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As shown in the figure below, the rolls in a 4-high rolling mill are subjected to four kinds of deformation: (i) deflection of the back-up rolls, (ii) deflection of the work rolls, (iii) flattening of the work rolls caused by contact with the back-up rolls and workpiece and (iv) flattening of the back-up rolls caused by contact with the work rolls.
Camber. Camber tolerances are available closer than the published commercial range noted below upon request: For strip less than or equal to 1.5″ wide: .5 inches in 8 feet (less than or equal to 38mm: 13mm in 2.5m) Camber is measured by placing an 8 foot (2.5 meter) straight edge against the concave edge of the strip
Qty. 1 Second-hand 4-Hi reversing rolling mill – Electrical equipment and cooling unit are not included! Mfc. MINO Type: Built: 1970 Revamped: Strip width: 420 mm Thickness: Coil weight: 8.0 T Coil: Rolled material: Carbon steel (can be used for other applications too) General specification of the mill : Work roll dia. 170 mm Work roll face ...
4-High Rolling Mills. Four-high rolling mills can be put in tandem, two to seven stands, instead of a reversing mill. They can be equipped with load cells to tell the separating force and hydraulic or mechanical screw downs, depending if it is hot or cold rolling. Sometimes mechanical screw downs are preferred when there is a risk of fire.
The Cold Rolled Closed Annealed Coils and Sheets are manufactured using the cutting-edge Cold Rolling Mills at Vijayanagaar. With a 3.3 MTPA, the CRM facility offers state-of-the-art facilities, advanced operational technologies, a robust due diligence process and an integrated quality control mechanism.
A roughing mill is The financial support by the Christian Doppler Research Associa- tion, the Austrian Federal Ministry for Digital and Economic Affairs, the National Foundation for Research, Technology and Development, and voestalpine Stahl is gratefully acknowledged. electromechanical actuation edger roll plate work roll Fig. 1 ...
Conventional 4-high rolling mills are equipped with hydraulic systems that allow the bending of the rolls in order to adjust the strip's crown to the required profile. In the production environment, the bending set point is predetermined and defined during the pass schedule design [ 1 ].
The invention relates to the control of rolling mill backup roll eccentricity by combining the load carrying characteristics of rolling mill tapered roller bearing assemblies during rolling with prescribed levels of axial thrust to effect a controlled deflection of backup roll necks on a 4-high rolling mill or the like due to the selected thrust force applied axially to the ends or necks of ...
A two high mill with work roll diameter of 0.95m and 3.6m in length is selected to cold roll a strip of width 900mm with length of 0.5m and a thickness of 0.002m in a single pass. The dimensions of the roll shoulder are: Diameter 0.475m and length 0.2375m. The percentage reductions taken to study the variation in the roll deflection are 20%, 25 ...
The middle of roll becomes hotter than its ends and hence roll diameter in the middle of roll increases. In hot rolling mills this effect is quite pronounced and should be taken into account while calculating the roll camber. In cold rolling mills the coolant supply at different points on roll surface may be adjusted to minimize this effect.
Technical information about the six high mill Roughness Freq. Of roll Diameter (mm) Ra (micron) change Work roll 425 (max) 380 (min) 0.5 – 0.6 500 tonnes Intermediate rolls 490 (max) 440 (min) 0.6 – 0.7 1000 tonnes Back up rolls 1250 (max) 1050 (min) 0.6 – …
It is used to roll both ferrous and non-ferrous metals and is designed to make heavy reductions at high speeds. the roll cluster contains 12 rolls and 8 backing bearing assemblies. Four of the rolls are driven by intermediate rolls. Rigid, compact mill housing eliminates deflection of work rolls and produces a uniformly close gauge tolerance strip.
MACHINE: 13693 Manufacturer: Waterbury Farrel Co USA Type Mill: 4 High Non Reversing Rolling Mill Work Roll: 2" (50.8mm) diameter x 14" (356mm) wide Back Up Roll: North Branford, CT View Listing 3" (976.2mm) x 10.5" (267mm) x 10.5" (267mm) RUESCH 4 …
The invention relates to a method of and apparatus for removing excess longitudinal camber from MULT (multiple) strips (14, 18) cut from a rolled thin gauge steel sheet (12). Each cambered MULT strip is passed through a rolling mill (30) having rolls (32, 34) with strip-contacting surfaces (35, 33) which are vertically adjustable. One roll (32) is inclined relative to the other roll (34) …
As an integral part of a modern roll maintenance program, roll grinding and balancing uses machinery with accurate inspection and measurement equipment. This paper provides practical tips on roll inspections, balancing, grinding and grooving. In addition, we discuss proper roll handling during removal, storage, transport, and reinstallation.
In this paper, a mathematical model for a four-high mill is proposed to analyze the elastic deformation of its back-up and work rolls, including their respective axial deflections and surface flatness. The contact pressure between the back-up and work rolls and that between the work roll and foil are functions of the roll's position in the axial direction.
4.1 Mill Stand Components and Mechanisms 168 4.1.1 Rolling mill rolls 169 4.1.2 Roll neck bearings 186 4.1.3 Roll chocks 197 4.1.4 Mill housings 201 4.1.5 Mechanisms for roll adjustment and roll balance 205 4.1.6 Roll change device 217 4.1.7 Sendzimir cluster mills 220 4.1.8 Guides and repeaters 223 4.1.9 Guide tables and loopers 228
A camber shape at the surfaces of the backup and work rolls is designed to counteract the rolls' elastic deformation and to make the rolled foil as flat as possible. The effects of the selected roll materials upon the rolled thickness distribution are also discussed. A thickness variation within 1 μm can be obtained for a foil of 50-μm ...
A rolling mill includes an upper work roll 1 supported by an upper work roll chock 5, an upper backup roll 3 supported by an upper backup roll chock 5, for backing up the upper work roll 1, a lower work roll 2 supported by a lower work roll chock 6 and a lower backup roll 4 supported by a lower backup roll chock 7, for backing up the lower work ...
Normally elastic constant for mills may range from 1 to 4 GNm-1. Roll elastic deformation can result into uneven strip thickness across. Roll material is required to have high elastic modulus for reducing the roll deformation. For producing very thin gauge strips, small diameter rolls are used. They are supported with larger rolls.
ASPL has two 4-Hi Cold Reversing Mills with Automatic Gauge Control System, Work Roll Bending system. This process helps reduce thickness & simultaneously maintain the strips profile & flatness as well as shape & other dimensions under tolerance levels.
Cluster mill or Sendzimir mill stand – In this rolling mill stand, each of the work rolls is supported by two backing rolls. Cluster mill and Sendzimir mill are used for rolling thin strips of high strength materials and foils [0.0025 mm thick]. The work roll in these mills can be as small as 6 mm diameter – made of tungsten carbide.
So, I decided to use taper roll through one rolling campaign to study the change of strip crown, edge drop, strip flatness, work roll wear and so on. On the day of the 4th experiment (taper roll at F6 and the same EL and EH as 2nd and 3rd experiments) I stationed myself at finisher pulpit to provide direction to the finisher mill operators and ...
Our 4-High Cold Reduction Mill meets those higher tolerance requirements for improved product and tighter specs…like restricted gauge tolerance and tempers 1 through 5. With gauge ranges from .010" through 1/4" thickness and up to 8 1/2" wide, our cold roll and temper mill is …
By using the U-EDC work roll contour which was self-designed and used to edge drop control for the UCM cold rolling mill, a remarkable production …
camber for hi mill work roll - sqlconsultancy.nl. Camber For 4 Hi Mill Work Roll - wtcdeflandriensbe. auto camber roll grinding we have promote our auto camber work & back up roll grinder we are engaged in offering high grade auto camber roll grinding Get Price; facilities 5stand cold reduction mill csi's cold reduction mill is a series of five rolling mills, or in what is …
A new generation of levelers is equipped to meet today's demands to flatten the high-strength materials.used more prevalently in the automotive industry than ever. To tame the coil set, crossbow, twist, and edge camber in high-strength steel (HSS) coil, higher leveling forces and new concepts are needed.
Abstract. Shape control is always a key issue in the six-high rolling mill, in which the shifting of the intermediate roll and the work roll have been used to enhance the shape control capability ...
Two-High: Generally, a 2-HI mill is used for hot or cold breakdown and finishing of bar, sheet or strip. A wide range of sizes with separating force capacities from 10,000 lbs. (4.53 MT) to over 3,000,000 lbs. (1360 MT) are available. Three-High: A 3-HI mill is an economic milling solution for the breakdown of rod and ingot. Four-High: A 4-HI mill may be used for finish rolling of thin …
Gerdau Ouro Branco´s plate mill started the operation in 2016 with high level technology. In general, national and international plate markets are every day more ... Typical case of camber occurrence on the plate. ... Tests to check the mill mechanical conditions. 3.1 Work Roll crossover Test The Backup Rolls and work Rolls tend to