然后，在同一个地方，把它弯回去形成反方向的直角。
Then, at the same place, bend it back to form a right-angle in the opposite direction.
倒钩：武器或工具，如箭或鱼钩的尖头上按相反方向弯回去的尖钩。
Barb: a sharp point projecting in reverse direction to the main point of a weapon or tool as on an arrow or fishhook.
回弹一直是影响型材拉弯成形质量的重要因素，影响拉弯回弹的因素很多。
Springback is one of the important factors that influence the forming quality of blanks. Many parameters influence the springback.
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