1.It is able to pierce difficult-to-deform metals and the thickness accuracy of the hollow bloom can be controlled between 8% to 10%.；
2.Big elongation and big diameter expansion can be achieved. The elongation coefficient and expansion can respectively reach 4 to 5 and 30% to 40%.；
3.The twist occured during piercing can be significantly reduced and the surface quality of the hollow bloom can be efficiently improved.。

1.It is widely applied by tubing and casing production enterprises. ACCU ROLL Pipe Mill has made a great contribution for China's tubing and casing production.
2.At present ACCU ROLL pipe Mill we have produced its D/T ratio is up to max. 35, and extension coefficient to 1.5.
3.ACCU ROLL Pipe Mill produced by baineng uses cone type roller and large-diameter rotating guide plate for rolling, the pipes which are rolled own many advantages such as good pipe surface quality and uniform wall thickness.
4.In ACCU ROLL Pipe Mill the mandrel operation mode can be configured according to customers' process requirements, mainly retaining mandrel and floating mandrel two types.

1.To control the operational speed of mandrel,during the whole preocess of tube rolling, the mandrel moves forward with a constant speed which is lower than the outlet velocity of the first rolling mill , thus shortening the mandrel working length. Large, medium-caliber seamless steel tubes are producable.
2.The stable process avoids the "bamboo"-like uneven wall thickness at the top and end of rolling piece caused by floating mandrel rolling.
3.Hole-type can be adopted,which reduces later ral metal flow and improves the accuracy of wall thickness.

1.Product specifications
ASSEL three-roll Pipe Mill is mainly used for producing bearing steel, high alloy steel and stainless steel pipes, maximum rolling outer diameter more than 500mm, and maximum wall thickness up to 100mm and above.
2.Shell accuracy
In the rolling process of ASSEL Three-roll Pipe Mill each cycle can grind shells three times, reeling effect for wall thickness is better, the shells wall thickness accuracy is 1% higher than skew rolling mills.
3.Tool and die consumption and changing time。
ASSEL Three-roll Pipe Mill can use rollers of alloy steel or cast iron, usually when the rollers has produced 4000T thin-walled pipes, it is necessary to stop to change rollers, roll changing time is about 30min. During three-roll rolling, we do not use any tool such as guide plate or guide disc, so we can save tool and die changing time, and improve equipment operating rate.
4.Rolling cost
ASSEL three-roll Pipe Mill, its weight is less; it can produce different specifications of products without additional tools just using three rollers and the mandrel. For ASSEL three-roll pipe mill the roller diam- eter is relatively smaller, rolling pressure and rolling energy consumption is both relatively lower, so roller drive motor power will be reduced. Therefore, those would reduce the one-time investment costs and the costs of tool and die consumption.

1.Increase the wall thickness tolerance(the tolerance can be increased by 1% to 2%).
2.Even deformation. The pipe rolling process is much more smooth and stable. The mandrel stability in the groove is much higher.
3.Increase elongation and heighten the rolling capability of thin-wall pipe and high grade tube, which will reduce the stand quantity and decrease wear and elongate the tool life.
4.The flange area(the area where the pipe neither contacts roll nor mandrel)is much smaller, about 30% less than the double-roll mill, thanks to the groove design of the three-roll mill,which is also helpful in reducing tool wear and material loss.
5.With the same mandrel as in the double-roll mill, the groove geometry of the three-roll mill makes it possible to have a bigger adjustment range but imposes little impact on tolerance. With the same mandrel, it increases the thickness range which can be rolled and decreases the mandrel quantity(decreased by 50%) and the frequency of tool replacement.
6.Increase the precision of wall thickness and decrease the wall thickness difference between the end and the middle part of the shell.
7.The raw material flows with outstanding stability, which reduces the bad parts and accident. So the productivity and output will be increased. In addition, it is possible to economically produce product with small volume when designing dimension range and choosing steel grade.

The automatic wall thickness control system commands the operation of the stretch reducing mill by jointly using the process calculation method and automatic process control. It is mainly composed of process control system, inspection system and operation control system.

(1)Pipe End Control
(2)Process Design
(3)The diagnosis system in the automatic wall thickness system

The adjustable three-roll stand is a new product developed by the company and it is used as the finish rolling stand of the sizing(reducing) mill.

Adjust the roll gap within certain range according to the outer diameter variation of the steel pipe.
Compensate the gap according to the roll wear condition to ensure the precision of the outer diameter of the steel pipe.

Decrease the quantity of the spare roll and stand to a large extent, reduce roll wear and improve the equipment utilization ratio and flexibility.
The shape and dimension of the adjustable stand are same as the common ones, so it will not cause additional equipment modification costs.

This machine is used to process the roll groove of the sizing(reducing)mill. This lathe can turn three rolls on one stand at one time by fixing three ceramic cutters on the tool with fixed diameter. The tool slowly rotates at the rolling center and the lathe providesfeed through the rela- tive rotation of the roll.

The six-roll straightening machine, type 2-2-2, is manufactured with well-proved technology and is the most popular equipment in pipe straightening. The Straightening Precision of the Six-roll Straightening Machine Manufactured by us：
Pipe body<=0.75mm/1000mm
Pipe end<=1mm/1000mm