Factors affecting the quality of metal stamped parts.

(1) Chemical composition of metals
Pure metals have better ductility than alloys. Impurity elements usually cause brittleness and reduce ductility. Different alloys have different effects on ductility.
(2) Metal structure
A single-phase structure has greater ductility than a multiphase structure. The nature, shape, size, quantity and distribution of the second phase are different, and their effect on ductility is also different. The fine-grained structure has better ductility. than a coarse-grained structure. Casting. The structure contains large columnar grains and defects in the form of segregation, inclusions, bubbles, porosity, which reduces the ductility of the metal.
(3) Deformation temperature
As the temperature increases during the stamping process, the ductility also increases, but the increase is not a simple linear increase.
(4) Strain rate
An increase in the strain rate not only reduces the ductility of the metal, but also increases the ductility of the metal. The combined action of these two factors ultimately determines the change in the ductility of the metal. The effect of strain rate on the ductility of a metal during hot deformation is greater than during cold deformation. At different deformation temperatures, the effect of strain rate on ductility is also different.
(5) Mechanical deformation conditions
The greater the number of compressive stresses and the greater the value at the main stress state, the better the ductility of the metal. On the contrary, if the number of tensile stresses is greater and the magnitude is greater, then the ductility of the metal will be worse. Compressive deformation promotes the development of plasticity, and tensile deformation is detrimental to plasticity. The most favorable for development is the plasticity method with a three-sided diagram of the main compression stresses and a diagram of the main deformations of two-way compression and one-way tension. plasticity of metal.
(6) Other factors
With intermittent deformation, the ductility of the metal can also be improved, especially during thermal deformation of a low-plasticity metal. The larger the size of the deformation body, the lower the plasticity, however, when the size of the deformation body reaches a certain critical value, the plasticity will no longer decrease with increasing volume.