1. The blanking process should not use brittle and hard materials.​
Punching, blanking and cutting processes, such as brittleness and hardness of materials should not be used. The more brittle the material is, the easier it is to tear during blanking; ​the material is strong, such as high carbon steel, cutting surface flatness is very large, especially for thick material blanking.

The material with good elasticity and high flow limit can get a good cross-section. In particular, soft materials such as low zinc brass can be blanked to produce smooth sections with little inclination.

2, the bending process should not use high elastic materials.​
High elastic materials should not be used in the bending process. The greater the elasticity of the material, the greater the springback of the forming part to the original state after bending, resulting in the Progressive Die Stamping workpiece can not reach the predetermined shape, the need for many times to try the die, repair the die.

The material for the bending process shall have sufficient plasticity, low yield point and high elastic modulus. The former ensures no cracking, while the latter enables the workpiece to easily reach the exact shape. The most suitable materials for bending are mild steel, pure copper and pure aluminum.

c7f8bca6a79d199fae146007871347043. Materials with poor plasticity should not be used in deep drawing process.​
The material with poor toughness should not be used in the deep drawing process. Because the deformation degree of low plastic material is small, it is necessary to increase the number of deep drawing processes and intermediate annealing. The material used in deep drawing should have strong toughness, low yield point and good stability.

The smaller is the ratio of yield point to tensile strength, the better is the drawing performance and the greater is the limit degree of one deformation. Commonly used for deep drawing materials are low carbon steel, low zinc brass, pure aluminum and aluminum alloy, austenitic stainless steel.

4, cold extrusion process should not use high strength, low plasticity materials
Cold extrusion process should not use high mechanical strength, low plasticity material, so as not to increase deformation resistance and crack. Cold extrusion requires high plasticity, low yield point and low susceptibility to work hardening.

The most suitable materials are pure aluminum and aluminum alloy, brass, tin phosphor bronze, nickel, zinc and zinc cadmium alloy, low carbon steel and so on.

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