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7 suggestions for stamping material selection.

2022-12-01

There are many stamping materials to choose from, and if the performance of the material and the processing process can be considered together, the stamping process can be continuously improved, which is conducive to the precision, beauty, and durability of the product. The benefits are obvious. How to choose materials for your stamping parts processing?


1. It is not advisable to use materials with small strain hardening exponents for tensile parts

The strain hardening exponent has a very close relationship with the formability of sheet metal. According to the plastic deformation limit theory, the maximum elongation strain when the sheet is subjected to concentrated stretching is twice that of uniaxial stretching. Under normal conditions, the material will rupture immediately after the necking concentration occurs. Therefore, the larger the strain hardening exponent of the material, the stronger the ability of the material to resist local fracture, the distribution of plastic strain tends to be uniform, and the peak strain is lower. Therefore, materials with a small strain hardening exponent should not be used in molded parts dominated by elongation.


2. The compression molding process should not use materials with poor stability

In compression forming, the deformation zone is mainly achieved by compressive stress and compressive strain to undergo compressive deformation. Sheets are prone to instability and wrinkling under compressive stress. In order to improve the stability of plastic deformation, it is not suitable to choose materials with poor anti-instability ability.


3. The stretching process should not use materials with poor plasticity

It is not suitable to use materials with low elongation during the stretching process. The better the plasticity of the material, the higher its uniform elongation, which means stretching between stable deformation and uniform deformation.


4. Hardened material should not be used in spinning process

Common spinning materials are mainly pure aluminum, low carbon steel and stainless steel, of which low carbon steel and stainless steel account for more than 60%. For ordinary spinning, soft materials with good plasticity, low yield point, less impurities and uniform structure should be used.


5. High-strength, low-plasticity materials should not be used in the cold stamping process

The cold stamping process should not use high-strength, low-plastic materials to avoid increasing deformation resistance and crack resistance. The requirements for cold stamping and other volume forming of materials are: materials should have high plasticity, low yield point and low work hardening sensitivity. Commonly used cold stamping materials are pure aluminum and aluminum alloys, copper and copper alloys, low carbon steel, medium Carbon steel, low alloy steel, etc. Products stamped with this material have a smooth surface, dimensional accuracy and can withstand high pressure. One-time plastic deformation, punching out products with complex shapes.


6. High elastic materials should not be used in the bending process

Steel for stamping and bending needs to have good plasticity, low yield strength and low elasticity. The steel with good plasticity is not easy to bend and crack during the bending process. Its low output, high strength and low elasticity steel has small rebound deformation after bending, and it is easy to obtain accurate bending shape.


7. Materials with poor plasticity should not be used for elongation forming

During the stamping process, flaring, reaming, bulging, bending, eversion and partial stretching are extension-type deformations. Since the deformation zone is mainly subjected to tensile deformation by normal stress and normal strain, the material in the deformation zone is prone to excessive elongation. When the elongation exceeds the ultimate elongation of the material, it is easy to break, so it is not suitable to use materials with poor plasticity in the elongation forming process.


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