Large diameter tube expanding machine is the main equipment

Large diameter tube expanding machine is the main equipment for processing steel pipe  

The processing method of large diameter thick wall seamless steel pipe relates to the field of mechanical processing, specifically involving the processing method of large diameter thick wall seamless steel pipe, namely the pipe expanding machine, including the following steps:  

Billet smelting and treatment, the ingot (or billet) is the raw material of pipe, the selection of cold ingot, ingot surface cracks to be cleaned and polished, pits and cleaning pits to be special treatment to prevent folding, ingot riser and bottom must be removed;  The billet is heated before forging. The billet can not be directly sprayed into the billet by vertical heating flame. In addition, the billet is heated to below 1290℃ by gas fuel, and the heating rate is 50 ~ 150℃ / h.  Forging materials and processing defects, the blank is descaled, that is, the oxide scale around the blank is beaten off to prevent the oxide scale from falling into the die and forming surface defects in the forging process;  The invention has simple operation process, reasonable design, avoids waste products, reduces raw material and energy consumption, significantly improves labor productivity, and thus brings good economic benefits.