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With a reasonably fine mesh and a first order upwinding scheme, very accurate results of heat transfer behavior of a two-dimensional rotating roll could be achieved by using the finite difference method. The thickness-proportional coefficient Q has been found to be affected by Biot number. The first working position provides the axes of the two rollers 5 arranged on corresponding planes perpendicular to the strip pass line and appropriately reciprocally spaced so as to divert the head of the strip towards the corresponding winder 6. This condition causes load concentrations on small areas of the bearings and the bearing faces resulting in overloading conditions. In calculating the temperature distribution of work roll associated with thermal crown calculation, Roberts [30] introduced Ueda's calculation in which an equivalent condition to simulate the real roll condition was employed. When the crossed-roll condition becomes exaggerated, there may in fact be an adverse affect to the quality product as well as to the life of the rolls, bearings and chocks. The lead-in table is positioned at a predetermined distance from the pass line and may preferably vary from 15 to mm.
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US4290289A - Spacial alignment method for rolling mill rolls and chocks - Google Patents

Poplawski and Seccombe [18] extended the Parke and Baker model to include a third dimension. The heat transfer equation was solved by the numerical finite difference method, the Alternating Direction Implicit ADI method. However it can cause large difference in the roll core and surface temperature. Therefore from the stand point of industrial rolling it is essential that the effect of roll cooling on roll thermal crown is properly simulated. Jobs International Jobs Walk-in Jobs. However, such prior alignment practices have assumed that a single measurement taken between the axis of rotation of the roll and the lateral supportive face of the chock is sufficient to determine the spacial orientation of the latter face. Thus h is increased with increasing water flow rate, resulting in a larger amount of heat extraction from the roll.
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Cold rolling mill

This would cause a change in 8. The thermal field approaches a steady state. Such a device 8 comprises a lead-in table adapted to create a mechanical lead-in for the head of the moving strip. When this has been accomplished, the operator is ensured of a line of sight which is substantially parallel to but removed from the rolls axis of rotation. A number of operating factors influence the thermal crowns of work rolls. I further agree that permission for extensive copying of this thesis for scholarly purposes may be granted by the head of my department or by his or her representatives. The overall system is based on the integration of various functional components which can be applied individually to a partial upgrade situation or supplied as a complete system for a new operating environment.
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Side containment guides 12 of the strip may also be provided between the roller tables 4 and the corresponding upper lead-in and containment devices 8 FIG. Republic Steel; Republic Steel Corp. Edit Article Add New Article. Some solutions for attempting to minimize and control the aforesaid problems belong to the known art. Said tables 7 are fixed at the ends of a side structure of the guiding system. The decrease could be due to two reasons: The twelve cooling zones have been illustrated in Fig.
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