Straight seam steel pipe hole enlargement technology

DSAW steel pipe hole enlargement is a way of using hydraulic or mechanical outward from the steel tube wall strength make steel tube along the radial dilation forming pressure processing technology. Mechanical way than hydraulic way, the equipment is simple and more efficient, in the world's most advanced straight steel located at several control pipe expanding process is adopted, the process is:

Mechanical expanding use of expanding machine end fan-shaped dollop of split along the radial expansion, the tube billet along the length direction in step by step manner, segmented realize the full length of the plastic deformation process. Is divided into five stages

1, the preliminary round stage. Fan open until all the fan-shaped blocks are in contact with the steel tube wall, the step length within the scope of steel pipe at various points in the circular tube radius size are almost unanimously, get a preliminary round steel pipe.

2, stage of nominal diameter. Fan block from the front position began to reduce the movement speed, until arrived at required position, the position is the quality requirements of the finished pipe circumferential position.

3, after compensation phase. Fan block in the position of the two phase will further lower speed, to require position, this position is the process design requirements of the complex steel pipe circumferential position before.

4, pressure maintaining stable stage. Fan piece of structural steel pipe circumferential position before playing after keeping a period of time, this is a requirement for equipment and hole enlargement process pressure maintaining stable stage.

5, unloading regression phase. Fan block from the complex steel pipe before the internal circumferential position began to bounce back quickly, until arrived at the location of the initial hole diameter, it is expanding the fan-shaped dollop of technical requirement minimum contraction diameter.

In practical applications, the process simplified, 2, 3 steps can be combined to simplify, this has no effect on the quality of steel pipe hole enlargement.

More information about carbon steel pipe pls visit:Hunan Great Steel Pipe Co.,ltd