The raw material for rolling seamless elbow fittings is round tube blank. The round tube blank is cut and processed by the cutter, and the blank with a length of about one meter is sent to the furnace for heating through the conveyor belt. The billet is sent into the furnace for heating at a temperature of about 1200 degrees Celsius. The fuel is hydrogen or acetylene. Temperature control in furnace is a key problem After the round tube blank is discharged from the furnace, it should be pierced through the pressure piercer. Generally, the more common piercer is the cone-shaped roll piercer. This kind of piercer has high production efficiency, good product quality, large perforation expansion, and can wear a variety of pipe fittings. After piercing, the round tube blank is successively cross rolled, continuous rolled or extruded by three rolls. After extrusion, the pipe shall be removed for sizing. The sizing machine rotates the conical drill bit into the steel embryo at high speed to drill holes to form pipe fittings.
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