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The paper proposes an approach for thermal stress evaluation and fatigue life assessment of work rolls in hot rolling mills. Temperature and thermal stress distributions are calculated with a simplified finite element approach, based on a plane model of work roll loaded on its boundary by rotating thermal actions for a typical hot rolling configuration.
Aug 19, 2019· In hot rolling mills, premature failure of rolls is a major concern as it adversely affects the mill operation as well as production. Analysis of failed roll materials and actual rolling conditions in service are therefore necessary to understand the roll failure mechanism and thereby improve the service life of rolls. The hot strip mill referred here consists of two stands in a roughing 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.
PHYSICAL METALLURGY OF A HSS MATERIAL FOR HOT ROLLING MILL ROLLS Jacqueline LECOMTE-BECKERS 1 Jerome TCHOUFANG TCHUINDJANG 1 Eric PIRARD 2 Jean-Pierre BREYER 3 ABSTRACT High Speed Steel (HSS) cast rolls are used in front finishing stands of hot strip mills.
"Frequently Asked Questions about Hot Strip Mill Work Roll Surface" (wear, oxidation, firecracks, sticking and fiction) This was originally presented at the WMSP, New Orleans, 2004. Dr. Karl Heinrich Schroeder With British Rollmakers (China) Ltd. Keywords: rolls, wear, oxidation, firecracks, sticking, friction Abstract The roll surface is ...
Tangshan Iron and Steel Group Heavy Machinery Equipment Co., Ltd., is a professional company integrating smelting, casting, heat treatment and mechanical processing.Products cover full range of hot strip and plate mill rolls, section roll rings, bar and wire rolls.
Alibaba offers 2,376 hot strip mill work roll products. About 1% of these are steel round bars, 1% are adhesive tape. A wide variety of hot strip mill work roll options are available to you, There are 2,373 hot strip mill work roll suppliers, mainly located in Asia.
The Hot Rolling Process The primary function of the Hot Strip Mill is to reheat semi-finished steel slabs of steel nearly to their melting point, then roll them thinner and longer through 12 successive rolling mill stands driven by motors totaling 77,000 hp, and finally coiling up the lengthened steel sheet for transport to the next process.
Model development of work roll wear in hot strip mill . Ziying Liu 1, *, Yingping Guan 2 and Fengqin Wang 1. 1 Shougang Research Institute of Technology, Beijing 100043, China .
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
SMS DEMAG Hot Strip Mills 10 The drum-type shear installed between the roughing and finishing mills of a hot strip mill crops the trans-fer bar at its head and tail. In special applications, the drum-type shear also serves to divide transfer bars and finished plates. Based on the experience gained from more than 60 drum-type shears built so far,
The objective of this investigation was to determine the influence of work roll cooling on roll thermal behavior. The investigation has been conducted utilizing a previously developed computer model [1]. Three industrial operations were evaluated and features of an optimum configuration have been identified. The magnitude of the thermal zone near the roll surface within which the cyclic ...
May 11, 2005· Work roll changes account for a large proportion of downtime in the operation of hot strip mills, resulting in financial penalties for the mill operators in terms of lost production and roll .
Jan 28, 2009· The roll gap is set and then the strip is fed into the mill. Commercial mills will have screwdowns that exceed the rated RSF so that the gauge can be adjusted with the strip in the mill. If you really care, RSF can be calculated with fair accuracy. For hot rolling a material with a compressive plain strain yield strength of YS and a strip width ...
High Speed Steel Rolls. The microstructure consists of tempered bainitic / martensitic matrix with primary and secondary carbides. Primary carbides MC, M 7 C 3, M 6 C and M 2 C are originated during the eutectic solidification. Secondary carbides are precipitated during .
These backup rolls are larger and contact the back side of the smaller rolls. A four-high mill has four rolls, two small and two large. A cluster mill has more than 4 rolls, usually in three tiers. These types of mills are commonly used to hot roll wide plates, most cold rolling applications, and to roll foils.
In a four-high hot strip mill, the finishing mill of the hot strip mill is equipped with two work-rolls and two back-up rolls and is shown in Fig. 2. During the passage of the strip between the two work rolls, a large amount of roll separating force is developed.
In many hot strip mills the front stands of finishing group are working with rolls made in High Speed Steels. The success in using these rolls is strictly in connection with the mill technology but also with redressing methods applied in the turning shop. The HSS rolls show an impalpable wear and then the evaluation of roll surface
Mill Hot Strip Mill Work Roll and Back Up Roll Chock Bearing Design Improvements and Value Add Features. Glunt Industries was able to significantly lower the customer's maintenance spend and improve production uptime by adopting a Total Cost of Ownership philosophy to regularly maintain the assets, identify innovative means to redesign chock components and introduce new materials/coatings to ...
LUBRICATION ON WORK ROLL BEARINGS FOR THE HOT STRIP MILL QUAKERTEK™ CS 4015-EP THE SOLUTION CHALLENGES A large Steel Mill was currently using a grease on their hot strip mill bearings that was washing out. As a result the outside of the mill's roll chocks were polluted with grease, and the inside contained only a small amount.
A core product of Union Electric Åkers Thousands of Hot Strip Mill Work Rolls come off of our production lines each year, making Union Electric Åkers one of the world's largest roll manufacturers of Hot Strip Mill Work Rolls. All our Hot Strip Mill Work Rolls are made using the vertical centrifugal casting method, ensuring high in-service integrity and premium performance results.
innovations of work rolls in Hot Strip Mills have been focused on the application and the improvement of HSS (High Speed Steel) rolls. NSR has taken the initiative in the development of HSS materials and are proud that we are the world's leading manufacturer of HSS work rolls.
In hot rolling mills, premature failure of rolls is a major concern as it adversely affects the mill operation as well as production. Analysis of failed roll materials and actual rolling conditions in service are therefore necessary to understand the roll failure mechanism and thereby improve the wear resistance and extend the service life of rolls.
The mechanical rolling conditions in hot strip mills are precisely defined by various variables, which are taken directly froth the rolling schedule (separation force, torque. speed. strip thickness) or calculated from figures of the rolling schedule and dimensions of the mill (strip reduction, roll diameter etc.).
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