Research on the Current Assisted Roll Forming of Ti2AlNb Alloy Corrugated Sheet
The honeycomb structure of Ti2AlNb alloy is prepared by the integrated process of roll bending and thermal adjustment and spot welding,which has some defects such as long process period,high energy consumption,low component precision and poor reliability.In this paper,the current assisted roll forming process of Ti2AlNb alloy honeycomb corrugated sheets is proposed,and the high current density in local forming position is used to inhibit springback defects.At the same time,the honeycomb structure is prepared by diffusion bonding technology to realize the reliable connection of the honeycomb structure.When the current density is higher than the threshold(20 A/mm2),the current density has a significant inhibitory effect on the springback of V-shaped bending.When the current density reaches 60 A/mm2,the springback defect is basically eliminated.When the loading current increases to 66 A/mm2 during the current assisted roll forming process,the forming angle of the corrugated sheet is reduced from 125.5° to 121.3°.The Ti2AlNb honeycomb structure diffusion bonding tool was designed.The honeycomb structure sample was prepared under hot pressing process parameters of 970 ℃/15 MPa/2 h.The size of hexagonal cell was the same and the precision was high.
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