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, and the other stands are common four-high mills.
A tandem rolling mill is operated such that roll stands of an upstream stage of the mill adjacent to a strip inlet thereof are positioned relative to each other to effect a strip crown control or an edge drop control, while roll stands of a downstream stage of the mill adjacent to a strip outlet thereof are operated to axially shift the downstream stage work rolls cyclically to distribute roll ...
Tandem cold rolling mills are named by their stand arrangement and designed as "sheet mills" if they reduce hot band to sheet gauge or "tin mills" if they roll the same incoming material to tinplate stock. A typical five stand tandem cold rolling mill is illustrated in Figure 1. Figure 1: A typical five stand tandem cold rolling mill
trollers for the tandem hot and cold metal strip rolling processes. The tandem rolling of hot metal strip (Figure 1) is a major manufacturing process in which hot metal bars are reduced in thickness by being compressed in a series of mill stands. Each stand con-sists of a pair of independently driven work rolls supported by backup rolls of
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.
The main types of mills: back-up roll of 650mm Mill, 900mm Mill, 1050mm Mill, 1250mm Mill, 1450mm Mill. BIEC BACKUP ROLLS ARE USED IN 4 HI and 6 HI REVERSING AND TANDEM MILLS FOR ALL PRODUCT ROLLING SUCH AS STEEL, STAINLESS, ALUMINUM,BRASS, COPPER UPTO SINGLE PC WEIGHING 32000 KGS . Main technical parameters
SmartCrown was a new system developed by VAI for improving the strip profile and flatness control first applied in 1700 mm tandem cold rolling mills at Wuhan Iron & Steel (Group) Corporation (WISCO). After tracing and testing, the application of the conventional crown backup roll matching the SmartCrown work roll of the production mill led to heavy and nonuniform wear, and the edge spalling of ...
tandem mill back up rolls Automatic rolling mill history of tandem rolling mill for Tandem rolling mills benefits The insertion of this new kind of machinery brings countless benefits compared to the old system Production One of the most interesting aspects is the reduction of production time with train of rolls is possible more wire .
Based on the fact that the backup roll for 2250 CVC tandem mill in hot rolling has serious and non-uniform wear, and the edge spalling often happens, a new backup roll contour named CVR (CVC-VCR ...
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 ...
FH-11. 3% Cr Steel. Tandem Mill Work Roll. Reversing Mill Work Roll. Skinpass Mill Work Roll. General Use. FH-15. 5% CR Steel. Tandem Mill Work Roll.
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.
Our products are cast iron rolls, tungsten carbide rolls and forged rolls. They are used in High Speed Wire Rod Mills, Bar Mills, Pipe Mills, Cold Rolling Mills and Tandem Rolling Mills. +86 21 684 03198
Aluminum Mill Rolls: Same As Cold Mill Rolls: Cold Mill Back Up Rolls : WAA36-J5-B35: Cold Mill Work Rolls (Tandem) First Stand : WAA36-J5-B35: Other Stands: SA60-J1200-BCFS1: Cold Mill Work Rolls (Temper) Final Stand: C150-N-ES: Other Stands : SA60-J1200-BCFS1: Hot Mill Back Up Rolls; Forged Steel on Iron Core: 8BAC362-L7-B34 8BAC362-M900-B34 ...
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%). ...
If a mill rolls 80 % of the calendar year, that is 365 x 24 x 0.80 = 7008 hours. If the mill rolls 800,000 tons per year, it runs at an average production rate of 114.16 tons/hour. If the ...
proper roll cooling, the required thermal roll crown can be controlled in way to influence the overall roll profile. It is common practice adjusting the roll cooling to the strip width being rolled. Roll cooling is hence an actuator to allow stable rolling conditions of the mill. This is particular true for strip tandem rolling mills with regard to
Premature failure analysis of forged cold back-up roll in. · 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. Chat Online.
Modifi cation Method of Back-up Roll Bearing by Replacing ... for Rolling Mill Back-up Rolls ... In Fig. 10, the rolling bearings installed on the back-up rolls of tandem cold mills are plotted on the figure
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 ...
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.
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 9Cr2Mo, 86CrMoV7 ...
Forged Steel Rolls (Manufactured in Europe) Z-Mill*/ Z-Mill High**/ Cluster Mill ® (Registered Trademarks *Waterbury Farrel Corp & **T.Sendzimir Corp) Narrow Strip Mill Work Rolls Tandem Mill Work Rolls Intermediate Rolls. Back-Up Rolls. Cast Rolls (Manufactured in Japan) Bar Mill (SIP heat treatment to improve performance; deep hardened HSS)
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.
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.
Modifi cation Method of Back-up Roll Bearing by Replacing ... for Rolling Mill Back-up Rolls ... In Fig. 10, the rolling bearings installed on the back-up rolls of tandem cold mills are plotted on the figure
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.
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.
coupled pickling line & tandem cold mill High-capacity production of high-quality products For a wide range of products, the required strip thickness, flatness and surface quality can be achieved more economically by linking the pickling and cold-rolling processes.
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.
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