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811. Frequency analysis of chatter vibrations in tandem ...

backup roll is the most significant one. It is demonstrated that the upper backup roll and top housing are more sensitive to chatter than the work rolls and they are suitable locations for ... tandem mill unit of Mobarakeh Steel Company (MSC). Fig. 1 shows a view of this unit. Fig. 1.

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Back-up rolls | Sheffield Forgemasters International Ltd.

Tandem mill rolls can be produced up to a maximum weight of 60 tonnes. The maximum finished weight limit for plate mill rolls is 170 tonnes. Tandem mill back-up roll can be supplied with barrel hardness levels within the range 55 to 75 Shore C. Surface hardness is constant throughout the working life of the roll.

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mechanical engineering: Types of rolling mills

It is a special type of four high rolling mill in which each of the two working rolls is backup by two or more of the larger backup rolls for rolling hard in materials. It may be necessary to employ work rolls of a very small diameter but of considerable length. In such cases adequate of the working rolls can be obtained by using a cluster mill.

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Rolls-Forged Rolls-Backup Rolls - metals

Tandem Mill Back Up Roll Reversing Mill Back Up Roll : General Use : FB-7 : 5%Cr Steel : Tandem Mill Back Up Roll Reversing Mill Back Up Roll : High Hardness Deep Hardness penetration : NBR : Special Material : Continuous Tandem Mill Back Up Roll : Fatigue Resistance Wear Control : NBX : Special Material : Hot Strip Mill Back Up Roll for High ...

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The First Sendzimir Tandem Mill

The roll separating force on the 1-2-3-4 mill is distributed from the work rolls to the intermediate rolls and then to the backup shafts in such a fashion that the outer shaft takes a heavier force component, i.e., absorbs more load than the center shafts. The driven rolls in the mill are the outer second intermediate rolls.

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Facilities 5Stand Cold Reduction Mill - californiasteel

Each mill stand has two work rolls about two feet in diameter, which are driven by powerful electric motors (totaling over 25,000 horsepower) and sandwich the steel to reduce the thickness. In what is known as a '4-Hi' arrangement, two back-up rolls around 4-1/2 feet in diameter prevent the work rolls from being distorted by the 1000+ tons of

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Rolling Mill Backup Rolls Manufacturers and Suppliers ...

Equipped with one of the best back up roll brands, Kaida Roll Group is one of competitive skin pass mill roll, temper mill roll, tandem mill roll manufacturers and suppliers in China, welcome to visit our website. Forged steel back-up roll is mainly used in 4-Hi mill and 6-Hi mill. The diameter of roll .

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Rolling processes - Al-Mustansiriya University

Rolling processes 5-1 introduction: Rolling is the process of reducing the thickness or changing the cross section of a long workpiece by compressive forces applied through a set of rolls, as shown in figure (5-1). Fig. (5-1) Most rolling is carried out by hot working, called hot rolling, owing to the large amount of deformation required.

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US4658620A - Tandem mill - Google Patents

In the tandem mill comprising a plurality of stands according to the present invention, a suitable mill taken from the group consisting of the common bendable roll four-high mill N, the sliding sleeve mill A, the intermediate back-up roll shifting mill B, and the expandable sleeve mill .

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Backup roll contour of a SmartCrown tandem cold rolling mill

Enhancing the self-maintenance of the backup roll and the work roll After the FSR backup roll is used, the states of roll contact and roll wear are improved, and the contour of G.H. Yang et aL, Backup roll contour of a SmartCrown tandem cold rolling mill 361 the backup roll and the work roll in good self-maintenance is made, and the consumption ...

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Premature failure analysis of forged cold back-up roll in ...

A spalled sample from a forged back-up roll used in a 5 stand 4 Hi tandem mill was investigated. The chemical composition and detailed specifications of the forged back-up and work cold rolls are given in Table 1, Table 2, respectively.The sample was washed thoroughly with running distilled water, rinsed and ultrasonically degreased with acetone and dried.

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Failure Analysis of Rollers in mill stand using Failure ...

From a back-up roll in a continuous tandem mill", certain size, defects can be detected by ultrasonic Materials and Design 32 (2011) 4376–4384 inspection before delivery. [2] Wu Q, Sun DL, Liu CS, Li CG. Analysis of Inclusions: surface and sub-surface initiated spalling of The roll maker has to pay particular forged cold work rolls.

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white paperSuccessful Execution of Roll Cooling Strategies ...

Many argue that the back up roll acts as a large heat sink, but in reality the contact line between the backup roll and the work roll has a small area. Moreover, even if the backup roll picked up heat from the work roll, the reverse ... In a tandem cold mill, one generally only applies coolant on the entry side in

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Rolling Mill Rolls - For Steel Mills - Blooming And ...

Wholesale Trader of Rolling Mill Rolls - For Steel Mills - Blooming And Slabbing Rolls, Work Rolls For Hot Strip Roughing And Nonferrous Hot Rolling, Work Rolls For Cold Tandem, Reversing, Skin Pass Mills and Pinch Rollers For Continuous Casting And Bending Machines offered by Taisei International, Chennai, Tamil Nadu.

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Cold Rolling Mill Roll - Kaida Roll Group - kdroll

Roll selection for Cold Rolling mills. 1. Tandem Mill Rolls. Pic.1 Five Stands Tandem Mill Rolling Line

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Failure Analysis of Rollers in mill stand using Failure ...

From a back-up roll in a continuous tandem mill", certain size, defects can be detected by ultrasonic Materials and Design 32 (2011) 4376–4384 inspection before delivery. [2] Wu Q, Sun DL, Liu CS, Li CG. Analysis of Inclusions: surface and sub-surface initiated spalling of The roll maker has to pay particular forged cold work rolls.

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(PDF) Mathematical modelling of roll wear in a tandem mill ...

While the surfaces of the backup rolls are not in direct contact with the slab, the direct contact with the work roll generates a wear which is relatively small compared with the one caused on the work roll. Because of this, the backup rolls are run much longer than the work rolls, up to 28 days with short mill shutdowns for surface inspections.

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Genesis of spalling in tandem mill work-rolls: Some ...

Macroscopic investigations of spalled 3% Cr-variety forged steel work-rolls used in the tandem mill of an integrated steel plant showed steel strip welding on roll surfaces. Microstructural...

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Temper mill - Wikipedia

The mill stand can be work roll driven or back up roll driven. The mill can be designed with hydraulic work roll bending or back up roll bending. Installations typically have a single rolling mill stand, but may have two. Pinch rolls provide back tension for the pay off reel in the entry section and entry and exit tension for the temper pass.

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Tandem cold-mill solutions by Primetals Technologies

TANDEM COLD MILL Tandem cold-mill solutions from Primetals Technologies stand for high product yields combined with flexible production, low operational costs and simplified maintenance work. Depending on the product mix, the production capacity of continuous tandem mills from Primetals Technologies can exceed 1.2 million tons per year.

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Genesis of spalling in tandem mill work-rolls: Some ...

Macroscopic investigations of spalled 3% Cr-variety forged steel work-rolls used in the tandem mill of an integrated steel plant showed steel strip welding on roll surfaces. Microstructural...

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