The arcs of tubular parts with stereo turning angles are not coplanar. Ordinarybending machine can not bend a space turning angle.
在摩托车车架等构件中，立体转角管状零件各圆弧均不共面，在普通弯管机上没有空间转角功能；
2
It is so difficult to get non-scrape surface using ordinarybending die. Thus a new bending die structure is provided, and its forming process is analyzed as well.
用一般的折弯模很难达到不擦伤表面，对此，提出了一种新的折弯模结构，并分析了其成形过程。
3
For the bending forming problems, more ordinary finite elements need to be adopted because of shear locking phenomena.