螺旋槽成形铣削时普遍存在根切现象，在很大程度上影响到加工精度和几何形状。
Usually, there exist undercutting phenomena in helical groove milling process, which affect the accuracy and geometrical shape greatly.
在螺旋焊管生产中采用铣边机铣削带钢边缘和坡口，为螺旋焊管成形、 焊接创造了有利的条件。
To adopt milling machines to prepare strip edges and groove to give good condition for forming and welding of spiral submerged arc-welded pipe.
对螺旋面的成形机理进行了分析。
Firstly, this paper researched the forming mechanism of the helicoidal surface.
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