The spin forming of the head is divided into cold spinning, warm spinning and hot spinning. Cold spinning refers to the spin forming of the blank sheet at normal temperature. Due to the plasticity limitation of the material, there are not many head materials that can be formed by cold spinning.
The head spin forming technology is mainly used for the forming of the plate head and some heads which are difficult to be cold deformed. Spin forming, which typically heats the metal to a temperature below the recrystallization temperature or forge temperature, is referred to as warm spinning. Hot spin forming is performed by heating the metal to a temperature above the recrystallization temperature or the forging temperature. As the temperature increases, the plasticity of the metal increases. The influence of deformation speed on plasticity is a complicated problem. As the deformation speed increases, there is both a side that reduces the plasticity of the metal and a side that has the opposite effect, and the influence of the deformation speed at different temperatures is also different.
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