弯曲半径为1～2倍管子直径的小弯曲半径的管道已在电站应用了。小弯曲半径的弯管在利用感应加热的弯管机上进行,对管子在一条狭窄的环形区域加热。用此法弯管时,加热区两侧管子的冷却部分将阻碍在弯管区管子产生椭圆。在弯曲力矩和轴向压力的作用下弯曲部分的中性轴向弯管的凸起部分移动,因此,弯管的受拉 Pipe with a small bend radius of 1 to 2 times the pipe diameter has been used in power plants. The bend of small bend radius is performed on a bender using induction heating, heating the tube in a narrow annular area. When this method is used for pipe bending, the cooling of the tubes on both sides of the heating zone will prevent the pipe from forming an ellipse in the pipe section. The convex part of the neutral axial bend of the bent part is moved by the bending moment and the axial pressure,