قائمة الطعام
For rolling hard thin materials, it may be necessary to employ work rolls of very small diameter but of considerable lenght . In such cases adequate support of the working rolls can be obtained by using a cluster-mill. v) Planetary Rolling Mill :-In this type of rolling mill, a large backup roller is surrounded by many planetary working rolls ...
Our range includes work rolls and back up rolls for hot roughing, reversing, and tandem rolls, cold breakdown rolls, finishing rolls, and foil rolls. Aluminum mill rolls are manufactured at our facilities in the US and Slovenia. Main Roll Grades . The following table gives a general overview of our main grades in this product segment.
A Tandem rolling mill is a Rolling mill with 2 or more close-coupled Stands, each of which is Setup for rolling by using its Spring Curve and the Compressive Curve of the metal; so that both the Rolling Force and the exit thickness of each Stand are determined.
This rolling mill comprises work rolls 1 and 1', back-up rolls 2 and . ... Tandem mill system and work roll crossing mill US4261190A (en) : Flatness control in hot strip mill US7251978B2 (en) : Roll stand for producing plane roll strips having a desired strip profile superelevation ...
a b s t r a c t In this paper, premature failure of a forged back-up roll from a continuous tandem mill was investigated. Microstructural evolutions of the spalled specimen and surface of the roll ...
Generally the initial operating temperature of the back-up roll in continuous tandem mill is between 90 and 110 °C. However, it decreases significantly to about 55 °C by continuous cooling liquid (spray) of water and oil during the milling campaign.
Rolling mill consisting of four rolls or known as a 4 High rolling mill is used for reducing material to extremely small thicknesses. Through the use of larger backup rolls, the issues of roll deflection can be avoided and smaller work rolls can be used.
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.
3%Cr Steel. 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.
> In a four high rolling mill, the diameter of backing up rolls is _____ the diameter of working rolls. Workshop technology Question: In a four high rolling mill, the diameter of backing up rolls is ________ the diameter of working rolls.
Sourcing Guide for Backup Roll: China manufacturing industries are full of strong and consistent exporters. We are here to bring together China factories that supply manufacturing systems and machinery that are used by processing industries including …
The above rolls are of following applications-•Hot & cold mills Back-Up rolls •Continuous & Semi-Continuous hot strip mills Back-Up rolls •Roughing 4-High stands Back-Up rolls •Cold tandem mills Back-Up rolls •Thick plate mill Back-Up rolls These rolls are characterized by the following properties : •Higher hardness penetration
Forged Steel Rolls. Lehigh Heavy Forge produces a full range of forged work rolls, back-up rolls, and specialty rolls for ferrous and nonferrous rolling mills. Our forged rolls are unsurpassed in strength and reliability. No matter the application, Lehigh Heavy Forge manufactures forged steel rolls to your exact metallurgical and dimensional ...
Further thickness reductions may follow on a tandem cold rolling mill. A tandem rolling mill typically consists of 3 to 8 mill stands that have to be synchronized by control. Fig. 1 outlines the tandem hot strip rolling mill considered in this work. Each of its four-height mill stands features 2 work rolls and 2 backup rolls, which minimize ...
The strip is rolled in several passes either in a reversing mill or in a tandem mill. Each work roll is supported by a backup roll of larger diameter. As the strip passes through the pairs of work rolls in each pass, the thickness is successively reduced.
The larger rolls are called backup rolls. The smaller rolls are the working rolls, but if they would be thicker in the centre and thinner at either end. Backup rolls hold the working rolls and restrict deflection when the material is being rolled. The usual products of these mills are hot and cold plates and sheets. ... Tandem or Continuous Mill.
Tandem mill installed in 1970. D stand delivery end of 44 tandem breakdown mill. Work rolls and backup rolls from 43, and 44 mills await dressing in a roll grinder. Betts-Bridgeford roll grinding lathe, installed in 1980-1981. Machinist Tom Shultz measures roll with a micrometer prior to grinding. Annealing
Hydrodynamic roll-neck bearings from SMS group are highly advanced and elementary components of modern rolling mill technology. That's because they support the load-bearing backup rolls. Even under extremely tough operating conditions, they ensure long roll service life and minimal maintenance outlay.
Backup Roll. The back up roll is a roll that supports the work roll and is the largest and heaviest roll used in rolling mills.The roll can support intermediate roll for the purpose of avoiding deflection of the work roll and affect on the yield and quality of the plate and strip rolling mill.The quality characteristics of the backup roll are high surface hardness, good hardness uniformity …
Working Layer Composition. Hardening Depth mm. Roller Application. 3%Cr Series. ≥880. 50-65. Martensite (bainite) + Carbide. 40-60. Single stand mill, Cold & Hot rolling tandem mill.
A rolling mill stand is represented by a mass-spring sys-tem with five degree of freedom to calculate the vertical vi-bration, as shown in Fig. 3. It consists of five mass ele-ments, corresponding to the top and bottom work rolls, the top and bottom backup rolls and the housing. The elastic deformation behaviour of the rolls is represented by ...
Forged Steel Back Up Roll Definition. The forged back up roll is a mill roll that supports the work roll and intermediate roll for the purpose of avoiding deflection of the work roll and affecting on the yield and quality of the plate and strip rolling mill. This is the key function of back up roll to ensure the operation of the whole rolling mill. The common materials are …
Many mill rolls manufacturers provide quality tandem rolling mills to various industries. 5.Cluster Rolling Mills Cluster Rolling Mills is a first four high rolling mills, where each of the working rolls is backed up by two or more larger rolls for rolling hard material.
Tandem mills can be either hot or cold rolling mill types. Some tandem rolling mills include backup rolls that provide rigid support to the work rolls and therefore allow the diameter of the work rolls to be reduced. Tandem rolling mills have a variety of configurations and can be two-high, three-high, four-high, six-high and so forth.
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.
In order to analyze the influence of technical parameters on work roll axial force of four-high continuous variable crown (CVC) mill, the deformation analyzing model with top roll system and strip was established based on influence function method. Then a CVC work roll curve designing scheme was proposed and it was carried out on some cold rolling mill considering the …
The top and bottom rolls work in the opposite direction. The two in the middle are smaller than the top and bottom rolls, which are also known as backup rolls. 4. Tandem Rolling Mills. The Tandem Rolling Mills comprises of a set of two or three strands of roll set in parallel alignment.
DSR backup roll technology … upgrade of rolling mill to cold roll Aluminum strip to … Redstone Machinery LLC Coil Weight: 27 MT (60,000 lbs.); Work Roll …
This is the key function of back up roll to ensure the operation of the whole rolling mill. The common materials are 9Cr2Mo, 86CrMoV7, 70Cr3Mo with 0.80% to 0.95% carbon content 2% Cr content. The diameter of roll …
These backup rolls are larger and contact the back side of the smaller rolls. A 4-high mill has four rolls, two small and two large. A cluster mill has more than 4 rolls, usually in three tiers. A tandem mill is a special type of rolling mill where rolling is done in one pass. In a traditional rolling mill rolling is done in several passes, but ...
حقوق النشر ©2000- 2024 شركة شنغهاي زينيث
