material into an angle or shape is called bending, such as bending, crimping, twisting, etc.
      Drawing: The process of drawing a flat blank into a hollow part, or further changing the shape and size of the hollow part with a drawing die, is called drawing. There are thinner drawing and thinner drawing.
      Forming: The stamping process that causes material to deform locally to change the shape of a part or blank is called forming, such as flanging, shrinkage, etc.

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