超临界锅炉水冷壁螺旋管屏的平衡管管孔加工难点和要点，以及解决的工艺措施。
The main points and difficult points in the drilling machining of balance tube for screw panel in the drilling and the method of solving these problems are introduced in this article.
工业锅炉制造中管孔加工量约占锅筒集箱工作量的40%，操作者失误即可能造成该锅筒报废。
The processing capacity of the holes in pipe is about 40% of the processing capacity of the boiler drum and collecting header in boiler fabrication.
真空管加密排列看起来容易，做起来是很难的，主要问题一是内胆管孔连接处过窄后加工难度大，极易变形。
Vacuum tube encryption arrangement looks easy, it is very difficult, the main problem is a liner tube hole connection is too narrow after the processing difficulty, easy deformation.
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