Technical Types of Endless Rolling of Bar and Wire Rolling Mill

Technical Types of Endless Rolling of Bar and Wire Rolling Mill

Headless rolling has a series of obvious advantages, such as high production efficiency, improving dimensional accuracy by reducing the loss of cutting head and tail to improve the yield, overcoming the dimensional deviation of the head and tail of the rolling piece, reducing the impact of the head and tail of the rolling piece on the motor, transmission system, roll, guide guard and reducing accidents. It is highly praised and researched by the steel rolling workers.

At present, there are two kinds of endless rolling technology for bar and wire rolling mill :

1. EWR Headless Rolling Technology

It is to cut off the slab first, then heat it, and then weld the front and back two billets (rolled pieces) end-to-end after the furnace is discharged, or after the roughing mill, so as to realize headless rolling. The technology of endless rolling by welding is called EWR, which was developed and first applied by Japanese manufacturers. China Tanggang, Xinggang, Bagang, etc. have tried it.

EWR headless rolling technology first cut off the slab which was originally headless and tailless, and then weld it into a workpiece that is headless and tailless. This is really a helpless move to solve the speed mismatch between the caster and the rolling mill.

This process not only enjoys many advantages of endless rolling but also brings a series of difficult problems. First of all, the complexity of welding equipment and the increase of accident points affect the operation rate in the early stage of commissioning. After short-term trial use, Tang steel, Ba steel, and other manufacturers gave up their efforts to further improve the technology and returned to the original single rolling operation mode, which affected other manufacturers' views on the EWR headless rolling process, which made the later ones flinch.

2. Luna Headless Rolling Process

One is Luna headless rolling developed by Danieli company in Italy, which has been applied in Udine company in Italy. It is characterized in that the billet caster and the continuous rolling mill are directly connected in a production line, the billet is not cut off, and the direct rolling is realized after induction heating in the tunnel furnace. After rolling, it is cut to a fixed length for cooling and subsequent treatment.

Compared with the EWR process, Luna's headless rolling process avoids the embarrassment of cutting and re-welding, which is a major technological innovation in the field of bar and wire rod production and represents the future development direction of rod and wire production technology. However, the disadvantage of the Luna process is that it still needs to use a longer tunnel furnace for induction heating, and its construction cost and operation cost are high.

Generally speaking, there is still a need for further research on the endless rolling technology of bar and wire rod rolling mill.

Please contact stella@hanrm.com for a quotation.
And free send inquiry to us.
Email: stella@hanrm.com   stellarollingmill@gmail.com
Whatsapp/Wechat:+8615877652925

More News You May Interesting:

Finishing Rolling Mill Process Explanation

Reasons and Solutions for the Piling of Wire Rod Rolling

Characteristics and Quality of Wire Rod

Morgan Wire Rod Mill

Why does the Steel Bar Bend after being Cut by Flying Shear?

Headless Welding Rolling Process

Bar Rolling Mills Water Cooling Technology

How to Improve the Thermal Efficiency of the Reheating Furnaces？

Causes of Surface Cracks in High-Speed Wire Rod Rolling Mill

What is Slit Rolling?

Failure Analysis of Cold Mill Roll

Causes and Solution of Steel Piling-up in High-speed Wire Rod Rolling Mills?

Bar Automatic Counting System

Rolling Mill Pass Design