Cross-section ovalization is one of the flaws in the thin-walled tube NC bending process.

截面畸是薄壁管小弯曲半径数控弯曲成形容易出现的成形缺陷。

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.

讨了直埋供热管道的效,针对局部稳和椭形,提出了设计要点。