Technical Progress Of High Speed Wire Rod Rolling Mill

Technical Progress Of High Speed Wire Rod Rolling Mill

Technical progress of high-speed wire rod rolling mill as followings: 

1) Continuous, torsionless and high-speed rolling. Roughing rolling and intermediate rolling are arranged alternately, and pre-finishing rolling is installed in front of the finishing mill. The maximum final rolling speed is designed to reach 120 m/s. 

According to the latest production practice, the maximum rolling speed will be guaranteed according to different specifications of wire rods. For example, in 2010, Siemens Austria Steel United Corporation (Morgan Company was annexed by the company) designed and manufactured high-speed for Xuanhua Iron and Steel Company. The guaranteed final rolling speed of the wire rod rolling mill is small wire rod Φ5.5-7.5 mm | 112 m/s, Φ5mm | 105 m/s for medium and 85 m/s for small diameter 6 mm quenched threaded steel. 

Improving the finishing rolling speed of the wire rod mill is a systematic project. It involves not only the main rolling mill machinery and electrical equipment but also the number of finishing mills, the rack spacing, and the cooling system. It does not affect the mechanical properties of products because of the high finishing rolling speed and the high finishing rolling temperature. 

It also requires supporting equipment such as a spinning machine and flying shear to withstand the high-speed impact of wire rods. 

2) Adding reducing and sizing equipment to improve product accuracy and solve the temperature control problem in the wire rod finishing rolling process.

3) Increasing the cross-section of the feed billet can not only meet the need for an upstream continuous caster to improve the productivity and quality of the billet but also increase the coil weight and increase the productivity and yield of the wire rod rolling mill.

4) The qualified billet is heated and soaked directly into the heating furnace through the hot charging roller. The hot charging temperature can reach over 600 C, which improves the productivity of the heating furnace, reduces the energy consumption during billet heating and the loss of oxide scale during billet cooling and heating, and improves the metal yield.

5) Low-temperature rolling. The starting rolling temperature is controlled at 950 C. The stiffness of the mill stand and the capacity of the main motor can meet this requirement in order to achieve overall energy savings and reduce metal burning.

6) Controlled cooling and temperature rolling.

7) Single-pass system. All products (small 5.0-25mm) only need to change rollers on four reducing and sizing mills, and no rollers need to be changed for other mills, thus significantly improving the productivity and productivity.

8) The latest generation of spinning machines and winding stations. In the form of asymptotic bending, the ideal trajectory of wire moving in the spinning tube is given, so that the wear of the spinning tube can be reduced and the running stability can be achieved.

Bar & Wire Rod Rolling Mill Production Line Process Flow (Complete Version)

Bar & Wire Rod Rolling Mill Production Line Process Flow (Complete Version)

1. Bar Rolling Mill Production Line Process Flow 

Billet acceptance → reheating → rolling →double length shear → cooling → shear → inspection → packaging → metering → warehousing

2. Process Flow of Wire Pod Production

Billet acceptance → reheating →rolling → laying head → bulk coil cooling → coil collection → coil pressing → inspection → packaging → metering → warehousing

The process of acceptance, reheating and rolling of billet in wire rod production is basically the same as that of bar mill production, but the cooling of wire rod is carried out by the scattered cooling roller. The cooled bulk wires need to be collected into discs by the coiler and then compacted by the coiler and packed in small discs. Then the inspection classification is packed into large bales and measured in storage.

3. Analysis and Treatment of Bar and Wire Rod Production Process Fault

Can not rolling

1. Causes: 

1.Rolled piece rotten head, split head, black head, etc. 

2. Improper or too small installation of inlet guide; 

3.There are sticky iron or foreign bodies in the inlet guide; 

4. The roll over angle is too large or too small; 

5.Rolling guide wheel does not rotate or bearing burns out; 

6.Roll does not turn due to breakage or connection; 

7.Improper adjustment of roll gap or unsatisfactory size of incoming material; 

8. Roll pass friction coefficient is too small (new pass), etc.

2. Analysis and Treatment and Preventive Measures

(1) Analyse the reason why the rolled piece is not in progress, strengthen the inspection of the head defect of the rolled piece and dispose of it in time;

(2) After installation of the inlet guide, measure the width and dimension of the inlet cavity with the internal caliper; Illuminate with light and check whether the inlet guide is centered on the hole pattern from the outlet direction and tighten the guide bolts;

(3) Check and measure the solid size of the rolled piece with calipers to ensure the correct size of incoming material;

(4) Roll gap size is strictly adjusted according to rolling requirements;

(5) Check rolling guide wheel and twist outlet frequently and replace in time; Check import guide regularly for sticking of iron night and depositing of iron oxide scale or debris;

(6) New hole pattern shall be tested with small material first.

Rolling Heap Failure

Steel heap failure refers to stagnation after accumulation of rolled pieces between rolling mills or rolling mills, which is called steel heap failure.

1. Causes

A. The size and section area of incoming roll are too large; The rolled piece itself has surface or internal quality defects.

B. The friction coefficient of roll pass is not enough, causing slippage of the rolled piece;

C. Volume flow per second of incoming mill is greater than that of receiving mill.

D. Electrical control system is wrong or out of control.

E. Installation of mechanical running part or photoelectric control instrument of automatic looper system is wrong, out of control or out of function.

2. Analysis and Treatment and Preventive Measures

A. Adjust the size and area of incoming material to satisfy the reasonable continuous rolling constant relation;

B. Monitor the running condition of the rolled piece dynamically and tightly and adjust it in time;

C. Ensure the quality of the ingot; Disposal of semi-finished rolled parts with quality defects in time;

D. Check the rotational speed, looper system and electrical control system of each rolling mill regularly to ensure the stable and normal running equipment and electrical control system.

Steel Pulling Failure of Rolled Parts

Steel pulling failure refers to the phenomenon that the rolled pieces are too tight or broken between rolling mills or rolling mills, which is called steel pulling failure. Due to the failure of steel drawing, the dimension of the rolled piece often changes, and even the shape dimension or roundness of the finished product is out of tolerance, causing scrap.

1. Causes

A. The size and section area of incoming roll are too small;

B. Volume flow per second of incoming mill is less than that of receiving mill.

C. Electrical control system is wrong or out of control.

2. Analysis and Treatment and Preventive Measures

A. Adjust the size and area of incoming material to satisfy the reasonable continuous rolling constant relation.

B. Ensure that the electrical and electronic control equipment systems work properly.

Since 1989 Hani Tech has been always involved in design, engineering, manufacturing and installation of complete hot rolling mill plant for long products (re-bars, SBQ bars, wire rod, small and medium sections), as well as revamping and upgrading of existing plants. 

Hani Tech is the one-stop manufacturer & supplier able to design, manufacture, install and commission your hot rolling mill plant from A to Z.

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