Longitudinal mechanical expansion stage
Longitudinal seam steel pipe widely used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, it is one of 20 key product development of our country. For the transport of liquids: water supply, drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural purposes: as piling pipe, as bridges; piers, roads, pipes and other building structures. Longitudinal mechanical expanding the expanding use of the split-side portion of the segments radially expand, so the tube along the longitudinal direction in a stepwise manner to achieve the full length of the tube segments of plastic deformation process.
Longitudinal mechanical expanding there are five big stages:
1. Full circle phases: the segments open until all the segments are exposed to Longitudinal wall, this time within the range Longitudinal steps at various points within the radius of the tube are almost identical, Longitudinal preliminary full circle.
2. The inner diameter of the stage: the segments from the front position began to decrease velocity, until you reach the desired position, this position is a circumferential position within the quality requirements of the finished tube.
3. Compensation stage missile complex: the segments in position to start the second stage further low speed until you reach the desired position, this position is a circumferential position within the Longitudinal elastic recovery process before the design requirements.
4. Packing stable phases: the segments in circumferential position before playing the complex period of time within Longitudinal remain intact, which is the stabilization phase packing equipment and expanding process requirements.
5. Unloading regression phases: the segments began to rapidly retracted from the circumferential position within complex bomb before Longitudinal, until you reach the initial position of the enlarged diameter, which is expanding the technological requirements of a minimum contraction diameter segments.
Longitudinal mechanical expanding there are five big stages:
1. Full circle phases: the segments open until all the segments are exposed to Longitudinal wall, this time within the range Longitudinal steps at various points within the radius of the tube are almost identical, Longitudinal preliminary full circle.
2. The inner diameter of the stage: the segments from the front position began to decrease velocity, until you reach the desired position, this position is a circumferential position within the quality requirements of the finished tube.
3. Compensation stage missile complex: the segments in position to start the second stage further low speed until you reach the desired position, this position is a circumferential position within the Longitudinal elastic recovery process before the design requirements.
4. Packing stable phases: the segments in circumferential position before playing the complex period of time within Longitudinal remain intact, which is the stabilization phase packing equipment and expanding process requirements.
5. Unloading regression phases: the segments began to rapidly retracted from the circumferential position within complex bomb before Longitudinal, until you reach the initial position of the enlarged diameter, which is expanding the technological requirements of a minimum contraction diameter segments.
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