1. Cross-section ovalization is one of the flaws in the thin-walled tube NC bending process.
   截面畸变是薄壁管小弯曲半径数控弯曲成形容易出现的成形缺陷之一。
2. The failure of directly buried heat-supply pipeline is discussed, and the design essentials are put forward in accordance with local buckling and ovalization deformation.
   探讨了直埋供热管道的失效,针对局部失稳和椭圆化变形,提出了设计要点。

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