Before the production of spiral welded pipes, the production line needs to be adjusted and changed. A method for adjusting the shape and changing lanes of a spiral welded pipe production unit is carried out according to the following steps:
Make an overall plan for the entire process of shape adjustment and lane change, make a reasonable layout, and formulate a reasonable operating process. Using this method can improve employee operating efficiency, improve work quality, and reduce rework, reduce the time for shape adjustment and lane change, and reduce costs. role.
The adjustment process of the front swing-type spiral welded steel pipe production unit is different from that of the traditional ground-mounted spiral welded pipe production unit, mainly due to the structural form of the front swing-type unit itself. Through the experience and lessons of multiple adjustments and production of the front swing-type unit, the rule of “three centers, two lines, and one elevation” has been summarized, which has been well applied in production debugging.
Taking the three-roller or five-roller former of the outer-hugging spiral welded steel pipe commonly used by spiral welded pipe manufacturers at present as the research object, and based on the elastoplastic deformation theory of metal materials under the premise of making some basic assumptions, the steel plate in Force model in the former.
Taking the steel plate stress model and the actual structural parameters of the spiral steel pipe three-roller former as a whole, the spiral steel pipe adjustment parameter calculation formula was derived and the calculation program was compiled.
Theoretical research shows that in order to make the spiral welded pipe produce zero or small rebound after welding, the lower pressure roller in the three-roller former must be moved down by another displacement amount based on the theoretical circumferential position when adjusting the shape. To ensure that the steel plate has a larger elastic recovery space after plastic deformation.
According to the data parameters provided by the factory, the adjustment parameters of the three forming rollers or three forming rollers in the former were calculated and compared with the adjustment parameters currently used by the factory. The results showed that they were basically in line with the actual situation. The mechanical model established Correct, the theoretical adjustment parameter values are consistent with the actual adjustment parameter values.
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