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根据锥形水射流钻头螺旋曲面叶轮的几何展成原理，研究了用数控电火花成形机对其展成加工一次成形的方法，讨论了展成加工中存在的电极干涉而导致的过切现象以及成形电极的修正设计方法。
According to the geometric development principle of conical water jet bit helical curved surface impeller, the method of forming once with CNC EDM was studied. The over-cutting caused by electrode interference in the process of forming and processing was discussed. Modified electrode design method.