Cementer carbide ring roller

The cementer carbide ring roller widely applied in the production of highspeed wire,bar and deformed steel bar.

As far as the material for our cemented carbide roll rings , there are two series as Wc-Co and Wc-Co-NI-Cr which possess the good compre-hensive mechanical properties. The bending strength and impact toughness reach 2200 Mpa and ( 4-6)×106J m’2 respectvely. Its hardness and wear resistance come from tungsten carbide (We) while the toughness and strength depend on the bindingagent (Co-Ni-Cr).

Composite cemented carbide roll rings

Product name: Composite cemented carbide roll rings

Product Advantage: The primary rolingtonnageare 600-2000tons,which is 20-30 times more than that of common tool steelrolls.
Packing Details : Wooden box with fumigation or Wooden Fram
Delivery Details: 30~60 days or Based on the quantity
Shipping: Sea freight、Land freight、Air freight
Customization:
Customized logo(Min. Order 1 piece)
Customized packaging(Min. Order 1 piece)
Graphic customization(Min. Order 1 piece)
Checking report: Material Report、Hardness Report、UT/MT Report、Dimensions checking report、Mechanical Property Test Report

Manufacture drawing
Process schedule with ETD date
QC checking of each process
Checking report
Photos &videos of each process
ISO 9001 certificate
Warranty Time
The third party Checking

Cemented carbide roll rings Application

The cemented carbide roll rings widely applied in the production of high speed wire, bar and deformed steel bar.

At present, the finishing mill is genierally composed of 8-10 stands. Because of the big size of fracture surface of rolled part,the collar on the front stands of finishing mill may resist heavy duty and strong impact. Thus, the high hardness and good thermal fatigue resistance are the primary factors, which are prior to wear-resistance.While there is low load and impact for therear stands, we shall pay more attention to the wear-resistance and thermal fatigue resistance of roll rings.

Advantages of cemented carbide roll rings:

  • As far as the material for our cemented carbide roll rings, there are two series as Wc-Co and Wc-Co-Nl-Cr which possess the good compre-hensive mechanical properties. The bending strength and impact toughness reach 2200 Mpa and ( 4-6)×106 J/m2 respectvely. lts hardness and wear resistance come from tungsten carbide (Wc) while the toughness and strength depend on the bindingagent (Co-Ni-Cr).

  • HBW05 is a new type of material specially developed by our company for KOCKS rolling mill bar production line. The hardness of the roll surface is HSD84-89, the uniformity of the roll surface hardness: ≤3HSD, the hardness drop/mm: ≤2HSD. The hardness difference of 3 roller rings of the same hole type is less than or equal to 3HSD. Single grinding amount (reduction): ≤1 mm. The material has high wear resistance and impact toughness under thermal load, so the product has high wear resistance and impact toughness, no ring burst phenomenon, and low processing difficulty. Its steel passing capacity can reach 60-80% of the cemented carbide roller ring, the price is less than 50% of the alloy roller ring, and the frequency of slot changing can reach 2 shifts.

It can be seen from the metallographic photos that the metallographic structure of the Cementer carbide roll is much better than other materials in terms of the shape, quantity, size and distribution of carbides, as well as the matrix structure and grain size..

During the use of cemented carbide roll ring, under good cooling conditions, a thin and dense oxide film is formed on the surface of the roll body. This uniform, thin and dense oxide film can exist for a long time without falling off, so that the wear resistance of the high-speed steel roll is significantly improved.

  • Cemented carbide roll ring have good thermal stability, and the roll surface has high hardness and good wear resistance at rolling temperature.
  • The cemented carbide roll ring has good hardenability, and the hardness from the surface of the roll body to the inside of the working layer hardly decreases, thus ensuring that the roll has the same good wear resistance from the outside to the inside.

Cemented carbide roll ring Production Process

Product design→ Roll blank design→ Roll blank manufacturing→ Roll blank acceptance→ Annealing→ Rough turning→ Ultrasonic flaw detection→ High temperature quenching→ Low temperature tempering→ Ultrasonic flaw detection→ Finishing→ Ultrasonic flaw detection→ Roll body grinding→ Roll numbering→ Inspection→ Cleaning → Packing → Shipping → Warehousing → Inspection → Use and Maintenance → On-site Communication → Design Improvement.

As can be seen from the flow chart, roll manufacturing forms a closed-loop system from product design, production and manufacturing, use and maintenance, and improved design, and the quality of rolls is constantly improving.

Cemented carbide roll ring Production equipment

cemented carbide roll ring Testing standards

Design specifications and standards for manufacturing, quality control and inspection

The relevant standards of the roller ring are as follows:

  • Anti-rust packaging implements GB/T1504 and GB/T1503-2008 standards.
  • Sampling method of samples for chemical analysis of GB222 steel and allowable deviation of chemical composition of finished products
  • GB223 Chemical Analysis Methods of Steel and Alloy
  • GB/T13313 Roller Shore Hardness Test Method
  • GB/T1804 General Tolerances Tolerances of linear and angular dimensions without tolerances
  • GB/T1503-2008 National Standard for Cast Steel Rolls

    Testing regulations:

  1. Check the size and surface quality of each part one by one;
  2. Carry out ultrasonic flaw detection three times one by one;
  3. Carry out hardness test piece by piece;
  4. The depth of the hardened layer of the roll body is affected by the manufacturing process.
Caution of Application for cemented carbide roll rings

Before determining the grade of cemented carbide for every stand, we shall have a thorough understand about theirproperties so as to make the correct choice (Please refer to the Product manual).

The sleeve insertion and assmbly of cemented carbide roll rings shall be carried out in accordance with the requirementsof precision. There shall be appropriate space between the roll rings and axle or between the roll rings and sleeve. The fit is neither tight nor loose. You should check whether the roll rings contorms to the technological requirement and cleanthe mounting surface of roll rings, sleeve and axle before the installation. it is prohibited to beat the roll rings with hammeror other hard things while assemblying.

For YGH series medium or weak alkali water of PH>7.2
YGRFor YGR series or PH<7.2 weak acid water of PH>7.2
The content of solid particles in the water<15 milligram/L

lt is inevitable to find the microcrack on the rolling groove. The microcrack will gradually extend, stretch and deepen. The groove shall be repaired immediately while the depth of crack reaching 0.2-0.4mm. Otherwise, the crack will deepen quickly, which leads to a risk of broken roller. The range of normal yield is reguated as follows:

Stands of pre-finishing rolling mill: (3500-4000)tons

1-2 Stands of finishing rolling mill: (1800-2500)tons

3-4 Stands of finishing rolling mith(1800-2500)tons

5-6 Stands of finishing rolling mill: (1500-2000)tons

7-8 Stands of finishing rolling mill: (1500-2000)tons

9-10Stands of finishing rolling mill: (1200-1500)tons减

Stands for reducing diameters: (800-1200)tons

lt is normal to find the microcrack on the rolling groove. The groove shall be repaired immediately while the depth of crack reaching 0.2 mm. lt is necessary to prevent the roller from being broken. While repairing, we must ensure to remove the crack thoroughly. Otherwise, it will bring a potential risk to next rolling.It is difficult and inconvenient to check if the surface is polishing. To ensure the complete remove of microcrack, we can increase the grinding quantity. Under thenormal condition, the repair is controlled in the range of:

Roll rings for stands 9-10 of finishing rolling mill(0.4-0.6)mm
Roll rings for stands 1-8 of finishing roiling mill(0.7-1.2)mm
Roll rings for s~nds of pre-finishing rolling mill(1.2——2.0)mm

Relaed product

KOCKS- roller ring

Roll rings for high speed rolling of ribbed steel bars

Composite cemented carbide roll rings

Cemented carbide composite roll

We can provide characteristic service and differentiated products according to the different conditions of rolling mill.

Service Include

Our Clients Give The Best Feedback

@Steel A
Read More
Although the price of LMMGROUP is 1.22 times that of the current rolling stock, through this trial, the data shows that the amount of steel passing through is more than 1.3 times higher than the current rolling stock, and the rolling groove wear of the off-line rolling is better than the current rolling stock.
@Steel B
Read More
According to the trial situation, The average amount of steel passing through LMMGROUP rolling is about 50%-60% of the alloy rolling spoke. The processing difficulty of high-speed steel is low, and the processing cost is lower than that of the alloy rolling wheel.
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The production process and before leaving the factory, all performance indicators are strictly tested, and the professional QC team controls according to the process.

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