Investigation of Cryogenic Forming for 2A12 Aluminum Alloy Conical Part
To avoid the occurrence of wrinkling and splitting in the forming of aluminum alloy conical parts at room temperature,the cryogenic forming process for aluminum alloy conical parts is proposed according to the"dual enhancement effect"of enhancement ductility and hardening ability at cryogenic temperature.The 2A12 aluminum alloy conical part with a diameter of 300 mm was studied through numerical simulation and process experiments and the laws of the distribution of stress,strain,and wall thickness distribution during the deep drawing process of conical curved parts with different conical angles were clarified.Under liquid nitrogen temperature conditions,the elongation of the 2A12-O aluminum alloy increased by 92.1％and the hardening index increased by 29.2％compared to room temperature,showing a significant"dual enhancement effect".As the angle of the conical part increased,the minimum blank holding force preventing wrinkling increased and then decreased.The large deformation area transferred from the die corner to the punch corner of the part and concentrated deformation occurred at the punch corner area causing severe thinning of wall thickness.The concentrated deformation in the punch corner area was suppressed under the gradient ultra-low temperature,thereby the wrinkling can be prevented by increasing the blank holding force.A conical curved part was successfully produced and the forming height increased by 132.9％compared to the condition of room temperature.The study can provide theoretical guidance for the one-time high-performance precision forming of aluminum alloy deep cavity conical curved parts.
aluminum alloyconical partcryogenic formingdual enhancement effectdeformation law
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