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The microstructural features of prematurely spalled tandem mill work-rolls were examined in an attempt to correlate microstructure with spalling behavior and roll performance. Spalled samples were collected from work-rolls that had shown variations in roll life under similar conditions of mill usage. Optical microscopy revealed that a fine dispersion of spheroidal carbides in a …
In tandem cold mill (TCM), strip passes through individual pairs of work rolls. Each work roll is supported by a backup roll of a large diameter [2, 14]. In order to achieve good tension control, tensiometer is the reliable instrument to measure the tension between stands.
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.
Complete line projects include Coupled Pickling & Tandem Cold Strip Mill (PL-TCM) for POSCO Gwangyang Works and Bridle & Steering Unit line for POSCO VST STS SPL. Equipment supplied includes Leveler Roll Assembly for Steel Dangjin Works, Back Up Roll Assembly at JFE Steel Chiba Works, and Pinch Roll Assembly at Dongkuk Steel Dangjin Works.
China Bainite Roll catalog of Good Quality Factory Price Bainite Nodular Centrifugal Roll Cast Iron Roll, Forging and Casting for Back up Rolls, Heavy Duty Work Rolls for Rolling Mill provided by China manufacturer - Changzhou Senier Machinery and Technology Development Co., Ltd., page1.
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 ...
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.
EP2241382A4 - Rolling mill, and tandem rolling mill having the same - Google Patents Rolling mill, and tandem rolling mill having the same ... Back-up rolls; B21B13/145 ... Rolling mill with work roll shift function JP5711232B2 (en) * : : ...
The popular Sendzimir mill is a type of cluster mill with having 20 rolls. In all the mills having this configuration, there are only two rolls which are work rolls while all the other rolls are back-up rolls. Normally work rolls are driven and back-up rolls are friction driven.
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.
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 ...
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 …
What is Customized Cast Iron Roll/Forged Steel Roll/Work Roll/Backup Roll, mill roll manufacturers & suppliers on Video Channel of Made-in-China.
As a result the performance of back-up roll and thus availability of mill will be improved while specific costs for mill will drop. This quite ... Compared to the typical reduction of the strip in a tandem mill, the amount of reduction in skin pass process is quite low and commonly in the range of 0.1 to 1.5% (exceptionally up to 3%). ...
12. The tandem rolling mill of claim 11 including the smallest diameter backup roll having a diameter of about 85 to 90 percent of the largest diameter backup roll in said finishing train. 13. A tandem rolling mill comprising. a plurality of mill stands each having a pair of work rolls and a pair of associated backup rolls, and.
HSS is normally rolled in tandem cold mills (TCMs) that employ 4-high or 6-high rolling stands with work-roll diameters ranging from 630 mm to 420 mm. HSS exceeding 980 MPa has been manufactured by extending TCMs with the installation of an additional mill stand. However, the demand for steels with up to 1,500 MPa makes it almost impossible to ...
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.
A new FSR (flexible shape backup roll) was developed and applied in 1700 mm tandem cold rolling mills. A lot of good actual effects of FSR, such as evident improvement in profile and flatness of strips, non-occurring edge spalling, wear uniform, and remarkable decrease in roll consumption were validated by long-term industrial applications.
What is claimed is: 1. A tandem mill comprising a plurality of stands, characterized in that the final stand is a sleeve expanding mill, at least one of the stands exclusive of the last stand is a sleeve sliding mill or an intermediate back-up roll shifting mill, …
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.
Back Up Rolls for Hot Strip Mill. Rolls for Cluster Type & Sendzimir Mills. Forged Rolls. ... The current product range includes HSS rolls and super-HSS rolls for use in tandem mills that roll electrical steel sheet and other materials with high hardness for which there is strong demand as a result of factors such as the growing market for ...
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 ...
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
It is a unique sort of four high rolling mill in which each of the two working rolls is back-up by two or even more of the bigger backup rolls for rolling hard in products. It may be needed to employ work rolls of very little size however of significant size. In such cases, adequate working rolls can be obtained by using a collection mill.
Tandem cold metal rolling mill control deals primarily with a novel and practical advanced method for control of tandem cold metal rolling processes based on the recently emerging statedependent riccati equation technique. 3.6.3 process models for control of strip flatness 74. 3.6.4 flatness controller 76. 3.7 threading of the mill 78. 3.7.
Fig. 1. (a) The ring cut from the tandem mill back-up cold roll and (b) samples cut from the sector of the ring. 4378 H.R.B. Rad et al. / Materials and Design 32 (2011) 4376–4384 3.2. Microstructure microstructure. The microstructure of the samples in 55 mm and 70 mm depths from the roll surface comprised low percentage of Fig. 4 shows ...
Tandem: Tandem rolling mills are used for multiple pass rolling, combining two or more mill stands. Tandem mills are often used with turks heads, edgers, dancers, inter-stand tensiometers, payoff and take-up equipment. Horizontal: This type of a rolling mill is designed for the field of powered metallurgy, plastics and battery industries.
Based on comprehensive consideration of elastic and plastic deformation of both strip and work roll, an online rolling force model for tandem cold rolling mill has been developed by numerical integration method in this paper. According to the load equilibrium equation and the boundary condition, the vertical stress of every unit can be obtained. The rolling force in the plastic …
Due to the reversing rolling passes, production efficiency is lower than that of a tandem mill. However, because the rolling parameters can be quickly changed for each coil, reversing cold mills are especially suitable for the small-lot production of various product types. The size of the mill equipment is also smaller, which allows easier ...
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 observations of roll samples at regions away from strip-welded zones showed the desired uniform dispersion of fine globular carbides in tempered martensite. Quantitative image analysis of all …