通风管道展开如何进行下料？
How to cut the material when the ventilation duct is expanded?
怎样正确地进行通风管道下料？本文针对这些问题分析通风管道展开下料的基本步骤，为施工人员提供参考借鉴。
How to cut the ventilation duct correctly? Aiming at these problems, this paper analyzes the basic steps of ventilation duct blanking, and provides reference for construction personnel.
通风管道展开下料是当风管中的一些零部件（管件）必须通过展开下料的方式进行加工才能制作完成时需进行的工作。其中的展开，即按管件设计施工图纸的规划，根据其实际大小将其平铺在板料表面。这项工作之所以重要，是因为其不仅直接关系到风管及其部件质量，也关系到风管材料的使用效率。故对其进行研究分析具有很重要的意义。
The unfolding and blanking of ventilation duct is the work that needs to be carried out when some parts (pipe fittings) in the air duct must be processed by unfolding and blanking before they can be made. The expansion is to lay it on the surface of the sheet according to the actual size according to the planning of the pipe design and construction drawings. This work is important because it is not only directly related to the quality of air duct and its components, but also related to the efficiency of air duct materials. Therefore, it is of great significance to study and analyze it.