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在供热通风与空调工程中,通风管道制作的好坏直接影响系统的安装质量及运行效果。而风管质量的基础就在于放样准确性,在工程中常用的放样方法有作图法、解析法及计算机辅助设计法等。一、常用放样方法1.作图法首先,根据零件的形状特点进行分析,以图1所示的天圆地方为例,将其分成4个相等的等腰三角形和4个相同的局部斜锥面;然后在三视图的基础上,用直角三角形法求出各组成部分表面所有邻边线段实长;最后在展开图上,
In the heating ventilation and air conditioning projects, the production of ventilation ducts directly affect the quality of the installation and operation of the system. The basis of duct quality lies in the accuracy of stakeout. Commonly used in engineering projects are mapping methods, analytical methods and computer-aided design. First, the common lofting method 1 mapping method First of all, according to the shape characteristics of the parts to be analyzed, as shown in Figure 1 days round place, for example, will be divided into four equal isosceles triangles and four identical local oblique cone Then, on the basis of the three views, the right-angled triangle method is used to find the real length of all the adjacent line segments on the surface of each component. Finally, on the expanded view,