1 hot rolling seamless pipe production in general automatic tube mill. Solid tube blank check and clear the surface defects, cut into required length, in the tube hole end surface of centering, then sent to a heating furnace, in punch.
In perforated while continuing to rotate and advance, in the roll and immediate action, tube gradually form a cavity, called capillary. Sent to the automatic tube rolling mill on rolling. Finally, all the machines are the whole wall thickness, diameter sizing machine, to meet the specifications.
It is an advanced method to produce hot rolled seamless steel tube by continuous rolling mill.
2 in order to obtain smaller size and better quality of seamless tube, cold rolling, cold drawing method must be used or combined. Cold usually in two roller mill, rolling ring groove tapered plug pipe in variable cross section circular slot and the composition of the. Cold drawing was usually in the 0.5 ~ 100T single chain or double chain drawbench.
3 extrusion method is about to heat the tube billet in the closed extrusion cylinder, the punching rod and the extrusion rod move together, so that the extrusion parts from the smaller die extrusion. This method can produce smaller diameter steel pipe.
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