Basic forming process of stamping parts
Forming principle of stamping parts: stamping is a forming processing method for sheet, strip, pipe and profile by applying external force by press and die to produce plastic deformation or separation, so as to obtain the required shape and size of the workpiece (stamping part).
Process classification: stamping is mainly classified by process, which can be divided into separation process and forming process.
Separation process (blanking process): its purpose is to separate the stamping parts from the sheet along a certain contour line, and ensure the quality requirements of the separation section. Separation process: blanking (blanking, punching), cutting, cutting, edge cutting, cutting.
Deformation process of sheet metal during blanking
When the die gap is normal, the blanking process of metal materials can be divided into three stages
1) Elastic deformation stage
板料产生弹性压缩，弯曲和拉伸等变形。材料在受到外力作用时产生变形或者尺寸 的变化，而 且能够恢复的变形叫做弹性变形。
The sheet metal has elastic compression, bending and stretching deformation. The deformation or size change of material under the action of external force, and the deformation that can be recovered is called elastic deformation.
2) Plastic deformation stage
When the stress reaches the yield limit, the sheet metal begins to produce plastic shear deformation. It refers to the deformation of material produced under the action of external force and can not be recovered after the removal of external force.
3) Fracture separation stage
The formed crack extends into the material along the direction of maximum strain velocity and develops in wedge shape