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提出了弯管的空间几何表示方法，研究了几何参数与加工参数之间的相互关系，推导了它们之间的相互转换公式，最后给出了计算实例．
The geometrical representation method of elbow is put forward. The relationship between geometrical parameters and machining parameters is studied. The formula of mutual transformation between them is deduced. Finally, a calculation example is given.