Regarding the problem of rounding large diameter round tubes
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During the machining process, we may often encounter the problem of rounding round pipes with a diameter greater than 89mm. I wonder if you have any good methods to borrow, so why don't we discuss it together. After being rolled by a rounding machine, the pipe will become an elliptical shape, and the cost of basic tooling for rounding after heating is too high.
After the weld is welded, it is then rounded on the rounding machine. Generally, there are two methods of joining round pipes. One is to butt the ends of the round pipes and then weld them. During welding, the long axis of one pipe is opposite to the short axis of the other pipe, and the long and short sides are complementary. ； The other is flange connection, which uses the inner hole of the flange to control the out-of-roundness of the round pipe.
For 200mm pipes, it would be better to use ready-made pipes and elbows. Large-diameter pipes such as flues are rolled first and then welded, and are reinforced with angle steel frames to maintain roundness. After welding, should we use a welding seam or a rounding machine?
Specific process: Cutting (expand the size according to the medium diameter) - rolling (gap 0-2mm, wrong edge ≤ 1.5mm) - spot welding - welding - rounding.