螺旋伞齿轮在渗碳淬火时极易发生平面翘曲变形和内孔椭圆化变形。

Plane warping deformation and interior hole oval deformation occur easily for spread bevel gear at carburization and hardening.

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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。

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.

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另外，利用数值模拟方法还进行了工艺参数对熔池形态影响的研究，结果表明，对接间隙促进了熔池纵横向宽度的椭圆化。

The influence of the welding parameters on molten pool were studied by numerical simulation. The results showed the gap enhance the molten pool being ellipse.

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