The steel pipe extrusion process includes the following production processes:
① Billet: round billet after peeling, cut length, drilling, machining and cleaning, you can form a hollow tube for the blank ready.
② Billet heating: according to different steel, can be divided into three heating stages to ensure that the production process to meet the required temperature.
③ Preheat: a floor gas furnace will be used for the first step of heating, the blank preheated to 700 ℃ ~ 900 ℃.
④ Induction heating unit (the first stage): the first group of induction heating unit will be heated to the blanking process required temperature, about 1100 ℃ ~ 1250 ℃, the specific temperature value determined by the production of steel. Induction heating unit using low frequency heating mode.
⑤ Blank lubrication: in the hole before the first glass fiber lubrication.
⑥ Reaming: The round billet that has been drilled before squeezing must start to reaminate from a smaller pilot hole until the inner bore reaches the final machining accuracy.
⑦ Induction heating unit (second stage): The second set of induction heating unit is used to continue heating the intermediate blank after the blank is reamed. Depending on the normal operating conditions of the transport conveyor, it is required to heat the intermediate billet to 1200 ° C or to the temperature required by the material.
⑧ Extruder: billet loaded to the extruder, through the extrusion process into steel pipe. Extruder auxiliary system is responsible for feeding, replacement extrusion die, squeeze the use of the pressure and the separation of the remaining material head.
⑨ Cooling pool: cooling pool is arranged on the side of the output roller for rapid cooling of steel.
⑩ Cooling bed: in the need for air cooling, the pipe can be transported to the cooling bed.
