To support the principle of triangulation, etc., the rolling process, the workpiece can improve roundness, concentricity, perpendicularity.
以等三角支撑原理，进行滚压加工，可提高工件真圆度、同心度、垂直度。
2
It's orientated by outer circle of workpiece itself and grinded by support of a supporting plate.
外圆无心磨削是不定心的磨削，由托板支承靠工件自身外圆定位进行磨削。
3
In the process of bending, the excessive length of the straight flange of the bend mold and the workpiece with turnups cladding the lower mold support make a comparatively difficult unloading.