Straight seam steel pipe expanding technology

Straight seam steel pipe expanding is a process that a use of hydraulic or mechanical means forcing the steel pipe from the pipe wall bulged outward along the radial pressure molding process. Mechanical way is more simple and efficient than hydraulic equipment in the world's most advanced several large-caliber straight seam steel pipes expanding regulatory processes, which is as divided into five stages:

1, preliminary stage full circle.

Segments open until all segments are exposed to the pipe wall, then the step size in the range of the steel tube radius of each point are almost identical, steel preliminary full circle

2, the nominal inside diameter of the stage.

From the starting position of the segments to reduce the preceding velocity, until it reaches the required position, this location is within the quality of the finished pipe circumferential position.

3, playing complex compensation stage.

Segments in a position to start the second step further a low speed until it reaches the desired position, this location is within the design requirements of the process of elastic recovery before the pipe circumferential position.

4, pressure stable stage.

Segments in the complex before the pipe bomb circumferential position for some time remain intact, which is a stable phase packing equipment and expanding process requirements.

5, unloading return to the stage.

Segments circumferential position began to rapidly retract from the bomb before the steel complex, expanding until the arrival of the initial position, which is expanding process requirements shrink the diameter of the smallest segments.