一种双叉管接头展开图的ＣＡＤ许镇（天津理工学院３００１９１）张玉琴（天津大学）吴家宁（天津理工学院）１引言在管道设计中常遇到设计位于大圆管与小圆管之间的分成双叉的连接管。这种双叉管的设计有二种形式：一种双叉管的设计如图１所示，三个管子的轴线位于同一... (Tianjin University of Technology 300191) Zhang Yuqin (Tianjin University) Wu Jianing (Tianjin Institute of Technology) 1 Introduction In the pipeline design is often encountered in the design is located between the large round tube and small tube into Bifurcated connecting pipe. The design of this double-ended pipe has two forms: a double-fork pipe design shown in Figure 1, the three pipe axes are located in the same ...