Aug 20, 2002nbsp018332Hot roll lubrication has been known about for a long time and the latest research has demonstrated the advantage and value of this method to mill owners and their customers. The key lies in the commitment and professional approach by all concerned parties to make this method work. Increasing the Competitiveness of Hot Rolling.
This would eventually result in reduced cost for each ton of rolled steel. Where hot roll lubrication is concerned, benefits like lower loads, reduced mill power consumption, higher output, fewer roll changes with less regrinds, and better strip surface finish can be realized along the way.
Such claims are supported by an increasing number of success stories, gaining considerable attention. Therefore, the initial step is to discuss the principles with a reliable supplier who can offer quantitative data on particular examples. After surveying the candidate mill thoroughly, the supplier can make certain proposals and estimates of potential benefits and costs.
Performance of the Grease in Roughing Stand at Hot Strip Mill The grease was tried out for lubrication of Work Roll Bearings of 4 stands of Roughing Mill R2 to R5 at Hot Strip Mill. Period of Trial 83 days. Observations Grease was tested for its pumpability with.
There are a few suppliers providing a trial on a single stand before agreeing to a larger installation. In such situations, ldquoportablerdquo equipment is installed and linked by experts. In association with the mill personnel, these experts will improve the trial to suit the rolling program and mill characteristics.
The viability of the principles can be confirmed by comparing both pre- and post-installation data. Furthermore, an analysis of the quantitative results will help establish whether a complete installation has to be made.
A one-month trial of Shell Fenella Hot Rolling oil was successfully carried out at a contemporary steel complex in India. During that trial, a 20 reduction of load, a 10 increase in work roll life, and a 15 reduction in power consumption were recorded. Since then, the customer has wished for a permanent installation on four of the six stands, and this request is currently being commissioned.
In addition, the confidence of the mill management that theory can be converted into practice has been fully justified and has served as an inspiration to the mill operators. The control system meant for the oil delivery equipment has been completely incorporated into the mill computers and currently works automatically based on the type of strip and its dimensions, and also several other applicable parameters.
At a previous installation in Western Europe, a 20 reduction in roll load was noticed, with a reduced power consumption of 10 to 38 based on the material being rolled. The concluding results were that, apart from the significant advantages, vibration during oil application was decreased, roll durability was increased, and environmental limits on airborne emissions were not surpassed.
The mill maintenance personnel and roll shop operators can also work together to regularly inspect the chocks and seals. Chocks are the mechanical housing that holds the bearings in place and allows for sealing at the end of each roll where lubricant comes in and most water washes out.
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.
Better lubrication, roll protection and low power consumption, the use of hot rolling oil is ever increasing in hot strip, structural and rail mills at least partially at few stands of the mill. The requirement and application of different plants were quite different. Hence, one oil may not be suitable for.
May 30, 2013nbsp018332Roll changing device This is a special device designed to attach to the neck of the roll to be removed or inserted into the rolling mills. Mill protection devices These are to ensure that the forces applied to the roll chocks are not of such a magnitude to fracture the roll necks or damage the housing Roll cooling and lubrication systems.
To improve hot-steel-strip rolling mill operations trial attempts at work roll surface lubrication have been made by various investigators throughout the world during the last decade.
Some European tests are briefly described. Most of the investigations have been somewhat inconclusive, possibly because they were not undertaken with sufficient determination. Even so, it is apparent that improved wear life of work rolls can be achieved together with a decrease in the extent of surface defects in the rolled product. There could be a side advantage in a reduction in power requirements of the main drive motors.
It has been suggested that it could be simpler and at least equally beneficial, to add a surface active agent to the roll cooling water, instead of applying oil to the roll surfaces.
Past studies reveal that roll lubrication can reduce the mill separating forcetorque5and the tertiary scale thickness.6. For a 4-high hot rolling mill, roll lubrication occurs in two zones, i.e., the contact zone between the work roll and backup roll and the deforming zone in the roll bite.
Feb 05, 2020nbsp018332Work rolls in the hot strip mill withstand extreme service conditions, especially when electrical steels are rolled, resulting in severe roll wear and fatigue. High-speed steel HSS work rolls and rolling lubrication are applied to the mill to improve roll wear and fatigue. Tests show that HSS work rolls manifest good performance in wear, fatigue and oxidation resistance during electrical steel hot rolling.
Hydraulic system for tandem cold mill amp pickling line Ternium - Mexico 2011 Brazil 1996 Hyfraulic and lubrication systems for hot rolling mill Trico Steel.
Cooling spray delivery systems in hot and cold rolling mills of various types. Coolant is used for multiple reasons 1 to cool rolls 2 to provide lubrication in.
Aug 20, 2002 Setting up a hot roll lubrication system for a particular mill takes time and dedication in order to optimise the many variables and tailor it for the.
Dynamic behavior between inserted oil flow and the friction coefficient is described.Lubrication dynamics are considered in a strip thickness feedforward controller.Adaptive estimation of uncertain material and lubrication parameters.Simulation scenarios with validated models demonstrate the accuracy of the controller.
Hot strip mills began to apply the roll lubrication technology. Past studies reveal that roll lubrication can reduce the mill separating forcetorque5 and the tertiary scale thickness.6 For a 4-high hot rolling mill, roll lubrication occurs in two zones, i.e., the contact zone between the work roll and backup roll and the deforming.
Lubrication dynamics are considered in a strip thickness feedforward controller.
Quaker Chemical Rolls Out Green Hot Mill Lubricants Noria news wires Quaker Chemical, a global leader in process chemicals, recently conducted studies on roll bite lubrication in hot strip mills which demonstrated how todays quotgreenerquot formulation techniques can reduce the carbon footprint of a mill.
Simulation scenarios with validated models demonstrate the accuracy of the controller.
DOI 10.1002srin.199605524 Corpus ID 137913072. Developments of work roll bite lubrication at SSAB tunnplat AB hot strip mill inproceedingsLagergren1996DevelopmentsOW, titleDevelopments of work roll bite lubrication at SSAB tunnplat AB hot strip mill.
P. Kucsera et al. Hot Rolling Mill HGC Thickness Control Improvement 98 Another way to determine the thermal expansion of the work roll is the modelling of the heat transfer between the work rolls and the strip. This depends on the roll speed, strip thickness, the properties of the strip, roll gap, contact time and cooling parameters.
Dec 22, 2013018332Main Features of a modern Hot Strip Mill The objective of a hot strip mill HSM is to reheat and roll thick slabs into thin strip with a wide range of thickness Because of its huge size and large investment a hot strip mill need to have a life time of several decad.
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