The raw material for rolling seamless elbow pipe fittings is round tube blank. The round tube blank is cut by the cutting machine to process the blank with a length of about one meter, and is sent to the furnace for heating by the conveyor belt. The billet is sent into the furnace for heating, and the temperature is about 1200 ℃. The fuel is hydrogen or acetylene. Furnace temperature control is a key issue The round tube blank shall be pierced through the pressure piercing machine after being discharged from the furnace. Generally, the more common piercer is the cone roll piercer. This kind of piercer has high production efficiency, good product quality, large piercing and expanding capacity, and can pierce a variety of pipe fittings. After piercing, the round billets are successively cross rolled, continuously rolled or extruded by three rollers. After extrusion, the pipe shall be disconnected for sizing. The sizing machine rotates into the steel embryo at a high speed through a conical drill bit to drill holes and form pipe fittings.
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