What are the Failures of the Rolling Mill in Slitting Rolling?

What are the Failures of the Rolling Mill in Slitting Rolling?

In the slitting rolling of the rolling mill process, various bad phenomena often occur because of the misoperation, which directly affects the quality of the whole piece. Therefore, the corresponding preventive measures should be taken before rolling to ensure that the quality of the tied parts produced is the best.

During the whole rolling process, when the fastener leaks out in the high-temperature zone, it is very prone to burr. If it is in contact with the fastener or the temperature rises too fast, there will be the defect of sticking steel. At this time, if the tie piece and its contact, then there will certainly be a very serious situation of sticking steel. Now that the problem of failure has been listed, how should we prevent and solve it?

1. Strengthen the cooling of the discharging tool of the rolling mill so as to avoid sticking steel to the fastener due to high temperature.

2. Reduce the burr of the slitting box in slitting rolling and prevent the leakage of tied parts in the high-temperature area.

3. Periodically check the roll gap of the roll and the value of the roll gap of the slitting wheel, so as to effectively avoid the occurrence of sticking steel.

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

Direct Rolling Technology without Heating

Direct Rolling Technology without Heating

Direct rolling of continuous casting billet is that billet is heated by electromagnetic induction device at the opposite corner without reheating furnace, and then directly fed into the rolling mill for rolling. The technology of direct rolling without heating needs neither heating nor supplementary heating, which realizes an important innovation in the production process of bar and wire rod.

1. Technical Points:

1) Through the comprehensive control of cooling water flow, distribution and casting speed in the mold and secondary cooling zone, the continuous casting process is optimized and the slab temperature is increased.

2) Establishing the prediction model of solidification and temperature of continuous casting slab and the feedback control system of slab temperature, making the on-line prediction of the safe distance from solidification endpoint to slab cutting point, in order to prevent steel leakage accident.

3) Take measures such as increasing the speed of conveying roller, reducing waiting time and covering insulation cover to transport the cut-off slab from the continuous caster to the roughing mill quickly, so as to reduce the temperature loss of the slab and ensure the start-up temperature.

4) Optimizing the load distribution of roughing mill, improving the cooling rolling capacity of roughing mill, and avoiding the influence of overload of individual passes on the implementation of the heating-free rolling process.

2. The Main Advantages:

1) The reheating furnace is omitted to realize energy saving and emission reduction. Compared with conventional hot delivery, hot charging and cold charging furnace, energy saving per ton of steel can reach 20 kg and 40 kg standard coal respectively. According to the calculation of 2.6 tons of carbon dioxide and 8.5 kg of sulfur dioxide emissions per ton of standard coal, the production line of bar and wire rod with an annual output of 1 million tons can save more than 20,000 tons of standard coal every year, reduce more than 50,000 tons of carbon dioxide and reduce more than 8,500 tons of sulfur dioxide. The economic and environmental benefits are enormous.

2) The heating-free process avoids the slab staying in the heating furnace for a long time, reduces the burning loss, and improves the yield by 0.5-1.5%. According to the average value of 1%, the production line with an annual output of 1 million tons can save 10,000 tons of timber.

3) After exercising the heating-free process, the start-up temperature can be between 920 and 980 C, and the start-up rolling in this temperature range is conducive to improving the strength of the product. According to statistics, the yield strength of the product can be increased by 10-15 MPa after exercising the heating-free process, which is beneficial to avoid the appearance of Widmanstatten structure and improve the internal quality of the product.

4) In addition, the technology has the advantage of saving cooling water for continuous casting, reducing maintenance and operation cost of reheating furnace and avoiding overhaul and shutdown of the reheating furnace.

At present, China's bar and wire production capacity is seriously excessive, the whole industry has entered the era of marginal profits, energy-saving and environmental protection have become a hard indicator. Under the new normal conditions, direct rolling technology without heating can reduce costs, save energy and reduce emissions, which has positive significance.

More News You May Interesting:

The Main Rolling Processes of the Wire Rod Mill Production Line

Laying Head of Wire Rod Mill

Headless Welding Rolling Process

Bar Rolling Mills Water Cooling Technology

Continuous Casting Machine

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?

Cardan Shaft Assembly and Routine Maintenance

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

Bar Automatic Counting System

Rolling Mill Pass Design

Morgan Wire Rod Mill

Crank Type Flying Shear

Characteristics of Electric Arc Furnace Steelmaking

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

Hot Rolling Mill Rebar Mill (70,000 Tons/Year) for Sale

Hot Rolling Mill Rebar Mill (70,000 Tons/Year)  for Sale

We have following rebar rolling mill for sale



1.General specification

Product  capacity             70,000tons / year (13ømm case)

Products                     Rebar   10, 13,16, 19, 22ømm

Material                      Ship plate –mild steel

Equipment maker             Wooshin, Dongil, Daehwa, Hyundai–Korea

Mfg. date                     Oct. 2010



2.Specification of equipment

1).Reheating furnace         

Capacity                  15ton / hr.

Material : Steel scrap mainly from ship plate

  Type   Pin pushing type / 2 zone / BC oil

  Burner                    2 zone / BC oil / 1150℃

  Pusher                    Hydraulic pump

Recuperator

  Dust collector

  Caterpillar conveyor

Not available for dismantling.


2).Roughing mill - 9pass

  Motor                     AC 750kw / 3300v / 12P / 60hz. / Start resister

  Main reducer / 3-pinion / 3-Universal joint / 3high-stand x 2 sets / roll

Table                     Kant roll table

  Lubricant

3).Intermediate mill– 2pass

Motor                     AC 375kw / 3300v / 12P / 60hz. / Start resister

  Main reducer / 3-pinion / 3-universal joint / 3high-stand / roll

  Table                     Roll table / belt

  Lubricant

Flying shear               Cutting cap. - Max. 25mm x 2sets

4).Finishing mill– 4pass

  Motor                     DC 200kw / 440v / 60hz. x 4sets

  Main reducer / 2-pinion / 2-universal joint / 2 high-stand / roll x 4sets

Lubricant

5).Cooling bed

   Size                      45m x 6m

Type                     Working type

   Trough-4 / plate / run in roll table / kick off lever / state rack / moving rack / gathering conv.

           / take out device / run out roll table



6).Cold shear

  Type                       air C & B / down cut

  Knife                       400mm

Capacity                    300ton

7).Regular size handling system

   Traverser / chain conveyor / manual binding

8).Short size handling system

Traverser / chain conveyor / manual binding

9).Air compressor

10).Cooling water device

11).Electric panel & control desk

12).Shearing machine

    Cutting capacity             60t x 1,500Lmm

    Knife                       1,800 Wmm

Details will follow on request.


Free send inquiry to stella@hanrm.com if any needs.
Whatsapp/Wechat:+8615877652925
Website:  https://www.hanrm.com



More News You May Interesting:

Headless Welding Rolling Process

Bar Rolling Mills Water Cooling Technology

Continuous Casting Machine

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?

Cardan Shaft Assembly and Routine Maintenance

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

Bar Automatic Counting System

Rolling Mill Pass Design

Morgan Wire Rod Mill

Crank Type Flying Shear

Characteristics of Electric Arc Furnace Steelmaking

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

186,000 Tons/Year Rebar Mill for Sale

186,000 Tons/Year Rebar Mill for Sale

We have a rebar mill with 32 tons /hour capacity for sale.

Production Size: Bar (D10, D13, D16, D19)
Production capacity: 186,000 tons /year  ( heating furnace not available )
Billet  Size : Billet 120Aq, 125Aq,  Length: Max. 3m
Make: China manufacturer
Year Original manufacturing 2001
Revamped in 2014 and 2016

Scope of supply :
 Roughing mill ( 3 Hi /8 passes)
 Intermediate mill(2Hi/10 passes)
Finishing mill(2 HI /6 passes)
Cooling bed: 6.8 meters x 53 meter
Cutting machine: 3000 tons of capacity
Bar handling equipment

Reheating furnace is not included
Currently dismantled for reinstallation.


Free send inquiry to stella@hanrm.com if any needs.
Whatsapp/Wechat:+8615877652925
Website:  https://www.hanrm.com

More News You May Interesting:

Morgan Wire Rod Mill

Crank Type Flying Shear

Characteristics of Electric Arc Furnace Steelmaking

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

Headless Welding Rolling Process

Bar Rolling Mills Water Cooling Technology

Continuous Casting Machine

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?

Cardan Shaft Assembly and Routine Maintenance

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

Bar Automatic Counting System

Rolling Mill Pass Design

                       

Bar and Wire Rod Rolling Mill For Sale

Bar and Wire Rod Mill Production Line

50000-300000 tons of bar and wire rod mill production line, 8-32mm of full continuous rolling production line, is common carbon steel, excellent carbon structural steel and low alloy steel; the designed annual production capacity is 50000-300000 tons, and the large line speed of finishing mill is 5-16m / s.



1. Billets: 100 × 100 -- 150 × 150 continuous casting billets with a length of 3000mm -- 6000mm are provided by the internal steel-making and continuous casting workshop of the company.


2. A new regenerative pusher reheating furnace will be built for the whole continuous rolling mill production line. The fuel is blast furnace gas and the air will be preheated by single preheating. The hourly heating capacity is 40-80t / h, end in and side out, a single row of cloth, which can meet the requirements of 50000-300000 tons of rolling material per year. The inner chamber size of the reheating furnace is 6.6x24m.

3. 16 rolling mills are adopted, which are divided into roughing mill, intermediate mill and finishing mill, forming the whole continuous rolling production line, with the layout of 6 + 6 + 4 horizontal and vertical alternation, and the main drive of rolling mill is controlled by full digital PLC. Micro tension continuous rolling is adopted for rough rolling and medium rolling. There is one side looper in the middle of medium rolling and finishing rolling, and there is a vertical looper between each rolling mill of finishing the rolling unit, forming no tension and no torsion rolling. The high speed of the rolling mill can reach 5-16m / s.


4. Three flying shears are set on the rolling line, which is located behind the three units and is respectively used for cutting head, accident breaking and finished product multiple length sections. The structure of scissors is crank type, rotary type, and crank rotary combination.


5. Rolling process: round 6.5mm, threaded steel 8-32mm. The annual output of 50000-300000 tons of material requires 330000 tons of continuous casting slab, and the comprehensive yield is 98% (negative deviation is considered).

6. Controlled rolling water piercing cooling device is set in front of the finishing mill and a controlled cooling water piercing device is set behind the finishing mill to produce high-strength steel bars (grade III steel) and improve the mechanical properties of the products.



7. Semi-automatic packing equipment and 50t cold shear are used in the finishing collection area.



8. The control system adopts computer secondary control, which is divided into four areas (heating furnace area, rolling area, controlled cooling area, and finishing area), and each control point is controlled in a decentralized and centralized way.

Production Process and Product Structure

It adopts the international advanced equipment and advanced production technology: the heating furnace is a walking beam type, adopts the double regenerative high air temperature combustion technology of energy saving and environmental protection, and uses the blast furnace gas with low calorific value as fuel, which can greatly reduce the fuel consumption, with the characteristics of fast heating speed and good heating quality.



There are 18 rolling mills in the whole line. In order to ensure the dimensional accuracy of the products, 6 loopers are set in the finishing mill room, and the water-cooling device is set after finishing rolling, which can realize the torsion-free controlled rolling of the whole line. In the production of φ 10 ~ φ 16 threaded steel, three-section rolling is used; in the production of φ 18 ~ φ 22 threaded steel, two-section rolling technology is used. Among them, φ 22 two slitting rollings is a domestic innovation, and the family has this technology, and the slitting rolling capacity is at the first level in China. The main drive of the rolling line adopts the full digital control DC motor, which can realize the automatic operation of the whole line, and the large rolling speed can reach 18 m / s. The raw materials used are continuous casting billets, all supplied by hot delivery.

The main product specifications include national standard II, national standard III, British standard, Japanese standard, plus standard Φ 10 - Φ 40 straight thread steel and round steel of various specifications.


Production steel includes ordinary carbon structural steel, excellent carbon structural steel, low alloy steel, etc. All products are delivered in straight condition.


Please contact stella@hanrm.com for quotation.
And free send inquiry to us.
Whatsapp/Wechat:+8615877652925
Website: https://www.hanrm.com

More News You May Interesting:

Morgan Wire Rod Mill

Crank Type Flying Shear

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

Technological Features of Continuous Billet Cater

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?

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

Bar Automatic Counting System

Rolling Mill Pass Design

600,000 TPY Rebar Rolling Mill | Section Mill for Sale

Mini-Metallurgical Plant and 600,000 TPY Rebar Rolling Mill | Section Mill for Sale

The Minimill plant is composed of Melting & Refining shop

FastArc TM AC 70 t tapped steel

Ladle Furnace LF 70 t

Single-tank/single-cover VD/VOD station

FTP for EAF & LF primary and secondary fumes.

Melt shop auxiliary facilities

Continuous Casting Plant: 

3-strand Danieli FastCast TM billet continuous casting machine

Rolling Mill:

80-t/h (or 100-t/h in hot charge) Bar and Light Section Mill
70-ton Ladle Furnace (12/14 MVA transformer).
70 ton VD/VOD station, single-tank, single-cover type.
Raw material handling/charging system for EAF,LF and VD
Fume Treatment Plant for primary and secondary fumes for EAF and LF E C B

The Meltshop:

  A -Arc EAF 70-ton tap weight (64/74 MVA transformer), 5.3-m shell dia, equipped with the latest generation of wall-mounted oxygen/carbon injectors. The casting of specialty and stainless steel ingots

  B -70 ton Ladle Furnace (12/14 MVA transformer).
  C -70 ton VD/VOD station, single-tank, single-cover type.
  D - Raw material handling/charging system for EAF, LF, and VD
  E - -Fume Treatment Plant for primary and secondary fumes for EAF and LF
  F - 3-strand, 9-m-radius FastCast Continuous Casting Machine, for high-speed casting of 130x130, 150x150,180x180-mm quality billets. Direct connection to the rolling mill reheating furnace, for hot-charging operation

PLANT CAPACITY: 500,000 tpy in cold-charge mode(*) Up to 600,000 tpy, in hot-charge mode

STARTING MATERIAL: Billet 150 x 150 x 12,000 mm
                                               180 x 180 x 12,000 mm Weight 2,000 kg and 3,000 kg

STEEL GRADES: Low carbon, concrete reinforcing, low/medium alloy steels

FINISHED PRODUCT:  Rounds (RB) from 16 to 50 mm dia
Deformed Bars (DB) from 10 to 40 mm dia, 4- strand slitting on DB 10, 12 mm dia 2- strand slitting on DB 14, 16 and 18 mm dia

Squares from 14 to 40mm, Flats from 30x6 to 80x25mm; Angles(equal) from 30x3 to 50x7mm; C profiles form 4 to 5

FINISHING SPEED: Up to 12 m/s

 PRODUCT TOLERANCES: According to Local and International Standards

FINISHED PRODUCT SUPPLY: Straight Bar Bundles Length 6,000 to 12,000 mm Weight 1,000 to 5,000 Kg
 (*) Yearly capacity based on a 3 daily shifts working schedule

Reheating furnace: Walking Hearth type capacity 80 t/h (or 100 tph in hot charge)

Roughing Mill: 8 AC driven ESS compact cantilever stands 820/685/585 mm dia in H and V configuration

Intermediate Mill: 6 AC driven SHS housingless stands 475 mm dia in H and V configuration.

Finishing Mill: 6 AC driven SHS housingless stands 430 mm dia in H, V and H/V convertible configuration equipped with automatic quick-changing system
In-line QTB treatment for high tensile deformed bars

Cooling Bed: Rake type Dimensions 54 x 13m equipped with a water spray system

Finishing Services: CLS on-line start&stop Straightening and Cut-to-Length system (multistrand straightener and shear), bundling service, final tying and collecting services

DANIELI AUTOMATION fully integrated system for process technology and equipment control

Please contact stella@hanrm.com for quotation.
And free send inquiry to us.
Whatsapp/Wechat:+8615877652925
Website: https://www.hanrm.com





More News You May Interesting:

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

Morgan Wire Rod Mill

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

Continuous Rolling Mill

Continuous Rolling Mill

The main working principle of continuous rolling mill is that when the billet is heated and discharged from the furnace, the oxidized iron sheet is removed by high-pressure water, and then the billet is processed in a four-roll reversible roughing mill. Finally, the intermediate billet which we need and suitable for continuous rolling mill is rolled. In the process of billet opening, the vertical roll can effectively ensure the precise width of the steel plate and the intermediate billet. After shearing, it will directly enter the continuous rolling mill to wait for processing and can be rolled to the specifications required by customers at one time. After rolling, the coiler will take up the coil. In the process of rolling, the roughing and finishing mill needs high-pressure water for secondary dephosphorization.

Introduction of Four-roll Continuous Rolling Mill:

Main Uses: This kind of mill is a one-way and irreversible four-high cold rolling mill. It is mainly used for rolling stainless steel, aluminum, carbon steel, copper and zinc, and other metals.

Main Features and Structures: The main components of this rolling mill are reducer, motor, universal joint shaft, human gearbox, stand, pressing part, electronic control cabinet, and roll system. The roll system uses special bearings for continuous rolling mill. The material of roll is 9Cr2Mo. If it is a large mill bearing base, it will also have a roll changing device.

Selection of Raw Material in Steel Rolling Mill Production

Selection of Raw Material in Steel Rolling Mill Production

In steel rolling mill production, ingots, billets and continuous casting billets are commonly used as raw materials, and die casting billets are also used.

  

Material selection should pay attention to:

(1) Production and quality should be considered.

Choose appropriate billet size, reduce rolling passes as much as possible to increase production, while ensuring compression ratio.

(2) Considering the economic benefits and production possibilities, all consumption should be reduced.

Raw material preparation is mainly to check and clean up various surface defects (scarring, cracking, slag inclusion, folding, etc.) If not cleaned before rolling, rolling will continue to expand and cause more defects.

Cleaning methods:

Flame Cleaning: As for carbon steel, low alloy steel, metal consumption is large

Wind shovel cleaning: suitable for carbon steel, alloy steel, high carbon steel (alloy steel has poor thermal conductivity, easy to crack by direct flame cleaning, must be preheated)

Grinding Wheel Cleaning (Planing): Suitable for alloy steel, peeling, the high metal consumption

Why Does the Rolling Opportunity Fail to Roll?

Why does the rolling opportunity fail to roll?

In fact, the leakage of the rolling mill is quite common in the production process, which will have a serious impact on the normal rolling industry of enterprises. So, do you have a serious understanding of the factors of this kind of failure and the relevant solutions?


The basic conditions and factors of rolling mill leakage are the same. When the rolling mill is running, the rolled piece will certainly have a certain impact on the roll, which will lead to vibration and spring. In such cases, the rolled piece will pass through the mill directly and avoid contact with the rolls, which will lead to the leakage of rolling.


If this situation is persistent, then it is necessary to stop the rolling mill for maintenance and adjust the guide of the rolling mill. After research, it is concluded that if the rolling guide or closed mill is selected, this kind of failure can be effectively solved, and the effect is very good. If conditions permit, you can try it.

Hani Tech is a Hot Rolling Mill manufacturing company working mainly in the area of the bar and wire rod mills, high-speed wire rod mills, high-speed rebar rolling mills, TMT rolling mills, flying shear, cold strip rolling mill, reheating furnace, induction furnace, intermediate frequency furnace, electric arc furnace, ladle refining furnace, blast furnace, continuous casting machine. We can supply designing, manufacturing, installation, and commissioning for your requirements about rolling mill plant with a “turn-key” service.  Hani is the one-stop supplier able to design, manufacture, install and commission your hot rolling mill plant from A to Z. http://www.hanrm.com

If you are interesting, Pls contact me:
E-mail: Stella@hanrm.com 
Whatsapp/Wechat:+8615877652925
Website: https://www.hanrm.com