Φ36mm～ Φ219mm pipe

Two-roll hot-rolled seamless pipe production line

1.Accu-Roll features :
     Accu-Roll hot-rolled seamless steel pipe production line processes Accu-Roll two-roll pipe mill.The unit is a cross-rolling mill,Accu-Roll mill increases the rolling angle of the roll,lengthened the length of the roll body,using the upper and lower guide plate to improve the accuracy of the wall thickness of steel pipe and the rolling speed and production capacity.Suitable for small-volume,multi-standard thin-walled steel pipe production,widely used in the production of oil well pipe and precision steel pipe.

2.the rolling process :
    Heated tube blank by tapping machine from the furnace on the ramp,the blank by its own weight rolled into the piercing machine before the transport roller;tube through the roller and transverse transfer rack to the piercing machine front chute,Start the push machine to push the round tube into the process to be set punch perforation machine hole perforation rolling perforation of the capillary in the perforation machine under the guidance of three roller core stably discharge.When the tube is bite into the roll,the pusher rolls back to the original position.Under the action of rollers,guide plates and heads,the round tube blank is perforated into a hollow capillary tube with the geometrical dimensions stipulated in the process.After the piercing is completed,the ejector rod carriage drives the ejector rod and the head back to the specified position of the craft,and the capillary tube is set aside by the turning mechanism.
     Perforation of the capillary by the inclined ramp and feeding institutions roll to the rolling mill front desk.And then by the mandrel car driven mandrel into the capillary is inserted into the mandrel graphite was lubricated,mandrel wear to the designated location of the process,start rolling mill front desk,the capillary and the mandrel together into the process set of rolling pipe Machine hole in the wall,wall reduction,rolling process into the provisions of the geometry of the shortage of waste management.Dry pipe under the action of the long guide roller steady progress;thick-walled tube rolling machine without rolling machine can be directly through the rolling mill;rolled after the shortage of pipe from the rolling mill machine output;into the front of the reducer High-pressure water descaling,and then transported to the 14-rack three-roll micro-stretch reducer reduced to the geometric dimensions of the finished hot finished tube;
    Directly through the reduction of thick-walled pipe technology,from the rolling mill into the high-pressure water descaling,and then transported to the 14-rack three-roll micro-stretch reducer sizing.
    The diameter of the pipe after the single ruler directly transported to the cooling bed cooling to below 100^oC,double-rolled steel pipe with a hot saw segment,and then sent to the cooling sub-cooling.Then the pipe is delivered to the discharge box aligned package.

3.the history of technology development:
    Seamless steel pipe production has nearly 100 years of history.German Manisman Brothers first invented in 1885 two roller cross-piercing punching machine,in 1891 invented the cycle of pipe rolling machine,in 1903 the Swiss Shi Feifel(RCStiefel)invented the automatic pipe mill(also known as head-type rolling Pipe machine),and later appeared a continuous tube rolling mill and pipe jacking machine and other extension machines,began to form a modern seamless steel pipe industry.
    Nineteen thirties due to the use of three-roll pipe mill,extrusion machine,periodic cold rolling machine,improved the quality of steel varieties.
    In the 1960s,due to the improvement of the continuous tube rolling mill,the emergence of the three-roll perforating machine,especially the application of tension reducing machine and continuous casing slab,improved the production efficiency and enhanced the competition ability between the seamless pipe and the welded pipe.In the 1970s,seamless pipes and welded pipes are keeping pace.The world's steel pipe production is increasing at an annual rate of over 5%.
    After 1953,China attached importance to the development of seamless steel pipe industry and has initially formed a production system for rolling all kinds of large,medium and small pipes.Seamless pipe is also generally used billet oblique rolling perforation,rolling mill machine,coil drawing process.