hot strip grinding mill roll change

hot strip grinding mill roll change

Quick Roll-Changing in Steel Strip Production

Apr 16, 2012  Cleaning and grinding of pinch rolls can now be done offline which improves strip quality and increases working safety. Such hot-strip mills roll steel slabs up to 35 tons heavy into strips up to two meters wide and only one millimeter thick. The steel strip is still at temperatures of up to 600 degrees Celsius when coiling under tension ...

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Highest performing Hot Strip Mills Primetals Technologies

The demand for hot rolled strip is growing in multiple ways. To remain competitive, new and existing mills must meet this challenge in the best possible way. The production of hot strip is a key element of steel production. Since close to half of all steel produced is hot-rolled to strip, mills require maximum throughput and availability ...

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A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING

Secondary scale on hot strip and the impact on wear is another issue. Stresses from Hertzian pressure in 4-high cold mill back up rolls were measured years ago, the results were never published, but of high interest - also, maybe later. K. H. Schröder July 2003 K. H. Schröder: A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS

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Hot Rolling Mill - WaldrichSiegen

Whether in the conventional hot strip mill, the CSP facility or in the Steckel rolling mill – the grinding of work and backup rolls with or without in chocks is nowadays state-of-the-art technology for WaldrichSiegen grinding machines. Especially the turning of large workpieces in the machine requires tremendous center heights.

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Rolling of hot strip and strip defects – IspatGuru

Jan 14, 2017  For rolling of hot strip, the slabs are heated initially at 1100 deg C to 1300 deg C. The temperature in the last finishing stand of the hot strip mill varies from 700 deg C to 900 deg C. It is always to be above the upper critical temperature to produce uniform equiaxed ferrite grains.

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Work roll thermal expansion control in hot strip mill ...

Dec 01, 2008  The current model is compared and verified with work roll temperature measured for an actual rolling program in the hot strip mill at Mobarakeh Steel Complex. A variable header length for cooling system is suggested which can improve the quality of strip (shape and flatness) and also reduce the work roll damage caused by fire cracking for ...

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Rolling of steel in Hot Strip Mill – IspatGuru

Dec 03, 2015  Attributes imparted to the strip by the hot rolled strip mill include surface quality, thickness, width, and flatness control as well as strip profile. Rolling of steel slabs in hot strip mill consists of several sub-processes and at the end of them the final product ‘hot rolled coil’ is produced.

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Application of Portable Non-Destructive Testing ...

grinding. Roll life can be improved by efficient location and removal of cracks during grinding. The hot rolled strips in steel mills are produced normally with four high mills consisting of two work rolls and two back up rolls. The work rolls used in hot strip mills are usually of cast

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Design and function of CVC rolls as a flatness actuator in ...

blades. Outgoing thickness is around 0.10 mm. When the coil arrives to KV96 it has been hot rolled, cold rolled, intermediate annealed and in most cases grinded on the surface [2]. Flatness measuring – the flatness measuring roll On the exit side of the mill the strip is bent over a segmented roll, the flatness measuring roll.

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Fundamentals of Roll Cooling and Control of Flatness at ...

roll bite and in a typical Cold Tandem Mill, work roll temperatures normally fall in the range of 55oC – 70oC with strip recoil temperatures and inter-stand strip temperature rarely exceeding 160 oC depending on product. Roll Bite temperatures in slower heavily drafted stands can peak in the region of 300oC, diminishing with the

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Thermal Compensation of Work Roll Grinding in Hot Strip

36 Thermal Compensation of Work Roll Grinding in Hot Strip Mills work rolls were first measured before the grinding operation. After the uniform temperature distributions along the work roll axis were achieved, the measure-ments were carried out again to obtain the work roll profiles. 5. RESULTS The results of the experiments were used to iden-

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SMS group GmbH: CVC®plus for finishing mill stands

Our finishing mill stands are equipped with CVC ® plus - the world's most successful technology package for strip profile, contour, and flatness control. This explains why more than 450 hot mill stands worldwide operate with CVC ® plus technology today.. Here's what this technology can do for you: The system combines axial work roll shifting with special CVC ® grinding, a work roll bending ...

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Hot Rolling Oil for Steel Plants A Case Study

Hot Rolling Oil A is useful in improving productivity of the mill and life of rolls. Regular use of Hot Rolling Oil A at the six finishing stand of Hot Strip Mill has demonstrated achievement of following benefits: (a) Reduction in roll force and power by around 6-10%, helping in rolling of steels in critical sizes.

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HITACHI REVIEW --- December 1996 Vol.45-No.6

Currently in use at four hot strip mills in Japan, the Roll Shaping Machine has demonstrated its full capabilities for efficient, stable grinding and for highly accurate roll profile measurement. Confirmed user benefits include improvements in strip edge shape and surface quality, online correction of wear profile, and a reduction in the ...

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Control of Strip Tension in a Rolling Mill Based on ...

the resulting shape w 0 (x ) of the strip is used as a reference for subsequent calculations. Despite the synchronized mill speeds, the actual strip length l may slowly change over time due to the stretch of the strip caused by variations of F . To compute " and F , consider again the in nitesimal strip element d s shown in Fig. 3. Its length ...

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Design and function of CVC rolls as a flatness actuator in ...

blades. Outgoing thickness is around 0.10 mm. When the coil arrives to KV96 it has been hot rolled, cold rolled, intermediate annealed and in most cases grinded on the surface [2]. Flatness measuring – the flatness measuring roll On the exit side of the mill the strip is bent over a segmented roll, the flatness measuring roll.

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rolls for rolling mill - SlideShare

Feb 24, 2017  You can change your ad preferences anytime. Upcoming SlideShare ... Roughing work rolls for hot strip mills, vertical rolls, universal section mills ... As a result, the crack from hydrogen brittleness will take shape to add to the grinding even lead to the spalling. By adjusting the roll composition, Changzhou roll adopts special heat ...

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Some problems and experiences with roll grinding machines ...

A mill requires a high output from the roll grinding machines. In cold strip mills the rolls must be ground in the minimum time compatible with acceptable surface finish and geometry. The number of rolls ground is very important. REQUIREMENTS OF COLD ROLLING MILLS With work rolls in the mills strip of high quality must be rolled economically.

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Rolls of Rolling Mill Breakage Causes - Rolling Mills ...

Jun 21, 2019  Finally, in the actual rolling work, the roll will also bear a lot of loads. For example, in the rolling process, the rolls will be affected by the rolling pressure from the hydraulic device on both ends, the reaction force produced when the rolled piece is deformed, and also will bear the alternating load under the action of cold and hot.

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Geometrical analysis of end-face grinding with cup-shaped ...

The technology of on-line hot roll grinding (ORG, for short) is one of new technologies of hot strip mill appearing in recent years. It is distinctly for on-line roll grinding technology to increase quality of production and efficiency of producing, and save energy. Therefore, studying and applying ORG technologies is paid more attention to by iron and steel corporations.

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Roller Mill Maintenance00 - CPM

roller mill is operated with the rolls out of tram or out of parallel, significant thrust loads may be exerted on the rolls and bearings. In machines with straight bore bearings, the forces may be enough to cause the rolls to shift sideways in the machine, even contacting the mill frame.

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RENOLD AJAX MILL SPINDLE CATALOG (APRIL 2008)

Finished hot strip mill spindles Spindle Parts and Assembly 4. Main drive for large reversing mill ... without interfering with the roll change process. This system helps to reduce ... grinding decreases the case depth. As with induction hardening 4140, carburizing’s low tempering ...

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Steel Roll Forming Machine - Quality Hot Rolled Steel Coil ...

Mill Edge Hot Rolled Steel Coil A36Cr SS400Cr Q235B-Cr Q345B-Cr Steel Grade. Hot Rolled Steel Sheet. LR BV Hot Rolled Pickled And Oiled Steel Sheet Stainless Steel Sheet 304. Weather Resistant Hot Rolled Steel Sheet HRC Plate GB Equivelant Standard. Commercial 1500MM HR Hot Rolled Sheet Steel ASTM JIS Low Carbon. Hot Rolled Steel Plate

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CN101780474A - Hydraulic working roll bending device for ...

At present, in widely used 4-roller cold rolling mill, hydraulic working roll bending device is less than being equipped with, and like this, in the rolled strip process, normally comes rolled strip by the radian of artificial grinding working roll; Because the specification of rolled strip is more, the radian of pairing working roll is just ...

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Rolling of hot strip and strip defects – IspatGuru

Jan 14, 2017  For rolling of hot strip, the slabs are heated initially at 1100 deg C to 1300 deg C. The temperature in the last finishing stand of the hot strip mill varies from 700 deg C to 900 deg C. It is always to be above the upper critical temperature to produce uniform equiaxed ferrite grains.

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GRINDING WORKING ROLLS OF HOT ROLLING MILLS

equalize the temperature on the length of the roll barrel. It is possible to reduce the park of the working rolls for the account of their grinding in «hot» condition without the stage of cooling. For this it is necessary to take into account the thermal expansion which arises from the contact roll with the hot strip after each work campaign. 2.

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HOT ROLLING PRACTICE – An Attempted Recollection

These rolls can either be flat or grooved (contoured) for the hot rolling of rods or shapes. Under these conditions, the rolls grip the piece of metal and deliver it, reduced in cross-sectional area and therefore, increased in length. x The initial hot-working operation for most steel products is done on the primary roughing mill

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Analysis of On-Line Roll Grinding Technology for Hot Strip ...

Analysis of On-Line Roll Grinding Technology for Hot Strip Mill p.249. Research on Complex Ultrasonic Honing Acoustics System by Statistical Energy Analysis p.253. Modeling and Simulation of Virtual Grinding Machine p.259. The Technology of Laser Honing Applied in Distinctively Improving the Lubrication of Frictional Units ...

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PP Rolling Mills Mfg. Co. Pvt. Ltd. of Faridabad at METEC ...

Product category: Hot strip mills, Section mills, Bar and wire mills Housingless Mills High rigidity, reliability and quick roll change capabilities are the key features of the state of the art mill stands, which are designed for producing bars, wire rod, angles, channels, and universal beams.

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rolls for rolling mill - SlideShare

Feb 24, 2017  You can change your ad preferences anytime. Upcoming SlideShare ... Roughing work rolls for hot strip mills, vertical rolls, universal section mills ... As a result, the crack from hydrogen brittleness will take shape to add to the grinding even lead to the spalling. By adjusting the roll composition, Changzhou roll adopts special heat ...

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Chapter 4 Surface finish and friction in cold metal rolling

In practice both the roll and the strip surfaces are rough. In many rolling processes, the roll grinding process leads to a roll roughness with a pronounced lay, with asperities running along the rolling direction. This longitudinal roughness is in turn transferred to the strip. Isotropic roughness is also common, for example where the

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hot rolling mill rolls, hot rolling mill rolls Suppliers ...

About product and suppliers: 108,234 hot rolling mill rolls products are offered for sale by suppliers on Alibaba, of which rolling mill accounts for 4%, metal metallurgy machinery parts accounts for 1%, and grinding equipment accounts for 1%.

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A Review on Chatter Analysis in Cold Rolling process

2 Roll ripples/ Unbalance or eccentricity of rolls/ Speed of rolls 3 Periodic grinding of rolls ... 19 Chatter-affected strip entering the mill stand 20 ... Changes in the drafting schedule after work-roll change 3 To reduce fifth octave chatter (A)Critical material has to be scheduled as soon as possible after backup roll changes in the final ...

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Steel rolling mill chatter marks - Mechanical Acoustics ...

Jan 13, 2011  I have been asked to investigate "roll chatter" on a "skin pass" steel rolling mill used for final cold rolling of previously hot rolled, 1 mm thick material for car bodies. The mill has 2 work roll sizes (450 mm dia for 150 tons and 650 mm for 400 tons) and 2 backup rolls both 1100 mm dia. Each work roll has a gearbox and 750 KW motor driving it.

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United/clesim Hot Strip Mill (used) VX Machinery

F5 - 4HI UNITED Finishing mill stand 25" / 49" x 66" With pinion stand - direct driven, 1x 4000 Hp at 135 - 270 Rpm DC motors with reactance Roll grinders 28" CINCINNATI Roll grinding machine - max dia of rolls: 710 mm - max distance between peaks: 4270 mm - rotational motion of wheel: 25/30 hp - 600/800 rpm - head: 7,5 hp - 400/1600 rpm

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3M Abrasive Belts for Primary Metals Roll Grinding

Mill Rolls Hot cold rolling mills Temper mills (Carbon steel, aluminum) Work and backup rolls Leveler and handling rolls Example of Time Savings Roll: 25" dia x 80" face, cold mill work roll, 3% chrome Machine: 60" x 40" Mesta cylindrical grinder with CNC control Defect Removal or Rough Grinding Abrasive Results 3M™ Cloth Belt 966F,

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Geometrical analysis of end-face grinding with cup-shaped ...

The technology of on-line hot roll grinding (ORG, for short) is one of new technologies of hot strip mill appearing in recent years. It is distinctly for on-line roll grinding technology to increase quality of production and efficiency of producing, and save energy. Therefore, studying and applying ORG technologies is paid more attention to by iron and steel corporations.

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Sundwig S6-high cold rolling mill - ANDRITZ

The diameter of the S6-high work rolls is only approximately 30% of the diameter of the 4-high work rolls and double the diameter of those work rolls usually found in a 20-high rolling mill for comparable strip widths. These small work rolls combined with the rugged stand and open design of the lateral support facilitates high pass reduction ...

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