Short process method for rolling thick-walled pipe by retained mandrel continuous rolling unit
A short-process, thick-walled tube technology, applied in the direction of metal rolling, etc., can solve the problems of limited spacing, short length, limited mandrel limit, thick-walled tube expansion of three-roll continuous rolling mill, etc.
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[0013] Embodiment 1, taking the three-roll continuous rolling mill with 5 stands mandrel limit as an example:
[0014] 1) Divide the mandrel-limited three-roller tandem rolling unit into two parts according to the functions. Generally, the first 3-4 stands are used as "rolling stands" for wall thickness control to realize the rolling function of the original mandrel-limited tandem rolling unit; Generally, the last 1-2 racks are used as "finished product racks" for stripping and outer diameter control, replacing the subsequent stripping machine and sizing machine;
[0015] 2) Before rolling, the mandrel advances from the initial position and is inserted into the steel pipe placed in front of the mandrel-limiting three-roll continuous rolling unit, and the front end of the mandrel advances to the first position of the "rolling stand";
[0016] 3) The steel pipe advances to the "rolling stand" for rolling. During the progress of the steel pipe, it acts simultaneously with the man...
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