Hole shapes: Round holes, long holes, triangle holes, oval holes.
孔形：圆孔、长孔、三角孔、椭圆孔、浅拉伸鱼鳞孔等。
2
Plane warping deformation and interior holeoval deformation occur easily for spread bevel gear at carburization and hardening.
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。
3
The paper respectively studies the principles and features for profiling attachment and slider crank mechanism to be used as clamping apparatus to fabricate oval hand hole cover.